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