pls help.Can any one give the output for the above test cases
and explain why is it like that?

n = 5 k =4
1 2 3 4 5
1 round : 1 2 3 5 4
2 round : 1 2 5 4 3
3 round : 1 5 4 3 2
4 round : 5 4 3 2 1
6 round : 5 4 3 1 2
answer 5 4 3 1 2

n = 6 k = 2
1 2 3 4 5 6

1 round : 1 3 4 5 6 2
2 round : 1 3 5 6 2 4
3 round : 1 3 5 2 4 6
4 round : 1 3 5 2 6 4
5 round : 3 5 2 6 4 1
6 round : 3 2 6 4 1 5
answer 3 2 6 4 1 5

What's that sh!t?

n = 5, k = 4
4 3 5 2 1

n = 6, k = 2
2 4 6 3 1 5