upd

org/study_deck_02/dsa/stack/0020-valid-parentheses.org

@@ -54,13 +54,13 @@ An input string is valid if:
 Write your approach here.
 
 ** TODO Python
-#+begin_src python
+#+begin_src python :lc-problem 20 :lc-lang python3
 class Solution:
     def isValid(self, s: str) -> bool:
 #+end_src
 
 ** TODO C++
-#+begin_src cpp
+#+begin_src cpp :lc-problem 20
 class Solution {
 public:
     bool isValid(string s) {