For wa#3:
4 0
0 3
0 0
YES

For wa#4
0 0
5 0
6 5
YES

For wa#5
0 0
4 0
2 3
The possible answer is:
NO
0.00000000000000000000 0.00000000000000000000
4.00000000000000000000 0.00000000000000000000
0.46153846153846145000 0.69230769230769285000

But i still have have wa#31. I think, I have problem with precision. Can anyone tell me how to avoid this problem?

UPD: Finaly AC. I think, it realy was a problem with precision, but I am not sure.

Edited by author 27.07.2011 22:20

Edited by author 27.07.2011 23:58

Yes, problem in precision.
EPS = 1e-10 AC
EPS = 1e-11 WA#36