MikeMirzayanov

My friend chennie got banned today for unknown reason. He did nothing else but just took part in ICPC 2026 Online Challenge 1 powered by Huawei and we cannot find out the reason why he was banned.

Here's his clarification:

I have never used AI tools, cheated, or received any external assistance in any official contest, nor have I ever violated community guidelines or posted any inappropriate comments.

Clarification on chennie_fan and chennie_negtive:

I noticed there are two accounts with similar handles on the platform: chennie_fan and chennie_negtive. I would like to clarify that neither of these accounts belongs to me.

They were created by my classmates as an inside joke.

Code Style: If you compare the submission code across these accounts, you will find significant differences in macro usage, variable naming conventions, algorithm templates, and overall coding habits.

IP Addresses: If the system or administrators verify the login and submission IP logs, it will be clear that these accounts operate from completely different network environments and devices.

The ban cost me over 6,000 RMB in prize money. However, what matters even more to me is this Codeforces account, which I have used since I first started learning competitive programming. It holds the history of my growth and so many precious memories.

Can anyone unban him? Or at least tell us the reason why he was banned.

Dear MikeMirzayanov,

I recently found that there were too many users with black name submitting too many submissions, which get WA or TLE on 1. Through their behaviour and code style, I bet they are AI. They took up pages of the status list and made it hard for me to overview, find or read others' submissions. Anyway, they are annoying.

Could you please solve it. I suggest adding an option to hide the submissions from black named users in the Status Filter part.

Hi! Dear MikeMirzayanov, KAN, Proof_by_QED and other admins,

sorry for disturbing you. I send this message to appeal for the skipping of my submission Submission #343358835 — Codeforces I was surprised to see Submission #343337184 — Codeforces so similar to mine, but I would provide any evidence to prove my finishing the code independently.

1. I used vs code with CPH Editor during the contest, so I have timeline of the code. I did bad and solved A at 23:09 UTC+8, after that, I started to work on B. I finished my first version of code at 23:34 UTC+8.

https://cubber.lanzoub.com/iGw5t38e4hyb

As you can see, I spent 2 mins making debugging output and finally found it was the input. If I was cheating, why I have made these silly mistakes?

1. I'm a Chinese. Known from the profile, @kondasujay2 is an American. Platforms like youtube, tiktok are banned from China. It is impossible for me to get his code.

2. The idea is easy to work out. Since nm<=2e5, a O(min(nm)nm) was obvious. Just iterate the upper and lower bound of the rectangle and then focus on the horizontal line. Using segment tree or something else would add a log to it, so I was directing to a more concise solution. It's a good choice to do a prefix minimum.

3. Vector coding is really great. I learnt it recently and was applying them to my code.

4. My competing were basicly on Atcoder before. I've started to compete on Codeforces for only months. From my performance and former code, please believe that I have the ability to keep Master. I don't need to cheat.

Above are some of my proof. You can ask more. I'm willing to coorperate.

Also, I hope for some more dependable anti-cheating rules and more accurate skipping and banning. I, with all Codeforces lovers, hope for a better environment.