Day 20 slooooow

aoc/src/dev/ctsk/aoc/Grid.scala

@@ -10,6 +10,7 @@ case class Point(x: Int, y: Int):
   def -(o: Point): Point = Point(x - o.x, y - o.y)
   def *(n: Int): Point = Point(n * x, n * y)
   def reduce: Point = { val g = gcd(x.abs, y.abs); Point(x / g, y / g) }
+  def manhattan: Int = x.abs + y.abs
 
 val DIRS = Seq(Direction.Up, Direction.Right, Direction.Down, Direction.Left)
 

aoc/src/dev/ctsk/aoc/Main.scala

@@ -21,7 +21,8 @@ val solvers = Map[Int, Solver](
   16 -> Day16,
   17 -> Day17,
   18 -> Day18,
-  19 -> Day19
+  19 -> Day19,
+  20 -> Day20
 )
 
 def runSolver(solver: Solver, input: os.Path): Unit =

aoc/src/dev/ctsk/aoc/days/Day20.scala

@@ -0,0 +1,47 @@
+package dev.ctsk.aoc.days
+
+import dev.ctsk.aoc.*
+
+import collection.parallel.CollectionConverters.*
+
+object Day20 extends Solver(20):
+  private def manhattanBall(dist: Int, center: Point): Array[(Point, Int)] =
+    (for
+      x <- -dist to dist
+      y <- -(dist - x.abs) to (dist - x.abs)
+    yield (Point(center.x + x, center.y + y), x.abs + y.abs)).toArray
+
+  override def run(input: os.ReadablePath): (Timings, Solution) =
+    val grid = Grid(os.read.lines(input).map(_.toArray).toArray)
+    val start = grid.findFirst(_ == 'S').get
+    val end = grid.findFirst(_ == 'E').get
+
+    val trace = Iterator
+      .unfold((end, end))((cur, prev) =>
+        val n = DIRS.map(_(cur)).filter(_ != prev).find(!grid(_).contains('#'))
+        n.map(nxt => (cur, (nxt, cur)))
+      )
+      .concat(Seq(start))
+      .toArray
+
+    val distance = trace.zipWithIndex.toMap
+
+    def cheats(radius: Int): Int =
+      trace.zipWithIndex.par
+        .map((from, fromDist) => {
+          (for
+            (to, dist) <- manhattanBall(radius, from)
+            toDist <- distance.get(to)
+            cheat = fromDist - toDist
+            if cheat >= 100 + dist
+          yield ()).length
+        })
+        .sum
+
+    val p1 = timed { cheats(2) }
+    val p2 = timed { cheats(20) }
+
+    (
+      Timings(0, p1._1, p2._1),
+      Solution(Int.box(p1._2), Int.box(p2._2))
+    )

data/20.ans

@@ -0,0 +1,2 @@
+1445
+1008040

data/20.in

@@ -0,0 +1,141 @@
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