/in/foo.cc: In function 'int main()':
/in/foo.cc:9:25: error: 'sum' was not declared in this scope
    9 |                 while(n)sum+=n%10,n/=10;
      |                         ^~~
/in/foo.cc:10:34: error: expected ';' before '}' token
   10 |                 if(s_==5)c++,s+=i
      |                                  ^
      |                                  ;
   11 |         }
      |         ~