Solver 20.1

20/20.py

@@ -0,0 +1,137 @@
+tiles = """
+Tile 2311:
+..##.#..#.
+##..#.....
+#...##..#.
+####.#...#
+##.##.###.
+##...#.###
+.#.#.#..##
+..#....#..
+###...#.#.
+..###..###
+
+Tile 1951:
+#.##...##.
+#.####...#
+.....#..##
+#...######
+.##.#....#
+.###.#####
+###.##.##.
+.###....#.
+..#.#..#.#
+#...##.#..
+
+Tile 1171:
+####...##.
+#..##.#..#
+##.#..#.#.
+.###.####.
+..###.####
+.##....##.
+.#...####.
+#.##.####.
+####..#...
+.....##...
+
+Tile 1427:
+###.##.#..
+.#..#.##..
+.#.##.#..#
+#.#.#.##.#
+....#...##
+...##..##.
+...#.#####
+.#.####.#.
+..#..###.#
+..##.#..#.
+
+Tile 1489:
+##.#.#....
+..##...#..
+.##..##...
+..#...#...
+#####...#.
+#..#.#.#.#
+...#.#.#..
+##.#...##.
+..##.##.##
+###.##.#..
+
+Tile 2473:
+#....####.
+#..#.##...
+#.##..#...
+######.#.#
+.#...#.#.#
+.#########
+.###.#..#.
+########.#
+##...##.#.
+..###.#.#.
+
+Tile 2971:
+..#.#....#
+#...###...
+#.#.###...
+##.##..#..
+.#####..##
+.#..####.#
+#..#.#..#.
+..####.###
+..#.#.###.
+...#.#.#.#
+
+Tile 2729:
+...#.#.#.#
+####.#....
+..#.#.....
+....#..#.#
+.##..##.#.
+.#.####...
+####.#.#..
+##.####...
+##..#.##..
+#.##...##.
+
+Tile 3079:
+#.#.#####.
+.#..######
+..#.......
+######....
+####.#..#.
+.#...#.##.
+#.#####.##
+..#.###...
+..#.......
+..#.###...
+""".strip().split("\n\n")
+
+
+with open("input") as f:
+    tiles = f.read().strip().split("\n\n")
+
+
+tiles = [tile.split("\n") for tile in tiles]
+tiles = {int(tile[0][5:-1]): tile[1:] for tile in tiles}
+print(len(tiles[2311]), len(tiles[2311][0]))
+print(len(tiles))
+
+def borders(tile):
+    return [tile[0], tile[-1], ''.join(tilex[0] for tilex in tile), ''.join(tilex[-1] for tilex in tile)]
+
+d = {i: [False]*4 for i in tiles}
+for i, a in tiles.items():
+    ax = borders(a)
+    for j, b in tiles.items():
+        if i!=j:
+            b = borders(b)
+            for k, axx in enumerate(ax):
+                for bx in b:
+                    if axx==bx or axx==bx[::-1]:
+                        d[i][k] = True
+                        break
+
+from math import prod
+print(prod(i for i, v in d.items() if v.count(False)==2))