diff options
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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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!) |