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diff day14.txt @ 21:46fb65f2cb94

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Add Day 14 part 1 implementation If you look at columns and see "how far can this go" then the weight is just the sum of the partial triangle numbers of highest_weight to highest_weight minus number of rocks that can roll up to there. Part 2 seems to involve actually moving the rocks, though!
author IBBoard <dev@ibboard.co.uk>
date Sat, 16 Dec 2023 10:29:36 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/day14.txt	Sat Dec 16 10:29:36 2023 +0000
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+--- Day 14: Parabolic Reflector Dish ---
+
+Given movable objects (O) and stationary objects (#) with free space (.),
+"tilt" the map to the top so that the movable objects slide to the top
+of the map and then determine the total "load" - the sum of the number
+of rows from the movable object to the bottom of the map.
+
+Given:
+
+O....#....
+O.OO#....#
+.....##...
+OO.#O....O
+.O.....O#.
+O.#..O.#.#
+..O..#O..O
+.......O..
+#....###..
+#OO..#....
+
+Sliding makes it:
+
+OOOO.#.O..
+OO..#....#
+OO..O##..O
+O..#.OO...
+........#.
+..#....#.#
+..O..#.O.O
+..O.......
+#....###..
+#....#....
+
+The load calculation is:
+
+OOOO.#.O.. 10
+OO..#....#  9
+OO..O##..O  8
+O..#.OO...  7
+........#.  6
+..#....#.#  5
+..O..#.O.O  4
+..O.......  3
+#....###..  2
+#....#....  1
+
+Which gives 136.
+
+Given a huge map, what is the load?
+
+--- Part 2 ---
+
+Now we want to cycle them by shifting them all in a cycle north, west, south and east.
+
+After 1 cycle:
+.....#....
+....#...O#
+...OO##...
+.OO#......
+.....OOO#.
+.O#...O#.#
+....O#....
+......OOOO
+#...O###..
+#..OO#....
+
+After 2 cycles:
+.....#....
+....#...O#
+.....##...
+..O#......
+.....OOO#.
+.O#...O#.#
+....O#...O
+.......OOO
+#..OO###..
+#.OOO#...O
+
+After 3 cycles:
+.....#....
+....#...O#
+.....##...
+..O#......
+.....OOO#.
+.O#...O#.#
+....O#...O
+.......OOO
+#...O###.O
+#.OOO#...O
+
+
+What is the top load after 1,000,000,000 cycles?
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