Valid Parentheses

[vishakha-managoli]

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

An input string is valid if:

Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct order.

[vishakha-managoli]

My name is Vishakha Managoli .Please assign this problem to me . I want to provide an optimized solution to this problem in C++ language.