Web Reference: When you encounter a closing bracket, check if the top of the stack was the opening for it. If yes, pop it from the stack. Otherwise, return false. In-depth solution and explanation for LeetCode 20. Valid Parentheses in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. Iterate through the string by index. For an opening bracket, push it onto the stack. If the bracket is a closing type, check for the corresponding opening bracket at the top of the stack. If we don't find the corresponding opening bracket, immediately return false.
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