OJ Board

Simple question:

let start-configuration:

0: 0 1 2 3 4 5
1:
2:
3:
4:
5:

whats next configuration after
move 1 over 3
is it:
a)
0: 0 1
1:
2: 2
3: 3
4: 4
5: 5

or
b)
0: 0
1:
2: 2
3: 3 1
4: 4
5: 5
???
so the question is:
first remove all blocks stacked on 1 and then put 1 on the block with 3 AFTER ...

Hello,

i have sent a solution to judge@uva.es about one hour ago, but haven