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AOC 2022 day 10 in Common Lisp, code golf style
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;;;; AOC 2022 day 10 in Common Lisp, | |
;;;; based on https://www.reddit.com/r/adventofcode/comments/zhjfo4/2022_day_10_solutions/izmspl7/ | |
#| (mostly) original Python: | |
from itertools import accumulate | |
f = lambda x: int(x) if x[-1].isdigit() else 0 | |
xs = [*map(f, open('day10.txt').read().split())] | |
part1, part2 = 0, '\n' | |
for i, x in enumerate(accumulate([1]+xs), 1): | |
part1 += i*x if i%40==20 else 0 | |
part2 += '#' if ((i-1)%40)-x in [-1,0,1] else ' ' | |
if i%40 == 0: | |
part2 += '\n' | |
print(part1, part2) | |
|# | |
(require "uiop") | |
(let* ((tokens (uiop:split-string (uiop:read-file-string "day10.txt") :separator '(#\Newline #\ ))) | |
(tokens (remove "" tokens :test 'equal)) | |
(xs (map 'list (lambda (x) (setq x (read-from-string x)) (if (numberp x) x 0)) tokens)) | |
(part1 0) | |
(part2 (make-array 0 :element-type 'character :adjustable t :fill-pointer t)) | |
(i 1) | |
(x 0)) | |
(vector-push-extend #\Newline part2) | |
(push 1 xs) | |
(dolist (n xs) | |
(incf x n) | |
(when (= (rem i 40) 20) (incf part1 (* i x))) | |
(vector-push-extend (case (- (rem (- i 1) 40) x) | |
((-1 0 1) #\#) | |
(t #\ )) | |
part2) | |
(when (zerop (rem i 40)) | |
(vector-push-extend #\Newline part2)) | |
(incf i)) | |
(princ "AOC 2022 day10 part1: ") (princ part1) (terpri) | |
(princ "AOC 2022 day10 part2: ") (princ part2)) |
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