cpp-flashcards/org/study_deck_02/dsa/greedy/0678-valid-parenthesis-string.org

#+ANKI_DECK: study_deck_02
* TODO 0678. Valid Parenthesis String :medium:
:PROPERTIES:
:NEETCODE: [[file:../../roadmap.org::*0678. Valid Parenthesis String][0678. Valid Parenthesis String]]
:END:

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:*


#+begin_src
Input: s = "()"
Output: true
#+end_src
*Example 2:*


#+begin_src
Input: s = "(*)"
Output: true
#+end_src
*Example 3:*


#+begin_src
Input: s = "(*))"
Output: true
#+end_src


*Constraints:*

 - ~1 <= s.length <= 100~

 - ~s[i]~ is ~'('~, ~')'~ or ~'*'~.

** TODO Approach
Write your approach here.

** TODO Python
#+begin_src python
class Solution:
    def checkValidString(self, s: str) -> bool:
#+end_src

** TODO C++
#+begin_src cpp
class Solution {
public:
    bool checkValidString(string s) {
        
    }
};
#+end_src