Today I got this message:

When looking at the solutions of the listed participants on the problem 1951B I saw that all these solutions completely (or with a change of variables) same as mine, so it's not just a coincidence, solutions copied from mine. Since I didn't give my solution to anyone, and didn't keep the code publicly available, this could only happen if one of the participants blocked this task, copied my code, and sent it to the others.

Indeed, it turns out that in my room only one participant blocked task B — _Untrackable_(the nickname speaks for itself). He blocked this task at 1:44, and if you look at the submissions of participants from the list, you can see that many of them earlier sent code for this task that was completely different from mine (some even in other languages!), but all of them at approximately 1:55 (after he blocked this task), sent almost exactly my code.

This method of cheating at contests allows the person who sends solutions to everyone to remain unpunished, and all the punishment goes to another honest participant.

Please look at this problem, MikeMirzayanov.

Hello, Codeforces!

I and ooaa are excited to invite you to participate in Codeforces Round 922 (Div. 2), which will take place on Jan/30/2024 17:35 (Moscow time).

This round will be rated for participants, whose rating is below 2100. Participants with higher rating can participate unofficially.

You will be given 7-8 problems and 2 hours to solve them. We recommend you to read all the problems. 1 or more interactive problems may occur in the round, so we suggest to read this post.

We would like to thank:

• Akulyat for the excellent coordination of our round.
• wuhudsm for finding that the previous C has already occured in one of the rounds.
• A_G, bashkort, orz, Andreasyan, green_gold_dog, zwezdinv, EJIC_B_KEDAX, Kihihihi, makrav, sam571128, Undying, htetgm, wuhudsm, kovir_aleksey_korroy, JustNik77, Chaska, Murinh0, leoper and Ileonov for testing and valuable feedback.
• MikeMirzayanov and geranazavr555 for the excellent Codeforces and Polygon platforms.
• You, for participating in this round.

We wish you good luck and high rating!

UPD. Score distribution: $$$500 - 1000 - 1250 - 2000 - 2500 - 3000 - 3250$$$.

UPD2. Congratulations to the winners!

Div. 2

1. alice_ssoi

2. JaredGoff

3. ppltn

4. sunc_mgu_govno

5. 1926_yes

Div. 1+2

1. arvindf232

2. SSerxhs

3. alice_ssoi

4. natofp

5. JaredGoff

Congratulations to the first solves as well!

• А. EyadBT
• B. __jk__
• C. Golovanov399
• D. thisisnotaclone
• E. WLZ
• F. tute7627
• G. wsyear

UPD3. Editorial.