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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,28 @@ | ||
| package adventofcode.year2024 | ||
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| import adventofcode.Puzzle | ||
| import adventofcode.PuzzleInput | ||
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| class Day19LinenLayout(customInput: PuzzleInput? = null) : Puzzle(customInput) { | ||
| private val patterns by lazy { input.lines().first().split(", ") } | ||
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| private val designs by lazy { input.lines().drop(2) } | ||
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| override fun partOne() = designs.count { design -> design.patternCombinations(patterns) > 0 } | ||
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| companion object { | ||
| private fun String.patternCombinations( | ||
| patterns: List<String>, | ||
| cache: MutableMap<String, Long> = mutableMapOf(), | ||
| ): Long = | ||
| when { | ||
| isEmpty() -> 1 | ||
| else -> | ||
| cache.getOrPut(this) { | ||
| patterns.filter { pattern -> startsWith(pattern) }.sumOf { pattern -> | ||
| removePrefix(pattern).patternCombinations(patterns, cache) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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