Hello MikeMirzayanov, In the last div 3 [Round #713] some of the contestants faced an interesting issue which is, after rejudging problem G because of avoiding invalid hacks some of the pretests passed codes gets TLE in the pretest cases. And when we resubmit the same code again unofficially, it passed all cases gets Accepted(for evidence you can go through over the comments section). So, in this case, we don't think it is fair for those contestants. We expect a proper justification from codeforces and we believe codeforces will provide that. Thanks.