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. valid parentheses must always appear in matching pairs like "()", "{}", or "[]". So if the string is valid, we can repeatedly remove these matching pairs until nothing is left. If, after removing all possible pairs, the string becomes empty, then the parentheses were properly matched.
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