Created
December 11, 2023 01:01
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AoC 2023 Day 6
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| package net.tazato | |
| import cats.* | |
| import cats.data.NonEmptyList | |
| import cats.effect.* | |
| import cats.parse.Parser as P | |
| import cats.parse.Numbers.digits | |
| import cats.parse.Rfc5234.lf | |
| import cats.parse.Rfc5234.wsp | |
| import cats.syntax.all.* | |
| object Day6 extends IOApp.Simple { | |
| val input = io.Source.fromResource("day6.txt").mkString | |
| def part1F(i: String) = IO.delay { | |
| Parse.all.parseAll(i) match | |
| case Left(value) => | |
| IO.raiseError(new Throwable(s"parse error:\n${value.show}")) | |
| case Right(value: NonEmptyList[(Int, Int)]) => | |
| val inputs = value.map(pair => 0 to pair._1) | |
| val poly = value.map[Int => Int] { case (time, record) => | |
| (hold: Int) => (time * hold) - (hold * hold) - record | |
| } | |
| val result = inputs | |
| .zip(poly) | |
| .map[Int] { case (input, poly) => | |
| val r = input.toList.map(poly).count(_ > 0) | |
| r | |
| } | |
| .foldLeft(1)(_ * _) | |
| result | |
| } | |
| def part2F(i: String) = IO.delay { | |
| Parse.allPart2.parseAll(i) match | |
| case Left(value) => | |
| IO.raiseError(new Throwable(s"parse error:\n${value.show}")) | |
| case Right(value) => | |
| val (allowed, record) = value | |
| val inputs = (0L to allowed).toList | |
| val poly = (hold: Long) => (allowed * hold) - (hold * hold) - record | |
| val result = inputs.map(poly).count(_ > 0) | |
| result | |
| } | |
| override def run: IO[Unit] = | |
| part2F(input).flatMap(r => IO.println(s"part2: $r")) | |
| object Parse { | |
| val times = | |
| P.string("Time:") *> digits.map(_.toInt).surroundedBy(wsp.rep0).rep | |
| val records = | |
| P.string("Distance:") *> digits.map(_.toInt).surroundedBy(wsp.rep0).rep | |
| val all = (times, lf.void, records).mapN((t, _, r) => t.zip(r)) | |
| val allPart2 = (times, lf.void, records).mapN { (t, _, r) => | |
| val time = t.foldLeft("")((acc, v) => acc ++ v.toString).toLong | |
| val record = r.foldLeft("")((acc, v) => acc ++ v.toString).toLong | |
| (time, record) | |
| } | |
| } | |
| } |
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| package net.tazato | |
| import cats.syntax.all.* | |
| import weaver.* | |
| object Day6Suite extends SimpleIOSuite { | |
| val example = | |
| """Time: 7 15 30 | |
| |Distance: 9 40 200""".stripMargin | |
| pureTest("parse example") { | |
| Day6.Parse.all.parseAll(example) match | |
| case Left(value) => failure(s"failed to parse\n${value.show}") | |
| case Right(value) => success | |
| } | |
| test("example works part 1") { | |
| Day6.part1F(example) map { result => | |
| expect(result == 288) | |
| } | |
| } | |
| pureTest("example works part 2") { | |
| Day6.Parse.allPart2.parseAll(example) match | |
| case Left(value) => failure(s"failed to parse\n${value.show}") | |
| case Right(value) => expect.same(value, (71530, 940200)) | |
| } | |
| } |
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