/in/foo.cc: In function 'int main()':
/in/foo.cc:46:24: error: 'cout' was not declared in this scope
  for (int i=0;i<ne;i++)cout << e[i].x << " " << e[i].y << endl;
                        ^~~~
/in/foo.cc:46:59: error: 'endl' was not declared in this scope
  for (int i=0;i<ne;i++)cout << e[i].x << " " << e[i].y << endl;
                                                           ^~~~