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• 0678. Valid Parenthesis String
  • Approach
  • Python
  • C++

TODO 0678. Valid Parenthesis String   medium

Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.

The following rules define a valid string:

• Any left parenthesis '(' must have a corresponding right parenthesis ')'.
• Any right parenthesis ')' must have a corresponding left parenthesis '('.
• Left parenthesis '(' must go before the corresponding right parenthesis ')'.
• '*' could be treated as a single right parenthesis ')' or a single left parenthesis '(' or an empty string "".

Example 1:

Input: s = "()"
Output: true

Example 2:

Input: s = "(*)"
Output: true

Example 3:

Input: s = "(*))"
Output: true

Constraints:

• 1 <= s.length <= 100
• s[i] is '(', ')' or '*'.

TODO Approach

Write your approach here.

TODO Python

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

TODO C++

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