Created
November 17, 2012 03:11
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A substring is a subset whose letters come consecutively in the original word.
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| (define (substrings wd) | |
| (if (empty? wd) | |
| (se "") | |
| (se (sub-helper wd) (substrings (bf wd))))) | |
| (define (sub-helper wd) | |
| (if (= 1 (count wd)) | |
| (se wd) | |
| (se wd (sub-helper (bl wd))))) |
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