Unfortunately, we had a bug in our interactor of the interactive problem.↵
↵
The interactor contains the following code:↵
↵
~~~~~↵
if (y < x)↵
t = -1;↵
else if(y > x)↵
t = 1;↵
else↵
t = 0;↵
if(!p[q % n])↵
t *= -1;↵
cout << t << "\n" << flush;↵
~~~~~↵
↵
This is the opposite to the statement. However, it turns out that this error doesn't causes any harm for solving problem — it actualy just inverts the pattern, selected by judges. This also wasn't noticed during testing, by the same reason -- the error **is not visible to the user code**.↵
↵
But it may cause unexpected behaviour for hackers -- since they write the pattern themselves.↵
↵
We are very sorry for this error and decided to do the following:↵
↵
\begin{itemize}↵
\item- The round will be rated, because very little people got affected (the people, who made incorrect hack) ↵
\item- If you made a hack, which turned to be incorrect due to the error, we will cancel your $-50$ points and recalculate your rating afterwards. Please PM me if you have such a hack.↵
\end{itemize}↵
↵
We are very sorry again. This is a huge lesson to us to be more attentive.↵
↵
I hope you enjoyed the round.
↵
The interactor contains the following code:↵
↵
~~~~~↵
if (y < x)↵
t = -1;↵
else if(y > x)↵
t = 1;↵
else↵
t = 0;↵
if(!p[q % n])↵
t *= -1;↵
cout << t << "\n" << flush;↵
~~~~~↵
↵
This is the opposite to the statement. However, it turns out that this error doesn't causes any harm for solving problem — it actualy just inverts the pattern, selected by judges. This also wasn't noticed during testing, by the same reason -- the error **is not visible to the user code**.↵
↵
But it may cause unexpected behaviour for hackers -- since they write the pattern themselves.↵
↵
We are very sorry for this error and decided to do the following:↵
↵
\item
\end{itemize}↵
↵
We are very sorry again. This is a huge lesson to us to be more attentive.↵
↵
I hope you enjoyed the round.
