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Paste # 30378 | ||
2016-04-30 11:13:32 | ||
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#lang racket (define plus-minus (lambda (L sum target) (cond ((null? L) (= sum target)) ((plus-minus (cdr L) (+ sum (car L)) (car L)) #t) ((plus-minus (cdr L) (- sum (car L)) (car L)) #t) (else #f))))