hogloid's blog

Somewhat suspicious coder
By hogloid, 10 years ago, In English

Do you know kutengine? He has made some remarkable result here(i.e. 2nd place in Round 257 — http://codeforces.net/contest/449/standings) However, I found some strange things about his logs — in #257, his submission logs are as follows :

  • 00:23:55 C Wrong answer on pretest 5 [pretests]
  • 00:26:05 B Wrong answer on pretest 4 [pretests]
  • 00:27:49 A Accepted [final tests]
  • 00:43:07 B Accepted [final tests]
  • 01:07:17 C Wrong answer on pretest 6 [pretests]
  • 01:15:19 C Accepted [final tests]
  • 01:16:36 D Memory limit exceeded on pretest 1 [pretests]
  • 01:18:47 D Accepted [final tests]
  • 01:45:52 E Accepted [final tests]

When you get WA in contests, sometimes you give up a problem temporarily, and move on to another problem. But if he did not solve A and B simultaneously, he solved problem A in less than 2 minutes! This problem A isn't that simple(it took fastest participant 5 minutes). Also, he made his first submission to problem D, just 1 minute after his submission to C.

Also his codes are a bit strange. Here are the codes of A,B and C in #257.

Many coders use "template" , on which they write codes. Usually, a person use the same template to avoid confusion. However, the three submissions seem to be based on different template. First code defines pair<int, int> as PII; but the second and third define pair<int, int> as pii; It would be too confusing!

The matters are almost the same in his last round — Bayan 2015 Contest Warm Up.

If he participated individually, I want to know why he made such a strategy.

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Comments Comments (24)
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10 years ago, # |
  Vote: I like it +112 Vote: I do not like it

It is Northern Korea. You can be sure that he participated not individually.

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10 years ago, # |
  Vote: I like it +44 Vote: I do not like it

Korea,DPR

I saw entry about this guys. They think it is team contests and they fight against "Chinese team ACRush". You can see more here (Russian): link

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10 years ago, # |
  Vote: I like it +37 Vote: I do not like it

A similar issue was brought up in Codechef a few months ago — http://discuss.codechef.com/questions/45900/north-korean-participants-competing-in-teams.

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

North Korean participants usually take part in contests as a team under ONE handle.

I do remember some more handles doing this, like RNS and RNS_MHB.

Note that RNS2 is also a team name registered for some ICPC Asia Regional contest last year.

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

    I don't know if they do it because they really think others are participating in teams, too, rather than individually, or if they just want to have an advantage over all the other competitors. Whatever the reasons, this is against Codeforces rules. I'm wondering if anything can be done about it (other than detect suspicious activity). As xorfire mentioned above, I brought this issue up also on Codechef a few months ago — but it appears than on Codechef there is no explicit ban on team participation under a single handle, so it seems that they didn't necessarily break the rules there.

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

      Teams from KimChaek UT have registered for several Asia Regional contests this year. They have not submitted their team name, but I assume there will be kutengine.

      I'll try to ask them if I have chance. Last year I meet some North Korean participants during Regional. They are "willing"(compared to their coach, who is completely silent) to talk about Codechef.

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

        I have talked to them too. They are really proud of their Codechef performance. :)

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

I think it's officiousness, but I couldn't stop sharing this with you:

Orzwzc_, _orzwzc, Orz__wzc, wzc1995, orzwzc1995, orzwzc, Orz_wzc, orz_wzc_....

and you can see other users here, now I am suspicious if all 31 handle from North Korea are 1 real person(maybe 1 group of people).

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

    This guy is not North Korean, he's Chinese. I know him..

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      10 years ago, # ^ |
      ← Rev. 2   Vote: I like it +18 Vote: I do not like it

      Which one of them do you know?

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

      "This guy"? There are 2 or 3 different code style in submissions of those handles.

      Well, not as obvious as lemon();

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

It really beats me how a talented bunch of people cannot realize that this is not a team contest. IMHO, it is obvious! Even if your IQ was < 0, you receive an instruction just prior to registering for a regular CF round that it's strictly an individual contest. How can one not notice that!!?

I could be going overboard here, but I think the way the press covers it in this article is just to safeguard an ulterior motive (which is to win every contest).

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    10 years ago, # ^ |
      Vote: I like it -36 Vote: I do not like it

    They compete for their pleasure, that's why they don't give a fuck. And it's right. IMHO.

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      10 years ago, # ^ |
        Vote: I like it +9 Vote: I do not like it

      So you mean to tell me that it is ok to violate rules for your pleasure? O.o

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    10 years ago, # ^ |
    ← Rev. 2   Vote: I like it +19 Vote: I do not like it

    Maybe they don't register at contest by themselves.

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10 years ago, # |
  Vote: I like it +27 Vote: I do not like it

if i wanna do cheat, except this cheat i will use 2 handles cause of dont take wa in pretest , but this people takes wa in pretest (they are noob cheaters :D)

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