Web Reference: Mastering Leetcode Problem-Solving Using Simple JavaScript. 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. 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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