/in/foo.cc: In function 'int main()':
/in/foo.cc:15:86: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
   printf ("%d\n", upper_bound(a + 1, a + N + 1, r) - lower_bound(a + 1, a + N + 1, l));
                                                                                      ^