day02

day04
Day02
2025-12-04 11:56:36 +00:00 · 2025-12-04 11:53:17 +00:00 · 2025-12-02 06:54:15 +00:00 · 2025-12-03 20:03:14 +00:00 · 2025-12-01 18:11:11 +00:00 · 2025-12-01 14:04:11 +00:00
249 changed files with 69028 additions and 120 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,3 @@
+2024
+2023/*
+
--- a/2022/go/day12/day12.go
+++ b/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)
+}
--- a/2022/go/day12/day12_test.go
+++ b/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)
+}
--- a/2022/go/day12/input.txt
+++ b/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
--- a/2022/go/day13/day13.go
+++ b/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)
+}
--- a/2022/go/day13/day13_test.go
+++ b/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)
+}
--- a/2022/go/day13/input.txt
+++ b/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]]],[[]]]
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+[[5,[[0,6,0,2,1],4,9,[6,2]],9,[[4,4,8,0,0]],[[],[5,3,1]]],[8],[[[6,10]],2,6]]
+
+[[[[6,1,5,10],6,[8,7,3]],5,[1,[10,5,7],2],[[7],8,6,8]],[[[10,10,5,4]],3]]
+[[],[10,10,[9,[8,2,0,10],9,[7,7]],8,[6,9,[6,8],[5,5,10,5],4]],[5,8,10,[0]],[[[10]],[5,10,5,[0,5,9,10]],3],[]]
+
+[[[[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]]]
--- a/2022/go/utils/inputFile.go
+++ b/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)
+}
+
--- a/2023/gareth/day01/day01.go
+++ b/2023/gareth/day01/day01.go
@@ -0,0 +1,61 @@
+package day01
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+func Part1(input string) int {
+	total := 0
+	lines := strings.Split(input, "\r\n")
+	for _, line := range lines {
+		regex := regexp.MustCompile("[a-zA-Z]")
+		numbers := regex.ReplaceAllString(line, "")
+		number := string(numbers[0]) + string(numbers[len(numbers)-1])
+		i, _ := strconv.Atoi(number)
+		total += i
+	}
+
+	return total
+}
+
+func Part2(input string) int {
+	values := map[string]string{
+		"one":   "1",
+		"two":   "2",
+		"three": "3",
+		"four":  "4",
+		"five":  "5",
+		"six":   "6",
+		"seven": "7",
+		"eight": "8",
+		"nine":  "9",
+	}
+	lines := strings.Split(input, "\r\n")
+	s := ""
+
+	total := 0
+	for _, line := range lines {
+		numbers := []string{}
+		for _, c := range line {
+			s = s + string(c)
+			if num, err := strconv.Atoi(string(c)); err == nil {
+				numbers = append(numbers, strconv.Itoa(num))
+				s = ""
+			}
+			for key, value := range values {
+				if strings.Contains(s, key) {
+					numbers = append(numbers, value)
+					buffer := s[len(s)-1]
+					s = "" + string(buffer)
+				}
+			}
+		}
+		number := numbers[0] + numbers[len(numbers)-1]
+		i, _ := strconv.Atoi(number)
+		total += i
+		s = ""
+	}
+	return total
+}
--- a/2023/gareth/day01/day01_test.go
+++ b/2023/gareth/day01/day01_test.go
@@ -0,0 +1,25 @@
+package day01
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet`)
+	assert.Equal(t, 142, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen`)
+	assert.Equal(t, 281, r)
+}
--- a/2023/gareth/day01/input.txt
+++ b/2023/gareth/day01/input.txt
--- a/2023/gareth/day07/day07.go
+++ b/2023/gareth/day07/day07.go
@@ -0,0 +1,40 @@
+package day06
+
+type Race struct {
+	Time     int
+	Distance int
+}
+
+func Part1(input string) int {
+	var Races []Race
+	Races = append(Races, Race{56, 546})
+	Races = append(Races, Race{97, 1927})
+	Races = append(Races, Race{78, 1131})
+	Races = append(Races, Race{75, 1139})
+
+	total := 1
+	for _, r := range Races {
+		halfTime := r.Time / 2
+		for i := 0; i <= halfTime; i++ {
+			raceDis := i * (r.Time - i)
+			if raceDis > r.Distance {
+				total = total * (r.Time - (i * 2) + 1)
+				break
+			}
+		}
+	}
+	return total
+}
+
+func Part2(input string) int {
+	r := Race{56977875, 546192711311139}
+	halfTime := r.Time / 2
+	for i := 0; i <= halfTime; i++ {
+		raceDis := i * (r.Time - i)
+		if raceDis > r.Distance {
+			return r.Time - (i * 2) + 1
+
+		}
+	}
+	return -1
+}
--- a/2023/gareth/day07/day07_test.go
+++ b/2023/gareth/day07/day07_test.go
@@ -0,0 +1,16 @@
+package day06
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(``)
+	assert.Equal(t, 1624896, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(``)
+	assert.Equal(t, 32583852, r)
+}
--- a/2023/gareth/day07/input.txt
+++ b/2023/gareth/day07/input.txt
--- a/2023/gareth/day08/day08.go
+++ b/2023/gareth/day08/day08.go
@@ -0,0 +1,99 @@
+package day08
+
+import (
+	"fmt"
+	"math"
+	"regexp"
+	"strings"
+)
+
+type Direction struct {
+	Destination string
+	Left        string
+	Right       string
+}
+
+func Part1(input string) int {
+	lines := strings.Split(input, "\r\n")
+	dir := make(map[string]Direction)
+	for _, line := range lines {
+		pattern := `[A-Z]+`
+		re := regexp.MustCompile(pattern)
+		matches := re.FindAllString(line, -1)
+		dir[matches[0]] = Direction{matches[0], matches[1], matches[2]}
+	}
+
+	currentloc := "AAA"
+	m := "LRLRRLLRRLRRRLRLRRRLLRRLLLLRRRLRRRLRRLRRLRRRLRRRLLRRLRLRRLRRRLLLRRLRRLLRLLRRRLRRRLLRLRRRLRLLRRLLLRLRRRLRRRLRRRLLRLRRRLLRRLRLRLLRRLRRRLRRLRLLRLRRRLRRLRLRLRRLRRRLRRRLRRRLRRLRRRLLRRLRRLLRRRLLRLRLRLRLLLRRLRLRRLRRLRRLRRLRRRLRRRLRLRRRLRLRRRLRRLRLLRLRRLRLRLLLRLLLRRRLRRLLLRLRRRR"
+	moves := strings.Split(m, "")
+	moveIndex := 0
+	total := 0
+	for {
+		move := moves[moveIndex]
+		if move == "R" {
+			currentloc = dir[currentloc].Right
+		} else {
+			currentloc = dir[currentloc].Left
+		}
+		total++
+		if currentloc == "ZZZ" {
+			return total
+		}
+		moveIndex = int(math.Mod(float64(moveIndex+1), float64(len(moves))))
+	}
+	return -1
+}
+
+func Part2(input string) int {
+	lines := strings.Split(input, "\r\n")
+	dir := make(map[string]Direction)
+	for _, line := range lines {
+		pattern := `[A-Z1-9]+`
+		re := regexp.MustCompile(pattern)
+		matches := re.FindAllString(line, -1)
+		dir[matches[0]] = Direction{matches[0], matches[1], matches[2]}
+	}
+	var startingLoc []string
+	for _, loc := range dir {
+		des := loc.Destination
+		if des[2] == 'A' {
+			startingLoc = append(startingLoc, des)
+		}
+	}
+
+	m := "LRLRRLLRRLRRRLRLRRRLLRRLLLLRRRLRRRLRRLRRLRRRLRRRLLRRLRLRRLRRRLLLRRLRRLLRLLRRRLRRRLLRLRRRLRLLRRLLLRLRRRLRRRLRRRLLRLRRRLLRRLRLRLLRRLRRRLRRLRLLRLRRRLRRLRLRLRRLRRRLRRRLRRRLRRLRRRLLRRLRRLLRRRLLRLRLRLRLLLRRLRLRRLRRLRRLRRLRRRLRRRLRLRRRLRLRRRLRRLRLLRLRRLRLRLLLRLLLRRRLRRLLLRLRRRR"
+	moves := strings.Split(m, "")
+	moveIndex := 0
+	startingLocIndex := 0
+	currentloc := ""
+	total := 0
+	for {
+		for _, loc := range startingLoc {
+			currentloc = loc
+			move := moves[moveIndex]
+			if move == "R" {
+				currentloc = dir[currentloc].Right
+			} else {
+				currentloc = dir[currentloc].Left
+			}
+			startingLoc[startingLocIndex] = currentloc
+			startingLocIndex = int(math.Mod(float64(startingLocIndex+1), float64(len(startingLoc))))
+		}
+		total++
+		endFlag := false
+		for _, loc := range startingLoc {
+			if loc[2] == 'Z' {
+				endFlag = true
+			} else {
+				endFlag = false
+				break
+			}
+		}
+		if endFlag == true {
+			return total
+		}
+		moveIndex = int(math.Mod(float64(moveIndex+1), float64(len(moves))))
+		fmt.Println(total)
+	}
+	return -2
+}
--- a/2023/gareth/day08/day08_test.go
+++ b/2023/gareth/day08/day08_test.go
@@ -0,0 +1,25 @@
+package day08
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`AAA = (BBB, BBB)
+BBB = (AAA, ZZZ)
+ZZZ = (ZZZ, ZZZ)`)
+	assert.Equal(t, 6, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`11A = (11B, XXX)
+11B = (XXX, 11Z)
+11Z = (11B, XXX)
+22A = (22B, XXX)
+22B = (22C, 22C)
+22C = (22Z, 22Z)
+22Z = (22B, 22B)
+XXX = (XXX, XXX)`)
+	assert.Equal(t, 6, r)
+}
--- a/2023/gareth/day08/input.txt
+++ b/2023/gareth/day08/input.txt
@@ -0,0 +1,746 @@
+PNM = (QGP, BFT)
+HNH = (JPB, GMH)
+FNN = (DDN, PTB)
+VJS = (LHL, THF)
+KPV = (JFQ, TRN)
+BDQ = (BCP, LNN)
+SDC = (CVC, THN)
+MKN = (HXP, RHH)
+KXH = (FPR, GTC)
+TPD = (SPS, LFR)
+GQT = (TKX, SHR)
+CHM = (VBJ, SBV)
+FMR = (BSR, TTH)
+VVT = (PMJ, LDH)
+DCX = (KNH, GKT)
+HMK = (VNX, XRC)
+LDP = (JHJ, SLT)
+TBS = (QDR, PNM)
+QPG = (GFN, XGN)
+DRB = (CBX, NBL)
+BQP = (QQL, BVH)
+QRR = (TJT, DMP)
+CLL = (LMC, HXV)
+NLX = (CJS, RVR)
+DPT = (SKJ, TDH)
+GQV = (NDN, TPD)
+NTG = (MSK, VMX)
+LHP = (VBJ, SBV)
+JKC = (TLG, CNT)
+JKL = (GNF, RFM)
+KTS = (NKH, RJC)
+MHM = (SLG, JQX)
+ZZZ = (LFM, MHM)
+MKB = (RQJ, GKB)
+LLC = (MBV, QKM)
+LNT = (XFG, CGX)
+XDB = (TSB, NSM)
+RFD = (DCT, TMM)
+BCL = (JXM, JXM)
+JTM = (CHM, LHP)
+GFN = (VRT, VSS)
+KBV = (FXC, JDS)
+THM = (GMG, GMG)
+PPH = (KTK, MXN)
+RJD = (LQG, NHJ)
+QDQ = (GDQ, KQG)
+VJL = (QKM, MBV)
+NXN = (JGX, QKD)
+LQR = (BPL, CJF)
+VMM = (FMR, XMJ)
+DFA = (TJT, DMP)
+MHK = (XGH, SBK)
+QVR = (LKM, FNR)
+GMN = (DPT, TBK)
+CGX = (PTT, NSL)
+KSM = (CNT, TLG)
+BVH = (MQD, JSL)
+HHX = (FVT, PGL)
+JQH = (DCT, TMM)
+TTH = (VVT, GNH)
+GMG = (MHM, LFM)
+RMP = (XMV, MLT)
+SXH = (VJL, LLC)
+MGP = (SHN, GHV)
+GDQ = (VQM, TRH)
+XFG = (NSL, PTT)
+BLA = (XLR, VNR)
+RVL = (PQK, BQH)
+STC = (THR, NQM)
+TLT = (TTK, GLQ)
+BKS = (XCC, SLX)
+QNP = (RQR, XPH)
+CKR = (TKG, MVD)
+SNQ = (LSP, SGQ)
+MCM = (THX, PXM)
+THF = (CTS, QHD)
+PLT = (MTF, FRP)
+FRS = (KSN, RKG)
+RTB = (SRD, BDR)
+SGV = (BCL, BCL)
+NBL = (VKC, QJV)
+PTT = (HJT, TFN)
+STJ = (CMM, JXD)
+CTP = (XFP, TLT)
+SRD = (DXH, DPG)
+KMP = (MRK, JHM)
+FXP = (NMP, QXT)
+HLL = (NKR, HSN)
+TNQ = (CVC, THN)
+TRQ = (KMP, LVQ)
+GGV = (HQQ, RRH)
+SDM = (JJB, DCG)
+FNB = (CBB, VXB)
+GBX = (CRK, NXN)
+FPB = (DGR, KPV)
+SJT = (STQ, JKL)
+LXC = (CQB, GSG)
+GTC = (PTF, XDB)
+VTT = (KVR, KVR)
+XMX = (RMN, JTD)
+FFP = (JNV, QPG)
+QBF = (TGN, TMP)
+CMB = (FQC, JNX)
+CJS = (NGV, GDB)
+VRM = (QJJ, LXC)
+MPG = (SGC, CHD)
+PRV = (GNT, QDP)
+CBH = (SQM, DRP)
+DDR = (MCM, BDK)
+FGM = (NDQ, SJQ)
+QHV = (FQC, JNX)
+QXF = (MVV, DRB)
+FFL = (BPX, KMG)
+KJM = (MVD, TKG)
+XBX = (QDR, PNM)
+FRD = (XPG, GDL)
+KDG = (CBB, VXB)
+KDM = (KVR, HPN)
+MCP = (HCQ, SHT)
+SVP = (LKM, FNR)
+LBC = (JLT, DVR)
+GXQ = (HSN, NKR)
+FSF = (NQS, QCK)
+PRF = (CNF, TKF)
+TPL = (DFS, MCH)
+DVR = (KDJ, QSR)
+LVT = (MKK, VCB)
+RHK = (LRM, JJV)
+MTJ = (KKQ, BDB)
+CCH = (MTJ, JGS)
+JDS = (KMQ, FNN)
+GPG = (BGT, MNM)
+XLC = (DDV, LVT)
+HMV = (TLC, LDT)
+JHJ = (HNX, XCF)
+QXT = (HLL, GXQ)
+NNS = (MRQ, FGM)
+PGL = (JLX, SKT)
+PPJ = (QTS, XVR)
+TSB = (JTK, LMH)
+JJV = (QJH, KCX)
+SSX = (BXM, BQC)
+QGP = (DLQ, MXH)
+TKX = (JCX, XRP)
+XQR = (BJG, GMN)
+SLX = (BLK, SJG)
+XGH = (DTT, MBM)
+SFM = (VTT, KDM)
+RRT = (RQJ, RQJ)
+HDC = (TKX, SHR)
+GQC = (CLL, SJR)
+HSN = (JTS, FLC)
+BLR = (NTL, LTR)
+JCS = (KMP, LVQ)
+BTG = (SDC, TNQ)
+GNT = (CVP, QBX)
+KVH = (TXL, MKX)
+LXS = (MGP, TTL)
+CTS = (QBL, NKN)
+LSP = (CXH, TGR)
+HLR = (JXD, CMM)
+MBM = (TCF, PRV)
+DNQ = (FRR, VNJ)
+GBK = (MSG, PDG)
+TTL = (SHN, GHV)
+SLG = (SPK, MFB)
+SGS = (RQC, TGB)
+KMQ = (DDN, PTB)
+MJJ = (RTK, LVN)
+JHM = (PGH, GGX)
+SMD = (JQS, FKR)
+JNP = (CMS, GSM)
+NDD = (MSK, VMX)
+XXK = (JVR, FSF)
+TXL = (RDM, VJS)
+MTF = (GTK, QJK)
+TTK = (KJM, CKR)
+NVL = (JLF, BNV)
+KHX = (KSS, GPG)
+FVR = (FVT, PGL)
+KSN = (VDX, SVM)
+FXF = (SQQ, TQC)
+NPS = (FKR, JQS)
+XVR = (CHL, PLN)
+MFB = (CFL, PBB)
+VXC = (LNT, MLQ)
+LHL = (CTS, QHD)
+TXX = (DMS, DFR)
+MQJ = (TXX, VMR)
+QPK = (JBH, KXM)
+LMC = (XLC, CRR)
+TFN = (JTM, RPB)
+PDG = (NKS, CBH)
+PGH = (PVM, XXK)
+KPX = (HXP, RHH)
+HLV = (BXM, BQC)
+JGK = (JCS, TRQ)
+KKQ = (SFK, MCF)
+PQF = (HBK, RMP)
+KXM = (RTB, FFQ)
+NPR = (QQT, SNQ)
+FRP = (QJK, GTK)
+DGX = (PDF, HCB)
+PLP = (KTK, MXN)
+TCM = (XFT, KPH)
+QQL = (JSL, MQD)
+QTS = (PLN, CHL)
+QFG = (RXM, PHM)
+JJB = (LXS, KTH)
+LGS = (VXF, BGH)
+MBV = (BTJ, BRH)
+BTJ = (FKB, QTL)
+VNR = (TKS, LQR)
+GVN = (PJR, XMX)
+XLL = (GSK, RXC)
+GNF = (RVL, BTC)
+LMD = (NXN, CRK)
+NNN = (QQK, BDQ)
+QBD = (VQR, XJB)
+GSM = (LVR, VMJ)
+NKN = (RFD, JQH)
+HMC = (GSK, RXC)
+LVN = (KDG, FNB)
+CBX = (QJV, VKC)
+RRF = (GQT, HDC)
+RCV = (XQR, HRK)
+DMS = (HNP, XKR)
+LXP = (LNJ, NVL)
+CFJ = (FXC, JDS)
+HPT = (BVS, FJQ)
+KTH = (TTL, MGP)
+XMV = (XNL, TDJ)
+STQ = (RFM, GNF)
+SJQ = (GGG, NQF)
+LKM = (GVN, SVX)
+VKK = (DCG, JJB)
+TCF = (QDP, GNT)
+XMQ = (XFT, KPH)
+QMD = (JHJ, SLT)
+KHB = (KMG, BPX)
+VPR = (CSD, BTG)
+PJB = (GGN, TSC)
+TVP = (SGC, CHD)
+BPX = (GQV, PQM)
+TSH = (QMD, LDP)
+KCV = (NMP, QXT)
+THX = (LMD, GBX)
+CFL = (CLR, GTN)
+FGK = (FJG, TRX)
+FKD = (XMJ, FMR)
+JVR = (NQS, QCK)
+RTK = (KDG, FNB)
+BHQ = (LPB, XMN)
+VNJ = (JGK, KHK)
+TMP = (JVK, PQF)
+KPT = (BNM, BVJ)
+QXX = (TMF, PNB)
+QBR = (HHX, FVR)
+TFL = (MCH, DFS)
+NQN = (DDR, RMX)
+LFG = (VTT, KDM)
+VDX = (SMD, NPS)
+VQM = (FPB, HGR)
+NDP = (SNQ, QQT)
+DGR = (JFQ, TRN)
+FFK = (VNJ, FRR)
+GTN = (DSP, MXS)
+MNH = (MCP, GFC)
+XRP = (KTT, BKX)
+LRM = (KCX, QJH)
+QKD = (TXT, MCK)
+VFH = (GMH, JPB)
+KVR = (THM, THM)
+MLQ = (CGX, XFG)
+RPB = (CHM, LHP)
+JNC = (BQS, TRT)
+RXC = (HRN, VKG)
+JLD = (QDH, SSP)
+TDJ = (LHC, KCB)
+VFQ = (JJV, LRM)
+FLC = (SSQ, HVF)
+XPH = (SXH, BVX)
+CXL = (HDC, GQT)
+JSL = (CGL, MJJ)
+KQG = (TRH, VQM)
+QJP = (PDG, MSG)
+TNP = (KMD, XMB)
+DQC = (QSL, DJF)
+QKK = (RRH, HQQ)
+HGR = (DGR, KPV)
+MXS = (GBK, QJP)
+BVX = (VJL, LLC)
+FRR = (KHK, JGK)
+QQT = (SGQ, LSP)
+KHL = (SCN, PRB)
+SKJ = (DLN, LJQ)
+TKS = (BPL, CJF)
+DTT = (PRV, TCF)
+NPV = (XFP, TLT)
+QHB = (NNS, RCZ)
+JPB = (GGS, KLG)
+NFQ = (BXH, FGK)
+DJF = (VVQ, QCT)
+MNF = (FNH, SJT)
+XPG = (CFJ, KBV)
+SVX = (PJR, XMX)
+TGR = (TVP, MPG)
+NTL = (RRT, MKB)
+MKK = (FRD, MCS)
+LVL = (LBV, TVZ)
+SKT = (FCX, DQC)
+NKR = (JTS, FLC)
+XFP = (TTK, GLQ)
+QGN = (MTG, QVL)
+JXD = (MHK, JSS)
+PQK = (SVP, QVR)
+VBJ = (SSX, HLV)
+TDH = (LJQ, DLN)
+MRK = (GGX, PGH)
+HCB = (HST, GJF)
+NSM = (LMH, JTK)
+LQG = (TNP, SHH)
+PMT = (KLV, JVZ)
+CNF = (CJN, VSG)
+GGS = (VHV, QQF)
+QKM = (BRH, BTJ)
+KRN = (DTH, HFG)
+TKV = (RXM, PHM)
+GKB = (FNX, QHB)
+GNH = (PMJ, LDH)
+RCZ = (FGM, MRQ)
+HFP = (KSN, RKG)
+JLX = (DQC, FCX)
+CMS = (LVR, VMJ)
+RXM = (QXX, LJR)
+TRH = (HGR, FPB)
+TPR = (JBC, KHX)
+MCS = (XPG, GDL)
+GKT = (MKN, KPX)
+RKG = (VDX, SVM)
+BDB = (MCF, SFK)
+TLG = (HGG, DCX)
+KLG = (QQF, VHV)
+RVR = (GDB, NGV)
+JBC = (GPG, KSS)
+BVS = (BHQ, PNX)
+DLQ = (SGS, LFP)
+BNL = (GFC, MCP)
+KNH = (MKN, KPX)
+BNV = (LLX, CBT)
+GVJ = (JNT, QKQ)
+SHH = (KMD, XMB)
+BXH = (TRX, FJG)
+QBL = (JQH, RFD)
+XNF = (TPR, NHG)
+TKG = (KSM, JKC)
+PLN = (VGM, JNC)
+PRB = (RCX, MQJ)
+CVP = (VFL, KHL)
+XLM = (TSC, GGN)
+QPT = (SRM, QTT)
+BQH = (QVR, SVP)
+BMB = (FGK, BXH)
+CRR = (LVT, DDV)
+SXM = (NDD, NTG)
+SGR = (NHJ, LQG)
+SRM = (HLR, STJ)
+CLT = (TGN, TMP)
+FFQ = (SRD, BDR)
+NBF = (TQC, SQQ)
+JBK = (LBB, LBB)
+PXM = (GBX, LMD)
+VNX = (GKR, HQT)
+DLN = (VXC, SNP)
+XNL = (KCB, LHC)
+QJH = (HNH, VFH)
+BGT = (DGX, MGN)
+QSL = (VVQ, QCT)
+BPL = (VMM, FKD)
+VKC = (SGR, RJD)
+THR = (HDJ, NQN)
+KFD = (JNP, TQH)
+XMN = (NBF, FXF)
+MXH = (LFP, SGS)
+DRP = (TKV, QFG)
+CMM = (MHK, JSS)
+RCM = (TXL, MKX)
+JLF = (CBT, LLX)
+XGN = (VSS, VRT)
+KCH = (FSR, GVJ)
+LPB = (NBF, FXF)
+MQC = (SFM, LFG)
+JGQ = (KQG, GDQ)
+VVQ = (MNH, BNL)
+BDR = (DXH, DPG)
+GGN = (DNQ, FFK)
+TGA = (FRS, HFP)
+VLT = (DXD, GPN)
+LFB = (CXL, RRF)
+KVD = (CSD, BTG)
+FJV = (DGP, HMV)
+HFG = (GGV, QKK)
+CBB = (PLT, RPJ)
+LDT = (PLP, PPH)
+BJG = (TBK, DPT)
+NFM = (HRK, XQR)
+QBX = (KHL, VFL)
+JNV = (XGN, GFN)
+VSS = (DCV, NHB)
+BRH = (FKB, QTL)
+SSF = (VQR, XJB)
+RDP = (NQM, THR)
+PQM = (TPD, NDN)
+JST = (RHD, LVL)
+NCH = (KPT, BBK)
+VFL = (PRB, SCN)
+HQQ = (JPM, LKS)
+JTK = (NVT, FJV)
+NVT = (DGP, HMV)
+FNX = (NNS, NNS)
+GSG = (XLL, HMC)
+SQQ = (THB, DRD)
+KMG = (GQV, PQM)
+KDJ = (CHN, NHX)
+MQD = (MJJ, CGL)
+TVZ = (KHB, FFL)
+JGX = (MCK, TXT)
+CNS = (JLT, DVR)
+JBH = (RTB, FFQ)
+GGX = (PVM, XXK)
+TGN = (JVK, PQF)
+JNX = (VKS, PRF)
+TLC = (PLP, PPH)
+TQH = (GSM, CMS)
+KHK = (TRQ, JCS)
+KMZ = (VNR, XLR)
+SFK = (TSH, VJM)
+KTT = (TFL, TPL)
+MVV = (NBL, CBX)
+LVR = (NCH, SGM)
+BDK = (THX, PXM)
+HRN = (QQC, QQC)
+LFR = (CNS, LBC)
+CHN = (QLV, HPT)
+RHH = (PPJ, RHX)
+XJB = (JBK, RMR)
+FXC = (KMQ, FNN)
+RQC = (XXS, LGS)
+CGL = (RTK, LVN)
+SQV = (FRV, QNP)
+GXN = (RRF, CXL)
+FPR = (XDB, PTF)
+DDV = (VCB, MKK)
+BTC = (PQK, BQH)
+GDP = (MBH, FFP)
+PDF = (GJF, HST)
+SQM = (QFG, TKV)
+VLC = (MBH, FFP)
+PJS = (RDP, STC)
+RFM = (RVL, BTC)
+PTF = (TSB, NSM)
+MCF = (VJM, TSH)
+KCX = (HNH, VFH)
+GHV = (TJC, QPK)
+DDN = (QBF, CLT)
+DFR = (XKR, HNP)
+SXR = (XCH, SQV)
+GLQ = (KJM, CKR)
+DNJ = (SXR, XKT)
+QHD = (QBL, NKN)
+NHB = (VPR, KVD)
+SDR = (GVJ, FSR)
+CRK = (JGX, QKD)
+SJR = (HXV, LMC)
+FQC = (VKS, PRF)
+SLT = (XCF, HNX)
+QTF = (TQH, JNP)
+VMX = (LGN, CCH)
+QFS = (STC, RDP)
+FCX = (QSL, DJF)
+DFS = (VLC, GDP)
+LHC = (TNR, HMK)
+HBQ = (KCH, SDR)
+TRT = (QPT, QLG)
+QLV = (FJQ, BVS)
+FKB = (NGG, VLT)
+HST = (KTS, LCH)
+BBK = (BVJ, BNM)
+JQX = (SPK, MFB)
+TBK = (SKJ, TDH)
+CSD = (SDC, TNQ)
+SHN = (QPK, TJC)
+HQT = (NPV, CTP)
+TJC = (KXM, JBH)
+FDP = (FVR, HHX)
+QDR = (BFT, QGP)
+AAA = (MHM, LFM)
+GTD = (JXM, KMZ)
+TRN = (LTJ, FTV)
+TMF = (QGN, FTS)
+LVQ = (MRK, JHM)
+PNX = (XMN, LPB)
+KCB = (TNR, HMK)
+FJQ = (PNX, BHQ)
+TGB = (LGS, XXS)
+SSP = (QRR, MRZ)
+GGG = (BMB, NFQ)
+FNH = (STQ, JKL)
+LFD = (SJT, FNH)
+LLX = (JHS, GQC)
+BQS = (QPT, QLG)
+QJK = (RHK, VFQ)
+SBK = (MBM, DTT)
+QVL = (QHV, CMB)
+QQC = (GQQ, GQQ)
+HNX = (DNJ, XCP)
+BXM = (QSJ, BLR)
+TNR = (VNX, XRC)
+SHR = (XRP, JCX)
+VGM = (BQS, TRT)
+BSR = (VVT, GNH)
+LCH = (RJC, NKH)
+FVT = (SKT, JLX)
+HGG = (KNH, GKT)
+HVF = (XVP, HQR)
+JSS = (SBK, XGH)
+TKF = (VSG, CJN)
+XCF = (XCP, DNJ)
+MCK = (RTL, KRN)
+DGP = (LDT, TLC)
+FSR = (JNT, QKQ)
+JCX = (KTT, BKX)
+MGN = (PDF, HCB)
+BQC = (BLR, QSJ)
+KMD = (NPR, NDP)
+QCK = (XBX, TBS)
+GFC = (HCQ, SHT)
+JXM = (XLR, VNR)
+XKT = (XCH, SQV)
+THN = (SGV, JDB)
+XCP = (SXR, XKT)
+NHG = (JBC, KHX)
+HXP = (PPJ, RHX)
+NHJ = (TNP, SHH)
+QTL = (NGG, VLT)
+XVP = (SVC, SVC)
+FNR = (GVN, SVX)
+MDN = (MVV, DRB)
+LTR = (RRT, MKB)
+KSS = (BGT, MNM)
+SBV = (HLV, SSX)
+MXN = (PJB, XLM)
+MTG = (QHV, CMB)
+MLT = (TDJ, XNL)
+TSC = (DNQ, FFK)
+VCB = (FRD, MCS)
+CNT = (HGG, DCX)
+SSQ = (XVP, HQR)
+XKR = (VRM, DHN)
+BLK = (QBD, SSF)
+HPJ = (BDQ, QQK)
+JPM = (NNN, HPJ)
+KPH = (XNF, TXM)
+LDS = (GMG, ZZZ)
+LQN = (GQQ, PMT)
+HRK = (BJG, GMN)
+BGH = (KCV, FXP)
+BVJ = (SXK, SXM)
+GDB = (PSL, QBH)
+GPN = (BKS, DFX)
+RTL = (HFG, DTH)
+TMM = (KFD, QTF)
+GSK = (HRN, VKG)
+VKG = (QQC, LQN)
+RMX = (BDK, MCM)
+CBT = (GQC, JHS)
+RHD = (LBV, LBV)
+NMP = (GXQ, HLL)
+MRZ = (DMP, TJT)
+XMR = (SFM, LFG)
+QBH = (TCM, XMQ)
+PMJ = (FDP, QBR)
+QKQ = (MQC, XMR)
+JDB = (BCL, GTD)
+RCX = (VMR, TXX)
+LJR = (TMF, PNB)
+JVZ = (HFP, FRS)
+DRD = (JGQ, QDQ)
+SVM = (NPS, SMD)
+FTV = (KGH, QTD)
+QDH = (QRR, QRR)
+BCP = (RCV, NFM)
+DCT = (KFD, QTF)
+PVM = (JVR, FSF)
+SGM = (BBK, KPT)
+GQQ = (KLV, KLV)
+PJR = (RMN, JTD)
+VKS = (TKF, CNF)
+NKS = (DRP, SQM)
+JQS = (FSP, GLG)
+RRH = (LKS, JPM)
+SJG = (QBD, SSF)
+QSR = (NHX, CHN)
+SCN = (RCX, MQJ)
+NQS = (XBX, TBS)
+GLG = (LXP, RKL)
+QTD = (RCM, KVH)
+XFT = (TXM, XNF)
+DTH = (GGV, QKK)
+FSP = (LXP, RKL)
+JVK = (HBK, RMP)
+SPK = (CFL, PBB)
+NQF = (NFQ, BMB)
+KQV = (CJS, RVR)
+SGQ = (TGR, CXH)
+DXD = (BKS, DFX)
+KGH = (RCM, KVH)
+LBB = (RHD, RHD)
+RHX = (XVR, QTS)
+JHS = (SJR, CLL)
+SGC = (LFB, GXN)
+RQJ = (FNX, FNX)
+SHT = (QXF, MDN)
+THB = (JGQ, QDQ)
+RMR = (LBB, JST)
+RDM = (LHL, THF)
+JTS = (SSQ, HVF)
+RPJ = (FRP, MTF)
+QCT = (MNH, BNL)
+XLR = (TKS, LQR)
+VRT = (NHB, DCV)
+LDH = (FDP, QBR)
+SNP = (MLQ, LNT)
+FKR = (GLG, FSP)
+QLG = (QTT, SRM)
+VXB = (RPJ, PLT)
+LFP = (TGB, RQC)
+NDN = (LFR, SPS)
+TXT = (KRN, RTL)
+NSL = (HJT, TFN)
+QQK = (BCP, LNN)
+CJN = (MNF, LFD)
+PNB = (QGN, FTS)
+SPS = (CNS, LBC)
+XMB = (NPR, NDP)
+VJM = (LDP, QMD)
+MRQ = (SJQ, NDQ)
+MCH = (VLC, GDP)
+KLV = (FRS, HFP)
+HDJ = (DDR, RMX)
+LMH = (FJV, NVT)
+PTB = (QBF, CLT)
+MVD = (KSM, JKC)
+VXF = (KCV, FXP)
+HXV = (CRR, XLC)
+QJJ = (GSG, CQB)
+VMR = (DMS, DFR)
+TJT = (SDM, VKK)
+LNJ = (JLF, BNV)
+SVC = (QDH, QDH)
+VSG = (MNF, LFD)
+BFT = (DLQ, MXH)
+RJC = (KXH, DNV)
+FRV = (RQR, XPH)
+BNM = (SXK, SXM)
+LFM = (SLG, JQX)
+MSK = (CCH, LGN)
+JNT = (MQC, XMR)
+DHN = (LXC, QJJ)
+QTT = (STJ, HLR)
+QDP = (CVP, QBX)
+HPN = (THM, LDS)
+HNP = (DHN, VRM)
+NKH = (DNV, KXH)
+VHV = (HBQ, CND)
+CJF = (FKD, VMM)
+MKX = (VJS, RDM)
+CHD = (LFB, GXN)
+BKX = (TFL, TPL)
+DCG = (KTH, LXS)
+LTJ = (QTD, KGH)
+PQA = (FFL, KHB)
+GKR = (CTP, NPV)
+DSP = (QJP, GBK)
+XRC = (HQT, GKR)
+FJG = (PJS, QFS)
+XCC = (SJG, BLK)
+LKS = (HPJ, NNN)
+DPG = (NLX, KQV)
+PSL = (XMQ, TCM)
+NGV = (QBH, PSL)
+RMN = (GHT, BQP)
+NQM = (NQN, HDJ)
+CQB = (HMC, XLL)
+QJV = (RJD, SGR)
+MNM = (DGX, MGN)
+VQR = (JBK, RMR)
+XCH = (QNP, FRV)
+HCQ = (MDN, QXF)
+HJT = (RPB, JTM)
+VMJ = (SGM, NCH)
+DNV = (FPR, GTC)
+LGN = (JGS, MTJ)
+TQC = (DRD, THB)
+JFQ = (LTJ, FTV)
+JGS = (BDB, KKQ)
+RKL = (NVL, LNJ)
+CLR = (DSP, MXS)
+CQA = (MRQ, FGM)
+HQR = (SVC, JLD)
+DMP = (VKK, SDM)
+QSJ = (NTL, LTR)
+GDL = (KBV, CFJ)
+FTS = (MTG, QVL)
+DCV = (KVD, VPR)
+TRX = (PJS, QFS)
+KTK = (PJB, XLM)
+XMJ = (TTH, BSR)
+HBK = (MLT, XMV)
+CHL = (JNC, VGM)
+QQF = (CND, HBQ)
+DFX = (SLX, XCC)
+LJQ = (VXC, SNP)
+TXM = (NHG, TPR)
+NHX = (HPT, QLV)
+GJF = (KTS, LCH)
+LNN = (NFM, RCV)
+DXH = (NLX, KQV)
+SXK = (NTG, NDD)
+CXH = (MPG, TVP)
+PHM = (LJR, QXX)
+CND = (KCH, SDR)
+MSG = (CBH, NKS)
+RQR = (SXH, BVX)
+GHT = (QQL, BVH)
+GTK = (VFQ, RHK)
+NDQ = (NQF, GGG)
+CVC = (SGV, SGV)
+NGG = (GPN, DXD)
+PBB = (CLR, GTN)
+JLT = (QSR, KDJ)
+MBH = (JNV, QPG)
+JTD = (GHT, BQP)
+LBV = (FFL, KHB)
+XXS = (VXF, BGH)
+GMH = (GGS, KLG)
--- a/2023/gareth/day09/day09.go
+++ b/2023/gareth/day09/day09.go
@@ -0,0 +1,80 @@
+package day09
+
+import (
+	"strconv"
+	"strings"
+)
+
+func Part1(input string) int {
+	lines := strings.Split(input, "\r\n")
+	total := 0
+	for _, line := range lines {
+		var intSeq []int
+		seq := strings.Split(line, " ")
+		for _, i := range seq {
+			num, _ := strconv.Atoi(i)
+			intSeq = append(intSeq, num)
+		}
+		total += extrapolate1(intSeq)
+	}
+	return total
+}
+
+func Part2(input string) int {
+	lines := strings.Split(input, "\r\n")
+	total := 0
+	for _, line := range lines {
+		var intSeq []int
+		seq := strings.Split(line, " ")
+		for _, i := range seq {
+			num, _ := strconv.Atoi(i)
+			intSeq = append(intSeq, num)
+		}
+		total += extrapolate2(intSeq)
+	}
+	return total
+}
+
+func extrapolate1(array []int) int {
+	allZeros := true
+	for _, x := range array {
+		if x != 0 {
+			allZeros = false
+			break
+		}
+	}
+
+	if allZeros {
+		return 0
+	}
+
+	deltas := make([]int, len(array)-1)
+	for i := 0; i < len(array)-1; i++ {
+		deltas[i] = array[i+1] - array[i]
+	}
+
+	diff := extrapolate1(deltas)
+	return array[len(array)-1] + diff
+}
+
+func extrapolate2(array []int) int {
+	allZeros := true
+	for _, x := range array {
+		if x != 0 {
+			allZeros = false
+			break
+		}
+	}
+
+	if allZeros {
+		return 0
+	}
+
+	deltas := make([]int, len(array)-1)
+	for i := 0; i < len(array)-1; i++ {
+		deltas[i] = array[i+1] - array[i]
+	}
+
+	diff := extrapolate2(deltas)
+	return array[0] - diff
+}
--- a/2023/gareth/day09/day09_test.go
+++ b/2023/gareth/day09/day09_test.go
@@ -0,0 +1,18 @@
+package day09
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+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`)
+	assert.Equal(t, 114, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`10 13 16 21 30 45`)
+	assert.Equal(t, 5, r)
+}
--- a/2023/gareth/day09/input.txt
+++ b/2023/gareth/day09/input.txt
@@ -0,0 +1,200 @@
+-7 4 41 121 272 539 997 1790 3238 6096 12113 25120 52964 110690 225447 443645 840883 1535008 2702137 4594155 7553340
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--- a/2023/gareth/template/day09.go
+++ b/2023/gareth/template/day09.go
@@ -0,0 +1,18 @@
+package day09
+
+import (
+	"fmt"
+	"strings"
+)
+
+func Part1(input string) int {
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		fmt.Println(line)
+	}
+	return -1
+}
+
+func Part2(input string) int {
+	return -2
+}
--- a/2023/gareth/template/day09_test.go
+++ b/2023/gareth/template/day09_test.go
@@ -0,0 +1,25 @@
+package day09
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestPart1(t *testing.T) {
+	r := Part1(`AAA = (BBB, BBB)
+BBB = (AAA, ZZZ)
+ZZZ = (ZZZ, ZZZ)`)
+	assert.Equal(t, 6, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`11A = (11B, XXX)
+11B = (XXX, 11Z)
+11Z = (11B, XXX)
+22A = (22B, XXX)
+22B = (22C, 22C)
+22C = (22Z, 22Z)
+22Z = (22B, 22B)
+XXX = (XXX, XXX)`)
+	assert.Equal(t, 6, r)
+}
--- a/2023/gareth/template/input.txt
+++ b/2023/gareth/template/input.txt
@@ -0,0 +1,200 @@
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--- a/2023/gareth/utils/grid2d/grid2d.go
+++ b/2023/gareth/utils/grid2d/grid2d.go
@@ -1,74 +1,74 @@
-package grid2d
-
-import (
-	"strings"
-
-	"adventofcode2022/utils"
-)
-
-type Grid[T any] struct {
-	sizeX, sizeY int
-	matrix       [][]T
-	empty        T
-}
-
-func NewGrid[T any](sizeX, sizeY int, empty T) *Grid[T] {
-	matrix := make([][]T, sizeY)
-	rows := make([]T, sizeX*sizeY)
-	for i := 0; i < sizeX*sizeY; i++ {
-		rows[i] = empty
-	}
-
-	j := 0
-	for i := 0; i < sizeY; i++ {
-		matrix[i] = rows[j : j+sizeX : j+sizeX]
-		j += sizeX
-	}
-	return &Grid[T]{
-		sizeX:  sizeX,
-		sizeY:  sizeY,
-		matrix: matrix,
-		empty:  empty,
-	}
-}
-
-func (g *Grid[T]) SizeX() int {
-	return g.sizeX
-}
-
-func (g *Grid[T]) SizeY() int {
-	return g.sizeY
-}
-
-func (g *Grid[T]) Get(x, y int) T {
-	if x < 0 || x >= g.sizeX {
-		return g.empty
-	}
-	if y < 0 || y >= g.sizeY {
-		return g.empty
-	}
-	return g.matrix[y][x]
-}
-
-func (g *Grid[T]) Set(x, y int, v T) {
-	if x < 0 || x >= g.sizeX {
-		panic("invalid x")
-	}
-	if y < 0 || y >= g.sizeY {
-		panic("invalid y")
-	}
-	g.matrix[y][x] = v
-}
-
-func (g *Grid[T]) StringWithFormatter(formatter func(T, int, int) string) string {
-	var r strings.Builder
-	for j := 0; j < g.sizeY; j++ {
-		for i := 0; i < g.sizeX; i++ {
-			_, err := r.WriteString(formatter(g.matrix[j][i], i, j))
-			utils.PanicOnErr(err)
-		}
-		_, err := r.WriteRune('\n')
-		utils.PanicOnErr(err)
-	}
-	return r.String()
-}
+package grid2d
+
+import (
+	"strings"
+
+	"awesomeProject/utils"
+)
+
+type Grid[T any] struct {
+	sizeX, sizeY int
+	matrix       [][]T
+	empty        T
+}
+
+func NewGrid[T any](sizeX, sizeY int, empty T) *Grid[T] {
+	matrix := make([][]T, sizeY)
+	rows := make([]T, sizeX*sizeY)
+	for i := 0; i < sizeX*sizeY; i++ {
+		rows[i] = empty
+	}
+
+	j := 0
+	for i := 0; i < sizeY; i++ {
+		matrix[i] = rows[j : j+sizeX : j+sizeX]
+		j += sizeX
+	}
+	return &Grid[T]{
+		sizeX:  sizeX,
+		sizeY:  sizeY,
+		matrix: matrix,
+		empty:  empty,
+	}
+}
+
+func (g *Grid[T]) SizeX() int {
+	return g.sizeX
+}
+
+func (g *Grid[T]) SizeY() int {
+	return g.sizeY
+}
+
+func (g *Grid[T]) Get(x, y int) T {
+	if x < 0 || x >= g.sizeX {
+		return g.empty
+	}
+	if y < 0 || y >= g.sizeY {
+		return g.empty
+	}
+	return g.matrix[y][x]
+}
+
+func (g *Grid[T]) Set(x, y int, v T) {
+	if x < 0 || x >= g.sizeX {
+		panic("invalid x")
+	}
+	if y < 0 || y >= g.sizeY {
+		panic("invalid y")
+	}
+	g.matrix[y][x] = v
+}
+
+func (g *Grid[T]) StringWithFormatter(formatter func(T, int, int) string) string {
+	var r strings.Builder
+	for j := 0; j < g.sizeY; j++ {
+		for i := 0; i < g.sizeX; i++ {
+			_, err := r.WriteString(formatter(g.matrix[j][i], i, j))
+			utils.PanicOnErr(err)
+		}
+		_, err := r.WriteRune('\n')
+		utils.PanicOnErr(err)
+	}
+	return r.String()
+}
--- a/2023/gareth/utils/inputs/inputs.go
+++ b/2023/gareth/utils/inputs/inputs.go
@@ -1,45 +1,45 @@
-package inputs
-
-import (
-	"strings"
-
-	"adventofcode2022/utils"
-	"adventofcode2022/utils/grid2d"
-	sparsegrid "adventofcode2022/utils/sparseGrid"
-)
-
-func ToInts(input string, sep string) []int {
-	var r []int
-	for _, line := range strings.Split(input, sep) {
-		if line != "" {
-			r = append(r, utils.MustAtoi(line))
-		}
-	}
-	return r
-}
-
-func ToGrid2D[T any](input, rowSep, colSep string, empty T, conv func(string) T) *grid2d.Grid[T] {
-	lines := strings.Split(input, rowSep)
-
-	grid := grid2d.NewGrid(len(lines[0]), len(lines), empty)
-	for y, line := range lines {
-		for x, v := range strings.Split(line, colSep) {
-			grid.Set(x, y, conv(v))
-		}
-	}
-
-	return grid
-}
-
-func ToSparseGrid[T comparable](input, rowSep, colSep string, empty T, conv func(string) T) *sparsegrid.SparseGrid[T] {
-	lines := strings.Split(input, rowSep)
-
-	grid := sparsegrid.NewGrid(empty)
-	for y, line := range lines {
-		for x, v := range strings.Split(line, colSep) {
-			grid.Set(x, y, conv(v))
-		}
-	}
-
-	return grid
-}
+package inputs
+
+import (
+	"strings"
+
+	"awesomeProject/utils"
+	"awesomeProject/utils/grid2d"
+	sparsegrid "awesomeProject/utils/sparseGrid"
+)
+
+func ToInts(input string, sep string) []int {
+	var r []int
+	for _, line := range strings.Split(input, sep) {
+		if line != "" {
+			r = append(r, utils.MustAtoi(line))
+		}
+	}
+	return r
+}
+
+func ToGrid2D[T any](input, rowSep, colSep string, empty T, conv func(string) T) *grid2d.Grid[T] {
+	lines := strings.Split(input, rowSep)
+
+	grid := grid2d.NewGrid(len(lines[0]), len(lines), empty)
+	for y, line := range lines {
+		for x, v := range strings.Split(line, colSep) {
+			grid.Set(x, y, conv(v))
+		}
+	}
+
+	return grid
+}
+
+func ToSparseGrid[T comparable](input, rowSep, colSep string, empty T, conv func(string) T) *sparsegrid.SparseGrid[T] {
+	lines := strings.Split(input, rowSep)
+
+	grid := sparsegrid.NewGrid(empty)
+	for y, line := range lines {
+		for x, v := range strings.Split(line, colSep) {
+			grid.Set(x, y, conv(v))
+		}
+	}
+
+	return grid
+}
--- a/2023/go/.vscode/launch.json
+++ b/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}"
+        }
+    ]
+}
--- a/2023/go/day08/day08.go
+++ b/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
+				}
+			}
+		}
+	}
+}
--- a/2023/go/day08/day08_test.go
+++ b/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)
+}
--- a/2023/go/day08/input.txt
+++ b/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)
--- a/2023/go/day09/day09.go
+++ b/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
+}
--- a/2023/go/day09/day09_test.go
+++ b/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)
+}
--- a/2023/go/day09/input.txt
+++ b/2023/go/day09/input.txt
@@ -0,0 +1,200 @@
+12 20 25 35 64 137 305 670 1420 2874 5537 10165 17840 30055 48809 76712 117100 174160 253065 360119 502912
+4 13 35 72 138 283 626 1388 2906 5608 9961 16503 26276 42338 73621 143357 305888 678423 1499107 3231106 6746590
+-6 -9 -13 -18 -24 -31 -39 -48 -58 -69 -81 -94 -108 -123 -139 -156 -174 -193 -213 -234 -256
+18 36 73 131 225 404 773 1526 3020 5945 11675 22920 44839 86819 165175 307081 556102 979762 1679653 2804665 4567997
+17 31 46 67 109 199 385 775 1650 3729 8722 20406 46627 102917 218904 449526 894459 1731467 3273058 6061549 11026301
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+-6 -2 12 37 85 189 422 952 2183 5066 11718 26576 58470 124296 255549 510096 993680 1899506 3581116 6685619 12394363
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--- a/2023/go/day10/day10.go
+++ b/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{}
+}
--- a/2023/go/day10/day10_test.go
+++ b/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)
+}
--- a/2023/go/day10/input.txt
+++ b/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
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--- a/2023/go/day11/day11.go
+++ b/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
+}
--- a/2023/go/day11/day11_test.go
+++ b/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)
+}
--- a/2023/go/day11/input.txt
+++ b/2023/go/day11/input.txt
@@ -0,0 +1,140 @@
+.......#...........................................................................#........................................................
+.............#...........#..................#.............................................................#..............#.......#..........
+..................................................................#.........#......................................#........................
+.................#...........................................................................................................#..............
+.............................................................#..............................................................................
+......................#.....................................................................#............................................#..
+.....#...........................................#..........................................................................................
+............................#..........................................#...............................#....................................
+...........#......................................................................................#......................#..................
+....................................................#.....#................................................#......................#.........
+#..................................................................#.............#...........................................#..............
+......................................#..................................................#...............................................#..
+.................................#..........................................................................................................
+...............#........#..............................................#...............................................#....................
+.......#....................................................................................................................................
+............................................................................#...................#..................#.......#.........#......
+...................#......................#......#.......#.......#..........................................................................
+............#...........................................................................#................#..................................
+.....................................................#..................#................................................................#..
+.............................#.....#..........................................................................#...................#.........
+...#.......................................................#...............................#................................................
+............................................#........................................................#......................................
+...................................................................#..................................................................#.....
+..........................................................................................................................#.................
+#.......................#............................#.......................................#..............................................
+..........................................#.................#.....................................#................................#........
+..................#............................................................#........................#..............#....................
+............................................................................................................................................
+......#........................................................................................#.............................#..............
+...............#........................#.........#.....#......#...................#..............................#.........................
+.........................#.....#..........................................#.................................................................
+.................................................................................................................................#..........
+...........................................................#..................................................#..........#............#.....
+.............#.................................................................#............................................................
+.....................#............#..............#.......................................#..................................................
+#..........................#...........................#..................................................#.................................
+.............................................................#....................................................................#.......#.
+......................................................................................................................#.....................
+............#..................#...........#........#...............................#..............#...........#............................
+.......#..............................#.....................................................................................................
+........................#...............................................................#..............#.................#.............#....
+.#..........................................................................................................#...............................
+.........................................................#.....................#.................................................#..........
+..........................................#..........................................#...........................#.........................#
+.....#..........................#.................#..........#........#.....................................................................
+..........#...........#.................................................................................#...................................
+.............................................................................................................................#.......#......
+..........................................................#.................#............#..................................................
+.....................................................#..........................................#...........#...............................
+.......................................#...............................#.............................#......................................
+..................................#...............................................#........................................#.............#..
+.......#.......#.......#..........................................#.........................................................................
+.............................................#...............#..............................................................................
+............................#................................................................#..............................................
+........................................................#..................#.............................#........................#.........
+...................................................................................................#..........#.............................
+......#............................................................................#....................................#..................#
+..................#.....#...............#.....#......#...................................#.....................................#............
+..................................................................#...........#.............................................................
+#.............#..........................................#...............#...................#.........#....................................
+........#.............................................................................................................#.............#.......
+......................#......................................#............................................................................#.
+..............................#....................................................#........................................................
+............................................................................................................................................
+...............#.............................................................................................#..............................
+........................#............#............................#................................................................#........
+...#.....................................................#................#..............#...................................#..............
+.............................................#..............................................................................................
+...........................#................................................................................................................
+.....................................................#......#....................................................#.....#....................
+.....#....................................#.....#...........................#...................#...........................................
+..............#.....................#...................................................................#...................................
+#........................................................................................#..................................................
+.....................#........................................................................................#.............................
+..........................#.......................#..................................................................................#......
+.........#................................................#.........#.......................................................#...............
+...............................#................................................................#.....#.....................................
+...................#..........................#.................#..................#..............................................#.........
+......#......#..............................................................................................................................
+............................#......................................................................#........#...............................
+....................................................................................................................#.......................
+................................................#...........#.................#........................#....................................
+.................#..........................................................................................................................
+..........................#......................................................................................#..........#..........#....
+#...............................................................................................#.....................#.....................
+............#......................#...................#.................................#.........................................#........
+............................................................................................................................................
+....................................................................#.......................................................................
+.....#........................................#...........................................................#...................#.............
+..........................................................#..................................#..............................................
+.............................#............................................#.................................................................
+......................#............................................................................................................#........
+..#.....................................................................................................................................#...
+...........#..........................#............................................................................#........................
+..............................................#.................#....................#...............#........#.............................
+...........................#...........................#......................................#...........................#.....#...........
+.........................................................................................................#..................................
+.........#......#................................................................................................#........................#.
+...#.....................................................................#..............#...................................................
+.............................#......#...............................#................................................#......................
+.........................................#............................................................................................#.....
+.....................#............................#............#.................#...........................#...............#..............
+.............#..........................................#...................................#...............................................
+..#.............................#...........................................#.....................#................#........................
+...........................................#...........................#.................................................#..............#...
+........#...........................#.......................#.......................#.......................................................
+...........................#.............................................................................#.......................#..........
+............................................................................................................................................
+...............#...............................................................................#..........................................#.
+............................................................................................................................................
+#...............................................#......#.......#...............#............................................................
+.........#.................................#...........................................................#....................................
+......................................#............................#...............................................#........................
+......................#.........#.............................................................................#.............................
+....................................................................................#............#..........................................
+..........................................................................#...............#.................................................
+...........#.....#................................#.........................................................................#...............
+..................................................................#.......................................#.........................#.......
+.........................#................................#........................................................#........................
+........#...................................................................................#......#....................................#...
+...............................................................#...............#............................................................
+.............................................#.........................#.....................................#..............................
+...................#...............#........................................................................................................
+..........................#..............................#....................................#..................................#..........
+...........#.....................................................................#.....#....................................................
+...#.................................................#...............................................#...........#...........#..............
+...............#........................#................................................................................................#..
+....................#..............................................#.....................................#..................................
+..................................#.....................#................................#..................................................
+............................................#...................................................#.............#.............................
+........................................................................................................................#.....#......#.....#
+...........................................................#..................#......................#......................................
+...................#.........#....................................#.........................#...............................................
+....................................................#...............................................................#.......................
+.............#........................#....................................................................................#................
+....................................................................................#...................................................#...
+.......#................................................#................#..................................................................
+.#.................................................................#..............................................................#.........
+...................#.....#...................................................................#.........#.........#..........................
+............................................#.....#............#..................................#.........#................#..............
--- a/2023/go/day12/day12.go
+++ b/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)
+}
--- a/2023/go/day12/day12_test.go
+++ b/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)
+}
--- a/2023/go/day12/input.txt
+++ b/2023/go/day12/input.txt
--- a/2023/go/day13/day13.go
+++ b/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
+}
--- a/2023/go/day13/day13_test.go
+++ b/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)
+}
--- a/2023/go/day13/input.txt
+++ b/2023/go/day13/input.txt
--- a/2023/go/day13b/day13.go
+++ b/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
+}
--- a/2023/go/day13b/day13_test.go
+++ b/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)
+}
--- a/2023/go/day13b/input.txt
+++ b/2023/go/day13b/input.txt
--- a/2023/go/day14/day14.go
+++ b/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
+}
--- a/2023/go/day14/day14_test.go
+++ b/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)
+}
--- a/2023/go/day14/input.txt
+++ b/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
+......O.O.O.....O.#.#.#OO#O#.O...O.#.......#O....#.O.#....OOO...#....O#O.......#......O...O##...O...
+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.
+#.O....#.O..#O...#...#...O....OOO.#O.#.#..#.....#.#..OO..#OO.......#OO.OOO....O.#O.#.O......####..O.
+OOOO...#.OO.#....O...O.O...##....#OO...O.##.O.....###..O........OO..O.O.......#.#...O..#..O.#..O....
+OOO..##....O...O.....O#..O.O.#..O..#.#.#..O........O..#OOO.....#....O#OO.#.#.....O..#..O...O..O.#OO#
+...##.#.##.#O....O#..O..O.........#.#.#O...O.......O...O#..OOOO....O...O.OO#.O.##...#....O..O.......
+....##.###OOO.O...#.......OO....OOO....O.OO#..O.#..OO....OO......O..OO...OOO.OO#...#..OOO..O.###O...
+O###O.....O.O.#O#.O.O#O.O###.....O..O........#....#..O#..#.#..O...........#......#OO........O..O####
+.#.#.OOO.O.......#O..O.#..O.OO.OO.O..O.#.#...O.O.OO..##..O...#...#O#..O.........O.O..O.O#....O..#O..
+.#..#O.#O..#.O.O.O...#OO....#...O....O..O.O...#..#.##O.O..O..#O.....OO##...O#.......O#O.#..........#
+#O...#.#OO.O...#O...O...#.#.O#..#.O#.###.#......O..O....#..#.OO..#....O..O.O....#.O.O.O.#..O..OOO..O
+O.....#...#.#OOO.OOOO..#O.O.#...O.##..OO..#O...#.....OO#..#.#...O##OO...O.....O..#...#...........O.O
+.##.O#.O..#O#.O##.O.#.........##.O......#OO...OO.......#...#O.O#...O..#.#...O..#...#O...O.#....OO.OO
+.O#OO.O..#...#..O..O...##.O....###O.....O...#.#OOO...OO...O.......#.#.#.OO....#OO.#..O..........OO..
+.....#OO.O..O.O.O...O.O#.#.O...O..#...O##.......#......#O...#.#.#....#..O.O..#..........O..#.#..#O..
+...O.O.O.OO...O#..O..OO..O#.#.O.#OO..O.O..OO..O#...#.O#...O.......#..#..O..##..O..#O......O.OO...O.O
+#.O....O.O.#...O.....O.....O#......#.#..OO...#.....O.#.#.O...#.#....#....O#.O.#......#OOO.O...O#....
+...OOO......#..O..O#.......#....O#OO..#O.#.#...#...O.O..OO..#.O...O..#.....OO..O..#...#.O...O#..O.OO
+#OO.OO#.OOO...##............O....O.O..#.##.#.O.........##...#O.O..#................#..O.O.O#O.O#..##
+.O.O.O##..#O.O#O...##.#OO#...#.OO#..O...O#...O....O#..OO....O....#...O...#OO.OO#O....#..O..#OO....O.
+.OO.#.......#...O...OO..#..OO.O.O.OO#O.O.O...O....O#..#.O.........O..#.O...#.#...O.O......O........O
+.O....##..#....#.....O.#...O.O.#....#....OOOO...O.O###.O........O.....O.O..#.##OOO.O.......#.#.O..O.
+.#.....O...#.O...#........#...#....#OO.O...O#O........OOO...#.O....OOO#.O.....OO....#.#...#..OO..#..
+OO.OO...O..#..#O....O.O....OOOOO.#O.#O.O...#.O....O#.O.O.#O.#...#..O...O.#O.O.#..O....OOO......#.O#.
+.O##..OO.....#.OO..#..O..#...#.#........O..OO...#O..O....#..O..O#.....O#..##O..O#.##.#...#.O..O.O.O.
+..#...#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#
+#...#.O....OO......#O...#O..O#..#O#O.#..#.....OO....OO#..#O....O.O..#.O.#.....O#.O.OO..O#.O.O..O.O#.
+OO....OO......#O........#O...#.#..O##....O#..#.#O.O.#....O..O..O.O....O.......#..OOO#.........O....O
+O.....#O.OO##......#O##..O..O...##..O..........O..OO.O..#O....O..OOO#OO.##..#....O#..#...O.O.O...O..
+.............#.#.#.O...#.#..#......O.#.O..#....#..##....#.##.##.#.O...O.O..#.#.#...OO....O..#O..#..O
+.O.#.....O.O..O..##O...OO.#.O....#..#.#...O.O#...#O.O.OO...O..#..OO...O...O...O.....#.O..O#..#.#..OO
+.....O..OO......#.#.#.O.##.OO...O..O.#..#...#OO....OOO......O.OO.#.O..O#O...O.#......OO##O.O.#O..O..
+O##O.#.#..#..OO.O.........#O.#..O.#.##.O#..OOOO..#....O...O.........O..O..###...O...O.#.....O..##.O.
+..O...#O#O.O...O.#..#O.......OO...........#...#..##.O......#..O.O.#OO.OO.#O....#.O.....O..#..#.#..#.
+O#..O..##O#....O..OOO..OO...#O..O.O...O#O...OO.O##.O#O..#......OO##O.##...OOO.O..#....O##O..#......#
+..#O...O..O.O...#..O.O...#O.....O.O......##OO#..O......#..O.#.O......OO.#O........O.....OO...O...O.O
+........OO.#.OO..O......#...#...#..OOOO.OO.#....O.OO...O.##.....O.O....#O.#.OO..##.##..#.#O#.OO...O#
+....#......#O.OO.....OOO....OO..O.O.O....##..O..O.O#.O....O.#O.#O.....O..O........#O.....O.O.....O#.
+#.O#.O#......##.....O.#O...###...##....#O#.#.#....OO...O..#.O....O..#..#..O..........O......#.O.O...
+.O.#..O#.OO....O.#...#O....#....OO......#O.O..#O..........O.#..#...#OOO........#.#.........O.#..O...
+#OO.OO..O..O.O.#O.O.....O.##..#.O#..#.O....#........#.OOO#.#.....#.#.......O#..##..#.OO....O#O#.....
+.......#O.O....#.OOO..OO...O...#....O..#.#....OO..O....O.#.O.#O#..O#.#.O..O......##...OO..#....O.#..
+.O..O#.#OO.O.O.O.##...O..O.O..O.##O...#.O..O..O..O..O.....O...#..OO#O..O###...#...#....O##.OO...#...
+#O....#...##..O..#...#OO.O.O.#......O...O.#.#O..O...O....OOO..O.O..O...O.OO...O...#..O....O#.###....
+....#..O.....##.O.......##.##..OOO.O.#.#.....#....O..#..O....#....O...#.O..O#..O##...#.##....O.#OO##
+O....O...OO.O........#..O...#..#.....O......O.O.OO.OO..#....O..O.............##.O.....##O#.OOO......
+........#.O.####O.OO.#.O..O.O.#.#....OO#.......O..#....##.OOO..O.O.O..#.O.#...O.O.O..O.##O..O#....O.
+...#....#.....O....O.O.O##.O..#O.OO...#.##.O..###OO##.O......#..##.OO...O.......O.......#..O.#.O..O.
+.O.O...O......OO.#....#O..O.O.O..OO.O..O##O...O....O..OO.#..O....O..#.O..OO.OO....O#O..#.O..#O...#.#
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+....OO.......###..O#.....O##..#O..#..#.O.....##.......##..O#O....#....#O.O..#..#..O.###O..#.O#......
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+.#...O.OO#O.O..O.##O..O#...##...O....OO.O#....#...#O.O#....O..........#....#............##.......#..
+.O.#........##O...#O..O..O....OO#O....#.O..OO.##..O..OO#.###OO.....#..#.......O.#.....OO........OO.#
+.OO...O.#..##.....OO..O.O.O.#.###.##.O.#..O..#..O..O...##.#......O....O.O.........O..#.O.O#O.#O...#.
+#..#.#..O...##.....OO#O.OOO.....#...#.....##.#...O....O....#..OO#.#.OO....#.....O.O...O#.#..#..O#O.O
+.O#.O.#..O..O#...OO...O...O#...O..O..#.O..#...O#.#....O......O#...O...OO.O##.#O....O....#OO....#O...
+OO..OOO.O......OO...OO#O...#.#.#O.OOO#....#.OO#.#.O.#......O.O.OO#..O..#..O.O#.O#.O....O..O...O.....
+...OO....O...#OO#..#..O.#O#....O.....OO.O.#.OO##.....#..O#.OO..#.#.O#..#..O.#..O....#....O.#O...OO#O
+..#.......OO..##.O#...O#....O.#.O..##..#O.......#O#......O..O.........O#..#OO..O..#O.#.#.O.O#.#OO#.O
+...#O#...O...OO...OO..OO...#OO...O...##.O....##.#O##.O....#..O#..O.....O.......###.#.OO#...O......#.
+.O.OO#O##O##...#..#....#..#O...O#..O.O##......#........#O.........#.O....O..#..O.....O..#......O.#.#
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+.OOO....#...O..O.....O..O...O...O..O...O#...#O....O.O...#..OO##.O.#..O..........O#..#..#..OO#.....#.
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+O#O.O.O#.#OO#..OO.O.#......#.....#.......##.O..#.O..#..OO..O.#.#.O.O.O#.#......O....####OO#.#O#OO.#.
+.#.....O#..O#O#..OO...#.O.#....#.#..##....O##....#.........##OO...##...O......#.OO...#O....O.O.O#O..
+O......#.O....O...O.....OO.#....#O.##....#.O.O...O..#...O....#.O....O.O....#.OO.#.......#...#..#...O
+...#OO..#......#..OO.O.O.##.O....O.##O##.OO#O.O.O..O.#O#O.OO...........O...###.#......O..#..#O#..OOO
+O..O.#..O.OO.O...OO.OO..OOOO....O...#....##.OO.O.....#.......O.O........O.#.......#.......#..#.O..O.
+.OO.##...#O..O#....O....#..O#....#.....O...O#.....OOO#.....................#..#..#..#O.......O.#OO..
+.#OO..O....O..#.....#O...OO.#....#.#.O...O.#........O...O..O..OO#..#.....#.......OOOOO.OO....O....O.
+.O#...#.......O.O...O.O.O#...OO.O#...O#O.O.#......#......O..O##.##.....O.....##...........O#...O....
+.#.O.O#.....O.#..OO......#O.#..O..O.O.O..#.#...O##.#O..OOO......#...#..OO...O.#.....#O.OOO...#.O..##
+.........O..##OO.#OOOO.O.O..OOO...OO.#.....#...O.#O##..O#..#.#..#...#..O.O...#OO.O...O...#O...#..#..
+.#.#O.#...#OO.O.........O#..O...OO#.....O....OOOO#.....O.O....#...O...........O#.#.O..O.#.O.#.O.#.#.
+......O.#...O.....O.O..O#...O.#........#.O...O.O....#..O#....O.#.O.O....O...#OO...#........OO..O.O.O
+....O.O..OO.....#...OOOO.O#............O#OO....OOOOOO..#..#O#..#.#.O.OO.#O.....O.#......##..O#..#O..
+..#......#...#O.#..#.#....OOO#...O.#....O..#O.....O.....O.O......O.......O.O..O..O.OO.O.#OO..O#...#.
+.O.#.O.OO..O#.O#OO..........O.......O..#..#.#..O...#...##.....####...#........##O.......#....#...O##
+........#.#.O.#O.......#O...O...#.#O..#OOO..#O..###...O.#.#O...O.O#..O..O...O.O....###.OO.#OO..O.#.O
+..#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.
+O#O..OO.O....OO.#O......O......#...#.....O.#OO.#.....OO..O#.O..O.O...#....O.O..OO.O....#....OO..O...
+...O.....##....#....#....#......O#O..OO.....OO#O.OO......#OO.......O.#..###OO...#.O..OO.#.O.O#OO..#.
+.O.#.O..#O.....#.#O....##OO.#O..##..##.##...#OO.O.#O#..O..O.O..O..##O.O.....O.OOO..#..#O..O#..OO...O
+..##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.#..###
+O.....O...#O.#..........#O......O..OOO#....O.OOOO....O..#..#O....O.....O#..O..#.O.O....#OO.#....#O..
--- a/2023/go/day15/day15.go
+++ b/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
+}
--- a/2023/go/day15/day15_test.go
+++ b/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)
+}
--- a/2023/go/day15/input.txt
+++ b/2023/go/day15/input.txt
--- a/2023/go/day16/__debug_bin946177999
+++ b/2023/go/day16/__debug_bin946177999
--- a/2023/go/day16/day16.go
+++ b/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
+}
--- a/2023/go/day16/day16.py
+++ b/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)
--- a/2023/go/day16/day16_test.go
+++ b/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)
+}
--- a/2023/go/day16/input.txt
+++ b/2023/go/day16/input.txt
@@ -0,0 +1,110 @@
+\.......................\..........................................-..................-.../................-..
+....../.......\...-......-.|...\..............\.................|............././....-........................
+...............-...-........................................\......\..-.............|......-....\....-........
+..\..|.|...........................-.|........................................./.|....|................|......
+|../................|............................................................\........../..\..............
+........\............../................/..........................\...\....|............./....-.........\\...
+.................-...-...................\../........-|.................../......-...........|................
+........-............/...|-............-.....\.|..............-....-../\../..................\...\././........
+........................-|................................................................-........-..........
+-......./.................|.....\.................\.....//............-........./..../....|...................
+....-.............-........-..........-|.......|...../...\...................\.....................|..........
+...|...\.........|.................|.....|....-....\.......\./........................-.../..../.....-........
+....|....-.-..............\.........|.......................-.......-..............\................/.........
+.....|.\...........-.................-.-........../...\............|...............|...|......./.......|...../
+.....\.........................-.../..-./...\...................../......\...-.......|.\........-|............
+............|.....................................-....../....\.............../-...|...\..\................./.
+......-./|....../............|.........\............-../...-......./.\..\....../......|/...\..................
+................................|.......|..-..../.............................../.-..................-..-/..|.
+...............................-......./......................|./...............-............./....../........
+..................../....................\........\...........................-............/.../..............
+.|||......../.................|.................../..\............................-......./..|...|/.-.........
+......-......./\....../.........|....../.......-...............|.\........-............/.../..................
+.....................-.\/|................//.../.........|.|......\.-..|.........|.........\..................
+.........................\/.......|.|............................|........|.............................././..
+.................................|.................\../..|/.................\.................-...-........-/.
+......................-...-.........../...........................\....\......-..-.......\.-....\....|........
+......-......../..............\/..................\..|........-..............|...-...../......|...............
+|.......|.../....|..............//.....................|..........|/......../................|................
+...|.|..................../|..../.-.......-...........|.....|./....\......-......-................|...........
+......\/./.|\..../|.|..|..........-....|...........|.-.|...................-.\.....|....................\.....
+......../.\......................|.....|...........|.........../.......|....|...|.......-......../......\...-.
+...|...-...||......-..|..-...........|.-.................|.................................-..................
+..............-.\.-........|......\..........................................\./.\........../.....|...........
+../\.........|...............|............|.\/.-/.................-....|...-.................-.....|..../.....
+....................../......../..../-.....\........................\..-.\....|....-.........../-.............
+.................................|................|.........|................../|.....|....\\............/.\..
+...///./.....\.................|/.....................\...................-............|................|.....
+............-...........................--........\................/.............-\................\.....-.../
+...............\.........../|............................|.....................\...-...\.....................-
+...\.............|.............|................\............\|...../...|.........................|...........
+..................|......|..........-.-..............\.........................\..............................
+....-................../.........../...|................/...............|./.|.../....\..../......./......//...
+...../....../..............................|...\../..........-..........-........-..//..../...................
+...............-......|......................|./........./............/..-...........|../.....-........-./....
+..\.........................|...-.......\.................|..............-........\....-.............-....|...
+.......|......|....../........\...........|......-........../......-..................../....................\
+.......................|....-..|........./.|.-...............|..\......\.....-.......\...-/....|/.........\...
+\......\..-.....................\..........................\................................../...........\...
+-....-......../............................................................../.\.......|..............|....-..
+........|......................|.............-....\................................./..\.......|..........-...
+...-...............|........./......\...../.......|...|...............\.../...\.../......|.....-.\......\.....
+............./.....|......................|.....................................\...||.................-....|.
+./.....-................/........|./....-......../......./..............\..................................\..
+.../..../\........-..........................|.-/.|..\................\\-.......|......./...||.......|........
+.....-.........................-...............\...........|.............-.\.../.|......-.|......../...-.....-
+......\....................|...../......................|.../......-..|............|......./.../.........|....
+...|...........-....................................../.|............./....|..../........./.....\../..........
+....../.../................\........................\...\....\......\............../|...............\.-.......
+./....\.../.............|............................-.../............../............/...........\...|........
+............................|.................|/..........//.........../..-...............|...................
+.....\......\.................|.....|...\-./...............\................|....../.....-..\........-....-...
+........................./-........\................./........-/.|....-.......\............-/\......|.\...-...
+..../../..|.|...............\.......................................-.........................................
+...........|...................................................-...-......|..................\............../.
+/....|......................................................................|\.../.......-...........-...|....
+......|.-.\......-........|.....-..|.\..............-......./......-|.........................-...............
+............\......................................|........................|.-...............................
+.........-.........../....\./....../.-...-..//.........../.......\\...........................................
+........\......../............./...-......\.../..|..|............................../......../..\..............
+--.........|.....-...|............../...|.......|..............\|............|.........................|.-....
+-\......./..............-....-....\...|.-........\/.\./............-/...\........|-.........../../...\........
+.\|\..............-......-.\...-....\..........................\........|...........-......./.............../.
+..........................|...\..../.../..........\.............-...//...............\..................-.....
+........./..........................\............|-.....|..-...|......../........-...........................\
+.......\.../.....\....../.......|..|...............-......................|....-...................-.|........
+......|.......\.../..............................-..............................|......-.-...................\
+/.....|.......-............/|.....|-......./..../......-........../..|......../.-..\..../....../...|..........
+............/..--..........-............\.......\................\........................../../....|.........
+..|..-................|.|..|................/.......\............-//.......................\..\...............
+.......................-......-..................|....\................-......\.|....\....|..../../|.-........
+........................-..................-...........................-..-................-................|.
+/.\....|.-.................................\..-.....\./.........../-.|..............\..\.....--|/....\........
+.......-..-../..................\..--|..............|...............|\........|...--................|./.\.....
+..........|................-.......|..................................................|...................|...
+-.-..|....-.|........-./...|.-.........\.....\/........-........\........../................./.../........\...
+..................../...|/......................................../............\.|./../................/\|....
+...//.........................\....../..............\../.......-..\....|......................................
+............................./..|./../.........-/..\..........................................................
+......\.....|..................|..................\.....\.-..\...../............................../...........
+..........\...........-..........-.....-....\/................../.................................\.....|..\..
+..../.\...................................\............\...\....|.................|.....................-.....
+...........-...........................\.......|-../.|....|.....|......................-...../................
+.......|.........\..............|....\...-......../...........-.....-..-...........-..................\...\.|.
+...........|.......................|....-..........\............................\.................../.\.......
+..../.................\.......-..|.................../........................|...............\...........-.|.
+............./..|.-\..../.....-............-....|..\......|......../............-.........|................\..
+...................\...\/......\............|......................\....|...................-./-..............
+..-\...........|.................../.....|....|............................-..|............\.............\....
+.|.....\....\........|..................\...............|..-/.........|.-/...........-............-...........
+.....\...../......-............|........./..|............-........................\....-......................
+......\......../........|..............\...-..-...|.......................................................|...
+...................|.................................\.....\...........................|../.|.-......-........
+..................|..............\.....\............|........../....../...............\.........\.............
+..|...........-..../....\.........--...\................../.............-...-....................-..../....|..
+.|...\...................|......-...........-\..........\.....|.....|..........|.........|....|-../...........
+.............\|...................../\...............\....../.......-....\.....................-..............
+.......//.....................\....\......\......\.........|...................../......../.........\......-..
+.\./.........-...-./-.\.............../......|................................\|....\...../....-..............
+.......|......../......../......./.........../...............|............................../..|......../.....
+............./.........|.....-./.........../....-......./|......-................|............................
--- a/2023/go/main.go
+++ b/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
 	}
--- a/2023/go/utils/grid2d/grid2d.go
+++ b/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 {
--- a/2024/.vscode/launch.json
+++ b/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"]
+        }
+    ]
+}
--- a/2024/gareth/day01/day01.go
+++ b/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
+}
--- a/2024/gareth/day01/day01_test.go
+++ b/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)
+}
--- a/2024/gareth/day01/input.txt
+++ b/2024/gareth/day01/input.txt
--- a/2024/gareth/day02/day02.go
+++ b/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
+}
--- a/2024/gareth/day02/day02_test.go
+++ b/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)
+}
--- a/2024/gareth/day02/input.txt
+++ b/2024/gareth/day02/input.txt
--- a/2024/gareth/day02/poc.py
+++ b/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()
--- a/2024/gareth/day03/day03.go
+++ b/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
+}
--- a/2024/gareth/day03/day03_test.go
+++ b/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)
+}
--- a/2024/gareth/day03/input.txt
+++ b/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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--- a/2024/gareth/day04/day04.go
+++ b/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
+}
--- a/2024/gareth/day04/day04_test.go
+++ b/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)
+}
--- a/2024/gareth/day04/input.txt
+++ b/2024/gareth/day04/input.txt
@@ -0,0 +1,140 @@
+XASXMAXXMSXXSMMSXMMSMXSMXMSSMSSSMMSMAMXMXSMMMMAXAMXSASXSSMMSSMXAMXMSAMXMMXAXXXSAMXXXXXMMXSXMXXSMASAMXMXAXXMASAMXXXMAMMMSXSXMXMMMSAASXSMSSMMS
+XASAMSSMAMMMAMAAAMASMAMAAXMASAAASAAMAMAMAAAAASMSSSSMAXAAAXASASMMMMMMXMASXMAMXXXXSMSMSXSAAXAMXMASMXMMSMSAXSXMMSXSMMAAMXAMAAMMAAAAXMXSAAAAXAAM
+MXSXMAAMXAAAXMMSSMAXMASXSSSSMMSMMSXSASMSMSSMMMAAAXXXXMMMMMXXAMMAAAASMMAAAXMASMXXXAAASAMMXSASASMMMAMXSASASASMAXXMAMSSSMSSMMAXSMMSXMMMMMMMXAMX
+SAMMMSSMMXXSXXXAAMSMSASXAAXMXXAAXXXMAXAAAXXMASMMMMMMXMXXXXSMXMSSMSASASMMXMMXMAAMASMSMSMAASXSAAAASAXAMAMXAAXMASMSSMXAMMMAMXSAMAMAASXMMSSMSAMX
+MASAAAAMSMMMMMMSMMMAMAXMMMMMXMSSMMXMSMMMMMAMXASAXAASXMMASAAXAXAXMXMXMXAASXMAMSXSAMMXMMMMMSAMXMSMSMSMMAMSMXMMASAMXAMMSASAMMXASAMSXMAMXAAXSAMA
+SSMXMSMAAMAAXXAMXASMMSMAMXSXSAMXXMAAAAXSXSAMXMASMSXMASXAMSAMXMMMSASMXMXMMAMSMXAMASXMXAASXMMMMXMMXAAXXAMXXAAMAMAMXXXASXSASXMMSAMMASXMMMMMMMMS
+XXXXMAMMMSSSMXSXSASXAXSXMASAMXSMXMASMSMSXMASXXMMXMXSAMMXMAXAMAXXSXSAASMASXMXAMXMMMAASMXXAMXMMAXMXMSMSAMSSMSMMSSSSMMMSXMXMASXSMMXAXAXSSSMXAAX
+MMXSSXSMXAMAMAAAMSXMXMMXMASXMMSAMXXAAMXSASAMMXXSXMXMASXSSSMXSSMXXMXMMSAXMASMMMSMASAMXMASXSAMSSMSMAAAMAMAXAMAMAMXAXAXSAMXMXAXMMSMMSXMAAAMSAMX
+AXMXMASMMASAMXSXMMXSAMAAMXMMMAXMMSMMXMASAMXSXMXMAAMAMSAMAAAMSAMMSXMXSXMXAXMASAMXAXMASXMAMMAMAAASMMMSSSMSSMXSAMXSMSMXXAMXSSMASAMAMMASMMMASMMM
+XMAMSXSASASASMXXMAMMAASXSAAAMMXAAXXAMMMMSMSMXMAXMXMAMXAMSMMMSAMASAMXSAMMMMXMMAMMSXXAMAXXAMSMMSMMAXXXMAAAAMAMAXXAMXXSMSAXAAXAMMMAMSXMAXXMSASX
+MSSMXASAMXSMMMAXASMSMMAXMAMSASXMAXMMSAXSASAAASMXMASMSSMMMAAXSAMMSAMAMAMMSAMSSSMSAMMSSSMSMXMAXXASXMMMMMMMSMASASXSXMASAXXMSSMMXMXMMMMSAMMXSAMX
+MAMMMMMMMMMASAMMMXAAXXMASAAXASMMSXMAXMXSMSMSMSXAMMXXAMXASXMXXAMASAMSSXAAMAMAAMXMASAAAAAAXSSSMMAMASASXXXXMMXSASAXXAAMAMAXXMXSASASAMASAMXAMAMX
+MASXAXAMXXSAMMAAXMSMMXMAMXXMMMAAMMMSXMMSXMXAAXXMSAMMSSMMSMMMMAMASAMAXMASXMMMSXAXXMMMSMMMAXAAXXSSMSASMMSAMXXMAMAMXSSMSMSMAMAXXSXSASXMSSMXSAMM
+SXMXMSSSMMMASMSMSMAAMASXMMXSASMMXXAMXXASASMMXMAMAAXAMAMAXAASXMMXMMSMXXAXMSXMAXXSSSXAXAAXMMMMMMXAXMMMXAAMAMMMXMAMAMXAMAXAAMASAMASAMXMAMMXSASA
+MMMXMXXAXAMAMMAAAMSMMAXAASASAXXXSMSSSMAMXMAMXXASXSMMSMMXSMMXAXSXMAXAMMMXXMAMSAMXAAMSSSMMXAAAAXSAMXXAASMXAASMASXMSSMAMAMMXSAAAMAMAMSMAXSAXAMM
+SASASMXMMSXSXSMSMMXSMXXXMMASAXSXMAXAAMMMSSMMMXASXMXMAAXMXMMMXMSAMXSXSASMASAMMSSMMMMAAAXMSSSSMXXAMXMAXXXMSMSAAMAMAMAMMMMXXMMSSMMXAMXXAXMASXSM
+MASMMAMSAMMMMAMMXSAMXSMSAMXMMMAAMAMXMAMAMAAAAMSMXSASMXMAAAXSAMXAMAAMSAMSAMXSAMMASAMXSSMMMAMMXXMSMMXMSSMMXAMMXSAMMSAAAAMXAAMAXASXSMSMMSMAMAAX
+MMMMMSMMAMXAAMMAAMMXAMMAAAXAXSSXMAMXMAMASMMMXMAAXSASAMSSMSASASXMMMSXMAMXXMMMMXMAMAXAMXAXXSAAASAAAXXXAAMAMAMAAXAMXSASMXSASXMSSMMAMASAMSMMMSXM
+SAAMAMAMAMSSSXMMXSSMSSSSSMSSXAAMSXSXSASASAMAMSMSMMMMXAAXAXMSAMASXSMMXSMSMSXSSSMMXMMXSSSMAXMXSXMMAMXMSXMASMMMXSAMAXAXMASMMMMASAMXMAMAMXAXAMXA
+SSSMASXMMXMAMXMMAMXAAAAMMAAXAASMSXAAXAMASMMAXAMAAMSAMMMMSMMMXSAMXMAAMXAMAAXMAAXAAMMXMAMMAMMXXAXMAXSAAXSXSXXAASAMAMSMMMXXMXMMSMMSMXSXMSXMXMMS
+XAMMAMAMXMMSMMSMAXMMMSMMSMMXMAMAXXMSMSMMMXXMMSSSSMMXMAAAMAXXMMMSXMMMSMAMSMMMSMMSXXASMAMMASMMMAMSSMASMXSAXXMMMXXXMXMXXAMMSASMMMAXMXMXAMXSAMXA
+MMXMXSAMMXAXAXMSMSXXAAAAAMSMMXMAMXXAAMASMSXSAAXXAAMAMSSSSSMSXAAXMSMXAMXMAMAMXAMASXXMMMSMMMAMMSMMAMMAXAMAMSXSSMSSMMMASAXASMXAAMXSXAMXMAMXASMS
+AXMSMSXXAMXSMMMMXAMMMSMMMSAASAMMMSSMSSXMAAAMXSMXSSMAMMAMMAASXMMSAAXSXSSSSSSMMAMASXAXXASXSSMXAMAXAMXAMMMSMMASXAAXAASAMXMMXXSSMMSMMXSAMSMSMMMA
+SMAAAMASXMMSMMXMMMMXAAXASMMMMASXAAAXAXAMSMMMAAAXXAMXXMAMSMMMAXSMMMMMSAAAAAXAXSMMSMMMSAMAXXXMSSMSSSMMSAAXAMSMMMMXSMSASXXSXMMXAXMAAXXASMAAXASM
+XMSMSMAMAAAMMSASAAAMSSSXSAMXSAMMMSSMMSMMAMAXSXSXSAMAXSAMXMMSSMXAAXASMMMMMSMMXMAXMASASAMSMMSAMXXMXAAASMSSMMASAAXAXASAMAMMASMXSMSMMSSMMMSMSMSX
+MXXMAXASMMSSXMASMMMAMXMAMXMAMAMXAAXMMAAXMSAXMSMASMMSASAXSMAAXAMXMSXXSMXSAAMMAMAMXMMXSAMXMAXMASMSMMMMSMXAMAMXSMSXMAMXMXASMMSAAAMXAXXASAMXAASA
+MMSXMMMXMAAXMMXMMMSSMMMAMSMSMSMMSSSSSSMMXSXSMAMAMXAXASMMSMMSSSMSMAXMXSAMXSASASXSSXMASMMSXMMSMMAMXSAXXMXMAXXMAXSAMAMMAMXXSAMXMMMMMSSMMAXSMMMS
+MASMSASXMMMSSMAAAAMAAXSSMSAAAAXXAAMAAAMSXMASMXMASMMMMMAAMAMMXXMASMAMAMMSMXAMAMAAXXSASAXMASMASMMMASXXAXMSMSSSMAXMXSMSAXMAMXMSMSXXMAMASXMASAAX
+MXXAXAXMXAAMASXXMSSSMMMMAXSMSMSAMXMMMMMSAMAMAMAMXXAASAMXXAMMSSSMSXAMAMXAAMXMSMMMMXMAMXMSXASAMXSMAMMSSMXAAMAAXAXSAMXSASMSMAXAAMSAXASMMASAMMSM
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+XMAAAXMASMSSMMMMMMMXSAMXAXMASMSSSMMAMSMMSSMXXMXMXSAMAMXMASASMMXAAMXXMAAXXMAMAMXSSMMMMMMXMASMAMAMMASASMSMSASMSSXMASASAMAAAMASXMXAMSXMXXAMXSXM
+MAMXXXSXSXMMXAMASXMASAMXMXSAXAMAAXMAMMMAMAXSMMMMMMSAMXAXMXXAXAMSSSSSSSMMAMAMSMMXMASAAAMAMXMMASAMMMSAXAXXMAMAAXMXMSASXSMMMSAMXSMMMXAMASASMMSM
+ASMMSASAMMMMSXSASAXXXMAXXMMAMSMSMSSSMSMSXMMMAAXMAAAMMXMSMSMMMMMAAMAXAXMSASXSAMMASXMMSMSMSMXSASASXXMAMXMMMSMMMSSMMMXMAXXAXMASAXXXAMAMXSAMMAAX
+MXAASAMAMAAXMXMASMMMSAMXMSSSMAMMAMAMASAMASMSSMSSMXMMSAAXAASAAMMMSMMMASXMASXAAXMASAXAMXAAMAXMMSAMXAMMMASAAXASAMXASXSMSMSMSSMMMMXMSSSMXMAMMSSX
+XSMMMASMMSSXSAMXMAAMASXXMAAASXMMSMAMMMASAMXAASAXXXSASMMMSMSMSSXXAMXMXMASXMASMMMASXMASXMMMXSAAMAMSMAAAASMXSAMSSSMMASAAAAMMAXMAMXAXAAMAMAMXAXX
+AXXXSXMAXXMXSSSMSSMSXMSSMMSMMMXXXAMXSMXMXMMSSMSMSAMXSAMXXXXMMMMAMXXXSSXMXSAMXXMXMXAXXMASXMSMMSMMSXSAMMSXMMMSXMAXMAMXMSMXSAMSXSXSMSMMXSASMASX
--- a/2024/gareth/day05/day05.go
+++ b/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
+}
--- a/2024/gareth/day05/day05_test.go
+++ b/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)
+}
--- a/2024/gareth/day05/input.txt
+++ b/2024/gareth/day05/input.txt
--- a/2024/gareth/day06/day06.go
+++ b/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
+		}
+	}
+}
--- a/2024/gareth/day06/day06_test.go
+++ b/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)
+}
--- a/2024/gareth/day06/input.txt
+++ b/2024/gareth/day06/input.txt
@@ -0,0 +1,130 @@
+#.............#.#...........................................................#..........#...........................#..........#...
+............#......................#.......#..#.........#...................##....................................................
+..............#...........#..#.......#.........#.#...........................#................................#......#............
+.....#......................................#......#..#...................#....................#......................#...........
+...#............................#................................#................................................................
+..........#..................#.....#......................................................#.......................................
+..#........#.......#.#...............................................................#......#.................................#...
+.#....#................#................#.....#...................#...............................................#..#............
+.......................................................................................#...#.#....#........##......#........#.#.##
+............................................#.................#.....................#..........................#..................
+....#..........##......................#.................................................................................#........
+......#.............##.........#.......#.........#.......#.............#...#.......#..............................................
+.#............................................................................#..........#....#...................................
+...#..#....#..............................#...........................................................................#...........
+.............#....................................................................................................................
+................................#..................##...................................#...............................#......#..
+..........#.........#.................#..........###...........................................#............#...#.................
+.............#....................................#.......#.#.#............#............................................#.........
+......#.#..............................................................................................#.........................#
+...#...#.........#.........#..#......#................##.................#........................................................
+.................................#......................#........#................#........................#......................
+.......................##..............#................#................#..............................#.........................
+.......#...#.....#.....##........................#..................##.....#......................................................
+.............................................#...........................#..........................................#.....#.......
+.........................#...............#....#..............#.......#...............#.#.................#.................#......
+...........................................................#....#..................................#..............................
+..........................#.................................................#............................##....#..................
+.................#...#.........................................................#........................#.....#..#................
+.........................#....#................................................#...#.....................#....#...........#.......
+................................................##.......#.#....................................#.......##........................
+..........##...#.......................#....#..#....................#........................#....................................
+#......#.......................#............#.....................................................................#...............
+.......#.......#...#..#..........#.......................................#.............#......#...................................
+...............#............#..................#.................................................................................#
+.......#...........#.......................##.....#.........#...........#...................#......#.........#.............##....#
+...................#.........................#......#..........................................#..........#.........#......#......
+.....#............#..............#...#......#....................#.............#..................................................
+................................................#........#.....#...................#.....................................#.....#..
+......................#.#...##......................##...............................................#.................#..........
+#...................#.........................#...........#.....#................#.....................#...................#......
+....#................#.....#.............#.....................................#....#...#.................................#.......
+.........#.....................................................................................................#.#.......#........
+.........#..........##..............................#............................#.#.............................#................
+#....#.#..............................................##...#...#...............#.............#....................................
+........#..#.#...................#.......................................................................#.............#..#.#...#.
+.................................................................................................................#.......#........
+............................................#..#...............##........#..........#.......................................#....#
+........#...........................#............................#.....#........................#..........#...#..........#.......
+.#...........#...................................................#...........................................#................#.#.
+............#...............................#........#...........#..........#...........#.#..............#........................
+...............................................................................##.#................#..............................
+.#.......................#.#...........#..................................#.......................................................
+..#..............................................##................#.......#....#..............#.....................#...#........
+...................#.....#................................................#..........#.........#.........#.....................#..
+........#................#................................................................................#......#................
+...................#...#....#.........................#.........................#....................#..........................#.
+.................#.......................................................#................................................#.......
+..#...........................##.#.............#..#............................................#.......................#.#........
+..#......#.........................................................................#.......................#......................
+...........................................................................................................#............#......#..
+............................................................^..........................................#..........#...............
+..#.........#....................#..........................................#........#.........................................#..
+........#...............#....#.............#......#.........................................................................#.....
+.........#......#.....#..............#...........................................................#..............#.................
+.........#...................................................#...###...........#.......#.##.......................................
+.....................##.................#.........##.....................#................#................#.........#............
+.......................................................................#..............#..............#.................#..........
+.##.........#..........................................................................#....................................#.....
+.........................#.............................#........................................................................#.
+........#.............................................#......#....#.....................................#....................#....
+........#...#..............................................................................#.........#............................
+..............................#................................#..........#..............#..................................#.....
+........##..#...................................#................................#.................#.........#......#..#........#.
+..................#......#...................................................................#....................................
+..........#.............#..............#........#............#...............#..#..........#..............#.#...#............#....
+............................##....#..............#......................................................................#.........
+...............................................#.....#...........#.....##...............#..#......................................
+.........................#.......#...............................#...........#.........#...........#....#.........................
+.#............#...#...............#..............................................................#..........................#....#
+#...........#......................................................#.............................#......#.........................
+..................................................#....#...............#.........................#................................
+................................................#..........................#.......#..............................#....##.......#.
+........#......#..#............#................#............................#......#.##.........#....................#..#........
+.......................................................#..#.#....................#..#......................................#......
+.....................#.......................................................................#............#.......................
+.....................##........................#...................#.....................#........................................
+..........................#...........................................................................................#...........
+..#..........#...................#..............##..#.....................#...................#..............#...........#........
+#................................#....##......#.............#..............#.......................#.........#...........#........
+..................#................#...............................#.....#..........#................#..............#.............
+................#.#.........#.....##...............................................................#..............#...............
+..#...............................................................................................#...............................
+..........#.................#...........#.......#.........................#...#.......#...........................................
+..##....#......................................#.#.......................................#.................#......................
+.......................#..#...#.##......................................................................#.........#...#...........
+...............#.........#..............#.....................................................#...................#...............
+......#.................#............#......#...................#..#.........................#........................#........#..
+......................................................................#...........................#........#......................
+..........#..........#........................#.............##....................................................................
+....#................................................#.......................#................#...............#...................
+.................#....................................................#......#....................................................
+.#........#.......................................................................................................................
+......##..................#....#......#.................#....................#.....................#..#...........#...............
+#...#...#...#..............#........#.......................#.#..........#...............................#......#.................
+#...#...................#.............#........#..........#...............................................................#...#...
+..#................................#...#.........................#...................#......#.....................................
+...#...###..........#............#...............................................................#..........#.....................
+............#..............#.......#.....#..........#.....#.........................................................#............#
+..#......................#..#...#................................#......#.......#.....#..................#.........#..............
+....##......#.......................................................#..............................................#..............
+...............................#.....#....#.................................................#.......#............#................
+..........#....#......................#........#..........................#......#................................................
+......#.............................#...........#..................#...........................#................................#.
+...........................##..........................................#.....#.#.....................#................#...........
+..#..............#.........................................................#........................#.........#.................#.
+#.....#.....#......................#....................#........................................#...........#...........#......#.
+.......................................#..#................................#.........#.......#..#.....#..........................#
+..........#..............##...............#..........................................................#......#......#......#....#..
+.............#..............#..#......#........#..#......##.......................#...........#.......#...........................
+......................#.......................................#.......#..#.....................................#.........#...##...
+...........................#...........................#......#....#.............................#.............................#..
+..................#............................#....#........##.........................#..............#.............#............
+.......#....................#.....#........#.......#.#...#...............#.....#.#.........................#.......#.#............
+.....#.........#.......#..........#.................#..#...#..................................................##..................
+................#........................................................#........................................................
+....##......#........#..................#.........................#...................................#...#...................#...
+..............#....................#.......#.......................#.............#......#..............#..........................
+...........................#..............#.....#............#.....................#........#....#.......................#........
+........#..##................#.....#.#..............#..............................#........................#.........#...........
+.........................................................#...........................##..........#........#.##....................
--- a/2024/gareth/day07/day07.go
+++ b/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
+}
--- a/2024/gareth/day07/day07_test.go
+++ b/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)
+}
--- a/2024/gareth/day07/input.txt
+++ b/2024/gareth/day07/input.txt
@@ -0,0 +1,850 @@
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--- a/2024/gareth/day08/day08.go
+++ b/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)
+}
--- a/2024/gareth/day08/day08_test.go
+++ b/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)
+}
--- a/2024/gareth/day08/input.txt
+++ b/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
--- a/2024/gareth/day09/day09.go
+++ b/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
+}
--- a/2024/gareth/day09/day09_test.go
+++ b/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)
+}
--- a/2024/gareth/day09/input.txt
+++ b/2024/gareth/day09/input.txt
--- a/2024/gareth/day10/day10.go
+++ b/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
+}
--- a/2024/gareth/day10/day10_test.go
+++ b/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)
+}
--- a/2024/gareth/day10/input.txt
+++ b/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
--- a/2024/gareth/day11/day11.go
+++ b/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
+}
--- a/2024/gareth/day11/day11_test.go
+++ b/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)
+}
--- a/2024/gareth/day11/input.txt
+++ b/2024/gareth/day11/input.txt
@@ -0,0 +1 @@
+965842 9159 3372473 311 0 6 86213 48
--- a/2024/gareth/day13/day13.go
+++ b/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
+}
--- a/2024/gareth/day13/day13_test.go
+++ b/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)
+}
--- a/2024/gareth/day13/input.txt
+++ b/2024/gareth/day13/input.txt
--- a/2024/gareth/day14/day14.go
+++ b/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
+}
--- a/2024/gareth/day14/day14_test.go
+++ b/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)
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Alan R Evans	bcd7daea9e	day02	2025-12-04 11:56:36 +00:00
Alan R Evans	9c2e2c68dd	day04	2025-12-04 11:53:17 +00:00
Gareth	90083f28e5	Day02	2025-12-02 06:54:15 +00:00
Gareth	7f6c31c003	Day03	2025-12-03 20:03:14 +00:00
Gareth	015607cde3	Day01	2025-12-01 18:11:11 +00:00
Alan R Evans	358249e78a	day1	2025-12-01 14:04:11 +00:00
Alan R Evans	d730d3c444	after pull	2025-02-14 15:16:07 +00:00
Alan R Evans	759b9c9544	work	2025-02-14 15:14:46 +00:00
Gareth	a529516bab	Day22	2025-01-22 22:31:04 +00:00
Gareth	ba588cbc77	Day21	2025-01-20 17:32:23 +00:00
Gareth	225d74acf9	Day20	2025-01-14 15:21:34 +00:00
alan	3e69c5b463	Merge pull request 'Merge alan onto master' (#1 ) from alan into master Reviewed-on: #1	2025-01-14 12:23:46 +00:00
Alan R Evans	6ab021face	move to alan branch	2025-01-14 12:14:43 +00:00
Alan R Evans	1ee00e8d45	Merge branch 'tmp'	2025-01-13 23:57:55 +00:00
Alan R Evans	952def48a0	Revert "fix missing" This reverts commit `08b38c2bd3`.	2025-01-13 23:51:28 +00:00
Alan R Evans	08b38c2bd3	fix missing	2025-01-13 23:48:55 +00:00
Alan R Evans	29387606b0	updates	2025-01-13 18:48:07 +00:00
Gareth	4619bc7775	Day09	2025-01-11 16:39:58 +00:00
Gareth	305ce52a98	Day08	2025-01-11 16:39:58 +00:00
Gareth	a5b1227979	Day14	2025-01-11 16:39:58 +00:00
Gareth	53557adddb	Day10	2025-01-11 16:39:58 +00:00
Gareth	5b8676f6e0	Day19	2025-01-11 16:39:58 +00:00
Gareth	ee128f3aa8	Day18	2025-01-11 16:39:58 +00:00
Gareth	d93049c434	Day13	2025-01-11 16:39:58 +00:00
Gareth	507cb1a907	Day11	2025-01-11 16:39:58 +00:00
Gareth	a64c3ef3c4	Day07	2025-01-11 16:39:58 +00:00
Gareth	2c9b7766e3	Day04	2025-01-11 16:39:58 +00:00
Gareth	ae293fe5a2	Day06	2025-01-11 16:39:58 +00:00
Gareth	c1c89faef8	Day05	2025-01-11 16:39:58 +00:00
Alan R Evans	b1a4969f6d	day4	2025-01-11 16:39:58 +00:00
Gareth	e2ab6dce9a	Day03	2025-01-11 16:39:55 +00:00
Alan R Evans	f8c29be7ef	day9	2024-12-09 16:46:10 +00:00
Alan R Evans	19c4afdc98	days	2024-12-08 20:51:22 +00:00
Gareth	616618c7e2	Day04	2024-12-04 14:00:00 +00:00
Gareth	360ae5edbd	Day06	2024-12-06 16:56:58 +00:00
Gareth	88938a8627	Day05	2024-12-05 13:39:33 +00:00
Alan R Evans	235999524b	day4	2024-12-04 09:03:29 +00:00
Gareth	f6f5a10270	Day 03	2024-12-03 11:15:43 +00:00
Alan R Evans	8f4649e0aa	Day3	2024-12-03 07:24:42 +00:00
Alan R Evans	e0b4f292c2	day3	2024-12-03 07:24:42 +00:00
Gareth	8f5cb6b236	Day02	2024-12-02 13:40:07 +00:00
Gareth	c133fe757c	Day01	2024-12-02 12:52:40 +00:00
Alan R Evans	ab9bdc63b1	day2	2024-12-02 10:11:17 +00:00
Alan R Evans	0034691f2a	2024 day1	2024-12-01 08:02:28 +00:00
Alan R Evans	2584df5496	finish 2023	2024-12-01 08:01:55 +00:00
Alan R Evans	6753ed26ca	much better day13 after looking at others	2023-12-15 17:59:46 +00:00
Alan R Evans	e9a6c5178a	day 12,13	2023-12-15 16:07:58 +00:00
Alan R Evans	3948cbaa8c	day9,10,11	2023-12-13 23:54:55 +00:00
Alan R Evans	84e8207917	day08	2023-12-12 12:37:30 +00:00
gareth	c53e7db1ea	Merge branch 'master' of https://gitea.kageds.com/alan/adventofcode	2023-12-09 21:38:37 +00:00
gareth	d730b7ff9d	Days 7,8,9	2023-12-09 21:38:21 +00:00
gareth	7e3eae9e60	Add back Day 1	2023-12-07 14:53:16 +00:00