Sabbir_omi is a cheater.I have a very strong proof which completely shows that this person is cheating. In Codeforces Div. 2 Round 1099, his submission for Problem F -> 375530820 clearly indicates AI (if(cin>>t)) if(!cin>>n...) etc. and incredibly structured code). Also, he submitted this code 375527316 in the same contest in python and within 6 mins he solved the next problem (problem F) in C++!!. Even LGM's don't solve problem F so fast. I hope MikeMirzayanov, and KAN would investigate into this user and would take necessary action. I would appreciate if you would link more such cheaters in the comments for the good of all.