Leetcode-Question-20: Valid Parentheses

原文链接:
https://leetcode.com/problems/valid-parentheses/

题目描述:
Valid Parentheses
Difficulty: Easy

Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid.

The brackets must close in the correct order, “()” and “()[]{}” are all valid but “(]” and “([)]” are not.

解析: