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. Your task is to determine if the string is valid, meaning all opening brackets are closed by the same type in the correct order. Return True if valid, False otherwise.
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