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 678. Valid Parenthesis String in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. We need to check if a string containing '(', ')', and '*' can be interpreted as a valid parentheses string. A helpful way to solve this is to track how many opening parentheses are currently unmatched:
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