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day9,10,11

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This commit is contained in:
Alan R Evans
2023-12-13 23:54:55 +00:00
parent 84e8207917
commit 3948cbaa8c
11 changed files with 1115 additions and 2 deletions
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146
2023/go/day11/day11.go Normal file
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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
}

38
2023/go/day11/day11_test.go Normal file
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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)
}

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2023/go/day11/input.txt Normal file
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