Check those 2 particular cases:
0
3
2
3
5
the answer shoud be 1 2 3 [even if u can find sum 5 in 2 ways (2,3)and(5)]
and
5
4
2
3
4
5
the answer shoud be -1 because u can find sum 5 in 2 ways, and also sum 9 in 2 ways.

Edited by author 17.03.2005 13:18