They all use LLM to cheat, and luuia's code is CRAZY. He used stranged variable names and usless defines. This is because he want's to hide that he is cheating.

This is what make it more suspicious:

1. They come from the same school

2. luuia is just a specialist three months ago, but he is now a IM.

3. zhoujiarun0216 only solve AB in ABC in 40 minutes, but he solve 5 problems in div2.

So, plz ban these accouts.