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Day 6: part 1 WIP
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‎src/main/scala/Day06.scala‎

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import Day06.Cell.*
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import Day06.Direction.*
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import cats.data.Store
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import cats.derived.*
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import cats.syntax.all.*
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object Day06:
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case class Pos(row: Int, col: Int):
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def left: Pos = Pos(row, col - 1)
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def up: Pos = Pos(row - 1, col)
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def right: Pos = Pos(row, col + 1)
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def down: Pos = Pos(row + 1, col)
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def next(dir: Direction): Pos = dir match {
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case Left => left
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case Up => up
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case Right => right
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case Down => down
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}
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enum Direction:
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case Left, Up, Right, Down
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def turnedRight: Direction = this match {
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case Left => Up
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case Up => Right
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case Right => Down
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case Down => Left
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}
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object Direction:
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def parse(c: Char): Option[Direction] = c match {
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case '<' => Left.some
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case '^' => Up.some
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case '>' => Right.some
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case 'v' => Down.some
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case _ => None
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}
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enum Tile:
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case Empty, Obstruction
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enum Cell:
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case TileCell(tile: Tile)
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case GuardCell(direction: Direction)
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type LabWithNoGuardStore = Store[Pos, Option[Tile]]
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type LabStore = Store[Pos, Option[(Tile, Guard)]]
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def extractGuard(store: LabStore): Option[Guard] = store.extract.map(_._2)
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case class Guard(pos: Pos, direction: Direction):
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def updated(store: LabStore): Option[Guard] =
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val nextPos = pos.next(direction)
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store
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.peek(nextPos)
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.map(_._1 match {
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case Tile.Empty => Guard(nextPos, direction)
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case Tile.Obstruction => Guard(pos, direction.turnedRight)
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})
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case class Lab(cells: List[List[Cell]], guard: Guard):
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val toVectors: Vector[Vector[Cell]] = cells.map(_.toVector).toVector
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val outOfBoundsPos: Pos = Pos(row = -1, col = -1)
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val toStoreWithNoGuard: LabWithNoGuardStore =
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Store(
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p =>
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toVectors
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.get(p.row)
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.flatMap(_.get(p.col).map {
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case TileCell(tile) => tile
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case GuardCell(_) => Tile.Empty
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}),
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s = guard.pos
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)
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def withGuard(store: LabWithNoGuardStore): LabStore = store.map(_.map((_, guard)))
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def step(store: LabStore): LabStore =
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extractGuard(store).fold(ifEmpty = store) { oldGuard =>
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oldGuard
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.updated(store)
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.map(newGuard => store.seek(newGuard.pos).map(_.map((tile, _) => (tile, newGuard))))
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.getOrElse(store.seek(outOfBoundsPos)) // TODO: improve! 🔥🔥🔥
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}
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def allDistinctGuardPositions(store: LabWithNoGuardStore): List[Pos] =
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List
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.unfold(init = withGuard(store))(currentStore =>
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extractGuard(currentStore).map(guard => (guard.pos, step(currentStore)))
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)
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.distinct
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object Lab:
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def parse(rows: List[String]): Option[Lab] = ??? // rows.map(_.toList)

‎src/test/scala/Day06Suite.scala‎

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import Day06.*
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import Day06Suite.*
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import munit.ScalaCheckSuite
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import org.scalacheck.Gen
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import org.scalacheck.Prop.*
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class Day06Suite extends ScalaCheckSuite:
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test("42 == 42"):
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assertEquals(42, 42)
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object Day06Suite:
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val bigInput: List[String] = getLinesFromFile("src/test/scala/day06_input.txt")

‎src/test/scala/day06_input.txt‎

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