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• 0020. Valid Parentheses
  • Approach
  • Python
  • C++

TODO 0020. Valid Parentheses   easy

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

Example 5:

Input: s = "([)]"

Output: false

Constraints:

• 1 <= s.length <= 10^{4}
• s consists of parentheses only '()[]{}'.

TODO Approach

Write your approach here.

TODO Python

class Solution:
    def isValid(self, s: str) -> bool:

TODO C++

class Solution {
public:
    bool isValid(string s) {
        
    }
};