Created
August 8, 2011 12:39
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| def paren(n): | |
| if n == 1: | |
| return ['()'] | |
| results = paren(n-1) | |
| coms = set() | |
| for i in results: | |
| coms.add('()'+i) | |
| coms.add('('+i+')') | |
| coms.add(i+'()') | |
| return coms | |
| from pprint import pprint | |
| pprint(paren(4)) |
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