/in/foo.cc: In function 'int main()':
/in/foo.cc:14:72: 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,y)-lower_bound(a+1,a+n+1,x));
                                                                        ^