3
2 3 0
1 0
1 0


ans
1
1


test2

4
2 3 0
1 0
1 4 0
3 0

output
2
1 3


the sample problem given here has given me this output
4
1 4 5 6

is this solution correct please help.

please suggest some test cases.

Edited by author 03.04.2008 13:54