diff options
| author | Alexandre Jesus <adbjesus@gmail.com> | 2024-01-03 19:23:30 +0000 |
|---|---|---|
| committer | Alexandre Jesus <adbjesus@gmail.com> | 2024-01-03 19:23:30 +0000 |
| commit | 22a3cb76fefbfa8c444f1ae39a8a4304ad3950ba (patch) | |
| tree | 4027330e67eb34b6d500857b1856e65005088437 | |
| parent | caf416319e8807e0648b3e8ad12fdbfa813f669a (diff) | |
| download | aoc2023-22a3cb76fefbfa8c444f1ae39a8a4304ad3950ba.tar.gz aoc2023-22a3cb76fefbfa8c444f1ae39a8a4304ad3950ba.zip | |
day13
| -rw-r--r-- | data/13/example.txt | 15 | ||||
| -rw-r--r-- | data/13/input.txt | 1387 | ||||
| -rw-r--r-- | day13.lisp | 46 |
3 files changed, 1448 insertions, 0 deletions
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+...###.#.....##.. +.#..##..#.###..## +#..###.####...### +#####.#...#.##... +#####.#..###.#### +#########.#.##### +.#####....##..### +##.#..#..####..## diff --git a/day13.lisp b/day13.lisp new file mode 100644 index 0000000..861950c --- /dev/null +++ b/day13.lisp @@ -0,0 +1,46 @@ +(defun read-maps (filespec) + (with-open-file (stream filespec) + (loop for line = (read-line stream nil) + while line + collect (loop collect line + while (setf line (read-line stream nil)) + while (> (length line) 0))))) + +(defun count-diff (list1 list2) + (loop for string1 in list1 + for string2 in list2 + sum (loop for c1 across string1 + for c2 across string2 + sum (if (equal c1 c2) 0 1)))) + +(defun find-horizontal-mirror (map &optional (ndiff 0)) + (loop for prev = () then (cons (car rem) prev) + for rem on map + for i upto (length map) + if (and prev rem (= ndiff (count-diff prev rem))) + return i)) + +(defun rotate-map (map) + (loop for i below (length (first map)) + collect (coerce (loop for line in map collect (aref line i)) '(string)))) + +(defun find-vertical-mirror (map &optional (ndiff 0)) + (find-horizontal-mirror (rotate-map map) ndiff)) + +(defun solve (filespec &optional (ndiff 0)) + (let ((maps (read-maps filespec))) + (loop for map in maps + as aux = (find-horizontal-mirror map ndiff) + if aux + sum (* 100 aux) + else + sum (find-vertical-mirror map ndiff)))) + +(defun solve1 (filespec) (solve filespec)) + +(defun solve2 (filespec) (solve filespec 1)) + +(print (solve1 "data/13/example.txt")) ;; 405 +(print (solve1 "data/13/input.txt")) ;; 30535 +(print (solve2 "data/13/example.txt")) ;; 400 +(print (solve2 "data/13/input.txt")) ;; 30844 |