master
Matthew Butterick 3 years ago
parent 2f92fcc170
commit 4f58128ddc

@ -0,0 +1,18 @@
#lang br
(require racket/file srfi/13 rackunit)
(define (seat-id seat)
(for/sum ([(c i) (in-indexed (string-reverse seat))]
#:when (memv c '(#\R #\B)))
(arithmetic-shift 1 i)))
(define seat-ids (map seat-id (file->lines "05.rktd")))
(check-equal? (apply max seat-ids) 915)
(check-equal?
(for/first ([first (sort seat-ids <)]
[second (cdr (sort seat-ids <))]
#:when (= 2 (- second first)))
(sub1 second))
699)

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