I had WA 101 and didn't know what is wrong.
I tried test "0 0 1" and got something like '0 3'. I fixed it, but nothing changed.
Then I realized that the problem is not only for zeros, but for all k=l and n=1, my output was '0 3'. When I fixed it, I got AC.
By the way, big thanks for hints for WA 5 and 90, they helped me a lot.

Edited by author 18.08.2015 20:20