Valid Parentheses (#20)

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.

Company Tags: Adobe, Flipkart

Core Concept: Stack, Parentheses Matching

Solve on LeetCode