Web Reference: Valid Parenthesis String - Given a string s containing only three types of characters: ' (', ')' and '*', return true if s is valid. The following rules define a valid string: * Any left parenthesis ' (' must have a corresponding right parenthesis ')'. 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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