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17 lines
639 B
Racket
17 lines
639 B
Racket
#lang br
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(require racket/file rackunit)
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(match-define (list card-pubkey door-pubkey) '(18356117 5909654))
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(define (transform subject-number [break-proc void])
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(for/fold ([val 1]
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[count 0]
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#:result (cons val count))
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([i (in-naturals)]
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#:break (break-proc val i))
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(values (remainder (* val subject-number) 20201227) (add1 count))))
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(define card-loop-size (cdr (transform 7 (λ (val i) (eq? val card-pubkey)))))
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(define door-loop-size (cdr (transform 7 (λ (val i) (eq? val door-pubkey)))))
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(check-equal? (car (transform card-pubkey (λ (val i) (eq? i door-loop-size)))) 16902792) |