Plan for day 16 stands

day16/input

@@ -0,0 +1,141 @@
+#############################################################################################################################################
+#.......................#.....#...........#.......#...........#...#.....#.......#...#.........#.......#.#.................#...........#....E#
+#.#.#.#.#.#.#.###.#.###.#.#.###.#####.###.#####.###.###.#.#.#.#.#.#.#.#.#####.#.#.###.#.#####.#.#####.#.#.#######.#.#####.#.###.#######.#.#.#
+#.#.#.#.#.#.#...#.#.#.....#.#.......#...#.......#...#.#.........#.#.#.#.......#.#.....#...#.#.#.#...#.#.#.......#...#...#.#...#.........#.#.#
+#.#.#.#.#.#.###.#.#.#####.#.#.#######.#.#####.###.#.#.#.#.###.#.###.#.#######.#.#########.#.#.#.#.###.#.#####.#.###.###.#.#.#######.#####.#.#
+#.#.#.#.#...#.#.#.#.......#.....#...#.#.#.....#...#...#.#...#...#...#.....#...#...#...#...#.#...#.....#.#.........#...#.#.....#...#.....#...#
+#.#.#.#.###.#.#.#.###.#.#.#######.#.###.#######.###.###.#.#.#####.###.###.#.#####.#.#.#.###.#####.#####.#.###.#######.#.###.#.#.#.#########.#
+#.....................#...........#...#.#...#...#.....#...#.#.....#...#.#.#.....#.#.#...#.......#.....#...#.#.......#.#.....#...#.#...#...#.#
+#.###.#.#.#.#.#####.###########.#####.#.#.#.#.###.#.#.#####.#.#####.#.#.#.#####.#.#.#####.#####.#####.###.#.#.#####.#.#.#########.#.#.#.#.#.#
+#.#...#...#...#...#...#.........#.......#.........#...#...#...#.....#...#.....#.#.#...#.....#...#...#...#.#...................#.#...#.#.#.#.#
+#.#.###.#####.#.#####.#.#######.#.#######.#########.#.#.#######.###.###.#####.#.#.###.#.###.#.###.#####.#.#.#.#.###########.#.#.#####.#.#.#.#
+#.#.#...#...#.#.#.....#...#...#.#.#.......#.......#.#.#.....#.#...#.#...#...#.#.......#.#...#.....#.....#...#.......#.................#.#.#.#
+#.#.#.###.#.#.#.#.#.#####.#.#.#.###.#######.###.#.#.#.#.#.#.#.#.###.#.#####.#.###########.#########.#######.#.#####.#.#########.###.#.#.#.#.#
+#.#.#...#.#...#.#.#.#.....#.#...#...#.....#...#.#.#.#.#.#.#.#...#...............#.......#.#...#.....#.....#.......#.#.......#.#.....#.#.#...#
+#.#.###.#.#####.#.###.###.#.#####.###.#.#.#.###.#.#.#.#.#.#.#####.###.#.#######.###.#.#.#.#.#.#.#####.###.###.#####.#.#####.#.#####.#.#.###.#
+#.#...#...#.....#.......#...#.....#...#.#.#.#...#...#.#.#.#.......#.#.#.#.....#...#.#.#.#.#.#.........#.............#.#.....#...............#
+#.###.#######.#.#########.#.#.#####.###.###.#.#######.###.#########.#.#.#.###.###.#.#.#.#.#.#####.#####.#############.#.#####.###.#.#####.#.#
+#.....#...#...#.#.#.......#...#...#...#.....#.....#.#.....#.#...........#.#.#.#...#.#.#.#.#.#.....#...#.......#.......#.#...#.....#.........#
+#.#####.#.#.#.#.#.#.#######.#.#.#####.#########.#.#.#######.#.###.#####.#.#.#.#.###.#.#.#.#.#.#####.#.#.#####.#.#######.#.###.#.###.###.#.#.#
+#.......#...#...#.#.#...#...#.#.........#.....#.#.#.....#.....#...#...#.#.#...#...#.#.#...#.#.#...#.#.#.#...#...#.......#.....#.........#.#.#
+#.#.#########.#.#.#.#.#.#.###.#####.#.###.###.###.#.#####.#####.#.#.#.###.#.#####.#.#.###.#.#.#.#.#.#.#.###.#####.#######.#.###########.#.#.#
+#.#.....#.....#...#.#.#.#.....#.....#.#...#.......#.#.....#.....#.#.#...#.#.....#.#.#.#...#.#.#.#.#.#.............#.....#...#...............#
+#.###.#.#.###.###.#.#.#.###.###.#####.#.#.#########.#.#######.###.#.###.#.#####.#.###.#####.#.###.#.#########.#####.###.#.#.#.#.###.#.#.###.#
+#...#.#.#.........#...#.#...#...#...#.#.....#.......#...#...#.#...#...#.#...#.#.#...#...#...#.#...#.....#.....#.......#...#.#.#...#...#.....#
+###.###.#####.#########.#.###.#.#.#.#.#####.#.#########.#.#.#.#.#####.#.###.#.#.###.#.#.#.###.#.#####.###.###########.#####.#.###.#####.#.#.#
+#.......#.......#...#...#.#...#.#.#...#.....#.........#...#.#...#...#.#.....#.#.#...#.#...#...#.......#...#...........#...#.....#.........#.#
+#########.###.#.#.#.#.###.#.###.#.#####.#####.#######.#####.#.#.###.#.#######.#.#.###.#####.###.#.#.###.#####.#########.#.#####.#######.###.#
+#.........#...#.....#...#.#...#...#.....#.....#...........#.#.#.....#...#.....#...#...#.....#...#.#...#.....#.#...#...........#.#.....#...#.#
+#.#########.#.#####.###.#.###.#####.#####.#########.#.###.#.#.#####.###.#.#.#.#####.#####.###.###.#.#####.#.#.#.#.#.#.###.#.###.#.#.#.#.#.#.#
+#.#.......#.#...#...#...#.#.....#...#.....#.#.......#...#.#.#...#...#.....#.....#...#.....#.....#...#...#.#.#.#.#.........#.#...#.#.#.#.#.#.#
+#.###.#####.#.#.#.###.#.#.#.#####.###.#####.#.#.###.###.###.###.#.###.###.###.#.#.#.###.###.#.#######.#.#.#.#.#.#######.###.#.#####.#.#.#.#.#
+#...#.#.....#...#.#...#.#.#...#...#.#.#...#...#...#...#.....#...#...#...#.#.#.#...#.#...#...#.#.......#.#.#.....#...#...#...#.#.....#.#.#...#
+###.#.#.###.#.###.#.###.#.#####.###.#.#.#.###.###.###.#######.#########.#.#.#.#####.#.#.###.#.#.#######.#.#.#####.#.#.###.#.#.###.###.#.#####
+#.............#...#.#...#.....#...#.....#...#.#...#...#.......#.........#...#.......#.....#...#...#.#...#.#.......#.#.....#.#.....#...#.#...#
+#.###.###.#.###.###.#.#######.#.#.#.#######.#.#.###.###.###.#.#.###########.#############.#######.#.#.#############.#.#.#.#.#####.#####.#.#.#
+#...#...#.#...#.#...#...#.....#.#.#.#...#...#.#...#.#.#.#...#.#.#.#.....#...#.......#.....#.....#.#.#.#.....#.....#.#.#...#.....#.#.....#.#.#
+#.#.###.#.#.#.#.#.#######.#####.#.###.#.#.###.###.#.#.#.#.#####.#.#.###.#.#####.###.#.#####.###.#.#.#.###.#.#.###.#.#.#########.#.#.###.#.#.#
+#.#.#...#...#.#.#.......#...#...#.....#.#...#.#.#.#.#...#.....#.#...#.#...#...#.......#.....#.#...#.#.....#...#...#.#...#.....#...#.#.....#.#
+###.#.#.#.###.#.#######.###.#######.###.###.#.#.#.#.###.#####.#.###.#.#####.#.#.#######.#####.#####.###########.###.###.###.#####.#.#.#####.#
+#...#.....#...#.#.....#...#.#.....#.#...#...#...#.#...#.......#...#.........#.#...#.........#...#.......#.....#.#...#...#...#.....#.#.#...#.#
+#.#####.#.#.###.#.###.#.#.#.#.###.#.#.###.#####.#.###.#.#########.###########.###.#########.#.###.###.#.#.###.#.#.#.#.###.###.###.#.###.#.#.#
+#.#...#...#.#...#.#.....#.#...#.#.#.#.#...#.....#.#.#.#.........#.....#.....#...#...#...#...#.........#.#.#...#.....#.#.#.....#...#...#.#.#.#
+#.#.#.#.#.#.#.###.#######.#####.#.###.#.#########.#.#.#######.#.#####.#.###.###.###.#.#.#.###########.###.#.#########.#.#.#####.#####.#.#.#.#
+#...#.#...#...#.......#...#.....#.#...#.#...........................#.#...#...#.....#.#...#.........#.....#.#.........#...#.#...#...#...#...#
+#.###.#.#.#####.#####.#.###.###.#.#.###.#.#########################.#.###.###.#####.#.#####.#######.#######.#.#######.###.#.#.#.#.#.#######.#
+#.......#.......#.....#.#...#.#.#.#...#...#...#.....#.....#.....#...#...#.#...#.............#.....#.#...#...#...........#...#.#.#.#.......#.#
+#.#.###.#####.#.#.#####.#.###.#.#.#.#.#####.#.#.###.#.#.#.#.###.#.###.###.#.###.#######.#####.#.###.#.#.#.#####.#######.#####.###.###.#.###.#
+#.....#.#.....#.#.#...#.#.....#...#.#.......#.....#...#.#.....#...#.......#...#...#...#.....#.#.#...#.#.#.#.....#...#...#...#.....#...#.#...#
+#.#####.#.#####.#.#.#.#.#####.#######.###############.#############.###.#####.#####.#.#####.###.#.###.#.#.#.#####.#.#.###.#.#######.#####.###
+#...#...#.#...#.#.#.#...#...#.#.....#.#...............#...........#.....#...#.#...#.....#.....#.#...#.#...#...#...#.#.....#.#...#...#...#...#
+#.#.#.#.#.#.#.###.#.#####.###.###.#.###.#########.#.###.#########.#######.#.#.#.#.#.###.#####.#.###.#.#######.#.###.#######.#.#.#.###.#.###.#
+#.....#.....#...#.......#...#.....#.#...#.........#.#...#.....#.....#.....#.#...#.#...#.#...#...#...#.........#...#.....#.....#.#.#...#.....#
+#.#####.#######.#.#####.#.#.#######.#.###.#####.###.#.#####.#.#.###.#.#####.#####.###.#.#.#.###.#.#####.###.#.###.#####.#######.#.#.#########
+#.........#...#.#.....#.#.#.....#.#.#...#...#...#...#.#.....#.#...#...#.........#.....#...#.#.#.#...#.....#.#...#.#...#...#.#.....#.#.......#
+#.#####.#.###.#.#####.#.###.###.#.#.###.#.#.#.#####.#.###.#.#####.#############.###.#####.#.#.#.###.#.###.#.#.###.###.###.#.#.#####.###.###.#
+#.#.......#...#.#.....#...........#.....#.#...#.....#.....#.#...#.#.......#...#...........#.#.....#.......#...#.........#.#.....#...#...#...#
+#.#.#######.###.#.###########.###########.###.#.###.###.#.#.#.#.#.#.#####.###.#.#.#######.#.#####.#######.#####.#########.#######.###.###.###
+#.#...#...........#...#.......#...........#.#.....#...#...#.#.#...#...#.#...#...#.......#.#...#...#.....#.......#...#...#.........#.....#.#.#
+#.###.#############.#.#.#######.#######.###.#.###.###.#####.#.#######.#.###.#####.#####.#####.#.###.###.###.#####.#.#.#.#.#############.#.#.#
+#...#.#.........#...#.#...#.#...#.....#...#...#.#...#.#...#.#.......#...#...#.....#...#.......#...#...#...#...#...#...#.#.#.............#.#.#
+#.#.#.#.#######.#.###.###.#.#.###.###.###.#.###.###.###.#.#.#####.###.###.#.#.#####.#.###########.###.###.###.#.#######.#.#.#.#.#########.#.#
+#...#...#.....#.#...#.......#.#...........#.#.....#.....#...#...#.....#...#.#.#.#...#...........#.#.#...#.#...#...#...#.#.#...#...#.....#...#
+#.#######.#.###.#.#.#.#######.#.#.#####.###.#.###########.###.#.#######.###.#.#.#.#.#############.#.#.#.#.#.#####.#.###.#.#.#####.#.#.#####.#
+#...#.....#...#.#.#...#.......#.#.#...#.....#.#.........#...#.#.........#...#.#.#.#.......#...#.......#.#.#.#.....#.#...#.#.....#.#.#.......#
+###.#.#######.#.#######.#######.###.#.#.#####.#.#.#####.#####.#########.#####.#.#.#####.#.#.#.#.#######.#.###.#.###.#.#.#.#######.#.#########
+#.#.#...#.....#.......#.....#.....#.#...#.....#.#.#...........#.....#...#...#.#...#...#.#...#.....#.....#.....#.....#...#.......#.#.....#...#
+#.#.#####.#########.#.#####.#.###.#.#####.###.#.#.#.#.#.#######.#####.#.#.#.#.#.###.#.#.###########.#############.#.###.#######.#.#####.###.#
+#.#.....#.#.......#.#...#...#.#.#.#.#.....#...#.#.#.#.#...#...........#.#.#...#.#...#.#...#.....#...#.....#.......#...#.....#.#.............#
+#.#####.#.#.#.#.#.#####.#.###.#.#.#.#.#####.###.###.#.###.#.###########.#.#######.###.#.#.#.###.#.###.#####.#.###.###.#####.#.#######.###.#.#
+#.#.....#...#...#...#...#.#...#.#.#.#...#.#...#.....#...#...#...........#.........#.#...#.#.#.#.#.#...#.....#.#...........#.#.......#.#...#.#
+#.#.#########.#.###.#.###.#.###.#.#.###.#.###.#######.#.#.###.###############.#####.###.###.#.#.#.#.#.#.#####.#.#.#########.###.###.#.#.###.#
+#.#.#.......#.#.#.....#...#.....#.#.....#...#.#.....#.#.#.#.......#.....#...#.....#...#.....#.#...#.#.......#.#...#...#.....#...#.#...#.#...#
+#.#.###.###.#.#.###.###.#######.#.#######.#.#.#.###.#.#.#.#######.#.#####.#.#.#.#.#.#.#######.#######.#####.#.#.###.#.#.#####.###.###.#.###.#
+#...#...#.#...#...#...#.......#.#.#.......#.#.#...#.#.#.#.#...#...#.......#.#.#.#...#.....#.....#...#.....#.#.#.#...#...#.#.................#
+#.###.###.###.###.#.#.#######.###.#.#####.###.###.#.###.#.#.#.#.#.#########.#.#.#####.###.###.#.#.#.###.#.###.#.#.###.#.#.#.#.#########.#.#.#
+#.#...#.........#...#...#...#.#...#.....#.#.....#.#.#...#.#.#.#.#.....#.......#...#...#...#...#...#.....#.#...#...#.#.#.#...#.........#...#.#
+#.#.###.###.#.#.#######.#.#.#.#.#####.#.#.#.#####.#.#.###.#.#.#.#.#####.#####.#.#.###.#.###.#############.#.#######.#.#.#.###########.#####.#
+#.....................#.#.#...#.....#...#...#...#.#.#.#.#.#.#...#.#...#.#.#...#.#.......#.......#.........#...#.......#.#...#.......#...#...#
+#######.#.#.###.#.###.#.#.#####.#.###.#######.#.#.#.#.#.#.#.###.###.#.#.#.#.###.#.#.#.#.###.#.#.#.###########.#.#######.###.#####.###.#.#.###
+#.......#...#...#.#...#.#.#...#.......#...#...#.#.#.#.#...#...#.#...#...#...#...#.#.#.#...#.#.#...#...#.......#...#.....#.#.................#
+#.#.#####.###.###.###.#.#.#.###.#######.#.#.###.#.#.#.###.###.#.#.#######.#######.#.#.###.#.#.#.###.#.#.#.#.###.###.#####.#.#.#.#.#.#######.#
+#.#.#...............#...#.#...#.#.......#.#...#.#.#.#...#...#.#.#.#...#...#.......#.#.#...#.#.#...#.#.#...#...#.#...#.......#.#.#.#.....#...#
+#.#.#.#.#######.###.###.#.#.#.#.#.#####.#.#.#.#.#.#.###.###.#.#.#.#.###.###.#.#####.#.#.#####.###.#.#.#####.#.#.#.#######.#.#.#.#.#####.#.###
+#.............#...#.#...#.#.#...#...#...#.#.#.#...#.....#.....#.#.#...#...#.....#...#.#...#...#...#.#.......#...#.#.........#.#.....#...#...#
+#.#.#.#.#.#.#.###.#.#.###.#.#######.#.#.#.###.#.#########.#######.#.#.###.#.###.###.#####.#.###.###.#############.#.###.###.#.#.#####.#.###.#
+#.................#.#...#.#.......#.#.#.#.#...#.#.......#...#.....#.#...#.#...#.#...#...#.#.#...#...#.............#.....#...#.....#...#...#.#
+#.#.#######.###.###.###.#.#####.###.#.#.#.#.###.#.#####.#.#.#.#########.#.#.###.#.###.#.#.#.#.#.###.#.#############.###.#.###.###.#.#####.#.#
+#.....#...#...#.#...#...#.#.....#...#.#.#.#.#...#.#...#...#.#.#.........#.#.#...#.....#.#...#...#...#.....#...#...#.#.#...#.......#.#.....#.#
+#.###.#.#####.#.#.#######.#.###.#.###.###.#.#####.###.###.#.#.#.###.#####.#.#.###.#####.#######.#.#.#####.###.#.#.#.#.#########.###.#.#####.#
+#.#...#.....#...#.#.....#...#...#...#.....#.#...#.#...#...#.#.#...#...#...#.#...#.#...#.......#...#.....#...#.#.#...#.#.......#...#.#.#.....#
+#.#.###.#.#######.#.###.#####.###.#.#.#####.#.#.#.#.#.#.#.###.#.###.#.#.#####.#.#.#.#.#######.###.###.#####.#.#.#####.#.#.###.#.#.#.###.#####
+#...#...#...#.....#...#.......#...#.#.#.....#.#...#.#.#.#.#...#...#.#.......#.#.#.#.#.......#...#.#.........#.#.#.#.....#...#.#.#.#.....#...#
+#.#######.#.#.###.###.###.#########.#.#.###.#.#####.#.#.#.#.###.#.#########.###.#.#####.#.#.#.###.#.#########.#.#.#.#######.#.###.#########.#
+#.......#.#.#.#.....#.#...........#.#.#.#...#.#.....#.#.#.#.#...#.......#.......#.......#...#...#.#.#.........#.#.#.#.....#.#.....#.......#.#
+#.#####.###.#.#####.#.###.###.###.#.#.#.#####.#.#.###.#.###.###.#######.#############.#.###.###.#.#.#####.#####.#.#.#.#####.#####.#####.#.#.#
+#.....#.#...#.....#.#...#.#...#.....#.#...#...#.#...#.#.....#...#.......#.......#.......#.....#...#.....#.#...#.#.#.#.#.................#.#.#
+#.###.#.#.#.#####.#.###.###.#####.###.#.#.#.###.#.#.#.#######.###.#######.#####.#########.###.#########.#.#.#.#.#.#.#.#.#################.#.#
+#.....#.#.#...#.#.#...#.....#.....#...#.#.#.#...#...#.........#.#...#...#...#...................#.....#.#...#...#.#...#.#.......#.....#...#.#
+#.###.#.#.###.#.#.#########.#.###.###.#.#.#.#.###.#############.###.###.#.#.#########.###########.###.#.###.#####.###.#.#.#####.#####.#.###.#
+#.....#.#.#.#.#.#.#.....#...#.#.#...#...#.#.#.#...........#.......#...#...#...#...#.#...#.........#.#.#...#...#.......#.............#.#.#...#
+#.#.#.#.#.#.#.#.#.#.#.###.###.#.###.###.#.#.###.###.###.#.###.###.###.#######.#.#.#.###.#.#####.#.#.#.#.#.###.#####################.#.#.###.#
+#.#.#...#.#.....#...#.....#.#...#.#...#...#...#.........#.....#.....#.......#.#.#...#...#.#...#.....#.#.#.#.#.........#.....#...#...#.#.....#
+#.###.###.#################.###.#.###.#######.#######.###.#.#####.#########.#.#.#####.###.#.#######.#.###.#.#########.#.###.#.#.#.###.#####.#
+#.....#.......#...........#.#...#...#...#.....#.....#.#...#.#...#.#.....#.#...........#...#.........#.....#.........#...#.#...#...#...#.....#
+#.###.#######.#.#####.###.#.#.###.#.###.#.###.#.###.#.#.###.#.#.###.#.#.#.#####.#.#####.#####.###.#.#######.###.#########.#########.#.#.#####
+#...............#.#...#.......#.#.#...#...#.....#...#.#...#...#.....#.#.#.....#.#.....#.....#.#...#.........#...#.......#.....#.....#.#...#.#
+#####.#####.#.###.#.###.#####.#.#.###.###.#.#######.#####.###########.#.###.#.#.###.#.#####.#.#.#####.#######.###.###.###.###.#.###.#####.#.#
+#.......#...#.#...#.#...#.....#.....#.#.....#.....#.......#...........#.#...#.#...#.#.......#.#...#...#...#...#...#.#.....#.#...#.#.....#.#.#
+#.###.#.#.###.#.###.#.###.#####.###.#.#.#.###.###.#########.###########.#.#######.#.#########.###.#.###.#.#.###.###.#######.#####.#####.#.#.#
+#...#.#.#...#.#.#...#...#.#.....#...#...#.....#.#.....#.........#...#.#.#.#.......#...#.#.....#...#...#.#.#.....#.....#.......#...#.....#.#.#
+#.#.#.#.###.#.#.#.#####.#.###.###.#######.#####.#####.#.#.#####.#.#.#.#.#.#.#######.#.#.#.#####.#####.#.#.#####.#.###.#.#.#####.#.#.###.#.#.#
+#.#.#...#...#.#.#.#.....#...#...#.#.....#.#.........#...#.....#...#.#.#.#.#.#.....#.#.#.#...#.#.#.....#.#.......#...#...#.#.....#.#...#.#...#
+#.#.#####.###.#.#.#########.#.#.#.#.###.#.#####.#.#.###.###########.#.#.#.#.#.###.###.#.###.#.#.#######.###########.#####.#.#####.###.#####.#
+#.#.......#.....#.....#...#.#.#...#.#...#.#...#.#.#.#...#...#...#...........#...#.#...#.....#.#.#.....#...........#.....#.#...#.....#...#...#
+#.#########.#########.#.#.#.#######.#.###.#.#.###.###.###.#.#.#.#.#########.###.#.#.#####.###.#.#.###.#####.#.#.#######.#.###.#.#######.#.###
+#.........#.#.#.....#...#...........#.#.....#...#.#...#...#...#.#.#.........#...#...#...#...#.#...#.#.....#.#.#.....#...#.....#.....#...#.#.#
+###.#.#####.#.#.###.#####.###########.#########.#.#.###.#####.#.#.#.#########.#######.#.###.#.#####.#####.#.#.###.###.#############.#.#.#.#.#
+#.#.#.#.....#.#.#.#.......#.........#.....#.......#.#.#...#.....#.#.#...#.........#...#.#.....#.....#.....#.#...#.........#...............#.#
+#.#.#.#.#####.#.#.#######.#.#####.#######.#######.#.#.#.#.#.#.#.#.#.###.#.#######.#.###.#####.###.#.#.#####.#.#########.###.#####.#.#.###.#.#
+#...#.........#.#...#...#.#...#...#.....#...........#.#.#.#.#.#...#.#...#.#.....#...#.#.....#.#...#.#.......#.#.....#...#...#...#.#.#...#.#.#
+#.###########.#.#.#.#.#.#.#.#.#####.###.#############.#.#.#.#.#.###.#.###.#.#.#######.#####.#.#.###.#######.###.###.#####.###.###.#.###.#.#.#
+#.....#.....#...#.#...#...#.#.........#.............#...#.#.#...#...#.#...#.#...........#...#...#...#.............#.#.....#.....#.#...#...#.#
+#####.#.#.###.#.###.#.#####.#########.#####.#######.#####.#.#####.###.#.###.#####.#####.#.#######.#.#.#########.#.#.#.#####.###.#.###.#####.#
+#...#.#.#.....#...#.#.....#...#...#...#.....#.....#.#...#.#...#...#.....#...#.....#.#...#...#...#.........#.......#.#.....#.#...#.#.......#.#
+#.###.#########.#.#.#####.#.###.#.#####.#########.#.#.#.#.#####.###.#####.###.#####.#.#####.###.###.###.#.###.#####.#.###.###.#.#.#.#####.#.#
+#...#.........#.#.#.....#.#.#...#.#...#.#.......#.#...#.#.#.....#...#.....#...#.......#...#.#.....#.#...#.#...#.....#.#...#...#.#...#...#.#.#
+#.#.#########.#.#.#.#####.###.###.#.#.#.#.###.#.#.#####.#.#.###.#.#########.###.#########.#.#.###.#.#.###.#.###.#####.#.#.#.###.#######.#.#.#
+#.#.....#.....#.#.#.....#...#.#.#...#...#...#.#.#.....#.#.#.#.....#.........#.#...#.....#.#.#.......#...#.#.#...#.....#.#.....#...#.....#.#.#
+###.###.###.#.###.#.#.#.###.#.#.#########.###.#.#.#.###.#.#.#.#.#####.#######.###.###.#.#.#.###.#.###.###.#.#.###.#####.#.###.#####.#.###.#.#
+#...#.......#.....#.#...#.#...#...................#.#.....#.#.#.......#.........#.....#.#.#...#.....#.#...#.#...#...#...#...#.....#.#...#...#
+#.#########.#######.#.#.#.#########.#.#####.###.#####.#####.#.#.#######.#.#############.#.###.###.###.#.###.###.#.###.###.#.#####.#.###.###.#
+#.........#.#...#...#.#.......#.....#.#...#...#.#...#.#.....#.#.......#.#.......#.....#.#...#...#.#...#.#.....#.#.#...#.....#...#...#.#...#.#
+#.#######.#.#.#.#.###.#######.#.###.#.#.#####.###.#.#.#.#####.#.#####.#####.###.#.###.#.#.#.###.###.###.#.###.#.#.#.###.#.###.#######.#.###.#
+#.#.....#.#...#.#...#.......#...#...#...#.....#...#...........................#...#...#...#...#.....#.#.#.#.....#.#.........................#
+#.#.###.#.#########.#.#####.#.#######.###.#####.#######.#.#.#.#.#####.#.#.#######.#.#####.#####.#####.#.#.#####.#.###.###.#####.#.###.#######
+#.#.#...#.........#...................#...#.....#.....#...#.#.#.....#.#.#...#...#.#.......#...#.#.............................#.#.....#.....#
+#.#.#.#.#######.#.#.#.#.#######.#######.###.#####.#.#######.#.#.###.#.#.###.#.#.#####.###.#.#.#.#.#####.#.#.#####.#.###.#.#.#.#.#.###.#.###.#
+#.......#.#.....#.#...#.....#...#.....#.#...#.....#.#.......#.................#.#...#...#...#.#...#.....#.#.#.....#.#.#.....#.#.#...#.#.#...#
+#.###.#.#.#.#########.#####.#.###.###.#.#.###.#####.#.#########.#.#####.#.###.#.#.#.#####.###.#####.#####.#.#######.#.###.###.#.#.#.#.#.#.###
+#S....#...#...............#.......#...#.......#.....#...........#.......#.....#...#.......#.........#...............#...........#.#.....#...#
+#############################################################################################################################################

day16/main.go

@@ -0,0 +1,129 @@
+package main
+
+import (
+	"math"
+
+	"git.mstar.dev/mstar/goutils/sliceutils"
+
+	"git.mstar.dev/mstar/aoc24/util"
+)
+
+// A crossing is a path location with 3 or 4 other paths next to it
+type Crossing struct {
+	At          util.Vec2
+	LowestScore int
+	LowestFrom  int // Index into list of crossings
+}
+
+var (
+	DirUp    = util.Vec2{X: 0, Y: -1}
+	DirRight = util.Vec2{X: 1, Y: 0}
+	DirDown  = util.Vec2{X: 0, Y: 1}
+	DirLeft  = util.Vec2{X: -1, Y: 0}
+)
+
+var startDir = DirRight
+
+// Get the size of the bord
+func getSize(lines []string) util.Vec2 {
+	return util.Vec2{X: int64(len(lines[0])), Y: int64(len(lines))}
+}
+
+// Count the paths next to a given positon
+func countPathsAt(lines [][]rune, at util.Vec2) int {
+	center := lines[at.Y][at.X]
+	if center == '#' {
+		return 0
+	}
+	if center == 'E' {
+		return 1
+	}
+	if center == 'S' {
+		return 1
+	}
+	acc := 0
+	if util.SafeGet(lines, at.Up()) != '#' {
+		acc++
+	}
+	if util.SafeGet(lines, at.Down()) != '#' {
+		acc++
+	}
+	if util.SafeGet(lines, at.Left()) != '#' {
+		acc++
+	}
+	if util.SafeGet(lines, at.Right()) != '#' {
+		acc++
+	}
+	return acc
+}
+
+func findAllCrossings(lines [][]rune) []Crossing {
+	out := []Crossing{}
+
+	for iy, line := range lines {
+		for ix := range line {
+			vec := util.Vec2{X: int64(ix), Y: int64(iy)}
+			pathCount := countPathsAt(lines, vec)
+			if pathCount >= 3 {
+				out = append(out, Crossing{At: vec, LowestScore: math.MaxInt, LowestFrom: -1})
+			}
+		}
+	}
+
+	return out
+}
+
+// Convert a list of crossings into x y map of pointers to those crossings
+func crossingListToPointerMap(crossings []Crossing) map[int64]map[int64]*Crossing {
+	return nil
+}
+
+func findStart(lines [][]rune) util.Vec2 {
+	for iy, line := range lines {
+		for ix, char := range line {
+			if char == 'S' {
+				return util.Vec2{X: int64(ix), Y: int64(iy)}
+			}
+		}
+	}
+	// Return invalid positon if none found
+	return util.Vec2{X: -1, Y: -1}
+}
+
+func findEnd(lines [][]rune) util.Vec2 {
+	for iy, line := range lines {
+		for ix, char := range line {
+			if char == 'E' {
+				return util.Vec2{X: int64(ix), Y: int64(iy)}
+			}
+		}
+	}
+	// Return invalid positon if none found
+	return util.Vec2{X: -1, Y: -1}
+}
+
+func walk(area [][]rune, from util.Vec2, dir util.Vec2) {
+	// Idea: walk forward from start until crossing or wall
+	// At crossing, defer a walker for both sides (if not walled off) but prioritise forwards
+	// Keep track of current score, one crossing = 1 point
+	// walking length doesn't matter because negligable compared to turn cost
+	// At crossing, check if own score is lower than current score
+	// If it is, update score and set own origin
+
+	// Special case:
+	// If at end, update end "crossing" following the earlier rules
+}
+
+func main() {
+	inputLines := util.FileContentToNonEmptyLines(util.LoadFileFromArgs())
+	// size := getSize(inputLines)
+	area := sliceutils.Map(inputLines, func(t string) []rune { return []rune(t) })
+	crossings := findAllCrossings(area)
+
+	start := findStart(area)
+	// Start always has the lowest score
+	crossings = append(crossings, Crossing{At: start, LowestScore: math.MinInt, LowestFrom: -1})
+	end := findEnd(area)
+	// While end is just another "crossing"
+	crossings = append(crossings, Crossing{At: end, LowestScore: math.MaxInt, LowestFrom: -1})
+}

day16/sample

@@ -0,0 +1,15 @@
+###############
+#.......#....E#
+#.#.###.#.###.#
+#.....#.#...#.#
+#.###.#####.#.#
+#.#.#.......#.#
+#.#.#####.###.#
+#...........#.#
+###.#.#####.#.#
+#...#.....#.#.#
+#.#.#.###.#.#.#
+#.....#...#.#.#
+#.###.#.#.#.#.#
+#S..#.....#...#
+###############

day16/sample2

@@ -0,0 +1,17 @@
+#################
+#...#...#...#..E#
+#.#.#.#.#.#.#.#.#
+#.#.#.#...#...#.#
+#.#.#.#.###.#.#.#
+#...#.#.#.....#.#
+#.#.#.#.#.#####.#
+#.#...#.#.#.....#
+#.#.#####.#.###.#
+#.#.#.......#...#
+#.#.###.#####.###
+#.#.#...#.....#.#
+#.#.#.#####.###.#
+#.#.#.........#.#
+#.#.#.#########.#
+#S#.............#
+#################

util/slices.go

@@ -10,3 +10,12 @@ func SliceSwap[T any](s []T, x, y int) {
 	s[x] = s[y]
 	s[y] = tmp
 }
+
+func SafeGet[T any](s [][]T, at Vec2) T {
+	var none T
+	if at.X < 0 || at.Y < 0 || at.Y >= int64(len(s)) || at.X >= int64(len(s[0])) {
+		return none
+	}
+
+	return s[at.Y][at.X]
+}

util/vec.go

@@ -15,3 +15,19 @@ func (v Vec2) Add(a Vec2) Vec2 {
 func (v Vec2) Eq(a Vec2) bool {
 	return v.X == a.X && v.Y == a.Y
 }
+
+func (v Vec2) Up() Vec2 {
+	return v.Add(Vec2{0, -1})
+}
+
+func (v Vec2) Down() Vec2 {
+	return v.Add(Vec2{0, 1})
+}
+
+func (v Vec2) Left() Vec2 {
+	return v.Add(Vec2{-1, 0})
+}
+
+func (v Vec2) Right() Vec2 {
+	return v.Add(Vec2{1, 0})
+}