Day 20, Part 2.
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178
src/20.rkt
178
src/20.rkt
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@ -4,37 +4,171 @@
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(define input (map string-lines (problem-input-grouped 20)))
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;; name: number?
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;; image: image? = (listof (listof char?))
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(struct tile (name image) #:transparent)
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(define (parse-tile tile-strings)
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(match-let ([`(,name ,rows ...) tile-strings])
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(list (string->number (second (regexp-match #px"Tile (\\d+):" name)))
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(tile (string->number (second (regexp-match #px"Tile (\\d+):" name)))
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(map string->list rows))))
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(define tiles
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(map parse-tile input))
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(define tiles (map parse-tile input))
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(define dim (sqrt (length tiles)))
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(define size (length (tile-image (first tiles))))
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(define (tile-edges tile)
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(match-let ([(list name rows) tile])
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(list name (list (first rows)
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(map last rows)
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(reverse (last rows))
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(reverse (map first rows))))))
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;; Orientations (rotated and flipped)
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(define (o1 image) image)
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(define (o2 image) (reverse image))
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(define (o3 image) (map reverse image))
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(define (o4 image) (reverse (map reverse image)))
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(define (o5 image) (map #{map (λ~> (list-ref %)) image} (range (length image))))
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(define (o6 image) (map #{map (λ~> (list-ref %)) (reverse image)} (range (length image))))
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(define (o7 image) (map #{map (λ~> (list-ref %)) image} (reverse (range (length image)))))
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(define (o8 image) (map #{map (λ~> (list-ref %)) (reverse image)} (reverse (range (length image)))))
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(define tiles-edges
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(map tile-edges tiles))
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;; Image fits top and left when not false, respectively
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;; fit-image: image? (or/c (listof char?) #f) (or/c (listof char?) #f) -> (or/c image? #f)
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(define (fit-image image t l)
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(define (left image) (map first image))
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(or (let ([i (o1 image)]) (and (or (not t) (equal? (first i) t)) (or (not l) (equal? (left i) l)) i))
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(let ([i (o2 image)]) (and (or (not t) (equal? (first i) t)) (or (not l) (equal? (left i) l)) i))
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(let ([i (o3 image)]) (and (or (not t) (equal? (first i) t)) (or (not l) (equal? (left i) l)) i))
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(let ([i (o4 image)]) (and (or (not t) (equal? (first i) t)) (or (not l) (equal? (left i) l)) i))
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(let ([i (o5 image)]) (and (or (not t) (equal? (first i) t)) (or (not l) (equal? (left i) l)) i))
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(let ([i (o6 image)]) (and (or (not t) (equal? (first i) t)) (or (not l) (equal? (left i) l)) i))
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(let ([i (o7 image)]) (and (or (not t) (equal? (first i) t)) (or (not l) (equal? (left i) l)) i))
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(let ([i (o8 image)]) (and (or (not t) (equal? (first i) t)) (or (not l) (equal? (left i) l)) i))))
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(define (corner? edges tiles)
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(let ([tiles (map second tiles)])
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(= 2 (count #{for/or ([target tiles])
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(or (member % target)
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(member (reverse %) target))}
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edges))))
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;; Tile's image fits top and left when not false, respectively
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;; fit-tile: tile? (or/c (listof char?) #f) (or/c (listof char?) #f) -> (or/c tile? #f)
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(define (fit-tile t top left)
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(let ([image (fit-image (tile-image t) top left)])
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(and image (struct-copy tile t [image image]))))
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;; Given the 0th to (i-1)th tiles, counting left-to-right then top-to-bottom,
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;; find the remaining ith to last tiles that fit in the dim x dim grid
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;; build-image: (hashof (list number? number?) tile?) number? -> (hashof (list number? number?) tile?)
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(define (build-image image tiles i)
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(let* ([r (quotient i dim)]
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[c (remainder i dim)]
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[top-tile (and (> r 0) (hash-ref image (list (sub1 r) c)))]
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[left-tile (and (> c 0) (hash-ref image (list r (sub1 c))))]
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[top (and top-tile (last (tile-image top-tile)))]
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[left (and left-tile (map last (tile-image left-tile)))])
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(for/or ([tile tiles])
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(let* ([tile* (fit-tile tile top left)]
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[image (hash-set image (list r c) tile*)])
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(and tile* (or (and (= (add1 i) (* dim dim)) image)
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(build-image image (remove tile tiles) (add1 i))))))))
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;; corner?: tile? -> boolean?
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(define (corner? tile)
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(define (edges tile)
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(let ([image (tile-image tile)])
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(list (first image) (last image)
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(map first image) (map last image))))
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(let ([tile-edges (edges tile)])
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(= 2 (count #{for/or ([other (remove tile tiles)])
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(let ([other-edges (edges other)])
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(or (member % other-edges)
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(member (reverse %) other-edges)))}
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tile-edges))))
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;; Find a corner piece
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;; corner: tile?
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(define corner
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(for/first ([tile tiles]
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#:when (corner? tile))
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tile))
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;; A mapping from positions in the layout to the correctly-oriented tile
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;; (hashof (list number? number?) tile?)
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(define image-hash
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(let ([corner (λ (o) (struct-copy tile corner [image (o (tile-image corner))]))]
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[tiles (remove corner tiles)])
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(or (build-image (hash (list 0 0) (corner o1)) tiles 1)
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(build-image (hash (list 0 0) (corner o2)) tiles 1)
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(build-image (hash (list 0 0) (corner o3)) tiles 1)
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(build-image (hash (list 0 0) (corner o4)) tiles 1))))
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;; The full image with borders removed
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;; image: (listof (listof char?))
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(define image
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(for/fold ([image '()]
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#:result (o4 image))
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([r dim])
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(append image
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(for/fold ([rows (make-list (- size 2) '())])
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([c dim])
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(let* ([image (tile-image (hash-ref image-hash (list r c)))]
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[image (map #{drop-right (drop % 1) 1} (drop-right (drop image 1) 1))])
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(map append rows image))))))
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(define dimsize (length image))
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(define image-vectors (lists->vectors image))
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(define (vector-pos r c) (vector-ref (vector-ref image-vectors r) c))
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#| (r, c) = O
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#
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# ## ## O## <--- friend
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# # # # # #
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|#
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(define (sea-monster-coords r c)
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(list `(,(- r 1) ,(+ c 1))
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`(,r ,c)
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`(,r ,(+ c 1))
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`(,r ,(+ c 2))
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`(,r ,(- c 5))
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`(,r ,(- c 6))
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`(,r ,(- c 11))
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`(,r ,(- c 12))
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`(,r ,(- c 17))
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`(,(+ r 1) ,(- c 1))
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`(,(+ r 1) ,(- c 4))
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`(,(+ r 1) ,(- c 7))
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`(,(+ r 1) ,(- c 10))
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`(,(+ r 1) ,(- c 13))
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`(,(+ r 1) ,(- c 16))))
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;; sea-monster?: number? number? -> boolean?
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(define (sea-monster? r c)
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(define (pound? c) (char=? c #\#))
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(andmap #{pound? (vector-pos (first %) (second %))}
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(sea-monster-coords r c)))
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;; A list of the neck coordinates of sea monsters
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;; sea-monsters: (listof (list number? number?))
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(define sea-monsters
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(for*/list ([r (range 1 (sub1 dimsize))]
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[c (range 17 (- dimsize 2))]
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#:when (and (andmap #{char=? (vector-pos r %)}
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(range c (+ c 3)))
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(sea-monster? r c)))
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(list r c)))
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;; Replace the # of a sea monster with O in image-vectors
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(define (reveal-sea-monster! r c)
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(for-each #{vector-set! (vector-ref image-vectors (first %)) (second %) #\O}
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(sea-monster-coords r c)))
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;; Reveal the sea monsters in image-vectors, then write to file
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(define (draw-sea-monsters!)
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(for-each #{reveal-sea-monster! (first %) (second %)} sea-monsters)
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(display-lines-to-file
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(map (λ~> vector->list list->string)
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(vector->list image-vectors))
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"../input/20-image.txt"
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#:exists 'replace))
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(define part1
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(for/product ([tile tiles-edges]
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#:when (corner? (second tile)
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(remove tile tiles-edges)))
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(first tile)))
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(* (tile-name (hash-ref image-hash (list 0 0)))
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(tile-name (hash-ref image-hash (list 0 (sub1 dim))))
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(tile-name (hash-ref image-hash (list (sub1 dim) 0)))
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(tile-name (hash-ref image-hash (list (sub1 dim) (sub1 dim))))))
|
||||
|
||||
(define part2 #f)
|
||||
(define part2
|
||||
(- (count #{char=? % #\#} (apply append image))
|
||||
(* (length sea-monsters) 15)))
|
||||
|
||||
(show-solution part1 part2)
|
||||
|
|
|
|||
Loading…
Reference in New Issue