/in/foo.cc: In function 'int main()':
/in/foo.cc:19:13: error: 'cnt' was not declared in this scope; did you mean 'int'?
   19 |             cnt++;
      |             ^~~
      |             int
/in/foo.cc:20:11: error: 'cnt' was not declared in this scope; did you mean 'int'?
   20 |     cout<<cnt;
      |           ^~~
      |           int