Mercurial > repos > other > adventofcode2023
view 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 |
line wrap: on
line source
--- 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.