diff options
| author | Oscar Najera <hi@oscarnajera.com> | 2023-12-16 08:12:14 +0100 |
|---|---|---|
| committer | Oscar Najera <hi@oscarnajera.com> | 2023-12-16 08:17:33 +0100 |
| commit | 10c9cf1cb8f65970fe9022f83b81979781fbc61c (patch) | |
| tree | 23fbb78362425c1d75879ed86e365a3474eb713e /AoC2023 | |
| parent | 435987a86bfe924f0e9e504074aa8637a8b02b1c (diff) | |
| download | scratch-10c9cf1cb8f65970fe9022f83b81979781fbc61c.tar.gz scratch-10c9cf1cb8f65970fe9022f83b81979781fbc61c.tar.bz2 scratch-10c9cf1cb8f65970fe9022f83b81979781fbc61c.zip | |
day13
Diffstat (limited to 'AoC2023')
| -rw-r--r-- | AoC2023/day13/eg-in | 15 | ||||
| -rw-r--r-- | AoC2023/day13/input | 1407 | ||||
| -rw-r--r-- | AoC2023/day13/solver.lisp | 85 |
3 files changed, 1507 insertions, 0 deletions
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+..##..#..## +.#..###..## + +..##.#...##.. +#.####..#..#. +...#..#####.. +..##.##..#... +..##.##...... +##....#.#.##. +.##.#..#.#.## +##..######.#. +#...#..#.#.## +#...#.#...#.# +#...#.#...#.# +#...#..#.#.## +##..######.#. +.##.#..#.#.## +##....#.#.##. +..##.##...... +..##.##..#... + +#.##.#.##.#.# +.#..#......#. +.####.####.## +.#..#..##..#. +##..########. +.#..#.####.#. +.####.#..#.## +######.##.### +##..##....##. +.........#... +.#..#..##..#. diff --git a/AoC2023/day13/solver.lisp b/AoC2023/day13/solver.lisp new file mode 100644 index 0000000..f149f2e --- /dev/null +++ b/AoC2023/day13/solver.lisp @@ -0,0 +1,85 @@ +(ql:quickload '(fiveam)) + +(defparameter eg-vert "#...##..# +#....#..# +..##..### +#####.##. +#####.##. +..##..### +#....#..#") + +(defparameter eg-horizontal "#.##..##. +..#.##.#. +##......# +##......# +..#.##.#. +..##..##. +#.#.##.#.") + +(defun find-repeat (rows) + (loop for (one two-or-nil) on rows by #'cdr + for idx from 0 + when (and (not (null two-or-nil)) + (equal one two-or-nil)) + collect (1+ idx))) + +(defun find-v-mirror (rows) + (remove-if-not (lambda (n) (v-mirror-p rows n)) + (find-repeat rows))) + +(defun v-mirror-p (rows idx) + (every #'equal + (reverse (subseq rows 0 idx)) + (subseq rows idx))) + + +(defun find-h-mirror (rows) + (find-v-mirror + (transpose-rows rows))) + +(defun transpose-rows (rows) + (arrows:-<> + rows + (mapcar #'string-to-octets <>) + (apply #'map 'list (lambda (&rest vals) + (coerce (mapcar #'code-char vals) 'string)) <>))) + +(fiveam:test partials + (fiveam:is + (equal '(4) + (find-repeat + (cl-ppcre:split "\\n" eg-vert))))(fiveam:is + (equal '(4) + (find-v-mirror + (cl-ppcre:split "\\n" eg-vert)))) + + (fiveam:is + (equal '(3) + (find-repeat + (cl-ppcre:split "\\n" eg-horizontal)))) + (fiveam:is + (null (find-v-mirror + (cl-ppcre:split "\\n" eg-horizontal)))) + (fiveam:is + (equal '(5) + (find-h-mirror + (cl-ppcre:split "\\n" eg-horizontal))))) + +(defun solver (maps) + (let ((verical-mirrors (delete nil (mapcan #'find-v-mirror maps))) + (horizontal-mirrors (delete nil (mapcan #'find-h-mirror maps)))) + (+ + (* 100 (apply #'+ verical-mirrors)) + (apply #'+ horizontal-mirrors)))) + +(defun parse-input (file) + (arrows:->> + (uiop:read-file-string file) + (cl-ppcre:split "\\n\\n") + (mapcar (lambda (map) (cl-ppcre:split "\\n" map))))) + +(fiveam:test solutions + (fiveam:is (= 405 (solver (parse-input "eg-in")))) + (fiveam:is (= 35360 (solver (parse-input "input"))))) + +(fiveam:run!) |