10 3 -> 3 3 4 -> 2 5 7 8 9 10 2 4 5 8 -> 3 5 6 9 10 4 5 7 8 1 -> 4 3 1 10 10 8 3 7 8 5 -> 4 7 9 10 3 5 6 8 7 2 -> 2 3.5 4.5 5 1.5 2.5 3 4 3.5 2 ->