Valid Parentheses

Given a string s containing only '(', ')', '{', '}', '[', and ']', determine if the input string is valid.

A 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: false

Constraints:

• 1 ≤ s.length ≤ 10⁴
• s consists only of parentheses characters