/in/foo.cc: In function 'int main()':
/in/foo.cc:17:59: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'double*' [-Wformat=]
     for (int i=0; i<n; i++) scanf("%d%d", &a[i].x, &a[i].y);
                                                           ^
/in/foo.cc:17:59: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'double*' [-Wformat=]