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40 lines
1.5 KiB
Racket
40 lines
1.5 KiB
Racket
#lang br
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(require racket/file rackunit racket/set)
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(struct result (who cards) #:transparent)
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(match-define (list p1s p2s)
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(let* ([str (file->string "22.rktd")]
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[strs (string-split str "\n\n")])
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(map (λ (str) (cdr (map string->number (string-split str "\n")))) strs)))
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(define (play-game p1s p2s [recursive #false])
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(define game-states (mutable-set))
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(let/ec exit
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(for/fold ([p1s p1s] [p2s p2s]
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#:result (if (empty? p1s) (result 'p2 p2s) (result 'p1 p1s)))
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([i (in-naturals)]
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#:break (or (empty? p1s) (empty? p2s)))
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(match-define (list (cons p1 p1s-rest) (cons p2 p2s-rest)) (list p1s p2s))
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(define (p1-wins) (values (append p1s-rest (list p1 p2)) p2s-rest))
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(define (p2-wins) (values p1s-rest (append p2s-rest (list p2 p1))))
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(cond
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[(and recursive
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(let ([game-state (cons p1s p2s)])
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(when (set-member? game-states game-state)
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(exit (result 'p1 p1s)))
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(set-add! game-states game-state))
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(<= p1 (length p1s-rest)) (<= p2 (length p2s-rest)))
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(match (play-game (take p1s-rest p1) (take p2s-rest p2) #true)
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[(result 'p1 _) (p1-wins)]
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[_ (p2-wins)])]
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[(> p1 p2) (p1-wins)]
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[else (p2-wins)]))))
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(define (winner->score winner)
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(for/sum ([(val i) (in-indexed (reverse (result-cards winner)))])
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(* val (add1 i))))
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(check-equal? (winner->score (play-game p1s p2s)) 30138)
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(check-equal? (winner->score (play-game p1s p2s #true)) 31587) |