Kmes's blog

By Kmes, history, 20 months ago, In English

So today I recieved this message from a used named "System" System, here is its contents. This message was sent to me in russian, even though my CF is on english mode rn. It says that my submission 201305954 is identical to the submission 201337105 of a user TeeJay_0 (which i have 0 connections to he lives in the Netherlands and I live in Russia) for the problem 1797C - Li Hua и шахматы. His solution was skipped and I only got this warning. The solutions were pretty identical, and the names of the variables were the same. Although it has to be admitted that these solutions could have been easily been the same on their own — the idea that both of us have in our solution and the structure of the code are pretty much the only ones possible in the problem. Calling the variables a, b, c, x and y feels pretty natural in this problem.

Can someone please help me and tell me am I actually accused of cheating or was this a troll message? Did anyone else also recieve this kind of accusations? Am I banned from participating in codeforces? Edit: the content of the warning: Внимание!

Ваше решение 201305954 по задаче 1797C значительным образом совпадает с решениями других участников и находится в группе одинаковых решений Kmes/201305954, TeeJay_0/201337105. Такое совпадение является явным нарушением правил. Отметим, что непреднамеренное утечка тоже является нарушением. Например, не следует пользоваться ideone.com с настройками по умолчанию (публичным доступом к вашему коду). Если вы имеете неоспоримые доказательства, что совпадение произошло по причине использования общего источника, опубликованного до соревнования, то напишите комментарий к посту о раунде со всеми деталями. Подробнее можно прочитать по ссылке http://codeforces.net/blog/entry/8790. Такое нарушение правил может являться основанием для блокировки вашего аккаунта или других штрафных санкций. В случае повторения нарушений, ваш аккаунт может быть заблокирован.

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20 months ago, # |
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Auto comment: topic has been updated by Kmes (previous revision, new revision, compare).

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20 months ago, # |
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Yes, messages from the unrated user "System" (this exact Unicode string) aren't fake.

I'm guessing it's a false positive in plagiarism checker since the solutions are so simple that the amount of work to turn one into the other is about the same a cheater would need to copy a solution and make basic changes to hide it from trivial plagiarism checkers (change variable names/scope, macros, header/footer, inline functions etc). I expect this to be the case with easy GPT-solvable problems and with pure thinking problems. All you need to do is appeal if you get your solutions skipped; hopefully the plagiarism checker gets tuned if it happens too often.