71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
package day18
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import (
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"tools"
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)
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func play(grid tools.GridToggle, stuckCorners bool) {
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neighbours := tools.NewGridInt()
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for _, thisCoord := range grid.GetCoordinates() {
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for cx := thisCoord.X - 1; cx <= thisCoord.X+1; cx++ {
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for cy := thisCoord.Y - 1; cy <= thisCoord.Y+1; cy++ {
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if cy == thisCoord.Y && cx == thisCoord.X {
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continue
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}
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neighbours.Add(cx, cy, 1)
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}
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}
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}
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for x := 0; x <= grid.MaxX; x++ {
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for y := 0; y <= grid.MaxY; y++ {
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if grid.State(x, y) {
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if neighbours.Value(x, y) != 2 && neighbours.Value(x, y) != 3 {
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if !stuckCorners || !grid.IsCorner(x, y) {
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grid.Set(x, y, tools.Off)
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}
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}
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} else if neighbours.Value(x, y) == 3 {
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grid.Set(x, y, tools.On)
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}
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}
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}
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}
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func makeGridFromInput(input []string) tools.GridToggle {
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grid := tools.NewGridToggle()
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for y, line := range input {
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for x, c := range line {
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if c == '#' {
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grid.Set(x, y, tools.On)
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}
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}
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}
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return grid
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}
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func Part1(puzzle tools.AoCPuzzle) interface{} {
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grid := makeGridFromInput(puzzle.GetInputArray())
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for i := 0; i < 100; i++ {
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play(grid, false)
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}
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return grid.GetOnCount()
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}
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func Part2(puzzle tools.AoCPuzzle) interface{} {
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grid := makeGridFromInput(puzzle.GetInputArray())
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grid.Set(0, 0, tools.On)
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grid.Set(0, grid.MaxY, tools.On)
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grid.Set(grid.MaxX, 0, tools.On)
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grid.Set(grid.MaxX, grid.MaxY, tools.On)
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for i := 0; i < 100; i++ {
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play(grid, true)
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}
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return grid.GetOnCount()
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}
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