MikeMirzayanov's blog

By MikeMirzayanov, 9 years ago, translation, In English

With the help of some experienced and respected members of the community (thanks!) there was formulated a rule that allows a third party code to be used under certain conditions. Please read carefully the text.

The following text will go as part of a renewed competition rules. The closest contest will be held already on the updated rules. Thus, there are about two days for further details, if something is unclear.

Solutions and test generators can only use source code completely written by you, with the following two exceptions:

  1. the code was written and published/distributed before the start of the round,
  2. the code is generated using tools that were written and published/distributed before the start of the round.

Any usage of third-party code should not violate the right holder’s license or copyright. Remember that published code is not always free to use! At the request of the right holder, any code that violates the license or copyright may be considered as violating the rules.

All the changes in the code from exceptions 1) and/or 2) must be made solely by you.

If there are any doubts about the time of publication, possible collaboration etc., a participant will have to prove his/her complete innocence by presenting compelling and satisfactory evidence.

Currently, the only reliable proof is the presence of code on the Internet and the presence of the used edition in the cache of well-known search engines.

For example, this rule accepts the use of the code from the website http://e-maxx.ru/ if the code was written and published/distributed before the start of the round. With the help of search engine caches, it can be easily shown that such code doesn't violate the rules. Similarly, it is permissible to use the code from a book/article that was published before the contest. On the other hand, using team reference code (for example, prepared for ACM-ICPC World Finals) is not allowed if there is no reliable and objective way to prove that the code was written before the contest.

This rule doesn't loosen the rules about prohibiting of communication, discussion, or any other form of communication between the contestants on any topics about the problems during the round.

 
 
 
 
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9 years ago, # |
Rev. 2   Vote: I like it +49 Vote: I do not like it

Sorry if this is already answered in the text above, I'm not quite sure.

In a number of contest websites (including TopCoder and here on Codeforces), after a contest finishes, the source code for each submission is viewable by any member. Is this considered "published/distributed" code? (e.g. does this rule mean that all contestants can use past submissions of every other contestant?)

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    9 years ago, # ^ |
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    Same question for code snippets published on codeforces.com/blog/

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    9 years ago, # ^ |
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    Generally speaking, no, authors do not have obligation to release their code into public domain, they only provide unexclusive license for TopCoder

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    4 years ago, # ^ |
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    Sorry but it was a coincidence .. I published my code on ideone.com that's why the problem has occured. Please give my ratings back

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      3 years ago, # ^ |
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      __VENOM___ Could you please explain what your issue was?

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        3 years ago, # ^ |
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        I think i have used ideone in public mode by mistake because i dont have idea that someone can see my solution there thats why my solution has been copied by somebody.

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          3 years ago, # ^ |
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          Same here bro , I also used ideone on default setting by mistake, what's the solution?

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            3 years ago, # ^ |
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            I tried running my code on ideone in default setting and someone copied my code and I was not aware about that.

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              18 months ago, # ^ |
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              Same happened with me.

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                18 months ago, # ^ |
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                Same with me,I don't have idea that someone can see my solution on ide during contest, that's why i recieved a msg that your solution is colloide with others. I will take care from next time

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                  18 months ago, # ^ |
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                  Same happened in my case, at that time i didn't know about this disadvantage of ideone .Will take care of it.

                  Time to switch to sublime or vs code.

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                  6 months ago, # ^ |
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                  what is ideone.com?

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                  5 months ago, # ^ |
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                  same bro

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                  5 months ago, # ^ |
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                  I used vs code but still my ratings are rolled down even though I did not cheat. Any idea how to overcome this from next contest?

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              16 months ago, # ^ |
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              that happened to me twice before realizing that I was holding myself down by using Ideone in the first place

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                16 months ago, # ^ |
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                how much rating was deducted for this?

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                  16 months ago, # ^ |
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                  none but they rolled back my rating change and warned me that a third strike might get me panned

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              16 months ago, # ^ |
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              The same happened with me as well I was writing my code using ideone.com in public mode didn't know this would happen. I am sorry for what happened in this contest. Now onwards going to use sublime!

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                15 months ago, # ^ |
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                I think i have used ideone in public mode by mistake because i dont have idea that someone can see my solution there thats why my solution has been copied by somebody.

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                  6 months ago, # ^ |
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                  Same with me,I don't have idea that someone can see my solution on ide during contest, that's why i recieved a msg that your solution is colloide with others. I will take care from next time

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              9 months ago, # ^ |
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              same happened with me

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              5 months ago, # ^ |
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              Same happened with me, please give my ratings back.

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                5 months ago, # ^ |
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                I would highly recommend you take a look at everyone else's requests before posting you're own. IDEONE isn't affiliated with Codeforces. You won't get rating this round, keep that in mind for next round, and keep your ide's as private!

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              2 months ago, # ^ |
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              Same with me, I will take care of it better next time

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              2 months ago, # ^ |
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              same here

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                2 months ago, # ^ |
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                Same here, I will take care of it from next time

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            5 months ago, # ^ |
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            same here and I wasn't aware of this at all, kindly give my ratings back.

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              4 months ago, # ^ |
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              Aur Karo Cheating Aesa hi Hona Chaiye tumhe kya lagta hai harr jagah Choot quota Lag jaega :) :) :)

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                3 months ago, # ^ |
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                bsdk gaali deni mjhe bhi aati hai ghr mein maa behn se bhi aise hi baat krte hai ye madarchod log

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                3 months ago, # ^ |
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                shrm haya naam ki chizz hai apni jubaan smbhaal kr rkho aur jrra tmeez seekh kr aao pehle dusro ke comments mein hgne se accha

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                  2 months ago, # ^ |
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                  kis bat ka saram, chhori karne se pahle tumhe saram aai?agar aai hoti saram to chori nhi ki hoti or yaha rr nhi kar rhi hoti. and choot quota hi hai jo tumlog zomato,lawda lassan...pta nhi kitne company me shortlist ho jate,or rahi bat jubaan sambhalne ki,to choot qouta ko choot qouta hi bolenge,bcoz usi ke basis pe tum sb ka selection hota hai,so accept the fact

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                  2 months ago, # ^ |
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                  oo madam aukat mein reh kr baat krle aayi smjh mein 20 min mein nipta kr aayi thi zomato ka test nhi pta hota na to dusro ke comment section mein jaakr hgte nhi hai

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                  2 months ago, # ^ |
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                  khud tum log kch krte nhi ho aur dusro ko bolna asaan lgta hai tumhe....

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                  2 months ago, # ^ |
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                  20 min me ki thi n, cf pe chori q ki fir? yaha bhi 20 min me kar leti 2 que, kuchh jada nhi ho rha? aukat and all...kya hi kare..behenchod duniya hi uske pichee hai, jab uske basis pe sab kuchh mil hi jata fir aukat ki bat to karegi hi nibbi.

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                  7 weeks ago, # ^ |
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                  All my friends are toxic, all ambitionless So rude and always negative I need new friends, but it's not that quick and easy Oh, I'm drowning, let me breathe

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          9 months ago, # ^ |
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          same here, kindly accept my solution for the first time this happened and I will make sure that from next time it wont happen

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      3 years ago, # ^ |
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      The same thing also happened with me.They did not even change the author name!!

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      15 months ago, # ^ |
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      I have two acout,and this time I use the first acount to take part in the contest,but My cf tool is linked to the other acount, so i submitted the same code. What can I do now.

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        5 months ago, # ^ |
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        Realize that your lie is so terrible that you should take acting lessons

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    2 years ago, # ^ |
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    As for rechecking, I am not clear. I have not referenced the code on any platform, nor have I submitted the code on any platform except CodeForces. Please restore my score.

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    15 months ago, # ^ |
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    someone cheated my code and he is skipped but I lost 200 scores, why ?????????????????? please give my scores back

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    12 months ago, # ^ |
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    The codeforces id's named with hackeroder and Prince_001194 are both belongs to me. So that's why same submission occurs on both the id's.

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    10 months ago, # ^ |
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    This is the first time it had happened to me , i do not even knew about these kind of issues. I did my coding part in ideone.com and i don't know how it got copied , i promise this is the last time , it will not happen again. This was my last mistake like this and i assure Codeforces that this will not happen again.

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    7 months ago, # ^ |
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    it's so pity that this happened.I think it's a very coincidental thing, because this idea was brought up by my senior and me in class before. Please give my ratings back

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    2 months ago, # ^ |
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    questions with similar logic are available on websites like geeks for geeks etc which is open source and have access to everyone before the contest begins check out https://www.geeksforgeeks.org/print-array-after-it-is-right-rotated-k-times/

    the code was written way before the contest was even started hence not violating any rules

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6 years ago, # |
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Currently, the only reliable proof is the presence of code on the Internet and the presence of the used edition in the cache of well-known search engines.

Do I understand it right? Presence in cache of well-known search engines is mandatory for a proof to be considered reliable, isn't it?

What about the Wayback Machine (archive.org)?
Is it reliable enough?

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    5 years ago, # ^ |
    Rev. 2   Vote: I like it -31 Vote: I do not like it

    It is not polite
    (and does not serve well to the community)
    to downvote a comment without any useful reply.

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      5 years ago, # ^ |
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      As we can see, anonymity of the voting system encourages coward and irresponsible behaviour of the voters.

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        5 years ago, # ^ |
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        What exactly is cowardly about downvoting you?

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          5 years ago, # ^ |
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          Downvoting with explanation is supportive and responsible
          (but yes, it is risky because your explanation comment can be downvoted itself).

          Downvoting with no useful explanation is just harming another person's contribution score without taking any responsibility or risks for that.

          That's why I call the latter behaviour coward and irresponsible.

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            5 years ago, # ^ |
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            Okay so this is just arguing for the sake of it, but...

            1. Contribution score doesn't matter.
            2. "Coward" means one is afraid to take a risk. While indeed downvoting doesn't take any risks, people don't downvote comments because they are afraid of taking risks. People downvote comments because they are wrong, offensive or just plain garbage.
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              5 years ago, # ^ |
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              Then why not to explain the reason of downvoting in a couple of words?

              Otherwise, how an author (of a downvoted message) is expected to learn what exactly is "wrong, offensive or [inappropriate]" about his/her comments and why it is considered wrong?

              (I think the practice of explained downvotes would significantly decrease the total number of "wrong, offensive or just plain garbage" comments because their authors had a chance to learn community rules faster: what is considered bad in this specific community, and why.)

              I understand that there are obvious cases (such as offensive comments) where explanation is not needed. But in this specific case it was not obvious (and it is still not obvious). Not for me, at least.

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              4 years ago, # ^ |
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              It's often the case that some very genuine comments get downvoted suprisingly. Even some contest announcements get so many downvotes. Do you think those announcements are wrong, offensive or just plain garbage?

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            5 years ago, # ^ |
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            Stackoverflow tried to solve this problem by removing 1 point from your reputation when you downvote something.

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          5 years ago, # ^ |
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          (A bit more detailed answer. Back to the original issue.)

          A bad thing -- as I see it -- is that I was left alone with my downvoted comment and without important information.

          Specifically, I still have no idea why the original comment was downvoted.

          I do not have information, neither about what exactly was bad about that my comment, nor about who downvoted it (so that I could ask them personally).

          How should I learn from my mistakes in such situation if I do not understand what exactly my mistake was?

          In my opinion, sharing information which allows other members to learn is a crucial thing for a community.

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            4 years ago, # ^ |
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            I was also very confused by your comment downvotes, i undestand the way you fell, and really appreciatte the fact that you are not giving up and blaiming youself. People downvote maybe just to feel better and harm others, idk.I see many guys explaining their solution to problems that are not in editorial and require some advanced knowldge getting downvoted. That's the way things are, nothing to do about that. MAYBE I WILL GET DOWNVOTED TOO,tring to keep your side.

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      4 years ago, # ^ |
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      Hahahaaa XD

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5 years ago, # |
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Solution to problem Codeforces round 447 Div.2 question A. QAQ was already available on the internet, well before the contest.Please visit source — http://www.geeksforgeeks.org/find-number-times-string-occurs-given-string/ to confirm. Hence I don't think people should be penalised if their code matches with someone...as they both referred the same source....codeforces please see into it !

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5 years ago, # |
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delete2, coutinho, OutSpace, blindspot — this is 4 photo machines. You will can’t better, lol

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Hello Everyone, This morning I got a message from system that my submission http://codeforces.com/contest/911/submission/33725640 during the Educational Codeforces Round 35, has been found significantly similar to http://codeforces.com/contest/911/submission/33725051 and my account my get blocked due to this.

Both of the submissions were made my me for Question C, and i was thinking that the earlier one would be ignored as we have in any normal Round.

I request the community to help me out here as I don't know whom should I contact about this.

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:(

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    5 years ago, # ^ |
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    I also made such stupid mistake. Sure, it is so awkward.

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zhongyin is my other account.I wasn't aware of the rules. So I submitted same code in both accounts in Codeforces Round #459 (Div. 2) contest. I am really sorry for my actions.

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zhongyin is my other account.I wasn't aware of the rules. So I submitted same code in both accounts in Codeforces Round #459 (Div. 2) contest. I am really sorry for my actions.

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Please clarify the message that is sent to users. I don't know where to "write a comment to post about the round with all the details". If this is the right place, please re-evaluate my solution for contest 919. The system claims neutron-byte/34741180 is similar to czommerfelds/34745389. The solution is very simple so it is no surprise it would be similar. Also the first result on Google for "c++ sum of digits" yields the same function http://www.sanfoundry.com/cpp-program-display-sum-of-digits/. Thank you. Best, Christian

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hello codeforces, i had a message after Educational Codeforces Round 37(Rated for Div. 2) .which says that Your solution 34846770 for the problem 920A significantly coincides with solutions oneplus3/34846646, codinghunter/34846770 .i want to say that both of the accounts(oneplus3 and codinghunter) were mine and i don't know the rules of submissions . But i promise that the soutions of both accounts is completely mine, and i won't make this mistake again.Don't block my accounts

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"Attention!

Your solution 35396581 for the problem 939A significantly coincides with solutions Mushfikur_Rahman/35392093, RezaSi/35396581. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties."

i dont know him and not published my code any where :/ ... that's simple problem and may be many user have same solution for A problem in contest :/

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5 years ago, # |
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I received a message from CodeForces after round# 464 that my solutions for A,B and D have been plagiarised. The solution to D was DSU and code was available on HackerEarth link for D's code. Problems A and B were trivial, I think because of similar template the solutions have been caught. The template which I use is really common. The codes for A and B were of <10 lines and hence the similarity. Kindly look into the matter.The variable names which I use are really common amongst the programmers hence the similarity.

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Hi Mr.Mike! I'm Amir and today i passed the contest with my submissions but your system and your employees i don't know, said that i submit a copy code for my self. i have a question: If i have two different accounts and i want to participate in both of them, i can't do this?!?!

I'll thank you if answer my questions, rapidly! Thanks again!

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    5 years ago, # ^ |
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    Having more than one account is prohibited by the rules AFAIK.

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i just wanna to ask if 2 accounts belong to 1 person and he did the contest with 2 accounts at the same time. Is it violation?

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5 years ago, # |
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I dont know the rules of CF.And the other account is mine too.I submit my code on my account and i submit it with this account. Whatever,i am sorry for this thing happened.

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5 years ago, # |
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Attention!

Your solution 36167133 for the problem 948A significantly coincides with solutions avyaktg98/36161438, kogorou/36167133. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties.

This is a brute force solution and there was a similar problem "Palindromic Supersequence". Also if the members of the same team gets the same solution I recommend giving time to the involved participants to make changes in their code as the solutions are constructed while sitting in the same room. This type of instance is highly regretted and will be careful for the next time.

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    5 years ago, # ^ |
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    The solutions are not similar, they are completely the same. No one can believe in such coincidences.

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      5 years ago, # ^ |
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      Nice memes

      36178861 36178839

      same code + same compiler

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        5 years ago, # ^ |
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        That's because of Undefined Behaviour. You should erase by iterator, not by value (because in multiset you will delete all such values and iterator iter can become invalid)

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5 years ago, # |
  Vote: I like it +19 Vote: I do not like it

Attention!

Your solution 37167311 for the problem 962E significantly coincides with solutions cuom0405/37165015, flibia/37167311, anno/37167796, pepi_angelov/37167900. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties.

I used the official solution written in the Goodbye 2017 Editorial: https://www.dropbox.com/sh/i9cxj44tvv5pqvn/AAB1_2Q0XKvKiOA1ukvcNIuUa/F?dl=0&preview=F.cpp

Solutions and test generators can only use source code completely written by you, with the following two exceptions:

the code was written and published/distributed before the start of the round, the code is generated using tools that were written and published/distributed before the start of the round.

I used a code that was written and published / distributed before the start of the round.

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5 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry, for being irresponsible. Yesterday in the "Educational Codeforces Round 42 (Rated for Div. 2)" I unintentionally used ideone as my system compiler wasn't working fine.I forgot to change the visiblity settings of ideone and someone intentionally misused my code. I would take care in future to not repeat this. my ideone code link during the contest is https://ideone.com/8vObjQ I saw the users profile with whom my code coincided(as said by you) ,his every solutions had been skipped which means he has a habit of copying. So i am innocent.

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5 years ago, # |
  Vote: I like it +8 Vote: I do not like it

Attention! Your solution 37167900 for the problem 962E significantly coincides with solutions cuom0405/37165015, flibia/37167311, anno/37167796, pepi_angelov/37167900. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found athttp://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties.

This is the problem I used as my source (and probably the others): http://codeforces.com/contest/908/problem/F 962E is just the same problem as 908F.

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5 years ago, # |
  Vote: I like it +13 Vote: I do not like it

FOR EDUCATIONAL ROUND: 42 ( The latest one)

I received a mail about violating the rules of the contest, by copying the code. But I have conclusive evidence that I had taken the code from a AC code of another problem, 908F. If u want I can link the solution here, from which I took the code. However, it was present BEFORE this contest began. So I am not sure how this can be a violation of the rules. It's the setters fault that the problem was exactly the same.

My solution : http://codeforces.com/contest/962/submission/37168611 The code I took it from: http://codeforces.com/contest/908/submission/33800403

I too had a AC code to this problem:908F (http://codeforces.com/contest/908/submission/33824171) But that got some error, so I decided to take another code.

Please nullify the claim that I collaborated with someone else during the contest. It is pure coincidence that they took the same code.

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5 years ago, # |
Rev. 2   Vote: I like it -19 Vote: I do not like it

great rules ...

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5 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry, I don't know the code can't be discussed, this is the result I discussed with him.

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5 years ago, # |
  Vote: I like it -13 Vote: I do not like it

My solution 38295464 for the problem 984D significantly coincides with solutions yqdjl4/38292975, xiaowuga/38295464. I think the idea of this problem is relatively simple, the code is short, the possibility of the code similar is very great, I see the idea of the code is almost the same, this question is I think independently, I hope to restore my ranking,

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    5 years ago, # ^ |
      Vote: I like it -13 Vote: I do not like it

    This question is not difficult, It doesn't need any algorithm. This problem needs to be preprocessed.I do not have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition.But I stayed up all night playing this game and seriously ponder every question. I don't want to be skipped this contest.please!!!!!

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5 years ago, # |
  Vote: I like it 0 Vote: I do not like it

hello.. I just got the message.. Attention!

Your solution 38659699 for the problem 981A significantly coincides with solutions i_wanna_work_at_google/38659167, tushar_2658/38659699. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties.

I dont know this guy.. maybe the solutions coincided.. requesting for a recheck.. and I didnt get any solutions from any source or other stuffs

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    5 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Note that unintentional leakage is also a violation.

    Solutions are the same. By default some online IDE (like Ideone.com) publish codes. BTW I find it extremely weird or even dangerous. Be careful with them. Also prefer to use HTTPS in future and change passwords. Good luck.

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4 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Attention!

Your solution 39380288 for the problem 992C significantly coincides with solutions stonejjun03/39379338, ahgus89/39380230, stonejjun/39380288. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties.

I made this code before starting the contest https://www.acmicpc.net/source/8705303 and lots of people could see and also I shared with lots of friends already. When I write code in upper site. So I think the the part that in the site of code is same... So could you help me about it????

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention!

Your solution 39628420 for the problem 996D significantly coincides with solutions sharpowl_06/39627670, sureshupadhyay900/39628420. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties.

i always prefer ideone for code ... and this is my code https://ideone.com/n0UjCL community please look at this and help me

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry I unintentionally used ideone.com for writing code and someone must have used it to see my solution. This won't happen later.

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4 years ago, # |
  Vote: I like it -13 Vote: I do not like it

Hello, I recieved the following email from codeforces: Attention!

Your solution 40443772 for the problem 1006D significantly coincides with solutions vbbvaddd79506/40443608, Bogey24/40443772. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties.

Sorry for being irresponsible. In 'Codeforces Round #498 (Div. 3)', I used Ideone Online Compiler and forgot to change the default settings to private access. My ideone link during the contest is — https://ideone.com/BcjYgN. My code was used by someone else intentionally. I also saw the user's profile and observed that his submissions in past few contests have also been skipped. Maybe he had copied other user's solutions as well. Also I submitted my solution for the problem 1006D before this person. I am innocent and would take care in future not to use ideone during live contest.

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    4 years ago, # ^ |
      Vote: I like it +14 Vote: I do not like it

    As you pasted, "unintentional leakage is also a violation", so you aren't innocent according to the rules. Pay more attention next time and move on.

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4 years ago, # |
  Vote: I like it -6 Vote: I do not like it

if me and my friend participated at the same time together consulting and solvong the problem together and due to that our code matches and this is our first time participating any contest so we didn't actually know the rules well. what can we do now?

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4 years ago, # |
Rev. 4   Vote: I like it +5 Vote: I do not like it

Hi Codeforces, yesterday i participated on Codeforces Round #503 and I managed to solve 3 problems.

Unfortunately this morning when I woke up to check the results, i received a message from the system saying that this two submission 41488655 and 41489033 are the same.

I cannot deny that they look exactly alike. But when i did the third problem my IDE (CodeBlocks crushed) and i was forced to use ideone.com (link to ideone code, made 15 hours ago) to compile my code, and probably the other guy took it from there because I don't have any idea how else could he got my code. I didn't know that others can view your solution when using ideone. :( I will never use ideone again during a contest.

Now i don't have any idea how to prove myself as being the author of the problem. But i will try at least, maybe i can still keep my codeforces account. You can see for sure that the other guy copy pasted the problem. The first two problems do not match mine at all. And when you look at his submissions you can see a lot of them for problem C and the difference between last two 41488455 and 41488655 is just one minute and I don't see any way he could come with a totally different solution in just one minute. The submission are completely different.

And if i was using two accounts, do you think I would have wasted time coding two different solutions for the first two problems? Also you can see that the other guy, does this not for the first time, at the last Educational round he did the same. (image proving this).

I hope this can prove my point, have a nice day and thank you for reading, at least I shared my anger with you.

[Edit] Now it seems that i don't have access to any submissions. :(

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    4 years ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    As it is written in the message: unintentional leakage is also a violation. Please, be careful in the future.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Hi, Yesteday in the contest "Educational Codeforces Round 49 (Rated for Div. 2)" I maneged to solve 3 questions out of 7 among which 1 was hacked. But suddenly today i got a message from your team that one of my solution match with some other user. Actually yesterday i used ideone with the privacy public by mistake. I think my solution might be leaked due to that problem. Sir/Madam, I am wrongly penalized as that was done unintentionally but i make you sure that mistake will not be done next time. Kindly look into this matter and remove my penalization for the same contest.

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    4 years ago, # ^ |
      Vote: I like it +10 Vote: I do not like it

    As it is written in the message: unintentional leakage is also a violation. Please, be careful in the future.

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4 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Hi today I have got this massage "Your solution 41863084 for the problem 1025B significantly coincides with solutions stormraider/41847161, travelers/41863084." We both have used same code from geeksforgeeks here. But I think it is not a problem but if it is I will be careful in future thank you. Also can you pls look into the situation and remove my penalty for the same contest thank you.

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4 years ago, # |
Rev. 5   Vote: I like it 0 Vote: I do not like it

Your solution 41835543 for the problem 1025A significantly coincides with solutions ak07/41833884, sourav54/41835543. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. I have not used ideone. I have taken some kind of help from some random sit e through Google search. I have no idea about this consequences. Plaese help. Thank you. Kindly look into this matter.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I got the message "Your solution 41863523 for the problem 1025F significantly coincides with solutions fateice/41858912, WAAutoMaton/41863523, zhang9302002/41864602, BLeavesCoder/41864866."
We used the same public code .It was published on 6/29/2016 and google cached the page no later than 8/7/2018. So I thought that it's allowed by "the code was written and published/distributed before the start of the round".
Please help me,thanks.

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4 years ago, # |
Rev. 2   Vote: I like it -45 Vote: I do not like it

I have resieved the message that "Your solution 41864920 for the problem 1025F significantly coincides with solutions xzm2001/41862009, cubercsl/41864920." The problem is almost same to BZOJ4246 and we may use the same public solution and code. Please help me,thanks.Cache

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

"Your solution 42051437 for the problem 1029A significantly coincides with solutions DPO_WS/42050146, minhkhoi1026/42051437. Such a coincidence is a clear rules violation." I and my friend participated at the same time together and solving the problem together and due to that our code matches and we didn't actually know the rules well. I and my friend (http://codeforces.com/profile/DPO_WS) are very sorry about this, we won't do that anymore. Hope you can forgive us. Sorry if my English is bad.

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4 years ago, # |
Rev. 3   Vote: I like it -13 Vote: I do not like it

"Your solution 42030924 for the problem 1029B significantly coincides with solutions AzusaMiooo/42030143, Isshiki_yen/42030924. Such a coincidence is a clear rules violation." I and my friend AzusaMiooo solving the problem together and due to that our code matches and we didn't know the rules well. I am very sorry about this. Hope you can forgive me.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I found the problem in the compilation environment three minutes before the competition, so I used ideone. I was not used to ideone, compiled without turning off the searchable option, and was excluded this round. I am aware of my mistake. Sorry.  This may be insufficient evidence, but since most of my code so far has been written on the same template, I can show that the header, type definition, and variable declaration are exactly the same.

My source code of last round http://codeforces.com/contest/1025/submission/41833456 http://codeforces.com/contest/1023/submission/41750569

Copied source code http://codeforces.com/contest/1028/submission/42159376 http://codeforces.com/contest/1028/submission/42159445 http://codeforces.com/contest/1028/submission/42179991 http://codeforces.com/contest/1028/submission/42163628

I will pay great attention to the use of ideone in the future. May I ask you for a favor in this round?

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4 years ago, # |
Rev. 10   Vote: I like it 0 Vote: I do not like it

y creI created a different Id for myself to use .I am sorry that I used both IDs during contest .I didnt cheat nor copied code of someone else.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Hi,

This is regarding Round 511 Div 2. My submission, abhisheksince97/43197368 has been flagged for coinciding with solutions vbbvaddd79506/43196786, priyasen54/43197486, fibo1/43201480, gennadykorotkevichaz/43202067, cpp19/43202087, milanmas/43202887.

I can prove that the solution is mine and the others have copied it. You can open all my recent past submissions, I have used the same template for .cpp file as I have done in this one. The rest have clearly copied.

Also, the solution that I have written is available on geeksforgeeks (https://www.geeksforgeeks.org/largest-subsequence-gcd-greater-1/). This could also be the reason for the match.

I was really foolish and naive to have tested my code on ideone. Please verify that I am the true author of this solution and please let this contest be rated for me as I put a lot of effort into it. I have never done such a mistake before and wont do it ever again.

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4 years ago, # |
  Vote: I like it -8 Vote: I do not like it

Hi, This is regarding solution 43335491 for the problem 1058D - Вася и треугольник , I have solved this question on my own ......I also matched my solution with 43330317 yes we have same variables declared due to which this misunderstanding took place ....but as you can see there is a lot difference in my templates and him....which I always use. This is just a coincindence and I am Innocent. Kindly consider my submission and do not block my account Thank you.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Yesterday, the two IDs, huangzhengdoc and hz2016 were my IDs, because CodeForces could not be found in some places in China, so I chose a domestic agent, but when I submitted last night, my two accounts have been switching because The proxy IP is the same, I can't choose, so both accounts are submitted, but after the game, I sent an email to the contest author's email address mirzayanovmr@gmail.com, asking him to help me solve this problem and delete one of them. The account game, but until I have not responded, but I can only do this to solve this problem.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry but my code is different with code of 18tin_nntan/45607672!!! I think my making is some same with this code may be because I and he have the same think!! Because this test is so short and the making is so easy to see!! So i thnks that is the reason why my code is same wiht 18tin_nntan/45607672. It is belong to maths!! And i use maths formula to resolve it!! I don't know him. I wish admin will review my code. Thanks you very much!!!

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4 years ago, # |
  Vote: I like it -13 Vote: I do not like it

I didn't cheat.but I got out of the contest. It's unfair.

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4 years ago, # |
Rev. 3   Vote: I like it -28 Vote: I do not like it

I got a message from system that my submission 46154222 during the Codeforces Round #524, has been found significantly similar to 46154175 and my submission get skipped.

Both of the submissions were made by me for Question C, and I have submit it to both my account.

I request the community to help me out here as I don't know whom should I contact about this.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Is it fine to take a piece of code from stack overflow or Github (e.g a sorting algorithm) ?

I'm new to this (obviously) : )

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4 years ago, # |
Rev. 2   Vote: I like it -33 Vote: I do not like it

.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

i was using ideone in the public mode during the contest while solving B problem of Hello 2019 and i have not copied the solution and the only evidence about coincident clashing of solutions is that i was using public mode of ideone.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry! I got the code from my friend.

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4 years ago, # |
Rev. 3   Vote: I like it -13 Vote: I do not like it

First , I need to say sorry to codeforces . That submission'id is my another id.The two id both are mine,so we submit the same submission.That time I don't mean that was violation,I just think it's to do experimence. I ware of the importance of it,please give me a chance,I won't do that again.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry but it was a coincidence .. I published my code on ideone.com that's why the problem has occured

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4 years ago, # |
  Vote: I like it -11 Vote: I do not like it

Sorry but it was a coincidence ..... I published my code on ideone.com that's why the problem has occured. Please give my ratings back

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4 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

sorry,i used to do the similar problem on luogu.org.The other one is my classate,maybe we have many things in common,but i am sure we didn't communicate during the contest.

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    4 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    we usually learn on the same text book,it is obviously that we would have something in common,but we never cheat during the contest.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry for the problem that occurred. I was unaware of the fact that ideone.com has settings like Public or private. Sorry if I degraded the tempo of the contest plz forgive me this time, I 'll ensure that same never happens in the future.This is the first tym I came across such a problem. I truly ensure u that in upcoming future it wont happen. Sorry

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4 years ago, # |
Rev. 3   Vote: I like it 0 Vote: I do not like it

.

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4 years ago, # |
  Vote: I like it +8 Vote: I do not like it

Hello, I received a message saying that my solution for Div2D of round #546 coincides with the code of other users. The code is clearly different and for a problem with such a short solution it is likely for the code to be similar. Please look into this.

Here is my submission which got flagged: https://codeforces.com/contest/1136/submission/51189268

Here are the other ones which were compared: https://codeforces.com/contest/1136/submission/51184411 https://codeforces.com/contest/1136/submission/51186289

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4 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

...

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

give back my ratings i din't copied i ran my code in ideone.com that was my mistake and also you can the see the way i wrote the code is completely different than the others.you can view my past submissions you will find it. the way of writing code is different i also wrote my initals firefox at top of each code my initialisation for every code is the same refer my previous submission

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry.We shared our ideas in the contest.I promise i will not do it again.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry, I don't know what is going on. Why is the code I write myself the same as others?

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4 years ago, # |
Rev. 7   Vote: I like it 0 Vote: I do not like it

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

hello codeforces, i had a message after Codeforces Round #552 (Div. 3) .which says that Your solution 52860738 for the problem 1154C significantly coincides with solutions 2018030402024/52858419, 2018030402055/52860738.i want to say that both of the accounts were mine. i want to try my code on another account and i don't know the rules of submissions . But i promise that i won't make this mistake again.Don't block my accounts.

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4 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

The messsage i received : Attention!

Your solution 53512345 for the problem 1150B significantly coincides with solutions k180231/53512345, Muhammad4hmed/53512578. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

Actually me and Muhammad4hmed was solving problems together and he used my built logic actually we both are new and have no idea about the rules of codeforces. Kindly forgive us this time, we will be careful from next time.

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    4 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Those submissions are character-to-character identical. Doesn't sound like "Actually me and Muhammad4hmed was solving problems together and he used my built logic".

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      4 years ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      bro we were sitting together and we solving in team

      i don't know whether is this allowed or not

      but it was the case.

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4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

hello today I got 2 message from system stated below. Attention!

Your solution 54290305 for the problem 1166A significantly coincides with solutions babuji/54290214, sourabh54singh/54290305, hehe172719/54290376. Attention!

Your solution 54300094 for the problem 1166B significantly coincides with solutions Krotonic/54299987, sourabh54singh/54300094. 

You can match the pattern of all my past submissions with these submissions, they are same.

Both these submissions were too late after my submissions and I was using ideone compiler whose visibility was set to public which I was not aware of . I have screenshots of ideone pages as proof. Please make the contest rated for me . I will not repeat the mistake again.

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3 years ago, # |
Rev. 3   Vote: I like it -23 Vote: I do not like it

Attention!

Your solution 55438593 for the problem 1182A significantly coincides with solutions nashugame/55438593, shadyman123/55445818. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I have got this message from the system of codeforces I would like to clear that shadyman123 is a friend of mine at my college. Thus it was during one of those post competition discussions that I showed him my code and he too began using the same macros. As for the logic of the code I don't think that he could have done it any differently he could have differed his solution with mine in terms of only power function. As an evidence you can check that I have been using those macros previously than him. I hereby request you to please do not punish us with penalties.

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Your solution 55459961 for the problem 1182C significantly coincides with solutions Athena_1111/55457716, Anti-Mirzayanov/55458879, gandhipaaji/55458903, shreyanshgeek_unofficial/55458966, Harsh_jiit/55459119, turtle407/55459150, kaptaan/55459742, firefox/55459961, shivansh100/55460142, Izanagi/55460447.

you can view my other submissions and can found out the macros i use its the same .the way i code is the same.the logic might have coincided doesn't mean that i have cheated. please give back my ratings. And also you can check my other submission you will found out that i am not guilty.


~~~~~ Your code here...

~~~~~

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    3 years ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    How can you be such a liar? You copied my code literally. It's better to apologize rather than begging for something you don't deserve.

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3 years ago, # |
  Vote: I like it -7 Vote: I do not like it

Attention!

Your solution 55457716 for the problem 1182C significantly coincides with solutions Athena_1111/55457716, Anti-Mirzayanov/55458879, gandhipaaji/55458903, shreyanshgeek_unofficial/55458966, Harsh_jiit/55459119, turtle407/55459150, kaptaan/55459742, firefox/55459961, shivansh100/55460142, Izanagi/55460447. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I just got this message. I want to clarify that I was using the online compiler ideone.com without knowing that apparently my code was public. I have not copied the code of anyone!! You can check the timing. I have written every line of this code. I haven’t even used functions form any websites. It really pains to receive this message in the first contest where I do well. What a luck!!!!!!! :/

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    3 years ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Plus you can check the format of this solution with my other solutions. It’s the same.

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3 years ago, # |
  Vote: I like it -28 Vote: I do not like it

Good evening.

I joined the last Codeforces Round(#566,div2) , but it turned out that "my solution 55459352 for the problem 1182E significantly coincides with solutions AH_ljq/55459352, wh_ZH/55461495".

wh_ZH is one of my classmates, you can see that we are in the same organization "ASDFZ". Before the Round finshed, I shared my methed with him. He got it, and finally he solved the problem as well.

I promise that I thought and solved this problem on my own. One reason is that my solution is ealier than his.

My submissions were skipped, and my rating drops a lot. Wish you can change the judgement of this round to me.

Best wishes.

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    3 years ago, # ^ |
      Vote: I like it -7 Vote: I do not like it

    I'm sorry for my fault at that round, and I won't do like that any more. Tanks for giving me a chance to correct it.

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3 years ago, # |
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ideone shouldn't be used during participating in contests as your solutions may be shared with other participants so you may use ideone in private mode(not secret) or the best solution is to use an offline IDE(eg:- DevC++,CodeBlocks) or Codeforces IDE in custom innovation tab or use Geeks for geeks IDE

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3 years ago, # |
  Vote: I like it -9 Vote: I do not like it

Attention!

Your solution 55893152 for the problem 1180B significantly coincides with solutions Yaman211/55892304, KMPK/55893152. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

my submit isn't like yaman211 submit and i am who write this code and there are alot of similar code of my code and his code plus you can check the format of this solution with my other solutions. It’s the same.
i hope return my rate back..

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    3 years ago, # ^ |
      Vote: I like it -9 Vote: I do not like it

    And why you are remove my solution and leave me in the contest thats hurt my rate alot At least return the previous rate for me

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    3 years ago, # ^ |
      Vote: I like it -9 Vote: I do not like it

    I managed to reach this rate after 2 months of training Please help me

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3 years ago, # |
  Vote: I like it -9 Vote: I do not like it

In the last div 2 contest, i had another browser opened and logged in condeforces with my another CF account which i rarely use to practice. At first I accidentally submitted a sloution from that account and then again submitted it from my original account. I have proof that both of them is my account. so please give my ratings back

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    3 years ago, # ^ |
      Vote: I like it -11 Vote: I do not like it

    AFAIK, having more than 1 account is prohibited

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3 years ago, # |
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I'm sorry it was a coincidence.I was not aware and published my code on ideone.com. I respect the community and it would not be repeated next time.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention!

Your solution 56319919 for the problem 1187A significantly coincides with solutions dsheikh/56318585, Malik99/56319919. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

What is this?? It was not a case of plagiarism as such a small snippet of code is likely to be same, it's just a mere coincidence and nothing else. Please undo this action.

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    3 years ago, # ^ |
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    Man, your code and code of dsheikh are actually the same. Just dont cheat next time

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      3 years ago, # ^ |
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      Man, it's just coincidence and nothing else.

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        3 years ago, # ^ |
          Vote: I like it -8 Vote: I do not like it

        The solutions are exactly the same, it cant be a coincidence

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        3 years ago, # ^ |
        Rev. 2   Vote: I like it -8 Vote: I do not like it

        same everything except you change t to z

        just don't cheat to get rating, you will regret it

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention! Your solution 56572241 for the problem 1189B significantly coincides with solutions shahTheshah/56571732, cycle/56572241. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

Attention! Your solution 56572160 for the problem 1189A significantly coincides with solutions shahTheshah/56565707, cycle/56572160. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

Sorry ! I didn't know the rules about submitting same code from two different accounts.Both accounts ("shaTheshah" and "cycle") are mine. I won't repeat this in future. Thanks

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    3 years ago, # ^ |
      Vote: I like it +12 Vote: I do not like it

    Having multiple accounts is also against the rules iirc.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Hello Everyone, I got a message from system that my solution 56579375 for the problem 1189B, has been found significantly similar to someone else's solution and a warning that my account may get blocked due to this. I wrote a very basic solution for that problem which was a short cut method, and it may possibly match with someone else's because no particular algorithm was applied in it and I used basic c++ syntax. I request the community to help me out and make my solutions valid for the round 1189B.

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3 years ago, # |
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sir i used ideone and the user copied my submission from ideone . i did it by mistake sorry for the mistake the person was unrated and had no experience he misused ideone :( .The person name is Anonymous_CF_Tester/57406704 i didnt even knew him punish him he submitted later then me thats also the proof for this take strict action against him

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    3 years ago, # ^ |
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    Hey the same thing happened to me :( And how can i proof ? :(

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Attention!

Your solution 57411020 for the problem 1178B significantly coincides with solutions abhaypatro/57410138, an09mous/57411020. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I got this message after the Global Round 4. I used IDEONE and I think someone stole my B problem. I tried to first submit in Java and got WA and then converted it into c++ and got AC. I didn't know that using IDEONE would cost me this much. Won't use IDEONE again. And of course sorry for this.

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3 years ago, # |
Rev. 3   Vote: I like it 0 Vote: I do not like it

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

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3 years ago, # |
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Attention! __ Your solution 57685386 for the problem 1196D2 significantly coincides with solutions mad_o/57685386, master_chief/57690466. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I received this message with regard to the contest Codeforces Round #575 (Div. 3) . In my defense, I tried my code at ideone for assessing the time boundations. I had absolutely no idea about it's public visibility and these rules of codeforces. I apologise for any of the rule violations I may have unintentionally caused. I assure you that such mistakes won't happen again. I apologise again for the inconveniences caused.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention!

Your solution 57681088 for the problem 1196D1 significantly coincides with solutions surung9898/57681088, thunder_light/57690147, Minimixer/57690460. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

Sorry, I didn't knew that Ideone.com can view other's code. When I was doing the div3 contest, in problem D2, I wrote the DP code but It was not sure that code I written is performed rightly. So I just had ran the D1 code(got the AC) with Ideone.com and just compared the output with my D2 code. It was just all. Sorry, I Apologize for my unintended mistake.

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Rev. 2   Vote: I like it 0 Vote: I do not like it

ideone shouldn't be used during participating in contests as your solutions may be shared with other participants so you may use ideone in private mode(not secret) or the best solution is to use an offline IDE(eg:- DevC++,CodeBlocks) or Codeforces IDE in custom innovation tab or use Geeks for geeks IDE

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3 years ago, # |
  Vote: I like it -10 Vote: I do not like it

Sorry but it was a coincidence. I published my code on ideone.com that's why the problem has occured. Please give my ratings back.

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    3 years ago, # ^ |
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    That’s not what a coincidence is.

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I am really very sorry. I was just coding on the general coding platform of our college, as my laptop’s battery went down. Hence, the code became public and this copy, pasting of code happened. I assure the Codeforces team, that this type of mistake from my end won’t happen anytime again. I am really very very sorry. Please, don’t block my account.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I'm sorry. At the beginning of the educational code forces round 70 (rated for div.2), my network was no longer available, and I thought I couldn't take part in the competition. I got the question through my classmate's network. After I finished it, I submitted it to my classmate's account. Later, my network became available for unknown reasons. I forgot that I have already submitted it to my classmate's account and submitted it to my own account. I promise this will not happen again. If you must ban, please do not ban my classmate's account, ban mine, I will be responsible.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention!

Your solution 58592979 for the problem 1200C significantly coincides with solutions tiger2005/58583425, wzw19991105/58592979. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

why i get this message? problem c's solution is so simple such that my solution is like other's solution.

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  Vote: I like it 0 Vote: I do not like it

ktk.prajapati is my another account .I submitted div2 B from both the accunts so this problem arised, I wasnt aware of the rules.so consider my actions as foolish mistake and dont penalise me!

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  Vote: I like it -12 Vote: I do not like it
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    3 years ago, # ^ |
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    Yes Dude. Similar Problem

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      3 years ago, # ^ |
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      Both my friend and I found this problem and used the same template and was checked :(

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

After the system testing of Codeforces Round #578 (Div. 2) I had received the following message.

Attention!

Your solution 58611222 for the problem 1200B significantly coincides with solutions _mitchell/58611222, Pr0n4x/58612964. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I am really sorry for using the default settings on ideone.

My submission which coincides with Pr0n4x's submission : http://codeforces.com/contest/1200/submission/58611222

My submission made 51m:14s before that submission: http://codeforces.com/contest/1200/submission/58595209

These two codes are almost similar, the difference being 4 lines were modified in the accepted solution.

My submission of the solution of a another problem which was made before this contest: http://codeforces.com/contest/1201/submission/58273364

The code #58611222 has similar template portion of this old submission #58273364. I have been using this template for quite a while now. I hope this prove that I was the original author of that code. I am really sorry for using the public settings of ideone. It won't happen again. Thanks a lot.

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

I got a mail saying :

Harshil_Bhavsar Attention!

Your solution 58750510 for the problem 1203A significantly coincides with solutions Harshil_Bhavsar/58750510, gaurav2026/58758381. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I really don't have any clue about how my submission was similar as the other person mentioned here. For this question I didn't need to pick any code for the solution from anywhere. So I don't have any proof in favor of myself . But I expect that I should not be penalised because of such a coincidence and I just hope that such coincidence never happens with me again.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry, I Shared my code with my teammate in the contest, but he has passed this problem, maybe he Shared my code with others. It won't happen again

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3 years ago, # |
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I apologizes to you for I'dont know your rules clearly. Actually both oldherd and froldH are my accouts. I'm sorry for using these two accouts to attend the round and waste your time. But would you mind to cancel my punishment? You can check my IP to confirm that both froldH and oldherd are my accounts. And that will never happen again.

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3 years ago, # |
Rev. 3   Vote: I like it 0 Vote: I do not like it

Hello Everyone, This morning I got a message from system that my submission for 1207A shahayush457/59278266 and 1207B shahayush457/59284151 during the Contest, has been found significantly similar to someone else's solution and a warning that my account may get blocked due to this. I was not aware about ideone.com and I was using it since the day I joined codeforces and for the first time someone has copied my code from ideone. I assure that this will not be repeated. For evidence you may have a look at his solution where he has copied my whole template along with my name and college name written on it anonanon/59284289 . You can also look that both of my submissions were made well before him. So, I request the community to help me out and make my solutions valid for the Educational Codeforces round 71 Div.2.

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3 years ago, # |
  Vote: I like it +4 Vote: I do not like it

Hello Codeforces, I got the below message from the system after yesterday's Educational Codeforces Round 72.

Attention!

Your solution 60112264 for the problem 1217F significantly coincides with solutions YangDavid/60108293, Return.Hao/60112264. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

In this contest, I use the template from https://loj.ac/submission/27031, to solve the problem F. As it's submission time(2017-10-07) is notably earlier than the contest time(2019-09-06), I firmly believe it can be a conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition. Therefore, I appeal to valid my solutions for Educational Codeforces Round 72.

Thanks.

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Rev. 8   Vote: I like it -10 Vote: I do not like it

Hello,

Attention!

Your solution 60109295 for the problem 1217B significantly coincides with solutions HoldTight/60093170, Piccadilly/60109295. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I apologizes to you for I don't know your rules clearly.To be honest, both Piccadilly and HoldTight(For Practice purpose ,I have created this recently) are my accounts.I'm really sorry for using these two accounts to attend the contest(Trust me ,I have no intention to attend contest from both ID .I have accidentally submitted solution from my Piccadilly account (I am checking standing from Piccadilly account ,checking current standing of my friends).You can verify this fact by submission timing of both account.

I was not aware of the rules.I have gone through all rules and regulations once again.So consider my actions as foolish mistake and don't penalize me.This won't repeat in future and I will be careful from here on.

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Hi Mike, I've received this message "Your solution 60556771 for the problem 1209C significantly coincides with solutions know_no_algo/60556320 and xDxD/60560299... etc" I was using ideone with the default settings as I wasn't familiar with it and I'm so sorry for that. I also was struggling with the problem as I also got multiple wrong answers in it. Therefore, that proves that I was trying to solve it.

Anyway, I'm sorry and I won't use ideone again (that was my first time) and I was hoping if you can resolve the issue if possible and get my contest points (even if the points for problem A if I can't get C's points) as I was really hoping to be a pupil this round.

Again I'm sorry for what I've done and won't happen again.

Thanks. Have a great day.

http://codeforces.com/contest/1209

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention! Your solution 60568891 for the problem 1209G1 significantly coincides with solutions 201831990439/60567197, zulongfei/60568891. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation.

He(201831990439) and I are good friends.He's really much better than me,so I imitate his code style,and also ask for ideas during the match,only for the ideas,and no copy.I wrote this code according to his idea, but there was repetition. I'm very sorry.I can don't want the G1 score, but as long as the score of the remaining topics, please agree with my request. Thank you.

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Asking for solutions during contest is a type of cheating and violates the rules.

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    3 years ago, # ^ |
    Rev. 5   Vote: I like it +12 Vote: I do not like it

    When you register a codeforces round, you should read the terms of agreement.

    • have read the contest rules
    • will not violate the rules
    • will not communicate with other participants, use another person's code for solutions/generators, share ideas of solutions and hacks
    • will not attempt to deliberately destabilize the testing process and try to hack the contest system in any form
    • will not use multiple accounts and will take part in the contest using your personal and the single account.

    Term 3 asks you to solve problems independently.

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      3 years ago, # ^ |
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      I accept the punishment. Thank you for reminding me that I will not violate the rules .

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I got a message from system that my solution 61138460 for the problem 1230A significantly coincides with solutions nafiscode/61138460, tourist_plus_kan/61141927.

It was really a coincidence. I solved the problem by myself. I didn't take help from anyone. I didn't publish the code anywhere.

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I am really sorry for the violation caused. To be honest I am a very noob programmer. And last time (Div 3) my contest was supposedly going good. But then when even after the submission and upon pressing the refresh button again and again to see if it turns red or green didn't work. I panicked. And told my friend to submit the same answer, sending the code over whatsapp if she gets the verdict or not. There were quite a few submissions already with a verdict in her account. But then Codeforces Notification popped up saying the delay time in the queue for submissions. By then the damage had been done.

I am extremely sorry for the violation of the rules. And take the entire blame on me for the thing happened here.

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Is there some sort of requirement to make a public apology on this blog? It's kind of annoying that every three days this blog pops up with some sob story. I mean you aren't getting your rating or anything back, so what is the point of posting here.

    Just move on, you made a mistake, don't do it again, all is forgiven.

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  Vote: I like it -16 Vote: I do not like it

Hi, I am new to this website also to cp. I recently participated in Round 594 div2 and I got a mail from admin that code which i submitted for problem 1248A matches with cerberus87/62978380 I was shocked as i didin't share code with anyone so i went to that submission of cerberus87 to check his code and code is exactly same, then after reading few comments on this page i got to know that my code was taken from ideone where I tested it.It was my mistake to keep option as public and test it on ideone. So i request admin not to ban my account and I promise that I'll not repeat this again.

Also , out of interest i just want to know how do other users steal code from ideone and how do they identify the problem.I also doubt that cerberus87 is a dummy account as it was just created before start of exam and user was not active after completetion of exam

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3 years ago, # |
Rev. 6   Vote: I like it 0 Vote: I do not like it

Hello Everyone, Today I Recieved "Your solution 63311611 for the problem 1251A significantly coincides with solutions mindJuice/63309844, gabish01/63311611" for Educational Codeforces Round 75 (Rated for Div. 2). This is because both accounts are mine, Both have autofill login details, so I accidently logged in using my alt account(mindJuice) which also happened for previous contest codeforces round #595 in which i continued on my alt account and didn't use my main account. In tomorrow's contest Educational Codeforces Round 75 (Rated for Div. 2) I was logged into my alt account from previous days and I had submitted solution for problem 1251A until i realize i was not logged in to my main account as I always give my contests using my main account(gabish01) so i logged out and submitted 1251A solution again using my main account and continued on that account, which was a mistake. You can even see my alt account Last Submissions is only 1251A and no attempt after that and you can also check the Last Visit of my alt account. That's all i can say to prove my innocence as that's what happened. Sorry for Violation of Rules, it won't happen again.

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    3 years ago, # ^ |
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    Well, alt accounts aren't allowed, soooo...

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yuzhechuan / 63481947 solution for contest:I dont know this happened but because of my ideone.com public. sorry i will see that this doesn't repeat again.

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sorry,I have used two account

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Why unrate me. I did it myself

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention!

Your solution 66352851 for the problem 1264E significantly coincides with solutions disposrestfulIy/66342618, yuguotianqing/66351221, SpiderDance/66352851. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

the common source is here https://www.luogu.com.cn/problemnew/solution/P4249

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3 years ago, # |
Rev. 2   Vote: I like it +75 Vote: I do not like it

Good morning everybody.

In Codeforces Round #604 div1, my submission is skipped. But I didn't copy code. The submissions what are checked 66350141, 66352679. It not same even the mothod of inverse.This problem if you can infer /sigma_p{c(p-x,a)*c(p-y,b)*p} to x*c(a+b,b-x+y)+a*c(a+b-1, b-x+y-1). And the method is same as Chinese contest noi d2t2. And I can control it.And you can see Gromah D1 and gisp_zjz D2. And you can see it easy to look like.

Please admin MikeMirzayanov check it, thanks.

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    3 years ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    Hi!

    The matched submissions are:

    I see that they are completely equal, the main parts of solutions use the same variables, same flow of calculations, same type-cast tricks and so on.

    Please, provide me the common source (exact link, not a generic description). I don't have an idea of what is Gromah D1 and gisp_zjz D2. Give us the links. Codeforces provides you an easy way to share a submission link. Anyway, I don't think other solutions are so close as 66350141 and 66352679.

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3 years ago, # |
  Vote: I like it +11 Vote: I do not like it

As discussed in https://codeforces.com/blog/entry/71916#comments, #604 Div.1 E is a similar problem with the one in Chinese Contest WinterCamp 2007, you can find the problem description in https://www.luogu.com.cn/problem/P4249, and I used the solution code in https://www.luogu.com.cn/problemnew/solution/P4249, which was published in 2018.

I think I should not be unrated for #604.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention!

Your solution 66347301 for the problem 1264E significantly coincides with solutions jiangly/66346874, Rose_max/66347301, KotonohaKatsura/66350584. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked

For CodeforcesRound604 Div1 E,it can be showed that this problem is quite similar to a problem in Chinese Contest WinterCamp 2007,the code can be easily searched by Baidu or Google. for example,the following blog posted the code in 2018 https://www.cnblogs.com/zhoushuyu/p/9146420.html

According to the rule about the Third Party code,i think i should not be unrated. Please investigate this matter,Greatly thanks.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

My friends and I were at the same place, we all entered the last Codeforces Round #605 but we were not talking during solving any problem. I solved the first question by myself and tried the other questions. I don't know that they copied my code, it's possible because all our screens are open, we were at the same place... But I guarantee that I solved the question by myself and didn't copied it from any other source, also didn't shared it with my friends. You can understand that I am the first and only person in our group that solved the first question, by looking at the time that I solved. I want my ratings back.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I participated in the Codeforces Round # 608 (Div. 2) and in problem D, I think there are many solutions, but because I have just learned a new algorithm, I tried it in problem D. I think the problem of D I like the other song just a coincidence. I hope I can get ranked

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I've received the message

" Your solution 67105563 for the problem 1266D significantly coincides with solutions code026/67105563, apoorv024/67108912 "

Apparently that person seems to have ripped off all codes of today's contest. I have in no way posted on any platform, nor do i know the person. Neither have I copied any algorithm from any platform. The message asked for evidence. I think , my previous attempt , which failed at test case 5 , and then i debugged it, is a clear evidence that I've written the code myself. I'm dropping this message because the message I received mentioned me to do so. Kindly look into it.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I just received a message from System admin : "Your solution 67108912 for the problem 1266D significantly coincides with solutions code026/67105563, apoorv024/67108912. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation"

I have not posted this solution anywhere and have it only on my local machine. It is purely a coincidence that the other guy had the same algorithm and implementation. It is a fairly small and simple solution so I don't that its really improbable to get similar solutions. Please add me back to the contest.

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    I see that the other guy's (@code026) submissions have been restored but mine are still in skipped state. I am in no position to provide any evidence that I haven't cheated. And if the other person has provided proof about it, then it should be considered for me as well, right ? I request you to please restore my submissions and update my ranking and ratings.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

First, I don't know the author about 1278a, and I don't know where to see his code. My code is my own. Second, the question about 1278c is that I mistakenly copied my classmate's code after asking my classmate's ideas, and then resubmitted a code written by myself. I hope the organizer can forgive meFirst, I don't know the author about 1278a, and I don't know where to see his code. My code is my own. Second, the question about 1278c is that I mistakenly copied my classmate's code after asking my classmate's ideas, and then resubmitted a code written by myself. I hope the organizer can forgive me

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

As for the 1278c question, my classmate asked me the idea, and then he typed it again after he understood it. When he submitted it, he mistakenly copied my code. Later, he resubmitted a code he wrote himself. I hope the organizer can forgive me

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I'm sorry for my negligence. Today I receive a talk to my account. Attention!

Your solution 67232801 for the problem 1278D significantly coincides with solutions 404_Not_f0und/67232801, Performanceartist/67233518. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I thought for myself and got the solution to the problem 1278D. Just use and "dsu" to optimize the brute force algorithm. But I was not familiar with and made a stupid mistake, so I shared the opinion to my friend. Before he answered me, I found the mistake, corrected it and submitted my solution. I was not aware that my friend hasn't completed his solution and he just corrected and sumbitted the solution I sent to him.

I don't know the rules and shared my solution freely. I promise I won't share my solutions with anyone in the future.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I have made a big mistake and i really feel ashamed of it. I promise it won't happen again. I want to apologize for violating the rules of the community and contest. Sorry for everything sir, please let me continue with my profile for participating here. Sorry.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I don’t know who is this guy kjnkjn and i'm sure that my solution 67730219 for the problem 1279B

is my code

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3 years ago, # |
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Sir the code I have written is mine I have used ideone because geeks for geeks ide was not working so I don't know who the other people are but that was my own code

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3 years ago, # |
Rev. 4   Vote: I like it +1 Vote: I do not like it

Respected sir MikeMirzayanov, padamprakash2502 is my another account and in the contest #611 i submitted the same solution for problem 1283c which you can verify by checking submission time of two which is less than a minute .i was genuinely not aware of the fact that we cannot submit same solution from two different accounts. This was unintentionally generic mistake for which i am really sorry . And as per the rules i admit my mistake and will not use the account my another account padamprakash2502 further . i will take care of all the rules from next time onwards. Again i am genuinely sorry. Kindly do the needful and please update my rating as i have been using this account for participating in contests.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I used another account to submit the solutions of 1283B and 1283A. I did not know this was against the rules and I am sorry, I will not repeat this in the future

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3 years ago, # |
Rev. 2   Vote: I like it +8 Vote: I do not like it

Is there some requirement now to post your sob stories and/or deeply heartfelt apologies under this blog? I for one am sick of seeing this blog pop up every week with some "most esteemed sir MikeMirzayanov, i am so greatly sorry but i didnt know it was against the rules to ask soluton from frends during contest" shit.

NOBODY CARES about how sorry you are. This blog is for when you were actually unfairly disqualified (i.e. used code from a public source and the plagiarism detector picked it up).

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Hi Mike! I recently got this message : Your solution 68252538 for the problem 1287A significantly coincides with solutions dejavucoder/68252538, Syedshajib_CoU/68259314. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I typed the code myself and submitted at 19:55 (IST) and got AC in the first attempt. The other person got AC at 20:47(IST). He took more attempts. His final solution is different from his previous solutions but his code is different and shorter than mine. I think either he wrote the solution on his own or he copied someone else's solution. It's not mine.

I checked my history and saw that I had public mode on on IDEONE. I apologise for that and will make sure that I switch to private mode if I use Ideone in future contests.

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    3 years ago, # ^ |
      Vote: I like it +12 Vote: I do not like it

     Your codes are totally equal. Same codestyle, same variable names, even `// end of if`` comment is present in both solutions. He definitely copied it. Probably that's because he was kind of upset he couldn't solve that task on his own and was about to lose his rating. So he found your code on ideone and copied it.

    That's no problem if you got this warning once, if you did not send your codes to other people intentionally. Just be careful next time. You can use, for example, cpp.sh to compile and run your CPP code online. You won't forget to make your code private just because this service doesn't have this feature.

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Attention!

Your solution 68805765 for the problem 1288B significantly coincides with solutions sayan_244/68805765, driver425/68807477, stopthegame/68809793, Knight_lock/68809843. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

Attention!

Your solution 68795113 for the problem 1288A significantly coincides with solutions sayan_244/68795113, coder_aditya/68801955. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

Hello. I have been using IDEone for generating my code files. I never bothered about the public access on IDEone as I have never had any issues so far with it. (which by all means I had no idea could be made use of in such a manner)

I am new to CF and this is my first such message. I wasn't aware about it.

I just viewed the code for 1288A submission and it does match 100% with mine. Same with 128B.

I dug my history and found the IDEone submissions I made.

https://ideone.com/pB6llK

for 128A (It shows created 1 hour before. I was checking some hack cases right after the contest ended)

https://ideone.com/8yl3AZ

for 128B

I will be careful from now onwards.

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

....................................

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3 years ago, # |
Rev. 2   Vote: I like it -8 Vote: I do not like it

Hello sir! My cf handle is harit29gangwani and I got caught on plag check since it was me submitting codes on both accounts, harit29gangwani and harit29dec04 Actually I just remembered today that I had an old CF account and since both had a similar rating, I submitted from both accounts to see which one gets a higher rating I will not use the account "harit29dec04" from now on and won't ever repeat this again Thank you

Proof: They were submitted within 10-20 seconds of each other. I apologize to you for I don't know your rules clearly. Actually both harit29dec04 and harit29gangwani are my accounts. I'm sorry for using these two accounts to attend the round and waste your time. But would you please mind to cancel my punishment? You can check my IP to confirm that both harit29dec04 and harit29gangwani are my accounts and are the exact same solutions. And that will never happen again.

Thank you so much

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3 years ago, # |
  Vote: I like it +29 Vote: I do not like it

Ffs, stop posting pointless comments. It would be great if admins could disable the comment section on this blog. As pointed out by -is-this-fft-, it is ridiculously irritating to have this pop up in recent actions because some people have zero clue how Codeforces works and think this blog is some magical way to contact Mike.

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    3 years ago, # ^ |
      Vote: I like it -29 Vote: I do not like it

    I'm very sorry sir I'm a school student and this was my 5th contest Please consider my solution for this round as they were both my accounts only, otherwise, how could they have the same email address, name, school and the same solution posted within seconds of each other. It will never happen again as I won't use my old account from now on

    Yours sincerely

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Judging by the email/PM that gets copied here sometimes, I think you are actually supposed to post your appeals in a public comment. So I think the comments can't be locked.

    The problem is that apparently some people don't get that "you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition" does not mean "I am very sorry, I didn't know the rules and asked solutions from a friend".

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      3 years ago, # ^ |
        Vote: I like it +17 Vote: I do not like it

      Hadn't realised that's the proposed way of appeals. In that case it'd sure be nice to just have this post as an exception that doesn't ever show in "Recent Actions". Otherwise it's a bit like the entirety of Codeforces is subscribed to Customer Support.

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3 years ago, # |
  Vote: I like it -28 Vote: I do not like it

Sorry actually I was using ideone and due to which this error might have occcured and I assure to take care on any such mishappening further on. This was purely due to some coincidence.

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3 years ago, # |
  Vote: I like it -10 Vote: I do not like it

Hello sir. I have received a text that My solution coincide with another ID. I am really sorry that. It was my friend's ID. He asked me that how I have solved question A. So I send my code to him. As it was his first contest he didn't know about the copyright violation. Please forgive us. It was a mistake. And That will never repeat. MikeMirzayanov

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

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3 years ago, # |
  Vote: I like it +10 Vote: I do not like it

Call me racist but most of the whining (I repeat, whining, not false alarm reports) are from those greys and greens and cyans, and guess what, they stay almost the same (both in rating and attitude) after all the time.

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Maybe they stay that way because they only participate in your contests.

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      3 years ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      Maybe you stay your way because you have no better thing than whining at my round (even though I'm certain you don't give a f*ck of its actual content).
      Also, read your own comment out loud and think of its literal validity before proceeding.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Hello, I'm sorry that I broke the rules. I have my own opinions on problem B, but it's not enough to solve it. So I asked my friend for help. I promise I won't have another chance. Please give me a chance

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

A-70053242 B-70062291 C-70073631
These are my own answers, all before the incident. After I finished, I used my computer to help my classmate submit(A-70074197 & B-70073981) (he couldn't connect to the server) and forgot to change to his account. I'm sorry. I hope you can revoke the violation record under my account. Thank you.

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3 years ago, # |
Rev. 2   Vote: I like it +8 Vote: I do not like it

Seriously... this thing is popping up in recent actions every time a contest ends.

Can admins disable the comments feature for this page?

I mean, most thing posted here are all in the following format:

I'm sorry, I (used Ideone/asked my friend/talked with my friend/used another account), I did not know it's illegal and I promise I won't do that again.

This is just not right, I mean, reading rules is the first thing, and not reading the rules does not mean we should take mercy, and this thing pops up every day.

I'm fed up of this, so if it's possible, just disable the comments.

upd it seems that some people really are doing something here (they have strong clues), in this case, just do not let this blog post pop up in recent actions.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

My solution to the 1291b problem 70051751 is very consistent with that in annualring / 70051751. I'm curious. Isn't this person myself? Then I set myself up as an untrusted user, which makes me sad.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

My solution to the 1291a problem 70042290 is very consistent with that in annualring / 70042290. I'm curious. Isn't this person myself? Then I set myself up as an untrusted user, which makes me sad.

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3 years ago, # |
  Vote: I like it -10 Vote: I do not like it

Hello, sir. Ca1xukun is my other account, I submitted the same solution, I don't know I can't submit the same solution from two different accounts I'm really sorry that I made such a big mistake. Next time I'll follow all the rules. If you can, I hope to get your forgiveness.

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3 years ago, # |
  Vote: I like it -27 Vote: I do not like it

hello codeforces, i had a message after Codeforces Round #617 (Div. 3) .which says that Your solution 70267322 for the problem 1296B significantly coincides with solutions Iron_man_3000love/70267322, RUDRO_BU_CSE/70289774. .i want to say that both of the accounts( Iron_man_3000love and RUDRO_BU_CSE ) were mine and i don't know the rules of submissions . But i promise that the solutions of both accounts is completely mine, and i won't make this mistake again.Don't block my accounts please..

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3 years ago, # |
Rev. 2   Vote: I like it -27 Vote: I do not like it

hello codeforces, i had a message after Codeforces Round #617 (Div. 3) .which says that Your solution 70289774 for the problem 1296B significantly coincides with solutions Iron_man_3000love/70267322, RUDRO_BU_CSE/70289774.i want to say that both of the accounts( Iron_man_3000love and RUDRO_BU_CSE ) were mine and i don't know the rules of submissions . But i promise that the solutions of both accounts is completely mine, and i won't make this mistake again.Don't block my accounts please...I posted it from that(main) account too..

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Sorry to disturb, my solution 70674217 for the problem 1300D significantly coincides with solutions 70676934, this simple code is from a previous blog that has been published for months. The URL is https://blog.csdn.net/weixin_30559481/article/details/99069024. We may just happen to use this blog at the same time instead of copying each other, thanks.

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

How to view the code that wants to be the same with oneself, I am a little suspect is system misjudgment!

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    3 years ago, # ^ |
    Rev. 2   Vote: I like it +12 Vote: I do not like it

    If you're given the email, there will be the id of your submission along with such of the supposed-plagiarizing submission.

    To view a submission by ID, using the link: https://codeforces.com/contest/[contestID]/submission/[submissionID].

    The [contestID] should usually be the id included in the problem that you've been caught.

    UPD: There can be a hack if you're totally unsure about the contest id. At the text editor used to type a comment in Codeforces, add a submission hyperlink, type in the id and then press "Preview" below the editor. Click the hyperlink showed on the comment preview to proceed (as long as you don't click "post", no comment will be made).

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3 years ago, # |
Rev. 2   Vote: I like it -10 Vote: I do not like it

confirm.

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Please look the submission mentioned below: by CaEdta : 70240740 and by me : 70243563 this was a question in the previous contest. From there, you can observe that we have been using the same templates. Yes, we are friends studing in same college. The solution in which our code matched was just a five line solution and those five lines were quite obvious once you have thought the solution. So, please consider my solution since this was a mere coincidence which obviously was unlikely to happen if we had used different template.

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Yes, I approve this. We didn't share anything during contest.

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3 years ago, # |
  Vote: I like it +4 Vote: I do not like it

After the Educational Round 82 I recieved a message:

Attention!

Your solution 70901769 for the problem 1303E significantly coincides with solutions ix35/70885314, Karry5307/70901769. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.ml/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

I have no idea about why my solution coincides with that solution. I don't know him and didn't publish my code to ideone.com...

I request the community to help me out here as I don't know whom should I contact about this.

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    3 years ago, # ^ |
      Vote: I like it +5 Vote: I do not like it

    Yes, our codes are totally different in main function.

    The only thing that our codes have in common is in check function, where our ways to do dynamic programming are very similar. I think it is just by chance.

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    MikeMirzayanov don't make it unrated plz

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    don't make it unrated plz

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

for first time offence is the account banned? i did not know that we were not allowed 2 ID on codeforces. i will not be using my other ID since my last contest was not submitted

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3 years ago, # |
  Vote: I like it +7 Vote: I do not like it

Hello, when I solving the problem E of Div.2-620. I found the problem should use LCA algorithm. However, I don't have the LCA template in my current computer, So I search the LCA template from the internet.

Here is my used template hyperlink: https://www.codeleading.com/article/8225969543/;jsessionid=5E9F8D2A3A0E8C43BF245320925CF568

May be user XRDS-BJFU101 used the same existing template and cause the mistake.

Here are our submissions: Bert/71163200 XRDS-BJFU101/71165359

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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Attention! Your solution 71165359? for the problem 1304E significantly coincides with solutions Bert/71163200, XRDS-BJFU101/71165359. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

Hello,I just received this email. When I solving the problem E of Div.2-620. I found the problem is a easy problem.(just need LCA template).Then I used my LCA template,but my LCA template is from the internet. This is the address of LCA template.(before this contest) https://www.codeleading.com/article/8225969543/;jsessionid=5E9F8D2A3A0E8C43BF245320925CF568 Maybe Bert coincidentally used a similar board. Actually, we don't know each other.

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3 years ago, # |
  Vote: I like it -10 Vote: I do not like it

I got a message saying that my solution for problem 1304E coincides with that of some other participants. I used the CP Algorithms implementation for LCA which you can find here: https://cp-algorithms.com/graph/lca.html. This was published before the start of Codeforces Round #620 (Div. 2) and so it does not count as a violation of the rules.

Although I added a few additional methods in my source code, a big chunk of my solution was for the LCA structure. So I guess that could've set off the response. I hope this clears things up.

If you need any more information, please let me know.

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3 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

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3 years ago, # |
  Vote: I like it +3 Vote: I do not like it

Attention!

Your solution 72448213 for the problem 1316C significantly coincides with solutions lc23/72447573, Ming_ling/72448213. Such a coincidence is a clear rules violation. Note that unintentional leakage is also a violation. For example, do not use ideone.com with the default settings (public access to your code). If you have conclusive evidence that a coincidence has occurred due to the use of a common source published before the competition, write a comment to post about the round with all the details. More information can be found at http://codeforces.com/blog/entry/8790. Such violation of the rules may be the reason for blocking your account or other penalties. In case of repeated violations, your account may be blocked.

The solution of 1316C was previously available online.This is the website:https://baike.baidu.com/item/%E6%9C%AC%E5%8E%9F%E5%A4%9A%E9%A1%B9%E5%BC%8F/3246261?fr=aladdin The site is China's equivalent of wikipedia.As for the preprocessing, as well as the quick read-in readout function, we have been in a team, and this is the "template" that we have established for each other, and I don't think it's surprising that we have the same.

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3 years ago, # |
  Vote: I like it +3 Vote: I do not like it