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Reuse part 1 by literal string splitting
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31 changes: 8 additions & 23 deletions
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kt/aoc2024-lib/src/commonMain/kotlin/com/github/ephemient/aoc2024/Day3.kt
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Original file line number | Diff line number | Diff line change |
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@@ -1,31 +1,16 @@ | ||
package com.github.ephemient.aoc2024 | ||
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class Day3(private val input: String) { | ||
fun part1(): Int = regex1.findAll(input).sumOf { match -> | ||
val (x, y) = match.destructured | ||
x.toInt() * y.toInt() | ||
} | ||
fun part1(): Int = part1(input) | ||
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fun part2(): Int { | ||
var enable = true | ||
return regex2.findAll(input) | ||
.filter { match -> | ||
val (yes, no) = match.destructured | ||
enable = when { | ||
yes.isNotEmpty() -> true | ||
no.isNotEmpty() -> false | ||
else -> return@filter enable | ||
} | ||
false | ||
} | ||
.sumOf { match -> | ||
val (_, _, x, y) = match.destructured | ||
x.toInt() * y.toInt() | ||
} | ||
} | ||
fun part2(): Int = input.splitToSequence("do()").sumOf { part1(it.substringBefore("don't()")) } | ||
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companion object { | ||
private val regex1 = """mul\((\d+),(\d+)\)""".toRegex() | ||
private val regex2 = """(do\(\))|(don't\(\))|mul\((\d+),(\d+)\)""".toRegex() | ||
private val regex = """mul\((\d+),(\d+)\)""".toRegex() | ||
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private fun part1(input: String): Int = regex.findAll(input).sumOf { match -> | ||
val (x, y) = match.destructured | ||
x.toInt() * y.toInt() | ||
} | ||
} | ||
} |