/in/foo.cc: In function 'int main()':
/in/foo.cc:39:35: warning: format '%d' expects argument of type 'int', but argument 2 has type '__gnu_cxx::__enable_if<true, double>::__type {aka double}' [-Wformat=]
     printf("%d\n",abs(d[y]-d[x])-1);
                                   ^