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Paste # 26672 | ||
2016-04-29 21:23:19 | ||
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#lang racket (define plus-minus (lambda (L sum target) (cond ((null? L) (= sum target)) ((= target sum) #t) ((plus-minus (cdr L) (+ sum (car L)) target)) (else (plus-minus (cdr L) (- sum (car L)) target)))))