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