Mercurial > repos > other > adventofcode2023
diff day16.txt @ 22:ad73a2ff3d06
Implement Day 15 part 1 and all of Day 16
Hash implementation was trivial, but I skipped the rest for now.
Day 16 part 1 approach works unchanged for part 2! Just needed
to run repeatedly with different inputs.
| author | IBBoard <dev@ibboard.co.uk> |
|---|---|
| date | Sat, 16 Dec 2023 14:42:06 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/day16.txt Sat Dec 16 14:42:06 2023 +0000 @@ -0,0 +1,49 @@ +--- Day 16: The Floor Will Be Lava --- + +A laser/mirror problem - "/" and "\" are mirrors that reflect 90°. +"-" and "|" are splitters - transparent in the same orientation, +but TWO beams go at 90° if hit against the flat edge. +"." is empty space. + +The laser starts in the top-right. + +For an example map: + +.|...\.... +|.-.\..... +.....|-... +........|. +.......... +.........\ +..../.\\.. +.-.-/..|.. +.|....-|.\ +..//.|.... + +The laser goes: + +>|<<<\.... +|v-.\^.... +.v...|->>> +.v...v^.|. +.v...v^... +.v...v^..\ +.v../2\\.. +<->-/vv|.. +.|<<<2-|.\ +.v//.|.v.. + +Every space that the laser goes through is "energised", which gives: + +######.... +.#...#.... +.#...##### +.#...##... +.#...##... +.#...##... +.#..####.. +########.. +.#######.. +.#...#.#.. + +The count of energised spaces is 46. \ No newline at end of file