I calculated points in double.
I made all comparings with abs(a-b)<eps;
But
eps = 10^-9. - AC
eps = 10^-8. - AC
eps = 10^-7. - AC
eps = 10^-6. - AC
eps = 10^-5. - AC
eps = 10^-4. - AC
eps = 10^-3. - AC
eps = 10^-2. - AC
eps = 10^-1. - AC
eps = 10^1. - AC
eps = 10^2. - AC
eps = 10^3. - AC!!!!
eps = 10^4. - WA1.
So... I do not know much about contests rules, but it seemes strange for me)