day02

Reviewed-on: #1

.gitignore

@@ -0,0 +1,3 @@
+2024
+2023/*
+

2022/go/day12/day12.go

@@ -0,0 +1,103 @@
+package day12
+
+import (
+	"fmt"
+	"strings"
+	"adventofcode2022/utils"
+	"adventofcode2022/utils/grid2d"
+)
+
+type cell struct {
+	height   int
+	distance int
+}
+
+type coord struct {
+	x int
+	y int
+}
+
+func Part1(input string) int {
+	startCoord, grid := parseInput(input)
+	fillGrid(grid)
+	printGrid(grid)
+	c := grid.Get(startCoord.x, startCoord.y)
+	return c.distance
+}
+
+func Part2(input string) int {
+	_, grid := parseInput(input)
+	fillGrid(grid)
+	min := utils.MaxInt
+	for j := 0; j < grid.SizeY(); j++ {
+		for i := 0; i < grid.SizeX(); i++ {
+			c1 := grid.Get(i, j)
+			if c1.height == 0 {
+				min = utils.Min(min, c1.distance)
+			}
+		}
+	}
+	return min
+}
+
+func parseInput(input string) (coord, *grid2d.Grid[*cell]) {
+	lines := strings.Split(input, "\n")
+	grid := grid2d.NewGrid[*cell](len(lines[0]), len(lines), nil)
+	startCoord := coord{-1, -1}
+	for j, line := range lines {
+		for i, c := range line {
+			newCell := &cell{height: int(c - 'a'), distance: utils.MaxInt}
+			if c == 'S' {
+				newCell.height = 0
+				startCoord.x = i
+				startCoord.y = j
+			} else if c == 'E' {
+				newCell.height = 25
+				newCell.distance = 0
+			}
+			grid.Set(i, j, newCell)
+		}
+	}
+	return startCoord, grid
+}
+
+func fillGrid(grid *grid2d.Grid[*cell]) {
+	done := false
+	for !done {
+		done = true
+		for j := 0; j < grid.SizeY(); j++ {
+			for i := 0; i < grid.SizeX(); i++ {
+				c1 := grid.Get(i, j)
+				if c1.distance == utils.MaxInt {
+					continue
+				}
+				moves := [][]int{{0, 1}, {0, -1}, {1, 0}, {-1, 0}}
+				for _, move := range moves {
+					x2 := i + move[0]
+					y2 := j + move[1]
+					c2 := grid.Get(x2, y2)
+					if c2 == nil {
+						continue
+					}
+					if c2.height < c1.height-1 {
+						continue
+					}
+					if c2.distance > c1.distance+1 {
+						c2.distance = c1.distance + 1
+						done = false
+					}
+				}
+			}
+		}
+	}
+}
+
+func printGrid(grid *grid2d.Grid[*cell]) {
+	r := grid.StringWithFormatter(func(c *cell, i, j int) string {
+		if c.distance == utils.MaxInt {
+			return "?? "
+		}
+		return fmt.Sprintf("%02d ", c.distance)
+	})
+	fmt.Println(r)
+}

2022/go/day12/day12_test.go

@@ -0,0 +1,27 @@
+package day12
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi`)
+	require.Equal(t, 31, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi`)
+	require.Equal(t, 29, r)
+}

2022/go/day12/input.txt

@@ -0,0 +1,41 @@
+abccccaaaaaaaaaaaaaccaaaaaaaacccccccccaaaaaaaaccccccccaaacaaacccccccaaaaaaccccccccccccccccccccccaaaacccccccccccacccccccccccccccccccccccccccccccccccccccccccccccaaaa
+abccccaaaaacaaaaaaccccaaaaaaccccccccccaaaaaaacccccccccaaaaaaacccccaaaaaaaaaacccccccccccccccccccaaaaaacccccccccaaaaaaaaccccccccccccccccccccccccccccccccccccccccaaaaa
+abcccaaaaaccaaaaaaccccaaaaaaccccccaacccaaaaaacccccccccaaaaaacccaaaaaaaaaaaaaaacaaccacccccccccccaaaaaaccccccccccaaaaaacccccccccccccccccccccccccccccccccccccccccaaaaa
+abccccccaaccaaaaaaccaaaaaaaaccccccaaacaaaacaaacccccccaaaaaaaaccaaaaaaaaaaaaaaacaaaaacccccccccccccaaccccccccccccaaaaaaccccccccccccccccccccccccccccacccccccccccaaaaaa
+abccccccccccaaccaaccaaaaccaacccccccaaaaaaaccccccccccaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaacccccccaaaaccccccccccccccccaaaaaaaacccccccccccccccccccccccccccaaccccccccccccccaa
+abcccccccaaaaacccaaaaaaaacccaaccccaaaaaaccccccccccccaaaaaaaaaaaaaaaacaaaaaaaccaaaaaaccccccaaaaaccccccccccccccaaaaaaaaaaccaccccccccccccccccccccccccaccccccccccccccca
+abcccccccaaaaacccaaaaaaaaccaaaaccaaaaaaaaccccccccccccccaaacaaaaaaaaacaaaaaacccccaaaacccccaaaaaaccccccccccccccaaaaaaaaaaaaacccccccccccccccllllllccccdccccccccccccccc
+abccccccaaaaaacccccaaaaccccaaaaacaaaaaaaaccccccccccccccaaacccccaaaccccaaaaaacccaaccccccccaaaaaacccccccccccccccccaaaaaaaaaacccccccccccccklllllllllcddddccaccaaaccccc
+abccccccaaaaaacccccaaaaaaaaaaaaaaaccaaccccccaacaacccccccaaccccccccccccaaacaacccccccccccccaaaaaacccccccccccccccccaaaaaaaaaacccccccccccckklllppllllcddddddddaaaaccccc
+abccccccaaaaaaccccaaacaaaaaaaaaaaaccaaccccccaaaaaccccccccccccccccccccccccccccccccccccccccccaaccccccaaccccccccccccaacaaaaaaaccccccccccckklpppppplllmdddddddddacccccc
+abccccccccaaacccccaacccaccaaaaaaccccccccccccaaaaaaccccccccccccccccccccccccccccccccccccccccccccccccaaaaccccccccccccaaaaaaaaaaccccccccckkkkppppppplmmmmmmddddddaacccc
+abccccaaacaaacccccccccccccaaaaaaccccccccccccaaaaaacccccccccccccccccaaaccccccccccccccccccccccccccccaaaaccccccccccccaaaaaaaaaaccccccccckkkppppuppppmmmmmmmmddeeeacccc
+abccccaaaaaaacccccccccccccaaaaaacccaccccccccaaaaaacccccccccccccccccaaaacccccccccccccccccccccaaacccaaaacccccccccccaaaacaaaccccccccccckkkpppuuuuuppqqmmmmmmmmeeeacccc
+abcccccaaaaaaccccccccccccaaaaaaaacaaccccccccccaaaccccccccccccccccccaaaaccccccccccccccccccccaaaaccccccccccccccccccaaaaaaaacccccccccckkkkpppuuuuupqqqqqqqmmmmeeeccccc
+abcccccaaaaaaaacccccccccccaccccaaaaacccccccccccccccccccccccccccccccaaaccccccccccccccaaaccccaaaacccccccccccccaaccaaaaaaaaccccccccckkkkkrrpuuuxuuuqqqqqqqqmmmmeeccccc
+abccccaaaaaaaaaccccccccccccccaaaaaacccccccacaacccccccccccccccccccccccccccccccccccccaaaaaacccaaaccccccccccaaaaccaaaaaaacccccccccckkkkrrrrruuuxxuvvvvvvqqqqnnneeccccc
+abcccaaaaaaaaaaccccccccccccccaaaaaaaacccccaaaaacccccccccccccccaaaaaccccccccccccccccaaaaaaccccccccccccccccaaaaaaaaaaaaacccccccccjjjkrrrrruuuxxxxvvvvvvvqqqnnneeccccc
+abcaaaaacaaacccccccccccccccccaaaaaaaacccccaaaaaccaacccccccccccaaaaaccccccccccccccccaaaaaccccccccccccccccccaaaaaccaaaaaacccccccjjjrrrrruuuuuxxxyvyyyvvvqqqnneeeccccc
+abcaaaaacaaaccaaccccccccccccccccaacccccccaaaaaaaaaaaccccccccccaaaaaaccccccccccccccccaaaaaccccccccccccccccaaaaacccaaaaaaaacaaacjjjrrrtttuuxxxxxyyyyyvvvqqnnneeeccccc
+abaaaaaccaacccaaaccaacccaaccccccaccccccccaaaaaaaaaacccccccccccaaaaaaccccccccccccccccaacaacccccccccccccccccccaacccaaccccaaaaaacjjjrrrtttxxxxxxxyyyyyvvvrrnnneeeccccc
+SbaaaaacccccccaaaaaaaccaaaacccccccccccccccaaaaaaaaacccccccccccaaaaaaccccccccccccccccccccccccccccccccccccccccccccccaacccaaaaaacjjjrrrtttxxxEzzzzyyyvvvrrnnneeecccccc
+abcaaaaacccccccaaaaaaccaaaacccccccccccccccaaaaaaaaacccccccccccccaaccccccccccccccccccccccccccccaaccccccccccaaccccacaaaacaaaaaaajjjrrrtttxxxxxyyyyyvvvrrrnnnfffcccccc
+abcaacccccccaaaaaaaacccaaaaccccccccccccccccaaaaaaaaaaccccccccccccccccccccccccccccccccccccccaaaaaccccccccccaaccccaaaaaaaaaaaaaajjjqqqttttxxxxyyyyyyvvrrrnnnfffcccccc
+abccccccccccaaaaaaaaaccccccccccccccccccccaaaaaaaaaaaaacccccccccccccccccaacccccccccccccccccccaaaaaccccccaacaaaaaccaaaacaaaaaaaacjjjqqqqttttxxyywyyyywvrrnnnfffcccccc
+abccccccccccaaaaaaaaaacccccccccccccccccccaaaaaaaaacaaacccccccccccccaaacaacccccccccccccccccccaaaaaccccccaaaaaaaaccaaaaccccaaacccjjjjqqqqtttxwywwwyywwwrrnnnfffcccccc
+abcccccccccccccaaaaaaacccccccccccccccccccaaaaaaaaaaaaaaaacccccccccccaaaaaccccccccccccccccccaaaaacccaaccccaaaaccccaacaacccaaaccccjjjiqqqtttwwywwwwwwwwrrroofffcccccc
+abcccccccccccccaaaccccccccccccccccccccccaaaaaaaaaaaaaaaaaccccccccccccaaaaaacccccccccccccccccccaaacaaaccccaaaaaccccccccccccccccccciiiiqqqttwwwwwswwwwrrrroofffcccccc
+abcccccccccccccaaccccccccccccaaaacccccccaaaaaaaaccaaaaacccccccccccccaaaaaaacccccccccccccccccccaaaaaaacccaaacaacccccaaaaacccccccccciiiqqqttwwwwsssssrrrrroofffaccccc
+abcccccccccccccccccccccccccccaaaaccccccccacaaacccaaaaaaccccccaaccccaaaaaaccccccccaacaaccccccccaaaaaaccccaaaacacccccaaaaacccccccccciiiqqqtsswsssssssrrrrooofffaccccc
+abcccccccccccccccccccccccccccaaaaccccccccccaaaccaaaaaaaccccccaaaaccaacaaaccccccccaaaaacccccccccaaaaaaaaccaaacacccccaaaaaacccccccccciiqqqssssssspposrrroooofffaccccc
+abccccaaacccccccccccccccccccccaaacccccccccccccccaaacaaaccccaaaaaacccccaaaccccccccaaaaaacccccccaaaaaaaaaaaaaaaaaccccaaaaaaccccccaccciiiqqpsssssppppooooooogffaaccccc
+abccccaaaaaacccaaaccccccccccccccccccccccccccccccccccccaccccaaaaacccccccccccccccccaaaaaaccccccaaaaaaaaaaaaaaaaaaccccaaaaaacccaaaaccciiiqqppppppppppoooooogggfaaacccc
+abcccaaaaaaacccaaaccccccccccccccccccccccccccccccccccccccccccaaaaaccccccccccccccccaaaaaaccccccaaacaaaccccaaaaaacccccccaacccccaaaaaacciiipppppppphgggggggggggaaaacccc
+abccaaaaaaaacccaaacaaacccccccccccccccccccccaacccccccccccccccaacaacccccaacccccccccccaaacccccccccccaaacccccaaaaacccccccccccccccaaaaacciiihppppphhhhgggggggggaaccccccc
+abccaaaaaaacaaaaaaaaaacccccccccccccccccccccaaaccccccacccccccccccccccccaaccccccccccccccccccccccccaaaaccccaaaaaaccccccccccccccaaaaacccciihhhhhhhhhhgggggggccaaccccccc
+abccccaaaaaaaaaaaaaaacccccccccccccccccccaaaaaaaaccccaaacaaaccccccccccaaaaccaaccccccccaacaacccccaaaaaaacccaacccccccccccccccccaacaaccccchhhhhhhhhaaaacccccccccccccccc
+abccccaaaaaacaaaaaaaccccccccccccccccccccaaaaaaaaccccaaaaaaaccccccccccaaaaaaaacaccccccaaaaaccccccaaaaacccccccccccccccccccccccccccccccccchhhhhhacaaaaaccccccccccccccc
+abccccaaccccccaaaaaacccccccccccccaaccccccaaaaaacccccaaaaaaccccccaaaaaaaaaaaaaaaccccccaaaaaacccaaaaaaacccccccccccccccccccccccccccccccccccccaaaaccaaacccccccccccaaaca
+abccccccccccccaaaaaaaccccccccccccaaccccccaaaaaacccaaaaaaaaccccccaaaaaaaaaaaaaacccccccaaaaaacccaaaaaaaaccccccaaacccccccccccccccccccccccccccaaaaccccccccccccccccaaaaa
+abccaaacccccccaaacaaacccccccccaaaaaaaacccaaaaaacccaaaaaaaaacccccaaaaaaaaaaaaaacccccccaaaaaccccaaaaaaaaccccccaaaaccccccccccccccccccccccccccaaaccccccccccccccccccaaaa
+abcaaaacccccccaaccccccccccccccaaaaaaaacccaaccaacccaaaaaaaaaaccccccccaaaaaaacaacccccccccaaaccccccaaacaaccccccaaaacccccccccccccccccccccccccccccccccccccccccccccaaaaaa

2022/go/day13/day13.go

@@ -0,0 +1,86 @@
+package day13
+
+import (
+	_ "fmt"
+	"encoding/json"
+	"sort"
+)
+
+func Part1(input []string) int {
+	sum := 0
+	for i := 0; i < len(input); i += 3 {
+		left, right := input[i], input[i+1]
+
+		if isOrderRight(left, right) {
+			sum += i/3 + 1
+		}
+	}
+	return sum
+}
+
+func Part2(input []string) int {
+	var trimmed []string
+	for _, str := range input {
+		if str != "" {
+			trimmed = append(trimmed, str)
+		}
+	}
+	trimmed = append(trimmed, "[[2]]", "[[6]]")
+	sort.Slice(trimmed, func(i, j int) bool {
+		return isOrderRight(trimmed[i], trimmed[j])
+	})
+
+	start := 0
+	end := 0
+	for i, value := range trimmed {
+		if value == "[[2]]" {
+			start = i + 1
+		}
+		if value == "[[6]]" {
+			end = i + 1
+			return start * end
+		}
+	}
+	return 0
+}
+
+func isOrderRight(left, right string) bool {
+	var l, r = unmarshal(left, right)
+
+	if cmp(l, r) <= 0 {
+		return true
+	}
+
+	return false
+}
+
+func unmarshal(left, right string) (any, any) {
+	var l, r any
+
+	json.Unmarshal([]byte(left), &l)
+	json.Unmarshal([]byte(right), &r)
+
+	return l, r
+}
+
+func cmp(left, right any) int {
+	l, lok := left.([]any)
+	r, rok := right.([]any)
+
+	switch {
+	case !lok && !rok:
+		return int(left.(float64) - right.(float64))
+	case !lok:
+		l = []any{left}
+	case !rok:
+		r = []any{right}
+	}
+
+	for i := 0; i < len(l) && i < len(r); i++ {
+		if res := cmp(l[i], r[i]); res != 0 {
+			return res
+		}
+	}
+
+	return len(l) - len(r)
+}

2022/go/day13/day13_test.go

@@ -0,0 +1,67 @@
+package day13
+
+import (
+	"testing"
+	"strings"
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	input := `[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]`
+stringSlice := strings.Split(input, "\n")
+r := Part1(stringSlice)
+
+	require.Equal(t, 13, r)
+}
+
+func TestPart2(t *testing.T) {
+	input := `[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]`
+stringSlice := strings.Split(input, "\n")
+r := Part2(stringSlice)
+
+	require.Equal(t, 140, r)
+}

2022/go/day13/input.txt

@@ -0,0 +1,449 @@
+[[[[8,6]],[8,[7],[6,7,6,2,4]],10,[[1,7,9],7,[7,9]]],[[4,[],[10,5],[5,4,7],5],8,9,[[5,3,3,6,9],[9,5,10],8],[[0,6,9],[8],4,6,8]]]
+[[[],3,[[10,6,9,6],[6,8,7],[1,2]],8]]
+
+[[4,[4],[[10,7,2],[1,6,5,7,4],[7,3,3,1,5],[]],1],[[],[[7,6,3]],5,5]]
+[[[10]]]
+
+[[[[7,9]],[[0,9]],0,[[2,1,1,2,9],4],[[5]]],[]]
+[[8]]
+
+[[9,[[5,4,5,1,10]]],[[[6,9],3,[0,2]],5,6,[3,4,[2,2],10],[10,5,9]],[[[10,3,8],[],[6,9]],4]]
+[[[4,[7],[1,1,4,3,8],[3],[]],[[5,10,2,1],9,[2],6,7],4,[],[[10],[6,3,1,7]]],[4,[6],[[6],[6,6]]],[[[0,2,5],[3,5,10,7],[10,7,2,9],[],[0]],[[9,9,8],[]],[10,[2,10,7,7,3],4],[2,7]]]
+
+[[[],2,2,9,[[9],[1,10,5,1]]],[[[],9,5,[8]],10,9,[[1,4,0],[5]]]]
+[[5],[3],[],[9,[[7,2,0,9,3],[6,8,6],[]]],[[[6],3],6,[[2,8],8]]]
+
+[[]]
+[[[5,4],5]]
+
+[[7,7,5]]
+[[[[4,7,3],[6,0],1,6],[6,1,4,5]],[]]
+
+[[[[4,7,0,9,8],10,7,2]],[6,6,9],[[2,10],8,9,1,[1,[0,4]]],[[[2,0,2],[]]]]
+[[[[]],[],3],[],[[[],[8]],[[4,7,3,7,10],3,5]],[[9,[10,5,8,9,1]],0],[[[6,7,5,4,10],4,6,0,[8,3,1,2,7]],5,[10,1,5],10,0]]
+
+[[],[[3,8,2]]]
+[[8,4],[5],[3]]
+
+[[0,1,5,[[],[6,6,8,0],[0,2,5,9,9],[3,2,7],[5,2]],10],[],[[8,8],[1,3],3,2],[[[4,0],[]],[[4,1,2],[2],6,9,6],1,10,[[7],[0,7],5]],[4]]
+[[[],[6,[5,9,6,0,8],2,9,[4,2]],7,[9,6,0,10]]]
+
+[[],[],[],[9,[[1],[6,3,4,9]],10,8]]
+[[1,[[2],10,[0,9,3]]]]
+
+[[0,1,4,4],[[7,[6],[2,5,1,3],5],[[8,3,7],[6],[],8],8,1,[9,0,[]]],[[0,[3,9,3,5],[2,0,9,0,7],6]],[[[3,3,1,10,9]],[[0,7,1],8,[10,0],8],[[9,3,5,4],5,[0],5],8,[[3,6,10],0,2,6]]]
+[[[8,[1,2,10,9],2,[8,4,4]],[3,[5,5]],4],[[],2,[],6,3],[[10,7],[],7,[8,6,[5],4,3],2]]
+
+[[[[],1,2],[[7,7,7],6,[1,7,1]]],[4,8],[]]
+[[3,1,[1,6,[9,9,5],5],[[1,7,0,6],[10,8,10],[3,8],[6,2,7,5]]]]
+
+[[1]]
+[[[3],[[9,4,10,10],[8,9,1],[],[0,3,10,5]],[8,[]]],[[[10,6,0],2,1],5,0,[7],[[9]]],[[[],[9,9,3,2,3],5]]]
+
+[[],[7,2],[5,[9,[]],1,[4,6,5],[[9,10,8,3],6]]]
+[[[[]],0,[1,8],[5,2,7,2],6],[],[[],[[2,1,3,9],6,9,5,3],2],[[[10],[0],[4,0,3,6,8]],4],[9]]
+
+[[],[],[],[]]
+[[],[[3,6],6,[6],[[3,10,4],6],[]]]
+
+[[8,7,10],[3],[9,[],[[5,1,6,10,4]],4,[[9,8,1,1],[0,0,2],1]]]
+[[[1,6,[4,5,3,1]]],[[],[[7,0,5,1,9],6,[0,9,4,3]]]]
+
+[[2,2,1,8],[],[[[10,4,10,6],[2,8,3,10,6],[]],1,6],[6,0]]
+[[2,3,[8,[2,7]],8],[4,[[6,6,4,2],4,5,[7,5]],8,1,[]],[7]]
+
+[[[],[1,[9,1,9],[8,8,8,5]],3,[4,9,4,[2,6,6]],[]],[[7,[1,9,6]],6,[[10,0,0],[4,7,1],4,9,7]]]
+[[[[],8,5,1],3,[[8,2,2],4,[2,1,2,3,7]],10,[2,[5,7,6],3,[9,6,5,0,9],4]],[],[9,3,2,7],[4,[[4,10],[8,3,8]],6,[],9]]
+
+[[[],[[],[5]],4],[[0,[],9,[8,5,3,2,2]],[8]],[[[2,5]],[10,8,[7,8,7,3]],5,[[2,10],3,8,0,[6,9,10]],5],[[0,[7],[]],[[3,9,4,1,6],8],[[4,4,7,2],8],[[3],[],3],7]]
+[[[2,0,[7,5]],[1,5,7,6,[]],9,[2,1,[6,0],3,[3]]]]
+
+[[1,3,10,[]],[],[7,[8,4],[[],0,[4,8],6],4,[[4,0],[5,0,8,3],[0,1],8,[2,9,7,6,5]]],[3,5],[9,[[8,3,6,0],[10,0,5],10],[[10,1,4,0],4,8,5],9,[7,[0],[7,9],7,2]]]
+[[2,9,0,[[5,8,10,10,5],8,4,[5,6,10]],10],[8,[0,[10],[6],4,[]],[[9,4,0],[],[2,10,3,3,4],[3]],1,10],[[[],0,7,3,3],9,[[5,3,0],5,[4,6,6,7]],[]],[6,[[3,1],10,[0,8],0],8,[4,[],[8,0,7,9]],7],[9,4,[10],[[2,10,7,6]],1]]
+
+[[[],8,9,2,[6,[0,2,10,2],[4,9,7,2,10]]],[9,[[3,4]],5,9]]
+[[9],[[],[1,6,[5,9,9,9,0]],6]]
+
+[[5,2,10],[2,[[],7,9,3],0,[7,[]]],[[9,[5,6,5,0],4,0,3],10,1,[]],[8,10,3,9]]
+[[[2,[3]],9]]
+
+[[],[6,[3,[],[]],8,[[7,7,8,2],4],0]]
+[[[[0,5,7]],[[]],7,[4,[9,0,5],7,3]],[5,[[0,8,10,0],3],[1,4],[10],[]]]
+
+[[1,5],[10,[[9,7,1]],0,[9,[6,3],[7],9,[]]]]
+[[5,[2,[4,0,4,7,8],[4]]],[8,[2,9],5],[],[4,2]]
+
+[[7,[[0,0,5,4]],4],[[[2,4]],[1,[3,2,8],[9,1,8,2,2],0,1],2],[[[4,7],3,3,9]]]
+[[],[[[8],0,10,[0,4]],2,[9,2]],[10,4],[2,[7],10]]
+
+[[[],10],[[6,7,[8,6,6],2],5,[9,[5,7,9,0],[10,6],7]],[[],[5],10,[[6],6,7,6,[6]]],[[]]]
+[[[[],[]],[]],[[[6],[9],[4,0,8,5]],[3],[[8,2,7,7]],[],[3,[5,1],[9],[7,1]]],[[7,[0],[],3],[2]],[[]]]
+
+[7,10,4,6]
+[7,10,4,6,9]
+
+[[9]]
+[[7,2,6],[[6,9,[]],[5,3,6],[2],[[0,7,1],[0],[2],[9,9,0,8,2],[9,5,7,6,8]]],[[8,6,10,0,8],[9,[3,10],4,[2,4,3,4,4],5]],[],[]]
+
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+[[[[4,1,2,9],[8,5,10,5,7],0],[[0,3,6],10],8]]
+[[[3,[2,2],[5],[8,2,0,0,9],4]],[8,7,[[3,8,9,4],10],7]]
+
+[[9,9,[10,[0,5,1,5],[5,9],[7,10,9,10]],8],[1,0],[],[5,3,[5,10],2]]
+[[[0,8,8,8]]]
+
+[[5,[[10]]],[[],1,[[9],[10,6,6,0],4],[7,8,6]],[[5,[2]],[],[8,[10],1],10],[[10,[5,5,1],6,0],0]]
+[[10,[9,1,[7,5,3],8],[[10],8]],[[6,[6]],[10,0,6,0,2]],[[[],0],[10,9,8,4,[1,6,8,3]]],[9,9,6],[10,[]]]
+
+[[[[6],[1]],4,[[5,10],[0,10],6],[[5,7,10,10],[6,5,0,10],[],[3,9,8,1,0]],4],[],[[0],3,1,0],[6,[[9]],[[5,9],4,[9]]]]
+[[[[9,8,6]]]]
+
+[[10,6]]
+[[],[4,[[0,3,8,8,1],[0,10,7,7,7],[],[8]],[[],[1,1,10],4],2,[[6,3,1,5]]],[]]
+
+[[[],0,5,8]]
+[[3,[10],10,[],7],[[[5],[8,8,6]],[[7,2,0],6],0,6],[[5],[[3,6,1,8,6],8,5],[[],[9,7,0,9,4],0,9],10,5]]
+
+[[],[]]
+[[1,0,[[5,4,5,2],0,6,[7,2,8],4],[[2,10],9,3],4],[4],[[4]],[[6,3,[],4],0,4],[4,[]]]
+
+[[[[4],[2,4],6,[]],1],[10,[3,0,4,[2,0,4,3]],[[5,6,0,1,2]],[[3],0,[]],[[6,10]]],[4],[],[2,2]]
+[[[3,[4,1,4,2],[1,3],[6,6]],[[10],9,[2,0,1]]],[3,9,[3,[5,9,5],7,[1,10,9],8],10],[[3,[7,9,1,10,4],[5,8],[9,10,8,7,1],5],9,2,[[3,7,0],10,[],[7,6,2,5,1],[]],[]]]
+
+[[[[2,9],[]]],[[10,[2,10],[],[7,1,2],9]]]
+[[5,9,6,[0,[2,9,6],[2,2,1]]],[1,[[8,4],[9,1],[7,1,10,5,4],[9,4]],9,6],[4]]
+
+[[[0,[10,3,10,0],5,4,1],[],8,1,10],[[],[[7],[8,3,7,8],[3,9,2,0],9,[9,5,7,4,1]]],[],[0,10,[0,[9,5,0,5],[7,9,7,10,9],0,[]]],[]]
+[[1,1,7,0],[10,7],[[1,0,[8],5],6]]
+
+[[[8,4,[5,5,2],3]]]
+[[0,7,[6,[],[10,5]],5],[3],[9,8,[],[[2],[1],9,[3,6]],[[]]],[0]]
+
+[[[6],[[2,6,10],[8,3,10,1,10]],2],[[[8,2,8,10,3],5]]]
+[[[[]],8,[[8,4],[],[],[4,4,1,0,10],[1,5,2,4,6]],3,[0,[8,0,2]]]]
+
+[[8,3,[4,[]],[[3,5,5,7,8],[2],1]],[]]
+[[[[6,5,1,3],0,6]],[7,9,[],0]]
+
+[[4,0,[[8,0,10,7],10,1,[10,1,8,10],[]],4,10],[7,1],[8],[7,[[4,0,7,1]],[7],[]],[]]
+[[8,[[10,8,4,7,10]],[[10,2]],[5],[[1,5,2,6]]],[[[4,4,3,4,4],6],9,[6],[0,[9,6,5,1],[9],[8,5,0],[0]]],[8,5,[8,[2,6,0,3,4],7,4],8,[6,[4,0,10],[]]],[[[8],[0,2,8,0]],[6,[1]],[],1],[]]
+
+[[2],[[[8]],6],[2,[[7],10,0,[8,7]],9,[9]],[]]
+[[2,[[4,9],4,[],9]],[[1,[8,7,3],0,2],2],[[],5,2],[0,10]]
+
+[[4,7,0,[],[0,[0],[3,2,10,1],[0,4,4]]],[7,5,[[0,4,6]],[[2,9,1,4,0],9,[8,10,5,7]]],[6,[5,9,[8,0]],[5],[]]]
+[[[6,[4,1,6,0,2],10,[2,5,3]],[5],9]]
+
+[[8,[2],[]],[1,10,3],[10,[[1,8,6,7],9,6,0,5],[3,10,0]],[[[1,9]],5],[10]]
+[[[[],[6,6,4,6,2],10,[7,5,8]],[[3,8,7,3],2,9],0],[2,1,[9,[7,7,3]],[9,8],[[3,9],[8,10],[7,10,6],0,[]]],[0,2,5],[[[3,6,6,10,3],[],[3,6,5,0],[]],[9,[4,6,8,5,9]],[[8],[1,1,8,1],7,4,[2,10]],8],[10,[6,[],[]]]]
+
+[[[3],[],8,[[3,9,9]]]]
+[[[[3,0,3],9,[3],2,10],6],[[],[0,7,8,8,[5]],9,[8]]]
+
+[[1,3,[[5],[3,7,1],7,[10,8,5,10,6]]],[[10,5,4],7,[0,[4,8,1,4,5],[5,0,5,4,8],5,8]],[6],[7],[[[7,6]],9,[0,[9,10,10],9],2,9]]
+[[5,10],[6,5,[]],[2,2,1,[],5]]
+
+[[[9,[3,7,5,0,10],[2,4,8],[8,9,5]],[],2],[10,8],[[[10,6,4,9],[5,5,3,0,10],[8,10,3,7,5],[8,4,3,5]]]]
+[[[1]],[[],6,[1,[4,3,6,8,8],7,[3,3,4,9],[9,8,1,3]],[[7,8],0,1]],[5,[8],8],[[[0],4,[1],[7,0,7,8,8],7],[6,5,[5,0]],10,[[7],[6],9]],[3,10,[2],[[8,2,4]],0]]
+
+[[[3,9],5,3,7],[2,2,4],[[[7,1],3,4],[]],[[[8,1,10,9,10],7,[7,10,3,8],1,3]],[[10]]]
+[[[0]],[]]
+
+[[[]],[[4,8,[8,0,7,3]],5,3,1],[5,8,[8,[2,7,9,3,2],[5,0,1,4,7],5],8,[[9],3,[9],[8,2,5,3],[5,8,4]]],[9,1,1,[7],[]],[6,[2,[1,3]],[3,4,[8,6],0,2]]]
+[[[2,7,2],[]],[6,3,[8]],[4]]
+
+[[],[[2],[[5,8,1,9,6],[],7],4],[],[[6,9,[7],2,1],[8]]]
+[[[3,7,[],6,3],[6],5,3]]
+
+[[3,8,[[3,4,1,2,3]],[0,[1],[7,3,8,10,9]],[[2,10,7]]],[[[0,3,8,9],[0,6,8],8,1,2],7,[9,0,7,[9,5,0]],[[]],[[5,3,6]]]]
+[[10,[]],[2,[4],[]],[[[0],[0,6,5],[7,4,3,2,3]]],[]]
+
+[[4,[[8],[5,10,9,6,5]],9,5],[2],[2,10,5,[]],[[[0,10,8,1],3,6],8,8,[[5,10,9,6,10],[4,10,9,9],4,10]],[2,[4,[9]],8,1,[7,7,1,[]]]]
+[[[8,5,0,[10,6,5],[0,6,1,0]],[[1,1,3],[6,6,3,7,5],9,10,[8]],[[3,3],7,[5,0],4,[9,3,9]]],[[4],[[6,6,0],7,5,3]],[],[3,[0,[10,8,10],[3,0],8],[3,3]],[[[10]],[[7,6],[2,7,10,0,5],6,0],[[9,3,10,2],8,[5,8,1]],10]]
+
+[[[],6,9,[2,[10,4,6,9,1]]],[[[8,6,4,5],1,[5,5,3,7,8],[]]],[[[5,5,10,7]],[[2,4],0,[2,2],10,[]],[[1],[0],[1,1,7,3,8],[4,10,0,0]]]]
+[[7,5,[[],10,[],6,[4,1,1,1]],[8,4,[4,0,9,0]],[]]]
+
+[[[[4,0],[]]]]
+[[[6],7],[[6],3],[6,[[2,6,10,7,8],1,2,10,4],[[1],6,5,6]],[]]
+
+[[8,[2],[4]],[],[]]
+[[[[6,8,10,8,5]],9],[]]
+
+[[[]],[],[[[8,3,5,4,4],[9,5,4],[2],[9,4,3],[3,7,3,9]]],[4,[3,[]],0,[[10,9,0],2,8,[1],[]]]]
+[[],[7,[]]]
+
+[[],[1,[2,5,[]],4,10,2],[0,8,5,[[10,9],1],[[],3,[3,6,0,7,2],0,[2]]],[[[7,2,9,2],[],[3],8,[]],10,[8,0,[6]],[10]],[5,[[9,10],2,[9]],3,[9,[4,9,5,9,7]]]]
+[[[[2],[5,1,3,2,10]],[7,[3,7,4,2,7],[9,2,6,8],1],[[8,4,3],[8,8,5],5,6,6]],[]]
+
+[[6],[7,[[0]],[3,7,[7,5,8,0,9]]],[],[7,[3]],[0,0]]
+[[0,0],[[9,0],[[10,7],[2,5,8,8],6],[[9,5,3,3,9],[7,4],8,6,2]]]
+
+[[[],[3],1],[[[0,4,0,8,0],3,[5,1,9,5]],8,8,6]]
+[[2,1,5]]
+
+[[],[[8,[6,1,0,9],6],9,3,1]]
+[[],[4]]
+
+[[[[3,5,4,10,4],10,[2,3],9],8,[4,[2,4,3,10,6]],5]]
+[[0,8,[]],[10],[8,[2,[9,6,9,9],[10,9]],8,[1,0,2],7],[[8,5,[1,2],[7,7,5,1],[1,5,6,6,0]],8,[],[0,[9],1,[3],[8,4]]],[[6],9,8,5,[0,3,[8,10,4,9]]]]
+
+[[[1,[5,2,4,0],[3,8,7,3],[6,4],[]]],[],[],[7,8]]
+[[[[7,4],7,[5,8,2,4,9],8,[8,7,10,7]]],[[5,[],8,[0,9,4,5,8]],[[5,1,8],10,[],7,8],0,[],1],[[[0,3,3],[]],2]]
+
+[[],[[7,[7,10,3,8,8],[],6]],[3,[[2,0,8,2],[],2],[[4,7,2,7,10],5,[0,6]],10,[[],[8,0,8,9,0],[0,1,10,8,1],3,9]],[[[3,3,0,6]],[[10,1,0,5,8],7,3]],[0,[4,[1,1,0,10,10],5,1],[[1,4,8,2],8,[6,9,1],8],1]]
+[[10,10],[6,6,[5,[],6,[4,4,9,9]],4],[],[7]]
+
+[[],[[[8,5,2,0]],7,4],[[8,[7]],1],[],[0,0,[1,[0,6,10],[4],[],1],[4],3]]
+[[[[],[10,1],9,[2,6]],[[],9],[3,[7,0,10,3,8],[0,6]],3],[1,[[3,7,6,5]]],[[]],[[],[10,2,0,[8,3]]]]
+
+[[[0]],[4,7,[[3,8,4],9],[[8,1,5],[1,1,7,6,2]]],[],[]]
+[[[5,0],[3],[1],[]],[[[5,1],6,7,0,10]],[[[6,0,1],0,[]],[9],[],[[9]],[9,[6,0,4,1]]],[]]
+
+[[10],[],[3]]
+[[[[5,2,0,3],5,[],[7,1,5,7]]]]
+
+[[[5,10,[3,4,5,4],8,0]],[[4],[[3,9,2,8,0],6,6]],[[],7,5,[0,0,[],[10]]]]
+[[2,3,5,[[9,5],6],0],[[[4,5,7,6,5],[6,1,9],8,[6,6,6],8],[7],8,5],[0,[6,[0,9,3,5],[9,1,9],3,7],[]],[[[1,6,0,5,0],[1,2,5,6,8],0,8],7]]
+
+[[[],9],[]]
+[[8],[[[]],[],[3,3,[10,7,9,0,6],0],9],[],[[[5,10,5,8,10],[5,1,8,10,8]],6,0,[3],[[]]]]
+
+[[7,[]]]
+[[[],9,[[0,9,1],[6],9,[8,4,10,4,7],[6]]],[3,[2,[0,5],7,9],2],[[[9],7,[1,7],9]]]

2022/go/utils/inputFile.go

@@ -0,0 +1,56 @@
+package utils
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+)
+
+func GenInputFile(day int) string {
+	var d string
+	if day < 10 {
+		d = fmt.Sprintf("0%d", day)
+	} else {
+		d = fmt.Sprintf("%d", day)
+	}
+
+	pwd, _ := os.Getwd()
+	path := fmt.Sprintf("%s\\day%s\\input.txt", pwd, d)
+	fi, _ := os.Stat(path)
+	if fi != nil {
+		return path
+	}
+
+	fmt.Println("Creating new input file...")
+	f, _ := os.OpenFile(path, os.O_CREATE, 0700)
+	f.WriteString(readHttp(2022, day))
+	return path
+}
+
+func readHttp(year, day int) string {
+	fmt.Println("Fetching data into file...")
+
+	url := fmt.Sprintf("https://adventofcode.com/%d/day/%d/input", year, day)
+	session := os.Getenv("sessionAoC")
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		panic(err)
+	}
+
+	req.AddCookie(&http.Cookie{Name: "session", Value: session})
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		panic(err)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		panic(err)
+	}
+
+	return string(body)
+}
+

2023/go/.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "args": ["16"],
+            "program": "${fileDirname}"
+        }
+    ]
+}

2023/go/day08/day08.go

@@ -0,0 +1,101 @@
+package day08
+
+import (
+	 "fmt"
+	_ "adventofcode2023/utils"
+	"regexp"
+	"strings"
+	"math"
+)
+
+type Node struct {
+	left string
+	right string
+}
+
+type Network map[string]Node
+
+func Part1(input string) int {
+	instructions, network := parseInput(input)
+	return getSteps("AAA", instructions, network, true)
+}
+
+func Part2(input string) int {
+	instructions, nexts, network := parseInput2(input)
+	fmt.Println(nexts)
+	ans := 1
+	for _, next := range nexts {
+		ans = lcm(ans, getSteps(next, instructions, network, false))
+	}
+	return ans
+}
+
+// gcd calculates the greatest common divisor using Euclid's algorithm
+func gcd(a, b int) int {
+	for b != 0 {
+		a, b = b, a%b
+	}
+	return a
+}
+
+// lcm calculates the least common multiple using the formula: LCM(a, b) = |a * b| / GCD(a, b)
+func lcm(a, b int) int {
+	if a == 0 || b == 0 {
+		return 0
+	}
+	return int(math.Abs(float64(a*b)) / float64(gcd(a, b)))
+}
+
+func parseInput(input string) ([]rune, Network) {
+	network := make(Network)
+	lines := strings.Split(input, "\n")
+	instructions := []rune(lines[0])
+	re := regexp.MustCompile(`(\w+) = \((\w+), (\w+)\)`)
+	
+	for _, line := range lines[2:] {
+		matches := re.FindAllStringSubmatch(line, -1)
+		network[matches[0][1]] = Node{matches[0][2], matches[0][3]}
+	}
+	return instructions, network
+}
+
+func parseInput2(input string) ([]rune, []string, Network) {
+	network := make(Network)
+	lines := strings.Split(input, "\n")
+	start := []string{}
+	instructions := []rune(lines[0])
+	re := regexp.MustCompile(`(\w+) = \((\w+), (\w+)\)`)
+	
+	for _, line := range lines[2:] {
+		matches := re.FindAllStringSubmatch(line, -1)
+		network[matches[0][1]] = Node{matches[0][2], matches[0][3]}
+		if matches[0][1][2] == 'A' {
+			start = append(start, matches[0][1])
+		}
+	}
+	return instructions, start, network
+}
+
+func getSteps(next string, instructions []rune, network Network, partOne bool) int{
+	steps := 0
+	for {
+		for _, ins := range instructions {
+			steps++
+			if ins == 'L' {
+				next = network[next].left
+			} else {
+				next = network[next].right
+			}
+			if partOne {
+				if next == "ZZZ" {
+					return steps
+				}
+			} else {
+				if next[2] == 'Z' {
+					fmt.Println(next)
+					return steps
+				}
+			}
+		}
+	}
+}

2023/go/day08/day08_test.go

@@ -0,0 +1,32 @@
+package day08
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`LLR
+
+AAA = (BBB, BBB)
+BBB = (AAA, ZZZ)
+ZZZ = (ZZZ, ZZZ)`)
+	require.Equal(t, 6, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`LR
+
+11A = (11B, XXX)
+11B = (XXX, 11Z)
+11Z = (11B, XXX)
+22A = (22B, XXX)
+22B = (22C, 22C)
+22C = (22Z, 22Z)
+22Z = (22B, 22B)
+XXX = (XXX, XXX)`)
+	require.Equal(t, 6, r)
+}

2023/go/day08/input.txt

@@ -0,0 +1,704 @@
+LRRRLRRRLRRLRRLRLRRLRRLRRRLRRLRRRLRRRLLRRRLRRRLRRRLRLRRLRRRLRLRRRLRRRLLRLRLRRLRRLLLRRLRRLRRRLLRRRLLRRRLRLRRRLRRRLLRRLRLLRLRRRLRRLRRLRLRLRLRLRLRRRLRLRRRLLRLRRLRRRLRRRLRLRRLRLLLRLRLRLRLRLRRRLLRRLRLRLLRRRLRRLRRRLRRLRRLRRRLLRRLRLRRLRRRLRRLRLRRLRLLRRLLRLRRRLRRLRLLRRRR
+
+RHQ = (QNL, HDC)
+FVH = (LMX, SDD)
+MCR = (THP, XKJ)
+RFJ = (TVQ, HGJ)
+MLK = (KKF, MMK)
+JDL = (XXQ, BFT)
+KXN = (HFS, XFM)
+NJP = (MSB, PBD)
+KDR = (VFC, SBM)
+RKR = (MBK, RFS)
+RJB = (PQK, FHB)
+XTL = (LMG, LMF)
+QDD = (KFF, JSD)
+CFP = (VBK, XNS)
+BQX = (FFP, SKX)
+NSJ = (HNC, MLQ)
+KQQ = (LTG, TNH)
+KVN = (SSJ, LNK)
+QCT = (FQQ, LLX)
+LBB = (VMQ, THT)
+DPQ = (PGL, GTC)
+RTH = (QNQ, CMS)
+QLS = (NFV, FKX)
+FST = (DNQ, QJQ)
+MHX = (LFT, JDL)
+JLF = (CCF, JNJ)
+TQJ = (VVT, TBV)
+HSC = (LKR, GTS)
+GHV = (NFS, RNT)
+VBK = (CPT, MBX)
+HVV = (CFH, QGR)
+JMG = (LXR, NHP)
+DDJ = (LNK, SSJ)
+NKV = (HLG, TCT)
+QBG = (FHB, PQK)
+FKH = (DDS, JLK)
+TLF = (VKH, QLQ)
+NTR = (MLL, GKH)
+KFF = (MDN, HCD)
+NPF = (FCP, VLM)
+PKP = (HXS, KGH)
+DVV = (TDH, XKB)
+SNM = (BJN, SGS)
+JVC = (PKX, CGR)
+VLB = (RDM, VBP)
+RQQ = (KQQ, HHB)
+SHH = (RRP, CSQ)
+DPN = (HLR, LCK)
+MCT = (BQG, SMV)
+FNJ = (QML, TVP)
+RGK = (CTF, KTS)
+HNC = (VPX, PPR)
+JLG = (THT, VMQ)
+RJJ = (PLT, TFH)
+VRK = (CMS, QNQ)
+JGJ = (JLF, RFM)
+RMD = (BVV, XTG)
+MBB = (QTQ, MCH)
+KDN = (LMF, LMG)
+SPR = (KHB, BPG)
+TFN = (CTT, JGH)
+LXR = (VTV, GRD)
+MPX = (LSD, RDD)
+SDN = (FLL, XSG)
+RMR = (TMB, NKV)
+FJM = (STG, DLM)
+HKK = (VPV, HFQ)
+GQG = (JDL, LFT)
+SQM = (CJM, HSN)
+BFM = (LKX, LKX)
+KMH = (NDL, GNG)
+THT = (DXV, PHQ)
+XHT = (FXG, PVN)
+JCJ = (BVJ, FKM)
+MBX = (CKQ, CST)
+XPJ = (QHB, RKH)
+NLL = (KXP, RXV)
+VJD = (MBK, RFS)
+SGS = (QQB, DMG)
+FBS = (PQH, MCR)
+XFT = (FHC, PKJ)
+LXS = (GCR, FVL)
+CPC = (KFS, RTM)
+PKX = (CND, KFP)
+TKK = (XBR, NTR)
+NTJ = (QCQ, MJQ)
+DVC = (TPP, FBS)
+NVC = (DPN, CNF)
+CFG = (TRX, VFS)
+SDQ = (KMH, GFG)
+GNG = (RLH, FKJ)
+TXL = (XNP, XHF)
+FKM = (STF, BDQ)
+DDN = (NKG, CFP)
+KMB = (NKG, CFP)
+VQD = (TQJ, VGS)
+DBX = (BGX, SSX)
+QTX = (QCX, MSS)
+VMN = (SDQ, DFD)
+MJQ = (GGM, XSR)
+VGS = (TBV, VVT)
+HDC = (NNN, BNV)
+FVB = (TQS, XBQ)
+QML = (LDS, PVQ)
+GTS = (PJK, XQP)
+LLX = (QNG, RHD)
+NRG = (VFK, QHK)
+KVD = (MBB, TJD)
+FMV = (CSX, BKH)
+RDK = (NKP, JGJ)
+HFR = (DFD, SDQ)
+QLQ = (VMN, HFR)
+MVB = (JNM, DKL)
+RXQ = (MMT, DFP)
+QQP = (VFS, TRX)
+SCN = (XRD, XRD)
+SDR = (JKQ, XHC)
+VCB = (JGD, VQD)
+PPR = (KGD, DJJ)
+QVZ = (JLB, DXR)
+CMT = (JDG, CNN)
+FGX = (HRX, VLQ)
+KTS = (CPB, DMP)
+CJM = (VTX, NTJ)
+SPQ = (RGS, KKV)
+DDS = (MCT, FMS)
+LMT = (RJJ, MTR)
+NNN = (RTH, VRK)
+NHP = (GRD, VTV)
+CGX = (MMM, MJT)
+FDQ = (NHM, QTX)
+XHF = (JGM, PBC)
+QJQ = (TFJ, HKR)
+STF = (RFR, DHN)
+CVV = (LSD, RDD)
+MPR = (JVC, XMS)
+VFG = (MFV, RPC)
+DVH = (SHS, FML)
+CNF = (LCK, HLR)
+VFK = (GSH, FVB)
+HXB = (KPC, PMF)
+TRX = (VMG, LXF)
+DBP = (KQQ, HHB)
+TKQ = (RCD, RLC)
+MFT = (BNR, TFN)
+XMM = (GCR, FVL)
+DSJ = (QLS, CFJ)
+XNM = (RKJ, MGB)
+CPB = (CDM, XSL)
+BVV = (DQK, FDC)
+XVN = (VVM, NTB)
+LTB = (MBB, TJD)
+LTG = (FCK, JMG)
+JTG = (CGX, PBQ)
+MSB = (PXM, SHH)
+GHS = (XDT, RKG)
+HPN = (PMF, KPC)
+VHN = (MHX, GQG)
+PGB = (XBR, NTR)
+RHD = (NFR, XRV)
+DKL = (CDJ, MPR)
+PVN = (LSN, RRQ)
+VFC = (QXB, RTX)
+HFQ = (MCC, QVB)
+MGB = (RGN, TGP)
+JDD = (KVB, GGL)
+GRB = (FCC, GHR)
+NLC = (NJC, JJL)
+FQM = (MSB, PBD)
+VSN = (BPD, FKN)
+RFS = (GKT, TQQ)
+XSG = (RKS, RRV)
+CXS = (SHB, XDD)
+MKN = (JNQ, SDN)
+PXM = (RRP, CSQ)
+JNQ = (XSG, FLL)
+NCP = (HPV, KKX)
+NKS = (PJH, XPT)
+PGL = (VGD, VGD)
+SDD = (LRG, FRT)
+JKV = (XVS, KKR)
+LXF = (BFM, PSF)
+XBR = (GKH, MLL)
+DQK = (RSF, STP)
+QLR = (DXR, JLB)
+DQD = (LCC, XFT)
+CST = (VFG, NRV)
+SNR = (BPG, KHB)
+GKH = (BNJ, NRL)
+XTG = (FDC, DQK)
+PBC = (JFV, VHN)
+FRT = (SXR, CTX)
+TTQ = (MGB, RKJ)
+TKJ = (HHM, RTD)
+LLQ = (RNT, NFS)
+QGZ = (NQV, CCP)
+GCN = (CSX, BKH)
+SSM = (RCF, VNG)
+XRT = (DLB, BJB)
+BVJ = (STF, BDQ)
+QXM = (CSK, SDR)
+QJM = (DBP, RQQ)
+VVM = (KDD, HDN)
+CTX = (JVG, XCN)
+XCM = (KXN, KCQ)
+FDC = (RSF, STP)
+KFS = (KMF, XSS)
+RVN = (GDL, GHS)
+JXZ = (RMD, SMQ)
+SXF = (VBP, RDM)
+JCS = (RQF, QFL)
+CSX = (RXD, LSC)
+TXS = (GBQ, JHK)
+RQF = (MBC, SQM)
+QXB = (NXK, DFN)
+PKJ = (BSB, NDP)
+VMQ = (DXV, PHQ)
+HLG = (NCP, KBQ)
+CSQ = (LJP, BGN)
+MMT = (MVB, GHX)
+KXG = (XCF, HKK)
+FBH = (XFT, LCC)
+SQG = (LTB, KVD)
+VMG = (BFM, PSF)
+FFP = (SSF, QJM)
+KVF = (JCS, GMR)
+HXS = (RLR, NPQ)
+PVM = (BMM, PTQ)
+JFD = (DLB, BJB)
+FTD = (BMP, XXL)
+JLK = (FMS, MCT)
+BGN = (JTG, NCV)
+KGH = (NPQ, RLR)
+QFL = (MBC, SQM)
+XNP = (JGM, PBC)
+DHN = (SPR, SNR)
+LJP = (JTG, NCV)
+KKX = (PKP, GTB)
+KKR = (KKC, SNM)
+DBG = (LKR, GTS)
+RCN = (FQQ, LLX)
+BKH = (RXD, LSC)
+HCD = (KDR, LGD)
+KVB = (JLS, TMH)
+SPC = (SXF, VLB)
+NKG = (XNS, VBK)
+FNN = (RMB, NPF)
+QNT = (SJD, KTM)
+RXK = (NKV, TMB)
+RDF = (FCJ, FST)
+XSS = (GKK, SQG)
+LRG = (SXR, CTX)
+FMS = (SMV, BQG)
+DVA = (DXR, JLB)
+JKQ = (KTP, RDF)
+LCC = (FHC, PKJ)
+LSD = (NKS, DPC)
+HHM = (BTG, NXB)
+XBQ = (QPF, TLF)
+JNM = (MPR, CDJ)
+TCB = (KXG, PJD)
+TBV = (RXK, RMR)
+KTP = (FCJ, FST)
+HSN = (VTX, NTJ)
+GDL = (XDT, RKG)
+FCJ = (DNQ, QJQ)
+DXR = (FFT, HNQ)
+RTB = (SVP, BQX)
+HLR = (DSC, SSR)
+LVL = (QML, TVP)
+KXQ = (RJP, DVV)
+BKN = (LXS, XMM)
+JHK = (FFR, QXX)
+DLS = (MKN, PTL)
+BTD = (CCP, NQV)
+JVG = (LMT, SKC)
+FFT = (LTR, PMD)
+XDD = (KRC, JBN)
+QNL = (BNV, NNN)
+LNK = (KDN, XTL)
+CMS = (DLS, VQG)
+TJD = (MCH, QTQ)
+LHR = (HNC, MLQ)
+FKS = (MPX, CVV)
+CCP = (XFP, XHT)
+QCX = (KQL, SPQ)
+KXP = (QXM, QXM)
+HHG = (FML, SHS)
+HDS = (KTS, CTF)
+BPG = (GMQ, NDD)
+QPR = (TFG, CDF)
+QCQ = (GGM, XSR)
+DFN = (KXQ, XCV)
+KRC = (FGX, XTP)
+RLR = (DDJ, KVN)
+PVX = (TGJ, XPJ)
+SVX = (MQN, QNJ)
+VQG = (PTL, MKN)
+GTM = (CFH, QGR)
+KVJ = (JLK, DDS)
+HHB = (TNH, LTG)
+BCB = (RVN, NHB)
+XTP = (HRX, VLQ)
+DJJ = (PGT, VCM)
+JQA = (CSK, SDR)
+PSR = (GLC, DQV)
+HDN = (CPC, GCF)
+VPX = (DJJ, KGD)
+BNR = (CTT, JGH)
+QRC = (XDD, SHB)
+VRX = (XNP, XHF)
+BTG = (QNS, QDL)
+RRP = (LJP, BGN)
+PFS = (RJB, QBG)
+BSB = (LKN, SBH)
+RXD = (SHQ, RHR)
+JJL = (VCK, RTB)
+RJP = (XKB, TDH)
+RCD = (DPT, FXX)
+PHQ = (PDH, KVF)
+DDL = (JSD, KFF)
+VBP = (DDN, KMB)
+GRD = (KVJ, FKH)
+CKQ = (NRV, VFG)
+KNM = (PTQ, BMM)
+XCD = (NXG, FSP)
+LGD = (VFC, SBM)
+RTD = (NXB, BTG)
+VCK = (SVP, BQX)
+GBC = (NHB, RVN)
+STP = (MQQ, KGJ)
+NKP = (RFM, JLF)
+JBN = (XTP, FGX)
+SBS = (RGK, HDS)
+RRQ = (FDM, CSB)
+FDM = (KSX, TFM)
+NXB = (QDL, QNS)
+NHB = (GHS, GDL)
+DQV = (FNJ, LVL)
+MBC = (HSN, CJM)
+QHK = (FVB, GSH)
+MDN = (KDR, LGD)
+FCP = (PBH, RHQ)
+NRL = (DXL, KXK)
+MSS = (SPQ, KQL)
+PBD = (SHH, PXM)
+JBB = (XKD, PSR)
+TVP = (PVQ, LDS)
+DKB = (TTQ, XNM)
+LSN = (FDM, CSB)
+XRD = (CQQ, CQQ)
+TGP = (MMV, BKN)
+NDD = (VCB, NSB)
+FSP = (KNM, PVM)
+CDM = (VSC, VSC)
+NXG = (PVM, KNM)
+SSF = (DBP, RQQ)
+RKJ = (TGP, RGN)
+SRF = (FJM, CPG)
+MSP = (RLC, RCD)
+BDQ = (RFR, DHN)
+DTR = (LBN, GRB)
+SHS = (SRF, QBT)
+LGT = (JHK, GBQ)
+BQG = (SBS, LHK)
+XVS = (SNM, KKC)
+TFG = (VSN, VSN)
+NTB = (HDN, KDD)
+HNQ = (PMD, LTR)
+PMF = (XCM, RPX)
+FLV = (NJP, FQM)
+PTQ = (PFS, XPF)
+XXQ = (PGB, TKK)
+PJL = (DQD, FBH)
+GHX = (JNM, DKL)
+GMR = (QFL, RQF)
+TFH = (DTR, HNK)
+KVM = (PGL, GTC)
+DPC = (XPT, PJH)
+KDD = (GCF, CPC)
+JMM = (FBH, DQD)
+XCF = (VPV, VPV)
+JLS = (HSC, DBG)
+GKT = (BKM, KSH)
+DNQ = (TFJ, HKR)
+PTA = (SMQ, RMD)
+XFV = (RKR, VJD)
+RKG = (LHR, NSJ)
+RPC = (JDD, HPK)
+HNK = (GRB, LBN)
+NSB = (VQD, JGD)
+HKR = (MQT, XHH)
+FKX = (BXX, RTN)
+BPD = (NRG, LPP)
+NJC = (RTB, VCK)
+QXX = (CKT, MRX)
+SFG = (DDL, QDD)
+FGV = (PSR, XKD)
+PJH = (NRJ, NVC)
+CPG = (STG, DLM)
+NPQ = (DDJ, KVN)
+SSR = (PCJ, HVX)
+XCV = (RJP, DVV)
+SMV = (LHK, SBS)
+PCJ = (FTK, HHN)
+RHX = (FDK, DBX)
+DXL = (XFV, PKV)
+RDM = (KMB, DDN)
+NFR = (QQP, CFG)
+VNG = (MSP, TKQ)
+QDL = (DSQ, QNT)
+HPV = (GTB, PKP)
+SBM = (QXB, RTX)
+RGQ = (SXF, VLB)
+NRV = (MFV, RPC)
+DFD = (GFG, KMH)
+RRV = (RDK, HSB)
+PBH = (QNL, HDC)
+MMV = (LXS, XMM)
+VVT = (RMR, RXK)
+RPX = (KXN, KCQ)
+LPP = (VFK, QHK)
+RLH = (NHF, JKV)
+TPP = (MCR, PQH)
+XPB = (TGJ, XPJ)
+FVL = (RNM, JCJ)
+KGJ = (HPN, HXB)
+GKK = (LTB, KVD)
+BGX = (TTS, PHD)
+BNJ = (KXK, DXL)
+KBQ = (HPV, KKX)
+NFS = (JMM, PJL)
+BXX = (JLG, LBB)
+TNH = (FCK, JMG)
+BJB = (DVC, HSL)
+KHB = (NDD, GMQ)
+SKX = (SSF, QJM)
+LTR = (PVX, XPB)
+FDK = (SSX, BGX)
+LBN = (FCC, GHR)
+STG = (DJM, RHX)
+KGD = (VCM, PGT)
+PDH = (JCS, GMR)
+MCC = (QLR, QLR)
+GKN = (TTQ, XNM)
+KKC = (SGS, BJN)
+JDG = (NPX, PKR)
+DXV = (KVF, PDH)
+PGT = (QQH, GPS)
+GGL = (JLS, TMH)
+LRH = (QGG, LQN)
+XDT = (LHR, NSJ)
+TFJ = (XHH, MQT)
+CKT = (FTD, VPL)
+QNM = (GPD, HFT)
+QQB = (HHG, DVH)
+LKX = (MQN, MQN)
+HFT = (CMT, ZZZ)
+GTC = (VGD, NLL)
+DFP = (MVB, GHX)
+NDP = (LKN, SBH)
+PJK = (VRX, TXL)
+GBQ = (QXX, FFR)
+BJN = (QQB, DMG)
+RCF = (TKQ, MSP)
+FCK = (NHP, LXR)
+HHN = (RFJ, KHX)
+XNS = (MBX, CPT)
+XFM = (SPC, RGQ)
+VTV = (FKH, KVJ)
+PXP = (NHM, QTX)
+FKN = (LPP, NRG)
+DLM = (DJM, RHX)
+BCQ = (TFG, TFG)
+RFR = (SPR, SNR)
+GPS = (NBG, MKL)
+FML = (SRF, QBT)
+JLB = (HNQ, FFT)
+DLB = (DVC, HSL)
+DMP = (CDM, XSL)
+VCM = (QQH, GPS)
+SKC = (MTR, RJJ)
+TQZ = (SDR, CSK)
+XHH = (CXS, QRC)
+KKF = (RCN, QCT)
+TDH = (BGT, TCB)
+DSC = (HVX, PCJ)
+CND = (XVN, PCV)
+QBT = (FJM, CPG)
+KCQ = (HFS, XFM)
+KFP = (PCV, XVN)
+MCH = (NLC, NNC)
+TGJ = (RKH, QHB)
+RTN = (LBB, JLG)
+XSL = (VSC, QNM)
+SMQ = (BVV, XTG)
+PQH = (XKJ, THP)
+XQP = (TXL, VRX)
+PQK = (DRQ, MLK)
+QNQ = (VQG, DLS)
+SJD = (JBB, FGV)
+XSR = (LLQ, GHV)
+CFJ = (NFV, FKX)
+RNM = (BVJ, FKM)
+FSS = (PLL, DSG)
+SSJ = (XTL, KDN)
+JGM = (VHN, JFV)
+RTM = (XSS, KMF)
+MLQ = (VPX, PPR)
+SBH = (GXD, LRH)
+ZZZ = (CNN, JDG)
+VTX = (QCQ, MJQ)
+KHX = (TVQ, HGJ)
+NPX = (FND, FLV)
+PKR = (FLV, FND)
+JGD = (VGS, TQJ)
+JGH = (DPQ, KVM)
+PFB = (DFP, MMT)
+LHK = (RGK, HDS)
+GMQ = (NSB, VCB)
+DJM = (FDK, DBX)
+JKH = (XRD, RBT)
+CGR = (KFP, CND)
+RSF = (KGJ, MQQ)
+GQT = (DDL, QDD)
+RNT = (PJL, JMM)
+PTL = (SDN, JNQ)
+NCV = (PBQ, CGX)
+KTM = (FGV, JBB)
+FBR = (CFJ, QLS)
+BFT = (PGB, TKK)
+TTS = (FDQ, PXP)
+GTB = (KGH, HXS)
+XFP = (FXG, PVN)
+SHQ = (BCQ, BCQ)
+VGD = (KXP, KXP)
+CSK = (XHC, JKQ)
+MLL = (NRL, BNJ)
+CFH = (SFG, GQT)
+BMM = (PFS, XPF)
+LKN = (LRH, GXD)
+HSL = (FBS, TPP)
+TMB = (TCT, HLG)
+CDJ = (XMS, JVC)
+FQQ = (RHD, QNG)
+TQQ = (BKM, KSH)
+PVQ = (GKN, DKB)
+QTZ = (FKN, BPD)
+DSQ = (KTM, SJD)
+TMH = (HSC, DBG)
+QHB = (FSS, HCN)
+CQQ = (SMQ, RMD)
+MBK = (GKT, TQQ)
+MMM = (RXQ, PFB)
+LSC = (SHQ, RHR)
+MQT = (CXS, QRC)
+PMD = (XPB, PVX)
+MMK = (QCT, RCN)
+TVJ = (RCF, VNG)
+FHB = (MLK, DRQ)
+QNJ = (BTD, QGZ)
+TVQ = (NXS, XCD)
+GLC = (FNJ, LVL)
+HFS = (RGQ, SPC)
+BJV = (FKS, KFM)
+SSX = (TTS, PHD)
+FXG = (LSN, RRQ)
+TQS = (TLF, QPF)
+QVB = (QLR, QVZ)
+BNV = (RTH, VRK)
+NXS = (NXG, FSP)
+KSH = (TDL, FSC)
+HPK = (KVB, GGL)
+KKV = (FNN, BRK)
+XHC = (RDF, KTP)
+LQN = (BJV, GJC)
+GPD = (CMT, CMT)
+HRX = (LGQ, TKJ)
+CSB = (KSX, TFM)
+XPT = (NRJ, NVC)
+QTQ = (NNC, NLC)
+VPV = (MCC, MCC)
+TDL = (SCN, SCN)
+CTT = (DPQ, KVM)
+JFV = (GQG, MHX)
+GFG = (GNG, NDL)
+MKL = (TVJ, SSM)
+XKB = (TCB, BGT)
+XRV = (CFG, QQP)
+CRA = (BPD, FKN)
+VSC = (GPD, GPD)
+RGS = (FNN, BRK)
+MFV = (JDD, HPK)
+GGM = (GHV, LLQ)
+FKJ = (JKV, NHF)
+GCF = (KFS, RTM)
+JSD = (MDN, HCD)
+SXR = (XCN, JVG)
+LMF = (MXP, FVH)
+AAA = (JDG, CNN)
+MJT = (RXQ, PFB)
+PJD = (XCF, HKK)
+RDD = (NKS, DPC)
+DPT = (HVV, GTM)
+NHM = (QCX, MSS)
+MQQ = (HXB, HPN)
+FLL = (RKS, RRV)
+BRK = (RMB, NPF)
+FHC = (BSB, NDP)
+RHR = (BCQ, QPR)
+NNC = (JJL, NJC)
+LKR = (XQP, PJK)
+CDF = (VSN, QTZ)
+MRX = (FTD, VPL)
+PLT = (DTR, HNK)
+VLQ = (TKJ, LGQ)
+GJC = (KFM, FKS)
+MQN = (BTD, BTD)
+GHR = (MFT, NRB)
+XXL = (FBR, DSJ)
+NHF = (XVS, KKR)
+LDS = (DKB, GKN)
+PKV = (RKR, VJD)
+KPC = (RPX, XCM)
+NRJ = (DPN, CNF)
+BGA = (CCP, NQV)
+LCK = (DSC, SSR)
+KFM = (MPX, CVV)
+RMB = (FCP, VLM)
+XKJ = (FMV, GCN)
+NBG = (SSM, TVJ)
+QPF = (VKH, QLQ)
+RKH = (HCN, FSS)
+HGJ = (XCD, NXS)
+RGN = (MMV, BKN)
+HCN = (DSG, PLL)
+RFM = (CCF, JNJ)
+DRQ = (KKF, MMK)
+XKD = (DQV, GLC)
+NXK = (KXQ, XCV)
+FTK = (RFJ, KHX)
+QQH = (MKL, NBG)
+HSB = (NKP, JGJ)
+GSH = (TQS, XBQ)
+CTF = (CPB, DMP)
+GCR = (RNM, JCJ)
+CCF = (XRT, JFD)
+DSG = (BCB, GBC)
+XCN = (SKC, LMT)
+PLL = (GBC, BCB)
+VKH = (HFR, VMN)
+PBQ = (MJT, MMM)
+PSF = (LKX, SVX)
+LMG = (MXP, FVH)
+BMP = (FBR, DSJ)
+GXD = (LQN, QGG)
+XMS = (PKX, CGR)
+RLC = (DPT, FXX)
+NRB = (BNR, TFN)
+VPL = (XXL, BMP)
+PCV = (VVM, NTB)
+QGR = (SFG, GQT)
+PHD = (PXP, FDQ)
+NQV = (XFP, XHT)
+LGQ = (RTD, HHM)
+CNN = (NPX, PKR)
+CPT = (CST, CKQ)
+BGT = (KXG, PJD)
+THP = (GCN, FMV)
+QGG = (BJV, GJC)
+KSX = (LGT, TXS)
+BKM = (TDL, FSC)
+FXX = (HVV, GTM)
+KMF = (SQG, GKK)
+FCC = (MFT, NRB)
+NDL = (FKJ, RLH)
+TFM = (TXS, LGT)
+LMX = (FRT, LRG)
+FFR = (MRX, CKT)
+KXK = (PKV, XFV)
+JNJ = (XRT, JFD)
+DMG = (HHG, DVH)
+TCT = (NCP, KBQ)
+MXP = (SDD, LMX)
+FSC = (SCN, JKH)
+VFS = (VMG, LXF)
+RBT = (CQQ, JXZ)
+RXV = (QXM, TQZ)
+RKS = (HSB, RDK)
+FND = (FQM, NJP)
+XPF = (QBG, RJB)
+LFT = (XXQ, BFT)
+HVX = (HHN, FTK)
+RTX = (NXK, DFN)
+QNG = (XRV, NFR)
+NFV = (RTN, BXX)
+KQL = (RGS, KKV)
+MTR = (TFH, PLT)
+QNS = (QNT, DSQ)
+SHB = (KRC, JBN)
+SVP = (FFP, SKX)
+VLM = (PBH, RHQ)

2023/go/day09/day09.go

@@ -0,0 +1,71 @@
+package day09
+
+import (
+	_ "fmt"
+	"strings"
+	
+	"adventofcode2023/utils/inputs"
+
+)
+
+func Part1(input string) int {
+	ins := parseInput(input)
+	ans := 0 
+	for _, in := range ins {
+		ans += f1(in)
+	} 
+	return ans
+}
+
+func Part2(input string) int {
+	ins := parseInput(input)
+	ans := 0 
+	for _, in := range ins {
+		reverse(in)
+		ans += f1(in)
+	} 
+	return ans}
+
+func f1(in []int) int {
+	out := []int{}
+	for i:=0;i<len(in)-1;i++{
+		out = append(out, in[i+1] - in[i])
+	}
+	if allZero(out) {
+		return in[len(in) -1]
+	} else {
+		return in[len(in) -1] + f1(out)
+	}
+}
+
+func reverse(nums []int) {
+    for i, j := 0, len(nums)-1; i < j; i, j = i+1, j-1 {
+        nums[i], nums[j] = nums[j], nums[i]
+    }
+}
+
+func allZero(in []int) bool {
+	for _, v := range in {
+		if v != 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func diff(in []int) []int {
+	out := []int{}
+	for i:=0;i<len(in)-1;i++{
+		out = append(out, in[i+1] - in[i])
+	}
+	return out
+}
+
+func parseInput(input string) ([][]int) {
+	lines := strings.Split(input, "\n")
+	out := [][]int{}
+	for _, line := range lines {
+		out = append(out, inputs.ToInts(line, " "))
+	}
+ 	return out
+}

2023/go/day09/day09_test.go

@@ -0,0 +1,23 @@
+package day09
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45`)
+	require.Equal(t, 114, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45`)
+	require.Equal(t, 2, r)
+}

2023/go/day09/input.txt

@@ -0,0 +1,200 @@
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+3 18 39 62 84 110 166 321 721 1638 3537 7164 13658 24690 42632 70759 113487 176650 267819 396666 575376
+23 33 49 79 132 217 335 464 539 441 41 -595 -643 2719 16711 57254 156427 375417 827593 1720891 3437190
+7 24 50 85 142 258 514 1069 2207 4385 8261 14704 24907 41055 68751 123960 250328 558763 1312713 3104284 7206249
+-7 -1 21 79 208 466 962 1919 3787 7421 14339 27075 49642 88120 151384 251987 407213 640315 981953 1471847 2160660
+-7 -4 0 6 17 40 94 224 527 1208 2702 5922 12723 26708 54544 108004 207005 383972 689924 1202750 2038221
+18 29 55 112 225 446 901 1884 4033 8657 18343 38083 77387 154338 303618 592833 1156238 2264577 4468621 8890194 17802535
+13 27 43 70 138 306 667 1350 2519 4369 7119 11002 16252 23088 31695 42202 54657 68999 85027 102366 120430
+1 14 48 125 277 551 1022 1814 3129 5284 8756 14235 22685 35413 54146 81116 119153 171786 243352 339113 465381
+-1 8 23 44 71 104 143 188 239 296 359 428 503 584 671 764 863 968 1079 1196 1319
+19 43 77 127 215 395 790 1669 3597 7724 16343 33959 69302 139053 274682 535059 1030155 1966898 3740787 7123974 13657889
+18 45 91 164 275 438 677 1048 1684 2871 5163 9544 17645 32024 56517 96668 160246 257857 403659 616188 919303
+6 22 59 136 291 594 1160 2162 3844 6534 10657 16748 25465 37602 54102 76070 104786 141718 188535 247120 319583
+23 37 65 118 212 377 687 1329 2735 5816 12367 25768 52224 103069 199356 381630 731614 1420871 2818778 5726452 11868843
+13 24 32 38 55 126 345 876 1970 3996 7534 13631 24400 44252 82197 155837 297907 566504 1060484 1941908 3467885
+9 11 8 7 38 173 559 1479 3462 7483 15333 30296 58341 110127 204263 372559 668647 1182699 2067602 3586753 6201896
+18 44 92 182 354 678 1272 2352 4352 8165 15568 29905 57112 107177 196136 348713 601718 1008322 1643332 2609592 4045638
+-6 -2 12 37 85 189 422 952 2183 5066 11718 26576 58470 124296 255549 510096 993680 1899506 3581116 6685619 12394363
+10 18 40 85 167 323 635 1262 2502 4919 9598 18672 36477 72155 145400 298517 620281 1290667 2661351 5397302 10725062
+8 7 10 36 112 276 581 1096 1900 3059 4565 6212 7427 7257 5226 4991 25352 128511 485816 1520388 4200090
+6 1 -4 -9 -14 -19 -24 -29 -34 -39 -44 -49 -54 -59 -64 -69 -74 -79 -84 -89 -94

2023/go/day10/day10.go

@@ -0,0 +1,306 @@
+package day10
+
+import (
+	"fmt"
+
+	"adventofcode2023/utils"
+	"adventofcode2023/utils/grid2d"
+	"adventofcode2023/utils/inputs"
+)
+
+type Coord struct {
+	x int
+	y int
+}
+
+type Direction struct {
+	dir string
+	x int
+	y int
+}
+
+func Part1(input string) int {
+	grid := inputs.ToGrid2D(input, "\n", "", ".", func(c string) string { return c})
+	start, _ := findStart(grid)
+	tunnel := findTunnel(grid, start)
+	fmt.Println(start)
+	return len(tunnel)/2
+}
+
+func Part2(input string) int {
+	grid := inputs.ToGrid2D(input, "\n", "", ".", func(c string) string { return c})
+	start, _ := findStart(grid)
+	tunnel := findTunnel(grid, start)
+	maskJunkPipes(grid, tunnel)
+	bigGrid := expand(grid)
+	floodFill(bigGrid, Coord{0,0})
+	return countTiles(bigGrid, tunnel)
+}
+
+func floodFill(grid *grid2d.Grid[string], coord Coord) {
+    // Base cases to stop recursion
+	if coord.x < 0 || coord.x >= grid.SizeX() || coord.y < 0 || coord.y >= grid.SizeY() {
+		return
+	}
+
+    if grid.Get(coord.x, coord.y) != "." || grid.Get(coord.x, coord.y) == "O" {
+        return
+    }
+
+    // Change the color of the current pixel
+    grid.Set(coord.x, coord.y, "O")
+
+    // Recursively call floodFill for neighboring pixels
+    floodFill(grid, Coord{coord.x+1, coord.y})
+    floodFill(grid, Coord{coord.x-1, coord.y})
+    floodFill(grid, Coord{coord.x, coord.y+1})
+    floodFill(grid, Coord{coord.x, coord.y-1})
+}
+
+// Magnify grid
+
+//		+-
+// F => |
+//
+// L => |
+//		+-
+//
+//      |
+// | => |
+//      |
+
+
+func findTunnel(grid *grid2d.Grid[string], start Coord) []Coord {
+	directions := []Direction{{"s", 0, 1}, {"n", 0, -1}, {"e", 1, 0}, {"w", -1, 0}}
+	steps := 0
+	current := start
+	last := Direction{}
+	tunnel := []Coord{}
+	tunnel = append(tunnel, start)
+	for {
+		for _, dir := range directions {
+			if dir == oposite(last) { continue }
+			x := current.x + dir.x
+			y := current.y + dir.y
+			if x < 0 || x >= grid.SizeX() || y < 0 || y >= grid.SizeY() {
+				continue
+			}
+			if ! possible(dir, grid.Get(current.x, current.y) ) { continue }
+			pipe := grid.Get(x, y)
+			if pipe == "S" { 
+				return tunnel
+			}	
+			switch dir.dir {
+			case "n":
+				if pipe == "|" || pipe == "F" || pipe == "7" {
+					current = Coord{x, y}
+					steps++
+					last = dir
+					tunnel = append(tunnel, current)
+					if current == start { return tunnel }
+				}
+			case "s":
+				if pipe == "|" || pipe == "L" || pipe == "J" {
+					current = Coord{x, y}
+					steps++
+					last = dir
+					tunnel = append(tunnel, current)
+					if current == start { return tunnel }
+				}
+			case "e":
+				if pipe == "-" || pipe == "J" || pipe == "7" {
+					current = Coord{x, y}
+					steps++
+					last = dir
+					tunnel = append(tunnel, current)
+					if current == start { return tunnel }
+				}
+			case "w":
+				if pipe == "-" || pipe == "F" || pipe == "L" {
+					current = Coord{x, y}
+					steps++
+					last = dir
+					tunnel = append(tunnel, current)
+					if current == start { return tunnel }
+				}
+			}
+					
+		}
+	}
+}
+
+func expand(grid *grid2d.Grid[string]) *grid2d.Grid[string] {
+	bigGrid := grid2d.NewGrid(grid.SizeX() * 3, grid.SizeY() * 3, ".")
+	for y:=0;y<grid.SizeY();y++ {
+		for x:=0;x<grid.SizeX();x++ {
+			switch grid.Get(x, y) {
+			case "F":
+				bigGrid.Set(x*3+1,y*3+1,"+")
+				bigGrid.Set(x*3+2,y*3+1,"-")
+				bigGrid.Set(x*3+1,y*3+2,"|")
+			case "L":
+				bigGrid.Set(x*3+1,y*3,"|")
+				bigGrid.Set(x*3+1,y*3+1,"+")
+				bigGrid.Set(x*3+2,y*3+1,"-")
+			case "|":
+				bigGrid.Set(x*3+1,y*3,"|")
+				bigGrid.Set(x*3+1,y*3+1,"|")
+				bigGrid.Set(x*3+1,y*3+2,"|")
+			case "7":
+				bigGrid.Set(x*3,y*3+1,"-")
+				bigGrid.Set(x*3+1,y*3+1,"+")
+				bigGrid.Set(x*3+1,y*3+2,"|")
+			case "-":
+				bigGrid.Set(x*3,y*3+1,"-")
+				bigGrid.Set(x*3+1,y*3+1,"-")
+				bigGrid.Set(x*3+2,y*3+1,"-")
+			case "J":
+				bigGrid.Set(x*3+1,y*3,"|")
+				bigGrid.Set(x*3+1,y*3+1,"+")
+				bigGrid.Set(x*3,y*3+1,"-")
+			case "X":
+				bigGrid.Set(x*3+1,y*3+1,"X")
+			case "S":
+				bigGrid.Set(x*3+1,y*3+1,"*")
+			default:
+				bigGrid.Set(x*3+1,y*3+1,".")
+			}
+		}
+	}
+	return bigGrid
+}
+func maskJunkPipes(grid *grid2d.Grid[string], tunnel []Coord) {
+	for y:=0;y<grid.SizeY();y++ {
+		for x:=0;x<grid.SizeX();x++ {
+			if ! containsCoord(Coord{x, y}, tunnel) && grid.Get(x, y) != "." {
+				grid.Set(x, y, ".")
+			}
+		}
+	}
+}
+
+func countTiles(grid *grid2d.Grid[string], tunnel []Coord) int {
+	count := 0
+	tiles := []Coord{}
+	directions := []Coord{{0,1}, {0,-1},{1,0}, {-1, 0},{1,1},{1,-1},{-1,1},{-1,-1}}
+	for y:=0;y<grid.SizeY();y=y+3 {
+		for x:=0;x<grid.SizeX();x=x+3 {
+			coord := Coord{x, y}
+			if coord.x == 0 || coord.x == grid.SizeX() - 1 || coord.y == 0  || coord.y == grid.SizeY() - 1  {
+				continue
+			}
+			found := true
+			if grid.Get(coord.x, coord.y) == "." {
+				for _, dir := range directions {
+					if grid.Get(coord.x+dir.x, coord.y+dir.y) != "." {
+						found = false
+						continue
+					}
+				}
+				if found {
+					count++
+					tiles = append(tiles, coord)
+					grid.Set(coord.x, coord.y, "I")
+				}
+			}
+		}
+	}
+//	fmt.Println(grid.StringWithFormatter(func(c string, x int, y int) string { return c}))
+	return count
+}
+
+func containsCoord(coord Coord, tunnel []Coord) bool {
+	for _, v := range tunnel {
+		if v == coord {
+			return true
+		}
+	}
+	return false
+}
+
+func maxX(tunnel []Coord) int {
+	max := 0
+	for _, v := range tunnel {
+		if v.x > max {
+			max = v.x
+		}
+	}
+	return max
+}
+func minX(tunnel []Coord) int {
+	min := utils.MaxInt
+	for _, v := range tunnel {
+		if v.x < min {
+			min = v.x
+		}
+	}
+	return min
+}
+func maxY(tunnel []Coord) int {
+	max := 0
+	for _, v := range tunnel {
+		if v.y > max {
+			max = v.y
+		}
+	}
+	return max
+}
+func minY(tunnel []Coord) int {
+	min := utils.MaxInt
+	for _, v := range tunnel {
+		if v.y < min {
+			min = v.y
+		}
+	}
+	return min
+}
+
+func possible(dir Direction, pipe string) bool {
+	v := false
+	if pipe == "S" { return true }
+	switch dir.dir {
+	case "n":
+		if pipe == "|" || pipe == "L" || pipe == "J" {
+			v = true
+		}
+	case "s":
+		if pipe == "|" || pipe == "F" || pipe == "7" {
+			v = true
+		}
+	case "e":
+		if pipe == "-" || pipe == "F" || pipe == "L" {
+			v = true
+		}
+	case "w":
+		if pipe == "-" || pipe == "J" || pipe == "7" {
+			v = true
+		}
+	}
+	return v
+}
+
+func findStart(grid *grid2d.Grid[string]) (Coord, error) {
+//	for j := 0; j < grid.SizeY(); j++ {
+//		for i := 0; i < grid.SizeX(); i++ {
+//			if grid.Get(i, j) == "S" {
+//				return Coord{i, j}, nil
+//			}
+//		}
+//	}
+//	return Coord{}, fmt.Errorf("S not found")
+	return Coord{x:74, y:95}, nil
+}
+
+func oposite(dir Direction) Direction {
+	switch dir.dir {
+	case "n":
+		return Direction{"s", 0, 1}
+	case "s":
+		return Direction{"n", 0, -1}
+	case "e":
+		return Direction{"w", -1, 0}
+	case "w":
+		return Direction{"e", 1, 0}
+	}
+	return Direction{}
+}

2023/go/day10/day10_test.go

@@ -0,0 +1,32 @@
+package day10
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`..F7.
+.FJ|.
+SJ.L7
+|F--J
+LJ...`)
+	require.Equal(t, 8, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`.F----7F7F7F7F-7....
+.|F--7||||||||FJ....
+.||.FJ||||||||L7....
+FJL7L7LJLJ||LJ.L-7..
+L--J.L7...LJF7F-7L7.
+....F-J..F7FJ|L7L7L7
+....L7.F7||L7|.L7L7|
+.....|FJLJ|FJ|F7|.LJ
+....FJL-7.||.||||...
+....L---J.LJ.LJLJ...`)
+	require.Equal(t, 8, r)
+}

2023/go/day10/input.txt

@@ -0,0 +1,140 @@
+FL7L-F7FJF-7FFF7FF|-F-F|JF--|.|-J-7.F--FJF|-7.F.-FF7.-F7-L-|FF-F-|-7.-F7-FF-|7J-J.F-J7.FF7..L7F|7F-7JF-L7F.|--FL7F---|.FFF-L7FL--L777L-.FF7F
+7FFJ.FLJF-.FJ||F-FJJJJ||F|-F7FLJ.7-F7J||-FFF7.L7-FJL7.F|||-J7JJ.LL77F|LF7LJJ||L7--|-7F-F|F-7JLJ.LJL--F-|LLJ|7J|L|-|7|FF|7|J.LJFFJ7.|-J.F.|L|
+L-77.L77JF-JF7.||||.F7FFF7-|-7L.L--|.FF.|F-JL77.|L-7|F7|-|7F|-.-7L-F7--JJ|.||L7L-.|JF|.|JL-77F-|J-L|JL--FLJLJ7JF|7||7.FJL|7--L|---7|.|FF-J-|
+LF7--FFJFLJLFL|J|.77---J-F-|F7-7.|7.L|J--L--7L7F7F7|LJL7-77-L.--J7LL-7.|LF-J--.F-J7-F--L7|-F7LFJ--77-7.77LJJ.7FL.J-JFJJ|F|J|LF|7||F|7FFJL|LJ
+L|J7.-JJ-.|F|FJJJL||FL77LJ.|FJ7|FL7F.L7JJFLFJFJ|LJLJF--J-F7...FF||.FJL.-7L|.FL7JJLL-JJ.|||F||.L7|JFJ.|FJ7|--7JJ-|7LLF-FJ-F.--FJF|-LJFLJ-J.FJ
+FJF-L-|.LF-F||J-7.-7|FF7-77J-7|LLJ|JJLJ--7-L7|JL-7F-JF-7.||7F-JJF7.J7.||L.--JJ.---77L7--777||7FLJFJJ-|7||F-L|-J7LJ-FJL|J.|.F77.L|F|JFJ|7.FF7
+|-FJ.-F7.F..L|LF|7---LL77|L7FJJ.L.|LF-JFF|-FJ|F--JL-7|FJFJ|-7JLL||F7FL.JLLJ..F.L--LF7L.LF-7|L77J.FL7.FFLF--FF.L|7|.J|FJFL|-|7-7|F|7-J..777|F
+F77.F|L77LFF-|LJ-L7|-LJ|F|.--7|.L--F-|7-L7.L7|L--7F-J|L-JFJFJJ-|JFF-7---FJ..-77||7.F7||-L7LJFJ77F7JLFF7L|7|||L7||7-J-|7-.|.L|.LJ.|LJJ.FLL-L7
+|.|--F-J-7L7-FF|---7-|.J7JF.LFL-J.||LF-J.F--J|LF-JL7FJF7FJ77|F7--FL7|-L7-77F7F---7-||F7F7L-7|JLF77-L|||F-7-|JLJJLL7FF...JL-J.77|FJ.|.77|L-|J
+-F7FLJ|LF7.|.L-LJ.LJ..F|..F.L-|.F-J77|F-7L--7L7L--7LJFJ|L7F777J|.F-JL7LJ---L7L--7|FJ||||L7FJL7.|L7-F7|||FJ7L|J.L|LJ7JF77L.|FLJ7-7FF7|77|.F-7
+J.-77LF7||F77FJ-7.|L7F-7-.F7.|F7JJ-F7J7LF7F7L7L7F7|F7L7L-J||F7-JFL7F7|--7L|LF---J||FJ||L7|L7FJF|FJF|LJLJL-7L7|F7|FLL7LLJ77LJ7|.FJ-J||L7J.JF-
+|.LL-.LLL-|L-7|---L-7.LL.FL7.FJ||.F-7|F7||||JL7|||||L-JFF-J|||.F7FJ|LJ7F7-JLL7F-7|||FJL7|L7|L--JL-7L-7F---JF|7LF-LJFL-J-LLJF---FJ.F|LJJ.JJLJ
+L||L|7.L7LL77LJ.F|J7|7||7|7J|.|--FL7L-JLJ|||F7|||LJ|F7F7L7FJ||FJ|L7L7F7|L7J-FLJFJLJLJF-J|FJ|F--7F-JF-JL--7L--L7JFJ.L|L|FL7.JJ-||J-7-|JFJ.FF|
+|JF7LL-.|7-|77.-F|LF--FJ-JF7F77FFLJL----7LJLJLJ|L7FJ||||FJL7|LJFJ-|FJ|||FJ|--LFJF---7|F7|L7|L7-LJF7|F--7FJ.JJ7F7|.J-J7-7-F-|..FJF-.J.LJJ-F7.
+F7.|-|.FF7L|.L7||..|.|.JFF|LJ|F7J-F-7F7JL-----7L-JL-J||||F-JL-7L7FJ|FJ|||F77.LL-JF--JLJLJFJL7L-7-||LJF7||F7|.F||77|.|L7L-L.F-F-LLJ7.FF-|.L--
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+.J-J.|JLF|F|7F|.JLJ|.F-7|FF-J||LJ|JL-7F7LJ|FJ|F--JL7|FJ||||||L7|LJ|FJ|FJ||L7|LJL-7F7FJL7JFJLJL-7|FJ|||||F--JF7||||JFL-J-J.-7-|F-|-|7L-F.J--J
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+|7LF77-J-L-.|L||.L7|-|F|-LLJL-7L77L7|F-7L|||L-7|||L7L-J||||L-JL-JL-7|||L7|L-7LF7L-7L--JFJF7|FJL7|||FJ|||F-JL7||||FJ|L--777J.F---J7L|J7-7-FJ7
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+|F7-JFJ-FLFJ.FJL-7J--LJ|FF|LJLJL7|LJ||L7L---7|.F7-FJL7F7|||L7FJ|LJLJL-7|-||F7L7|||LJF7L7|L--7|F7||L7||||L7|||||F---7|F7F-777.77L|J7L-J-FF--J
+LJ|7.FJ.|.F7F|.77|J.F|J|--|F---7LJF-J|FJ7F7FJ|FJ|FJF7LJ||||FJL7|F7|F7FJL7|LJ|FJ||L--JL-JL7F7|||||L-JLJLJFJ||||||LF7LJ|LJFJL7-7JL|LFJF|LFJ7|7
+F-|JF|JFLJJ-77.L|J|F|-F7FFLJF7LL-7L7J|L7FJ|L7|L7|L-J|F7||LJL77LJ||FJ|L7FJ|F-JL7|L-------7LJLJLJLJF------JF|LJLJL-J|F7|F7L-7JF|7.7JF-FJ||F-JL
+F-J7L.F|J7.|L-7F-J-7JFJ|F7F-J|F-7L7L7|FJL7L-JL7||F--J|LJL7F7L-7F|||FJFJL7|L7F7||F-7F-7F7L---7F---JF7F-7F-7|F--7F--J||||L--J|FJF-7-J-|JLJJ-7J
+L7L-7.J7--.|--77F7FL-L7|||L-7LJFJ|L7LJ|JJL---7|||L--7L7F7||L--JFJ|||JL-7LJFJ|LJ|L7|L7|||F-7-|L---7||L7||FJ||F7LJFF7||||F--7FJ-|FJ|J.|.L|J.|7
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2023/go/day11/day11.go

@@ -0,0 +1,146 @@
+package day11
+
+import (
+	"adventofcode2023/utils"
+	_ "fmt"
+	"strings"
+)
+
+type Galaxy struct {
+	x int
+	y int
+}
+
+func Part1(input string) int {
+	galaxies := []Galaxy{}
+	lines := strings.Split(input, "\n")
+	var expand_rows []int
+	var expand_cols []int
+	for y,line := range lines {
+		for x,char := range line {
+			if char == '#' {
+				galaxies = append(galaxies, Galaxy{x, y})
+			}
+		}
+	}
+	// fmt.Println(galaxies)
+	for y,line := range lines {
+		no_galaxy := true
+		for _,char := range line {
+			if char != '.' {
+				no_galaxy = false
+				break
+			}
+		}
+		if no_galaxy {
+			expand_rows = append(expand_rows, y)
+		}
+	}
+	for x:=0;x<len(lines[0]);x++ {
+		no_galaxy := true
+		for _,line := range lines {
+				if line[x] != '.' {
+					no_galaxy = false
+					break
+				}
+		}
+		if no_galaxy {
+			expand_cols = append(expand_cols, x)
+		}
+	}
+	galaxies = expand_row(expand_rows, galaxies, true)
+	galaxies = expand_col(expand_cols, galaxies, true)
+//	fmt.Printf("r: %v c: %v\n%v\n", expand_rows, expand_cols, galaxies)
+	dist := 0
+	for i:=0;i<len(galaxies)-1;i++{
+		g1 := galaxies[i]
+		for _, g2 := range galaxies[i+1:] {
+			dist = dist + distance(g1, g2)
+		}
+	}
+	return dist
+}
+
+func Part2(input string) int {
+	galaxies := []Galaxy{}
+	lines := strings.Split(input, "\n")
+	var expand_rows []int
+	var expand_cols []int
+	for y,line := range lines {
+		for x,char := range line {
+			if char == '#' {
+				galaxies = append(galaxies, Galaxy{x, y})
+			}
+		}
+	}
+//	fmt.Println(galaxies)
+	for y,line := range lines {
+		no_galaxy := true
+		for _,char := range line {
+			if char != '.' {
+				no_galaxy = false
+				break
+			}
+		}
+		if no_galaxy {
+			expand_rows = append(expand_rows, y)
+		}
+	}
+	for x:=0;x<len(lines[0]);x++ {
+		no_galaxy := true
+		for _,line := range lines {
+				if line[x] != '.' {
+					no_galaxy = false
+					break
+				}
+		}
+		if no_galaxy {
+			expand_cols = append(expand_cols, x)
+		}
+	}
+	galaxies = expand_row(expand_rows, galaxies, false)
+	galaxies = expand_col(expand_cols, galaxies, false)
+//	fmt.Printf("r: %v c: %v\n%v\n", expand_rows, expand_cols, galaxies)
+	dist := 0
+	for i:=0;i<len(galaxies)-1;i++{
+		g1 := galaxies[i]
+		for _, g2 := range galaxies[i+1:] {
+			dist = dist + distance(g1, g2)
+		}
+	}
+	return dist
+}
+
+func expand_row(rows []int, galaxies []Galaxy, partOne bool) []Galaxy {
+	new := []Galaxy{}
+	for _,galaxy := range galaxies {
+		new = append(new, Galaxy{galaxy.x, galaxy.y + howMany(rows, galaxy.y, partOne)})
+	}
+	return new
+}
+
+func expand_col(cols []int, galaxies []Galaxy, partOne bool) []Galaxy {
+	new := []Galaxy{}
+	for _,galaxy := range galaxies {
+		new = append(new, Galaxy{galaxy.x  + howMany(cols, galaxy.x, partOne), galaxy.y})
+	}
+	return new
+}
+
+func howMany(xs []int, a int, partOne bool) int {
+	count := 0
+	incr := 1
+	if !partOne { incr = 1000000 - 1 }
+	for _,x := range xs {
+		if x < a {
+			count = count + incr
+		}
+	}
+	return count
+}
+
+func distance(g1 Galaxy, g2 Galaxy) int {
+	val := utils.Abs(g1.x - g2.x) + utils.Abs(g1.y - g2.y)
+//	fmt.Printf("%v - %v = %v\n", g1, g2, val)
+	return val
+}

2023/go/day11/day11_test.go

@@ -0,0 +1,38 @@
+package day11
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....`)
+	require.Equal(t, 374, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....`)
+			require.Equal(t, 8410, r)
+	require.Equal(t, 0, r)
+}

2023/go/day11/input.txt

@@ -0,0 +1,140 @@
+.......#...........................................................................#........................................................
+.............#...........#..................#.............................................................#..............#.......#..........
+..................................................................#.........#......................................#........................
+.................#...........................................................................................................#..............
+.............................................................#..............................................................................
+......................#.....................................................................#............................................#..
+.....#...........................................#..........................................................................................
+............................#..........................................#...............................#....................................
+...........#......................................................................................#......................#..................
+....................................................#.....#................................................#......................#.........
+#..................................................................#.............#...........................................#..............
+......................................#..................................................#...............................................#..
+.................................#..........................................................................................................
+...............#........#..............................................#...............................................#....................
+.......#....................................................................................................................................
+............................................................................#...................#..................#.......#.........#......
+...................#......................#......#.......#.......#..........................................................................
+............#...........................................................................#................#..................................
+.....................................................#..................#................................................................#..
+.............................#.....#..........................................................................#...................#.........
+...#.......................................................#...............................#................................................
+............................................#........................................................#......................................
+...................................................................#..................................................................#.....
+..........................................................................................................................#.................
+#.......................#............................#.......................................#..............................................
+..........................................#.................#.....................................#................................#........
+..................#............................................................#........................#..............#....................
+............................................................................................................................................
+......#........................................................................................#.............................#..............
+...............#........................#.........#.....#......#...................#..............................#.........................
+.........................#.....#..........................................#.................................................................
+.................................................................................................................................#..........
+...........................................................#..................................................#..........#............#.....
+.............#.................................................................#............................................................
+.....................#............#..............#.......................................#..................................................
+#..........................#...........................#..................................................#.................................
+.............................................................#....................................................................#.......#.
+......................................................................................................................#.....................
+............#..................#...........#........#...............................#..............#...........#............................
+.......#..............................#.....................................................................................................
+........................#...............................................................#..............#.................#.............#....
+.#..........................................................................................................#...............................
+.........................................................#.....................#.................................................#..........
+..........................................#..........................................#...........................#.........................#
+.....#..........................#.................#..........#........#.....................................................................
+..........#...........#.................................................................................#...................................
+.............................................................................................................................#.......#......
+..........................................................#.................#............#..................................................
+.....................................................#..........................................#...........#...............................
+.......................................#...............................#.............................#......................................
+..................................#...............................................#........................................#.............#..
+.......#.......#.......#..........................................#.........................................................................
+.............................................#...............#..............................................................................
+............................#................................................................#..............................................
+........................................................#..................#.............................#........................#.........
+...................................................................................................#..........#.............................
+......#............................................................................#....................................#..................#
+..................#.....#...............#.....#......#...................................#.....................................#............
+..................................................................#...........#.............................................................
+#.............#..........................................#...............#...................#.........#....................................
+........#.............................................................................................................#.............#.......
+......................#......................................#............................................................................#.
+..............................#....................................................#........................................................
+............................................................................................................................................
+...............#.............................................................................................#..............................
+........................#............#............................#................................................................#........
+...#.....................................................#................#..............#...................................#..............
+.............................................#..............................................................................................
+...........................#................................................................................................................
+.....................................................#......#....................................................#.....#....................
+.....#....................................#.....#...........................#...................#...........................................
+..............#.....................#...................................................................#...................................
+#........................................................................................#..................................................
+.....................#........................................................................................#.............................
+..........................#.......................#..................................................................................#......
+.........#................................................#.........#.......................................................#...............
+...............................#................................................................#.....#.....................................
+...................#..........................#.................#..................#..............................................#.........
+......#......#..............................................................................................................................
+............................#......................................................................#........#...............................
+....................................................................................................................#.......................
+................................................#...........#.................#........................#....................................
+.................#..........................................................................................................................
+..........................#......................................................................................#..........#..........#....
+#...............................................................................................#.....................#.....................
+............#......................#...................#.................................#.........................................#........
+............................................................................................................................................
+....................................................................#.......................................................................
+.....#........................................#...........................................................#...................#.............
+..........................................................#..................................#..............................................
+.............................#............................................#.................................................................
+......................#............................................................................................................#........
+..#.....................................................................................................................................#...
+...........#..........................#............................................................................#........................
+..............................................#.................#....................#...............#........#.............................
+...........................#...........................#......................................#...........................#.....#...........
+.........................................................................................................#..................................
+.........#......#................................................................................................#........................#.
+...#.....................................................................#..............#...................................................
+.............................#......#...............................#................................................#......................
+.........................................#............................................................................................#.....
+.....................#............................#............#.................#...........................#...............#..............
+.............#..........................................#...................................#...............................................
+..#.............................#...........................................#.....................#................#........................
+...........................................#...........................#.................................................#..............#...
+........#...........................#.......................#.......................#.......................................................
+...........................#.............................................................................#.......................#..........
+............................................................................................................................................
+...............#...............................................................................#..........................................#.
+............................................................................................................................................
+#...............................................#......#.......#...............#............................................................
+.........#.................................#...........................................................#....................................
+......................................#............................#...............................................#........................
+......................#.........#.............................................................................#.............................
+....................................................................................#............#..........................................
+..........................................................................#...............#.................................................
+...........#.....#................................#.........................................................................#...............
+..................................................................#.......................................#.........................#.......
+.........................#................................#........................................................#........................
+........#...................................................................................#......#....................................#...
+...............................................................#...............#............................................................
+.............................................#.........................#.....................................#..............................
+...................#...............#........................................................................................................
+..........................#..............................#....................................#..................................#..........
+...........#.....................................................................#.....#....................................................
+...#.................................................#...............................................#...........#...........#..............
+...............#........................#................................................................................................#..
+....................#..............................................#.....................................#..................................
+..................................#.....................#................................#..................................................
+............................................#...................................................#.............#.............................
+........................................................................................................................#.....#......#.....#
+...........................................................#..................#......................#......................................
+...................#.........#....................................#.........................#...............................................
+....................................................#...............................................................#.......................
+.............#........................#....................................................................................#................
+....................................................................................#...................................................#...
+.......#................................................#................#..................................................................
+.#.................................................................#..............................................................#.........
+...................#.....#...................................................................#.........#.........#..........................
+............................................#.....#............#..................................#.........#................#..............

2023/go/day12/day12.go

@@ -0,0 +1,136 @@
+package day12
+
+import (
+	"fmt"
+	"strings"
+
+	"adventofcode2023/utils"
+	"adventofcode2023/utils/inputs"
+)
+
+var cache = make(map[string]int)
+
+type memoized struct {
+	f     func(int) int
+	cache map[string]int
+   }
+
+func Part1(input string) int {
+	ans := 0
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		slices := strings.Split(line, " ")
+		record := slices[0]
+		groups := inputs.ToInts(slices[1], ",")
+		ans += calc(record, groups)
+	}
+	return ans
+}
+
+func Part2(input string) int {
+	ans := 0
+	lines := strings.Split(input, "\n")
+	for i, line := range lines {
+		slices := strings.Split(line, " ")
+		record := slices[0] + "?" + slices[0] + "?" + slices[0] + "?"  + slices[0] + "?"  + slices[0]
+		groups := inputs.ToInts(slices[1] + "," + slices[1] + "," + slices[1] + "," + slices[1] + "," + slices[1] , ",")
+		ans += calc(record, groups)
+		fmt.Printf("running total after lines %v = %v\n",i, ans)
+	}
+	return ans
+}
+
+func calc(record string, groups []int) int {
+	key := record + fmt.Sprint(groups)
+	if v, ok := cache[key]; ok {
+		return v
+	}
+	// ADD LOGIC HERE ... Base-case logic will go here
+	// Did we run out of groups? We might still be valid
+	if len(groups) == 0 {
+		// Make sure there aren't any more damaged springs, if so, we're valid
+		if ! strings.Contains(record, "#") {
+			cache[key] = 1
+			return 1
+		} else {
+			// Not valid to runout of groups and still have damaged springs "#"
+			cache[key] = 0
+			return 0
+		}
+	}
+
+	if len(record) == 0 {
+		// Already know there are more groups but no records
+		cache[key] = 0
+		return 0
+	}
+
+    // Look at the next element in each record and group
+    next_character := record[0]
+    next_group := groups[0]
+	out := 0
+
+	if next_character == '#' {
+		// Test pound logic
+		out = pound(record, groups, next_group)
+	} else if next_character == '.' {
+		// Test dot logic
+		out = dot(record, groups)
+	} else if next_character == '?' {
+		// This character could be either character, so we'll explore both
+		//possibilities
+		out = dot(record, groups) + pound(record, groups, next_group)
+	} else {
+		utils.PanicOnErr(fmt.Errorf("RuntimeError"))
+	
+	}
+	// Help with debugging
+	// fmt.Println(record, groups, out)
+	cache[key] = out
+	return out
+}
+
+// Logic that treats the first character as pound-sign "#"
+func pound(record string, groups []int, next_group int) int {
+
+    // If the first is a pound, then the first n characters must be
+    // able to be treated as a pound, where n is the first group number
+	if next_group > len(record) {
+		return 0
+	}
+	this_group := record[:next_group]
+    this_group = strings.Replace(this_group, "?", "#", -1)
+
+	// If the next group can't fit all the damaged springs, then abort
+    if this_group != strings.Repeat("#", next_group) {
+        return 0
+	}
+
+	// If the rest of the record is just the last group, then we're
+    // done and there's only one possibility
+    if len(record) == next_group {
+        // Make sure this is the last group
+        if len(groups) == 1 {
+            //We are valid
+            return 1
+		} else {
+            // There's more groups, we can't make it work
+            return 0
+		}
+	}
+
+	// Make sure the character that follows this group can be a seperator
+    if record[next_group] == '?' || record[next_group] == '.' {
+        // It can be seperator, so skip it and reduce to the next group
+        return calc(record[next_group+1:], groups[1:])
+	}
+	// Can't be handled, there are no possibilites
+	return 0
+}
+
+// Logic that treats the first character as dot "."
+func dot(record string, groups []int) int {
+	// ADD LOGIC HERE ... need to process this character and call
+	// We just skip over the dot looking for the next pound
+    return calc(record[1:], groups)
+}

2023/go/day12/day12_test.go

@@ -0,0 +1,29 @@
+package day12
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`???.### 1,1,3
+.??..??...?##. 1,1,3
+?#?#?#?#?#?#?#? 1,3,1,6
+????.#...#... 4,1,1
+????.######..#####. 1,6,5
+?###???????? 3,2,1`)
+	require.Equal(t, 21, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`???.### 1,1,3
+.??..??...?##. 1,1,3
+?#?#?#?#?#?#?#? 1,3,1,6
+????.#...#... 4,1,1
+????.######..#####. 1,6,5
+?###???????? 3,2,1`)
+	require.Equal(t, 525152, r)
+}

2023/go/day13/day13.go

@@ -0,0 +1,144 @@
+package day13
+
+import (
+	"adventofcode2023/utils"
+	"fmt"
+	"strings"
+)
+
+type mirrorLoc struct {
+	orient string
+	index int
+}
+func Part1(input string) int {
+	count := 0
+
+	patterns := strings.Split(input, "\n\n")
+	for p, pattern := range patterns {
+		rows := strings.Split(pattern, "\n")
+		if v, ok := findMirror(rows); ok {
+			count = count + v * 100
+		} else {
+			cols := swap(rows)
+			if v, ok := findMirror(cols); ok {
+				count = count + v
+			} else {
+				utils.PanicOnErr(fmt.Errorf("p: %v\n %v\n", p, pattern))
+			}
+		}
+	}
+	return count
+}
+
+func Part2(input string) int {
+	count := 0
+	patterns := strings.Split(input, "\n\n")
+
+	for p, pattern := range patterns {
+		rows := strings.Split(pattern, "\n")
+		loc, _ := findMirrorLoc(rows)
+		found := false
+		for i:=0;i<len(rows[0])*len(rows);i++{
+			newRows := smudge(i, rows)
+			if v, ok := findNewMirrorLoc(loc, newRows); ok {
+				if v != loc {
+					found = true
+					if v.orient == "row" {
+						count = count + v.index * 100
+					} else {
+						count = count + v.index
+					}
+					break
+				}
+			}
+		}
+		if ! found {
+			utils.PanicOnErr(fmt.Errorf("p: %v\n %v\n", p, pattern))
+		}
+	}
+	return count
+}
+
+func smudge(i int, rows []string) []string {
+	out := make([]string, len(rows))
+	copy(out, rows)
+	col := i % len(rows[0])
+	row := i / len(rows[0])
+	if col >= 0 && col < len(rows[0]) {
+		v := rows[row][col]
+		if v == '#' {
+			out[row] = out[row][:col] + "."  + out[row][col+1:]
+		} else {
+			out[row] = out[row][:col] + "#"  + out[row][col+1:]
+		}
+	}
+	return out
+}
+
+func findNewMirrorLoc(loc mirrorLoc, rows []string) (mirrorLoc, bool) {
+	if v, ok := findNewMirror(loc, "row", rows); ok {
+		return mirrorLoc{"row", v}, true
+	}
+	cols := swap(rows)
+	if v, ok := findNewMirror(loc, "col", cols); ok {
+		return mirrorLoc{"col", v}, true
+	}
+	return mirrorLoc{}, false
+}
+
+func findMirrorLoc(rows []string) (mirrorLoc, bool) {
+	if v, ok := findMirror(rows); ok {
+		return mirrorLoc{"row", v}, true
+	}
+	cols := swap(rows)
+	if v, ok := findMirror(cols); ok {
+		return mirrorLoc{"col", v}, true
+	}
+	return mirrorLoc{}, false
+}
+
+func swap(in []string) []string {
+	out := []string{}
+	for j:=0;j<len(in[0]);j++ {
+		o := ""
+		for i:=0;i<len(in);i++ {
+			o = o + string(in[i][j])
+		}
+		out = append(out, o)
+	}
+	return out
+}
+
+func findMirror(rows []string) (int, bool) {
+	for i:=0;i<len(rows)-1;i++ {
+		if rows[i] == rows[i+1] {
+			if isMirror(i, 0, rows) {
+				return i+1, true
+			}
+		}
+	}
+	return -1, false
+}
+
+func findNewMirror(loc mirrorLoc, orient string, rows []string) (int, bool) {
+	for i:=0;i<len(rows)-1;i++ {
+		if orient == loc.orient && i == loc.index - 1{ continue } 
+		if rows[i] == rows[i+1] {
+			if isMirror(i, 0, rows) {
+				return i+1, true
+			}
+		}
+	}
+	return -1, false
+}
+
+func isMirror(i int, offset int, rows []string) bool {
+	if i == 0 || i == len(rows) - 1 { return true }
+
+	if i - offset < 0 || i+1+offset > len(rows) - 1 { return true }
+
+	if rows[i+1+offset] == rows[i-offset] { 
+		return isMirror(i, offset+1, rows)
+	}
+	return false
+}

2023/go/day13/day13_test.go

@@ -0,0 +1,47 @@
+package day13
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#`)
+	require.Equal(t, 405, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#`)
+	require.Equal(t, 400, r)
+}

2023/go/day13b/day13.go

@@ -0,0 +1,59 @@
+package day13
+
+import (
+	_ "adventofcode2023/utils"
+	"adventofcode2023/utils/inputs"
+	_ "fmt"
+	"strings"
+)
+
+func Part1(input string) int {
+	return symmetry(input, 0)
+}
+
+func Part2(input string) int {
+	return symmetry(input, 1)
+}
+
+func symmetry(input string, smudges int) int {
+	ans := 0
+
+	patterns := strings.Split(input, "\n\n")
+	for _, pattern := range patterns {
+		grid := inputs.ToGrid2D[rune](pattern, "\n", "", ' ', func(c string) rune { return rune(c[0])})
+		G := grid.Matrix()
+		R := len(G)
+		C := len(G[0])
+		// vertical symmetry
+		for c:=0;c<C-1;c++ {
+			badness := 0
+			for dc:=0;dc<C;dc++ {
+				left := c-dc
+				right := c+1+dc
+				if left < 0 || left > right || right > C -1 { break }
+				for r:=0;r<R;r++ {
+					if G[r][left] != G[r][right] {
+						badness += 1
+					}
+				}
+			}
+			if badness == smudges { ans += c+1 }
+		}
+		// horizontal symmetry
+		for r:=0;r<R-1;r++ {
+			badness := 0
+			for dr:=0;dr<R;dr++ {
+				up := r-dr
+				down := r+1+dr
+				if up < 0 || up > down || down > R -1 { break }
+				for c:=0;c<C;c++ {
+					if G[up][c] != G[down][c] {
+						badness += 1
+					}
+				}
+			}
+			if badness == smudges { ans += 100*(r+1) }
+		}
+	}
+	return ans
+}

2023/go/day13b/day13_test.go

@@ -0,0 +1,47 @@
+package day13
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#`)
+	require.Equal(t, 405, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#`)
+	require.Equal(t, 400, r)
+}

2023/go/day14/day14.go

@@ -0,0 +1,95 @@
+package day14
+
+import (
+	_ "adventofcode2023/utils"
+	"adventofcode2023/utils/grid2d"
+	"adventofcode2023/utils/inputs"
+	"fmt"
+	_ "strings"
+)
+
+func Part1(input string) int {
+	grid := inputs.ToGrid2D[rune](input, "\n", "", ' ', func(c string) rune { return rune(c[0])})
+//	fmt.Println(grid.StringWithFormatter(func(c rune, x int, y int) string { return string(c)}))
+	slide(grid)
+//	fmt.Println(grid.StringWithFormatter(func(c rune, x int, y int) string { return string(c)}))
+	return score(grid)
+}
+
+func Part2(input string) int {
+	grid := inputs.ToGrid2D[rune](input, "\n", "", ' ', func(c string) rune { return rune(c[0])})
+//	fmt.Println(grid.StringWithFormatter(func(c rune, x int, y int) string { return string(c)}))
+	x:= 0
+	for j:=0;j<125;j++ {
+		for i:=0;i<4;i++ {
+			slide(grid)
+			grid = rotate(grid)
+		}
+		if  score(grid) == 101375 { 
+			fmt.Println(j, j - x)
+			x = j
+		 }
+	}
+	fmt.Println(score(grid))
+	for j:=999999840+125;j<1000000000;j++ {
+		for i:=0;i<4;i++ {
+			slide(grid)
+			grid = rotate(grid)
+		}
+		if  score(grid) == 101375 { 
+			fmt.Println(j, j - x)
+			x = j
+		 }
+	}
+//	fmt.Println(grid.StringWithFormatter(func(c rune, x int, y int) string { return string(c)}))
+	return score(grid)
+}
+
+
+func slide(grid *grid2d.Grid[rune]) {
+	G := grid.Matrix()
+	R := len(G)
+	C := len(G[0])
+	for c:=0;c<C;c++ {
+		for r:=0;r<R;r++ {
+			for dr:=0;dr<R;dr++ {
+				if G[dr][c]=='O' && dr>0 && G[dr-1][c]=='.' {
+					G[dr][c]='.'
+					G[dr-1][c] = 'O'
+				}
+			}
+		}
+	}
+
+}
+
+func rotate(grid *grid2d.Grid[rune]) *grid2d.Grid[rune] {
+	G := grid.Matrix()
+	R := len(G)
+	C := len(G[0])
+	New := grid2d.NewGrid[rune](R, C, '?')
+	NG := New.Matrix()
+	for r:=0;r<R;r++ {
+    	for c:=0;c<C;c++ {
+      		NG[c][R-1-r] = G[r][c]
+		}
+	}
+  	return New
+}
+
+func score(grid *grid2d.Grid[rune]) int {
+	ans := 0
+
+	G := grid.Matrix()
+	R := len(G)
+	C := len(G[0])
+
+  	for r:=0;r<R;r++ {
+    	for c:=0;c<C;c++ {
+    		if G[r][c]=='O' {
+        		ans += len(G)-r
+	  		}
+		}
+	}
+  	return ans
+}

2023/go/day14/day14_test.go

@@ -0,0 +1,37 @@
+package day14
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`O....#....
+O.OO#....#
+.....##...
+OO.#O....O
+.O.....O#.
+O.#..O.#.#
+..O..#O..O
+.......O..
+#....###..
+#OO..#....`)
+	require.Equal(t, 136, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`O....#....
+O.OO#....#
+.....##...
+OO.#O....O
+.O.....O#.
+O.#..O.#.#
+..O..#O..O
+.......O..
+#....###..
+#OO..#....`)
+	require.Equal(t, 64, r)
+}

2023/go/day14/input.txt

@@ -0,0 +1,100 @@
+O...#.O......#...##....O#.#.OO...O.#OO#.....#O.O.....#......#.OO...O...O..O#O#....#...O..O...O.....O
+.OO......O.OO.O.#.#O.O...#.##OO.....#.#O#...OOOOO..##O#O..O#O.##O...#O....O#.#.OO....#.........O.O.O
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+O...##O..#....OO.OO....O...O...O#..##.OOO..O..#OO....###....OO.O.O...........O...O..O.....#.#..O.O#.
+............#.#.##O.O.#.#OO#........O..O.O..##....O.#..#O..O...O#.#.#.........O...........OO......O.
+#.OO........#..#O.#......#....#....#......OO..OO...O#...#...#..##..O#.O......#.#..O..#O#...#..#.O#.O
+O.O.##...........O...O..O...O.OO.......##....#...O.....##...#.....OO...O.O#...OO..........O...O..#O.
+.O##....#.O#O....O.O.#.#O.O#..OO..##..#OO.#...#......#.#O#.....O...O#.O...#..O.#.#......#.##.O....O.
+.........#..#.O..O..O.O...#.#.O...#.OOO.##..#.O.....OO#....O...OOO#.O#....##O..#.O.O.....O.O.O.O..O.
+......#O.....OOO###.O..O####O.#.O...............#..O......##O...#.#..###...O....#O...OO.OO.O......O.
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+..#...#O.....OO#.....O..#.#O.#.#..#..O.....#...OO.#.....O..O.O##.O.....OOOO.#O.....O.#..O........#.#
+.#.#O..O.O..#..O##.....O.OO...##.........O...####..O..O....#O..O.....##........O.#..#.#OO.#..O.##.O#
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+...#....#.....O....O.O.O##.O..#O.OO...#.##.O..###OO##.O......#..##.OO...O.......O.......#..O.#.O..O.
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+..#O....#..O..####.O#...O....O.#O.##.O....O.O......O#O...OO###...O..#........#.#O.O#OO.......#.....O
+....O.....#.#.O.#..O.#O.#.#O.#.......OO.....OOO...O.O..#.#....#..O.O..#.OO.O..O..OO##.....#.O..OO#O.
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+...O.....##....#....#....#......O#O..OO.....OO#O.OO......#OO.......O.#..###OO...#.O..OO.#.O.O#OO..#.
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+..##O#O.O.#.........O....O.OO#O#O.....O.....O#O.OO.O......O.O.OO......#.....O.O.O.O.O.....#.O.......
+.....#OO.#O........O#....O.#OO.OO........#.O....O.OOOOOO.#.#O......O.#...O#.O.O..OO.....O.OO...#.O.#
+.....#................OO..OOOO..#.....O.###O.O...O..#O..........OO.#...OO.O#...O......O..OOOO.#..###
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2023/go/day15/day15.go

@@ -0,0 +1,80 @@
+package day15
+
+import (
+	"adventofcode2023/utils"
+	_ "fmt"
+	"strings"
+)
+
+type Lens struct {
+	label	string
+	fl		int
+}
+
+func Part1(input string) int {
+	ans := 0
+	seqs := strings.Split(input, ",")
+	for _,seq := range seqs {
+		ans += hash(seq)
+	}
+	
+	return ans
+}
+
+func Part2(input string) int {
+	Boxes := [256][]Lens{}
+	cmds := strings.Split(input, ",")
+	for _,cmd := range cmds {
+		if cmd[len(cmd)-1] == '-' {
+			label := cmd[:len(cmd)-1]
+			hash := hash(label)
+			nl := []Lens{}
+			for _, lens := range Boxes[hash] {
+				if lens.label != label {
+					nl = append(nl, lens)
+				}
+			}
+			Boxes[hash] = nl
+		} else {
+			tokens := strings.Split(cmd, "=")
+			label := tokens[0]
+			fl := utils.MustAtoi(tokens[1])
+			hash := hash(label)
+			nl := []Lens{}
+			if len(Boxes[hash]) == 0 {
+				Boxes[hash] = append(Boxes[hash], Lens{label:label, fl:fl})
+			} else {
+				found := false
+				for _, lens := range Boxes[hash] {
+					if lens.label == label {
+						nl = append(nl, Lens{label:label, fl:fl})
+						found = true
+					} else {
+						nl = append(nl, lens)
+					}
+				}
+				Boxes[hash] = nl
+				if ! found {
+					Boxes[hash] = append(Boxes[hash], Lens{label:label, fl:fl})
+				}
+			}
+		}
+	}
+	ans := 0
+	for i, box := range Boxes {
+		for j, lens := range box {
+			ans += (i+1) * (j +1) * lens.fl
+		}
+	} 
+		return ans
+}
+
+func hash(in string) int {
+	result := 0
+	for _, letter := range in {
+		result += int(letter) 
+		result = result * 17
+		result = result % 256
+	}
+	return result
+}

2023/go/day15/day15_test.go

@@ -0,0 +1,17 @@
+package day15
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1("rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7")
+	require.Equal(t, 1320, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2("rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7")
+	require.Equal(t, 145, r)
+}

2023/go/day16/day16.go

@@ -0,0 +1,202 @@
+package day16
+
+import (
+	_ "adventofcode2023/utils"
+	"adventofcode2023/utils/grid2d"
+	_ "adventofcode2023/utils/grid2d"
+	"adventofcode2023/utils/inputs"
+	"fmt"
+	_ "strings"
+)
+
+type Tile struct {
+	object rune
+	energized int
+}
+
+type Beam struct {
+	dir rune
+	r int
+	c int
+	rm bool
+}
+
+var startBeams []Beam
+
+func Part1(input string) int {
+	beams := []Beam{}
+	beams = addBeam(beams, Beam{'s', 0, 3, false})
+	grid := inputs.ToGrid2D[Tile](input, "\n", "", Tile{}, func(c string) Tile { return Tile{ object: rune(c[0]), energized: 0}})
+	return score(grid, beams)
+}
+
+func Part2(input string) int {
+	grid := inputs.ToGrid2D[Tile](input, "\n", "", Tile{}, func(c string) Tile { return Tile{ object: rune(c[0]), energized: 0}})
+	G := grid.Matrix()
+	R := len(G)
+	C := len(G[0])
+	ans := 0
+	for r:=0;r<R;r++{
+		beams := []Beam{}
+		grid := inputs.ToGrid2D[Tile](input, "\n", "", Tile{}, func(c string) Tile { return Tile{ object: rune(c[0]), energized: 0}})
+		beams = addBeam(beams, Beam{'e', r, 0, false})
+		ans = max(ans, score(grid, beams))
+		beams = []Beam{}
+		beams = addBeam(beams, Beam{'w', r, C-1, false})
+		grid = inputs.ToGrid2D[Tile](input, "\n", "", Tile{}, func(c string) Tile { return Tile{ object: rune(c[0]), energized: 0}})
+		ans = max(ans, score(grid, beams))
+	}
+	for c:=0;c<C;c++{
+		beams := []Beam{}
+		grid := inputs.ToGrid2D[Tile](input, "\n", "", Tile{}, func(c string) Tile { return Tile{ object: rune(c[0]), energized: 0}})
+		beams = addBeam(beams, Beam{'s', 0, c, false})
+		ans = max(ans, score(grid, beams))
+		beams = []Beam{}
+		beams = addBeam(beams, Beam{'n', R-1, c, false})
+		grid = inputs.ToGrid2D[Tile](input, "\n", "", Tile{}, func(c string) Tile { return Tile{ object: rune(c[0]), energized: 0}})
+		ans = max(ans, score(grid, beams))
+	}
+
+	return ans
+}
+
+func max(a, b int) int {
+    if a > b {
+        return a
+    }
+    return b
+}
+
+func score(grid *grid2d.Grid[Tile], beams []Beam) int {
+	fmt.Println(grid.StringWithFormatter(func(t Tile, x int, y int) string { return string(t.object)}))
+	G := grid.Matrix()
+	R := len(G)
+	C := len(G[0])
+	fmt.Println("r:", R, "c:", C, "tiles:", R*C )
+	for i:=0;i<1000;i++ {
+		beams = rmBeams(beams)
+		fmt.Println(i, ":", len(beams), ":", energy(G))
+		for i, _ := range beams {
+			r := beams[i].r
+			c := beams[i].c
+			if r >= 0 && r < R && c >= 0 && c < C {
+				G[r][c].energized++
+				switch beams[i].dir {
+				case 'n':
+						tile := &G[r][c]
+						switch tile.object {
+						case '.':
+							beams[i].r--
+						case '|':
+							beams[i].r--
+						case '-':
+							beams[i].dir = 'e'
+							beams[i].c++
+							beams = addBeam(beams, Beam{'w', beams[i].r, beams[i].c-1, false})
+						case '\\':
+							beams[i].dir = 'w'
+							beams[i].c--
+						case '/':
+							beams[i].dir = 'e'
+							beams[i].c++
+						}
+				case 'e':
+						tile := &G[r][c]
+						switch tile.object {
+						case '.':
+							beams[i].c++
+						case '-':
+							beams[i].c++
+						case '|':
+							beams[i].dir = 'n'
+							beams[i].r--
+							beams = addBeam(beams, Beam{'s', beams[i].r+1, beams[i].c, false})
+						case '\\':
+							beams[i].dir = 's'
+							beams[i].r++
+						case '/':
+							beams[i].dir = 'n'
+							beams[i].r--
+						}
+				case 's':
+						tile := &G[r][c]
+						switch tile.object {
+						case '.':
+							beams[i].r++
+						case '|':
+							beams[i].r++
+						case '-':
+							beams[i].dir = 'e'
+							beams[i].c++
+							beams = addBeam(beams, Beam{'w', beams[i].r, beams[i].c-1, false})
+						case '\\':
+							beams[i].dir = 'e'
+							beams[i].c++
+						case '/':
+							beams[i].dir = 'w'
+							beams[i].c--
+						}
+				case 'w':
+						tile := &G[r][c]
+						switch tile.object {
+						case '.':
+							beams[i].c--
+						case '-':
+							beams[i].c--
+						case '|':
+							beams[i].dir = 'n'
+							beams[i].r--
+							beams = addBeam(beams, Beam{'s', beams[i].r+1, beams[i].c, false})
+						case '\\':
+							beams[i].dir = 'n'
+							beams[i].r--
+						case '/':
+							beams[i].dir = 's'
+							beams[i].r++
+						}
+				}
+			} else {
+				beams[i].rm = true
+			}
+		}
+		fmt.Println(grid.StringWithFormatter(func(t Tile, x int, y int) string { if t.energized > 0 {return "#"}; return "."}))
+	}
+	fmt.Println(grid.StringWithFormatter(func(t Tile, x int, y int) string { if t.energized > 0 {return "#"}; return "."}))
+	return energy(G)
+}
+
+func rmBeams(slice []Beam) []Beam {
+    var result []Beam
+
+    for _, value := range slice {
+        if ! value.rm {
+            result = append(result, value)
+        }
+    }
+    return result
+}
+
+func addBeam(beams []Beam, beam Beam) []Beam {
+    for _, value := range startBeams {
+        if value == beam { return beams }
+    }
+	startBeams = append(startBeams, beam)
+	for _, value := range beams {
+        if value == beam { return beams }
+    }
+    return append(beams, beam)
+}
+
+func energy(G [][]Tile) int {
+	ans := 0
+	R := len(G)
+	C := len(G[0])
+	for r:=0;r<R;r++ {
+		for c:=0;c<C;c++ {
+			if G[r][c].energized > 0 {
+				ans++
+			}
+		}
+	}
+	return ans
+}

2023/go/day16/day16.py

@@ -0,0 +1,68 @@
+#!/usr/bin/python3
+import sys
+import re
+from copy import deepcopy
+from math import gcd
+from collections import defaultdict, Counter, deque
+D = open(sys.argv[1]).read().strip()
+L = D.split('\n')
+G = [[c for c in row] for row in L]
+
+R = len(G)
+C = len(G[0])
+
+DR = [-1, 0, 1, 0]
+DC = [ 0, 1, 0,-1]
+
+def step(r,c,d):
+  return (r+DR[d], c+DC[d], d)
+
+def score(sr,sc,sd):
+  POS = [(sr,sc,sd)]
+  SEEN = set()
+  SEEN2 = set()
+  while True:
+    NP = []
+    if not POS:
+      break
+    for (r,c,d) in POS:
+      #print(r,c,d)
+      if 0<=r<R and 0<=c<C:
+        SEEN.add((r,c))
+        if (r,c,d) in SEEN2:
+          continue
+        SEEN2.add((r,c,d))
+        ch = G[r][c]
+        if ch=='.':
+          NP.append(step(r,c,d))
+        elif ch=='/':
+          # up right down left
+          NP.append(step(r,c,{0:1, 1:0, 2:3, 3:2}[d]))
+        elif ch=='\\':
+          NP.append(step(r,c,{0:3, 1:2, 2:1, 3:0}[d]))
+        elif ch=='|':
+          if d in [0,2]:
+            NP.append(step(r,c,d))
+          else:
+            NP.append(step(r, c, 0))
+            NP.append(step(r, c, 2))
+        elif ch=='-':
+          if d in [1,3]:
+            NP.append(step(r,c,d))
+          else:
+            NP.append(step(r, c, 1))
+            NP.append(step(r, c, 3))
+        else:
+          assert False
+    POS = NP
+  return len(SEEN)
+
+print(score(0,0,1))
+ans = 0
+for r in range(R):
+  ans = max(ans, score(r,0,1))
+  ans = max(ans, score(r,C-1,3))
+for c in range(C):
+  ans = max(ans, score(0,c,2))
+  ans = max(ans, score(R-1,c,0))
+print(ans)

2023/go/day16/day16_test.go

@@ -0,0 +1,37 @@
+package day16
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(
+`.|...\....
+|.-.\.....
+.....|-...
+........|.
+..........
+.........\
+..../.\\..
+.-.-/..|..
+.|....-|.\
+..//.|...`)
+	require.Equal(t, 46, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(
+`.|...\....
+|.-.\.....
+.....|-...
+........|.
+..........
+.........\
+..../.\\..
+.-.-/..|..
+.|....-|.\
+..//.|...`)
+	require.Equal(t, 51, r)
+}

2023/go/day16/input.txt

@@ -0,0 +1,110 @@
+\.......................\..........................................-..................-.../................-..
+....../.......\...-......-.|...\..............\.................|............././....-........................
+...............-...-........................................\......\..-.............|......-....\....-........
+..\..|.|...........................-.|........................................./.|....|................|......
+|../................|............................................................\........../..\..............
+........\............../................/..........................\...\....|............./....-.........\\...
+.................-...-...................\../........-|.................../......-...........|................
+........-............/...|-............-.....\.|..............-....-../\../..................\...\././........
+........................-|................................................................-........-..........
+-......./.................|.....\.................\.....//............-........./..../....|...................
+....-.............-........-..........-|.......|...../...\...................\.....................|..........
+...|...\.........|.................|.....|....-....\.......\./........................-.../..../.....-........
+....|....-.-..............\.........|.......................-.......-..............\................/.........
+.....|.\...........-.................-.-........../...\............|...............|...|......./.......|...../
+.....\.........................-.../..-./...\...................../......\...-.......|.\........-|............
+............|.....................................-....../....\.............../-...|...\..\................./.
+......-./|....../............|.........\............-../...-......./.\..\....../......|/...\..................
+................................|.......|..-..../.............................../.-..................-..-/..|.
+...............................-......./......................|./...............-............./....../........
+..................../....................\........\...........................-............/.../..............
+.|||......../.................|.................../..\............................-......./..|...|/.-.........
+......-......./\....../.........|....../.......-...............|.\........-............/.../..................
+.....................-.\/|................//.../.........|.|......\.-..|.........|.........\..................
+.........................\/.......|.|............................|........|.............................././..
+.................................|.................\../..|/.................\.................-...-........-/.
+......................-...-.........../...........................\....\......-..-.......\.-....\....|........
+......-......../..............\/..................\..|........-..............|...-...../......|...............
+|.......|.../....|..............//.....................|..........|/......../................|................
+...|.|..................../|..../.-.......-...........|.....|./....\......-......-................|...........
+......\/./.|\..../|.|..|..........-....|...........|.-.|...................-.\.....|....................\.....
+......../.\......................|.....|...........|.........../.......|....|...|.......-......../......\...-.
+...|...-...||......-..|..-...........|.-.................|.................................-..................
+..............-.\.-........|......\..........................................\./.\........../.....|...........
+../\.........|...............|............|.\/.-/.................-....|...-.................-.....|..../.....
+....................../......../..../-.....\........................\..-.\....|....-.........../-.............
+.................................|................|.........|................../|.....|....\\............/.\..
+...///./.....\.................|/.....................\...................-............|................|.....
+............-...........................--........\................/.............-\................\.....-.../
+...............\.........../|............................|.....................\...-...\.....................-
+...\.............|.............|................\............\|...../...|.........................|...........
+..................|......|..........-.-..............\.........................\..............................
+....-................../.........../...|................/...............|./.|.../....\..../......./......//...
+...../....../..............................|...\../..........-..........-........-..//..../...................
+...............-......|......................|./........./............/..-...........|../.....-........-./....
+..\.........................|...-.......\.................|..............-........\....-.............-....|...
+.......|......|....../........\...........|......-........../......-..................../....................\
+.......................|....-..|........./.|.-...............|..\......\.....-.......\...-/....|/.........\...
+\......\..-.....................\..........................\................................../...........\...
+-....-......../............................................................../.\.......|..............|....-..
+........|......................|.............-....\................................./..\.......|..........-...
+...-...............|........./......\...../.......|...|...............\.../...\.../......|.....-.\......\.....
+............./.....|......................|.....................................\...||.................-....|.
+./.....-................/........|./....-......../......./..............\..................................\..
+.../..../\........-..........................|.-/.|..\................\\-.......|......./...||.......|........
+.....-.........................-...............\...........|.............-.\.../.|......-.|......../...-.....-
+......\....................|...../......................|.../......-..|............|......./.../.........|....
+...|...........-....................................../.|............./....|..../........./.....\../..........
+....../.../................\........................\...\....\......\............../|...............\.-.......
+./....\.../.............|............................-.../............../............/...........\...|........
+............................|.................|/..........//.........../..-...............|...................
+.....\......\.................|.....|...\-./...............\................|....../.....-..\........-....-...
+........................./-........\................./........-/.|....-.......\............-/\......|.\...-...
+..../../..|.|...............\.......................................-.........................................
+...........|...................................................-...-......|..................\............../.
+/....|......................................................................|\.../.......-...........-...|....
+......|.-.\......-........|.....-..|.\..............-......./......-|.........................-...............
+............\......................................|........................|.-...............................
+.........-.........../....\./....../.-...-..//.........../.......\\...........................................
+........\......../............./...-......\.../..|..|............................../......../..\..............
+--.........|.....-...|............../...|.......|..............\|............|.........................|.-....
+-\......./..............-....-....\...|.-........\/.\./............-/...\........|-.........../../...\........
+.\|\..............-......-.\...-....\..........................\........|...........-......./.............../.
+..........................|...\..../.../..........\.............-...//...............\..................-.....
+........./..........................\............|-.....|..-...|......../........-...........................\
+.......\.../.....\....../.......|..|...............-......................|....-...................-.|........
+......|.......\.../..............................-..............................|......-.-...................\
+/.....|.......-............/|.....|-......./..../......-........../..|......../.-..\..../....../...|..........
+............/..--..........-............\.......\................\........................../../....|.........
+..|..-................|.|..|................/.......\............-//.......................\..\...............
+.......................-......-..................|....\................-......\.|....\....|..../../|.-........
+........................-..................-...........................-..-................-................|.
+/.\....|.-.................................\..-.....\./.........../-.|..............\..\.....--|/....\........
+.......-..-../..................\..--|..............|...............|\........|...--................|./.\.....
+..........|................-.......|..................................................|...................|...
+-.-..|....-.|........-./...|.-.........\.....\/........-........\........../................./.../........\...
+..................../...|/......................................../............\.|./../................/\|....
+...//.........................\....../..............\../.......-..\....|......................................
+............................./..|./../.........-/..\..........................................................
+......\.....|..................|..................\.....\.-..\...../............................../...........
+..........\...........-..........-.....-....\/................../.................................\.....|..\..
+..../.\...................................\............\...\....|.................|.....................-.....
+...........-...........................\.......|-../.|....|.....|......................-...../................
+.......|.........\..............|....\...-......../...........-.....-..-...........-..................\...\.|.
+...........|.......................|....-..........\............................\.................../.\.......
+..../.................\.......-..|.................../........................|...............\...........-.|.
+............./..|.-\..../.....-............-....|..\......|......../............-.........|................\..
+...................\...\/......\............|......................\....|...................-./-..............
+..-\...........|.................../.....|....|............................-..|............\.............\....
+.|.....\....\........|..................\...............|..-/.........|.-/...........-............-...........
+.....\...../......-............|........./..|............-........................\....-......................
+......\......../........|..............\...-..-...|.......................................................|...
+...................|.................................\.....\...........................|../.|.-......-........
+..................|..............\.....\............|........../....../...............\.........\.............
+..|...........-..../....\.........--...\................../.............-...-....................-..../....|..
+.|...\...................|......-...........-\..........\.....|.....|..........|.........|....|-../...........
+.............\|...................../\...............\....../.......-....\.....................-..............
+.......//.....................\....\......\......\.........|...................../......../.........\......-..
+.\./.........-...-./-.\.............../......|................................\|....\...../....-..............
+.......|......../......../......./.........../...............|............................../..|......../.....
+............./.........|.....-./.........../....-......./|......-................|............................

2023/go/main.go

@@ -14,6 +14,18 @@ import (
 	"adventofcode2023/day05"
 	"adventofcode2023/day06"
 	"adventofcode2023/day07"
+	"adventofcode2023/day08"
+	"adventofcode2023/day09"
+	"adventofcode2023/day10"
+	"adventofcode2023/day11"
+	"adventofcode2023/day12"
+	"adventofcode2023/day13"
+	"adventofcode2023/day14"
+	"adventofcode2023/day15"
+	"adventofcode2023/day16"
+
+	
+
 )
 // Usage: go run main.go <NN>
 // assumes input is in day<NN>/input.txt
@@ -43,6 +55,33 @@ func main() {
 	case 7:
 		fmt.Printf("part 1: %d\n", day07.Part1(utils.Readfile(d)))
 		fmt.Printf("part 2: %d\n", day07.Part2(utils.Readfile(d)))
+	case 8:
+		fmt.Printf("part 1: %d\n", day08.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day08.Part2(utils.Readfile(d)))
+	case 9:
+		fmt.Printf("part 1: %d\n", day09.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day09.Part2(utils.Readfile(d)))
+	case 10:
+		fmt.Printf("part 1: %d\n", day10.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day10.Part2(utils.Readfile(d)))
+	case 11:
+		fmt.Printf("part 1: %d\n", day11.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day11.Part2(utils.Readfile(d)))
+	case 12:
+		fmt.Printf("part 1: %d\n", day12.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day12.Part2(utils.Readfile(d)))
+	case 13:
+		fmt.Printf("part 1: %d\n", day13.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day13.Part2(utils.Readfile(d)))
+	case 14:
+		fmt.Printf("part 1: %d\n", day14.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day14.Part2(utils.Readfile(d)))
+	case 15:
+		fmt.Printf("part 1: %d\n", day15.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day15.Part2(utils.Readfile(d)))
+	case 16:
+		fmt.Printf("part 1: %d\n", day16.Part1(utils.Readfile(d)))
+		fmt.Printf("part 2: %d\n", day16.Part2(utils.Readfile(d)))
 	default:
 		panic(fmt.Errorf("no such day: %d", d))
 	}
@@ -50,7 +89,7 @@ func main() {
 
 // Reads day from os.Args.
 func day() int {
-	latest := 6
+	latest := 15
 	if len(os.Args) == 1 {
 		return latest
 	}

2023/go/utils/grid2d/grid2d.go

@@ -39,6 +39,9 @@ func (g *Grid[T]) SizeX() int {
 func (g *Grid[T]) SizeY() int {
 	return g.sizeY
 }
+func (g *Grid[T]) Matrix() [][]T {
+	return g.matrix
+} 
 
 func (g *Grid[T]) Get(x, y int) T {
 	if x < 0 || x >= g.sizeX {

2024/.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileDirname}",
+            "args": ["2"]
+        }
+    ]
+}

2024/gareth/day01/day01.go

@@ -0,0 +1,54 @@
+package day01
+
+import (
+	"math"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+func Part1(input string) int {
+	var leftList, rightList []float64
+	total := 0.0
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		sides := strings.Fields(line)
+		leftNum, _ := strconv.ParseFloat(sides[0], 64)
+		rightNum, _ := strconv.ParseFloat(sides[1], 64)
+		leftList = append(leftList, leftNum)
+		rightList = append(rightList, rightNum)
+	}
+
+	sort.Float64s(leftList)
+	sort.Float64s(rightList)
+
+	for i := 0; i < len(leftList); i++ {
+		total += math.Abs(leftList[i] - rightList[i])
+	}
+	return int(total)
+}
+
+func Part2(input string) int {
+	var leftList, rightList []int
+
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		sides := strings.Fields(line)
+		leftNum, _ := strconv.Atoi(sides[0])
+		rightNum, _ := strconv.Atoi(sides[1])
+		leftList = append(leftList, leftNum)
+		rightList = append(rightList, rightNum)
+	}
+
+	counts := make(map[int]int)
+	for _, num := range rightList {
+		counts[num]++
+	}
+
+	similarityScore := 0
+	for _, num := range leftList {
+		similarityScore += num * counts[num]
+	}
+
+	return similarityScore
+}

2024/gareth/day01/day01_test.go

@@ -0,0 +1,27 @@
+package day01
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`3   4
+4   3
+2   5
+1   3
+3   9
+3   3`)
+	assert.Equal(t, 11, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`3   4
+4   3
+2   5
+1   3
+3   9
+3   3`)
+	assert.Equal(t, 31, r)
+}

2024/gareth/day02/day02.go

@@ -0,0 +1,76 @@
+package day02
+
+import (
+	"math"
+	"strconv"
+	"strings"
+)
+
+func Part1(input string) int {
+	total := 0
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		var report []int
+		nums := strings.Fields(line)
+		for _, num := range nums {
+			intnum, _ := strconv.Atoi(num)
+			report = append(report, int(intnum))
+		}
+		if isSafe(report) {
+			total++
+		}
+	}
+	return total
+}
+
+func Part2(input string) int {
+	total := 0
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		var report []int
+		nums := strings.Fields(line)
+		for _, num := range nums {
+			intnum, _ := strconv.Atoi(num)
+			report = append(report, int(intnum))
+		}
+		if isSafeWithDampener(report) {
+			total++
+		}
+	}
+	return total
+}
+
+func isSafe(report []int) bool {
+	increasing := report[1] > report[0]
+	decreasing := report[1] < report[0]
+
+	for i := 1; i < len(report); i++ {
+		diff := report[i] - report[i-1]
+		absDiff := int(math.Abs(float64(diff)))
+
+		if absDiff < 1 || absDiff > 3 {
+			return false
+		}
+
+		if (diff > 0 && !increasing) || (diff < 0 && !decreasing) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func isSafeWithDampener(report []int) bool {
+	if isSafe(report) {
+		return true
+	}
+
+	for i := 0; i < len(report); i++ {
+		modifiedReport := append(report[:i], report[i+1:]...)
+		if isSafe(modifiedReport) {
+			return true
+		}
+	}
+
+	return false
+}

2024/gareth/day02/day02_test.go

@@ -0,0 +1,27 @@
+package day02
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9`)
+	assert.Equal(t, 2, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9`)
+	assert.Equal(t, 4, r)
+}

2024/gareth/day02/poc.py

@@ -0,0 +1,45 @@
+def is_safe(report):
+    increasing = report[1] > report[0]
+    decreasing = report[1] < report[0]
+
+    for i in range(1, len(report)):
+        diff = report[i] - report[i - 1]
+        abs_diff = abs(diff)
+        if abs_diff < 1 or abs_diff > 3:
+            return False
+        if (diff > 0 and not increasing) or (diff < 0 and not decreasing):
+            return False
+
+    return True
+
+def is_safe_with_dampener(report):
+    if is_safe(report):
+        return True
+    for i in range(len(report)):
+        modified_report = report[:i] + report[i+1:]
+        if is_safe(modified_report):
+            return True
+
+    return False
+
+def read_reports_from_file(filename):
+    reports = []
+    with open(filename, 'r') as file:
+        for line in file:
+            report = list(map(int, line.split()))
+            reports.append(report)
+    return reports
+
+def main():
+    filename = 'input.txt' 
+    reports = read_reports_from_file(filename)
+
+    safe_count = 0
+    for report in reports:
+        if is_safe_with_dampener(report):
+            safe_count += 1
+
+    print("OUTPUT:", safe_count)
+
+if __name__ == "__main__":
+    main()

2024/gareth/day03/day03.go

@@ -0,0 +1,49 @@
+package day03
+
+import (
+	"regexp"
+	"strconv"
+)
+
+func Part1(input string) int {
+	total := 0
+
+	regex := regexp.MustCompile(`mul\((\d+),(\d+)\)`)
+	matches := regex.FindAllStringSubmatch(input, -1)
+
+	for _, match := range matches {
+		if len(match) == 3 {
+			x, _ := strconv.Atoi(match[1])
+			y, _ := strconv.Atoi(match[2])
+			total += x * y
+		}
+	}
+	return total
+}
+
+func Part2(input string) int {
+	total := 0
+	isEnabled := true
+
+	mulRegex := regexp.MustCompile(`mul\((\d+),(\d+)\)`)
+	doRegex := regexp.MustCompile(`do\(\)`)
+	dontRegex := regexp.MustCompile(`don't\(\)`)
+
+	tokenizeRegex := regexp.MustCompile(`(mul\(\d+,\d+\)|do\(\)|don't\(\))`)
+	tokens := tokenizeRegex.FindAllString(input, -1)
+
+	for _, token := range tokens {
+		if doRegex.MatchString(token) {
+			isEnabled = true
+		} else if dontRegex.MatchString(token) {
+			isEnabled = false
+		} else if mulRegex.MatchString(token) && isEnabled {
+			mulMatch := mulRegex.FindStringSubmatch(token)
+			x, _ := strconv.Atoi(mulMatch[1])
+			y, _ := strconv.Atoi(mulMatch[2])
+			total += x * y
+		}
+	}
+
+	return total
+}

2024/gareth/day03/day03_test.go

@@ -0,0 +1,17 @@
+package day03
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))`)
+	assert.Equal(t, 161, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))`)
+	assert.Equal(t, 48, r)
+}

2024/gareth/day03/input.txt

@@ -0,0 +1,6 @@
+-:-]what()(+/mul(957,396)?mul(550,844)%+why())-? #}from()mul(488,628)%} ~**mul(770,931)$~mul(791,733)<{mul(985,350)<#why()don't()what()select()$what())]what()who()mul(327,185))<^^mul(542,68)#?who()<from()';^how()mul(619,952)/where(){(!);'@,mul(551,161)select()>when()do()from()mul(51,291)[where()!{]/}'@?mul(233,511)@what()]mul(311,967))&who()how()mul(839,578)^who()]}mul(266,735){mul(176,670)mul(154,710)*select()](':^,mul(531,801)# *why()why()mul(30,325)~,where();select()select()}-/when()mul(512,729)+where();[mul(720,339)[~*when()mul(722,867)!);{+mul(582,286)^:)what()@mul(604,485) (who()why()who()from()[mul(128,295)how()?!%~~<what()mul(156,267)'how(689,161):where()mul(206,221) mul(835,81);] %mul(562,798)^{%where()mul(38,166)#!what()mul(185,550)^! ?,+;}}mul(685,101)select()mul(316,869)>[~}{[&;mul(548,186))(%];mul(841,290)when()where()'?mul(646,803)mul(553,782)how()when()-mul(569,604)@ ++:/%why()]select()mul(257,598)#mul(897,819)how()what()from()how()]when()~/!}mul(856,271)+&why(){}why()>who()mul(373,408)-who()^&%>';,when()mul(54,88)what()!mul(663,711)$#(?;^from()mul(898,810)when()from()%@mul(776,102)why()mul(303,842)!/,%<^;mul(840,791){[@mul(909,714)don't()>who()why()from(545,686)%~mul(483,956)^'why()from()where()$>*:mul(931,649) mul(800,313)):mul(31,69)mul(549,670)$;mul(327,976)@who()^mul(627,907)/[@what(925,706) ;^who()!mul(629,813)when(){$&where(){#mul(504,147)?mul(222,429)#who()*/!select()<what()mul(310,934)])^/$]mul(917,911)-%how()?[;,mul(823,273)*[~select()/select()~%mul(703,815)what()where()?what():'?[who()mul(966,52)how()&-~(%[(^mul(913,694)mul(190,570),&<%'from()where()what(979,309):+mul(662,926)/<!when()'select(),/&*mul(655,410) how()}mul(386,934)where()[mul(159,595)@']from()when()#?@mul(356,559)&)>?$ mul(439,336)?from()*select()*}when()]who()mul(148,356)(who()+mul(271,905)mul(564,172)@?(~mul(628,470)#} mul(301,170)?@,^don't();&:^&how(605,264))(what()'mul(896,108),$mul(413,431):<>where();how()>!}when()do()!}/&:when()>mul(754,737)~:#:* mul(962,620)}mul(26,490)!~,mul(450,234){/]who() <;{mul(938,932)?--#%};}mul(140,314)(-}/,[mul(202,839)^why()-!},mul(459,716),mul(600,932)}when()]who()}who())&mul(752,142$mul(174,573)mul(231,182)from()mul(308,661)what()} mul(178,99)&^*[(mul(858,730)~}from()^mul(17,545)what()~{~*^what(90,714)how(),mul(63,969)-]mul(364,49);mul(130,598<:&why()select(879,794)mul(46,169)>&how()%mul(564,506)/what(255,868)mul(415,375)':@who()mul(525,772)<$mul(277,787)[~mul(314,321)'&@$^%mul(741,325)?(%#;*mul(459,703)why()~what()mul(250,38)what()<-$)when()%(don't()mul(296 ',mul(673,933)?#<@who()from()^?mul(831,912)?/*mul(407,853)mul(119what()why()>mul(816,762) how()<}~from()how()/@:mul(792,799)()@?%:$:mul(289,264)
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+mul[!-,why()(?mul(770,624)~:mul(197,580){{(%mul(678,337)what()mul(951,457)'<#mul(679,253)?do()who();&  who()select()mul(105,231)+{&!when()who()how()!')mul(262,609)):,{'from()/?@}don't()*:mul(471,462):([(@;from()mul(734,965)/&/where()mul(885,324)why(){>/#<:mul(390,818)!mul(684,730)*>>{[!what()what()mul(824,893)mul(801,597/why()!when()how() '>from()%mul(165,825)who(837,795)?? why(187,949)mul(703,551) when()'mul(759,898)select()#$$  where()where()mul(694,292)%(who()%#}mul(884,767)^<mul(900,512)^what(862,782)%*}mul(484,385)]where()where()mul(593@{what()?{{@&who()^*mul(511,975)+%from(193,630)@-~how()/<mul(161,30)mul(462,217)mul(283,656)when()mul(733,613)what()^what()why()/where()what()^!mul(777,858)^select()mul(732,203)how()<mul(574,457)select()where()$who()when()~where()#}mul(525,448)*mul(5,230)mul(347,280)<from()#what()mul(613,165)@who(609,769)@~/,%#;*mul(298,242)what()+~when():($-(mul(118,981)mul(72,529)$^~select(306,809),!/(mul(864,257))what()-?mul(308,631)? //*&,/!don't())>:$mul(945,214) where()how(837,748)(mul(537,489)(%{mul(594,245)who()from()from()%}!)])why()mul(832,704)^~mul(902,18)how()what()who()/#'-#mul(345}who()when()?]&^mul(873,161)^mul(81,518)]$mul(875,700)how()where()(mul(735,369)/-< why()@>mul(703,274)-<mul(949,449)what()+(>from()when()**,)mul(204,896)]+mul(28,596);why()#select()'#]mul(774,171< why() !from()mul(29,711)mul(28,600)}when()!@(^why()~{mul(555,761)%}do()from()-mul(139,179){how()'?mul(294,354)}where()mul(317,957)]select()#;where() where()^@from()mul(461,831)~who(75,120)%who()@-&;,)mul(563,131)mul(607,401)select())from())&,mul(26,412)select(726,797)&)how()@select()mul(416,615)(what()select()!()<<what()who(299,911)mul(628,777){mul(712,971)(*]what()from()<>#;&mul(921,158)>- mul(245,598)select()what()*({mul(468,522)]^select(574,638)]@};do()from(799,930)%who()#:[how()mul(413,674)[how()*mul(327,432)%?@'mul(486,644)}~>-mul(637,16)how(254,818){%where()#where()who():who()mul(431,749)$$where(228,303)<!why(109,819) ]mul(693,21) where(396,89)[mul(60,538){mul(738,595))-&why()how()why()(mul(698,770))*>,%+&mul(593,337)}#:where(){why()[+&!mul(520,180)^mul(723,959)mul(492,739){/?mul(327,463)?-select()-<,mul(102,950)!#do()@when()-when()},select()/mul(274,979/from())who()(~)!^$mul(78,739)why()@{~mul(819~?~+]>@mul(824,208)}mul(338,41)where() &*;;&what()mul(888,646)from(),$:-who(263,596)!!-from()mul(396,204)>{)>{?(%{mul(885,937);!what()&%!<mul(178,507)mul(833,974)^mul(842,332)>from()}mul(207,417)(<;what()mul(187,893)((&&}&why()*)-mul(589,985)^how(310,10)when(),]:mul(989,534)$where()mul(552,604;(!;select(){){where()#mul(152,511)+/$!;+/<+]mul@select()::when()who()how()!what()mul(446,994)from()<}what()select()'why(244,102)+<select()mul(516,369)]&mul(707,483):@}%?what()from()don't()mul(407,712)$:{&:,,,?mul(112,3)-~- what()>)%}who()mul(693,903)?*/}select()mul(282,115)[];why(){mul(925,276)how()&{what()&$when()&-!mul(191,385)*)mul(446,703)[>what()?*}what()^who()*mul(997,718)!>$)@,^*)mul(788,724)from()#&]~/<,)how()mul(181,531)[(why()[mul(409,206)what(604,231) when()why(921,229)]>where()//mul(199,96)when()why()#!/usr/bin/perl~%>~ &:mul(239,884)
+what())[$^+why()mul(118,89)mul(689,203)#,,what()what()mul(633,394)from();~from()!where()*?@mul(568,753)/[+when()?%:mul(828,475)what()don't()-;@ mul(509,544)[when()};<+'(mul(235,757)<+:%select():mul(241,373)$mulselect() (%where()where()]-)mul(306,62)from()what()mul(285,414)!*&&>who()#mul(543,866)/~select()[+don't()/><why()from() ~#mul(983,515)#mul(731,258)mul(894,831){>)where()!when(),'mul(701,189)/';!:]+how(902,507)-^mul(847,104)mul(883,112){'~}&mul(697,190)what()%![!<where()@why(319,27)select()mul(468,827)/mul(914,407@ where(661,684)mul(850,467);don't(){what()##*%mul(175,88)>(why()@^where()who()mul(843,4)%what()&-%mul(945,389)#<)select()mul(690,755):mul(774,780)}mul(940,623)%where() ?where()(}^!mul(34,627)mul(479,281)#}>what(157,964)select(){how()why()<don't()(*>+who(640,716),mul(117,249)mul(395,14)-]( ~(how()-mul(220,860)+^mul(765,74)select(),$who()<mul(685,855)!what()where()why()#{,-;mul(302+^(who()]from()~<?where():mul(383,623)::~(>,@mul(639,551);(mul(26,80)why(480,988)^why():? <[mul(672,116@mul(316,879)}mul(498,582)  @,:{'why(589,887)mul(39;]mul(855,31)^from()?mul(93,510)mulwho(){@-what()<where()~select()mul(225,679) 'mul(305,662)/:,mul(887,727)?:~:&/select()#:<mul(755,830)^#}+@)how()?^mul(14,79)-mul(433,926)what()'mul(458,711)>from();where()from()~:(mul(688,799)~when()>from()-select()who()~<mul(71,560)( who()? +#^who()[mul(70,477)}>#+{ >mul(275,916)#?-mul(359,865)where(441,672)'}what()[from()when()<>who()mul(909,227)$:!'mul(330,478)!?[;(+#what(919,466)&/mul(73,181)[{how()mul(403,182);mul(249,968):!from()?!{#-mul(661,975)!-;}'mul(999,285)select(565,140)+>@,$:from(47,825)~!mul(599,436))<when(603,518)@mul(567,365)?(}}where()<{:who()?mul(755,613) <*who()mul(448,608)$$mul(507,887)mulwhen()]when()^$+@();+mul(846,707)]mul(932,511)who()}}where()#mul(122,316)#>+ [>%!mul(959,617)mul(5,150)where()@;&mul(630,775)<select(686,710)who()/';[*%select()mul(859,837)'mul(451,3)(when()($/+mul(499,794){]mul(194,78)from()'?don't();mul(47,314){who()~/]mul(526,464)why(666,133)#}/;]:mul(223,721)how()><&-:;mul(114,820[don't()when()#how()mul(976,290;+-from()where()]mul(338,47)when()what()where()%]mul*who() #+what()mul(679,324)mul(859,321)%'mul(446,297),#select();<mul(797,938)who()mul(531,845)}*select()@{mul(661,677)/)'*mul(837,800)<who()select()<]}<@mul(844,594))when()where():'mul(75,307)mul(676,67)(]what()<select()?mul(851,92)+&)mul(683,41)?<,/:~'mul(179where()from()~<mul(674,897)/!how(529,298) *[}from(),mul(362,131)}! % $mul(168,955)mul(517,218)[(,mul(740,567)}~[)$@from(),do();]mul%/%]why()mul(777,920)what()what()$;<what()mul(307,462)-+from()what()/$select()select()do()<select()&from()why()why()&mul(522,562))<how()-!+when(413,672)&)mul(621~(?select()<*-why()mul(372,852)}]~mul(668,335)mul(512,514){%mul(873,547)[*(mul(887,814)]>';from()mul(206,301)why()-'mul(87,734)<where()+:mul(844,819){#^^mul(130,409)[('@what() ;mul(916,629)@@who()-?}mul(320,288)what()?mul(184,677)[@#select()+::-select(929,36)/mul(329,568)
+{^mul(75)<:from(){select()select()mul(833,211):[-'mul(702when()who(21,237)+)&!>mul(735,118)] {/what()*@^what()where()mul(685,883)when()what()mul(91,84)}]<select()why(795,767)@why()]}$mul(711,291)select()--+<*who()mul(898,469^how()>-~where(){when(374,912)$do()>~,' how()mul(67,939),)&~@where()(mul(923,997)~,*$when()[from()from()mul(699,705)~/when()+}mul(214,775)'%mul(715,142)-;mul(290,853)from()$why()what()select()-@-mul(682,729)+^$}, !mul(197,39)mul(269,573)@^mul(819,945)/select()-do()%$~'#select() 'mul(64,956)[who()*who()@,)>+}mul(519,356);*/%>why()[[)mul(184,666)what()mul(892,160)+*&where(764,214)--]?(>mul(996,338)>when()what()]))&?mul(865,864))?@[::when()>what()>mul(218,296)&)%:<?mul(903,712),+mul(102,86)' ^,[>[~why()how(416,393)mul(118,100)from()select()#: $mul(7,742)how()&~how()>who()^mul(667,218)?/mul(218,898)!:$from()>mul(746,995)(+select()] when()}mul(971,429), !,&mul(505,165):!-)?-how()from()%mul(921,456)@mul(491,404)#how()-mul(284,834)#?(mul(667,960)]where():how()what(963,920)% what()don't())mul(236,336) why()why()select()where()^mul(33,901)mul(253,866)<#>$]%-mul(216,512),)from()what()what(464,183)where()select()@'}mul(98,640)' :)what()$%~#/mul(283,893)(mul(520,959)#^?{>@*when()when()]mul(80,420)where()mul(751,106)when()when()! how()mul(148,813)@><^[mul(740,246) how()where()!!/mul(242,262) who()who()%,mul(308(#/when()$mul(359,332)from()why()from()~$$^where()@mul(270,445)why()}%mul(623,449)where()how()?& />mul(759,849)-} (mul(84,200),$;who()[!mul(934,76)(@^:where()why()/'mul(650,46)[mul(105,265):)when()+ &'what()^mul(334,290)] $what()/mul(930,226,>^!%don't()mul(243,460){'#/what()+/mul(437,684)mul(501,579)/mul(243,174)mul(988( +<#where(206,306)where()[,from()mul(331,170)(?^~}#mul(940,949)>(,*+mul(925,961)^*from()select()^--^)(mul(994,182)+'+mul(153,816)~<!?[mul(31,276)don't()how():/!*] !^~mul(404,438)from()<]?)})>&mul(260,998)~:],],who()why(348,109)why()<don't()]#?)select()<<where(999,395)mul(342,366);what()select()~&~mul(120,353)when()]mul(198,41)][;(]:select()-[mul(947,937)$$when()-{mul(672,675);/!mul(14,647)>who()when(290,863)why(735,89)!from()@ >#mul(205,831)'$ %'mul(981,644)!<mul(100,956):{#select()#*mul(168,493)who()-%)#;{don't()^]who()~~ *mul(47,958)mul(130,976)how()~how()?what();mul(983who()(why()/)},]*:/mul(374,969)>#,*>mul(910,535))[who()#mul(220,934)how(271,592)-,*$,+mul(11,63)mul(783,580)^&*}~<mul(677,425))select()when()/how()mul(181,298)??why()how()&/mul(670,720)/@!when()where()#mul(403,306)]from()(from()why()*why()don't()^~from()[select()who()select()mul(516,37)what())}-*>(;from(){mul(21,444$what(274,202)<where(),}mul(706,78);select(275,134)]{&}why())@mul(302,87)[@[who()!when())mul(196,98)mul(918,675):,>how()mul(293,78)mul(189,814)#{}why(80,738)}from()mul(456,691)*@{(,[%mul(916,89)how())(]@mul(524,412)];:(mul(374,851)where()[mul(473,999)select()$what()}don't();];(}mul(327,69)%&+;:/what()don't()-%,'()mul(377,536)mul(31,322))@what()^select()mul(719,58)$why()~&what()']}mul(39,890)(+<#who(){how()!<mul(559,894);-&what()from()#$do()mul(256,3)where()^how()when()$:<what() mul(664^-from()}mul(469,922)from()>mul(299,824)(]](+mul(205,11)
+{mul(602,646)!% ^mul(384,953)do()&&:]<<select()#<mul(766,701)&@(what()who()+>mul(228,736){({}don't()-when()@*>-mul(278,494))/&<mul(596,290)select()when()),{ ~mul(563,584)mul(351,221)how():#where()[{%what(128,820)[ mul(754,363)!{)how()&''from()mul(388,712)?;'>?><(select()mul(916,219)select(),:{(<*mul(360,209)why();~}where()-(,mul~when()when()!where()@:;:#/do()select()select()!,how(972,480)~-how()who()mul(726,867):>mul(549,954)](how(802,821)select()how()[+^mul(535#select()}why()[what()]why()*{#mul(72,525)mul(809,41who()!~where(82,230)}mul(961,563)}who()what(417,588)<how()mul(756,106)!)when() [mul(733,591)how()[why(),<+@,mul(889,603)when()when()mul(60,212)mul(955,930)]~&)/!}-}&mul(206,66)where(882,366)~/<{mul(745,261)'<where()<why();select()(how()mul(74,146)where():~who()what()>&*mul}{,+?%^[when(34,108)who()mul(71,111)$+,}#~-<mul(265,932)]$what();^mul(775,136)mul(192,60)how(){)mul(212,476<who()?mul(264,266)[,^&/how(215,234)mul(447,79)!!+;,who()@{mul(897,924)^what()-%((don't()mul(259,393)who()when(956,639)&where()]@{,mul(637,712)%(mul#'select()!~<+<do(),#&<:% -{)mul(914,330)when()-)?@]{where(240,411)*select()mul(191,984),%?-what()+{mul(623,7)+mul(899,145)</why()select()what()<{~mul(849,743)!where() mul(43,318)when()!~$)mul(607,51)!?<mul(123,500)<]how()!what(){(mul(380,536),mul(367,657)~{,why()?-*$mul(589,520)(#mul(568,853)!-how()'^what()}'^mul(924,205),};'/^!!@mul(765,625)*!+where()[@select()-~do()!!,who()+%mul(369,495)()/mul(530,282)mul(148,870)]*where()mul(668,764)%who()how()how()&![who()mul(678,727)>^]@ when(){:@mul(545,335) &how()from()<:mul(958,59)$ (what()mul(886,155)how()&+mul(525,132)<&}who(502,340)select()when()#^mul(339,398)who(),(how())@@how()$$mul(831,852)when()don't()>mul(935,45) select(930,598)!:select()mul(693,62)(mul(681,508)how()^@*;)mul(235,731)who(468,32)#~>don't()#:what()where()when()~<who()-/mul(137,827)!who()!why()mul(806,939)from()mul(492,899)why()^),who()]#from()$ mul(384,731)>~^>@#{mul(2,62)mul(866,617),>% mul(806,586)how():{/mul(669,407)!/mul(457,522)mul(40,474)>)]select()who()}mul(451,794)]#mul(115,471)~mul(331,456)@^who(){#when()mul(672,70)where()who())(#how()what()!mul(438,748)-/mul(605,224)mul(46,34)~?'</'$#how()&mul(278,426) mul(710,864)mul(296,109);mul(481,73)&<,]mul(650,979) mul(575,478)how()$@%#;mul(319,368)][select()where()/ /,:when()mul(399,630)from()mul(9,26)~'do()mul(953,316)%''%{>mul(650,523)?mul(871,731)?%from(966,980)>when()mul(790,779) from()#$:,'mul(428,763)@# why()mul(724,6)select() ,mul(208,11)why()how()mul(287,562)$[:select()},?mul(531,36)/mul(12,351)#$+,:#:$when():mul(941,380)-[from()!)?-select()mul(102,544)when();~{select()~^;-do() ]who()from(),<who()]/>mul(959,599)>why()/,<%-,!mul(517,558)%])$mul(945,968)mul(854,265)?<when()mul(98,913)<&&}]+mul(830,92)where()]why(132,949)why()from()when()'when();{mul(615,131)(,;}^~!mul(973,226)how()^}){}mul(45,238) where()#)'!~ <

2024/gareth/day04/day04.go

@@ -0,0 +1,91 @@
+package day04
+
+import (
+	"strings"
+)
+
+var directions = [8][2]int{
+	{0, 1},
+	{0, -1},
+	{1, 0},
+	{-1, 0},
+	{1, 1},
+	{1, -1},
+	{-1, 1},
+	{-1, -1},
+}
+
+func Part1(input string) int {
+	grid := parseInput(input)
+	return countXMAS(grid)
+}
+
+func Part2(input string) int {
+	grid := parseInput(input)
+	return countXMASPatterns(grid)
+}
+
+func parseInput(input string) [][]rune {
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+	grid := make([][]rune, len(lines))
+	for i, line := range lines {
+		grid[i] = []rune(line)
+	}
+	return grid
+}
+
+func countXMAS(grid [][]rune) int {
+	rows := len(grid)
+	cols := len(grid[0])
+	target := "XMAS"
+	total := 0
+
+	for r := 0; r < rows; r++ {
+		for c := 0; c < cols; c++ {
+			for _, d := range directions {
+				dr, dc := d[0], d[1]
+				found := true
+
+				for k := 0; k < len(target); k++ {
+					nr := r + k*dr
+					nc := c + k*dc
+					if nr < 0 || nr >= rows || nc < 0 || nc >= cols || grid[nr][nc] != rune(target[k]) {
+						found = false
+						break
+					}
+				}
+
+				if found {
+					total++
+				}
+			}
+		}
+	}
+	return total
+}
+
+func countXMASPatterns(grid [][]rune) int {
+	rows := len(grid)
+	cols := len(grid[0])
+	total := 0
+
+	for r := 1; r < rows-1; r++ {
+		for c := 1; c < cols-1; c++ {
+
+			topLeft := grid[r-1][c-1]
+			topRight := grid[r-1][c+1]
+			center := grid[r][c]
+			bottomLeft := grid[r+1][c-1]
+			bottomRight := grid[r+1][c+1]
+
+			if center == 'A' && ((topLeft == 'S' && topRight == 'S' && bottomLeft == 'M' && bottomRight == 'M') ||
+				(topLeft == 'S' && topRight == 'M' && bottomLeft == 'S' && bottomRight == 'M') ||
+				(topLeft == 'M' && topRight == 'M' && bottomLeft == 'S' && bottomRight == 'S') ||
+				(topLeft == 'M' && topRight == 'S' && bottomLeft == 'M' && bottomRight == 'S')) {
+				total++
+			}
+		}
+	}
+
+	return total
+}

2024/gareth/day04/day04_test.go

@@ -0,0 +1,35 @@
+package day04
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX`)
+	assert.Equal(t, 18, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX`)
+	assert.Equal(t, 9, r)
+}

2024/gareth/day04/input.txt

@@ -0,0 +1,140 @@
+XASXMAXXMSXXSMMSXMMSMXSMXMSSMSSSMMSMAMXMXSMMMMAXAMXSASXSSMMSSMXAMXMSAMXMMXAXXXSAMXXXXXMMXSXMXXSMASAMXMXAXXMASAMXXXMAMMMSXSXMXMMMSAASXSMSSMMS
+XASAMSSMAMMMAMAAAMASMAMAAXMASAAASAAMAMAMAAAAASMSSSSMAXAAAXASASMMMMMMXMASXMAMXXXXSMSMSXSAAXAMXMASMXMMSMSAXSXMMSXSMMAAMXAMAAMMAAAAXMXSAAAAXAAM
+MXSXMAAMXAAAXMMSSMAXMASXSSSSMMSMMSXSASMSMSSMMMAAAXXXXMMMMMXXAMMAAAASMMAAAXMASMXXXAAASAMMXSASASMMMAMXSASASASMAXXMAMSSSMSSMMAXSMMSXMMMMMMMXAMX
+SAMMMSSMMXXSXXXAAMSMSASXAAXMXXAAXXXMAXAAAXXMASMMMMMMXMXXXXSMXMSSMSASASMMXMMXMAAMASMSMSMAASXSAAAASAXAMAMXAAXMASMSSMXAMMMAMXSAMAMAASXMMSSMSAMX
+MASAAAAMSMMMMMMSMMMAMAXMMMMMXMSSMMXMSMMMMMAMXASAXAASXMMASAAXAXAXMXMXMXAASXMAMSXSAMMXMMMMMSAMXMSMSMSMMAMSMXMMASAMXAMMSASAMMXASAMSXMAMXAAXSAMA
+SSMXMSMAAMAAXXAMXASMMSMAMXSXSAMXXMAAAAXSXSAMXMASMSXMASXAMSAMXMMMSASMXMXMMAMSMXAMASXMXAASXMMMMXMMXAAXXAMXXAAMAMAMXXXASXSASXMMSAMMASXMMMMMMMMS
+XXXXMAMMMSSSMXSXSASXAXSXMASAMXSMXMASMSMSXMASXXMMXMXSAMMXMAXAMAXXSXSAASMASXMXAMXMMMAASMXXAMXMMAXMXMSMSAMSSMSMMSSSSMMMSXMXMASXSMMXAXAXSSSMXAAX
+MMXSSXSMXAMAMAAAMSXMXMMXMASXMMSAMXXAAMXSASAMMXXSXMXMASXSSSMXSSMXXMXMMSAXMASMMMSMASAMXMASXSAMSSMSMAAAMAMAXAMAMAMXAXAXSAMXMXAXMMSMMSXMAAAMSAMX
+AXMXMASMMASAMXSXMMXSAMAAMXMMMAXMMSMMXMASAMXSXMXMAAMAMSAMAAAMSAMMSXMXSXMXAXMASAMXAXMASXMAMMAMAAASMMMSSSMSSMXSAMXSMSMXXAMXSSMASAMAMMASMMMASMMM
+XMAMSXSASASASMXXMAMMAASXSAAAMMXAAXXAMMMMSMSMXMAXMXMAMXAMSMMMSAMASAMXSAMMMMXMMAMMSXXAMAXXAMSMMSMMAXXXMAAAAMAMAXXAMXXSMSAXAAXAMMMAMSXMAXXMSASX
+MSSMXASAMXSMMMAXASMSMMAXMAMSASXMAXMMSAXSASAAASMXMASMSSMMMAAXSAMMSAMAMAMMSAMSSSMSAMMSSSMSMXMAXXASXMMMMMMMSMASASXSXMASAXXMSSMMXMXMMMMSAMMXSAMX
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2024/gareth/day05/day05.go

@@ -0,0 +1,134 @@
+package day05
+
+import (
+	"strconv"
+	"strings"
+)
+
+type Rule struct {
+	X, Y int
+}
+
+func ParseInput(input string) ([]Rule, [][]int) {
+	sections := strings.Split(input, "\n\n")
+
+	ruleLines := strings.Split(strings.TrimSpace(sections[0]), "\n")
+	var rules []Rule
+	for _, ruleLine := range ruleLines {
+		parts := strings.Split(ruleLine, "|")
+		x, _ := strconv.Atoi(parts[0])
+		y, _ := strconv.Atoi(parts[1])
+		rules = append(rules, Rule{X: x, Y: y})
+	}
+
+	updateLines := strings.Split(strings.TrimSpace(sections[1]), "\n")
+	var updates [][]int
+	for _, updateLine := range updateLines {
+		parts := strings.Split(updateLine, ",")
+		var update []int
+		for _, part := range parts {
+			page, _ := strconv.Atoi(part)
+			update = append(update, page)
+		}
+		updates = append(updates, update)
+	}
+
+	return rules, updates
+}
+
+func ValidateUpdate(update []int, rules []Rule) bool {
+	indexMap := make(map[int]int)
+	for i, page := range update {
+		indexMap[page] = i
+	}
+
+	for _, rule := range rules {
+		pageX, indexX := indexMap[rule.X]
+		pageY, indexY := indexMap[rule.Y]
+		if indexX && indexY && pageX > pageY {
+			return false
+		}
+	}
+
+	return true
+}
+
+func FindMiddle(update []int) int {
+	n := len(update)
+	return update[n/2]
+}
+
+func SortUpdate(update []int, rules []Rule) []int {
+	depen := make(map[int][]int)
+	for _, rule := range rules {
+		depen[rule.Y] = append(depen[rule.Y], rule.X)
+	}
+
+	visited := make(map[int]bool)
+	var sorted []int
+
+	for _, page := range update {
+		if !visited[page] {
+			sorted = Visit(page, depen, visited, update, sorted)
+		}
+	}
+
+	return sorted
+}
+
+func Visit(page int, depen map[int][]int, visited map[int]bool, update []int, sorted []int) []int {
+	if visited[page] {
+		return sorted
+	}
+	visited[page] = true
+
+	for _, d := range depen[page] {
+		if contains(update, d) {
+			sorted = Visit(d, depen, visited, update, sorted)
+		}
+	}
+
+	sorted = append(sorted, page)
+	return sorted
+}
+
+func contains(slice []int, element int) bool {
+	for _, item := range slice {
+		if item == element {
+			return true
+		}
+	}
+	return false
+}
+
+func Part1(input string) int {
+	rules, updates := ParseInput(input)
+	total := 0
+
+	for _, update := range updates {
+		if ValidateUpdate(update, rules) {
+			total += FindMiddle(update)
+		}
+	}
+
+	return total
+}
+
+func Part2(input string) int {
+	rules, updates := ParseInput(input)
+	var invalidUpdates [][]int
+	total := 0
+
+	for _, update := range updates {
+		if !ValidateUpdate(update, rules) {
+			invalidUpdates = append(invalidUpdates, update)
+		}
+	}
+
+	for _, update := range invalidUpdates {
+		sortedUpdate := SortUpdate(update, rules)
+		total += FindMiddle(sortedUpdate)
+	}
+
+	return total
+}

2024/gareth/day05/day05_test.go

@@ -0,0 +1,71 @@
+package day05
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`47|53
+97|13
+97|61
+97|47
+75|29
+61|13
+75|53
+29|13
+97|29
+53|29
+61|53
+97|53
+61|29
+47|13
+75|47
+97|75
+47|61
+75|61
+47|29
+75|13
+53|13
+
+75,47,61,53,29
+97,61,53,29,13
+75,29,13
+75,97,47,61,53
+61,13,29
+97,13,75,29,47`)
+	assert.Equal(t, 143, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`47|53
+97|13
+97|61
+97|47
+75|29
+61|13
+75|53
+29|13
+97|29
+53|29
+61|53
+97|53
+61|29
+47|13
+75|47
+97|75
+47|61
+75|61
+47|29
+75|13
+53|13
+
+75,47,61,53,29
+97,61,53,29,13
+75,29,13
+75,97,47,61,53
+61,13,29
+97,13,75,29,47`)
+	assert.Equal(t, 123, r)
+}

2024/gareth/day06/day06.go

@@ -0,0 +1,142 @@
+package day06
+
+import (
+	"strings"
+)
+
+type Point struct {
+	x         int
+	y         int
+	direction int
+}
+
+const (
+	Up    = 0
+	Right = 1
+	Down  = 2
+	Left  = 3
+)
+
+var rows, cols int
+
+var moves = []Point{
+	{-1, 0, Up},
+	{0, 1, Up},
+	{1, 0, Up},
+	{0, -1, Up},
+}
+
+func Part1(input string) int {
+	grid, start, direction := ParseInput(input)
+	total := PredictPath(grid, start, direction)
+	return total
+}
+
+func Part2(input string) int {
+	grid, start, direction := ParseInput(input)
+	total := FindLoopingPositions(grid, start, direction)
+	return total
+}
+
+func ParseInput(input string) ([][]rune, Point, int) {
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+	rows = len(lines)
+	cols = len(lines[0])
+	grid := make([][]rune, rows)
+
+	var start Point
+	var direction int
+
+	for i := 0; i < rows; i++ {
+		grid[i] = []rune(lines[i])
+		for j, char := range lines[i] {
+			if char == '^' {
+				start = Point{i, j, Up}
+				direction = Up
+			} else if char == '>' {
+				start = Point{i, j, Right}
+				direction = Right
+			} else if char == 'v' {
+				start = Point{i, j, Down}
+				direction = Down
+			} else if char == '<' {
+				start = Point{i, j, Left}
+				direction = Left
+			}
+		}
+	}
+
+	return grid, start, direction
+}
+
+func PredictPath(grid [][]rune, start Point, direction int) int {
+	visited := make(map[Point]bool)
+	current := start
+
+	visited[current] = true
+
+	// do while
+	for {
+		next := Point{current.x + moves[direction].x, current.y + moves[direction].y, Up}
+
+		if next.x < 0 || next.x >= rows || next.y < 0 || next.y >= cols {
+			break
+		}
+
+		if grid[next.x][next.y] == '#' {
+			direction = (direction + 1) % 4
+		} else {
+			current = next
+			visited[current] = true
+		}
+	}
+
+	return len(visited)
+}
+
+func FindLoopingPositions(grid [][]rune, start Point, direction int) int {
+	possiblePositions := 0
+
+	for i := 0; i < rows; i++ {
+		for j := 0; j < cols; j++ {
+			if grid[i][j] != '.' || (i == start.x && j == start.y) {
+				continue
+			}
+
+			grid[i][j] = '#'
+			if IsLooping(grid, start, direction) {
+				possiblePositions++
+			}
+			grid[i][j] = '.'
+		}
+	}
+
+	return possiblePositions
+}
+
+func IsLooping(grid [][]rune, start Point, direction int) bool {
+	visited := make(map[Point]int)
+	current := start
+
+	step := 0
+	for {
+		step++
+		next := Point{current.x + moves[direction].x, current.y + moves[direction].y, direction}
+
+		if next.x < 0 || next.x >= rows || next.y < 0 || next.y >= cols {
+			return false
+		}
+
+		if grid[next.x][next.y] == '#' {
+			direction = (direction + 1) % 4
+		} else {
+			current = next
+
+			if visitStep, ok := visited[current]; ok && step-visitStep > 4 {
+				return true
+			}
+
+			visited[current] = step
+		}
+	}
+}

2024/gareth/day06/day06_test.go

@@ -0,0 +1,35 @@
+package day06
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`....#.....
+.........#
+..........
+..#.......
+.......#..
+..........
+.#..^.....
+........#.
+#.........
+......#...`)
+	assert.Equal(t, 41, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`....#.....
+.........#
+..........
+..#.......
+.......#..
+..........
+.#..^.....
+........#.
+#.........
+......#...`)
+	assert.Equal(t, 6, r)
+}

2024/gareth/day06/input.txt

@@ -0,0 +1,130 @@
+#.............#.#...........................................................#..........#...........................#..........#...
+............#......................#.......#..#.........#...................##....................................................
+..............#...........#..#.......#.........#.#...........................#................................#......#............
+.....#......................................#......#..#...................#....................#......................#...........
+...#............................#................................#................................................................
+..........#..................#.....#......................................................#.......................................
+..#........#.......#.#...............................................................#......#.................................#...
+.#....#................#................#.....#...................#...............................................#..#............
+.......................................................................................#...#.#....#........##......#........#.#.##
+............................................#.................#.....................#..........................#..................
+....#..........##......................#.................................................................................#........
+......#.............##.........#.......#.........#.......#.............#...#.......#..............................................
+.#............................................................................#..........#....#...................................
+...#..#....#..............................#...........................................................................#...........
+.............#....................................................................................................................
+................................#..................##...................................#...............................#......#..
+..........#.........#.................#..........###...........................................#............#...#.................
+.............#....................................#.......#.#.#............#............................................#.........
+......#.#..............................................................................................#.........................#
+...#...#.........#.........#..#......#................##.................#........................................................
+.................................#......................#........#................#........................#......................
+.......................##..............#................#................#..............................#.........................
+.......#...#.....#.....##........................#..................##.....#......................................................
+.............................................#...........................#..........................................#.....#.......
+.........................#...............#....#..............#.......#...............#.#.................#.................#......
+...........................................................#....#..................................#..............................
+..........................#.................................................#............................##....#..................
+.................#...#.........................................................#........................#.....#..#................
+.........................#....#................................................#...#.....................#....#...........#.......
+................................................##.......#.#....................................#.......##........................
+..........##...#.......................#....#..#....................#........................#....................................
+#......#.......................#............#.....................................................................#...............
+.......#.......#...#..#..........#.......................................#.............#......#...................................
+...............#............#..................#.................................................................................#
+.......#...........#.......................##.....#.........#...........#...................#......#.........#.............##....#
+...................#.........................#......#..........................................#..........#.........#......#......
+.....#............#..............#...#......#....................#.............#..................................................
+................................................#........#.....#...................#.....................................#.....#..
+......................#.#...##......................##...............................................#.................#..........
+#...................#.........................#...........#.....#................#.....................#...................#......
+....#................#.....#.............#.....................................#....#...#.................................#.......
+.........#.....................................................................................................#.#.......#........
+.........#..........##..............................#............................#.#.............................#................
+#....#.#..............................................##...#...#...............#.............#....................................
+........#..#.#...................#.......................................................................#.............#..#.#...#.
+.................................................................................................................#.......#........
+............................................#..#...............##........#..........#.......................................#....#
+........#...........................#............................#.....#........................#..........#...#..........#.......
+.#...........#...................................................#...........................................#................#.#.
+............#...............................#........#...........#..........#...........#.#..............#........................
+...............................................................................##.#................#..............................
+.#.......................#.#...........#..................................#.......................................................
+..#..............................................##................#.......#....#..............#.....................#...#........
+...................#.....#................................................#..........#.........#.........#.....................#..
+........#................#................................................................................#......#................
+...................#...#....#.........................#.........................#....................#..........................#.
+.................#.......................................................#................................................#.......
+..#...........................##.#.............#..#............................................#.......................#.#........
+..#......#.........................................................................#.......................#......................
+...........................................................................................................#............#......#..
+............................................................^..........................................#..........#...............
+..#.........#....................#..........................................#........#.........................................#..
+........#...............#....#.............#......#.........................................................................#.....
+.........#......#.....#..............#...........................................................#..............#.................
+.........#...................................................#...###...........#.......#.##.......................................
+.....................##.................#.........##.....................#................#................#.........#............
+.......................................................................#..............#..............#.................#..........
+.##.........#..........................................................................#....................................#.....
+.........................#.............................#........................................................................#.
+........#.............................................#......#....#.....................................#....................#....
+........#...#..............................................................................#.........#............................
+..............................#................................#..........#..............#..................................#.....
+........##..#...................................#................................#.................#.........#......#..#........#.
+..................#......#...................................................................#....................................
+..........#.............#..............#........#............#...............#..#..........#..............#.#...#............#....
+............................##....#..............#......................................................................#.........
+...............................................#.....#...........#.....##...............#..#......................................
+.........................#.......#...............................#...........#.........#...........#....#.........................
+.#............#...#...............#..............................................................#..........................#....#
+#...........#......................................................#.............................#......#.........................
+..................................................#....#...............#.........................#................................
+................................................#..........................#.......#..............................#....##.......#.
+........#......#..#............#................#............................#......#.##.........#....................#..#........
+.......................................................#..#.#....................#..#......................................#......
+.....................#.......................................................................#............#.......................
+.....................##........................#...................#.....................#........................................
+..........................#...........................................................................................#...........
+..#..........#...................#..............##..#.....................#...................#..............#...........#........
+#................................#....##......#.............#..............#.......................#.........#...........#........
+..................#................#...............................#.....#..........#................#..............#.............
+................#.#.........#.....##...............................................................#..............#...............
+..#...............................................................................................#...............................
+..........#.................#...........#.......#.........................#...#.......#...........................................
+..##....#......................................#.#.......................................#.................#......................
+.......................#..#...#.##......................................................................#.........#...#...........
+...............#.........#..............#.....................................................#...................#...............
+......#.................#............#......#...................#..#.........................#........................#........#..
+......................................................................#...........................#........#......................
+..........#..........#........................#.............##....................................................................
+....#................................................#.......................#................#...............#...................
+.................#....................................................#......#....................................................
+.#........#.......................................................................................................................
+......##..................#....#......#.................#....................#.....................#..#...........#...............
+#...#...#...#..............#........#.......................#.#..........#...............................#......#.................
+#...#...................#.............#........#..........#...............................................................#...#...
+..#................................#...#.........................#...................#......#.....................................
+...#...###..........#............#...............................................................#..........#.....................
+............#..............#.......#.....#..........#.....#.........................................................#............#
+..#......................#..#...#................................#......#.......#.....#..................#.........#..............
+....##......#.......................................................#..............................................#..............
+...............................#.....#....#.................................................#.......#............#................
+..........#....#......................#........#..........................#......#................................................
+......#.............................#...........#..................#...........................#................................#.
+...........................##..........................................#.....#.#.....................#................#...........
+..#..............#.........................................................#........................#.........#.................#.
+#.....#.....#......................#....................#........................................#...........#...........#......#.
+.......................................#..#................................#.........#.......#..#.....#..........................#
+..........#..............##...............#..........................................................#......#......#......#....#..
+.............#..............#..#......#........#..#......##.......................#...........#.......#...........................
+......................#.......................................#.......#..#.....................................#.........#...##...
+...........................#...........................#......#....#.............................#.............................#..
+..................#............................#....#........##.........................#..............#.............#............
+.......#....................#.....#........#.......#.#...#...............#.....#.#.........................#.......#.#............
+.....#.........#.......#..........#.................#..#...#..................................................##..................
+................#........................................................#........................................................
+....##......#........#..................#.........................#...................................#...#...................#...
+..............#....................#.......#.......................#.............#......#..............#..........................
+...........................#..............#.....#............#.....................#........#....#.......................#........
+........#..##................#.....#.#..............#..............................#........................#.........#...........
+.........................................................#...........................##..........#........#.##....................

2024/gareth/day07/day07.go

@@ -0,0 +1,90 @@
+package day07
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func Part1(input string) int {
+	total := 0
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+
+	for i := 0; i < len(lines); i++ {
+		target, numbers := parseLine(lines[i])
+		if validLinePart1(numbers, 1, numbers[0], target) {
+			total += target
+		}
+	}
+
+	return total
+}
+
+func Part2(input string) int {
+	total := 0
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+
+	for i := 0; i < len(lines); i++ {
+		target, numbers := parseLine(lines[i])
+		if validLinePart2(numbers, 1, numbers[0], target) {
+			total += target
+		}
+	}
+
+	return total
+}
+
+func parseLine(line string) (int, []int) {
+	parts := strings.Split(line, ":")
+	target, _ := strconv.Atoi(strings.TrimSpace(parts[0]))
+	numberStrings := strings.Fields(parts[1])
+
+	numbers := make([]int, len(numberStrings))
+	for i := 0; i < len(numberStrings); i++ {
+		numbers[i], _ = strconv.Atoi(strings.TrimSpace(numberStrings[i]))
+	}
+
+	return target, numbers
+}
+
+func validLinePart1(numbers []int, index int, currentValue int, target int) bool {
+	if index == len(numbers) {
+		return currentValue == target
+	}
+
+	sum := currentValue + numbers[index]
+	if validLinePart1(numbers, index+1, sum, target) {
+		return true
+	}
+
+	product := currentValue * numbers[index]
+	if validLinePart1(numbers, index+1, product, target) {
+		return true
+	}
+
+	return false
+}
+
+func validLinePart2(numbers []int, index int, currentValue int, target int) bool {
+	if index == len(numbers) {
+		return currentValue == target
+	}
+
+	sum := currentValue + numbers[index]
+	if validLinePart2(numbers, index+1, sum, target) {
+		return true
+	}
+
+	product := currentValue * numbers[index]
+	if validLinePart2(numbers, index+1, product, target) {
+		return true
+	}
+
+	// Turns 12 || 34 into 1234
+	concatenated, _ := strconv.Atoi(strings.TrimSpace(fmt.Sprintf("%d%d", currentValue, numbers[index])))
+	if validLinePart2(numbers, index+1, concatenated, target) {
+		return true
+	}
+
+	return false
+}

2024/gareth/day07/day07_test.go

@@ -0,0 +1,33 @@
+package day07
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20`)
+	assert.Equal(t, 3749, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20`)
+	assert.Equal(t, 11387, r)
+}

2024/gareth/day07/input.txt

@@ -0,0 +1,850 @@
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2024/gareth/day08/day08.go

@@ -0,0 +1,80 @@
+package day08
+
+import (
+	"math"
+	"strings"
+)
+
+type Coordinate struct {
+	Row int
+	Col int
+}
+
+func Part1(input string) int {
+	grid, antennaMap := parseInput(input)
+	result := findAntinodes(grid, antennaMap, true)
+	return result
+}
+
+func Part2(input string) int {
+	grid, antennaMap := parseInput(input)
+	result := findAntinodes(grid, antennaMap, false)
+	return result
+}
+
+func parseInput(input string) ([][]rune, map[rune][]Coordinate) {
+	lines := strings.Split(input, "\n")
+	rowCount := len(lines)
+	colCount := len(lines[0])
+	grid := make([][]rune, rowCount)
+	antennaMap := make(map[rune][]Coordinate)
+
+	for row := 0; row < rowCount; row++ {
+		grid[row] = []rune(lines[row])
+		for col := 0; col < colCount; col++ {
+			frequency := grid[row][col]
+			if frequency != '.' {
+				antennaMap[frequency] = append(antennaMap[frequency], Coordinate{Row: row, Col: col})
+			}
+		}
+	}
+
+	return grid, antennaMap
+}
+
+func findAntinodes(grid [][]rune, antennaMap map[rune][]Coordinate, onlySpecial bool) int {
+	rowCount := len(grid)
+	colCount := len(grid[0])
+	uniqueAntinodes := make(map[Coordinate]struct{})
+
+	for row := 0; row < rowCount; row++ {
+		for col := 0; col < colCount; col++ {
+			for _, antennaPositions := range antennaMap {
+				for i, firstAntenna := range antennaPositions {
+					for j, secondAntenna := range antennaPositions {
+						//I know I know thats too many for loops
+						if i != j {
+							distance1 := int(math.Abs(float64(row-firstAntenna.Row)) + math.Abs(float64(col-firstAntenna.Col)))
+							distance2 := int(math.Abs(float64(row-secondAntenna.Row)) + math.Abs(float64(col-secondAntenna.Col)))
+
+							rowDiff1 := row - firstAntenna.Row
+							rowDiff2 := row - secondAntenna.Row
+							colDiff1 := col - firstAntenna.Col
+							colDiff2 := col - secondAntenna.Col
+
+							if rowDiff1*colDiff2 == rowDiff2*colDiff1 {
+								if (distance1 == 2*distance2 || distance1*2 == distance2) && onlySpecial {
+									uniqueAntinodes[Coordinate{Row: row, Col: col}] = struct{}{}
+								} else if !onlySpecial {
+									uniqueAntinodes[Coordinate{Row: row, Col: col}] = struct{}{}
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	return len(uniqueAntinodes)
+}

2024/gareth/day08/day08_test.go

@@ -0,0 +1,39 @@
+package day08
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`............
+........0...
+.....0......
+.......0....
+....0.......
+......A.....
+............
+............
+........A...
+.........A..
+............
+............`)
+	assert.Equal(t, 14, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`............
+........0...
+.....0......
+.......0....
+....0.......
+......A.....
+............
+............
+........A...
+.........A..
+............
+............`)
+	assert.Equal(t, 11387, r)
+}

2024/gareth/day08/input.txt

@@ -0,0 +1,50 @@
+........................E...j......W..........L...
+............................O........E.........L..
+..q......O...........l....................K.......
+............q...................HM......W.........
+................................1..H...........IW.
+....................5.............................
+..........k........M...wl............6............
+.....O.......w...k.....5.8..l......K.........o.6..
+.......k....w.........5.........R.....o........K..
+.....q..X..............j........E...I.........K...
+............O..........E........................H.
+................Mn.h2.w.p....................H....
+..................p.......a............j.....L....
+.....X...l.p.....................m.........W..6...
+..Xq................A..................R..m.......
+.........................i..........a..........R..
+...........u.....................a........I.....2.
+k..............A..n.........R.................o...
+................n.................Qo..............
+..........u.A.........h........2..................
+...5.......Y.....p...............iN...............
+1...x.....................i.......................
+........M..............2.....Qi...................
+...............................I..e...............
+......u......A...........m..........h.............
+.......1...........U.............Qm.......j.......
+.......X.......................................9..
+.....u........U.......Y...........................
+.............................h.e..................
+..................4....e......Q.....L....N........
+.1..................4.......................y8....
+.........Y................................8.N.....
+............P.0J...........3..........8y..........
+....V3P..........J................................
+............U..P...7x...........e.................
+....................J...............r...9.........
+.........0.V......Y...............................
+...............V.4................................
+..........V..........................n............
+..............v........7..........................
+...........U..........J.......7...................
+.....v........7..........................a........
+.......................................r..........
+...........0.......x................y.............
+............6..v.x.....................N..........
+...........P......................................
+........3.......................r......4..........
+..............3......................y............
+................................................9.
+.................................................9

2024/gareth/day09/day09.go

@@ -0,0 +1,104 @@
+package day09
+
+func Part1(input string) int {
+	files, gaps, lengthOfFinalFile := parseInput(input)
+	checksum := compactFiles(files, gaps, lengthOfFinalFile)
+	return checksum
+}
+
+func Part2(input string) int {
+	files, freeSpaces := parseInputPart2(input)
+	checksum := calculateChecksum(files, freeSpaces)
+	return checksum
+}
+
+func parseInput(input string) ([]int, []int, int) {
+	var files []int
+	var gaps []int
+	lengthOfFinalFile := 0
+	for i, char := range input {
+		if i%2 == 0 {
+			files = append(files, int(char-'0'))
+			lengthOfFinalFile += int(char - '0')
+		} else {
+			gaps = append(gaps, int(char-'0'))
+		}
+	}
+	return files, gaps, lengthOfFinalFile
+}
+
+func parseInputPart2(input string) ([][]int, [][]int) {
+	files, freeSpaces, position := [][]int{}, [][]int{}, 0
+	for index, char := range input {
+		length := int(char - '0')
+		if index%2 == 0 {
+			files = append(files, generateRange(position, position+length))
+		} else {
+			freeSpaces = append(freeSpaces, generateRange(position, position+length))
+		}
+		position += length
+	}
+	return files, freeSpaces
+}
+
+func compactFiles(files []int, gaps []int, lengthOfFinalFile int) int {
+	fileIndex := len(files) - 1
+	gapIndex := 0
+	position := files[0]
+	checksum := 0
+	fileID := files[0]
+
+	for lengthOfFinalFile != position {
+		// If there's a gap and a file to move then move the file
+		if gaps[gapIndex] > 0 && files[fileIndex] > 0 {
+			files[fileIndex]--
+			gaps[gapIndex]--
+			checksum += fileIndex * position
+			position++
+		}
+
+		// If this file is fully moved go to next file
+		if files[fileIndex] == 0 {
+			fileIndex--
+			fileID++
+		}
+
+		// Update gapIndex if this gap is filled
+		if gaps[gapIndex] == 0 {
+			gapIndex++
+			for f := 0; f < files[gapIndex]; f++ {
+				checksum += gapIndex * position
+				position++
+			}
+		}
+	}
+
+	return checksum
+}
+
+func generateRange(start, end int) []int {
+	rangeList := make([]int, end-start)
+	for i := range rangeList {
+		rangeList[i] = start + i
+	}
+	return rangeList
+}
+
+func calculateChecksum(files, freeSpaces [][]int) int {
+	checksum := 0
+	for fileIndex := len(files) - 1; fileIndex >= 0; fileIndex-- {
+		for spaceIndex := 0; spaceIndex < len(freeSpaces); spaceIndex++ {
+			if len(freeSpaces[spaceIndex]) >= len(files[fileIndex]) && files[fileIndex][0] > freeSpaces[spaceIndex][0] {
+				files[fileIndex] = freeSpaces[spaceIndex][:len(files[fileIndex])]
+				freeSpaces[spaceIndex] = freeSpaces[spaceIndex][len(files[fileIndex]):]
+			}
+		}
+	}
+
+	for fileID, file := range files {
+		for _, block := range file {
+			checksum += fileID * block
+		}
+	}
+	return checksum
+}

2024/gareth/day09/day09_test.go

@@ -0,0 +1,22 @@
+package day09
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`12345`)
+	assert.Equal(t, 60, r)
+}
+
+func TestPart1Long(t *testing.T) {
+	r := Part1(`2333133121414131402`)
+	assert.Equal(t, 1928, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`2333133121414131402`)
+	assert.Equal(t, 2858, r)
+}

2024/gareth/day10/day10.go

@@ -0,0 +1,141 @@
+package day10
+
+import (
+	"strings"
+)
+
+var directions = [][2]int{
+	{-1, 0},
+	{1, 0},
+	{0, -1},
+	{0, 1},
+}
+
+func Part1(input string) int {
+	grid := ParseInput(input)
+	return CalculateTotalTrailheadScore(grid)
+}
+
+func Part2(input string) int {
+	grid := ParseInput(input)
+	return CalculateTotalTrailheadRating(grid)
+}
+
+func ParseInput(input string) [][]int {
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+	grid := make([][]int, len(lines))
+	for i, line := range lines {
+		grid[i] = make([]int, len(line))
+		for j, char := range line {
+			grid[i][j] = int(char - '0')
+		}
+	}
+	return grid
+}
+
+func IsValidPosition(x, y, rows, cols int) bool {
+	return x >= 0 && x < rows && y >= 0 && y < cols
+}
+
+func DFS(grid [][]int, x, y, prevHeight int, visited [][]bool, reached9 map[[2]int]bool) {
+	rows := len(grid)
+	cols := len(grid[0])
+	if !IsValidPosition(x, y, rows, cols) || visited[x][y] || grid[x][y] != prevHeight+1 {
+		return
+	}
+
+	if grid[x][y] == 9 {
+		reached9[[2]int{x, y}] = true
+		return
+	}
+
+	visited[x][y] = true
+	for _, dir := range directions {
+		nx, ny := x+dir[0], y+dir[1]
+		DFS(grid, nx, ny, grid[x][y], visited, reached9)
+	}
+	visited[x][y] = false
+}
+
+func CalculateTrailheadScore(grid [][]int, x, y int) int {
+	rows := len(grid)
+	cols := len(grid[0])
+	visited := make([][]bool, rows)
+	for i := range visited {
+		visited[i] = make([]bool, cols)
+	}
+
+	reached9 := make(map[[2]int]bool)
+	DFS(grid, x, y, -1, visited, reached9)
+	return len(reached9)
+}
+
+func DFSForRatings(grid [][]int, x, y, prevHeight int, visited [][]bool, trailCache map[[3]int]int) int {
+	rows := len(grid)
+	cols := len(grid[0])
+	if !IsValidPosition(x, y, rows, cols) || visited[x][y] || grid[x][y] != prevHeight+1 {
+		return 0
+	}
+
+	if grid[x][y] == 9 {
+		return 1
+	}
+
+	cacheKey := [3]int{x, y, grid[x][y]}
+	if count, exists := trailCache[cacheKey]; exists {
+		return count
+	}
+
+	visited[x][y] = true
+	totalTrails := 0
+	for _, dir := range directions {
+		nx, ny := x+dir[0], y+dir[1]
+		totalTrails += DFSForRatings(grid, nx, ny, grid[x][y], visited, trailCache)
+	}
+	visited[x][y] = false
+
+	trailCache[cacheKey] = totalTrails
+	return totalTrails
+}
+
+func CalculateTrailheadRating(grid [][]int, x, y int) int {
+	rows := len(grid)
+	cols := len(grid[0])
+	visited := make([][]bool, rows)
+	for i := range visited {
+		visited[i] = make([]bool, cols)
+	}
+
+	trailCache := make(map[[3]int]int)
+	return DFSForRatings(grid, x, y, -1, visited, trailCache)
+}
+
+func CalculateTotalTrailheadScore(grid [][]int) int {
+	rows := len(grid)
+	cols := len(grid[0])
+	totalScore := 0
+	for i := 0; i < rows; i++ {
+		for j := 0; j < cols; j++ {
+			if grid[i][j] == 0 {
+				score := CalculateTrailheadScore(grid, i, j)
+				totalScore += score
+			}
+		}
+	}
+	return totalScore
+}
+
+func CalculateTotalTrailheadRating(grid [][]int) int {
+	rows := len(grid)
+	cols := len(grid[0])
+	totalRating := 0
+	for i := 0; i < rows; i++ {
+		for j := 0; j < cols; j++ {
+			if grid[i][j] == 0 {
+				rating := CalculateTrailheadRating(grid, i, j)
+				totalRating += rating
+			}
+		}
+	}
+	return totalRating
+}

2024/gareth/day10/day10_test.go

@@ -0,0 +1,31 @@
+package day10
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`89010123
+78121874
+87430965
+96549874
+45678903
+32019012
+01329801
+10456732`)
+	assert.Equal(t, 36, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`89010123
+78121874
+87430965
+96549874
+45678903
+32019012
+01329801
+10456732`)
+	assert.Equal(t, 81, r)
+}

2024/gareth/day10/input.txt

@@ -0,0 +1,45 @@
+987123434330121232101001234730123456781067632
+876076576521010345692340349823212347892398701
+945087689432105676787659856714503210987445610
+332196576587654989801456787609654502376530923
+211543210298923215432321098128778901430121894
+300692340147210106523543210039569876589836765
+456781678236103267015693016543410231276745650
+576890549345234178106782187612320140345654321
+985098432100125089235493498109876056034765012
+834127102345456978340362569018765487123876678
+123236221976347869651251078729034398101985589
+014545340889298958707867897430120987012834432
+105965456770107843216950956541231276543124501
+896872378761016930345441019876501345678023670
+787901069654325321210332398545432330589012981
+107821543213034321089206787638901421432103210
+215430694102123475670115896129876548901210349
+126989780210014984308924925014578037654321458
+037878921001235675217833210123669123109452367
+549865438901045102346542106548754321278501476
+678954987432696201256430087239689870347699985
+230143006501787349961021298101236787656788014
+123272112981010458872787034010345691875107623
+054387623472129867763698125676210010961234510
+565694502561036789854567012980387121250129878
+676783411051045672343218763901296030343278569
+989872123432345891050109654812345145467303450
+012763094321056700891760345765432256958912341
+103450185789763211709851236876301967843211032
+814321276656854345612345654954101878701208983
+923434434565956745678036783063210989870345674
+874532345410345832989123192178981876781456564
+265101654323234901808765013265432185692387565
+103216765432101267814554323476501094501893474
+232109856321011876923601098789678923432102985
+343898707896540945498712367765672310567891078
+456789010987231234321203456894581455454986569
+556776125670102343100157654503490166303890432
+543895434894321765212348983212321876212761201
+432104898765010894301054581200110955211654300
+301256567656987105498765690341034567300563212
+434567430547896234787654785652123498456767843
+321798121032345375696543098743096567877854952
+210899021121036789781232143456787656928923761
+326765430110145678710123232109876543210010890

2024/gareth/day11/day11.go

@@ -0,0 +1,89 @@
+package day11
+
+import (
+	"strconv"
+	"strings"
+)
+
+func Part1(input string) int {
+	stones := ParseInput(input)
+	return len(blinkTimes(stones, 25))
+}
+
+func Part2(input string) int {
+	stones := ParseInput(input)
+	return getNumStones(stones, 75)
+}
+
+func ParseInput(input string) []int {
+	strStones := strings.Split(strings.TrimSpace(input), " ")
+	stones := make([]int, 0, len(strStones))
+	for _, s := range strStones {
+		num, _ := strconv.Atoi(s)
+		stones = append(stones, num)
+	}
+	return stones
+}
+
+// Part 1 initial thought of recursion
+func blinkTimes(stones []int, times int) []int {
+	if times <= 0 {
+		return stones
+	}
+	result := blink(stones)
+	return blinkTimes(result, times-1)
+}
+
+func blink(stones []int) []int {
+	result := make([]int, 0)
+	for _, stone := range stones {
+		strStone := strconv.Itoa(stone)
+		if stone == 0 {
+			result = append(result, 1)
+		} else if len(strStone)%2 == 0 {
+			mid := len(strStone) / 2
+			firstHalf, _ := strconv.Atoi(strStone[:mid])
+			secondHalf, _ := strconv.Atoi(strStone[mid:])
+			result = append(result, firstHalf, secondHalf)
+		} else {
+			result = append(result, stone*2024)
+		}
+	}
+	return result
+}
+
+// Part 2 with maps since blinkTimes(75) would set my computer on fire
+func getNumStones(s []int, times int) int {
+	stoneMap := make(map[int]int)
+	for _, stone := range s {
+		stoneMap[stone] = stoneMap[stone] + 1
+	}
+
+	for i := 0; i < times; i++ {
+		stoneMap2 := make(map[int]int)
+		for stone, count := range stoneMap {
+			stones := make([]int, 0)
+			strStone := strconv.Itoa(stone)
+			if stone == 0 {
+				stones = append(stones, 1)
+			} else if len(strStone)%2 == 0 {
+				mid := len(strStone) / 2
+				firstHalf, _ := strconv.Atoi(strStone[:mid])
+				secondHalf, _ := strconv.Atoi(strStone[mid:])
+				stones = append(stones, firstHalf, secondHalf)
+			} else {
+				stones = append(stones, stone*2024)
+			}
+			for _, newStone := range stones {
+				stoneMap2[newStone] = stoneMap2[newStone] + count
+			}
+		}
+		stoneMap = stoneMap2
+	}
+
+	result := 0
+	for _, count := range stoneMap {
+		result += count
+	}
+	return result
+}

2024/gareth/day11/day11_test.go

@@ -0,0 +1,12 @@
+package day11
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`125 17`)
+	assert.Equal(t, 55312, r)
+}

2024/gareth/day11/input.txt

@@ -0,0 +1 @@
+965842 9159 3372473 311 0 6 86213 48

2024/gareth/day13/day13.go

@@ -0,0 +1,76 @@
+package day13
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+type ClawMachine struct {
+	Ax, Ay int
+	Bx, By int
+	Px, Py int
+}
+
+func Part1(input string) int {
+	clawMachines := parseInput(input)
+	total := 0
+	for _, c := range clawMachines {
+		x, y := solveSimEquations(c.Ax, c.Bx, c.Px, c.Ay, c.By, c.Py)
+		total += x*3 + y
+	}
+	return total
+}
+
+func Part2(input string) int {
+	clawMachines := parseInput(input)
+	total := 0
+	for _, c := range clawMachines {
+		prizeX, prizeY := c.Px+10000000000000, c.Py+10000000000000
+		det, x, y := c.Ax*c.By-c.Bx*c.Ay, prizeX*c.By-c.Bx*prizeY, c.Ax*prizeY-prizeX*c.Ay
+		if det != 0 && x == (x/det)*det && y == (y/det)*det {
+			total += (x/det)*3 + (y / det)
+		}
+	}
+
+	return total
+}
+
+func parseInput(input string) []ClawMachine {
+	clawMachines := strings.Split(strings.TrimSpace(input), "\n\n")
+	output := make([]ClawMachine, 0, len(clawMachines))
+	for _, c := range clawMachines {
+		var clawMachine ClawMachine
+		line := strings.Split(strings.TrimSpace(c), "\n")
+
+		re := regexp.MustCompile(`X\+(\d+), Y\+(\d+)`)
+		matches := re.FindStringSubmatch(line[0])
+		clawMachine.Ax, _ = strconv.Atoi(matches[1])
+		clawMachine.Ay, _ = strconv.Atoi(matches[2])
+
+		matches = re.FindStringSubmatch(line[1])
+		clawMachine.Bx, _ = strconv.Atoi(matches[1])
+		clawMachine.By, _ = strconv.Atoi(matches[2])
+
+		re = regexp.MustCompile(`X=(\d+), Y=(\d+)`)
+		matches = re.FindStringSubmatch(line[2])
+		clawMachine.Px, _ = strconv.Atoi(matches[1])
+		clawMachine.Py, _ = strconv.Atoi(matches[2])
+
+		output = append(output, clawMachine)
+	}
+	return output
+}
+
+func solveSimEquations(a1, b1, c1, a2, b2, c2 int) (int, int) {
+	det := a1*b2 - a2*b1
+	if det == 0 || (c1*b2-c2*b1)%det != 0 || (a1*c2-a2*c1)%det != 0 {
+		return 0, 0
+	}
+	x := (c1*b2 - c2*b1) / det
+	y := (a1*c2 - a2*c1) / det
+	if x < 0 || x > 100 || y < 0 || y > 100 {
+		return 0, 0
+	}
+	return x, y
+}

2024/gareth/day13/day13_test.go

@@ -0,0 +1,45 @@
+package day13
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`Button A: X+94, Y+34
+Button B: X+22, Y+67
+Prize: X=8400, Y=5400
+
+Button A: X+26, Y+66
+Button B: X+67, Y+21
+Prize: X=12748, Y=12176
+
+Button A: X+17, Y+86
+Button B: X+84, Y+37
+Prize: X=7870, Y=6450
+
+Button A: X+69, Y+23
+Button B: X+27, Y+71
+Prize: X=18641, Y=10279`)
+	assert.Equal(t, 480, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`Button A: X+94, Y+34
+Button B: X+22, Y+67
+Prize: X=8400, Y=5400
+
+Button A: X+26, Y+66
+Button B: X+67, Y+21
+Prize: X=12748, Y=12176
+
+Button A: X+17, Y+86
+Button B: X+84, Y+37
+Prize: X=7870, Y=6450
+
+Button A: X+69, Y+23
+Button B: X+27, Y+71
+Prize: X=18641, Y=10279`)
+	assert.Equal(t, 0, r)
+}

2024/gareth/day14/day14.go

@@ -0,0 +1,172 @@
+package day14
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type Robot struct {
+	px, py int // position
+	vx, vy int // velocity
+}
+
+func Part1(input string) int {
+	// Parse the input
+	lines := strings.Split(input, "\n")
+	var robots []Robot
+	for _, line := range lines {
+		robot := ParseRobot(line)
+		robots = append(robots, robot)
+	}
+
+	// Define grid size
+	gridWidth := 101
+	gridHeight := 103
+
+	// Update robot positions for 100 seconds
+	for i := 0; i < 100; i++ {
+		for j := range robots {
+			robots[j].UpdatePosition(gridWidth, gridHeight)
+		}
+	}
+
+	// Count the robots in each quadrant
+	q1, q2, q3, q4 := CountRobotsInQuadrants(robots, gridWidth, gridHeight)
+	fmt.Printf("Quadrant counts: Q1=%d, Q2=%d, Q3=%d, Q4=%d\n", q1, q2, q3, q4)
+
+	// Calculate the safety factor
+	safetyFactor := CalculateSafetyFactor(q1, q2, q3, q4)
+	fmt.Printf("Safety Factor: %d\n", safetyFactor)
+	return safetyFactor
+}
+
+func Part2(input string) int {
+	// Parse the input
+	lines := strings.Split(input, "\n")
+	var robots []Robot
+	for _, line := range lines {
+		robot := ParseRobot(line)
+		robots = append(robots, robot)
+	}
+
+	// Define grid size
+	gridWidth := 101
+	gridHeight := 103
+
+	// Update robot positions for 100 seconds
+	for i := 0; i < 6285; i++ {
+		for j := range robots {
+			robots[j].UpdatePosition(gridWidth, gridHeight)
+		}
+	}
+
+	DisplayGrid(robots, gridWidth, gridHeight)
+	return 2
+}
+
+// ParseRobot takes a line of input and converts it to a Robot struct
+func ParseRobot(line string) Robot {
+	parts := strings.Split(line, " ")
+	posParts := strings.Split(parts[0][2:], ",") // Extract p=x,y and split
+	velParts := strings.Split(parts[1][2:], ",") // Extract v=x,y and split
+
+	px, _ := strconv.Atoi(posParts[0])
+	py, _ := strconv.Atoi(posParts[1])
+	vx, _ := strconv.Atoi(velParts[0])
+	vy, _ := strconv.Atoi(velParts[1])
+
+	return Robot{px, py, vx, vy}
+}
+
+// UpdatePosition updates the position of a robot, considering the wrap-around
+func (r *Robot) UpdatePosition(gridWidth, gridHeight int) {
+	r.px = (r.px + r.vx + gridWidth) % gridWidth
+	r.py = (r.py + r.vy + gridHeight) % gridHeight
+}
+
+// CountRobotsInQuadrants counts the number of robots in each of the four quadrants
+func CountRobotsInQuadrants(robots []Robot, width, height int) (int, int, int, int) {
+	midX := width / 2
+	midY := height / 2
+
+	q1, q2, q3, q4 := 0, 0, 0, 0
+
+	for _, r := range robots {
+		if r.px == midX || r.py == midY {
+			// Skip robots on the middle line
+			continue
+		}
+		if r.px < midX && r.py < midY {
+			q1++ // Top-left quadrant
+		} else if r.px > midX && r.py < midY {
+			q2++ // Top-right quadrant
+		} else if r.px < midX && r.py > midY {
+			q3++ // Bottom-left quadrant
+		} else if r.px > midX && r.py > midY {
+			q4++ // Bottom-right quadrant
+		}
+	}
+
+	return q1, q2, q3, q4
+}
+
+// CalculateSafetyFactor multiplies the number of robots in each quadrant
+func CalculateSafetyFactor(q1, q2, q3, q4 int) int {
+	return q1 * q2 * q3 * q4
+}
+
+// DisplayGrid displays the current state of the grid
+func DisplayGrid(robots []Robot, width, height int) {
+	grid := make([][]rune, height)
+	for i := range grid {
+		grid[i] = make([]rune, width)
+		for j := range grid[i] {
+			grid[i][j] = '.'
+		}
+	}
+	for _, r := range robots {
+		grid[r.py][r.px] = '#'
+	}
+	for _, row := range grid {
+		fmt.Println(string(row))
+	}
+}
+
+// FindEasterEgg determines the fewest number of seconds that must elapse for the robots to display the Easter egg
+func FindEasterEgg(robots []Robot, width, height int) int {
+	smallestArea := width * height
+	bestTime := 0
+	for t := 6285; t < 6286; t++ { // Large upper limit to search
+		// Update robot positions
+		for i := range robots {
+			robots[i].UpdatePosition(width, height)
+		}
+		// Calculate the bounding box of all robot positions
+		minX, minY := width, height
+		maxX, maxY := 0, 0
+		for _, r := range robots {
+			if r.px < minX {
+				minX = r.px
+			}
+			if r.px > maxX {
+				maxX = r.px
+			}
+			if r.py < minY {
+				minY = r.py
+			}
+			if r.py > maxY {
+				maxY = r.py
+			}
+		}
+
+		area := (maxX - minX + 1) * (maxY - minY + 1)
+		if area < smallestArea {
+			smallestArea = area
+			bestTime = t + 1
+			fmt.Printf("Time: %d\n", bestTime)
+			DisplayGrid(robots, width, height)
+		}
+	}
+	return bestTime
+}

2024/gareth/day14/day14_test.go

@@ -0,0 +1,23 @@
+package day14
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`p=0,4 v=3,-3
+p=6,3 v=-1,-3
+p=10,3 v=-1,2
+p=2,0 v=2,-1
+p=0,0 v=1,3
+p=3,0 v=-2,-2
+p=7,6 v=-1,-3
+p=3,0 v=-1,-2
+p=9,3 v=2,3
+p=7,3 v=-1,2
+p=2,4 v=2,-3
+p=9,5 v=-3,-3`)
+	assert.Equal(t, 12, r)
+}

2024/gareth/day14/input.txt

@@ -0,0 +1,500 @@
+p=38,76 v=-61,88
+p=28,22 v=-43,-40
+p=76,78 v=-98,87
+p=39,56 v=10,96
+p=38,0 v=79,-15
+p=6,44 v=-88,53
+p=40,80 v=-83,31
+p=11,2 v=28,-31
+p=41,91 v=-86,-48
+p=8,55 v=-81,95
+p=77,19 v=3,-90
+p=94,73 v=-59,42
+p=51,53 v=35,48
+p=12,52 v=72,6
+p=62,61 v=96,47
+p=78,62 v=47,-57
+p=39,54 v=53,50
+p=1,43 v=-64,-46
+p=9,21 v=28,-36
+p=92,79 v=67,-47
+p=6,15 v=-58,-48
+p=54,67 v=99,-38
+p=96,99 v=-55,30
+p=90,44 v=-10,-8
+p=23,84 v=20,77
+p=5,84 v=28,88
+p=55,20 v=-31,-36
+p=84,43 v=-37,-41
+p=12,75 v=-38,30
+p=39,2 v=-12,-29
+p=74,14 v=56,-81
+p=63,53 v=22,-53
+p=51,28 v=9,-90
+p=53,72 v=48,-61
+p=33,42 v=-43,23
+p=75,18 v=-89,-37
+p=38,83 v=27,38
+p=69,31 v=61,80
+p=73,3 v=-45,74
+p=39,29 v=92,17
+p=78,45 v=-23,-47
+p=48,59 v=-57,38
+p=2,41 v=-71,-93
+p=30,13 v=36,-82
+p=37,57 v=25,13
+p=51,73 v=56,-98
+p=76,78 v=38,91
+p=56,49 v=22,55
+p=34,47 v=10,84
+p=83,93 v=81,-16
+p=14,70 v=71,-50
+p=97,74 v=-4,70
+p=33,8 v=93,-35
+p=39,70 v=-2,19
+p=94,63 v=20,44
+p=86,4 v=-33,19
+p=17,67 v=26,44
+p=39,2 v=-70,-25
+p=47,56 v=-79,-55
+p=5,98 v=86,-75
+p=53,21 v=79,-89
+p=53,85 v=61,73
+p=46,32 v=66,54
+p=30,75 v=49,-73
+p=44,81 v=-61,-69
+p=82,66 v=-72,-6
+p=89,76 v=-13,98
+p=57,87 v=30,36
+p=12,41 v=59,-40
+p=36,56 v=10,-61
+p=60,80 v=48,39
+p=50,75 v=-44,42
+p=66,56 v=-93,-1
+p=57,96 v=83,-79
+p=98,88 v=-15,-16
+p=0,63 v=59,44
+p=90,27 v=29,-40
+p=21,60 v=-86,2
+p=85,13 v=11,61
+p=92,77 v=24,-34
+p=16,24 v=80,4
+p=47,8 v=-79,-49
+p=1,28 v=-82,-48
+p=80,55 v=6,-72
+p=60,94 v=-67,-15
+p=83,90 v=-98,78
+p=3,75 v=46,-66
+p=93,40 v=15,11
+p=52,37 v=48,7
+p=23,4 v=-47,25
+p=46,43 v=57,-98
+p=23,12 v=-98,-36
+p=11,42 v=-83,50
+p=80,33 v=25,54
+p=59,95 v=-1,36
+p=55,67 v=-44,-60
+p=90,80 v=83,-39
+p=57,61 v=-1,96
+p=51,79 v=31,39
+p=28,89 v=85,35
+p=12,98 v=28,-80
+p=25,61 v=-95,-50
+p=77,84 v=-37,78
+p=50,80 v=66,89
+p=93,32 v=-15,-45
+p=30,4 v=-96,-29
+p=81,95 v=14,-66
+p=23,3 v=42,-16
+p=33,69 v=-96,-10
+p=28,23 v=-43,68
+p=77,25 v=-45,-41
+p=27,96 v=-69,-32
+p=41,15 v=-53,-35
+p=66,81 v=-22,5
+p=5,15 v=13,-95
+p=88,1 v=-59,-26
+p=48,41 v=16,-19
+p=88,75 v=33,46
+p=21,9 v=-64,-86
+p=36,4 v=-16,-95
+p=68,22 v=-5,65
+p=8,43 v=-34,46
+p=71,68 v=-49,-59
+p=37,92 v=-48,-18
+p=59,43 v=-21,-10
+p=69,31 v=30,58
+p=90,77 v=46,-74
+p=42,42 v=-76,20
+p=58,34 v=78,55
+p=18,10 v=33,2
+p=23,92 v=45,-69
+p=23,45 v=-32,27
+p=63,50 v=39,-96
+p=8,72 v=-34,85
+p=22,102 v=-69,26
+p=73,14 v=-45,-38
+p=65,54 v=-51,68
+p=99,29 v=-16,67
+p=29,60 v=15,-19
+p=85,76 v=-54,80
+p=21,23 v=-3,-47
+p=9,37 v=94,-44
+p=99,77 v=48,80
+p=48,47 v=18,56
+p=26,61 v=36,-57
+p=80,58 v=56,90
+p=37,6 v=53,-90
+p=47,15 v=53,60
+p=4,79 v=70,52
+p=35,8 v=31,12
+p=18,8 v=25,-30
+p=80,38 v=33,45
+p=23,26 v=-69,61
+p=10,35 v=-78,-96
+p=53,17 v=48,-34
+p=24,45 v=72,-2
+p=65,75 v=-1,-38
+p=5,72 v=-49,39
+p=63,87 v=-27,-16
+p=0,46 v=-34,73
+p=14,46 v=55,-15
+p=28,70 v=45,92
+p=29,30 v=89,10
+p=98,31 v=-46,-89
+p=1,85 v=-77,82
+p=30,79 v=-43,28
+p=29,70 v=-81,65
+p=51,97 v=13,-25
+p=76,19 v=-23,18
+p=36,83 v=-17,91
+p=52,34 v=-39,-98
+p=35,46 v=-43,55
+p=97,13 v=-99,-26
+p=40,26 v=27,13
+p=18,38 v=89,57
+p=45,57 v=-79,-52
+p=86,76 v=-54,-64
+p=12,38 v=28,55
+p=6,56 v=-86,97
+p=85,100 v=-41,-22
+p=4,34 v=28,-95
+p=89,33 v=-4,-73
+p=82,20 v=-33,-15
+p=98,5 v=31,43
+p=85,81 v=73,88
+p=13,42 v=-90,-49
+p=93,60 v=-91,-64
+p=56,7 v=-5,64
+p=9,5 v=45,76
+p=61,4 v=74,86
+p=23,53 v=-7,3
+p=89,21 v=-38,-74
+p=13,44 v=-86,10
+p=96,62 v=-11,96
+p=5,98 v=-22,3
+p=26,26 v=-73,-93
+p=52,95 v=-5,42
+p=62,50 v=-57,-7
+p=11,2 v=41,-77
+p=23,73 v=-2,-97
+p=34,77 v=-47,-71
+p=91,58 v=99,43
+p=41,74 v=-53,42
+p=75,102 v=55,-81
+p=89,95 v=30,8
+p=76,28 v=-80,12
+p=82,27 v=-43,77
+p=62,63 v=-97,21
+p=94,73 v=-58,14
+p=13,35 v=-47,-46
+p=56,0 v=61,25
+p=94,39 v=11,8
+p=96,53 v=77,-53
+p=23,78 v=-43,-7
+p=24,51 v=-74,-86
+p=77,33 v=60,8
+p=84,71 v=-76,19
+p=78,96 v=82,3
+p=61,92 v=-58,-30
+p=9,75 v=94,-34
+p=89,13 v=7,-26
+p=16,67 v=-25,96
+p=95,43 v=-25,-54
+p=39,62 v=18,-40
+p=41,36 v=17,-65
+p=2,42 v=86,-10
+p=29,54 v=55,-2
+p=51,74 v=-44,92
+p=75,40 v=-36,-96
+p=60,15 v=-93,-84
+p=44,33 v=44,8
+p=88,51 v=85,-94
+p=26,60 v=43,62
+p=94,22 v=-81,-98
+p=4,50 v=-94,-96
+p=87,47 v=-55,3
+p=15,80 v=33,-14
+p=4,48 v=-24,-48
+p=57,36 v=-18,-98
+p=87,12 v=76,63
+p=53,17 v=-91,-81
+p=17,96 v=53,6
+p=91,40 v=95,-46
+p=23,28 v=-55,55
+p=81,7 v=-54,16
+p=62,102 v=-97,-77
+p=42,31 v=80,-41
+p=99,53 v=-72,57
+p=17,29 v=98,58
+p=24,57 v=84,-48
+p=98,101 v=-33,-30
+p=77,82 v=-36,-25
+p=44,8 v=83,18
+p=27,35 v=-27,16
+p=95,58 v=-29,52
+p=87,40 v=60,-91
+p=66,1 v=17,24
+p=17,11 v=63,21
+p=67,77 v=-23,-11
+p=91,30 v=-59,64
+p=22,34 v=7,84
+p=55,90 v=48,29
+p=45,45 v=31,50
+p=12,34 v=65,-86
+p=40,48 v=18,-1
+p=39,42 v=75,11
+p=28,27 v=63,-49
+p=93,44 v=-81,3
+p=8,78 v=-51,-15
+p=6,37 v=-51,-42
+p=73,89 v=-45,23
+p=2,80 v=-23,50
+p=93,37 v=55,-44
+p=16,52 v=-54,35
+p=15,17 v=-33,74
+p=84,37 v=-6,-48
+p=13,47 v=50,-48
+p=88,34 v=-79,-39
+p=16,68 v=50,94
+p=20,78 v=-99,29
+p=100,20 v=77,64
+p=79,2 v=-91,30
+p=52,0 v=-95,-86
+p=4,84 v=79,35
+p=13,74 v=19,-66
+p=57,55 v=-9,-63
+p=21,30 v=19,-94
+p=50,37 v=-66,4
+p=9,56 v=94,95
+p=91,59 v=55,-65
+p=77,15 v=34,-33
+p=5,100 v=81,-26
+p=26,96 v=-34,83
+p=36,64 v=-44,94
+p=37,65 v=-70,51
+p=74,6 v=25,-93
+p=33,78 v=-17,-48
+p=0,33 v=-6,-39
+p=3,55 v=-11,96
+p=32,19 v=-8,-33
+p=60,53 v=-5,-55
+p=75,62 v=56,45
+p=74,71 v=12,-66
+p=50,74 v=-53,91
+p=24,90 v=-19,-57
+p=58,53 v=31,5
+p=13,95 v=-33,20
+p=30,98 v=41,-70
+p=54,78 v=71,-43
+p=78,73 v=26,53
+p=66,30 v=-49,60
+p=81,87 v=-24,-15
+p=28,27 v=-31,11
+p=75,18 v=-89,10
+p=76,82 v=-89,-66
+p=44,65 v=-17,98
+p=17,42 v=-7,-5
+p=75,92 v=-54,32
+p=95,10 v=-28,-76
+p=20,36 v=-22,-62
+p=100,0 v=11,21
+p=37,39 v=5,-46
+p=80,50 v=-63,7
+p=77,28 v=-98,2
+p=61,41 v=-1,-40
+p=88,78 v=95,-17
+p=83,1 v=47,-30
+p=47,67 v=-30,-9
+p=14,81 v=-38,82
+p=40,97 v=-31,76
+p=76,27 v=37,-70
+p=25,73 v=80,35
+p=88,84 v=-33,77
+p=60,71 v=83,35
+p=14,93 v=-3,-25
+p=40,45 v=-35,4
+p=34,35 v=15,19
+p=87,100 v=90,-66
+p=20,90 v=-42,-68
+p=90,44 v=50,-52
+p=43,77 v=31,89
+p=99,81 v=33,-12
+p=28,35 v=58,-37
+p=37,52 v=57,6
+p=48,65 v=-66,23
+p=63,21 v=39,-35
+p=91,77 v=-15,-70
+p=27,28 v=93,-94
+p=18,61 v=-99,38
+p=56,36 v=-98,81
+p=90,75 v=-72,-67
+p=86,21 v=-13,-46
+p=20,88 v=89,-74
+p=17,41 v=-82,-98
+p=28,65 v=45,-72
+p=85,15 v=35,41
+p=39,43 v=-2,-36
+p=93,72 v=-94,91
+p=90,73 v=-64,77
+p=83,43 v=-94,-99
+p=50,59 v=-49,51
+p=58,25 v=13,-36
+p=25,102 v=-44,-54
+p=100,86 v=16,-23
+p=45,42 v=21,-90
+p=9,29 v=-13,18
+p=24,41 v=1,-47
+p=69,33 v=-58,55
+p=80,52 v=52,-2
+p=82,77 v=82,-11
+p=86,78 v=-41,-69
+p=89,58 v=69,-13
+p=12,91 v=-55,-65
+p=69,40 v=-93,59
+p=8,26 v=2,19
+p=21,47 v=19,3
+p=38,20 v=25,-83
+p=20,99 v=54,31
+p=20,74 v=-14,-30
+p=51,83 v=-40,24
+p=61,30 v=-27,-94
+p=84,19 v=-28,69
+p=28,33 v=-65,3
+p=58,91 v=-93,-18
+p=33,78 v=22,92
+p=86,53 v=63,-43
+p=53,79 v=-26,-42
+p=83,16 v=94,56
+p=21,0 v=-64,-35
+p=48,80 v=-97,79
+p=62,18 v=29,71
+p=17,13 v=-69,-36
+p=1,93 v=19,75
+p=7,75 v=41,93
+p=65,61 v=-45,65
+p=56,71 v=92,-63
+p=71,102 v=-53,-21
+p=64,79 v=96,49
+p=40,13 v=-74,-84
+p=28,71 v=93,91
+p=43,68 v=-39,-6
+p=10,40 v=63,55
+p=73,0 v=-97,-82
+p=26,38 v=85,-27
+p=27,94 v=36,-79
+p=1,99 v=-82,-30
+p=66,96 v=-23,31
+p=78,21 v=96,16
+p=10,93 v=-51,-76
+p=76,87 v=78,80
+p=13,20 v=-38,68
+p=31,42 v=-43,5
+p=56,10 v=-53,-33
+p=76,61 v=34,-4
+p=73,2 v=-36,74
+p=93,83 v=15,-19
+p=76,50 v=20,-51
+p=27,53 v=36,-51
+p=93,97 v=50,72
+p=59,22 v=87,21
+p=95,22 v=-29,66
+p=56,35 v=79,10
+p=60,38 v=17,-94
+p=67,41 v=-5,6
+p=97,71 v=-73,35
+p=26,10 v=-73,74
+p=74,71 v=5,64
+p=36,91 v=84,-17
+p=38,91 v=67,33
+p=19,64 v=41,-9
+p=89,15 v=-59,66
+p=5,94 v=94,-27
+p=92,21 v=7,-87
+p=87,64 v=-28,-5
+p=22,6 v=-95,25
+p=59,42 v=-51,-7
+p=50,95 v=88,29
+p=59,91 v=73,-21
+p=52,42 v=-75,56
+p=10,39 v=-30,7
+p=88,79 v=29,-62
+p=31,89 v=-21,-82
+p=43,60 v=4,52
+p=2,76 v=-68,-15
+p=13,71 v=-38,97
+p=93,38 v=1,-95
+p=53,99 v=10,16
+p=94,72 v=-98,30
+p=1,3 v=37,-82
+p=68,78 v=55,18
+p=1,78 v=42,-7
+p=80,84 v=52,-26
+p=75,46 v=-87,-20
+p=71,27 v=95,-39
+p=90,18 v=73,11
+p=99,3 v=62,52
+p=39,88 v=-80,-93
+p=85,32 v=69,-40
+p=72,23 v=-28,-75
+p=22,59 v=98,-7
+p=69,76 v=12,93
+p=56,59 v=30,50
+p=80,92 v=-49,-80
+p=4,40 v=-77,-50
+p=90,60 v=40,-28
+p=6,79 v=9,56
+p=63,47 v=57,-59
+p=33,62 v=22,37
+p=74,27 v=78,70
+p=26,101 v=-43,-49
+p=1,24 v=-29,-38
+p=73,90 v=56,79
+p=5,90 v=-20,-75
+p=16,35 v=94,8
+p=96,93 v=4,58
+p=61,43 v=4,4
+p=13,68 v=76,94
+p=5,29 v=86,-95
+p=32,81 v=39,-85
+p=94,42 v=-37,55
+p=80,20 v=60,22
+p=43,94 v=57,-19
+p=93,4 v=51,-26
+p=12,4 v=62,-58
+p=87,74 v=-98,-64
+p=81,41 v=-26,69
+p=30,54 v=-30,-13
+p=73,4 v=21,-30
+p=68,35 v=-49,-44
+p=47,2 v=19,-70
+p=92,100 v=33,79
+p=81,11 v=73,-83
+p=46,75 v=-62,-69
+p=48,56 v=-13,-56
+p=7,84 v=15,30
+p=92,10 v=28,69
+p=15,31 v=-87,61
+p=95,0 v=33,79
+p=3,61 v=-37,-50
+p=73,95 v=96,20

2024/gareth/day18/day18.go

@@ -0,0 +1,156 @@
+package day18
+
+import (
+	"container/heap"
+	"strconv"
+	"strings"
+)
+
+type Point struct {
+	x, y int
+}
+
+// Item represents a node in the priority queue.
+type Item struct {
+	point    Point
+	distance int
+	index    int
+}
+
+func Part1(input string) int {
+	grid := parseInput(input, 1024)
+	_, distance := dijkstra(grid)
+	return distance
+}
+
+func Part2(input string) int {
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+	numLines := len(lines)
+	for i := 1; i <= numLines; i++ {
+		grid := parseInput(input, i)
+		_, distance := dijkstra(grid)
+		if distance == -1 {
+			println(lines[i-1])
+			return 2
+		}
+	}
+	return -1
+}
+
+func parseInput(input string, upToLine int) [][]rune {
+	grid := make([][]rune, 71)
+	for i := range grid {
+		grid[i] = make([]rune, 71)
+		for j := range grid[i] {
+			grid[i][j] = '.'
+		}
+	}
+
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+
+	for index, line := range lines {
+		if index == upToLine {
+			break
+		}
+		cords := strings.Split(strings.TrimSpace(line), ",")
+		x, _ := strconv.Atoi(cords[0])
+		y, _ := strconv.Atoi(cords[1])
+		grid[x][y] = '#'
+	}
+	return grid
+}
+
+// PriorityQueue implements a priority queue for Dijkstra's algorithm.
+type PriorityQueue []*Item
+
+func (pq PriorityQueue) Len() int { return len(pq) }
+func (pq PriorityQueue) Less(i, j int) bool {
+	return pq[i].distance < pq[j].distance
+}
+func (pq PriorityQueue) Swap(i, j int) {
+	pq[i], pq[j] = pq[j], pq[i]
+	pq[i].index = i
+	pq[j].index = j
+}
+
+func (pq *PriorityQueue) Push(x interface{}) {
+	n := len(*pq)
+	item := x.(*Item)
+	item.index = n
+	*pq = append(*pq, item)
+}
+
+func (pq *PriorityQueue) Pop() interface{} {
+	old := *pq
+	n := len(old)
+	item := old[n-1]
+	item.index = -1
+	*pq = old[0 : n-1]
+	return item
+}
+
+func isValid(grid [][]rune, x, y int) bool {
+	return x >= 0 && x < len(grid) && y >= 0 && y < len(grid[0]) && grid[x][y] == '.'
+}
+
+func dijkstra(grid [][]rune) ([][]rune, int) {
+	directions := []Point{{0, 1}, {1, 0}, {0, -1}, {-1, 0}}
+	rows, cols := len(grid), len(grid[0])
+
+	// Validate start and end points
+	if grid[0][0] != '.' || grid[rows-1][cols-1] != '.' {
+		return grid, -1 // No path if start or end is not valid
+	}
+
+	dist := make([][]int, rows)
+	for i := range dist {
+		dist[i] = make([]int, cols)
+		for j := range dist[i] {
+			dist[i][j] = 1 << 30
+		}
+	}
+
+	pq := &PriorityQueue{}
+	heap.Init(pq)
+	heap.Push(pq, &Item{point: Point{0, 0}, distance: 0})
+	dist[0][0] = 0
+
+	path := make([][]Point, rows)
+	for i := range path {
+		path[i] = make([]Point, cols)
+	}
+
+	for pq.Len() > 0 {
+		item := heap.Pop(pq).(*Item)
+		x, y := item.point.x, item.point.y
+		if x == rows-1 && y == cols-1 {
+			break
+		}
+		for _, dir := range directions {
+			nx, ny := x+dir.x, y+dir.y
+			if isValid(grid, nx, ny) {
+				newDist := dist[x][y] + 1
+				if newDist < dist[nx][ny] {
+					dist[nx][ny] = newDist
+					heap.Push(pq, &Item{point: Point{nx, ny}, distance: newDist})
+					path[nx][ny] = Point{x, y}
+				}
+			}
+		}
+	}
+
+	// Check if no path exists
+	if dist[rows-1][cols-1] == 1<<30 {
+		return grid, -1 // No path found
+	}
+
+	// Reconstruct the path
+	x, y := rows-1, cols-1
+	for x != 0 || y != 0 {
+		grid[x][y] = 'O'
+		x, y = path[x][y].x, path[x][y].y
+	}
+	grid[0][0] = 'O'
+
+	return grid, dist[rows-1][cols-1]
+}

2024/gareth/day18/day18_test.go

@@ -0,0 +1,65 @@
+package day18
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`5,4
+4,2
+4,5
+3,0
+2,1
+6,3
+2,4
+1,5
+0,6
+3,3
+2,6
+5,1
+1,2
+5,5
+2,5
+6,5
+1,4
+0,4
+6,4
+1,1
+6,1
+1,0
+0,5
+1,6
+2,0`)
+	assert.Equal(t, 22, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`5,4
+4,2
+4,5
+3,0
+2,1
+6,3
+2,4
+1,5
+0,6
+3,3
+2,6
+5,1
+1,2
+5,5
+2,5
+6,5
+1,4
+0,4
+6,4
+1,1
+6,1
+1,0
+0,5
+1,6
+2,0`)
+	assert.Equal(t, 0, r)
+}

2024/gareth/day19/day19.go

@@ -0,0 +1,90 @@
+package day19
+
+import (
+	"strings"
+)
+
+func Part1(input string) int {
+	towelPatterns, designs := parseInput(input)
+	result := countPossibleDesigns(towelPatterns, designs)
+	return result
+}
+
+func Part2(input string) int {
+	towelPatterns, designs := parseInput(input)
+	result := totalArrangements(towelPatterns, designs)
+	return result
+}
+
+func parseInput(input string) ([]string, []string) {
+	parts := strings.SplitN(input, "\n\n", 2)
+	towels := strings.Split(strings.ReplaceAll(parts[0], " ", ""), ",")
+	patterns := strings.Split(strings.TrimSpace(parts[1]), "\n")
+	return towels, patterns
+}
+
+func countPossibleDesigns(towelPatterns []string, designs []string) int {
+	memo := make(map[string]bool)
+	count := 0
+
+	for _, design := range designs {
+		if canConstruct(design, towelPatterns, memo) {
+			count++
+		}
+	}
+
+	return count
+}
+
+func canConstruct(design string, patterns []string, memo map[string]bool) bool {
+	if design == "" {
+		return true
+	}
+	if val, found := memo[design]; found {
+		return val
+	}
+
+	for _, pattern := range patterns {
+		if strings.HasPrefix(design, pattern) {
+			remaining := design[len(pattern):]
+			if canConstruct(remaining, patterns, memo) {
+				memo[design] = true
+				return true
+			}
+		}
+	}
+
+	memo[design] = false
+	return false
+}
+
+func totalArrangements(towelPatterns []string, designs []string) int {
+	memo := make(map[string]int)
+	total := 0
+
+	for _, design := range designs {
+		total += countWays(design, towelPatterns, memo)
+	}
+
+	return total
+}
+
+func countWays(design string, patterns []string, memo map[string]int) int {
+	if design == "" {
+		return 1
+	}
+	if val, found := memo[design]; found {
+		return val
+	}
+
+	totalWays := 0
+	for _, pattern := range patterns {
+		if strings.HasPrefix(design, pattern) {
+			remaining := design[len(pattern):]
+			totalWays += countWays(remaining, patterns, memo)
+		}
+	}
+
+	memo[design] = totalWays
+	return totalWays
+}

2024/gareth/day19/day19_test.go

@@ -0,0 +1,35 @@
+package day19
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`r, wr, b, g, bwu, rb, gb, br
+
+brwrr
+bggr
+gbbr
+rrbgbr
+ubwu
+bwurrg
+brgr
+bbrgwb`)
+	assert.Equal(t, 6, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`r, wr, b, g, bwu, rb, gb, br
+
+brwrr
+bggr
+gbbr
+rrbgbr
+ubwu
+bwurrg
+brgr
+bbrgwb`)
+	assert.Equal(t, 16, r)
+}

2024/gareth/day19/input.txt

@@ -0,0 +1,402 @@
+rrgbg, rgguubg, rbru, rb, rrrw, wbu, gbgb, uururg, ubru, rugb, bbru, b, rggurg, wgru, bgrwb, rrgubg, ubrrbg, wgurru, rrrrw, rbrwu, wubwb, wrbbr, bgbu, brrww, brg, gbwu, wrubuur, gur, grbr, gruwrrbg, bgwr, wgugbgb, rwbru, wuwr, rrg, ruwg, rgwgr, ubu, wbr, bwg, gbu, bgrwrb, wwrw, bb, gr, rug, grr, ubwb, rbruwbu, guggug, ugu, rwbuu, bbur, wbrww, wubw, br, gruu, gwr, wrrwwu, wug, bgu, bgb, wugb, grb, rbbg, grgbwgb, rwu, bwrbb, uwrbbru, bbu, wrg, rwg, ggbgbg, wbwru, wrgrw, bburr, bgr, rgbg, bwwwugrb, uwu, rwuwrg, gguburu, uwubwu, wb, wgguug, ugrbw, rbgu, rwwu, ggbbgb, gw, wgg, rrw, uurg, uubg, bgurgb, uwgbr, wbrwu, rrbb, rww, bwgb, uugru, ggrbub, wubgw, rwwugr, uuwur, burbrg, bbr, ggb, wgr, gwbgw, rrbu, wuwwrwb, rbbr, uubw, buuu, ubbwggu, brr, urguww, uggwwgw, ugw, ug, rub, grrrwu, wurburgg, wwww, ruu, wrb, rrur, urggr, bwbwwwrg, wwbu, bbg, uwb, ggugu, gbbr, rbrgw, bg, bbuu, uwrgrg, ggbwrgw, wwgwugr, wgbwuwb, gbrwg, bbw, wwrgu, rgrwrbwb, wwwg, gugbgbg, bwrwub, rw, gbb, ggw, rrb, urrbbwb, urbu, grg, rbugggb, bruwg, uubgwgw, bw, uubgu, rru, rwww, gu, wrbrg, guu, wgu, ruuru, wubrrg, brugrg, uuggb, wrurg, rgb, rbu, urg, buw, grwbg, gwuw, grbbg, wuwu, gbgbbw, uugrwrww, wbguub, grrgbug, u, uug, uwr, wrwb, gbg, bru, wwg, bbwur, bbbbbbbw, bugbb, rwurrgr, wwb, ugbbw, bug, grgg, bgwgrrb, uggu, rurguru, wwr, rbw, ubwwgw, wrrw, rrbg, g, rgrbub, gruggw, bur, ubgb, bgg, uwur, ur, bbbwb, gwbu, wuww, uruuuubb, wbru, ugggg, gbuu, rgg, wwwug, gbrwgg, guwgr, urw, wbur, bu, rur, rrubr, ugb, ubrgrb, rbbgg, rbwrg, rggw, rguug, wwu, uur, wrrguggu, brbb, bwwwbr, guw, gugw, wgubwu, rrr, ub, ru, brrbbruw, bwwgrrbb, rubgu, uggwwg, wbb, rwr, r, ruuu, wbggg, wwwu, grbrb, rrrrr, ruwb, wuuw, rbbb, ugg, wbg, rguwr, wbw, wbuwg, ubbgrbb, urugu, rbubw, wrgwuuwu, grw, ubbbu, bwurb, rwuu, rgbbwur, urbuu, uww, wuw, bwurgu, wur, wuwwrbur, wwuu, wbgw, grbbbw, wuub, urb, wuuguuwg, wg, gwrgr, gbug, gbrbw, rwgg, brbbu, bwww, wrbbbu, wwgbggb, burug, gww, ubgrrb, bgw, rgbb, brb, wbuu, brw, ggrbrbwg, uwruw, wrgurrbb, guwrgu, rr, ugggrbr, bgrgg, urgbrbrb, wrw, wwubggu, ugurwg, grrg, bwrb, rrgwuuw, rrru, wurg, bgurwu, rgurbb, uuub, uuwb, rrrg, wrgrrrww, uwg, bgbguu, wrgwb, wwwru, rg, rrurwur, urrbb, bww, rrwwbbb, ubr, wgrbu, gru, ubg, gb, ggr, gbwbwru, uuw, rbb, gugwrg, gwb, bbb, rgrggw, uw, wggbbg, rwgubgb, gwbw, brrr, gugbwu, rwrr, uuuwbb, ugrrr, rgu, wubrwr, wrr, bwb, bwbgurb, rrrub, wub, rwgrug, rurb, gwrgrbr, rbrwbb, wwrgbg, urr, bwu, bwgu, rbuuw, bbub, wbbwubu, ggg, wbwwgwb, buwbg, wwwuru, rbg, gubugg, gbwb, www, rbr, ubur, grbbw, wgw, gbw, wgrw, rguuuu, rwb, gbrw, bbbb, gururbb, rbggwu, bub, bgbr, gurb, rrbgrb, rurwb, ugr, wgwrg, ruw, bgrr, gwu, gbr, uwugwru, wru, wr, ugbruw, grbubb, gwg, gwggurg, gugbr, ugubbgb, uwrw, uru, bwr, rgr, rbgrwg, buuw, ugbur, urgub, wurrrgww, rgguuwru, burr, rgw, rbruw, rwbwbbr, bwguw, uub, wgb, rgur, ubb, urwg, rwgww, wgub, rwwrgu, gg, rgug, gub, bggr, uuu, uu, rbug
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+wugwwgrwbgugurwurbggbrwruwuuwurwrbrwgruuubuurur
+wgbuwbrbwrgrbwuwggugggguuwgbrbwgrgwrurrurbrgugrgwrb
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+ubgwwggbwbuwbbbbbbggbwrgrbgrgugurwggrubburrubrwrrggrgg

2024/gareth/day20/day20.go

@@ -0,0 +1,191 @@
+package day20
+
+import (
+	"container/heap"
+	"fmt"
+	"math"
+	"strings"
+)
+
+var directions = [][]int{
+	{0, 1},  // Right
+	{1, 0},  // Down
+	{0, -1}, // Left
+	{-1, 0}, // Up
+}
+
+type State struct {
+	row, col, dir, score int
+	path                 []string
+	//Would rather use tuple as key but cant get to work
+	costMap map[[2]int]int
+}
+
+type PriorityQueue []State
+
+func Part1(input string) int {
+	maze := parseInput(input)
+	_, path, costMap := solveMaze(maze)
+	cheats := findCheats(path, costMap)
+	return cheats
+}
+
+func Part2(input string) int {
+	maze := parseInput(input)
+	_, path, costMap := solveMaze(maze)
+	cheats := findCheatsPart2(path, costMap)
+	return cheats
+}
+
+func parseInput(input string) []string {
+	parts := strings.Split(input, "\n")
+	maze := []string{}
+	maze = append(maze, parts...)
+
+	return maze
+}
+
+func (pq PriorityQueue) Len() int { return len(pq) }
+func (pq PriorityQueue) Less(i, j int) bool {
+	return pq[i].score < pq[j].score
+}
+func (pq PriorityQueue) Swap(i, j int) { pq[i], pq[j] = pq[j], pq[i] }
+
+func (pq *PriorityQueue) Push(x interface{}) {
+	*pq = append(*pq, x.(State))
+}
+
+func (pq *PriorityQueue) Pop() interface{} {
+	old := *pq
+	n := len(old)
+	item := old[n-1]
+	*pq = old[0 : n-1]
+	return item
+}
+
+func solveMaze(maze []string) (int, []string, map[[2]int]int) {
+	rows := len(maze)
+	cols := len(maze[0])
+
+	// Locate start and end points
+	var startRow, startCol, endRow, endCol int
+	for i := 0; i < rows; i++ {
+		for j := 0; j < cols; j++ {
+			if maze[i][j] == 'S' {
+				startRow, startCol = i, j
+			} else if maze[i][j] == 'E' {
+				endRow, endCol = i, j
+			}
+		}
+	}
+
+	// Priority queue and visited set
+	pq := &PriorityQueue{}
+	heap.Init(pq)
+	startPath := []string{fmt.Sprintf("(%d,%d)", startRow, startCol)}
+	startCostMap := map[[2]int]int{
+		{startRow, startCol}: 0,
+	}
+	heap.Push(pq, State{startRow, startCol, 0, 0, startPath, startCostMap})
+	visited := make(map[[3]int]bool)
+
+	for pq.Len() > 0 {
+		cur := heap.Pop(pq).(State)
+
+		// If reached the end point, return the score and path
+		if cur.row == endRow && cur.col == endCol {
+			return cur.score, cur.path, cur.costMap
+		}
+
+		// Mark as visited
+		key := [3]int{cur.row, cur.col, cur.dir}
+		if visited[key] {
+			continue
+		}
+		visited[key] = true
+
+		// Explore moves
+		for i := 0; i < 4; i++ {
+			// Compute new direction
+			newDir := (cur.dir + i) % 4
+
+			// Compute new position
+			newRow := cur.row + directions[newDir][0]
+			newCol := cur.col + directions[newDir][1]
+
+			// Check bounds and wall
+			if newRow >= 0 && newRow < rows && newCol >= 0 && newCol < cols && maze[newRow][newCol] != '#' {
+				newCost := cur.score + 1
+				if oldCost, exists := cur.costMap[[2]int{newRow, newCol}]; !exists || newCost < oldCost {
+					// Update cost map
+					newCostMap := make(map[[2]int]int)
+					for k, v := range cur.costMap {
+						newCostMap[k] = v
+					}
+					newCostMap[[2]int{newRow, newCol}] = newCost
+
+					// Update path
+					newPath := append([]string{}, cur.path...)
+					newPath = append(newPath, fmt.Sprintf("(%d,%d)", newRow, newCol))
+
+					heap.Push(pq, State{
+						newRow,
+						newCol,
+						newDir,
+						newCost,
+						newPath,
+						newCostMap,
+					})
+				}
+			}
+		}
+	}
+
+	return -1, nil, nil // No path found
+}
+
+func findCheats(path []string, costLookup map[[2]int]int) int {
+
+	totalCheats := 0
+	for index, position := range path {
+
+		var row, col int
+		//Should be a better way to do this
+		fmt.Sscanf(position, "(%d,%d)", &row, &col)
+
+		for _, dir := range directions {
+			newRow := row + (dir[0] * 2)
+			newCol := col + (dir[1] * 2)
+
+			if cost, exists := costLookup[[2]int{newRow, newCol}]; exists {
+				if cost > index && (cost-index-2) >= 100 {
+					totalCheats++
+				}
+			}
+		}
+	}
+	return totalCheats
+}
+
+func findCheatsPart2(path []string, costLookup map[[2]int]int) int {
+	totalCheats := 0
+
+	for index, position := range path {
+		var row, col int
+		//Should be a better way to do this
+		fmt.Sscanf(position, "(%d,%d)", &row, &col)
+
+		for x1 := row - 20; x1 <= row+20; x1++ {
+			for y1 := col - 20 + int(math.Abs(float64(row-x1))); y1 <= col+20-int(math.Abs(float64(row-x1))); y1++ {
+				if cost, exists := costLookup[[2]int{x1, y1}]; exists && cost != -1 {
+					diff := cost - index - int(math.Abs(float64(row-x1))) - int(math.Abs(float64(col-y1)))
+					if cost > index && diff >= 100 {
+						totalCheats++
+					}
+				}
+			}
+		}
+	}
+
+	return totalCheats
+}

2024/gareth/day20/day20_test.go

@@ -0,0 +1,45 @@
+package day20
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`###############
+	#...#...#.....#
+	#.#.#.#.#.###.#
+	#S#...#.#.#...#
+	#######.#.#.###
+	#######.#.#...#
+	#######.#.###.#
+	###..E#...#...#
+	###.#######.###
+	#...###...#...#
+	#.#####.#.###.#
+	#.#...#.#.#...#
+	#.#.#.#.#.#.###
+	#...#...#...###
+	###############`)
+	assert.Equal(t, 44, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`###############
+	#...#...#.....#
+	#.#.#.#.#.###.#
+	#S#...#.#.#...#
+	#######.#.#.###
+	#######.#.#...#
+	#######.#.###.#
+	###..E#...#...#
+	###.#######.###
+	#...###...#...#
+	#.#####.#.###.#
+	#.#...#.#.#...#
+	#.#.#.#.#.#.###
+	#...#...#...###
+	###############`)
+	assert.Equal(t, 285, r)
+}

2024/gareth/day20/input.txt

@@ -0,0 +1,141 @@
+#############################################################################################################################################
+#...###...#.......###...........###...#...#####...#...#...###...#...#.........###...#.......#...#.....#.........#...........#...............#
+#.#.###.#.#.#####.###.#########.###.#.#.#.#####.#.#.#.#.#.###.#.#.#.#.#######.###.#.#.#####.#.#.#.###.#.#######.#.#########.#.#############.#
+#.#.#...#.#.#...#...#.#.........#...#.#.#...#...#.#.#...#.....#.#.#.#.....#...#...#.#...#...#.#.#.#...#.....#...#.#.........#.....#.........#
+#.#.#.###.#.#.#.###.#.#.#########.###.#.###.#.###.#.###########.#.#.#####.#.###.###.###.#.###.#.#.#.#######.#.###.#.#############.#.#########
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+#############################################################################################################################################

2024/gareth/day21/day21.go

@@ -0,0 +1,125 @@
+package day21
+
+import (
+	"strconv"
+	"strings"
+)
+
+type coordinate struct {
+	row, col int
+}
+
+var numberPad = map[string]coordinate{
+	"7": {0, 0}, "8": {0, 1}, "9": {0, 2},
+	"4": {1, 0}, "5": {1, 1}, "6": {1, 2},
+	"1": {2, 0}, "2": {2, 1}, "3": {2, 2},
+	"0": {3, 1}, "A": {3, 2},
+}
+
+var robotPad = map[string]coordinate{
+	"^": {0, 1}, "A": {0, 2},
+	"<": {1, 0}, "v": {1, 1}, ">": {1, 2},
+}
+
+type cacheKey struct {
+	sequence   string
+	iterations int
+}
+
+var memo = make(map[cacheKey]int)
+
+func Part1(input string) int {
+	codes := parseInput(input)
+
+	numpadGraph := createGraph(numberPad, coordinate{3, 0})
+	dirpadGraph := createGraph(robotPad, coordinate{0, 0})
+
+	total := 0
+	for _, code := range codes {
+		codeInt, _ := strconv.Atoi(code[:len(code)-1])
+		total += codeInt * getLength(code, 3, true, numpadGraph, dirpadGraph)
+	}
+	return total
+}
+
+func Part2(input string) int {
+	codes := parseInput(input)
+
+	numpadGraph := createGraph(numberPad, coordinate{3, 0})
+	dirpadGraph := createGraph(robotPad, coordinate{0, 0})
+
+	total := 0
+	for _, code := range codes {
+		codeInt, _ := strconv.Atoi(code[:len(code)-1])
+		total += codeInt * getLength(code, 26, true, numpadGraph, dirpadGraph)
+	}
+	return total
+}
+
+func parseInput(input string) []string {
+	parts := strings.Split(input, "\n")
+	codes := []string{}
+	codes = append(codes, parts...)
+	return codes
+}
+
+func createGraph(keypad map[string]coordinate, invalidCoords coordinate) map[string]string {
+	graph := make(map[string]string)
+
+	for a, coordA := range keypad {
+		for b, coordB := range keypad {
+			x1, y1 := coordA.row, coordA.col
+			x2, y2 := coordB.row, coordB.col
+
+			path := strings.Repeat("<", max(0, y1-y2)) +
+				strings.Repeat("v", max(0, x2-x1)) +
+				strings.Repeat("^", max(0, x1-x2)) +
+				strings.Repeat(">", max(0, y2-y1))
+
+			if invalidCoords == (coordinate{x1, y2}) || invalidCoords == (coordinate{x2, y1}) {
+				path = reverseString(path)
+			}
+			graph[a+"->"+b] = path + "A"
+		}
+	}
+
+	return graph
+}
+
+func reverseString(s string) string {
+	runes := []rune(s)
+	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
+		runes[i], runes[j] = runes[j], runes[i]
+	}
+	return string(runes)
+}
+
+func getLength(sequence string, iterations int, firstIter bool, numpadGraph map[string]string, dirpadGraph map[string]string) int {
+
+	if iterations == 0 {
+		return len(sequence)
+	}
+
+	key := cacheKey{sequence: sequence, iterations: iterations}
+	if cachedResult, exists := memo[key]; exists {
+		return cachedResult
+	}
+
+	graph := numpadGraph
+	if !firstIter {
+		graph = dirpadGraph
+	}
+
+	totalLength := 0
+	prev := "A"
+	for _, char := range sequence {
+		graphKey := prev + "->" + string(char)
+		if subSequence, exists := graph[graphKey]; exists {
+			totalLength += getLength(subSequence, iterations-1, false, numpadGraph, dirpadGraph)
+		}
+		prev = string(char)
+	}
+
+	memo[key] = totalLength
+	return totalLength
+}

2024/gareth/day21/day21_test.go

@@ -0,0 +1,25 @@
+package day21
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`029A
+980A
+179A
+456A
+379A`)
+	assert.Equal(t, 126384, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`029A
+980A
+179A
+456A
+379A`)
+	assert.Equal(t, 126384, r)
+}

2024/gareth/day21/input.txt

@@ -0,0 +1,5 @@
+985A
+540A
+463A
+671A
+382A

2024/gareth/day22/day22.go

@@ -0,0 +1,112 @@
+package day22
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type Queue struct {
+	data []int
+	size int
+}
+
+func NewQueue(size int) *Queue {
+	return &Queue{
+		data: make([]int, 0, size),
+		size: size,
+	}
+}
+
+func (queue *Queue) Push(value int) {
+	if len(queue.data) == queue.size {
+		queue.data = queue.data[1:]
+	}
+	queue.data = append(queue.data, value)
+}
+
+func (queue *Queue) Get() []int {
+	return queue.data
+}
+
+func (queue *Queue) String() string {
+	strs := make([]string, len(queue.data))
+	for i, val := range queue.data {
+		strs[i] = fmt.Sprintf("%d", val)
+	}
+	return strings.Join(strs, ", ")
+}
+
+func Part1(input string) int {
+	secretNumbers := parseInput(input)
+
+	total := 0
+	for _, number := range secretNumbers {
+		for i := 0; i < 2000; i++ {
+			number = getNextNumber(number)
+		}
+		total += number
+	}
+	return total
+}
+
+func Part2(input string) int {
+	secretNumbers := parseInput(input)
+	memo := make(map[string]int)
+
+	for _, number := range secretNumbers {
+		seen := make(map[string]bool)
+		queue := NewQueue(4)
+		prevNumber := secretNumbers[0] % 10
+
+		for i := 0; i < 2000; i++ {
+			singleNumber := number % 10
+			cost := singleNumber - prevNumber
+			queue.Push(cost)
+			if i > 3 {
+				if _, ok := seen[queue.String()]; !ok {
+					memo[queue.String()] += singleNumber
+					seen[queue.String()] = true
+				}
+			}
+			prevNumber = singleNumber
+			number = getNextNumber(number)
+		}
+	}
+	return maxMapValue(memo)
+}
+
+func parseInput(input string) []int {
+	parts := strings.Split(input, "\n")
+	secretNumbers := []int{}
+	for _, part := range parts {
+		num, _ := strconv.Atoi(part)
+		secretNumbers = append(secretNumbers, num)
+	}
+
+	return secretNumbers
+}
+
+func getNextNumber(number int) int {
+	step1 := (number * 64) ^ number
+	step1 = step1 % 16777216
+
+	step2 := (step1 / 32) ^ step1
+	step2 = step2 % 16777216
+
+	step3 := (step2 * 2048) ^ step2
+	step3 = step3 % 16777216
+
+	return step3
+}
+
+func maxMapValue(memo map[string]int) int {
+	maxValue := 0
+
+	for _, value := range memo {
+		if value > maxValue {
+			maxValue = value
+		}
+	}
+	return maxValue
+}

2024/gareth/day22/day22_test.go

@@ -0,0 +1,23 @@
+package day22
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`1
+10
+100
+2024`)
+	assert.Equal(t, 37327623, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`1
+2
+3
+2024`)
+	assert.Equal(t, 23, r)
+}

2024/gareth/go.mod

@@ -0,0 +1,11 @@
+module aoc2024
+
+go 1.23.2
+
+require github.com/stretchr/testify v1.10.0
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)