diff options
| -rw-r--r-- | day23 | 71 | ||||
| -rw-r--r-- | day23.rkt | 70 |
2 files changed, 141 insertions, 0 deletions
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+..##.#.###.####.#####...#......#.#.###...###..##.##.###.####.###.#..#.# +#.##..####.#.#..#.##..#.##.#.##.#..###.####.#.#.#.##..#.....##.#.#...#. +.##...#.#.#####.###.#...###.#......#####.....#.#######.##.#..##...###.. +##.#.#####......####.####...#####....#..####.#.#.####...####.###.###.## +#.#.#.####..##.##.##.#.##.#.#####.##...#....##..##...#.######.....#..## +.#.....#...###.#.#.###.#..#...###...##.......####...####.###..#....#... +..##.##..#......###...##.....##.#..#...###.##.#.##.##...#.#...#.#..#... diff --git a/day23.rkt b/day23.rkt new file mode 100644 index 0000000..02e6550 --- /dev/null +++ b/day23.rkt @@ -0,0 +1,70 @@ +#lang racket + +(define occupied + (list->mutable-set + (for*/list ([(line row) (in-indexed (file->lines "day23"))] + [(char col) (in-indexed line)] + #:when (equal? char #\#)) + (vector col row)))) + +; (set-count occupied) +; occupied + +(define adjs (list (list #(0 -1) #(1 -1) #(-1 -1)) + (list #(0 1) #(1 1) #(-1 1)) + (list #(-1 0) #(-1 1) #(-1 -1)) + (list #( 1 0) #( 1 1) #( 1 -1)))) +(define dirs (list #(0 -1) + #(0 1) + #(-1 0) + #( 1 0))) + +(let loop ((rounds 1)) + (define next (make-hash)) + (for ([elf occupied]) + (unless (for*/and ([dx '(-1 0 1)] + [dy '(-1 0 1)] + #:unless (= dx dy 0)) + (not (set-member? occupied (vector-map + elf (vector dx dy))))) + (for/or ([adj adjs] + [dir dirs]) + (if (for/and ([p adj]) + (not (set-member? occupied (vector-map + elf p)))) + (begin + (hash-update! next + (vector-map + elf dir) + (lambda (l) (cons elf l)) + '()) + #t) ;; break + #f)))) + + (set! adjs (append (cdr adjs) (list (car adjs)))) + (set! dirs (append (cdr dirs) (list (car dirs)))) + + (define moved #f) + (for ([(cand elf) next]) + (when (= (length elf) 1) + (set-remove! occupied (first elf)) + (set-add! occupied cand) + (set! moved #t))) + + (when (= rounds 10) + (displayln (for/fold ([min-x 9999] + [max-x -9999] + [min-y 9999] + [max-y -9999] + #:result (- (* (- max-x min-x -1) + (- max-y min-y -1)) + (set-count occupied)) + ) + ([elf occupied]) + (values (min min-x (vector-ref elf 0)) + (max max-x (vector-ref elf 0)) + (min min-y (vector-ref elf 1)) + (max max-y (vector-ref elf 1)))))) + ;; 3940 + + (if moved + (loop (+ rounds 1)) + (displayln rounds))) +;; 990 |