README.md

Valid Parentheses

https://leetcode.com/problems/valid-parentheses/description/

Problem Description

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.
3. Every close bracket has a corresponding open bracket of the same type.

Example 1

Input: s = "()"
Output: true

Example 2

Input: s = "()[]{}"
Output: true

Example 3

Input: s = "(]"
Output: false

Example 4

Input: s = "([])"
Output: true

Constraints

1. 1 <= s.length <= 104
2. s consists of parentheses only '()[]{}'.