Day 16: Reindeer Maze

Megathread guidelines

  • Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
  • You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL

FAQ

  • @mykl@lemmy.world
    3•7 hours ago

    Uiua

    Uiua’s new builtin path operator makes this a breeze. Given a function that returns valid neighbours for a point and their relative costs, and another function to test whether you have reached a valid goal, it gives the minimal cost, and all relevant paths. We just need to keep track of the current direction as we work through the maze.

    (edit: forgot the Try It Live! link)

    Data  ← ≡°□°/$"_\n_" "#################\n#...#...#...#..E#\n#.#.#.#.#.#.#.#^#\n#.#.#.#...#...#^#\n#.#.#.#.###.#.#^#\n#>>v#.#.#.....#^#\n#^#v#.#.#.#####^#\n#^#v..#.#.#>>>>^#\n#^#v#####.#^###.#\n#^#v#..>>>>^#...#\n#^#v###^#####.###\n#^#v#>>^#.....#.#\n#^#v#^#####.###.#\n#^#v#^........#.#\n#^#v#^#########.#\n#S#>>^..........#\n#################"
D₄    ← [1_0 ¯1_0 0_1 0_¯1]
End   ← ⊢⊚=@EData
Costs ← :∩▽⟜:≡(≠@#⊡:Data⊢).≡⊟⊙⟜(+1×1000¬≡/×=)+⟜:D₄∩¤°⊟
path(Costs|≍End⊙◌°⊟)⊟:1_0⊢⊚=@SData
&p ⧻◴≡⊢/◇⊂ &p :