Valid Parentheses Leetcode Project Python RbM NLpM2KM

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. View eg24eg's solution of Valid Parentheses on LeetCode, the world's largest programming community. In a valid parenthesis expression, every opening bracket must have a corresponding closing bracket. The stack is used to process the valid string, and it should be empty after the entire process.

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