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| package solutions23 | ||
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| import kotlin.math.max | ||
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| class Contraption(val array: Array<CharArray>) { | ||
| val result = Array(array.size) { Array(array[0].size) { emptySet<Char>() } } | ||
| val checkedSides = Array(array.size) { Array(array[0].size) { emptySet<Char>() } } | ||
| var currentMax = 0 | ||
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||
| companion object { | ||
| fun dirToChar(vDir: Int, hDir: Int) = | ||
| when(Pair(vDir, hDir)) { | ||
| Pair(1, 0) -> 'v' | ||
| Pair(0, 1) -> '>' | ||
| Pair(-1, 0) -> '^' | ||
| Pair(0, -1) -> '<' | ||
| else -> '.' | ||
| } | ||
| } | ||
|
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||
| fun resetResult() { | ||
| for (row in result) { | ||
| for (j in row.indices) { | ||
| row[j] = emptySet() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // do this after finishing following the light beam | ||
| fun markCheckedSides() { | ||
| for (i in listOf(0, array.size - 1)) { | ||
| for (j in 0 until array[i].size) { | ||
| checkedSides[i][j] = checkedSides[i][j].union(result[i][j]) | ||
| } | ||
| } | ||
| for (j in listOf(0, array[0].size - 1)) { | ||
| for (i in array.indices) { | ||
| checkedSides[i][j] = checkedSides[i][j].union(result[i][j]) | ||
| } | ||
| } | ||
| } | ||
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||
| fun followLightBeam(x: Int, y: Int, vDir:Int, hDir:Int) { | ||
| if(x < 0 || x >= array.size || y < 0 || y >= array[0].size) | ||
| return | ||
| // mark the current position as visited | ||
| if(result[x][y].contains(dirToChar(vDir, hDir))) return | ||
| else result[x][y] = result[x][y] + dirToChar(vDir, hDir) | ||
| // follow the light bean | ||
| when(array[x][y]) { | ||
| '.' -> followLightBeam(x + vDir, y + hDir, vDir, hDir) | ||
| '/' -> { | ||
| val nvDir = hDir*-1 | ||
| val nhDir = vDir*-1 | ||
| followLightBeam(x + nvDir, y + nhDir, nvDir, nhDir) | ||
| } | ||
| '\\' -> followLightBeam(x + hDir, y + vDir, hDir, vDir) | ||
| '|' -> { | ||
| if(hDir == 0) followLightBeam(x + vDir, y + hDir, vDir, hDir) | ||
| else { | ||
| followLightBeam(x + 1, y, 1, 0) | ||
| followLightBeam(x - 1, y, -1, 0) | ||
| } | ||
| } | ||
| '-' -> { | ||
| if(vDir == 0) followLightBeam(x + vDir, y + hDir, vDir, hDir) | ||
| else { | ||
| followLightBeam(x, y+1, 0, 1) | ||
| followLightBeam(x, y -1, 0, -1) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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||
| fun checkOneOption(x: Int, y: Int, vDir:Int, hDir:Int) { | ||
| if(checkedSides[x][y].contains(dirToChar(vDir, hDir))) return | ||
| followLightBeam(x, y, vDir, hDir) | ||
| currentMax = max(currentMax, energizedTiles()) | ||
| markCheckedSides() | ||
| resetResult() | ||
| } | ||
|
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||
| fun checkAllOptions() { | ||
| // check top | ||
| for (j in 0 until array[0].size) { | ||
| checkOneOption(0, j, 1, 0) | ||
| } | ||
| // check bottom | ||
| for (j in 0 until array[0].size) { | ||
| checkOneOption(array.size-1, j, -1, 0) | ||
| } | ||
| // check left | ||
| for (i in 0 until array.size) { | ||
| checkOneOption(i, 0, 0, 1) | ||
| } | ||
| for (i in 0 until array.size) { | ||
| checkOneOption(i, array[0].size-1, 0, -1) | ||
| } | ||
| } | ||
|
|
||
| // return sum of all the array elements that are true | ||
| fun energizedTiles() = result.sumOf { it.sumOf { list -> if(list.isNotEmpty()) 1.toInt() else 0 } } | ||
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||
| } | ||
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| fun main() { | ||
|
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| fun part1(input: List<String>): Int { | ||
| val array = input.map { it.toCharArray() }.toTypedArray() | ||
| val contraption = Contraption(array) | ||
| contraption.followLightBeam(0, 0, 0, 1) | ||
| return contraption.energizedTiles() | ||
| } | ||
|
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||
| fun part2(input: List<String>): Int { | ||
| val array = input.map { it.toCharArray() }.toTypedArray() | ||
| val contraption = Contraption(array) | ||
| contraption.checkAllOptions() | ||
| return contraption.currentMax | ||
| } | ||
|
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| val testInput = parseLines("Day16_test") | ||
| check(part1(testInput) == 46) | ||
| check(part2(testInput) == 51) | ||
|
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| val input = parseLines("Day16") | ||
| println(part1(input)) | ||
| println(part2(input)) | ||
| } |
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| \.......-..|.....-.........\.|.\................................................-......................\.../.. | ||
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| Original file line number | Diff line number | Diff line change |
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| .|...\.... | ||
| |.-.\..... | ||
| .....|-... | ||
| ........|. | ||
| .......... | ||
| .........\ | ||
| ..../.\\.. | ||
| .-.-/..|.. | ||
| .|....-|.\ | ||
| ..//.|.... |