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Fixed bug where an empty stack would cause error

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This commit is contained in:
Mikael Souza 2018-12-17 10:45:54 -04:00
parent a8cfc14737
commit 2e2fadf4db
1 changed files with 3 additions and 1 deletions
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4
data_structures/stacks/balanced_parentheses.py
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@ -12,8 +12,10 @@ def balanced_parentheses(parentheses):
if parenthesis == '(': if parenthesis == '(':
stack.push(parenthesis) stack.push(parenthesis)
elif parenthesis == ')': elif parenthesis == ')':
if stack.is_empty():
return False
stack.pop() stack.pop()
return not stack.is_empty() return stack.is_empty()
if __name__ == '__main__': if __name__ == '__main__':