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16 lines
582 B
Racket
16 lines
582 B
Racket
7 years ago
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#lang reader "../aoc-lang.rkt"
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7 years ago
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(provide (rename-out [#%mb #%module-begin]))
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(define-macro (#%mb (STARS) (NUMBER ...) ...)
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#'(#%module-begin (checksum 'STARS '((NUMBER ...) ...))))
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(define (checksum stars intss)
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(define (max-min-diff ints) (- (apply max ints) (apply min ints)))
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(define (no-remainder ints)
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(for*/first ([duo (in-combinations ints 2)]
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[result (in-value (apply / (sort duo >)))]
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#:when (integer? result))
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result))
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(define row-proc (if (eq? stars '★) max-min-diff no-remainder))
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(apply + (map row-proc intss)))
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