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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,41 @@ | ||
| package adventofcode.year2024 | ||
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| import adventofcode.Puzzle | ||
| import adventofcode.PuzzleInput | ||
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| class Day04CeresSearch(customInput: PuzzleInput? = null) : Puzzle(customInput) { | ||
| override fun partOne() = WordSearch(input).countXmas() | ||
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| companion object { | ||
| private data class WordSearch( | ||
| val grid: List<List<Char>>, | ||
| ) { | ||
| private val rows = grid.size | ||
| private val cols = grid.first().size | ||
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| fun countXmas(): Int { | ||
| val xmas = "XMAS" | ||
| val length = xmas.length | ||
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| return (0 until rows).flatMap { row -> | ||
| (0 until cols).flatMap { col -> | ||
| val horizontal = (0 until length).map { y -> row to col + y }.filter { (_, y) -> y < cols } | ||
| val vertical = (0 until length).map { x -> row + x to col }.filter { (x, _) -> x < rows } | ||
| val rightDiagonal = (0 until length).map { d -> row + d to col + d }.filter { (x, y) -> x < rows && y < cols } | ||
| val leftDiagonal = (0 until length).map { d -> row + d to col - d }.filter { (x, y) -> x < rows && y >= 0 } | ||
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| setOf(horizontal, vertical, rightDiagonal, leftDiagonal) | ||
| .filter { candidate -> candidate.size == length } | ||
| .map { coordinates -> coordinates.map { (x, y) -> grid[x][y] }.joinToString("") } | ||
| } | ||
| } | ||
| .filter { candidate -> candidate == xmas || candidate == xmas.reversed() } | ||
| .size | ||
| } | ||
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| companion object { | ||
| operator fun invoke(input: String) = WordSearch(input.lines().map { row -> row.toList() }) | ||
| } | ||
| } | ||
| } | ||
| } |
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