/in/foo.cc: In function 'int main()':
/in/foo.cc:13:25: error: 'sum' was not declared in this scope
   13 |                         sum+=s%10;
      |                         ^~~
/in/foo.cc:14:25: error: 'cnt' was not declared in this scope; did you mean 'int'?
   14 |                         cnt+=sum*s*s;
      |                         ^~~
      |                         int
/in/foo.cc:17:20: error: 'cnt' was not declared in this scope; did you mean 'int'?
   17 |                 if(cnt==n)
      |                    ^~~
      |                    int