40 lines
776 B
Python
40 lines
776 B
Python
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def main():
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str = "([{{}])"
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roundStack = []
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squareStack = []
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curlyStack = []
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# push all to stack
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for i in range(0, len(str)):
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char = str[i]
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if char == "(":
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roundStack.append("(")
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elif char == "[":
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squareStack.append("[")
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elif char == "{":
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curlyStack.append("{")
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# iterate str backwards
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for char in reversed(str):
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if char == ")":
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roundStack.pop()
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elif char == "]":
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squareStack.pop()
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elif char == "}":
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curlyStack.pop()
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if not roundStack and not squareStack and not curlyStack:
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print 'parenthese are valid'
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else:
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print 'parenthese are NOT valid'
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if __name__ == "__main__":
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main()
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