which answer?
n=11,k=5, '1 2 3 4 5 6 7 8 9 10 11';
1 4 7 10 ?
2 5 8 11 ?
3 6 9 ? ?
or
1 4 6 8 10
2 5 7 9 11
3 ? ? ?

I think this is incorrect test. There is no solution.

My AC program show :
1 3 5 7 9 11
2 4 6 8 10

Edited by author 11.03.2009 15:54