OJ Board

if you are using c, c++, just use:

C++:
printf("%E\n",ans);

Is it possible to give the output by the above process without losing precision?

I don't now, but I used this code and got WA

I use that to solve this problem.

for that contest I think judge fix their IO, so more contestant get AC in this problem. so you can check again your statistic in contest, maybe you got AC for this problem.

Thanks, you are right. Finally I got Acc.