I was looking at the standings of CodeTON Round 6 (Div. 1 + Div. 2, Rated, Prizes!), and I noticed this person submitted problems in reverse order and very fast, which made me very suspicious.
I investigated more and found out that he had one more account that also participated in the contest.
It was obvious they were the accounts of the same person because they had similar names and organizations and used exactly the same template in the past.
Then I started looking at the codes.
It was obvious that the codes submitted by TimaDegt were changed versions of the codes submitted by TimDee. He wanted to escape the plagiarism detector, and he was successful because his account didn't get skipped. However, the similarities are obvious. The codes of TimaDegt use the same defines and coding habits, like whitespaces and newlines.
However, this isn't a good enough proof. If it weren't for a mistake he made, he would've gotten away with it.
He submitted exactly the same code from both accounts, which proves he used both accounts in the contest.
I looked at other contests and found many more contests where he also used both accounts. They're also full of many "coincidences".
- Codeforces Round 867 (Div. 3)
- Codeforces Round 855 (Div. 3)
- Codeforces Round 853 (Div. 2)
- Codeforces Round 851 (Div. 2)
- Codeforces Round 843 (Div. 2)
- Educational Codeforces Round 141 (Rated for Div. 2)
- Codeforces Round 842 (Div. 2)
- Codeforces Round 841 (Div. 2) and Divide by Zero 2022
- Codeforces Round 850 (Div. 2, based on VK Cup 2022 - Final Round) Codeforces Round 850 (Div. 1, based on VK Cup 2022 - Final Round)
People wouldn't expect a high-rated person to cheat, but he did. He's also a medalist from IOI 2023 (Timur Degteari), which only makes things worse. I hope the 2 TON he earned from cheating was worth ruining his reputation. I also hope that Codeforces gets better at cheater detection.