Problem: Valid Parentheses

Statement

Given a string s consisting only of the characters '(', ')', '{', '}', '[', and ']', determine whether the string represents a valid sequence of brackets.

A string is considered valid if all of the following conditions are satisfied:

• Every opening bracket is closed by a bracket of the same type.

• Brackets are closed in the correct (properly nested) order.

• Every closing bracket has a matching opening bracket of the same type.

Return True if the string is valid, and False otherwise.

Constraints:

• $1 \leq$ s.length $\leq 10^4$ ...