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Generate Paranthesis.py

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class Solution(object):

def generateParenthesis(self, N):

if N == 0: return ['']

ans = []

for c in xrange(N):

for left in self.generateParenthesis(c):

for right in self.generateParenthesis(N-1-c):

ans.append('({}){}'.format(left, right))

return ans