50 lines
1.5 KiB
Kotlin
50 lines
1.5 KiB
Kotlin
package be.vandewalleh.aoc.days
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import be.vandewalleh.aoc.utils.input.Day
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import be.vandewalleh.aoc.utils.input.Input
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import be.vandewalleh.aoc.utils.input.Text
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import be.vandewalleh.aoc.utils.input.createDay
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typealias Entry = Pair<String, String>
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typealias Entries = List<Entry>
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@Day(4)
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class Day04(@Text val input: Input<String>) {
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val entries = input.value.split("\n\n").map {
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it.split(" ", "\n").map { it.split(":").let { (k, v) -> k to v } }
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}
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private fun Entries.hasRequiredKeys() = map { it.first }
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.containsAll(listOf("byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"))
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fun part1() = entries.count { it.hasRequiredKeys() }
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private val hclRegex = Regex("#[0-9a-f]{6}")
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private val pidRegex = Regex("[0-9]{9}")
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private fun Entry.isValid() = let { (k, v) ->
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when (k) {
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"byr" -> v.toInt() in 1920..2002
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"iyr" -> v.toInt() in 2010..2020
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"eyr" -> v.toInt() in 2020..2030
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"hgt" -> when {
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v.endsWith("cm") -> v.removeSuffix("cm").toInt() in 150..193
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v.endsWith("in") -> v.removeSuffix("in").toInt() in 59..76
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else -> false
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}
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"hcl" -> v.matches(hclRegex)
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"ecl" -> v in arrayOf("amb", "blu", "brn", "gry", "grn", "hzl", "oth")
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"pid" -> v.matches(pidRegex)
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else -> true
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}
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}
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fun part2() = entries.count { it.hasRequiredKeys() && it.all { it.isValid() } }
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}
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fun main() = with(createDay<Day04>()) {
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println(part1())
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println(part2())
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}
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