The winner of the last round, win114514 clearly cheated. If we look at their submissions, problems A, B, C and D were written on a different template than E and F. And submission times are also really suspicious: C and E were submitted almost at the same time, and D and F too, without any gaps between submission times to have time to do them. It looks a lot like two people were doing the contest, one solved the first 4 problems and the other solved the last 2.
Edit: I've seen that they are not in the Final Standings anymore, moreover they are the last in the ranking and lost a ton of points. Thanks a lot!
