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62 lines
1.3 KiB
62 lines
1.3 KiB
11 months ago
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#!/usr/bin/guile -s
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!#
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(use-modules (ice-9 rdelim))
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(define (read-lines)
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(let loop ((line (read-line)))
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(if
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(eof-object? line)
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'()
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(cons line (loop (read-line))))))
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(define (map list mapper)
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(if
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(null? list)
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'()
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(cons (mapper (car list)) (map (cdr list) mapper))))
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(define (first-last-combine current rest)
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(if
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(null? current)
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rest
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(if
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(null? rest)
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current
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(cons (car current) (cdr rest)))))
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(define (first-last list predicate)
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(if
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(null? list)
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'()
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(first-last-combine
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(if
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(predicate (car list))
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(cons (car list) (cons (car list) '()))
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'())
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(first-last (cdr list) predicate))))
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(define (sum numbers)
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(if
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(null? numbers)
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0
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(+ (car numbers) (sum (cdr numbers)))
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))
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(define (solve-line line)
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(
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#!(lambda (first-last-result) (sum (map first-last-result (lambda (char) (string->number (string char))))))!#
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(lambda (first-last-result) (string->number (list->string first-last-result)))
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(first-last
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(string->list line)
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(lambda (char) (if (char-numeric? char) #t #f)))))
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(define (solve-all lines)
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(if
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(null? lines)
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0
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(+ (solve-line (car lines)) (solve-all (cdr lines)))
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))
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(display (solve-all (read-lines)))
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