Advent of Code 2024 Go - Day 5: Print Queue

[@WayneBagguley]

Part 1: fun calc(input: List): Int { val rules = input[0].split(" ").groupBy({ it.split("|")[0] }) { it.substringAfter("|") } val updates = input[1].split(" ").map { it.split(",") } return updates.filter { isValid(rules, it) }.sumOf { it[it.size/2].toInt() } } private fun isValid(rules: Map, update: List): Boolean = update.map { s -> update.dropWhile { it != s } }.dropLast(1).all { l -> l.drop(1).all { rules[l.first()]?.contains(it) == true } } Part 2: fun calc(input: List): Int { val rules = input[0].split(" ").groupBy({ it.split("|")[0] }) { it.substringAfter("|") } val incorrect = input[1].split(" ").map { it.split(",") }.filter { !isValid(rules, it) } val sorted = incorrect.map { it.sortedWith { a, b -> if (rules[a]?.contains(b) == true) 1 else if (rules[b]?.contains(a) == true) -1 else 0 } } return sorted.sumOf { it[it.size/2].toInt() } } private fun isValid(rules: Map, update: List): Boolean = update.map { s -> update.dropWhile { it != s } }.dropLast(1).all { l -> l.drop(1).all { rules[l.first()]?.contains(it) == true } } I 💜 Kotlin!