VK Cup 2015 — Wild Card Round 2
By MikeMirzayanov, 10 years ago, translation, In English

April 18, 18:00 (UTC) the second Wild-card round of VK Cup 2015 will take place.

Participants are invited to achieve progress in solving an unusual problem. VK Cup teams which were advanced to the Round 2 (and didn't advance to the Round 3) will take part in VK Cup 2015 - Wild Card Round 2 officially. In addition, this round will be open to the public for unofficial participation for everybody. Registration will be open for the whole round duration.

The round will be one week long. After the end latest submission (with positive score) of each participant will be judged on system tests.

Good luck!

UPD.: System testing is done. Final tests are available by link: http://assets.codeforces.com/files/vkcup-2015-wildcard-2-tests.2.zip

You can appeal on tests and their answers until April, 28th, 23:59:59. After that we will finalize the results. After finalizing all found bugs will not affect the final standings.

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Comments Comments (52)
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10 years ago, # |
  Vote: I like it -8 Vote: I do not like it

Good luck

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

There will be no contest for a week?

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10 years ago, # |
  Vote: I like it -31 Vote: I do not like it

is it rated? :/

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10 years ago, # |
← Rev. 2   Vote: I like it -11 Vote: I do not like it

sorry , my english isn't very good i didn't find out what participants can register for contest because i can't register for that

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10 years ago, # |
← Rev. 2   Vote: I like it -35 Vote: I do not like it

Hey, guys, I have problem statement from an insider!!!! We will have to optimize Codeforces platform to stabilize CFRs :)

(upd) And I was right! :D

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10 years ago, # |
← Rev. 3   Vote: I like it +24 Vote: I do not like it

No C#? I think it is better language for big oop task. And for work with strings also (I mean splits, regexps and other). Or vkontakte don't like it?

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

I cant register for some reason. It says registration is private.

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

so we can't have a contest (one with actual problems) for another week huh?

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10 years ago, # |
  Vote: I like it +103 Vote: I do not like it

Probably you should disable viewing the submissions source codes after the contest, otherwise the cheaters will learn how to trick your detector.

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    10 years ago, # ^ |
      Vote: I like it +56 Vote: I do not like it

    It is true. Thanks.

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

      Maybe opening submissions except top 10 will not harm. And many of us will be able to learn new things from other solutions!!

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

    I really want to know the algorithms used by others. What a pity!

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

    Even if the algorithm used to solve a problem can be posted on the editorial, the implementation also matters a lot. One learns a lot by looking at the implementations of good coders, so that in future we can save both time and effort.

    I'd be disappointed if this happens, because the ability to view good solutions is one of the many reasons I like CodeForces a lot.

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

Is there any way to manually test with custom inputs? I don't know if it's possible to do custom invocation with this kind of input, and I don't really know how to run tests on files like these offline.

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

    Never mind, I figured out how to test offline.

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10 years ago, # |
← Rev. 2   Vote: I like it +16 Vote: I do not like it

What is the difference between Wrong answer and Accepted [0 points]?

Edit: Wrong answer = false positive, Accepted [0 points] = didn't identify anything at all

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

Do the first 10 system tests correspond to the training data?

Edit: Yep

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

It seams that you don't use -O2 option for compiling codes in C++11 ZIP, what's the reason ?

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

Maybe I misunderstood scoring algorithm, but why I don't get any points on 4th test with program that prints

3
10936.cpp 12843.cpp 
14203.java 15148.java 
3484.cpp 5219.cpp 8705.cpp
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10 years ago, # |
  Vote: I like it +173 Vote: I do not like it

It would be extremely ironic to cheat in this contest :)

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

    We will run winnner's solution against contest submissions.

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      10 years ago, # ^ |
        Vote: I like it +28 Vote: I do not like it

      maybe winner is the cheater one?

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

      I expect almost all solution to fail to find similarities in zip archives.

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

Will codeforces Contests tab be unavailable during this 7 days ?

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

Hmm, I don't have any experience with this kind of tasks. Can someone please tell me how should load the files or show me some sample code ( not one wich solves the problem , just how to load them)

As far as i got is this :

1)I'm given an input with some file names.

2) I should load them from some (for example) "01.zip" file ? or All the separate (the .cpp/.pass) files inside the "01.zip" should be copied in my Project folder and only then they should be loaded.

3) Whats the thing with .a files (for example the "01.a" file)

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

    1) Yes

    2) Input test files are located at (for example) "01.zip", but on server they would be in the same folder, as your programm

    3) .a files contain jury's answers to tests

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10 years ago, # |
  Vote: I like it +30 Vote: I do not like it

Great contest!!

thank you!

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

I tested in my local.my code is printing output in output.txt but i got runtime error. Can anybody help me ?

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    10 years ago, # ^ |
    ← Rev. 2   Vote: I like it +17 Vote: I do not like it

    Not sure this is the problem, but instead of

    public static String dir=System.getProperty("user.dir");
...
Scanner sc=new Scanner(new File(dir+"/input.txt"));
...
File f=new File(dir+"/output.txt");

    you should write

    Scanner sc=new Scanner(new File("input.txt"));
...
File f=new File("output.txt");
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10 years ago, # |
← Rev. 5   Vote: I like it +9 Vote: I do not like it

For example: if answer on some test case is

1

1.cpp 2.cpp 3.cpp 4.cpp

and my program printed:

2

1.cpp 2.cpp

3.cpp 4.cpp

what will be my score ?

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

    Probably it will be 2 / 6 * 100 = 33 points (because jury's answer consists of 6 pair of similar solutions and in your answer are only 2 pairs)

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

    I think it is 100*2/C(4,2) = 33

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

Is there test,with cheating codes,in two differ languages? (for ex: java and cpp codes)

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

    It is acceptable (though rarely) that the couple of fraudulent statements is written in different languages.

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10 years ago, # |
← Rev. 2   Vote: I like it +13 Vote: I do not like it

Not sure if I am missing something, but I can't find the sample tests here: http://assets.codeforces.com/files/vkcup-2015-wildcard-2-samples.zip

EDIT: Here they are: http://assets.codeforces.com/files/vkcup-2015-wildcard-2-samples-1.1.zip

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10 years ago, # |
← Rev. 2   Vote: I like it +13 Vote: I do not like it

While I was thinking about it all my ways of thoughts went to Rome one idea to use some lexer (and parser if possible) in order to for example remove unnecessary newlines, unused variables etc. And if you look at it closely you will see that that exact things are done by compiler. So my suggestion will be to not only revolve around sources but also use machine code (for compiled languages) or bytecodes (for java, py, c# etc.) for comparison.

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

Is any partial score considered as a wrong answer ? I request to change the colour of partially scored solutions from red to anything else, it looks really depressing.

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