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. Mastering Leetcode Problem-Solving Using Simple JavaScript. Stack is widely known as LIFO (last-in, first-out) data structure. It's commonly used in undo mechanisms in text editors and compiler syntax checking for matching brackets and braces.
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