/in/foo.cc: In function 'int main()':
/in/foo.cc:19:87: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
    printf ("%d\n", upper_bound(x + 1, x + n + 1, r) - lower_bound(x + 1, x + n + 1, l));
                                                                                       ^
/in/foo.cc:24:87: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
    printf ("%d\n", upper_bound(y + 1, y + n + 1, r) - lower_bound(y + 1, y + n + 1, l));
                                                                                       ^