soooo i was scrolling through leaderboard of latest div1 and then stumbled upon this guy. i already knew that F was solvable by LLMs, also when i looked at submission timings they seemed kinda fishy.
wow, this guy uses python? interesting, but we have conqueror_of_tourist so it's not that strange really. wow, this guy rewrote his code entirely just because it got WA1? well shit happens. wow, this guy got TLE64 using python and then in 8 mins rewrote code to C++ using completely different code style and namings? again, strange, but maybe he's bipolar/schizophrenic and types really fast.
then i took a look at his prev round. what the actual fuck is going on? like dude you really can't prompt an llm to not change your entire fucking code in 5 mins?
also i think there's a lot of cheaters on top of this round's leaderboard but this individual is the most ridiculous and not banned yet
also Codeforces probably needs to implement some additional heuristics to automatically ban (or at least flag?) large submission changes in small amounts of time (although we don't want to punish cases where guy added some huge template or deleted useless code), it will eradicate a lot of lazy cheaters
Any heuristic like this is probably too hard to systematically implement in a useful way. And anyway, do you really want to help the cheaters know to avoid another tell-tale sign like this :p
But yes please ban this guy. He is even marked in this DB: https://cf-cheater-database.vercel.app/. So there is clearly even more evidence.
like they even care about it lol, as you can see even "top" cheaters don't care about basic conspiracy
also i'm sure this 69 guy will just create another account, so this report will not harm him significantly (except maybe he'll lose time he spent prompting and some money he spent on llm tokens in case he doesn't have subscription)
Sept This guy is suspicious, too.
In Codeforces Round 1069 (Div. 1), he used tabs for indentation in 352197657, spaces in 352209067, and a mixture of tabs and spaces in 352202613 and 352226586.
Further more, the same thing also happened in the two most recent contests he participated in (2157 and 2173).
gua069 bjcb clearly cheaters.
bjcb is indeed really sus (used two different templates in one round, spams submissions with notable diffs, used tabs randomly in the middle of submission instead of spaces etc.), can't say that about first guy tho, he seems more consistent in code style and i haven't found large diffs in his submissions
bjcb is a known cheater in Russia. There is a lot of evidence for that: for instance, he wrote all russian NOIs on a newbie-pupil level and has never won even the easiest ones.
yeah i was going to search for his name on roi.algocode.ru (he's not there, what a pity for gm!) but you just confirmed it faster
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gua069 is an alt of well-known cheater arnabmanna . but he's already banned so that doesn't really matter anymore
more cheaters: _ironman_3000, devilshubhra, feniwcktree (check last contest submissions).