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2023 - Day 20 - part 1 and 2 - phuuu
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,41 +1,172 @@ | ||
| package no.rodland.advent_2023 | ||
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| import lcm | ||
| import no.rodland.advent.Day | ||
| import java.math.BigInteger | ||
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| // template generated: 20/12/2023 | ||
| // Fredrik Rødland 2023 | ||
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| class Day20(val input: List<String>) : Day<Long, Long, Map<String, Day20.Mod>> { | ||
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| private val parsed = input.parse() | ||
| val parsed = input.parse() | ||
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| override fun partOne(): Long { | ||
| return 2 | ||
| parsed.values.forEach { it.reset() } | ||
| repeat(1000) { sendPulse("button", Pulse.LOW) } | ||
| val high = parsed.values.sumOf { it.high } | ||
| val low = parsed.values.sumOf { it.low } | ||
| return high * low.toLong() | ||
| } | ||
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| override fun partTwo(): Long { | ||
| return 2 | ||
| parsed.values.forEach { it.reset() } | ||
| // rx gets a low pulse when nextToLast sends a low pulse | ||
| // nextToLast sends a low pulse when all beforeNextToLast are high | ||
| val nextToLast = parsed.values.single { it.destinations.contains("rx") } | ||
| val beforeNextToLast = parsed.values.filter { it.destinations.contains(nextToLast.id) }.map { it.id } | ||
| val periods = beforeNextToLast.associateWith { -1L }.toMutableMap() | ||
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| var count = 0L | ||
| while (true) { | ||
| val result = sendPulse("button", Pulse.LOW, periods, ++count) | ||
| if (result != 0L) { | ||
| return result | ||
| } | ||
| } | ||
| } | ||
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| private fun checkPart2(source: String, periods: MutableMap<String, Long>, pulse: Pulse, count: Long): Boolean { | ||
| if (source in periods) { | ||
| if (pulse == Pulse.HIGH && periods[source]!! == -1L) { | ||
| periods[source] = count | ||
| } | ||
| if (periods.values.all { it != -1L }) { | ||
| println("all found: $periods") | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
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| private fun sendPulse(mod: String, pulse: Pulse, periods: MutableMap<String, Long> = mutableMapOf(), count: Long = 0L): Long { | ||
| val deque = ArrayDeque<QueueElement>() | ||
| deque.addAll(parsed[mod]!!.pulse("button", pulse).map { QueueElement(mod, it.second, it.first) }) | ||
| while (deque.isNotEmpty()) { | ||
| deque.removeFirst().let { (source, pulse, destination) -> | ||
| if (checkPart2(source, periods, pulse, count)) return periods.values.map { it.toBigInteger() }.fold(BigInteger.ONE) { acc, i -> lcm(acc, i) }.toLong() | ||
| val dest = parsed[destination]!! | ||
| val addToQueue = dest.pulseWithCount(source, pulse) | ||
| deque.addAll(addToQueue.map { QueueElement(destination, it.second, it.first) }) | ||
| } | ||
| } | ||
| return 0L | ||
| } | ||
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| data class QueueElement(val source: String, val pulse: Pulse, val destination: String) | ||
| enum class Pulse { HIGH, LOW } | ||
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| sealed class Mod(val id: String, val destinations: List<String>) { | ||
| var high = 0 | ||
| var low = 0 | ||
| override fun toString(): String { | ||
| return "$id, $low, $high" | ||
| } | ||
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| fun reset() { | ||
| high = 0 | ||
| low = 0 | ||
| resetSub() | ||
| } | ||
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| fun pulseWithCount(source: String, pulse: Pulse): List<Pair<String, Pulse>> { | ||
| if (pulse == Pulse.HIGH) { | ||
| high++ | ||
| } else { | ||
| low++ | ||
| } | ||
| return pulse(source, pulse) | ||
| } | ||
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| abstract fun resetSub() | ||
| abstract fun pulse(source: String, pulse: Pulse): List<Pair<String, Pulse>> | ||
| } | ||
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| class FlipFlop(id: String, destinations: List<String>) : Mod(id, destinations) { | ||
| private var memory = false | ||
| override fun resetSub() { | ||
| memory = false | ||
| } | ||
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| override fun pulse(source: String, pulse: Pulse): List<Pair<String, Pulse>> { | ||
| return if (pulse == Pulse.LOW) { | ||
| val pulseToSend = if (!memory) Pulse.HIGH else Pulse.LOW | ||
| memory = !memory | ||
| destinations.map { it to pulseToSend } | ||
| } else { | ||
| emptyList() | ||
| } | ||
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| } | ||
| } | ||
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| data class Conjunction(val iD: String, val dest: List<String>, val sources: List<String> = emptyList()) : Mod(iD, dest) { | ||
| private val memory = sources.associateWith { Pulse.LOW }.toMutableMap() | ||
| override fun resetSub() { | ||
| memory.replaceAll { _, _ -> Pulse.LOW } | ||
| } | ||
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| override fun pulse(source: String, pulse: Pulse): List<Pair<String, Pulse>> { | ||
| memory[source] = pulse | ||
| val pulseToSend = if (memory.values.all { it == Pulse.HIGH }) { | ||
| Pulse.LOW | ||
| } else { | ||
| Pulse.HIGH | ||
| } | ||
| return destinations.map { it to pulseToSend } | ||
| } | ||
| } | ||
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| class Forwarder(iD: String, destinations: List<String>) : Mod(iD, destinations) { | ||
| override fun resetSub() {} | ||
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| override fun pulse(source: String, pulse: Pulse): List<Pair<String, Pulse>> = destinations.map { it to pulse } | ||
| } | ||
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| class NA(iD: String) : Mod(iD, emptyList()) { | ||
| override fun resetSub() {} | ||
| override fun pulse(source: String, pulse: Pulse): List<Pair<String, Pulse>> = emptyList() | ||
| } | ||
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| sealed class Mod(val id: String, val destinations: List<String>) | ||
| class FlipFlop(id: String, destinations: List<String>) : Mod(id, destinations) | ||
| class Broadcast(destinations: List<String>) : Mod("broadcaster", destinations) | ||
| class Conjunction(id: String, destinations: List<String>) : Mod(id, destinations) | ||
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| override fun List<String>.parse(): Map<String, Mod> { | ||
| return associate { line -> | ||
| println(line) | ||
| val mods = map { line -> | ||
| val (id, list) = line.split(" -> ") | ||
| val destinations = list.split(";", " ").filterNot { it.isEmpty() } | ||
| val destinations = list.split(";", " ", ",").filterNot { it.isEmpty() } | ||
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| val mod = when { | ||
| id.startsWith("&") -> Conjunction(id.drop(1), destinations) | ||
| id.startsWith("%") -> FlipFlop(id.drop(1), destinations) | ||
| id == "broadcaster" -> Broadcast(destinations) | ||
| id == "broadcaster" -> Forwarder("broadcaster", destinations) | ||
| else -> error("unknown mod: $id") | ||
| } | ||
| mod.id to mod | ||
| mod | ||
| } | ||
| val na = mods.flatMap { it.destinations }.distinct().filterNot { it in mods.map { it.id } }.map { | ||
| NA(it) | ||
| } | ||
| return (mods + na + Forwarder("button", listOf("broadcaster"))).map { mod -> | ||
| if (mod is Conjunction) { | ||
| mod.copy(sources = mods.filter { mod.id in it.destinations }.map { it.id }) | ||
| } else { | ||
| mod | ||
| } | ||
| }.associateBy { it.id } | ||
| } | ||
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| override val day = "20".toInt() | ||
| } |
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