Web Reference: Valid Parentheses - Given a string s containing just the characters ' (', ')', ' {', '}', ' [' and ']', determine if the input string is valid. An input string is valid if: 1. 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. In a valid parenthesis expression, every opening bracket must have a corresponding closing bracket. The stack is used to process the valid string, and it should be empty after the entire process.
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