Codeforces community (especially : wuhudsm, MikeMirzayanov) please look into this:

This user ckuhn222 seems suspicious to me by his/her shady problem submission's.

Just after submitting A in div 1 in c++, they submit F1 in a minute in python (which i don't even think LGM'S can do) but it goes for Idleness limit exceeded on pretest 1 and then after 6 mins submits problem E which again fails. This seems like they were just trying their best to copy paste solutions from various sources which eventually has passed in future leading them to reach master from newbie in span of 5 months.

I won't explain alot, you can kindly have a look at their profile.

If i am wrong I will delete this post & sorry ckuhn222 if i am wrong.