Please note that the user I am referring to is nihaaleee.

After briefly reviewing his/her submissions, I suspect that this user may be using a "high-tech assistant" (a.k.a. an LLM), which I will explain with a few pieces of evidence that I have collected:

1. All of his/her submissions are commented very carefully and neatly. (For more details, check his/her submission page.)

2. Even though of his/her great performance in the round, he/she still received some "WA on test 1" on some very trivial problems, for instance, Problems A and B (367607999, 367607609, and 367620091). Moreover, after each failed submission, the comments kept getting more and more detailed.

3. After switching from Python to C++ after Problem B, we can see that he/she used "if (cin >> t)" (367643392, 367648870, 367651867) and "if (!(cin >> n)) return;" (367643392), which is a very significant sign of the use of LLMs.

These are all of the signs that raised my suspicion about this user. Thank you for reading.

If I have falsely accused or caused any inconvenience for nihaaleee, I sincerely apologize in advance.

I hope to help Codeforces become a better and fairer place to compete and learn for everyone.