Comparing array

Find the difference between input 1's ids and input 0's:

int delete_ids[] = array();

int numPrims = nprimitives(1);
for (int i = 0; i < numPrims; i++) {
    int leaf_id = prim(1, "leafid", i);
    append(delete_ids, leaf_id);
}

int my_id = i@leafid;

if (find(delete_ids, my_id) >= 0) {
    @group_keep=1;
}