diff --git a/2020/20.rkt b/2020/20.rkt new file mode 100644 index 0000000..f313674 --- /dev/null +++ b/2020/20.rkt @@ -0,0 +1,49 @@ +#lang br +(require racket/file rackunit) + +(define edge-flipped + (let () + (define cache (make-hasheq)) + (define bit-count 10) + (define (edge-flipper x) + (for/sum ([(b i) + (in-indexed (for/list ([b (in-range (sub1 bit-count) -1 -1)]) + (bitwise-bit-set? x b)))] + #:when b) + (arithmetic-shift 1 i))) + (λ (x) (hash-ref cache x (λ () (edge-flipper x)))))) + +(struct tile (num edges) #:transparent) + +(define (tilestr->edgevals tilestr) + (define vec (list->vector (string->list (string-replace tilestr "\n" "")))) + (for/list ([validxs (list (range 10) ; top + (range 9 100 10) ; right + (range 99 89 -1) ; bottom + (range 90 -1 -10) ; left + )]) + (for/sum ([idx (in-list validxs)] + [i (in-naturals)] + #:when (char=? (vector-ref vec idx) #\#)) + (arithmetic-shift 1 i)))) + +(define tiles + (let* ([recs (string-split (file->string "20.rktd") "Tile")] + [recs (map string-trim recs)]) + (for/list ([rec recs]) + (match-define (list numstr tilestr) (string-split rec ":")) + (tile (string->number numstr) + (tilestr->edgevals tilestr))))) + +(define (matching-edges tile) + (for/list ([edge (in-list (tile-edges tile))]) + (for/first ([other-tile (in-list (remove tile tiles))] + #:when + (for*/or ([other-edge (in-list (tile-edges other-tile))]) + (or (eq? edge other-edge) (eq? edge (edge-flipped other-edge))))) + other-tile))) + +(define (corner-tile? tile) + (= 2 (length (filter values (matching-edges tile))))) + +(check-equal? (apply * (map tile-num (filter corner-tile? tiles))) 15405893262491) diff --git a/2020/20.rktd b/2020/20.rktd new file mode 100644 index 0000000..eac9f1a --- /dev/null +++ b/2020/20.rktd @@ -0,0 +1,1728 @@ +Tile 1567: +.####.##.# +.......#.. +.###..###. +.....#..#. +..#....#.. +#......### +#..#.....# +#....##... +...###...# +#.#.#..##. + +Tile 3313: +.#.#...... +#...#..... +#...##.... +#....#.#.. +.....###.. +#.##.##... +..#.#####. +....#..#.# +#########. +..#.#.##.. + +Tile 1181: +#......... +.##.....## +...#..##.# +#......#.. +#...#...#. +.#.#.....# +.#...##... +..###...## +...#...#.. +.##..#..## + +Tile 3967: +.#.#.#.... +#......... +#..#..#... +.##......# +###.....#. +.##..#.... +#...#...#. +...#...... +#....#.#.. +#.##...... + +Tile 1913: +.######..# +#......##. +........## +..#....... +###......# +.#..#.#### +.....#..## +#...#..... +##........ +#.#.##.### + +Tile 2593: +..#..#.##. +#.#....#.# +#..#..#..# +##....##.# +#.....#..# +#..##..... +....#....# +#...#.#.#. +.......#.# +##..###... + +Tile 3709: +#...###### +###.#.#..# +.##..##... +...#...... +#.##....## +#.#......# +.#.###..#. +.........# +.....##..# +.#.##.##.. + +Tile 1823: +##.##..#.# +#...#..... +#...#....# +.#...#.#.. +###..#..## +.#.##...#. +#..#..#..# +##...#.#.. +#.#.#.#... +.#.#...##. + +Tile 3371: +.##.##.### +.#.......# +....#..#.# +#..#.#..#. +#..#.#.#.. +.#....##.. +##.###.... +..#.##.#.. +###.#.###. +....#.###. + +Tile 2309: +##.....### +##........ +##....#..# +.#.#.#...# +.......... +...##..#.. +#....#...# +#....#...# +#.##.##..# +.#.#.####. + +Tile 1451: +.###.#.#.# +##...#.#.. +#...#.#... +.##......# +.........# +......#... +##......#. +.......#.. +...##.#.## +#.##....## + +Tile 2549: +##..#...## +..#..#...# +#.##...#.. +....#..##. +...##..... +#..#...... +#..###.... +.#.......# +...###.#.. +#.#####... + +Tile 1861: +#...#..#.. +#.#....#.. +#..#...### +#....##... +#.....##.. +#........# +##.......# +....###... +#....#...# +.##.#.#.#. + +Tile 2897: +..###..... +##.#.#.#.# +.#.......# +..#.#....# +##.##.#... +..#.###... +.##......# +...#...#.. +#.#......# +#..###..## + +Tile 3833: +##...#.#.. +#..#.#..## +.#...#.### +#........# +##.##....# +##...#.#.# +#......... +....#..#.. +#......#.. +....##..## + +Tile 2389: +..##.##### +#...##.#.# +..#...#.## +##.#..#..# +#..#.#.... +#.#..##... +#......#.. +......#... +..#.###... +.#######.. + +Tile 1549: +...##.##.. +.......... +..#...##.. +.###.#..#. +.#..####.. +##..#..### +..#.###... +.#.......# +...####... +#....#...# + +Tile 2671: +#..#.....# +###.#..... +#...#...#. +..#.##.#.. +..###.##.. +###.#...#. +#..##..#.. +#..###...# +...#...... +.#....##.# + +Tile 2339: +.##..###.# +.#.#...##. +.#.#...... +..##...... +.#.#.#...# +.##....##. +#....##... +#.#...#..# +..#.....## +..####.### + +Tile 3163: +.##.#...#. +...##....# +.#.#.#...# +#...#..##. +....#..#.# +#..#.#.... +..#......# +..#..#...# +#....#.#.# +###..####. + +Tile 1699: +.....####. +#..#...#.. +##....#### +...##..#.. +...#...### +##....#.## +###......# +..#.###.#. +.#.....#.# +.#.#..##.# + +Tile 3701: +.#..#.##.# +.##....... +.#.#.#..## +...#.#...# +.........# +#.##..#... +.##.##.##. +....#.#.## +.###.....# +##.######. + +Tile 3547: +.##..###.. +#...#..#.# +#....#.... +....###..# +#.##..##.. +....#...#. +......#..# +...#...... +..#....#.# +##.#.#.#.# + +Tile 2543: +...#.#.... +.....#...# +#........# +....#.#... +...#..#.## +###..#...# +#..###..#. +#..##....# +.#..#....# +###.#..#.# + +Tile 3299: +##.#..###. +##........ +.......#.. +#......... +##.......# +..##...##. +.#..##.#.# +.##.#...## +..#..#.#.# +.##.#.#..# + +Tile 2371: +..#...###. +#.#......# +.##.....#. +..#...#.#. +#.#.#..... +.#......## +.......... +.......#.# +#.....#.#. +..#####.## + +Tile 2441: +...##.#... +#.....##.. +#.#.#..#.. +#...###.#. +##.......# +#......#.# +##...#..## +#....#.##. +#...#.##.# +##.##.#### + +Tile 3209: +#.#.##..## +#.....##.. +.........# +........## +#..#....## +...###...# +..#......# +#....#..#. +###.#.##.# +##.#.##### + +Tile 2521: +##..#....# +#......... +...#...##. +##.#.#...# +......#..# +....#.#..# +....##...# +.........# +...#...... +..##.....# + +Tile 2819: +...##..#.. +.#........ +..#....#.# +##...#...# +##.#.....# +....#....# +..#.....## +#..#...### +...##...## +#.##.##..# + +Tile 1811: +.#..#..... +###.##...# +#.#....... +#........# +...#.##... +.##......# +.####..#.# +#....##..# +.#....##.. +.#..#.##.. + +Tile 3169: +##.##.#### +.....#..#. +.......... +##.##..... +.#...#..#. +#..#...#.. +#....#.##. +##.......# +#.....###. +########.# + +Tile 3079: +.#..###.## +##..##...# +#.#..##.## +##..#..... +......#... +..#...#.#. +#..#.#...# +##.....##. +.....#.#.. +......#... + +Tile 1187: +###...##.# +#......... +.##...##.. +#..#...... +.#.#.....# +####....#. +...#...... +.....#..## +.##......# +#.#####.## + +Tile 2243: +###.##.#.. +....#.#.#. +#.###....# +.#....###. +#....##..# +#...##...# +#...##...# +###.##..## +........#. +#.#.###### + +Tile 2887: +#.##.###.# +#...#....# +..#....... +#..##.#.## +##..#.##.. +#......... +....#...#. +#....#.... +#####.#..# +..#######. + +Tile 2063: +###.###..# +##...#...# +..###..... +#...#.##.. +.#.......# +##...#.... +.##.#.##.# +.##....... +#......... +######.#.# + +Tile 1609: +##..##.##. +.#.#...##. +#........# +#....#...# +.#......## +..#......# +#...#..... +.#........ +...#.....# +..#.###... + +Tile 1039: +.####.#.## +#......##. +...#.#.#.. +##..##.... +##.#...#.. +###....### +....##.... +..##...... +#...#..... +..#..#.##. + +Tile 3697: +#..#.##### +#......#.. +#......... +.....#...# +#...###... +#.......#. +..##....#. +..#.##..#. +#...##...# +.##.#.##.# + +Tile 1601: +##.###..#. +.#..#..... +...#...... +#...###... +#...#..#.. +...#.#..#. +..##...#.# +.#........ +..##.#...# +#..#...##. + +Tile 1019: +.#.##.#..# +#....#.### +#...##.#.. +.#..###.#. +.#......## +...#..###. +##....#..# +#.......#. +....###..# +.###.###.# + +Tile 3449: +.##....#.. +.........# +..#...#.## +##......#. +.......##. +#....#.... +#....#..## +##......#. +##..#.#..# +#.#.#.##.# + +Tile 2383: +#####.##.. +..#...#.#. +..##...#.# +.#...##.#. +##....#..# +##..#.###. +.#.....#.. +#...#....# +#.#....#.# +#.##....#. + +Tile 3083: +##.#...#.# +.#...#.... +....##..## +.##.#.#..# +#....#.#.# +##.###...# +#..##....# +#..#.#...# +#.#.#.#... +.##.#...#. + +Tile 1237: +..#.###### +..#..#.### +......#.#. +#...#..#.# +##.....##. +#####..#.# +.#.#.##..# +.#..#....# +......#... +.#.##...## + +Tile 2837: +.#.#..#..# +..#....#.# +###..#.... +#.#..#.... +#.###....# +..##..#... +##.##..#.# +#...##.... +......#.#. +##.#.....# + +Tile 1709: +###.##...# +.#...##..# +##.####.## +#..##...## +#..#....## +#.#...#... +###....... +#...#....# +#......... +##....###. + +Tile 2657: +#.##..##.. +....#.#... +#...#..... +..##..#### +.#.......# +##......## +..#.#.#..# +...#.....# +#..#...... +#.##..#... + +Tile 1091: +##.###...# +..###...#. +#.#....#.# +##...#..## +#...#..... +.....#...# +..#......# +...###.#.. +.##.#....# +#....##### + +Tile 1259: +.#.#.....# +#.#.##.### +.#.#.#..#. +#..##..... +#...#...#. +#....#.#.# +#....##... +.#........ +...###..## +..#.#####. + +Tile 1409: +#.###.#..# +.#....#..# +#......... +.......... +##...#...# +##.#....## +.....#.... +#........# +###..#.#.. +..#..#.### + +Tile 2539: +####...#.# +#...###..# +.##.##...# +#..##..#.. +.##.#..#.# +#..#####.. +#....#...# +.....#..## +#..#..#..# +..#...#... + +Tile 3343: +#..#....## +#..#....#. +.#.#...##. +.#...###.. +.#.#....#. +.......... +#........# +#..#....## +###.##.... +.##..#..## + +Tile 1471: +.#.##.#.## +#...#....# +#.#....### +#.#..#..#. +...##..##. +##.##...#. +#..#.#.#.. +#.##...#.. +........## +..####.#.. + +Tile 3571: +..##.####. +...#....#. +....##..#. +....#.##.. +####.....# +..#..#.... +...#...... +##.#....#. +....#....# +#....##... + +Tile 1637: +#..##.#... +.#....#... +.......#.. +#...##.... +#...##...# +#..#.....# +.#.##..... +.##.....## +###.###..# +.#.##..### + +Tile 2293: +..#..##.#. +#.##...... +....#...#. +#.##...#.# +##..#..... +.........# +........## +#....#...# +#..##..#.# +#.#.###..# + +Tile 2099: +...#.#..## +....#..... +#.#....##. +.....##... +#.##...... +.......### +..#######. +......#..# +#...#....# +###.#..##. + +Tile 1499: +...#..#### +#.#..#.#.. +###......# +##.....#.# +..#..#...# +.#..#.#... +..#......# +#.###...#. +####.....# +#.#....... + +Tile 3853: +.#.###.### +......#..# +#.#....#.. +#....#.#.# +#..##..... +.#.....#.. +......##.# +#.#.#..... +#......... +##.####... + +Tile 1423: +.######### +##...#.#.# +##......## +#......... +##...#..## +..#.#.#.## +......#... +.#.##..... +....##...# +###...##.. + +Tile 2351: +##.....### +...#.##.#. +.###..##.. +.#..#....# +#...##..## +#...#.##.. +#..#.....# +.#...#.... +......##.. +..#.#.#### + +Tile 3739: +.##.#..... +.#..#...## +#......... +#.#..##.#. +.#...###.. +#.....#.## +#.......#. +##...#...# +...###.#.# +.#...#.#.# + +Tile 2699: +..#.#..### +##.......# +#####.#... +##..#.#.## +##..#..... +..#....... +.##..##... +...#...... +##.#...... +#..##.#... + +Tile 1301: +##..#.#### +...#.....# +#.#..#...# +#.......#. +..#..#.... +....#..... +....##.##. +#...##.... +#..#.....# +.#.######. + +Tile 2579: +#.#.###.## +.#........ +....#....# +#...#..... +#..#....## +###.#####. +#.#.#.##.. +#.....#... +...#...#.. +#.#..#...# + +Tile 2621: +#.#.#..#.. +#..#...... +...##.#... +..#..#..## +.......### +#.....#### +.....#...# +##....##.# +##......#. +..#.#..#.# + +Tile 3407: +.###.##.## +#......#.. +#.#......# +#...#...## +####..##.. +####...#.# +.#..#...#. +##.#.....# +..#....#.# +.#....#.## + +Tile 1583: +....#.#.## +..#.....## +#........# +#....#...# +#....#.... +..#.#..... +#....###.# +...#.##... +#...##.... +##..###... + +Tile 2659: +..###..#.# +.....#.#.. +##.....##. +##....#... +..##..#... +.##.....#. +##.....### +..##.....# +##.##..... +.....###.# + +Tile 1117: +#..######. +#....##.## +##.......# +....#..... +#..#...#.# +##....#... +....#.##.. +....#.#..# +.#.#####.# +..##.....# + +Tile 2029: +#.#.#.##.# +##..#..#.. +#.##.#..## +.#......## +#......#.. +#...#..... +..#.##...# +#......... +..##.##..# +#.#.##.##. + 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+.#.....#.# +#.###..... +#......... +.....#...# +##.#...... +.##.#..### + +Tile 1201: +#.#.#####. +...#...... +.#....##.# +.#.......# +.#..#..... +...##..... +.......... +.#....#..# +#.#..###.. +##...###.# + +Tile 1873: +##..#..... +##....#..# +.......... +....##.##. +##......#. +......#... +#..#.#...# +....#..#.# +##.....### +.###.#..## + +Tile 3373: +.#.#.#.##. +#.#.##.##. +#.###...#. +..##...##. +....#....# +....#.#.#. +.#.#.....# +####..#.## +..#..#..## +.##.###.#. + +Tile 2903: +....##...# +#........# +#....#..#. +.......#.. +#.#....... +....#...## +##..##...# +####...#.# +.#...#.### +#.#..###.. + +Tile 1933: +.##..#.#.. +#..##....# +.....#.... +#..#.#..## +#..####... +#..###.#.. +..##...... +#..#.#.... +#......... +##.##.#.## + +Tile 2083: +#.#...#### +##..#.##.# +.........# +.....#.### +..#....... +.##..#..## +.#..#..... +...#....#. +......#.## +.##.##...# + +Tile 1453: +#.......#. +#.#.....#. +#.#..##... +...#..#... +##..###... +.......### +##.##.#..# +...##..... +#.#..#...# 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