020-valid-parentheses

Question

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

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.

Example:

Thought Process

1. AAAAAA

Solution

Additional