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remove-outer-parantheses.py

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def removeOuterParentheses(self, S: str) -> str:

result = []

start = 0

count = 0

for idx, char in enumerate(S):

count += 1 if char == '(' else -1

if count == 0:

result.append(S[start+1:idx])

start = idx + 1

return "".join(result)