Given a string `s` containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.
An input 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.
Examples
Example 1
Input:
s = "()"Output:
trueExample 2
Input:
s = "()[]{}"Output:
trueExample 3
Input:
s = "(]"Output:
falseConstraints
- •
1 <= s.length <= 10^4 - •
s consists of parentheses only '()[]{}'.
Code Editor