LeetcodeValid Parentheses
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题目链接：https://leetcode.com/problems/valid-parentheses/
题目：
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.
思路：
用栈，easy。。
算法：