/in/foo.cc: In function 'int main()':
/in/foo.cc:7:11: warning: right operand of comma operator has no effect [-Wunused-value]
  for(i=0,i<n,i++)
          ~^~
/in/foo.cc:7:17: error: expected ';' before ')' token
  for(i=0,i<n,i++)
                 ^
/in/foo.cc:15:14: error: 'penalty' was not declared in this scope
  printf("%d",penalty);
              ^~~~~~~
/in/foo.cc:16:2: error: expected primary-expression before 'return'
  return 0;
  ^~~~~~
/in/foo.cc:16:2: error: expected ')' before 'return'