Added solution for the "Valid Parentheses" problem. This function checks if a given string of parentheses, brackets, and curly braces is valid by ensuring each opening bracket has a corresponding closing bracket in the correct order. The solution uses a stack to match brackets efficiently.
Added solution for the "Valid Parentheses" problem. This function checks if a given string of parentheses, brackets, and curly braces is valid by ensuring each opening bracket has a corresponding closing bracket in the correct order. The solution uses a stack to match brackets efficiently.
-- This is a simpler version of the previous PR.