/in/foo.cc: In function 'void brute_inversions::work()':
/in/foo.cc:37:32: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
   printf("%I64d\n",inversions());
                    ~~~~~~~~~~~~^
/in/foo.cc: In function 'void a_less_than_or_equal_to_10::work()':
/in/foo.cc:61:23: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
   printf("%I64d\n",ans);
                       ^