Theo830's blog

Tester cheating in Codeforces Round #698!
By Theo830, history, 4 years ago, In English

I found a cheater in yesterday's round. He/She was a tester and he/she submitted from another account.

parker0523 = shirakami_fbk

I am not 100% sure but the coding style + template is exactly the same. Also, the submissions of the account are really fast for a low CM and his submission on problem C is very weird(105687315).

Please MikeMirzayanov check this out.

  • Vote: I like it
  • +392
  • Vote: I do not like it

Comments Comments (79)
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4 years ago, # |
  Vote: I like it +102 Vote: I do not like it

See these two : 104262133 and 104261969

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4 years ago, # |
  Vote: I like it -26 Vote: I do not like it

Similar case:

Your text to link here...

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4 years ago, # |
  Vote: I like it +61 Vote: I do not like it

Other than that, he obfuscated his code which broke rule#16. He should be penalized for that.

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    4 years ago, # ^ |
      Vote: I like it +171 Vote: I do not like it

    To be honest, your codes are even unreadable and unhackable compared to his codes!

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

      I am used to that type of writing codes. Sorry. But at least, you can format using Astyle my code. I am pretty sure it makes my code readable.

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        4 years ago, # ^ |
          Vote: I like it +26 Vote: I do not like it

        You cannot copy/paste code during the contest btw.

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4 years ago, # |
  Vote: I like it +36 Vote: I do not like it

To be honest, I think the first requirement to be a tester is to be a good friend of the writer. If not, then he / she is not qualified to be a tester. I also want to be a tester, but I know how low the probability of becoming a good friend of writer is, so I never expect it. I think that if it is true, his two accounts should be ban

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

    Testers are chosen somewhat randomly from Mike, I believe. I've been a tester for some contests since he messaged me about a day before and said 'test this plz'.

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

      Did he exactly wrote "test this plz" or you just changed the words to sound funnier? Just curious

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

        No of course not, the real message was this:

        Hi!

        It would be a real help for Codeforces if you can help with testing of 573.

        If you can do it, please, write me back. Don't worry if you want to take part officially or can't test it. I understand :-)

        Thanks, Mike.

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

          From these words, I can feel that Mike is kinda good person

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4 years ago, # |
  Vote: I like it +15 Vote: I do not like it

First of all, from the nmsl in the code of his question c, he can be sure that he is from China and not Japan. Then, the nohack function shows that he knows the loopholes in question c, and only a few people (writers and testers) know about the loopholes in question c before the game, that is, the probability of him being a tester is very high.

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

    I couldn't understand the point of that nohack function. How does it help with loopholes?

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

      I mean, his algorithm takes advantage of this loophole, and he knows that his wrong algorithm can pass the system test (unless someone creates strong enough hack data), the nohack function itself is useless, this is just like a prayer, but he The way of praying is really ugly.

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

    I don't understand at all why do you have to point out he is from China. What's the difference between a Chinese or a Japanese or a person whatever country you like cheating? Of course, the term nmsl is a derivative of Chinese and is indeed not decent, but how does this bother you? I am very bothered as a Chinese competitor.

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

Lol, such an unethical behavior

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

see these submissions :

105720589 105715921 105756626

while (true) {
    int abc = 0;
    abc++;
    abc++;
    abc--;
    break;
}

he just wrote above code every where to get rid of palagarism checker

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4 years ago, # |
  Vote: I like it +41 Vote: I do not like it

As a p*0523 Japanese, if this is true, disappointing.
Very personally view, but I think it's good to make it more clear how the testers are chosen.

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

    I think about half of it is searched by the coordinator, and about half is searched by the writer? But the specific standard is not known for the part where the writer searches. Most writers will find it from their friends?

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      4 years ago, # ^ |
        Vote: I like it +25 Vote: I do not like it

      Hmm, in my case, when I was a writer:

      • First, there were some testers chosen by coordinater-side.
      • When my contest was upcoming, someone who wanted to be a tester sent a message to me. I told it to my coordinator, then I was allowed to add some of them as testers.
      • I didn't find any testers from my friends.(Note: This isn't mean that I don't have CP friends)

      When I was a tester:

      • Sometimes, {I/they} {ask/be asked} nearby contest writers to join as tester(s).
      • I sometimes sent a message to some writers. Sometimes I could join as a tester and sometimes I couldn't.
      • I didn't asked from my friends to join as a tester(Note...)

      I heard that sometimes the testers are chosen random and they will receive a message.

      Anyway, I don't know clear rules about choosing testers...

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

        I heard that sometimes the testers are chosen random and they will receive a message.

        I've heard about 4 people who randomly got messages for testing, and they were all donors on the last CF donation section. So I think that is the most likely case (unless donors around me happened to be extremely lucky).

        I don't find picking testers from donors necessarily bad, but I hope CF admins are more clear about this, especially since issues regarding cheaters seem to have worsened recently.

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4 years ago, # |
  Vote: I like it +114 Vote: I do not like it

Oh! finally, some smart people pointed out there are cheaters from countries other than Indian as well. As I have seen quite a few blogs getting upvotes in the name of India.

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4 years ago, # |
  Vote: I like it +187 Vote: I do not like it

Codeforces has literally become like 'Among Us'. Every contest we have to find the impostors along with doing our tasks,

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4 years ago, # |
  Vote: I like it +2 Vote: I do not like it

I didn't expect that from our friend...

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    4 years ago, # ^ |
      Vote: I like it +16 Vote: I do not like it

    Judging from the information I got, he should not be your friend. If everything is true, I checked his information. He is still a middle school student and hopes to deal with it low-key. (But at least two of his accounts must be banned).

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      4 years ago, # ^ |
        Vote: I like it +18 Vote: I do not like it

      Sorry for low iq joke)) I've meant Fubuki not the person himself.

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    4 years ago, # ^ |
      Vote: I like it +41 Vote: I do not like it

    As funny yellow dog, I didn't expect that from you....

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4 years ago, # |
  Vote: I like it +15 Vote: I do not like it

I wrote a comment here for Guitar_Waale_Bhaiya AkashRamjyothi1

The funniest part is that he was again doing same kind of thing in yesterday's contest.

See these submissions 105874881 105895241 105915359 105929955

while (true) {
    int abc = 0;
    abc++;
    abc++;
    abc--;
    break;
}

He was again writing the above code everywhere.

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

    dude he does that in every contest what a little cheat all for a color in his name SAD vulgarity also this submission is all random vulgar dogshit

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4 years ago, # |
  Vote: I like it +48 Vote: I do not like it

IDK guys u should work in FBI not waste your great talent here, you've caught really dangerous criminals.

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4 years ago, # |
  Vote: I like it +15 Vote: I do not like it

I noticed that after recalculating the rating, his rating still increased. In other words, there is not enough evidence to prove that he cheated? Codeforces officials should be able to find more evidence, such as whether the historical login ips of the two accounts coincide and many more. Or did Mike not notice this post? If everything is true, although I don’t approve of making things big (he is just a middle school student after all), it’s not good to pretend that nothing happened, right?

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

    I always believe that it's really necessary to punish dishonest competition. But it seems that Codeforces didn't do a good job on this. =-=

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4 years ago, # |
  Vote: I like it -42 Vote: I do not like it

Man I can consider the case of cheating of a chinese but why Japan people are cheating. Chinese are the definition of cheating .

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

    If you are a Chinese, you will understand the meaning of nmsl in his code, shirakami_fbk must come from China, not Japan. In addition, what you said is suspected of regional discrimination.

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

      They are a threat ,not today but someday you will realise it.

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        4 years ago, # ^ |
        ← Rev. 11   Vote: I like it +21 Vote: I do not like it

        https://www.luogu.com.cn/paste/k7o3dkzb

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          4 years ago, # ^ |
          ← Rev. 2   Vote: I like it -43 Vote: I do not like it

          This comment had been deleted.

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          4 years ago, # ^ |
            Vote: I like it -38 Vote: I do not like it

          I agree with you.

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

          I think his problem is not so serious,but your opinion is too extreme.

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          4 years ago, # ^ |
            Vote: I like it +64 Vote: I do not like it

          I'm a Chinese, I love my country, but I downvoted every comment here. (Including yours)

          This person is definitely wrong. But he has received enough downvotes so most people here aren't really racialists, which means that there is no need to stress it again (someone already said that, why say it again?).

          Posting angry words in some old post just because you saw someone saying bad things about China and also calling others to attack him is just online bullying — I don't think what you did leaves others a good impression on China.

          China's positive international profile isn't created by posting angry and belligerent posts on Codeforces (a CP site!), but by hard work of all Chinese people.

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          4 years ago, # ^ |
            Vote: I like it +39 Vote: I do not like it

          Please, do not start politics here. If you think his comments are incorrect, you can downvote him or put forward your views instead of making personal attacks. Anything needs to be discussed objectively, since you mentioned "herefore, instead of establishing one more enemy, it is better to make one more friend.". We oppose racial discrimination, but have nothing to do with "China's development".

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        4 years ago, # ^ |
          Vote: I like it -37 Vote: I do not like it

        First we have to admit that there are Chinese cheating. But that is not a reason for you to say that "Chinese are the definition of cheating. " Cheating happens all around the world in every country, to your opinion, should I consider that the people of your country are all cheating? Nonsense.

        By W53729

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    4 years ago, # ^ |
    ← Rev. 2   Vote: I like it -13 Vote: I do not like it

    It is not like this.

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

    bruh, wut make u think like that? nmsl in english is sorta like the f word and the s word. and that's exactly what I wanna say to u right now. at last PLEASE STOP this regional descrimination. btw:I wonder wut happen with ur brain, are there any problems? if so, please fix it thx.

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

    You can keep your idea ,nothing would be changed though.
    The one who don't cheat still don't cheat,not affected by nationality or others' comments and prejudice .

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

    You are not qualified to evaluate our country before you really understand it.

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

    ？？？ racial discrimination

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

    Please pay attention to your words

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

    Deleted in order to prevent downvotes.

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    4 years ago, # ^ |
    ← Rev. 3   Vote: I like it -18 Vote: I do not like it

    [Deleted]

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

    (P.S. Update some personal opinion than rev. 1)

    To the person who wrote the comment, please stop your sayings of regional discrimination, for I don't want to be a Internet troll.
    However, Chinese OIer also needs to reflect on this matter, which shows that our OI still has a lot to improve.
    Although I'm also a Chinese, I will never justify the cheating of a small number of Chinese.

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

    How Dare You

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

    Your racism is very severe. If you believe that Chinese always cheat, I think your brain needs to be fixed.

    First, logically speaking, you say that "Chinese are the definition of cheating", meaning: "Chinese==cheating", meaning: "Chinese always cheat" and "Cheaters are all Chinese". I'm angry about it because I'm Chinese. I believe cheating is bad, and I also believe some Chinese cheat, but I don't cheat, and there are some cheaters from other countries. It is like you tasting a bad hamburger, and say: hamburgers are all bad. Also, I wonder what you'll say if someone in your country cheats, will you say that all of your country are cheaters?

    Second, I believe this idea of racism is very wrong. You are discriminating all the Chinese, including non-cheaters like me and the majority of Chinese.

    I think you should change your idea, because your racism is VERY DANGEROUS to the society and the world. If you don't, I can't help you, because in your left brain, there is nothing right, and in your right brain, there is nothing left, and I want to say: nmsl!

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    4 years ago, # ^ |
      Vote: I like it -12 Vote: I do not like it

    Who told you that？ your stupid brain？ I saw lots of Chinese coder here,and they downvote.（at least 30）. Because The Chinese are very patriotic. And I think they all right. Please don't judge a country by one person. Remember:Those who discriminate will be spurned.

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      4 years ago, # ^ |
        Vote: I like it -17 Vote: I do not like it

      Also,The people who downvote Without reason.

      Please think about what are you doing first.

      Codeforces is a great platform.

      Hope every body can respect others' correct idea.

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      4 years ago, # ^ |
        Vote: I like it +21 Vote: I do not like it

      Whatever your point of view, stop your personal attacks first

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

Testers should pay 200$ and they should get 200$ back if everything is ok

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

In addition, from the blog of parker0523, I can see his email address, which is very similar to the id of shirakami_fbk. I took a screenshot, but I cannot post it because it is suspected of infringing on personal privacy. However, I can say with certainty that the probability of two people being the same person is more than 99.99%. I hope that the codeforces official can investigate.

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4 years ago, # |
  Vote: I like it +31 Vote: I do not like it

First we have to admit that there are Chinese cheating. But that is not a reason for you to say that "Chinese are the definition of cheating. " Cheating happens all around the world in every country, to your opinion, should I consider that the people of your country are all cheating? Nonsense.

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

Don't you think that sometime this type of blogs create toxicity to this platform, agree they should be punished but there is no response on this thing even after 3 weeks of publishing.

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

Why was no action taken against him?

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

    Actually, I don't understand who is the person you want to take actions against to...

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