Created
September 19, 2013 16:50
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Find the longest palandrom in a given string, using functional programming and recursion in python.
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| def sliding(iterable, n): | |
| return [iterable[i:i+n] for i in range(len(iterable) - n + 1)] | |
| def xsliding(iterable, n): | |
| for i in range(len(iterable) - n + 1): | |
| yield iterable[i:i+n] | |
| def reversed_iter(iterable): | |
| return iterable[::-1] | |
| def find(iterable, f): | |
| for i in iterable: | |
| if f(i): | |
| return i | |
| return None | |
| def longestPal(s): | |
| return longestPalN(s, len(s)) | |
| def longestPalN(s, n): | |
| found = find(xsliding(s, n), lambda x: x == reversed_iter(x)) | |
| if found: | |
| return found | |
| return longestPalN(s, n-1) | |
| s = "a bbb adsf adsfjdsjidk uuuuuiiiiiuuuuu " | |
| print longestPal(s) |
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