Very good problem. Thx to autors!

Some tests, that helped me to to solve that problem.
7
2 7 0
3 0
4 0
5 0
3 0
1 0
6 0
answer:
1 6 7 0

9
3 5 0
3 0
2 8 0
5 0
4 6 0
7 9 0
6 0
9 0
0
answer: 1 0

9
2 0
3 4 0
1 0
5 8 0
6 0
4 0
3 8 0
9 0
7 0
answer:
1 2 3 4 5 6 7 8 9 0

3
2 0
3 0
0
answer:
1 0

3
2 0
3 0
1 0
answer:
1 2 3 0

5
2 0
3 0
0
3 0
4 0
answer:
0

4
2 3 0
1 0
0
1 0
answer:
4 0

Edited by author 05.12.2009 04:56

Thx !