Day 12 (but in JS :( )

Author: jkjustjoshing

2022/puzzle12.js

@@ -0,0 +1,120 @@
+const lines =
+  `abaaacccccccccaaaaaaccccccccccccccccaacccccccccccaacaaaaaaaaaaaaaaaaaccaaaaacccaaaaccccccccccccccccccccccccccccccccccccccccccccccccccccccccaaaaa
+abaaacccccccccaaaaaacccccccccccccccaaaaccccccccccaaaaaaaacaaaaaaaaaaaccaaaaaaccaaaacccccccccccccccccccccccccccccccccccccccccccccccccccccccaaaaaa
+abaaaccccccccccaaaaacccccccccccccccaaaacccccccccccaaaaacccaaaaaaaaaacccaaaaaacccaaccccccccccccccaaaaacccccccccccccccccccccccccccccccccccccaaaaaa
+abccccaaccccccaaaaacccccccccaaaaaccaaaaccccccccccccaaaaacaaaaaaaaacccccaaaaaccccccccccccccccccccaaaaacccccccccccccccccaaaccccaaaccccccccccaaacaa
+abcccaaaacccccaaaaacccccccccaaaaacccccccccccccccccaaacaaaaaaaaaacccccccaaaaacccccccccccccccccccaaaaaacccccccccccccccccaaaaccaaaaccccccccccccccaa
+abcccaaaaacacccccccccccccccaaaaaaccccccccccccccccccaaccaaaaacaaaaccccccccccccccccccccccccccccccaaaaaaccccccccccccccccccaaaaaaaacccccccccccccccaa
+abaaaaaaaaaacccccccccccccccaaaaaaccccccccccccccccccccccaaaacccaaaccccccccccccccccccccccccccccccaaaaaacccccccccccccccciiiiijaaaaccccccccccccccccc
+abaaaaaaaaaacccccccccccccccaaaaaacccccccccccccccccccccccccccccaaacccccccccccccccccccccccccccccccaaaccccccccccccccccciiiiiijjjaccccccccaaaccccccc
+abccaaaaaaccccccccccccccccccaaaccccccccccccccccccccccccccccccccacccccccccccaacccccccccccccccccccccccccccccccccccccciiiiioijjjjaaccccccaaaaaacccc
+abccaaaaaacccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccaaaaaacccccccccccccccccccccccccccccccccccciiinnooojjjjjaaccaaaaaaaacccc
+abccaaaaaacccccccccccccccccccccccccccccccccccccaacccccaacccccccccccccccccaaaaaacccccccccccccccccccccccccccaaaccccciiinnnoooojjjjjjkkkaaaaaaacccc
+abcaaaaaaaaccccccccccccccccccccccccccccccccccccaaaccaaaaaaccccaaacccccccccaaaacccccccccccccccccccccccccccccaaaaccciiinnnouooojjjjkkkkkaaaaaccccc
+abccaccccccccccccccccccaaccccccaccccccccccccaaaaaaaaaaaaaacccaaaacccccccccaaaacccccccccccccccccccccccccccaaaaaacchhinnnttuuooooookkkkkkkaaaccccc
+abccccccccccccccccccaacaaaccccaaaaaaaaccccccaaaaaaaacaaaaacccaaaacccccccccaccacccccccccccccccccccccccccccaaaaacchhhhnntttuuuooooppppkkkkcaaacccc
+abccccccccaaacccccccaaaaaccccccaaaaaaccccccccaaaaaacaaaaaccccaaaaccccccccccccccccccccccccccccaccccccccccccaaaaahhhhnnntttxuuuooppppppkkkcccccccc
+abccccccccaaaacccccccaaaaaaccccaaaaaaccaaacccaaaaaacaaaaaccccccccccccccaaccccccccccccccaaaaaaaacccccccccccaachhhhhnnnntttxxuuuuuuuupppkkkccccccc
+abccccccccaaaacccccaaaaaaaacccaaaaaaaacaaacacaaaaaaccccccccccccccccccccaacccccccccccccccaaaaaacccccccccccccchhhhmnnnntttxxxxuuuuuuupppkkcccccccc
+abacccccccaaaacccccaaaaacaaccaaaaaaaaaaaaaaaaaaccaacccccccccccccccccaaaaaaaaccccccccccccaaaaaaccccccccccccchhhhmmmntttttxxxxuyyyuvvpppklcccccccc
+abacccccccccccccccccacaaaccaaaaaaaaaaaaaaaaaaaccccccccccccccccccccccaaaaaaaacccccccccccaaaaaaaaccccccccccccgghmmmtttttxxxxxxyyyyvvvpplllcccccccc
+abaccccccccaacccccccccaaaccaaaaaaaacaaaaaaaaaaccccccccccccccccccccccccaaaaccccccccccccaaaaaaaaaaccccccaccccgggmmmtttxxxxxxxyyyyyvvppplllcccccccc
+SbaaaccccccaaacaaaccccccccaaaaaaaaacaaaaaaaaacccccccccccccccccccccccccaaaaacccccccccccaaaaaaaaaaaaacaaaccaagggmmmtttxxxEzzzzyyyvvppplllccccccccc
+abaacccccccaaaaaaacccccccaaaaaaacaaccaaaaaaaccccccccccccccaaaccccccccaaaaaacccccccccccacacaaacccaaaaaaacaaagggmmmsssxxxxxyyyyyvvvqqqlllccccccccc
+abaccccccccaaaaaaccacccaaaaaaaaacccccccaaaaaaccccccccccccaaaaccccccccaaccaacccccccccccccccaaaccccaaaaaaccaagggmmmssssxxwwyyyyyyvvqqqlllccccccccc
+abaccccccaaaaaaaaccaacaaaccaaaaaacccccaaaaaaaccccccccccccaaaaccccccccccaacccccccccccccccccaacccccaaaaaaaaaaggggmmmssssswwyywyyyyvvqqlllccccccccc
+abaccccccaaaaaaaaacaaaaacccaaaaaacccccaaacaaaccccccccccccaaaaccccccccaaaaaaccccccccccccaacccccccaaaaaaaaaaaaggggmmmossswwyywwyyvvvqqqllccccccccc
+abcccccccaaaaaaaaaacaaaaaacaaccccccccaaacccccccccccccccccccccccccccccaaaaaaccccccccccccaaaaacccaaaaaaaaaaaaaaggggoooosswwywwwwvvvvqqqmlccccccccc
+abccccccccccaaacaaaaaaaaaacccccccccccaaacaccccccccccccccccccccccccccccaaaaccccccccccccaaaaaccccaaacaaacccaaacagggfooosswwwwwrvvvvqqqqmmccccccccc
+abccccccccccaaacccaaaaaaaacccccccccaacaaaaacccccccccccccccccccccccccccaaaaccccccccccccaaaaaacccccccaaacccaaccccfffooosswwwwrrrrrqqqqqmmccccccccc
+abccccccccccaacccccccaaccccccccccccaaaaaaaacccccccccccccaaccccccccccccaccaccccccccccccccaaaacccccccaacccccccccccfffoossrwrrrrrrrqqqqmmmccccccccc
+abccaaaccccccccccccccaacccccccccccccaaaaaccccccccccccaacaacccccccaaaaacccccccccccccccccaacccccccccccccccccccccccfffoossrrrrrnnnmqqmmmmmccccccccc
+abcaaaaccccccccccccccccccccccccccccccaaaaacccccccccccaaaaacccccccaaaaacccaaaccccccccccccccccccccccccccccccccccccfffooorrrrrnnnnmmmmmmmccccaacccc
+abcaaaacccccccccccccccccccccccccccccaaacaaccccacccccccaaaaaaccccaaaaaaccccaaaccacccccccccccccccccccccccccccccccccffoooonnnnnnnnmmmmmmccccaaacccc
+abccaaacccccccccccccccccccccaaaaaccccaaccccaaaacccccaaaaaaaaccccaaaaaaccccaaaaaaaccccccccccccccccaccaccccccccccccfffooonnnnnnddddddddcccaaaccccc
+abccccccccccccccccccccccccccaaaaaccccccccccaaaaaacccaaaaacaacccaaaaaaaccaaaaaaaacccccccccccccccccaaaaccccccccccccfffeonnnnneddddddddddcaaacccccc
+abccccccccccaaaccccccccccccaaaaaacccccccccccaaaacccccacaaacccccaacaacccaaaaaaaaacccccccccccccccccaaaacccccccccccccffeeeeeeeeddddddddcccaaacccccc
+abcccccccccaaaaccccacccccccaaaaaaccccccccccaaaaacccccccaaaacccaaacaccccaaaaaaaaaccccccccccccccccaaaaaaccccccccccccceeeeeeeeedacccccccccccccccccc
+abaccccccccaaaaccccaaacaaacaaaaaaccccccccccaacaaccccccccaaaacaaaacaaacaaaaaaaaaacccccccccccccaacaaaaaacccccccccccccceeeeeeeaaacccccccccccccccaaa
+abaaacccccccaaaccccaaaaaaaccaaaccccccccaaacccccccccccccccaaaaaaaacaaaaaaaaaaaaaaacacaaccaaacaaacccaacccccccccccccccccaacccaaaacccccccccccccccaaa
+abaaaccccccccccccccaaaaaaccccccccccccccaaacccccccccccccccaaaaaaaccaaaaaaccaacccaccaaaaccaaaaaaaccccccccaaccccccccccccccccccaaacccccccccccccccaaa
+abaaccccccccccccccaaaaaaacccccccccccaaaaaaaaccccccccccccccaaaaaaaaaaaaaacaaaccccccaaaaaccaaaaaaccccccaaaaccccccccccccccccccaaaccccccccccccaaaaaa
+abaaaccccccccccccaaaaaaaaaacccccccccaaaaaaaacccccccccccaaaaaaaaaaaaaaaaaaacccccccaaaaaacaaaaaaaaaccccaaaaaacccccccccccccccccccccccccccccccaaaaaa`.split(
+    "\n"
+  );
+
+// const lines = `Sabqponm
+// abcryxxl
+// accszExk
+// acctuvwj
+// abdefghi`.split("\n");
+
+const grid = lines.map((line, y) => {
+  return line.split("").map((cell, x) => {
+    let char;
+    if (cell === "S") {
+      char = "a";
+    } else if (cell === "E") {
+      char = "z";
+    } else {
+      char = cell;
+    }
+    height = char.charCodeAt() - "a".charCodeAt();
+
+    const obj = {
+      x,
+      y,
+      height,
+      isEnd: cell === "E",
+    };
+    return obj;
+  });
+});
+
+const find = (grid, startingCoordinates) => {
+  let searchTail = [grid[startingCoordinates.y][startingCoordinates.x]];
+  searchTail[0].visited = true;
+  searchTail[0].visitedIn = 0;
+
+  // For each loop, find all the not-yet-visited tails that aren't dead ends
+  const _size = grid.length * grid[0].length;
+  for (let i = 0; i < _size; ++i) {
+    searchTail = searchTail.flatMap((tail) => {
+      // Look left, right, up, down for candidates
+      const candidates = [
+        grid[tail.y][tail.x - 1],
+        grid[tail.y + 1]?.[tail.x],
+        grid[tail.y - 1]?.[tail.x],
+        grid[tail.y][tail.x + 1],
+      ].filter((a) => a && !a.visited & (a.height <= tail.height + 1));
+      candidates.forEach((c) => {
+        c.visited = true;
+        c.visitedIn = tail.visitedIn + 1;
+      });
+      return candidates;
+    });
+    const end = searchTail.find((s) => s.isEnd);
+    if (end) {
+      const visitedIn = end.visitedIn;
+
+      grid.forEach((r) => {
+        r.forEach((c) => {
+          delete c.visited;
+          delete c.visitedIn;
+        });
+      });
+      return visitedIn;
+    }
+  }
+};
+
+console.log("Part 1: " + find(grid, { x: 0, y: 0 }));
+const aDistances = grid
+  .flatMap((row) => {
+    return row.filter((r) => r.height === 0);
+  })
+  .map((cell) => {
+    return find(grid, cell);
+  })
+  .filter((cell) => cell);
+console.log("Part 2: " + Math.min(...aDistances));