### MikeMirzayanov's blog

By MikeMirzayanov, 5 years ago, translation, ,

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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 » 5 years ago, # | ← Rev. 2 →   +49 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?)
•  » » 5 years ago, # ^ |   0 Same question for code snippets published on codeforces.com/blog/
•  » » 5 years ago, # ^ |   -11 Generally speaking, no, authors do not have obligation to release their code into public domain, they only provide unexclusive license for TopCoder
 » 20 months ago, # |   -14 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?
•  » » 11 months ago, # ^ | ← Rev. 2 →   -31 It is not polite (and does not serve well to the community) to downvote a comment without any useful reply.
•  » » » 11 months ago, # ^ |   0 As we can see, anonymity of the voting system encourages coward and irresponsible behaviour of the voters.
•  » » » » 11 months ago, # ^ |   +16 What exactly is cowardly about downvoting you?
•  » » » » » 11 months ago, # ^ | ← Rev. 2 →   -23 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.
•  » » » » » » 11 months ago, # ^ |   +6 Okay so this is just arguing for the sake of it, but... Contribution score doesn't matter. "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.
•  » » » » » » » 11 months ago, # ^ | ← Rev. 2 →   +3 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.
•  » » » » » » » 11 months ago, # ^ |   0 "Coward" means one is afraid to take a risk. Agree.And this actually does not cover ones who are not afraid to take the risks but just too lazy busy to explain themselves. On the other hand, I would not call such behaviour responsible (giving to the community is important, just taking from it is not good).
•  » » » » » » » 2 months ago, # ^ |   0 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?
•  » » » » » » 7 months ago, # ^ |   +14 Stackoverflow tried to solve this problem by removing 1 point from your reputation when you downvote something.
•  » » » » » 11 months ago, # ^ |   -10 (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.
•  » » » » » » 3 months ago, # ^ |   +8 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.
 » 11 months ago, # |   +1 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 !
•  » » 11 months ago, # ^ |   -25 I Agree.I am using Ideone keeping it secret since 15 contests.It has not done yet.don't skip my contest.plzz consider my case...!! MikeMirzayanov
 » 11 months ago, # |   -13 delete2, coutinho, OutSpace, blindspot — this is 4 photo machines. You will can’t better, lol
 » 10 months ago, # |   +4 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.
•  » » 10 months ago, # ^ |   +2 For sure it is a technical mistake and it will be fixed today. Sorry about it....And Happy New Year!
•  » » » 10 months ago, # ^ |   0 Thanks a ton for everything sir :)
 » 9 months ago, # | ← Rev. 2 →   -9 :(
•  » » 9 months ago, # ^ |   +12 I also made such stupid mistake. Sure, it is so awkward.
 » 9 months ago, # | ← Rev. 2 →   -20 sir, coder_tuntun is my another account . and in today's contest #459 i submitted same solution for problem b , and i was not aware of the fact that we cannot submit same solution from two different accounts. this was unintentionally ...i feel really really sorry for such a big mistake from my side.i will take care of all the rules from next time onwards. please forgive me this time. sir please update my rating i solved both A and B.
•  » » 9 months ago, # ^ |   -8 Sir, in this case why you update rating of my coder_tuntun account and cancelled on the tintin account. If you want to cancel then please cancel it on coder_tuntun account. And sir please reply.thank you.
 » 9 months ago, # | ← Rev. 3 →   -8 Solution to problem Codeforces Round #459 Div.2 question A. Eleven was already available on the internet and it is well before the contest. Please visit source — https://www.geeksforgeeks.org/check-number-fibonacci-number/ to confirm. I got a message from the System and it stated that My code matches with someone else's code . And my code got skipped.
 » 9 months ago, # | ← Rev. 2 →   0 Hello Everyone, This morning I got a message from system that my submission for 918A khyati.agarwalss/34669006 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 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 a saved syntax of jdoodle/c++. I request the community to help me out and make my solutions valid for the round 918 Div.2.
 » 9 months ago, # | ← Rev. 2 →   -8 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.
 » 9 months ago, # |   -8 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.
 » 9 months ago, # |   -12 This is my another id that was opened with another browser... unfortunately I submitted Codeforces Round #460 (Div. 2) B from #RAKIB_CSE_14#..... Then i submit from #Logical_Error# account.
 » 9 months ago, # |   -8 RAKIB_CSE_14 is my another id that was opened with another browser... unfortunately I submitted Codeforces Round #460 (Div. 2) B from RAKIB_CSE_14..... Then i submit from this account..
 » 9 months ago, # |   0 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
 » 8 months ago, # |   +1 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
 » 8 months ago, # |   0 "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 :/
 » 8 months ago, # | ← Rev. 2 →   0 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.
 » 8 months ago, # |   0 OK I do not know how this happened, and I was sure that I do not know this person at all. And when I entered his account, it turned out that he had been registered for a very short time, so how can I know him? I swear I did not take this solution from any Someone, whatever. Thank you
•  » » 8 months ago, # ^ |   0 Please I want my rank ...because I do nothing
 » 8 months ago, # |   0 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!
•  » » 8 months ago, # ^ |   +1 Having more than one account is prohibited by the rules AFAIK.
 » 8 months ago, # |   0 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?
•  » » 8 months ago, # ^ |   0 I wanna to know that same as you !
 » 8 months ago, # |   0 I'm sorry to have happened such a thing, and I won't do it again. I had a fluke in the game.
 » 8 months ago, # |   -12 I don't know how it happened I have used logic which I have seen in the internet
 » 7 months ago, # | ← Rev. 3 →   -28 Today I got a message after Educational Codeforces Round 39 (Rated for Div. 2) that solution 36000027 for the problem 946A significantly coincides with solutions yashwant750/35999435, yash750/36000027. I want to tell that both of are my accounts and I didn't had any idea that 2 accounts are prohibited,so I am really sorry about it and I assure you that it wont happen in future and I won't be using the other ID from now on.
 » 7 months ago, # | ← Rev. 6 →   -31 Because the account is mine.I submit my code on my account and i submit it with this account. Whatever,i am sorry for this thing happened.I promise it won't happen again.
 » 7 months ago, # | ← Rev. 2 →   -28 Sorry about that...But both of these accounts are actually mine. Please consider my submission and give me my rank back. And this will never happen again in future.
 » 7 months ago, # |   0 In Codeforces Round #469 (Div. 2),when I was doing problem C,I communicate with another friend. He sent me his error code. I submitted it after correcting it. He also submitted it after correcting it.I'm sorry to have happened such a thing, and I won't do it again.
 » 7 months ago, # |   -23 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.
•  » » 7 months ago, # ^ |   +3 The solutions are not similar, they are completely the same. No one can believe in such coincidences.
•  » » » 7 months ago, # ^ |   0 Nice memessame code + same compiler
•  » » » » 7 months ago, # ^ |   0 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)
•  » » » » » 7 months ago, # ^ |   0 Thank you for clarification
 » 7 months ago, # |   -20 Why??
 » 7 months ago, # |   -15 Why did my solution got skipped?
 » 6 months ago, # |   +19 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.cppSolutions 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.
•  » » 6 months ago, # ^ | ← Rev. 2 →   +7 The exact same thing happened with me !!I copied Petr's code, I thought it would be better than the editorial anyway xDThis is my submission:http://codeforces.com/contest/962/submission/37169973This is Petr's submission on the problem from Goodbye 2017 round:http://codeforces.com/contest/908/submission/33777962This code was written before the start of the round. Apparently someone else copied the same code and I was charged with it being a violation?? I don't think that's fair.
•  » » 6 months ago, # ^ |   +8 I just saw that somebody else has written about our common problem, tell me if something changes for you.
 » 6 months ago, # |   0 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.
 » 6 months ago, # |   +8 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.
•  » » 6 months ago, # ^ |   +8 https://www.dropbox.com/sh/i9cxj44tvv5pqvn/AAB1_2Q0XKvKiOA1ukvcNIuUa/F?dl=0&preview=F.cpp And this is the source code
 » 6 months ago, # |   +13 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/33800403I 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.
 » 6 months ago, # |   -18 sir they both are my account and i didn't know about the submission policies .... please don't block or penalty my account ...i assure you this will not happen again
 » 6 months ago, # |   0 Sorry, I don't know the code can't be discussed, this is the result I discussed with him.
 » 5 months ago, # |   -12 hello codeforces, i had a message after Codeforces Round #481 (Div. 3) which says that your solution 38168041 for the problem 978B significantly coincides with solutions mithun_rahman/38167870, codefresher/38168041.i want to say that this is just a coincidence.I had evidence to prove it.But for some reason i lost it.But i want to say that this code is mine.I request you to check the code for the contest and please make it valid.I also thank you to know the rules.and please don't block my account...→ Reply
 » 5 months ago, # |   -12 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,
•  » » 5 months ago, # ^ |   -12 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!!!!!
 » 5 months ago, # |   0 I did this question before this competition .I was having the solution file so i just copied my solution it. This may be the coincidence he got the same code from the website. i don't remember the name of educational website.
 » 5 months ago, # |   0 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
•  » » 5 months ago, # ^ |   0 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.
 » 4 months ago, # |   0 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
 » 4 months ago, # |   -6 I got it from online reference so it might be familiar. I will make sure to improvise from now Thank you.,
 » 3 months ago, # |   0 I write this comment in regard to the mail i got from codeforces for problem 1005D. Me and my friend Smit were solving this problem together in the same place. So the solution is same. I'm sorry for this. it won't happen again.
 » 3 months ago, # |   0 Sorry I unintentionally used ideone.com for writing code and someone must have used it to see my solution. This won't happen later.
•  » » 3 months ago, # ^ |   +12 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.
 » 3 months ago, # |   0 Attention!Your solution 40945148 for the problem 1013A significantly coincides with solutions **/40942768, **/40945148. 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 created account cn18 just to see and access API of codeforces. But when the comp started I by mistakenly submitted by code using cn18 id instead of my id. On realizing it I shut down my id there was no way to remove the code from cn18 id. Sorry, it was my mistake. Moreover, you can see how easy the solution was. I didn't do it purposely.
 » 3 months ago, # |   0 why u r not applying this then
 » 3 months ago, # |   0 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?
 » 3 months ago, # |   0 Solution 41051114 for the problem 1015C significantly coincides with solutions saxapo/41050928, 177shivam/41051114 since both the solution is same because it is written by me only. Sir since website is not working smoothly so i have to submit my answer as fast as possible so i can do B problem, so i have submitted it by another account but as soon as my 177shivam profile opens after some time than I submitted my own solution in my own account. Sorry for rule violation if a rule is violated and I was not familiar about this rule and now onwards it will not happen again.[user:177shivam][user:177shivam]
 » 3 months ago, # |   0 I'm sorry, but we are discussing the whole competition. There is no next time.
 » 2 months ago, # | ← Rev. 4 →   +5 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. Now it seems that i don't have access to any submissions. :(
•  » » 2 months ago, # ^ |   0 As it is written in the message: unintentional leakage is also a violation. Please, be careful in the future.
 » 2 months ago, # |   0 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.
•  » » 2 months ago, # ^ |   +10 As it is written in the message: unintentional leakage is also a violation. Please, be careful in the future.
 » 2 months ago, # | ← Rev. 2 →   0 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.
 » 2 months ago, # |   0 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.
 » 2 months ago, # | ← Rev. 2 →   -45 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
 » 2 months ago, # |   0 "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.
 » 2 months ago, # | ← Rev. 3 →   -13 "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.
 » 2 months ago, # |   0 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/41750569I will pay great attention to the use of ideone in the future. May I ask you for a favor in this round?
 » 6 weeks ago, # |   0 I am sorry I submitted from my two IDs .My one Id is cluster19999@gmail.com and other ID is bhavyarustgi10@gmail.com .I only 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.
 » 4 weeks ago, # |   0 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.
 » 4 weeks ago, # |   -8 Hi, This is regarding solution 43335491 for the problem 1058D - Vasya and Triangle , 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.
 » 4 weeks ago, # |   0 I noticed that my solution to the problem 1030B - Vasya and Cornfield was similar to someone.I just took the idea from here https://www.geeksforgeeks.org/check-whether-given-point-lies-inside-rectangle-not/, didn't copy the code exactly . Please rejudge my solution ...
 » 2 weeks ago, # |   -6 I got a message recently, regarding a coincident solution. I assure you that I have not used ideone. It might have been a coincidence since, I checked the time of submission of the other party and it was significantly different. Moreover, the code contained only a while loop.
 » 13 days ago, # | ← Rev. 7 →   0 Hello, I recieved the following Message from codeforces For My Solution 1033A : [ Attention! Your solution 43964475 for the problem 1033A significantly coincides with solutions damnstring/43954592, SadrulToaha/43964475. 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 want to clarify that i didn't share my code with anyone nor used idone and also didn't get help from anyone. i strongly believe this is a coincidence ! In this problem the solve idea is so easy and this problem can be solve in many ways such as using — many different if-else conditions .I also used if-else conditions to solve this problem .So My Solution Idea and code implementation can be match with anyone's implementation technique. I am Totally free from any Codeforces rules violation. Please Accept my solution an Give my ratings !
 » 8 days ago, # |   0 I have not any clue how our code matches I have been using ideone and saved my solution thereI will keep in mind from next timeThis time pls dont penalize me...Its a request plsFrom next time im not going to save my codeSo it will be first and last time****
 » 8 days ago, # |   0 Attention!Your solution 44150962 for the problem 1065C significantly coincides with solutions arjun_9426/44143324, spartan_go/44150962. 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 received this message I dont know how code matches I have been using ideone May be this mishappen occurs due to that only So pls dont close my account or penalize me I will keep in mind from next timeSo its a request This will be the first and last time i have been requesting Pls forgive this tym******** From next tym onwards i will not be going to save my code online on any ide
 » 8 days ago, # |   0 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.