Yo So apparently I found out this marshadow_ninja guy and he gain my suspicion through his code.

Problem A: "Okey normal dude coding yeah yeah"

https://mirror.codeforces.com/contest/2118/submission/324059526

Problem B: Instant change of coding style, using T instead of tt as his previous A submission, variable name starts to get longer. Also this style is very VERY similar to ChatGPT

https://mirror.codeforces.com/contest/2118/submission/324084308

Problem C: "onesAbove" array, interesting name tbh. Also the logic and style is the similar to ChatGPT

https://mirror.codeforces.com/contest/2118/submission/324094098

Problem D1: He did this BEFORE C, how good is he? Same style as ChatGPT, as usual

https://mirror.codeforces.com/contest/2118/submission/324091690

(using THIS

auto state_id = [&](int i, int dir, int r){return (i*2 + dir) * k + r;};

is what ChatGPT would do, yes i know there ARE people use this, but ChatGPT usually use this too, I'm just bringing up the issue.)

Problem E: Hmmm looks much more legit than the others, but his sorting method is just strange, usually people will create a bool function. Anyway still look ChatGPT.

https://mirror.codeforces.com/contest/2118/submission/324103638

Can't forget to tell you about his massive leap in rating. Bro just INSTANTLY jump to specialist after 4 contest. Almost every problem look sus and not hand-written, As you can see in his submissions (He only submit for contest only so its easy to tell)

https://mirror.codeforces.com/submissions/marshadow_ninja

Just look at it and tell me your opinion

EDIT: His submissions have a lot of strange and long and "meaningful" variable name.

EDIT 2:

Here's my friend Defylogicguy's opinion about this

Look, he solved D1 in 44 minutes, C in 47 minutes. How can a person solved 2 problems in 3 minutes. Plus naming long variables takes a long time. And omg, constructing a struct for each testcases, nobodies that dumb. Plus in E, he's using: using pii = pair<int, int> while he doesn't use and it's not even a snippet. For those who don't know, it's the first time I have seen a function named llabs(), I have been into CP for a year now and haven't seen llabs() before. He even use different snippet for each code