Some users have been submitting weird solutions like https://codeforces.com/contest/1426/submission/94086728 recently, where the code has random declaration and initialization of arrays. I think this is a cheating attempt and codeforces has not been able to handle this type of plagiarisms.
The user in question also has multiple similar submissions, for example https://codeforces.com/contest/1406/submission/92627162 where they have done the same thing for no explainable reason.
I think this type of submissions should be examined. MikeMirzayanov