/in/foo.cc: In function 'int main()':
/in/foo.cc:19:44: warning: format '%d' expects argument of type 'int*', but argument 4 has type 'long long int*' [-Wformat=]
   scanf("%d%d%d", &a[i].x, &a[i].y, &a[i].v);
                                     ~~~~~~~^