[1, 0, 0, 0, 0]
[1, 0, 0, 2, 0]
[1, 0, 3, 2, 0]
[1, 0, 3, 2, 4]
[5, 1, 3, 2, 4]
[5, 1, 3, 2, 4]
5 1 3 2 4