18 lines
443 B
Racket
18 lines
443 B
Racket
#lang racket
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(with-input-from-file "../input/01"
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(lambda ()
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(for/fold ([cnt 0]
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[last null]
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#:result cnt)
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([line (in-lines)])
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(let ([num (string->number line)])
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(if (< (length last) 3)
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(values cnt (append last (list num)))
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(values
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(if (> num (car last))
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(+ cnt 1)
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cnt)
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(append (cdr last) (list num))))))))
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