Created
November 17, 2012 02:56
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A palindrome is a sentence that reads the same backward as forward.
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| (define (pal-helper wd) | |
| (cond ((<= (count wd) 1) #t) | |
| ((equal? (first wd) (last wd)) | |
| (and #t (pal-helper (bl (bf wd))))) | |
| (else #f))) | |
| (define (palindrome? sent) | |
| (pal-helper (accumulate word sent))) |
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use "leap of faith" as the basic approach to solving this kind of problem that can be reduced to similar, smaller subproblems