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Usage: paren(0,4,'')
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| #Usage: paren(0,4,'') | |
| def paren(sum,remaining,str): | |
| if sum < 0: | |
| return | |
| if remaining == 0: | |
| print str+')'*sum | |
| return | |
| paren(sum+1,remaining-1,str+'(') | |
| paren(sum-1,remaining,str+')') |
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