35 lines
1.1 KiB
Scheme
35 lines
1.1 KiB
Scheme
(define (count-increase text-port previous count)
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(let [(line (get-line text-port))]
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(if (eof-object? line)
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count
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(let [(number (string->number line))]
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(count-increase text-port number
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(+ count (if (> number previous) 1 0)))))))
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(let [(file (open-input-file "input"))]
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(display "part 1: ")
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(display (count-increase file 100000 0))
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(newline)
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(close-port file))
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(define (count-increase-sliding text-port triplet previous-sum count)
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(let [(line (get-line text-port))]
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(if (eof-object? line)
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count
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(let* [(number (string->number line))
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(triplet (list (cadr triplet) (caddr triplet) number))
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(sum (+ (car triplet) (cadr triplet) (caddr triplet)))]
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(count-increase-sliding text-port triplet sum
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(+ count (if (> sum previous-sum) 1 0)))))))
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(define (read-number text-port)
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(string->number (get-line text-port)))
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(let* [(file (open-input-file "input"))
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(triplet (list (read-number file) (read-number file) (read-number file)))
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(sum (+ (car triplet) (cadr triplet) (caddr triplet)))]
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(display "part 2: ")
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(display (count-increase-sliding file triplet sum 0))
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(newline)
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(close-port file))
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