leetcode/0020_valid-parentheses/README.md

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Given a string `s` containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.
An input string is valid if:
1. Open brackets must be closed by the same type of brackets.
2. Open brackets must be closed in the correct order.
**Example 1:**
Input: s = "()"
Output: true
**Example 2:**
Input: s = "()[]{}"
Output: true
**Example 3:**
Input: s = "(]"
Output: false
**Constraints:**
* `1 <= s.length <= 104`
* `s` consists of parentheses only `'()[]{}'`.