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day18

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This commit is contained in:
Stefan Harmuth 2021-10-24 20:59:45 +02:00
parent 3cea8acd1f
commit 44b8be5a9e
4 changed files with 45 additions and 1 deletions
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41
day18/day.go Normal file
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@ -0,0 +1,41 @@
package day18
import (
"tools"
)
func getGridFromInput(inp string) tools.GridToggle {
grid := tools.NewGridToggle()
for i, c := range inp {
grid.Set(i, 0, c == '^')
}
return grid
}
func calcTraps(grid tools.GridToggle, cols, rows int) tools.GridToggle {
for row := 1; row < rows; row++ {
for x := 0; x < cols; x++ {
grid.Set(x, row,
(grid.State(x-1, row-1) && grid.State(x, row-1) && !grid.State(x+1, row-1)) ||
(!grid.State(x-1, row-1) && grid.State(x, row-1) && grid.State(x+1, row-1)) ||
(grid.State(x-1, row-1) && !grid.State(x, row-1) && !grid.State(x+1, row-1)) ||
(!grid.State(x-1, row-1) && !grid.State(x, row-1) && grid.State(x+1, row-1)))
}
}
return grid
}
func Part1(puzzle tools.AoCPuzzle) interface{} {
inp := puzzle.GetInputString()
width := len(inp)
field := calcTraps(getGridFromInput(inp), width, 40)
return (field.MaxX+1)*(field.MaxY+1) - field.GetOnCount()
}
func Part2(puzzle tools.AoCPuzzle) interface{} {
inp := puzzle.GetInputString()
width := len(inp)
field := calcTraps(getGridFromInput(inp), width, 400000)
return (field.MaxX+1)*(field.MaxY+1) - field.GetOnCount()
}

1
inputs/18 Normal file
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@ -0,0 +1 @@
^.^^^.^..^....^^....^^^^.^^.^...^^.^.^^.^^.^^..^.^...^.^..^.^^.^..^.....^^^.^.^^^..^^...^^^...^...^.

1
inputs/18_test Normal file
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@ -0,0 +1 @@
.^^.^.^^^^

3
main.go
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@ -17,6 +17,7 @@ import (
"aoc2016/day15"
"aoc2016/day16"
"aoc2016/day17"
"aoc2016/day18"
"flag"
"fmt"
"os"
@ -51,7 +52,7 @@ func initDayFunctions() {
15: {1: day15.Part1, 2: day15.Part2},
16: {1: day16.Part1, 2: day16.Part2},
17: {1: day17.Part1, 2: day17.Part2},
// 18: {1: day18.Part1, 2: day18.Part2},
18: {1: day18.Part1, 2: day18.Part2},
// 19: {1: day19.Part1, 2: day19.Part2},
// 20: {1: day20.Part1, 2: day20.Part2},
// 21: {1: day21.Part1, 2: day21.Part2},