CheaterExposer69's blog

Mass Cheating on Codeforces Round #813 (Div. 2)
By CheaterExposer69, history, 4 years ago, In English

The contest is not even over yet! And the cheaters are spoiling this place every day. They completely spoiled CodeChef. I stopped doing CodeChef for these people. Now they are killing Codeforces too.
These screenshots doesn't help about building any idea about the problem solution. I cropped them as the contest is not over yet.

  • Vote: I like it
  • +56
  • Vote: I do not like it

Comments Comments (26)
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4 years ago, hide # |
 
Vote: I like it -167 Vote: I do not like it

They did a great job, this is another trash contest anyways

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

    Why is it?

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      4 years ago, hide # ^ |
       
      Vote: I like it -133 Vote: I do not like it

      Problem B was pure guessing, another meaningless constructive problem, without any proofs

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        4 years ago, hide # ^ |
         
        Vote: I like it +45 Vote: I do not like it

        It is certainly not Pure Guessing! Wait for the editorial before you can say such stuff!

        But if you want the intuition:

        • You want to maximize the Sum of the LCMS. This means that you don't want any loss of TOTAL SUM in the form of COMMON FACTORS!
        • For Numbers with No Common Factors(Co-Prime Numbers), LCM is their PRODUCT! Hence, you would want to pick up Co-Prime numbers together.
        • Any TWO Consecutive Integers are Co-Prime with each other(Think about it, or look it up)!
        • Now, the reason for Grouping the Largest Numbers with their Neighbours together has to do with The below two facts:
        • They are Co-Prime with their neighbors. LCM is the Product and no loss in TOTAL SUM.
        • The largest numbers are grouped together. We are looking at the Sum of Products here. Say you have a set of Resources (1,2,3,...10) and A magical power to Multiply every resource with a Multiplier each chosen from (a, b, c, d, ... j). Assume Multipliers are in sorted order. If you want to maximize your Total resources, you will GREEDILY choose to give your largest Resource the Biggest Multiplier and so on! It is the same idea for this problem, to group the largest numbers together for the product, to Maximize the Sum of Products!
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4 years ago, hide # |
 
Vote: I like it -10 Vote: I do not like it

I think, if someone has the same code (not include emptiness) as someone, need to remove him from competition.

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

How does writing this helps in fighting plagiarism? On the contrary, now many other cheaters know where to look for solutions during the contests.

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

    It doesn't. But As a general user I don't know how else I can contribute to stop plagiarism. If you have any better idea to stop this thing as an user you are welcome to share those ideas with us (me).

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

      Yet you can simply post the code for Div2 A and submit it yourself, and the next day you'll get a list of cheaters in your email inbox, lamentably.

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

Link to the telegram group plx

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

Hope they all enter into div 1 and leave div 2 clean xd

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4 years ago, hide # |
 
Vote: I like it -6 Vote: I do not like it

Tell me the group link. Asking for a friend. Of course the friend wants to report the group.

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4 years ago, hide # |
 
Vote: I like it +7 Vote: I do not like it

what is the usage of cheating ? Will it make that person better in CP or will it make that person more addicted to cheating in the future ? Solve a problem with rating 800 by your own, I guarantee it's more fun than copying someone else's code for a problem with rating 2000, that's all i want to say. (sorry for the bad English)

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

They did a great job, this is another trash contest anyways

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