diff --git a/Day14.scala b/Day14.scala new file mode 100644 index 0000000..bb44e76 --- /dev/null +++ b/Day14.scala @@ -0,0 +1,69 @@ +package aoc.day14 + +import aoc._ +import scala.collection.mutable + +type Board = Seq[Seq[Char]] + +val board = lines.map(_.toSeq).toSeq + +enum Direction { case Up, Down, Left, Right } +import Direction._ + +extension (board: Board) + inline def doTiltLeft(inline before: Board => Board, inline after: Board => Board): Board = + after(before(board).map { col => + col + .splitBy(_ == '#') // split by tilted rocks + .map { group => + val (rocks, empty) = group.partition(_ == 'O') + (rocks ++ empty).mkString + } + .mkString("#") + .toSeq + }) + + def doTilt(direction: Direction): Board = direction match + case Up => doTiltLeft(_.transpose, _.transpose) + case Down => doTiltLeft(_.transpose.map(_.reverse), _.map(_.reverse).transpose) + case Left => doTiltLeft(identity, identity) + case Right => doTiltLeft(_.map(_.reverse), _.map(_.reverse)) + + def cycle = Seq(Up, Left, Down, Right).foldLeft(board)(_.doTilt(_)) + + def load = + board.reverse // rows in reverse + .zipWithIndex.map { case (row, idx) => row.count(_ == 'O') * (idx + 1L) }.sum + +// part 1 + +def part1 = + println(board.doTilt(Up).load) + +// part 2 + +object Cycling: + private val memo = mutable.Map.empty[(Board, Int), Board] + private def getPower(b: Board, p: Int): Board = // b.cycle 2^p times + memo.getOrElseUpdate( + (b, p), { + if p == 0 then b.cycle + else getPower(getPower(b, p - 1), p - 1) + } + ) + + def apply(b: Board, times: Long): Board = + @scala.annotation.tailrec + def loop(b: Board, i: Int): Board = + val pow = 1L << i + if pow > times then b + else if (pow & times) > 0 then loop(getPower(b, i), i + 1) + else loop(b, i + 1) + loop(b, 0) + +def part2 = + println(Cycling(board, 1_000_000_000).load) + +@main def Day14(part: Int) = part match + case 1 => part1 + case 2 => part2 diff --git a/inputs/day14.input b/inputs/day14.input new file mode 100644 index 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