Valid Parentheses

Easy~15 min

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: true
Example 2
Input: s = "()[]{}"
Output: true
Example 3
Input: s = "(]"
Output: false

Constraints

  • 1 <= s.length <= 10^4
  • s consists of parentheses only: '()[]{}'
  • Expected time complexity: O(n)
Code
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Output

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