MikeMirzayanov's blog

By MikeMirzayanov, 22 months ago, In English

Hi.

Of course, there was an unpleasant incident with the problem today. In fact, the problem almost coincided with another problem in the old round, which was hosted 5 years ago.

You, of course, are shocked. You, of course, think that the round should be unrated.

You are wrong. Here's why. We need to clearly distinguish between two scenarios with coincided problems in our rounds.

First. The writer has knowingly plagiarized. This is an outrageous scenario. Such behavior knows no excuse and it is a conscious detriment to our community. Shame on the writer!

Second. The problem was matched unintentionally. The writer was unaware of some old problem. This happens. The coordinator had not seen this old problem before or had forgotten it. We are all human. The round was tested, but the testers did not indicate such a coincidence. Too bad, it happens. Who can we blame for this situation? The writer? Most likely, the writer did a lot of work to prepare the round. What can we blame else? The coordinator? Do you really think that a coordinator should remember all 8500 problems from the archive (and, by this logic, 10,000 more from various other sources)? Show me such a person! Oh, you haven't heard of them... Maybe the testers are to blame? Or me personally?

No, all these people have put a lot of effort into preparation. You may have partially lost the buzz from solving the 2-hour round. The authors and coordinator put weeks of work into it!

Have you noticed that every Codeforces round has been tested by a much larger number of testers in recent years? Thanks to them! We put a lot of effort into it. But failures like this happen.

I insist that in such cases, no recriminations are acceptable on those who prepared the round for you.

I’m living in the world of programming competitions for more than 20 years. And I have seen the coincidence of problems, not only on the Internet rounds, but in more serious competitions. It happens. There is only one way to avoid it — do not hold competitions. Stop writing new problems.

In any other case, it will sometimes happen. If it did not happen today, it will happen tomorrow. All we can do is make some effort to prevent it.

We come up with and solve problems that revolve around a narrow set of topics. We are inspired by similar models, learning from similar educational tasks. Of course, sometimes people think alike. And this happens everywhere, whether in science, art, or any other field of knowledge.

But someone was wrong in this situation, wasn't he? I'll answer who. Those who wrote public comments of "aah! the problem is the same!" Those who rushed to write a post about it. Are you out of your mind? There were orange participants among you, and you still have no sense of the ethics of the competition? Why don't you read the terms of participation you confirmed before a round?

If a participant remembers a wide range of tasks and knows how to put them into practice, that's not a bad skill. Let a small fraction of participants be rewarded for this if such a mishap as a problem coincidence occurs. No one in their right mind would shout "let's cancel the results of the ICPC finals because there was a problem coincide". Although the price of victory and reward there is several orders of magnitude higher than another round on Codeforces.

I am strongly against the creation of such a precedent. You can't make a round unrated if unintentionally some problem coincided with some other old problem. It's a road that leads into a swamp. And we may not get out of it.

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22 months ago, # |
Rev. 2   Vote: I like it +176 Vote: I do not like it

Why don't you read the terms of participation you confirmed before a round?

Most people don't read

The registration confirms that you:

* 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.

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    22 months ago, # ^ |
    Rev. 3   Vote: I like it +16 Vote: I do not like it

    Yes.Most people don't read it,even don't read any important post.But I think It's necessary for user to know about it.How to deal with this problem?

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    22 months ago, # ^ |
      Vote: I like it +41 Vote: I do not like it

    in fact, we won't get punished if we try to copy the solutions from the old problem. cheaters will get higher marks and higher ratings. that's why it should be unrated.

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      22 months ago, # ^ |
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      even if cheater's got more rating with this round they can't sustain that position of over the period of time everything will be fine so just chill.

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        22 months ago, # ^ |
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        cheaters include those who take contest in group, and sharing information and ideas.

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      22 months ago, # ^ |
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      totally true , and with blog criterion all writers they can reuse their problem in more than one contest ,so i think it should be unrated

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    22 months ago, # ^ |
    Rev. 2   Vote: I like it +16 Vote: I do not like it

    THE TERMS ARE USELESS AT ALL IF THE CHEATERS ARE NOT PUNISHED

    Of course I know you are right , but what's police used for if a law works.

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    22 months ago, # ^ |
    Rev. 2   Vote: I like it +54 Vote: I do not like it

    This is codeforces:

    • Control comments
    • Don't care academic integrity
    • How will you seperate case 1 and 2?
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      22 months ago, # ^ |
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      22 months ago, # ^ |
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      I have liked this comment. I have nothing to do with the author. Due to my shallow knowledge, I can't judge whether the comment is bad. If so, please call me and explain the situation. After verification, I will cancel it within 15 working days and reflect deeply.

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    22 months ago, # ^ |
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    If this game is rated, it means that CF is acquiescing to large-scale cheating and low-quality questions. This will set a bad precedent for the future development of CF.

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      22 months ago, # ^ |
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      If there are many lazy questioners who directly use previous questions in the future, how should we deal with it? See them as careless?

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    22 months ago, # ^ |
      Vote: I like it +42 Vote: I do not like it

    Actually,I know this problem as same as 765F.I search on the internet,and then I find the answer. I didn't copy it because two reasons.

    (1) I'm afraid I will skip this round.

    (2) People who copy it have not got any harvest.

    Only f**king one competition cannot shows someone's power.If you strong all the time,you wont care about this because you are strong enough to make your rating higher next time.

    I hope everyone to make your rating higher next time.

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      22 months ago, # ^ |
        Vote: I like it +8 Vote: I do not like it

      In my opinion,if our goal is only to rank up, it will always be unfair for somebody whatever the result is. But we’re joining this contest to train our skills, thus coinciding problems will cause nothing: we can still learn what we want from this contest.

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    22 months ago, # ^ |
      Vote: I like it +16 Vote: I do not like it

    We can make sure we will obey the rules,but we cannot make sure others will.Anyhow,it will lead to an unfair contest.

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    22 months ago, # ^ |
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    Irrelevant. You don't have to copypaste someone else's solution to an old problem as long as you can read the editorial or even a discussion about solutions. Therefore "just don't break the rules" doesn't answer the question here.

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22 months ago, # |
  Vote: I like it +469 Vote: I do not like it

Maybe as Moscow Olympiad for Young Students it's okay, but I think it should be unrted as an online contest.

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    22 months ago, # ^ |
      Vote: I like it -155 Vote: I do not like it

    You did not read the post, did you?

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      22 months ago, # ^ |
        Vote: I like it +398 Vote: I do not like it

      The post doesn't answer the question of why this round should not be unrated.

      "But the problemsetters tried so hard" is barely an argument. Yes, they tried hard, nobody denies their work. But why would their work be invalidated as soon as their contest gets unrated is beyond me. Contest being rated only matters in first 2-3 hours, and the rest of the problem's lifespan will be spent as a problem to upsolve, where it doesn't matter if the contest was rated or not.

      Mike wrote a big "nothing" burger of a post, which was basically "well coincidences aren't bad, so the round is not unrated". No shit sherlock, nobody blames coincidences, but 1) People got an unfair advantage due to comments about 765F, and then it spread everywhere, because people thought it will be unrated anyway and 2) people who didn't know about 765F got severely fucked over, and therefore they had a unsatisfying time solving the contest.

      I am not a problemsetter, but if I was, my main priority would be "Most people should have a pleasant experience with my contest/my problems". And, personally(absolutely doesn't mean authors of 852 should do), I would ask for round being unrated myself, because that would satisfy most people, and make it so people who "played fair" didn't regret about this decision.

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        22 months ago, # ^ |
          Vote: I like it +143 Vote: I do not like it

        Mike only considered the feelings of the problem setters but he didn't care for the feelings of the participants.

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          22 months ago, # ^ |
            Vote: I like it -68 Vote: I do not like it

          Talk on your behalf not all participants

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            22 months ago, # ^ |
              Vote: I like it +17 Vote: I do not like it

            in fact I didn't take part in this round at all. I only think this is unfair for those who didn't know F coincided with CF765F.

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          22 months ago, # ^ |
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          Why should Mike consider the feeling of the shameless cheaters?!

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            22 months ago, # ^ |
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            I did not refer to the shameless cheaters. I only think this is unfair for those who didn't know F coincided with CF765F.

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        22 months ago, # ^ |
          Vote: I like it +33 Vote: I do not like it

        1) where do you draw the line?

        if the solutions are exactly the same? if the thinking processes are exactly the same? if the general data structures used are exactly the same?

        Why did you decide to draw the line there? Why should others not draw the line differently? Mike rightly said its a bad precedent

        2) Experience gives the ability to recognize what data structures/algorithms/general ideas will likely be used to solve the problem, the only unfortunate part in today's problem is it gives the whole solution instead. Why exactly is the first one alright, but the second one such a big problem.

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          22 months ago, # ^ |
          Rev. 3   Vote: I like it -17 Vote: I do not like it
          1) where do you draw the line?
          

          By having a look at the recent codeforces rounds that got unrated, it was due to the exact overlap with known problems from the previous contest. Meanwhile, if you look at almost all contests, the problems may use the part from other known problems, but the overall idea is still original. But these contests are still rated. So, the threshold is still pretty clear for whether the contest will be rated or not. The today's contest shares the exact problem from previous contest so ideally it should get unrated as the trend suggests. I have not given the round.

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            22 months ago, # ^ |
              Vote: I like it +52 Vote: I do not like it

            You're wrong.

            Recent rounds that were unrated due to things like this were unrated due to plagiarism. Even the tests were the same, as the "author" didn't even bother to change the tests.

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              22 months ago, # ^ |
              Rev. 4   Vote: I like it -14 Vote: I do not like it

              I think in this case the round getting unrated have no correlation with author's hardwork. The round should be unrated as it will be unfair to good number of participants. At the same time, author's hard work will be respected as the problem will be the part of archive. Yes, you are right that in previous round, the authors deliberately attempted to copy the problem which may not be the case in today's round. But the decision to make the round unrated was taken by keeping in mind the fact that it was unfair to most participants. Have those copied problem were not identified by anyone. Do you still think the round had gotten unrated? Also, I guess in previous such rounds, the concerned authors were punished by not allowing to make problems again (I may not be right here).

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                22 months ago, # ^ |
                  Vote: I like it +73 Vote: I do not like it

                I agree with your first sentence, as in my opinion authors should be free to use past problems as long as they give credit to their "inspiration" and the original problems weren't too recent.

                In fact, such things have already happened when people used papers as source for round problems. I see no harm in that.

                I do see harm in contestants jumping into the announcement comment section and saying which problem is the similar to it. I think such people should be banned.

                And to be clear, people that went to the announcement comment section and copied the solution did nothing bad and shouldn't be banned.

                I think that either the round or just the problem should be unrated if this happened.

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                  22 months ago, # ^ |
                  Rev. 2   Vote: I like it +1 Vote: I do not like it

                  the problem is this task is so classic that many people had solved it before, and there even has been a couple of problems based on it.

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                  22 months ago, # ^ |
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                  I agree. Now that I've looked at the problem I also recognize it as a problem that I've revisited around 5 times in these last few years. It's an imporatant problem for me because it taught me that log might be removed in mo's algorithm by using linked lists sometimes.

                  As a tester I would've instantly recognized the problem. I still think such things shouldn't be a problem for div2 as it's been 5 years or so since the problem appeared and people in div2 most likely don't know the original problem unless people spread that information during the contest.

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                  22 months ago, # ^ |
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                  Could you describe how you would go about removing the log factor in mo's algorithm for that problem? I don't really see how you could do that with linked lists (probably because I never really used them). Thanks.

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    22 months ago, # ^ |
      Vote: I like it -125 Vote: I do not like it

    Seriously, did you read the blog?

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    22 months ago, # ^ |
    Rev. 4   Vote: I like it -61 Vote: I do not like it

    nobody wants an unfair round. btw which problem was copied?

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    22 months ago, # ^ |
      Vote: I like it +196 Vote: I do not like it

    Yeah, no one should be blamed, but the round is unfair finally; no one is responsible, but it happened. So what, we just sit?

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      22 months ago, # ^ |
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      No matter it is unintentionally or not, the result is the same, isn't it?

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      22 months ago, # ^ |
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      your English is so Chinglish,a little bit funny.like "we just sit"

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        22 months ago, # ^ |
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        So? It's enough to talk.

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        22 months ago, # ^ |
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        Totally opposite to you, I think "just sit" sounds like a phrase used by a native speaker.

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22 months ago, # |
  Vote: I like it +261 Vote: I do not like it

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22 months ago, # |
  Vote: I like it +219 Vote: I do not like it

You need to play Genshin Impact.

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    22 months ago, # ^ |
      Vote: I like it +51 Vote: I do not like it

    Then everything is reasonable.

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    22 months ago, # ^ |
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    woc op

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    22 months ago, # ^ |
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    Enough, leave it I can't believe such things of no importance also lead to criticism of Genshin Impact. Firstly, Genshin has never irritated you; secondly, it has never done anything intolerable, so what is wrong with you that you keep discrediting Genshin mindlessly? Mihoyo is dedicated to cultural exportation and Chinese propagation, however maniacs like you know nothing but tapping keyboards online, calumniating our great company of conscience. The bright future of Chinese indigenous electronic games will definitely be devastated by people like you.

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    22 months ago, # ^ |
      Vote: I like it +21 Vote: I do not like it

    Why there is Genshin Impact everywhere.

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      22 months ago, # ^ |
      Rev. 2   Vote: I like it +10 Vote: I do not like it

      Because of the original problem CF765F(?)

      upd: not.

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    22 months ago, # ^ |
      Vote: I like it +134 Vote: I do not like it

    You are right, but Genshin Impact is a new open world adventure game independently developed by miHoYo. The game takes place in a fantasy world called "Tivat", where the person selected by God will be granted the "Eye of God" to guide the power of elements. You will play a mysterious role called "Traveler". You will encounter companions with different personalities and unique abilities in your free travel, defeat powerful enemies with them, and find lost relatives — at the same time, gradually discover the truth of "Genshin Impact". Because of your poor quality, I can earn 150 yuan every day when I play Genshin Impact every day. My monthly income is about 5000 yuan, that is, the income level of 5000 dollars in real life every month, which translates to at least 30000 yuan. Although I am only 14 years old, I have exceeded the level of most people in China (including you). This is the proud capital Genshin Impact has given me. It is no exaggeration to say that "Genshin Impact" is the most ambitious work of miHo Yo so far. Even after 8700 hours of hard fighting, the game still has many undiscovered secrets, missed weapons and equipment, and never used spells and skills. Although the combat experience in the game is not much different from what we have seen in the previous series of games, all kinds of carefully designed enemies and Boss battles in the game have raised the fight to a new level. Just like the Legend of Zelda a few years ago, Genshin Impact is an excellent work that can promote the development of similar games.

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    22 months ago, # ^ |
      Vote: I like it +70 Vote: I do not like it

    □□□□,□□《□□》□□□□□□□□□□□□□□□□□□□□□□□□。□□□□□□□□□□「□□□」□□□□□,□□□,□□□□□□□□□□「□□□」,□□□□□□。□□□□□□□□「□□□」□□□□□,□□□□□□□□□□□□□、□□□□□□□□,□□□□□□□□□,□□□□□□□——□□,□□□□「□□」□□□

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      22 months ago, # ^ |
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      such wise words have never been said before

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    22 months ago, # ^ |
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    deleted

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    22 months ago, # ^ |
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    You're right, the clothes and bag are new for you.

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    22 months ago, # ^ |
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    lol, what's the deal with all these Genshin jokes?

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      22 months ago, # ^ |
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      Some stupid Genshin Impact players do disgusting things on Internet,so many people curse them,then the players curse back with stupid words.Many people think these words funny,so make them jokes.

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        22 months ago, # ^ |
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        oh, so CF765F is some sort of curse word?

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          22 months ago, # ^ |
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          No,it's just the origin problem.

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    22 months ago, # ^ |
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    Beware that Chinese memes invade Codeforces

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    22 months ago, # ^ |
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    True dude

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    22 months ago, # ^ |
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    You are right, but now I can earn 150 rough stones every day playing Genshin Impact, which is about 5,000 rough stones a month, which is the income level of 5,000 US dollars per month in real life. In conversion, it is at least 30,000 yuan, although I I am only 14 years old, but I have surpassed the level of most people in the world (including you). This is the proud capital that Genshin Impact gave me.

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22 months ago, # |
Rev. 4   Vote: I like it +124 Vote: I do not like it

Yeah, as a problem author for other contests, this is one of my biggest nightmares. I try hard to make sure I'm not using a problem that has existed before, but I know I haven't seen everything. Especially when you write simple and easy to understand statements, it's really scary it might happen.

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    22 months ago, # ^ |
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    and you do not care that it could affect the rating of other participants

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    22 months ago, # ^ |
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    Yeah. I think most rational people can understand you. Coincidences can't be avoided somehow. So I think those who use rude words to blame any of the contributor are irrational and babyish. The only who should be blamed are those who copied the code and broke the balance of the competition. If we can find a way to punish those plagiarists, then everyone can get a good result. But it's hard to figure out those participators.

    The reason why so many players (including me) want to unrate this competition is that those plagiarists did break the balance of the competition and make many players suffered undue losses.(I need to say it's not an excuse for some of the weak players) We know that unrating a problem is a great setback for the authors, but the consequences we face will be heavier than not unrating the contest(not only for some rating but for the whole environment in Codeforces).

    I don't think it's fair for you authors, but as it's a coincidence, like a great rain breaks the flowers in your yard, you do nothing wrong but it's finally unfair to you. We are all sad about the result, and we can only pray that this unfortunate thing will not happen again.

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22 months ago, # |
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So why not clarify it in the contest in time?

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    22 months ago, # ^ |
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    You don't want to draw attention to the fact that there's an answer on the internet somewhere. Everyone would stop thinking and start googling, exacerbating the problem.

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    22 months ago, # ^ |
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    Well, we need the rules about unrated.

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22 months ago, # |
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How about removing problem F from the round, instead of making it unrated. I know neither of the decisions are good for the people who invested their time in it.

But, I feel the former is better considering most of the people who solved F, were unrated participants (or could possibly have the potential to get into div1 easily).

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    22 months ago, # ^ |
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    positive solution

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    22 months ago, # ^ |
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    Removing the problem and keeping the contest rated is the worst decision IMO. As you said, some people may have invested their time in it. Maybe even chose it over some other problem to gain more points and eventually solved it from scratch. But let's just remove it. Awesome!

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      22 months ago, # ^ |
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      Those who can solve a 3100 rated problem from scratch in a div2 contest, can easily gain ratings in another div2 round imo. That's what I meant in my last line.

      Also, by removing the problem I meant to remove it from the contest only, and not from the cf problem-set.

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        22 months ago, # ^ |
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        Those who can solve a 3000-rated problem from scratch in a div2 contest, can easily gain ratings in another div2 round imo.
        It's still nonsense to those people. Even if there's only one. Either keep it rated as stated in the post (at least you are not taken away the problem that you fairly solved). Or make it unrated (unrated contests happen from time to time).

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    22 months ago, # ^ |
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    there are a few people who solved it without copying solution, imagine solving F after an hour long toil and then you get put back with the abc or abcd solvers

    (somebody wrote what i wanted to just 2 mins before me)

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    22 months ago, # ^ |
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    It's unfair for the group of people who didn't know the problem but invested time on solving it.

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22 months ago, # |
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Does unrating a round effect the author's feelings more than the discontent of the participants affected? Can a round, and the authors' hardwork, not be appreciated independent of the round being rated or not?

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    22 months ago, # ^ |
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    I think the then the problem setters will feel(subconsciously) that they just created a gym contest

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22 months ago, # |
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I left the round without solving a problem thinking it will be unrated. :)

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    22 months ago, # ^ |
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    what else ?

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    22 months ago, # ^ |
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    You shouldn't enter the contest only because of rating. What is this "No rating? I will leave the contest then"? Be mature. People should enter codeforces contests because it is good preparation for the actual contests, it is fun and it helps you improve your coding skills. And the rating is just the tool to see your level.

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22 months ago, # |
  Vote: I like it +4 Vote: I do not like it

Will the submissions that totally copied from 765F be skipped?

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    »
    22 months ago, # ^ |
      Vote: I like it +24 Vote: I do not like it

    No, since it is allowed to copy code that exists freely on the internet before the round starts.

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22 months ago, # |
  Vote: I like it -37 Vote: I do not like it

Perfectly said by Mike sir. Some who don't know about that question has put millions of effort to get it right for rating increment. It is unfair to make it as unrated one

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    »
    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    But it's also unfair to those who put effort in this rating if it's rated.They have a lower rank than they should be because of cheaters.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I agree with the post. I respect everyone contributing to the conduction of contests and understand the effort that goes into the process. Despite having performed poorly today, I found the problems to be quite interesting and had fun! A negative delta will just work to remind me of the shortcomings I had :)

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    »
    22 months ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    You will climb back. I can tell bc you're a HIMSAGI fan.

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22 months ago, # |
Rev. 2   Vote: I like it -35 Vote: I do not like it

I think you are Wrong(Originally,there is a rude word,I update it)

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22 months ago, # |
  Vote: I like it +18 Vote: I do not like it

We have wronged you, zxyoi.

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    »
    22 months ago, # ^ |
      Vote: I like it +33 Vote: I do not like it

    I remember he did it on purpose.

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      »
      »
      22 months ago, # ^ |
        Vote: I like it +4 Vote: I do not like it

      Maybe it's because he's forced to admit it, lmao... Anyway, he did it on purpose but this contest is just an accident. However that doesn't change how its looks for most participants: they can just easily copy-paste code and get AC, and it's even easier to find the solution for this problem.

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22 months ago, # |
  Vote: I like it +174 Vote: I do not like it

We should be grateful for all the problemsetters, even though sometimes the problems are not that perfect. But think of that: Will you make a round unrated if thousands of people cheated together in the round, I think the answer is yes, because the innocent participants' ratings would get affected otherwise. And so is it in this round, many people didn't read the terms of participation, true, resulting in a similar scenario. We want a round go unrated doesn't mean that we don't like the round at all, maybe one problem makes the round unfair, but we still enjoyed rest and we respect the problem providers. However, even if it's not intentional for the problem to be original, the round should be unrated right?

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22 months ago, # |
  Vote: I like it +58 Vote: I do not like it

Subjectively, the author did not intentionally repeat the question, but objectively, the repeated question did affect the fairness of the competition. I think the best way to deal with it is to let the competition unrated, and the person who made the question should be treated as making a small mistake.

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22 months ago, # |
  Vote: I like it +53 Vote: I do not like it

I think whether or not the problem writer is intended, this round is unfair for most of the participants. What about Skipped this problem? F is a really hard problem. I think at most 10 people can solve them. But now we have 100+.

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22 months ago, # |
  Vote: I like it +83 Vote: I do not like it

sb

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22 months ago, # |
  Vote: I like it +29 Vote: I do not like it

I still think it should be unrated.

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

I think everyone who copied the problem F code should be skipped.

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22 months ago, # |
  Vote: I like it +44 Vote: I do not like it

So what will you do for plagiarists? Nothing and rating as usual?

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22 months ago, # |
  Vote: I like it +72 Vote: I do not like it

zxyoi if you didn't admit then it will be alright lol

thats funny

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22 months ago, # |
  Vote: I like it +70 Vote: I do not like it

I don't think that whether the competition is rated or not is necessarily relevant to the feelings of those who prepared questions for the competition.

But definitely, those who participated in the competition are affected and their experiences in participating are clearly ruined. This should be the focus.

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22 months ago, # |
  Vote: I like it -18 Vote: I do not like it

I think nmsl

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Which problem was this about?

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22 months ago, # |
  Vote: I like it +44 Vote: I do not like it

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22 months ago, # |
  Vote: I like it +32 Vote: I do not like it

Because of Codeforces Rounds are online, so we can copy the code from the Internet very quickly.

That mean, if you didn't know this problem before, you will get fewer points than people don't know how to solve but copy the code. It makes the contest unfair.

  • »
    »
    22 months ago, # ^ |
      Vote: I like it +33 Vote: I do not like it

    Disagree. If the problem has the similar(same?) trick as another problem, do you feel unfair?

    • »
      »
      »
      22 months ago, # ^ |
        Vote: I like it +19 Vote: I do not like it

      I mean the problems like F that are well-known and can pass by copying the code from the Internet and make small(even no!) change.

      My English is poor :(

  • »
    »
    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Also a bigger problem in my opinion is someone wrote a blog on it and even greys copied the code for that question and solved F.

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22 months ago, # |
Rev. 2   Vote: I like it +115 Vote: I do not like it

if(predicted_delta < 0) cout << "I think it should be unrated.";

else cout << "I think it should be rated.";

  • »
    »
    22 months ago, # ^ |
      Vote: I like it +23 Vote: I do not like it

    Rational, pertinent and objective

  • »
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    22 months ago, # ^ |
    Rev. 3   Vote: I like it -23 Vote: I do not like it

    deleted

  • »
    »
    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    My predicted delta = 38,but I think it should be unrated.

  • »
    »
    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    seriously?

    • »
      »
      »
      22 months ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      Yes.I solved ABCD and I didn't solved F.But I think it should be unrated because of a duplicate problem——it caused the contest unfair.

      • »
        »
        »
        »
        22 months ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        I agree with you.

        I was replying to tn757

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          »
          »
          »
          »
          22 months ago, # ^ |
            Vote: I like it 0 Vote: I do not like it

          Oh,I didn't know it.Sorry about that

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22 months ago, # |
  Vote: I like it +7 Vote: I do not like it

I think it is acceptable to unrated but the F should be removed, because there are so many copies :(

  • »
    »
    22 months ago, # ^ |
      Vote: I like it +5 Vote: I do not like it

    +1. I think deleting problem F will provide justice.

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22 months ago, # |
  Vote: I like it +88 Vote: I do not like it

I was completely surprised by you,Mike.

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

This game rating is not fair to the players.

But problem f is not just similar to the past problem, it is exactly the same. Also, since question f was the original question, not everyone participated seriously in this competition.

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22 months ago, # |
  Vote: I like it +5 Vote: I do not like it

Next time, copy the problem and say you are unaware.

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22 months ago, # |
  Vote: I like it +135 Vote: I do not like it

Shouldn't we make a clear rule for these situation? I see some contests became unrated but some were still rated when someone found the same problem.

  • »
    »
    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Correct, direct, pertinent, elegant, objective, complete, three-dimensional, comprehensive, dialectical, metaphysical, appreciative of both refined and popular, point-blank, and direct.

    • »
      »
      »
      22 months ago, # ^ |
        Vote: I like it +11 Vote: I do not like it

      There are two "direct" in your words.

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    22 months ago, # ^ |
      Vote: I like it +15 Vote: I do not like it

    I think the blog outlined a clear rule pretty directly.

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      »
      22 months ago, # ^ |
        Vote: I like it +16 Vote: I do not like it

      basically the rule depends on the writer comfirmed what he did. since the difficulty to reach yellow is becoming lower and lower(especially by cheating), i believe that some guys will break the rule one day.

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      »
      »
      22 months ago, # ^ |
        Vote: I like it +21 Vote: I do not like it

      But how can we judge whether the author deliberately or accidentally set a question appeared before.

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22 months ago, # |
  Vote: I like it +11 Vote: I do not like it

I agree not to unrated the whole contest,however it will be ridiculous not to remove the problem after awared of the coincidence.

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22 months ago, # |
  Vote: I like it -63 Vote: I do not like it

You are right,but Genshin is an open world adventure game produced and published by Shanghai Mihayou Network Technology Co., Ltd. The game takes place in a fantasy world called "Tivat". Here, those chosen by the gods will be granted the "eye of the gods", channeling the power of the elements. Players will play a mysterious character named "Traveler", meet companions with different personalities and unique abilities in free travel, defeat powerful enemies together with them, and find lost relatives — at the same time, gradually discover " Genshin " truth.

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22 months ago, # |
  Vote: I like it +10 Vote: I do not like it

about 200 people just Copied the editorial and got AC,it's not fair to make the round be rated.

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    »
    22 months ago, # ^ |
      Vote: I like it +7 Vote: I do not like it

    Can we just remove problem F from consideration?

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    »
    22 months ago, # ^ |
    Rev. 2   Vote: I like it +5 Vote: I do not like it

    I also could see someone who only get accepted in the problem A,B,F.And they got higher score than me XD

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22 months ago, # |
  Vote: I like it -34 Vote: I do not like it

Don't unrated please! I get the highest score that I have ever got in this contest and can absolutely get 1600+ which I have been long for. It will be so depressing if unrated.

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    »
    22 months ago, # ^ |
      Vote: I like it -10 Vote: I do not like it

    so it's better to delete F xd

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    22 months ago, # ^ |
    Rev. 2   Vote: I like it +9 Vote: I do not like it

    Yes I can understand you because I already experienced it but the fact is the round should be unrated because the F breaks the fairness of the round.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

It would be cool to have some kind of automated system which would check problems with the same input/output formats and check if there is a match. Not sure how much work will it be to implement and how many cases will it be able to prevent but it's an interesting idea.

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22 months ago, # |
  Vote: I like it +15 Vote: I do not like it

I think copying and coincidence are two different things -- totally different. We have already many problems covering various topics and tricks, it's common to find a similar problem with yours, so I support still rated this round.

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22 months ago, # |
  Vote: I like it +130 Vote: I do not like it

I agree with this post, but I also want to point out that the comments in the announcement blog pointing to the copy of Problem F were up for atleast 25 minutes.

For sure, those who commented violated the terms of competition. But the admins should have been prompter in removing those comments. You just took unacceptably too long to delete the comment. A non-trivial fraction of the people who solved F were not from memory, but from the comment that you are talking about.

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22 months ago, # |
  Vote: I like it -7 Vote: I do not like it

Yes, but CodeForces is a great platform to practise coding and have good contests.

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22 months ago, # |
  Vote: I like it +18 Vote: I do not like it

I agree that we cannot blame the authors and testers for this. However, it would be one thing if only the people who actually remember this problem solved it: I doubt the solve count would be much different. In this case, though, many people solved this problem because they found out about it from the people who posted comments during the round. I do not see how this differs from mass cheating, and I think it is a good reason for this round to be unrated.

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22 months ago, # |
Rev. 3   Vote: I like it -43 Vote: I do not like it

To the author of the contest:

I think you are irresponsible about the contest.

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22 months ago, # |
  Vote: I like it -26 Vote: I do not like it

Here are some good games you should play: 1. Genshin impact 2. Arknight 3. 三国杀 4. 王者荣耀 5. Minicraft

If you admit you are an OP , our genshin impact players will put you in a good word.

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22 months ago, # |
  Vote: I like it +11 Vote: I do not like it

sb

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22 months ago, # |
  Vote: I like it +40 Vote: I do not like it

No one wants the round to be unrated (directly) because the authors make a same problem, and everyone understand making a same problem is sometimes hard to avoid; we want the round to be unrated to avoid unfair between participants who already knows the same problem and can copy a code and who doesn't.

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

It is unfair.

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22 months ago, # |
  Vote: I like it -22 Vote: I do not like it

you must be a genshin plaer.

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22 months ago, # |
  Vote: I like it +10 Vote: I do not like it

upvote zxyoi god pls

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22 months ago, # |
  Vote: I like it +59 Vote: I do not like it

Hello Mike, thank you and your platform for all the great contests. I have taken more than 100 contests up to now.

I agree that all the problem-preparers' efforts should be respected and I don't think the problem-preparers copy the problem F on purpose. I am grateful for their nice problem E.

However, why we contestants want it to be unrated is not that we dislike the authors and deny their efforts; it's that too many people get their rank and rating by copying codes online, and too many innocent contestants lose their rating, just because no one tell them there is a same problem in codeforces or that they feel guilty to copy a code.

In ICPC contest, even if there is any same problems, no one has access to the Internet, so only those who really master the problem can solve it. I think it's fair.

But in codeforces, maybe someone didn't solve the problem before, just because his friends tell him here is the code and he solves it through this way. Don't you think he doesn't deserve the rating?

All in all, I respect all the problem-preparers, but I think the round should be unrated.

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22 months ago, # |
  Vote: I like it +21 Vote: I do not like it

I don't think so.

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22 months ago, # |
  Vote: I like it +17 Vote: I do not like it

We won't blame the writers.But I think it isn't fair to be rated while sb. use history code even others'.
我们不会责备出题人。但是我认为当有人使用历史代码,甚至是别人的历史代码提交答案时还要rated是不公平的。

  • »
    »
    22 months ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    No, this is within the rules. The rules said that you can use code that is published before contest. Other peoples' code are published before contest.

    • »
      »
      »
      22 months ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      I think lots of users think this contest will be unrated,so they didn't use the code before.How can it be fair?
      我认为很多用户因为认为这次比赛将会unrated所以并没有使用之前的代码。这也是公平的

      吗?

      • »
        »
        »
        »
        22 months ago, # ^ |
        Rev. 3   Vote: I like it +14 Vote: I do not like it

        so make it unrated lol

        Nothing with the authors, I trust them and this does not look deliberate. The money or something for the authors should be kept or maybe even more than kept for compensation or something, they made a huge effort, I saw it from the problems and appreciated it. But this is an online contest.

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          »
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          22 months ago, # ^ |
            Vote: I like it 0 Vote: I do not like it

          Yes,I agree.I just think it won't be fair to be rated.If they still want to rated,I just want to say:"addd,you are right,you are right all the time."
          是的,我赞同。我只是认为rated是不公平的。如果他们还要rated,我只能说:“啊对对对,你说的对,你说的都对”(乐

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22 months ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Mike, you are right here but just think many of the participants thought that round will be unrated (because in the past because of coincidence in problem rounds turned to unrated) and rushed round or left round in between what about them? They will get a high negative delta after it, is it fair for them?

The author did great I personally liked problems D and E (didn't solve them during the round).

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22 months ago, # |
  Vote: I like it +13 Vote: I do not like it

You need to play Genshin Impact.

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22 months ago, # |
  Vote: I like it +5 Vote: I do not like it

It is not a punishment to the author to make the round unrated. It is not their fault if the coincidence was unintentional. But the round should still be unrated because a select number of people solved a problem highly above their rating because they were lucky enough to see a comment linking to the solution.

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22 months ago, # |
  Vote: I like it +1 Vote: I do not like it

□□□□,□□《□□》□□□□□□□□□□□□□□□□□□□□□□□□。□□□□□□□□□□「□□□」□□□□□,□□□,□□□□□□□□□□「□□□」,□□□□□□。□□□□□□□□「□□□」□□□□□,□□□□□□□□□□□□□、□□□□□□□□,□□□□□□□□□,□□□□□□□——□□,□□□□「□□」□□□

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22 months ago, # |
  Vote: I like it +29 Vote: I do not like it

If the round is rated, will F affect its fairness?

Even if the score of F is removed, won't there be someone who has less time to finish the other problems because of F?

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22 months ago, # |
  Vote: I like it +15 Vote: I do not like it

I think it's totally different from ICPC contests. In CF, we can easily find the problem it is the same as. So, in order to get higher marks, we'd better go to look for the old problem instead of solve the problem, if we hadn't seen it. In fact, it is encouraging participants to cheat. I don't think it's fair. Obviously, we have no way to do similar things in ICPC.

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22 months ago, # |
  Vote: I like it +37 Vote: I do not like it

Can I always put on a well-known problem and say "I didn't mean to do it" ?

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22 months ago, # |
Rev. 2   Vote: I like it +46 Vote: I do not like it

I. There's something called tags, which gives us a reasonable number of problems to check.

II. No one should take the blame. The probabilty takes. How does someone hit by lightning do something wrong?

III. Consider the participants. Why don't you? There must be a lot of people who had a hard time getting a chance to participate in a Codeforces contest. But with the third-party code rule, they have a bad experience on Codeforces. What would people think of Codeforces?

Yeah, downvote me, ban me quickly. I am just in a mood to shitpost.

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22 months ago, # |
  Vote: I like it +24 Vote: I do not like it

I trust the ethics of contest authors, that they didn't do it on purpose. But hundreds of people just finding out the original problem and submit the copied code to get "Pretest Passed". This is very unfair to any other comply with "terms of participation". So I think we should "skip" the cheaters to keep the contest fair. I can't accept the contest rated with these cheaters that copied F.

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    22 months ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    If a code is copied by many people, the person who copied it first will be rated?

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22 months ago, # |
Rev. 6   Vote: I like it -29 Vote: I do not like it

Duh. This is stupid, I downvoted myself using my alt

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    »
    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Codeforces is still the largest and probably best OJ in the world now

    so what's your opinion on cf contests (?)

    • »
      »
      »
      22 months ago, # ^ |
      Rev. 3   Vote: I like it -10 Vote: I do not like it

      The chinese part is mozheng. the above is real. sorry for confusion

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22 months ago, # |
  Vote: I like it -34 Vote: I do not like it

Shame on u and cf round.

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22 months ago, # |
  Vote: I like it +53 Vote: I do not like it

I have an idea — Make this round unrated. In the future, ban users from creating blogposts / comments during rounds.

The Codeforces community must not make this mistake twice, and disabling blogposts / comments during rounds relegates such unfairness to the shadow realm (aka cheating servers).

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    22 months ago, # ^ |
      Vote: I like it +6 Vote: I do not like it

    Good one. Maybe make a simplistic UI for the current contest like m1.codeforces.com or something, and block everything else. Personally I find the lightweight website setups comfortable during contest.

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    22 months ago, # ^ |
      Vote: I like it +11 Vote: I do not like it

    Do you know QQ?

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22 months ago, # |
  Vote: I like it +11 Vote: I do not like it

AGC061 is on.

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22 months ago, # |
Rev. 4   Vote: I like it -20 Vote: I do not like it

delete

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22 months ago, # |
  Vote: I like it +5 Vote: I do not like it

So how will the plagiarism check be done for this round? Many who passed problem F simply searched for "CF765F" on the internet and got a piece of passing code, so how many of them do we skip? Or maybe not at all?

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22 months ago, # |
Rev. 3   Vote: I like it -6 Vote: I do not like it

If a lower problem would have been copied (like D or C), would this discussion still take place? The round would have immediately become unrated, a lot more people would have been affected by this problem. In today's round, there were fewer (but still many) people affected, but the situation still remains unfair nonetheless, and making it unrated (or removing F from the standings) is the more sensible option.

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22 months ago, # |
Rev. 2   Vote: I like it +31 Vote: I do not like it

I'm so happy COZ I didn't take part in this competition

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22 months ago, # |
  Vote: I like it +10 Vote: I do not like it

There exist a problem is that how can we know if a problem was matched unintentionally or not.If I just read the statement of the old problem and prepare "my problem" by myself,it's hard to find strong evidence to proof I did it on purpose.

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22 months ago, # |
  Vote: I like it -28 Vote: I do not like it

No one should be blamed ,but it's unfair if it's rated. Mike Never Mind the Scandal and Liber❤. And I advice you to play Genshin Impact:)

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Another question:why someone search for F

  • »
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    22 months ago, # ^ |
      Vote: I like it +28 Vote: I do not like it

    Maybe someone remember it and don't need searching. After all the problem statement is equivalent to one short sentence "Query the maximum of difference in some interval". It's easy to remember it if you have solved some similar problem.

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22 months ago, # |
Rev. 2   Vote: I like it +30 Vote: I do not like it

I also agree that the contest should be rated, especially because this was a div 2 contest and there were only 250 solves of F. The main groups of people who are affected are:

  1. the people who found F online and resubmitted who will get a large positive delta.

  2. those who finished A-D quickly and attempted to solve F instead of E, which may be easier. Or those who solved E and now are ranked way below where they should be. These people likely get a positive delta anyway.

  3. people who did not solve A-D quickly, who are unlikely to solve anything higher than D. these people will get a slightly more negative delta on average since there are F solves that shouldn't be there.

One potential middle ground would be to calculate the ratings twice: including problem F and excluding F, and then giving people the higher of the rating deltas. This would benefit groups 2 and 3, while leaving group 1 the same. I'm curious how much rating inflation that would cause. If the avg. rating increase per participant is not too high, it seems reasonable. Or maybe that's too much work, which is also reasonable.

Note that I am biased, since I was in group 2, which is the group that benefits the most from such a change :P

In reality though, rating is just a trailing indicator of skill, so it shouldn't be a big deal no matter what. Thank you for the contest and the great platform!

  • »
    »
    22 months ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    Is 250 a small number for Div2 F? I solved E and I think it not a hard problem,however there's less than 50 correct submission to E.

    • »
      »
      »
      22 months ago, # ^ |
      Rev. 2   Vote: I like it 0 Vote: I do not like it

      Oh sorry, i didn't mean it's a small number of people compared to how many should have solved it. I just meant compared to the number of people who took the contest (~2.5% of the rated participants). People that are outside the top 10% won't have their rating affected toooo much, and people in the top 10% are more likely to have a positive delta.

      To me, the main argument for unrating the contest is to make sure those in group 1 above don't benefit unfairly. But if they performed way above their skill because of it, their rating will just go back down in a future contest, so it's not a big deal to me.

  • »
    »
    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    this is actually a underrated good suggestion

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22 months ago, # |
Rev. 2   Vote: I like it +18 Vote: I do not like it

I wonder... do the writters really write their problems to 'rate' people? But I believe participants are here for a clear, fair, and 'rated' round. (If not, why are they participating on-time? They could just solve archives/virtual)

I cant really see the downside of unrating the round. Even though unrated rounds makes me weary and empty, I'd prefer fair rounds and points.

+) I do understand that coordinators/staffs may feel pissed. Thank you for such a great platform

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22 months ago, # |
Rev. 2   Vote: I like it +14 Vote: I do not like it

3000+ score is just determined by whether you checked the comments early — is it fair?

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22 months ago, # |
  Vote: I like it +19 Vote: I do not like it

I don't think that the authors, the coordinators or the testers should be to blame. But, many contestants have seen or solven the old problem. They can just copy the code they wrote before, or even just copy someone else's code to get the points. It's of course very unfair. The old problem is well-known, and I thought that such a amount of contestants who get the chance to copy code is a problem big enough.

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22 months ago, # |
  Vote: I like it +5 Vote: I do not like it

i wish unrated (because i will -100 after this contest). But I believe Mike's decision is right. Moreover, codeforces has provided so many great questions and I learned a lot in it. whether it rated doesn't matter.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Was it intentional or careless? I kept part of the original question, you know you're participating in codeforce.

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22 months ago, # |
  Vote: I like it +44 Vote: I do not like it

I removed most of the original questions, but kept some of them, because I think it can let you know that this is codeforces.

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22 months ago, # |
  Vote: I like it +450 Vote: I do not like it

No, you are wrong about this.

  1. The authors and coordinator made this mistake unintentionally, and they are certainly not guilty. But still, they need to bare responsibility, including making the contest unrated. Their tremendous efforts do not offset their responsibility.
  2. Making the contest unrated doesn’t mean that we don’t appreciate the authors and coordinator. Even if there is a problem that is bad or even is identical to some previous problem, it does not mean that we cannot enjoy the other problems and gain knowledge and progress. But the objective unfairness of the contest itself must be controlled, independently of the author's and coordinator's contribution.
  3. It’s not appropriate to compare Codeforces online contests with ICPC finals: the rules (allowing to use third-party code) and the freedom (uncontrolled communication between participants) of the online contests dictate that if an inappropriate problem appears, the impact will be greater; whereas in an official competition with controlled communication, it will only benefit teams that already have a knowledge base of their own (which is instead reasonable, for example, it is normal to have problems with similar models). On the other hand, it is precisely the greater price of victory and reward that leads to caution in making critical decisions in official contests, whereas online contests do not need to worry about this.
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    22 months ago, # ^ |
      Vote: I like it +18 Vote: I do not like it

    I didn't write that recognizing a round as non-rated is equivalent to admitting the authors' guilt. I warned that the authors and coordinators cannot be blamed for what happened. I've erased some very nasty comments and wouldn't want that tone to become the norm.

    Of course, the situation affects the standings. My idea is that such a coincidence is a probabilistic process and over time, problems only accumulate and this probability grows. And we have to live with it, we cannot rule out the possibility of this. We need to somehow fight, try to prevent, but move forward. And the use of the rule: the problem coincided, so the round is unrated is not a solution.

    It's like about cheaters. I clean out hundreds of dishonest contestants every round. And, of course, these numbers are growing. Let's make the round non-ranking as soon as someone publishes their solutions in the next stupid telegram channel? It's like accepting the conditions of a terrorist, knowing that he will repeat his actions again and again.

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      22 months ago, # ^ |
        Vote: I like it -54 Vote: I do not like it

      I think it may be a solution if you update the rules and add the limit of problem coincidence into it. For example, you can decide that if there is only one bad problem, the bad problem is not so famous, or the problem is from a contest that was hold a long time ago, then there won't be a unr.

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      22 months ago, # ^ |
        Vote: I like it +20 Vote: I do not like it

      It is not like about cheaters. Cleaning out cheaters can restore the fairness of the contest, but cleaning out coincident problems can not, so we should make the contest unrated. If cleaning out cheaters is a solution, making contests unrated should be one too.

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      22 months ago, # ^ |
      Rev. 2   Vote: I like it +69 Vote: I do not like it

      I understood what you mean. I think our logics are both self-consistent, but I still want to express my follow-up views.

      1. I think we don’t need to be so pessimistic about the evolution of this “stochastic process” of problem coincidence in time. In fact, competitive programming has coexisted with the problem of coincidence for a long time, as we all know that the first ICPC World Finals was in 1977 — nearly 50 years ago. Staying optimistic is also an option. This stochastic process may fluctuate slightly, but I would like to believe that it has converged to a constant. It is true that there are more and more problems, but the algorithms and models that contestants can learn in a certain period of time are limited. Therefore, there must be many exquisite topics lost in the long river of time, which is indeed a pity, but from another perspective, it gives us the basis for optimism and the joy of reinventing and researching the old techniques. It’s a matter of perspective, and I have no more say than you, nor can I make sure that my beliefs are correct, but there must be some CPers who agree with me.
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        22 months ago, # ^ |
          Vote: I like it +53 Vote: I do not like it

        All of that is of no use if people think that screaming "OMG THIS PROBLEM IS FROM XXOI 1969 HERE'S THE LINK" into the comment section is good.

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

Just think of the candidate masters/experts, they solved problems till D/E by their own and now they are getting much lesser rank than they deserve.

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22 months ago, # |
  Vote: I like it +22 Vote: I do not like it

sorry,zxyoi.

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22 months ago, # |
  Vote: I like it +17 Vote: I do not like it

Is codeforces the next FJOI?

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22 months ago, # |
  Vote: I like it +32 Vote: I do not like it

then how do you know whether the writer plagiarized or it was just an coincidence? What about the competitors who should have had positive rating changes but got negative ones instead just because of those who discovered the coincidence and copy-pasted to pass F?Is it truly fair to them?

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    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Although the coincidence of problems always exists and it is hard to avoid, it doesn't mean that the contest should still be rated. The fact is not every contest has coincided problems, but all the contests which have these should be unrated.

    I made some problems before and I also created problems that coincided with others(luckily discovered by myself).But I don't think this can be a reason to keep the contest rated.

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22 months ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Actually I don't think it is that bad of a situation. If a person have somehow solved that 5 years old question and managed to remember that in a contest with a similar question, which happens extremely rarely, I think that guy deserves it. I mean a lot of questions are similar anyways. After thinking 5 minutes on a problem a lot of questions become the same anyways.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I could understand that the authors had paid many efforts, but I still think it's unfair that hundreds of participants solved F only by copying codes from internet. I think something should be done to make this round fairer.

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22 months ago, # |
  Vote: I like it +1 Vote: I do not like it

https://mirror.codeforces.com/blog/entry/106700

Is it fair for the authors who made amazing problems but it's unrated due to one problem? and now this round is rated?

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22 months ago, # |
  Vote: I like it +11 Vote: I do not like it

Maybe it would be a good idea to shut down all blog activity during rated contests.

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    22 months ago, # ^ |
      Vote: I like it +62 Vote: I do not like it

    This does not look like a solution, but sweeping the problem under the rug. Now there are a million other ways to communicate on the Internet.

    But yes. Probably the comments/posts need to be moderated more actively during rounds.

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22 months ago, # |
  Vote: I like it +42 Vote: I do not like it

How can a contest be rated with a so classic problem? How can so many contest writers and testers being unaware of this classic problem? By the way, the ICPC last week(Hong Kong Regional Contest) has a problem named Range Closest Pair of Points Query in 2D.

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22 months ago, # |
  Vote: I like it +38 Vote: I do not like it

You are right, but our compressed towel is small and convenient to carry. When you open it, it will become bigger when you put it in the water. It can't be torn apart. It is easy to use for wiping feet, face and mouth. You see it is as big as a round cake after you open it. It will become bigger and higher when you put it in the water. It has strong water absorption. When it is opened, it is a thickened towel. You can see how he can earn it and how he can make it. It's fine to use it seven or eight times. It's very convenient to take it with you on business trips. Wipe your feet, mouth and face with it. It's clean and sanitary. what? Where can I buy it? The small yellow car below, buy five bags and get five free, and return the package

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22 months ago, # |
  Vote: I like it +10 Vote: I do not like it

skipping F is the best choice over making the round unrated

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22 months ago, # |
Rev. 2   Vote: I like it +17 Vote: I do not like it

Yes, there is nothing wrong with the organizers of the competition. There is no need not to unrated. Participants who are treated unfairly should smile.

Fair competition? That's nothing compared with the efforts of the organizers.

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22 months ago, # |
  Vote: I like it +8 Vote: I do not like it

Could AI (perhaps LLMs) be useful for retrieving similar problems (like a search engine) to the one being proposed in a contest? Could an AI-based tool designed for cf be helpful preventing such coincidences beforehand?

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22 months ago, # |
  Vote: I like it -8 Vote: I do not like it

NO, I got a low standing and it means the contest will still be rated and I will get a negative rating changes...OMG

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

You maybe right, but I don't care if you were intended or not. That is sure that this competition had the original problem and it were severely affected score. You should apologize and find a way to reduce impact but not explain you were unintented.

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

If you can't make the round unrated then may be you could calculate the ratings by excluding the F problem.

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22 months ago, # |
  Vote: I like it +32 Vote: I do not like it

Support it. However, I personally prefer to remove F from the contest instead.

There are two kinds of people who solved F. One are those "participants remembering a wide range of tasks and knowing how to put them into practice", but another just got some information from social media, searched this problem on the Internet and then just copied someone else's code.

The latter are those we definitely criticize. Certainly removing F is unfair for those who solved it themselves, but I think they are capable enough to afford such rating changes about just one problem. (I am a newbie, and I believe those who can solve F independently are all at the level of orange or red)

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    22 months ago, # ^ |
    Rev. 2   Vote: I like it 0 Vote: I do not like it

    Positive Solution.

    Although removing F is unfair for someone,I think this is better than leaving the round unrated.The remaining part of the round is still creative and challenging.Besides,problem F did influence the round's fairness.So removing F is deserved.

    Preparing a Codeforces round is really difficult.No one can avoid making mistakes and the writers are not intentional.

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      22 months ago, # ^ |
      Rev. 2   Vote: I like it +9 Vote: I do not like it

      In fact, quite a few people are annoyed for we actually CANNOT confirm that the writers "are not intentional". They think Mike is kind of protecting "his writers" without any evidences. After all an F solved by 300+ people is truly unfair.

      But for me, I prefer to believe the writers are innocent. I also wrote problems for our school contest, so I understand that each problem is precious for writers. I can't imagine why a writer chose to make such an incident intentionally. Everyone clearly knows that wouldn't be nice. Do you believe the writer was dying for our criticism so that he did this?

      By the way, another version of this problem in Round #397 is kind of different. The array in today's problem is a permutation while another one has no limitations. That's one of the reasons why I believe this is just a coincidence.

      upd: Sorry for a mistake. The early version of this problem is numbered 765F in the problem list, from Codeforces Round #397, but I mistook it for Round #765. PS: I have never understood how are the rounds numbered. I tried to find the rule but failed. The numbers don't even follow the sequence of time.

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22 months ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

As for the feelings of the author, is it more important for him that his round remains rated or that his round was pleasant for the contestants or not?

It's amazing how some people who solved C after 90 minutes, failed to solve D, have their solution for F accepted in under 30 minutes. hehe

Don't click
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    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Maybe you should swap these 2 parts as you want to say something meaningful.

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22 months ago, # |
  Vote: I like it +8 Vote: I do not like it

I think we need a more clear set of rules to distinguish between rated and unrated competitions.

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22 months ago, # |
  Vote: I like it +14 Vote: I do not like it

Totally disappointed. You say that such a problem coincidence should not be unrated and you are strongly against the creation of such a precedent.

That may seem acceptable, however, have you thought about the consequences of letting it be rated? Then anyone can create a similar problem and say "I don't know the original problem before.".

If the contest is rated, I think Codeforces will close down soon.

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22 months ago, # |
  Vote: I like it +64 Vote: I do not like it

Problem F's name is a notorious coincidence

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22 months ago, # |
  Vote: I like it +21 Vote: I do not like it

Without subjective factors, objective factors are also important. Codeforces is famous around the world because not only the high quality of its problems, but also the fairness and justice. There is no doubt that problem F makes this contest unfair. To make this a fair contest, unrated this contest is necessary.

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22 months ago, # |
Rev. 2   Vote: I like it +18 Vote: I do not like it

Were there any comments removed?I see the total number decresing.Why?

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22 months ago, # |
Rev. 3   Vote: I like it -43 Vote: I do not like it

why not unranted.

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    22 months ago, # ^ |
      Vote: I like it -7 Vote: I do not like it

    After seeing so much of CP resources in Chinese, I wish that I knew Chinese.

    I hope one-day Luogu will be launched in English too.

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    22 months ago, # ^ |
    Rev. 2   Vote: I like it +28 Vote: I do not like it

    Shut up, Luogu contests are more of a trash can with some gold buried and there are ten times more errors in those contests. They fix it in the middle of the contest every time. In Codeforces this doesn't happen a lot so whenever this happens people go berserk.

    Codeforces is still the largest and probably best OJ in the world now. Luogu still has lots of catching up to do. Broaden up your horizons and see the world.

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      22 months ago, # ^ |
        Vote: I like it -9 Vote: I do not like it

      Some good problems are on luogu but not CodeForces.

      They are both nice OJ.

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    22 months ago, # ^ |
    Rev. 2   Vote: I like it +11 Vote: I do not like it

    I warn everyone who is reading this comment that the Chinese Version is completely different from the English Version.

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      22 months ago, # ^ |
      Rev. 2   Vote: I like it -6 Vote: I do not like it

      edited

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        22 months ago, # ^ |
          Vote: I like it +1 Vote: I do not like it

        The Chinese version is more unfriendly in this context.

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          22 months ago, # ^ |
            Vote: I like it 0 Vote: I do not like it

          The Chinese version is more accurate and unfriendly in this context.

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22 months ago, # |
  Vote: I like it +8 Vote: I do not like it

To be honest,Question F has nothing to do with most of us.The number of people who solved the A is eight thousand.And the number of people who solved F is only three hundred people.Most people struggle with the questions before D.We have no time to solve F.For me,I never read the F problem and even after all kinds of round,I just try to solve A,B,C,D and E.And in addition,as a Chinese people,most of the rounds in China is very late.Most of the time we stay up very late to participate in the round.So we very cherish the round which is friendly to us.I agree with MikeMirzayanov.

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    22 months ago, # ^ |
      Vote: I like it +10 Vote: I do not like it

    I did read F and wasted half an hour of my time on it, because the number of solution was higher than E so I thought probably it's easier than it looks. So, removing it is unfair to me, and others who spent their time on it.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Maybe we should close the blogs and comments during the rated contests. I think this can reduce the number of cheating.

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22 months ago, # |
  Vote: I like it +274 Vote: I do not like it

I am shocked by such a great number of impolite, unrelated comments in this post. And moreover, most of them are from Chinese high school students. If you want to share your view, it is fine. But what’s about those bad jokes and offensive words? I understand in your community, you guys have your own ways of spamming, discussing and thought sharing, but please don’t bring those trash (yes, I say trash) to everywhere. Before trying to be a good CP competitor, please learn how to be a decent person first.

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    22 months ago, # ^ |
      Vote: I like it -65 Vote: I do not like it

    You are right, but Gensh...

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    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    This is called the rubbish of Chinese online community, as a Chinese I can't agree with you more.

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      22 months ago, # ^ |
        Vote: I like it +2 Vote: I do not like it

      Maybe there are some misunderstandings, "the rubbish" is the rubbish joke, not people

      Forgive my poor English please :(

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    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    lol probably most of them are like 13 years old or something. Chinese high school students regard them as monkeys.

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    22 months ago, # ^ |
      Vote: I like it +13 Vote: I do not like it

    Can't agree more. I just don't understand why they are talking so impolitely.

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

    Agree. We should use logics and reasons to argue.

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    22 months ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    You are right, and fight them with downvotes.

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    22 months ago, # ^ |
      Vote: I like it -7 Vote: I do not like it

    I think it's a problem of the level of trash in the posts. I like it if it contains useful advice or arguments, plus some jokes. But I hate it if it only contains bad words or meaningless jokes. So is Genshen Impact really so interesting?

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22 months ago, # |
Rev. 2   Vote: I like it +26 Vote: I do not like it

I understand, but disagree.

We made rounds unrated because those coincidences greatly influenced the fairness. As a matter of fact, hundreds of people have passed F, which means the round should have been unrated according to the rules.

It should be judged not by sympathy, but by rules.

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22 months ago, # |
Rev. 2   Vote: I like it +1 Vote: I do not like it

Whether you agree that the contest should be unrated or not, you must admit that determining if a problem coincided with one another is getting more and more difficult with the increase of problems. We are human, so we can't remember all the problems.

So why not develop new techniques to check the problems? One way is to create a database of problems, where formalized statements, solutions and so on of almost all the public problems on the Internet are provided. And we can try to invent a bot to check if a problem coincides. Then at least we can reduce the problems coincide with those already exist on the Internet. Of course, no one wants to argue like this every day!

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22 months ago, # |
  Vote: I like it +276 Vote: I do not like it

What the actual f**k is this comment section?

I get that many people think that the round should be unrated. And I am one of them as well. I don't agree with Mike's decision, neither do I agree with the reasoning behind it.

But what disgusts me is how many people think that a wrong decision which affects their rating is a good enough reason to insult Mike or his relatives, to call him an idiot, to wish for CF's collapse and closing. They have no moral rights to say these things.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I wonder why many found F during the contest.I don't think it is so well-known a problem,and I may even didn't have a look at F during the contest(at least before I solve D).

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    22 months ago, # ^ |
      Vote: I like it +51 Vote: I do not like it

    Some contestants posted the link to the original problem in the comments of the announcement during the contest (which were removed quickly). I think many contestants saw these comments and copy-pasted.

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      22 months ago, # ^ |
      Rev. 3   Vote: I like it +29 Vote: I do not like it

      And I know some of my classmates solved this problem some months ago,they public the link with other classmates,so I knew it is an original problem 12 minutes after the beginning of the contest(Although all of us didn't take part in today's contest.)I think maybe many contestants know by this way.

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    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    At least all of my friends realized it after we read this statement,I think this problem is really classic.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I totally agree. Could anyone tell me which problem we are talking about? And what is the problem it coincided with?

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22 months ago, # |
  Vote: I like it -17 Vote: I do not like it

Yes, you're right. But codeforces is a Russian website developed by Saratov State University to provide an online evaluation system for enthusiasts of computer programming.

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22 months ago, # |
  Vote: I like it +6 Vote: I do not like it

and I also remembered there was a Div1 happened similar situations,and it was unrated.(my first participated Div1)And that was an AT's problem.

Why the two has different results?Because it's still unkown whether the problem provider did it on purpose or by mistake?(At least I don't know yet.Maybe I missed some important information.)

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22 months ago, # |
  Vote: I like it +8 Vote: I do not like it

If a contest is unfair, we should make it unrated, which does not mean that anyone was wrong.

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

Here's why.

Spoiler
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22 months ago, # |
  Vote: I like it +5 Vote: I do not like it

Anyway, A,B,C,D,E are nice problems. Perhaps removing F from the contest and make the round rated is a better choice, which avoiding the impacts of the problem coincide and respecting the authors's hard work as well. But that is only my opinion.

Hope such cases will not happen in the future any more.

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22 months ago, # |
  Vote: I like it +8 Vote: I do not like it

If unrated is the insult to author's effort, rated is the blasphemy to fairness.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Can i have a link to the original prob of problem F?

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22 months ago, # |
  Vote: I like it +14 Vote: I do not like it

Does an ACM-ICPC contest cancel its awards and eliminations if one of the problems is intentionally copied?

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22 months ago, # |
  Vote: I like it +8 Vote: I do not like it

Because this Div.2 Round I has just begun to learn and discuss Competitive Programming on CodeForces, I feel that the questions are very beautiful, with very novel ideas and very enlightening solutions, and the atmosphere of the discussion area is also very friendly. I look forward to more high-quality Div.2 Round!

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

Never expected Mike to make such an illogical argument (・o・)

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22 months ago, # |
  Vote: I like it -17 Vote: I do not like it

Do you really think that a coordinator should remember all 8500 problems from the archive (and, by this logic, 10,000 more from various other sources)?

No. But they should remember this problem.

Alright, let's have a look.

So far, in Luogu, the most famous OJ in China, there are over 2k submissions, 19 solutions for problem 765F. This is not a small number.

Not to speak of there exists another similar problem.

In the other hand, how could one submit the correct submission for F just 3 minutes after start?

If the contest is still rated, okay, you're right, but Genshin Impact.

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22 months ago, # |
Rev. 2   Vote: I like it +6 Vote: I do not like it

1.There is a rumor that CF has the original problem. Let me clarify that this is not a rumor.

2.New users may not know the value of CF coordinator. I will explain it here. Old users also do not know.

3.Half of CF users are cursing the original problem. I feel very angry about it. Is the other half not talkative?

4.Someone said that CF is an equal and free academic discussing platform. I checked and found that Mike said it himself.

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22 months ago, # |
  Vote: I like it +4 Vote: I do not like it

I cannot agree with your point of view. On Chinese contest websites, such behavior can lead to the question maker being held accountable and banned from submitting contest problems again. Once there is a case with the same topic as before but not unrated, there will often be poor quality topics in the future, which is very bad for CodeForces.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

And obviously it's different from ICPC.

As an offline competition,you can't easily find the code,copy it and submit.Just like many problems that they have the same way to solve but a bit difference.Although you may know how to solve it as soon as you read the statements,you still must be very careful with the details in your code.

But as an online contest who cares?The solutions on the Internet can help you deal with these details and all you need to do is just to copy the code and submit.

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22 months ago, # |
Rev. 5   Vote: I like it +12 Vote: I do not like it

If it was a offline contest, the problem coincidence might have less influence.

But it is an ONLINE CODEFORCES contest, the problem provider HAVE THE RESPONSIBILITY to check that wheather there's a same problem in past contests. And problem F is a very well-known problem, as far as I know, at least 60% of Chinese who's good at data structures used to solve it, it even appeared in a past codeforces contest. If F was not so well-known like that, I would stand on Mike's opinion, but obviously the problem provider didn't take the basic responsibility of providing problems. It should be unrated.

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    22 months ago, # ^ |
    Rev. 6   Vote: I like it +3 Vote: I do not like it

    If you want to provide a problem, a good idea is important, to avoid problem coincidences is also necessary.

    If you don't have the ability to take those responsibilities, then don't provide problems, you are not a good provider, solving your problem is a waste of time.

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    22 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    I agree with you that it should be unrated, but can I ask a question? How to check if there is a same problem in past contests, given that there are almost 8500 problems on this platform (as Mike said)?

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      22 months ago, # ^ |
      Rev. 6   Vote: I like it -27 Vote: I do not like it

      You could refer to what luogu is doing, they invite many problem checkers to check that. the checkers always be good at this knowledge or used to solve many problems of this knowledge, then they can avoid having the situation of problem F.

      Luogu is a Chinese Online Judge, the website is www.luogu.com.cn . It's all in Chinese, if you want to use it, you may have to use a translator.

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      22 months ago, # ^ |
      Rev. 2   Vote: I like it 0 Vote: I do not like it

      Of course that problem coincidences can't be completely avoided, but avoiding the situation like problem F is achievable.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Maybe finding the original problem is also an ability, but that is NOT what we really want. Also it is unfair to copy the code or communicate about its original problem.

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22 months ago, # |
  Vote: I like it +40 Vote: I do not like it

cfup

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

This is just a suggestion, don't know how helpful this might be, if a ques already appeared in a round before, we instantly know about it after the contest ends,the main reason for that most probably is that people try to search the question on web and see if a similar ques exists, well this type of searching can easily be done now by using AI softwares like chatgpt etc.

So my suggestion is that the testers can test the originality of the question by asking chat gpt or any other Ai to solve it, and since the AI tries to solve the question based on the past data it has been given, if the AI solves it we know for sure the ques has appeared before and the ques should not be included, but if it is not able to solve it, we are not completely sure that the ques has not appeared before but we can verify it's originality upto some extent.

Thank you

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22 months ago, # |
Rev. 2   Vote: I like it +43 Vote: I do not like it

I respect and appreciate the efforts of the authors. Such coincidence is not their fault, or anyone's fault, who prepared this contest. However, it is responsible to do something with the current situation. Most participants are honest. Their ratings may be affected by the result of these accepted submissions. Making this contest unrated may be one choice, but may not be the best one considering multiple factors. I hope there are some regulations or procedures to deal with such scenarios, or maybe it is acceptable to provide a proof that the influence is negligible.

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22 months ago, # |
Rev. 2   Vote: I like it -7 Vote: I do not like it

.

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    22 months ago, # ^ |
    Rev. 3   Vote: I like it +11 Vote: I do not like it

    You can see most of them who solved F also solved A-D,or solved A-C very quickly.

    If one cannot solve D and more,those people has very little influence to his final standing because even without F most of them is still ahead of him.

    But for those ratings over 1800,especially for CM,they can always solve D.In that cases their standings will change a lot.And if you experienced CM times,you'll find even 100 standings different will cause a lot to your rating changes.

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

Thanks for your effort. But I think it's not important to discuss whether to rate or not. We should pay more attention to avoid it happening again. Maybe we can refer to the formal examination. In my country, the authors of a test will prepare two versions of test paper. If something unexpected happens, we can use another version. So I think codeforces can do something like that too. If some problems are wrong or plagiarized, replace they with the problems of similar difficulty prepared for next contest and extend the time according to the changes of problems and when they are replaced.

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22 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I think , all this is happening because I almost became pupil.

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

Anyway,what I'm dissatisfied with most is neither whether the round should be unrated,nor whether the provider is on purpose or not.

I'm really dissatisfied with is the attitude when a behavior break the rules.

Okay,it's hard to build up a contest,but now it really break the rules,and you tell me that because it's hard to prepare a round,you'll keep it rated?

That's not the point!The fact is that it really break the rule.

Since you have this rule and really used it several times in the past,why can you have this one exception,or you want