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If the stack is empty, len(res) will be 0, so len(res) - 1 will be an index of -1. Trying to access an index in an empty string causes an "IndexError: string index out of range" in Python.
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If the stack is empty, len(res) will be 0, so len(res) - 1 will be an index of -1. Trying to access an index in an empty string causes an "IndexError: string index out of range" in Python.