0
1
1
9
2
3
4
5
6
6
6
8
7
[10, 3, 6, 8, 4, 5, 1, 7, 2, 9]
[[1], [2, 9], [3], [4], [5], [6], [7, 8, 9], [8], [9], [10]]
[0, 1, 2, 3, 4, 5, 6, 7, 7, 2]
2