/in/foo.cc: In function 'int main()':
/in/foo.cc:21:9: error: 'i' was not declared in this scope
     for(i = 0; i < n; i++)
         ^
/in/foo.cc:34:13: error: 'j' was not declared in this scope
         for(j = 0; j < n; j++)
             ^