My program gives the following answers:
1  -> 10
2  -> 45
3  -> 165
10 -> 43749
40 -> 45433800
80 -> 9
81 -> 1

Why do I get WA1?

Edited by author 13.07.2012 14:17

Your solution is correct for every case. But whats your answer for 0? I think it should be 1. But its not testing case 0.

Edited by author 06.05.2013 19:19

Edited by author 06.05.2013 19:19

Edited by author 06.05.2013 19:21