Brian Buller
77d53011a1
Added a todo file to track changes to my helpers that need to be propagated through previous days/years
73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
package main
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import (
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"fmt"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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part1(inp)
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fmt.Println()
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part2(inp)
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}
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func part1(input []string) {
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m := h.StringSliceToCoordByteMap(input)
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for y := m.Height() - 1; y >= 0; y-- {
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if !m.RowContains(y, '#') {
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m.InsertRowAfter(y, '.')
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}
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}
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for x := m.Width() - 1; x >= 0; x-- {
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if !m.ColContains(x, '#') {
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m.InsertColAfter(x, '.')
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}
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}
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galaxies := m.FindAll('#')
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var result int
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for i := 0; i < len(galaxies); i++ {
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for j := i + 1; j < len(galaxies); j++ {
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result += galaxies[i].Distance(galaxies[j])
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}
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}
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fmt.Println("# Part 1")
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fmt.Println(result)
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}
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func part2(input []string) {
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m := h.StringSliceToCoordByteMap(input)
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expansion := 1000000
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galaxies := m.FindAll('#')
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for y := m.Height() - 1; y >= 0; y-- {
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if !m.RowContains(y, '#') {
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// For every '#' coordinate on a row _after_ y, add 1000000 to it's y coord
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for i := 0; i < len(galaxies); i++ {
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if galaxies[i].Y > y {
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galaxies[i].Y += (expansion - 1)
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}
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}
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}
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}
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for x := m.Width() - 1; x >= 0; x-- {
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if !m.ColContains(x, '#') {
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// For every '#' coordinate on a col _after_ x, add 1000000 to it's x coord
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for i := 0; i < len(galaxies); i++ {
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if galaxies[i].X > x {
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galaxies[i].X += (expansion - 1)
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}
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}
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}
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}
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var result int
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for i := 0; i < len(galaxies); i++ {
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for j := i + 1; j < len(galaxies); j++ {
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result += galaxies[i].Distance(galaxies[j])
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}
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}
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fmt.Println("# Part 2")
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fmt.Println(result)
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}
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