Valid Parentheses

time limit per test: 5 seconds
memory limit per test: 100 megabytes

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.
  • 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: true

 

Constraints:

  • 1 <= s.length <= 104
  • s consists of parentheses only '()[]{}'.



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Input: ()[]{}

Expected Output: true

Input: ()

Expected Output: true

Input: (]

Expected Output: false

Input: ([])

Expected Output: true