Leetcode 20 Valid Parentheses ( Valid Parentheses *Easy* ) Problem Analysis

Original link: https://nicksxs.me/2022/07/02/Leetcode-20-%E6%9C%89%E6%95%88%E7%9A%84%E6%8B%AC%E5%8F% B7-Valid-Parentheses-Easy-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/

Topic introduction

Given a string s containing just the characters

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