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FlorianCassayreFlorianCassayre
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‎README.md

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@@ -21,7 +21,7 @@ _My solutions to the 2024 edition of [Advent of Code](https://adventofcode.com/2
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| **[03](https://adventofcode.com/2024/day/3)** | [solution](src/main/scala/adventofcode/solutions/Day03.scala) |
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| **[04](https://adventofcode.com/2024/day/4)** | [solution](src/main/scala/adventofcode/solutions/Day04.scala) |
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| **[05](https://adventofcode.com/2024/day/5)** | [solution](src/main/scala/adventofcode/solutions/Day05.scala) |
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| **[06](https://adventofcode.com/2024/day/6)** | [](src/main/scala/adventofcode/solutions/Day06.scala) |
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| **[06](https://adventofcode.com/2024/day/6)** | [solution](src/main/scala/adventofcode/solutions/Day06.scala) |
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| **[07](https://adventofcode.com/2024/day/7)** | [](src/main/scala/adventofcode/solutions/Day07.scala) |
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| **[08](https://adventofcode.com/2024/day/8)** | [](src/main/scala/adventofcode/solutions/Day08.scala) |
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| **[09](https://adventofcode.com/2024/day/9)** | [](src/main/scala/adventofcode/solutions/Day09.scala) |

‎input/06.txt

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‎output/06-1.txt

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‎output/06-2.txt

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‎src/main/scala/adventofcode/solutions/Day06.scala

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package adventofcode.solutions
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import adventofcode.Definitions.*
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@main def Day06 = Day(6) { (input, part) =>
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case class Vec(i: Int, j: Int):
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infix def +(that: Vec): Vec = Vec(i + that.i, j + that.j)
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def turnRight: Vec = Vec(j, -i)
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val (grid, initialPosition) =
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val matrix = input.toLines
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matrix.map(_.map {
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case '#' => false
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case _ => true
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}) -> matrix.indices.flatMap(i => matrix(i).indices.collect { case j if matrix(i)(j) == '^' => Vec(i, j) }).head
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val initialDirection = Vec(-1, 0)
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def inBounds(vec: Vec): Boolean = grid.indices.contains(vec.i) && grid(vec.i).indices.contains(vec.j)
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def visit(position: Vec, direction: Vec, history: Set[(Vec, Vec)], grid: IndexedSeq[IndexedSeq[Boolean]]): Option[Set[(Vec, Vec)]] =
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val key = (position, direction)
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if history.contains(key) then
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None
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else
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val nextHistory = history + key
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val nextCandidatePosition = position + direction
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if inBounds(nextCandidatePosition) then
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if grid(nextCandidatePosition.i)(nextCandidatePosition.j) then
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visit(nextCandidatePosition, direction, nextHistory, grid)
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else
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visit(position, direction.turnRight, nextHistory, grid)
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else
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Some(nextHistory)
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val explored = visit(initialPosition, initialDirection, Set.empty, grid).get
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part(1) = explored.map((p, _) => p).size
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val candidates = explored.map(_ + _).filter(inBounds).filter(p => grid(p.i)(p.j))
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part(2) = candidates.count(p => visit(initialPosition, initialDirection, Set.empty, grid.updated(p.i, grid(p.i).updated(p.j, false))).isEmpty)
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}

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