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35 lines
904 B
Racket
35 lines
904 B
Racket
6 years ago
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#lang debug br
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(require sugar/cache)
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(define (hundreds-digit x)
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(quotient (modulo x 1000) 100))
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(define current-serial (make-parameter 0))
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(define/caching (power-at x y)
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(define rack-id (+ x 10))
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(- (hundreds-digit (* (+ (* rack-id y) (current-serial)) rack-id)) 5))
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(define (grid-scores size-min [size-max size-min])
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(for*/list ([side (in-range size-min (add1 size-max))]
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[x (in-range 1 (- 301 side))]
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[y (in-range 1 (- 301 side))])
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(list x y
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(for*/sum ([x (in-range x (+ side x))]
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[y (in-range y (+ side y))])
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(power-at x y)))))
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(define (★)
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(parameterize ([current-serial 7803])
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(take (argmax third (grid-scores 3)) 2)))
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#;(grid-scores 1 300)
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#;(define (★★)
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)
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#;(★★)
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(module+ test
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(require rackunit)
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#;(check-equal? (time (★)) '(20 51))
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#;(check-equal? (time (★★)) _))
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