Not an issue.

I can not undestand. Why the fire_drill test
6 {0,0,0,0}
5 {0,0,0,0}
4 {0,0,0,0}
3 {0,0,0,0}
2 {0,0,0,0}
1 {0,0,0,0}
0 {}
has the result:
[0, 6, 5, 4, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 4, 3, 2, 1, 0, 3, 2, 1, 0, 1, 0] with capacity 5.
Why does the lift stop at 4, 3, 2, 1 floors after he took four people on the fifth floor and another one on the fourth? Shouldn't he then go down to the ground floor to drop them off? I use С++