From f703a5f028ebaa324d90dcd56c42fa295b3fe259 Mon Sep 17 00:00:00 2001 From: Christian Date: Mon, 16 Dec 2024 12:17:01 +0100 Subject: [PATCH] Day 16 --- aoc/src/dev/ctsk/aoc/Grid.scala | 4 + aoc/src/dev/ctsk/aoc/Main.scala | 3 +- aoc/src/dev/ctsk/aoc/days/Day16.scala | 65 ++++++++++++ data/16.ans | 2 + data/16.in | 141 ++++++++++++++++++++++++++ 5 files changed, 214 insertions(+), 1 deletion(-) create mode 100644 aoc/src/dev/ctsk/aoc/days/Day16.scala create mode 100644 data/16.ans create mode 100644 data/16.in diff --git a/aoc/src/dev/ctsk/aoc/Grid.scala b/aoc/src/dev/ctsk/aoc/Grid.scala index 570c15d..1d9345d 100644 --- a/aoc/src/dev/ctsk/aoc/Grid.scala +++ b/aoc/src/dev/ctsk/aoc/Grid.scala @@ -11,6 +11,9 @@ case class Point(x: Int, y: Int): def *(n: Int): Point = Point(n * x, n * y) def reduce: Point = { val g = gcd(x.abs, y.abs); Point(x / g, y / g) } +val directions = + Seq(Direction.Up, Direction.Right, Direction.Down, Direction.Left) + object Direction: def from(c: Char): Direction = c match @@ -43,6 +46,7 @@ enum Direction: case Left => Right case class Pose(pos: Point, dir: Direction): + def turnLeft: Pose = Pose(pos, dir.turnLeft) def turnRight: Pose = Pose(pos, dir.turnRight) def step: Pose = Pose(dir(pos), dir) def step(n: Int): Pose = Pose(dir.applyN(pos, n), dir) diff --git a/aoc/src/dev/ctsk/aoc/Main.scala b/aoc/src/dev/ctsk/aoc/Main.scala index ceaef97..f4957ce 100644 --- a/aoc/src/dev/ctsk/aoc/Main.scala +++ b/aoc/src/dev/ctsk/aoc/Main.scala @@ -17,7 +17,8 @@ val solvers = Map[Int, Solver]( 12 -> Day12, 13 -> Day13, 14 -> Day14, - 15 -> Day15 + 15 -> Day15, + 16 -> Day16 ) def runSolver(solver: Solver, input: os.Path): Unit = diff --git a/aoc/src/dev/ctsk/aoc/days/Day16.scala b/aoc/src/dev/ctsk/aoc/days/Day16.scala new file mode 100644 index 0000000..d2e1570 --- /dev/null +++ b/aoc/src/dev/ctsk/aoc/days/Day16.scala @@ -0,0 +1,65 @@ +package dev.ctsk.aoc.days + +import dev.ctsk.aoc.{Direction, *} + +import scala.collection.mutable + +object Day16 extends Solver(16): + override def run(input_ : os.ReadablePath): (Timings, Solution) = + val (pre_time, grid) = timed { + Grid(os.read.lines(input_).map(_.toArray).toArray) + } + + val start = grid.findFirst(_ == 'S').get + val end = grid.findFirst(_ == 'E').get + + case class State(distance: Int, pose: Pose) + implicit def ord: Ordering[State] = Ordering.by(-1 * _.distance) + + Direction.Up.ordinal + + def search(start: Pose): (Map[Pose, Int], Map[Pose, List[Pose]]) = + val distance = mutable.Map(start -> 0) + val ancestor = mutable.Map.empty[Pose, List[Pose]] + val heap = mutable.PriorityQueue(State(0, start)) + + inline def relax(u: Pose, v: Pose, vDist: Int): Unit = + val oldDist = distance.getOrElse(v, 1_000_000) + if vDist == oldDist then ancestor(v) +:= u + if vDist < oldDist then + ancestor(v) = List(u) + distance(v) = vDist + heap.enqueue(State(vDist, v)) + + while heap.nonEmpty do + val State(uDist, u) = heap.dequeue() + if uDist == distance(u) then + if !grid(u.step.pos).contains('#') then relax(u, u.step, uDist + 1) + for (v <- Seq(u.turnLeft, u.turnRight)) do relax(u, v, uDist + 1000) + + (distance.toMap, ancestor.toMap) + + val (p1_time, (distance, ancestor)) = timed { + search(Pose(start, Direction.Right)) + } + + val endPose = directions.map(Pose(end, _)).minBy(distance(_)) + + val p1 = distance(endPose) + + val (p2_time, p2) = timed { + val all = mutable.Set(endPose) + var cur = Set(endPose) + + println(start) + while cur.nonEmpty do + cur = cur.filter(_ != Pose(start, Direction.Right)).flatMap(ancestor(_)) + all.addAll(cur) + + all.map(_.pos).size + } + + ( + Timings(0, p1_time, p2_time), + Solution(Int.box(p1), Int.box(p2)) + ) diff --git a/data/16.ans b/data/16.ans new file mode 100644 index 0000000..f247ae7 --- /dev/null +++ b/data/16.ans @@ -0,0 +1,2 @@ +106512 +563 diff --git a/data/16.in b/data/16.in new file mode 100644 index 0000000..60044e3 --- /dev/null +++ b/data/16.in @@ -0,0 +1,141 @@ 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