KAN's blog

By KAN, 7 months ago, translation, In English,

Hello everyone!

The Final Round of Technocup 2019 starts today, on the March 3, 2019 at 11:00 MSK (08:00 UTC)! To watch live results (only pretests are considered!), follow the link below:

Results of Technocup 2019 Final Round

Congratulations to the winners of Technocup Final Round 2019!

  1. Ildar 300iq Gainullin, Russia, Kazan'
  2. Semyon cookiedoth Savkin, Russia, Dolgoprudnyy
  3. Batyr Batrr Sardarbekov, Kazakhstan, Almaty
  4. Alexander scanhex Morozov, Russia, Saint Petersburg
  5. Sofia Sonechko Melnyk, Ukraine, Kremenchuk

For those who want to compete on the same problems, we will hold two regular Codeforces Rounds in the evening: one for the first division, and another one for the second. The rounds are starting at Mar/03/2019 18:35 (Moscow time)!

If you are a participant of the official Technocup Finals, you are not allowed to take part in the rounds at evening. We ask participants of the official Finals not to discuss the problems in open media till evening.

Good luck!

The rounds are over. We sincerely apologize for the fail with the mirror rounds, we thought the editorial was only streamed to other sites of the olympiad, not online. You can read MikeMirzayanov's comment about the situation. I hope you enjoyed solving the problems even though they did not affected your rating.

Huge thanks to those people who worked on the problems for you, namely Alexander Golovanov399 Golovanov, Konstantin zemen Semenov, Daria Dashk0 Kolodzey, Mikhail Endagorion Tikhomirov, Ilia irkstepanov Stepanov and Denis Denisson Shpakovskij.

Also thanks to Um_nik, adedalic, demon1999, Roms, _kun_, cyand1317, BledDest and Errichto for testing the problems, arsor for translating some of them into English, and _kun_ and arsijo for their help in conducting the mirror rounds.

Congratulations to the winners of the mirror rounds!

Codeforces Round #543 (Div. 1, based on Technocup 2019 Final Round)

  1. Radewoosh
  2. LHiC
  3. V--gLaSsH0ldEr593--V
  4. natsugiri
  5. V--o_o--V

Codeforces Round #543 (Div. 2, based on Technocup 2019 Final Round)

  1. Diazzz
  2. IhateProgramming
  3. Kunal.h
  4. galloska
  5. deep_savani
Announcement of Technocup 2019 - Final
Announcement of Technocup 2019 - Final
 
 
 
 
  • Vote: I like it
  • -2123
  • Vote: I do not like it

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7 months ago, # |
Rev. 2   Vote: I like it +106 Vote: I do not like it

Would not it be better to run all contests concurrently?

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

It's good to have too many contests regularly! We want more O_o

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

    It sounds interesting, but I' m afraid if I have enough energy to solve them...

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7 months ago, # |
  Vote: I like it -48 Vote: I do not like it

Bad time for Chinese users.Why not to start the contest immediately after the Final Round ends?

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    7 months ago, # ^ |
      Vote: I like it +66 Vote: I do not like it

    So, it will be bad time to other countries

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    7 months ago, # ^ |
    Rev. 2   Vote: I like it +3 Vote: I do not like it

    When a notice of a competition that begins at such a time is posted, there will be almost no doubt that there will be a comment saying whether it is a good or a bad time for the Chinese people. Especially, (for Chinese people) writing that it is a bad time is often a complaint. However, people in other countries don't usually complain about message boards when the competition begins at a bad time for their people. So stop complaining. There is no "good time for everyone".

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    7 months ago, # ^ |
      Vote: I like it -30 Vote: I do not like it

    兄弟,国际舞台留点素质

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7 months ago, # |
  Vote: I like it -20 Vote: I do not like it

can anyone provide me the list of the finalists?

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

Best of Luck Everyone :-)

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7 months ago, # |
Rev. 2   Vote: I like it -72 Vote: I do not like it

1

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7 months ago, # |
  Vote: I like it +35 Vote: I do not like it

How many problems for each divisions? Score distribution?

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7 months ago, # |
  Vote: I like it +115 Vote: I do not like it

One thing that we can learn from the live results:

Don't do task E.

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7 months ago, # |
  Vote: I like it -40 Vote: I do not like it

Due to the onside event, some functionality of Codeforces is disabled.

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

I want high rating.

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

is it rated ???????

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7 months ago, # |
  Vote: I like it -39 Vote: I do not like it

this is crazy

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

    Don't know anything else to comment?

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      7 months ago, # ^ |
      Rev. 2   Vote: I like it -186 Vote: I do not like it

      shut up cyan

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

        You are really ill-bred.

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

        Every grandmaster used to be a cyan.

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          7 months ago, # ^ |
            Vote: I like it -47 Vote: I do not like it

          tourist seems to be of another opinion sorry , you are wrong and you get no internet points

          destroyed

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

            Well you used to be a cyan recently, why disrespect cyans?

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

              its not that he is just cyan , its the fact that he is cyan and he dares put himself up against a grandmaster (me).

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

            Because he won the ioi before codeforces was found. And everyone used to be a newbie in programming. Maybe a cyan do better than you after a few months.

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7 months ago, # |
  Vote: I like it +519 Vote: I do not like it

There is a tutorial on youtube, avaliable for every participant of this round. Do cf admins seriously think that it's normal to make a rated round based on these tasks?

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

    Yeeeah

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    7 months ago, # ^ |
      Vote: I like it +9 Vote: I do not like it

    Unrated for Russians, I guess.

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

    I think KAN and MikeMirzayanov must know it

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    7 months ago, # ^ |
      Vote: I like it +60 Vote: I do not like it

    If this is true, I think this contest must be unrated.

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    7 months ago, # ^ |
      Vote: I like it +89 Vote: I do not like it

    Should have taken the Russian language course this semester :(

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      7 months ago, # ^ |
        Vote: I like it -31 Vote: I do not like it

      Not really required. Just use OCR and Google Translate. For example, editorial for E:

      E. The casino case

      . Return the restriction on the numbers and try to apply these as well. operations from left to right,

      . Suppose that we can not reduce the next couple of numbers' one of the numbers a'K and a'M is zero. It is easy to see that a'K> About ‹otherwise we would not want to perform this operation. So a`I: 0.

      . So, you must first increase the pair a ”cn and a'yu2 at least once, otherwise, at the end, a ... will be negative. We first do this an operation.

      . If this is not possible, we first perform the operation with a'N and a ..., also necessary for the same reasons, and so on.

      . It can be seen that we do not increase the number of operations, as we perform

      only necessary operations. So our answer is optimal.

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        7 months ago, # ^ |
          Vote: I like it +36 Vote: I do not like it

        Well... Your name said it all.

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

        I do think it's CodeForces's fault to make all participants waiting and then solving unrated contest.

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

          I don't think this is the person who is responsible; they are simply transcribing audio from the youtube video that was released, which is the actual ugly behavior.

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

          I think it's actually not his fault but the organizer who streamed the whole solution sharing session. Of course, posting editorial before any (rated or unrated) contest is bad but he is just pointing out that anyone could read the solution.

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

            Sure. Sorry for misleading may caused.

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    7 months ago, # ^ |
      Vote: I like it +97 Vote: I do not like it

    Топ 10 пранков вышедших из под контроля

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

    Tutorial on youtube — it's serious :)

    But if there was not any tutorial on youtube, does someone really believe, that it is possible to keep a problems in a total secret for a several hours?

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

How many tasks will there be for a round?

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7 months ago, # |
  Vote: I like it +124 Vote: I do not like it

"If you are a participant of the official Technocup Finals, you are not allowed to take part in the rounds at evening. We ask participants of the official Finals not to discuss the problems in open media till evening."

"If you are an organizer of the official Technocup Finals, you are not allowed to take part in the rounds at evening. We ask organizers of the official Finals not to discuss the problems in open media till evening."

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7 months ago, # |
  Vote: I like it +36 Vote: I do not like it

Is it rated?)))

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7 months ago, # |
  Vote: I like it +87 Vote: I do not like it

I want to ask again whether the contest is rated or not, because there's a guy saying tutorial was leaked on Youtube?

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7 months ago, # |
  Vote: I like it +98 Vote: I do not like it

Codeforces admins should get banned for cheating, I'm so disappointed KAN.

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

    Unfortunately since Codeforces is not blockchained, we cannot ban administrators by ourselves XD

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

      However, they can ban themselves :thinking_face:

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

        If they were honest enough to ban themselves, this wouldn't have happened.

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          7 months ago, # ^ |
            Vote: I like it +113 Vote: I do not like it

          I guess they already banned themselves. That's why there is no response from them. Much respect for their honesty.

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    7 months ago, # ^ |
      Vote: I like it +95 Vote: I do not like it

    Owo, there is a good contest website.

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

      Remind me when there is a contest coming XD.

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

      I feel compelled to register for AGC just for fun!

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

So disappointed that the solution is out :( However, how can you think that it is possible that nothing leaks hours after hundreds of people participating the round? I see no reason for the CF rounds and official round to be not at the same time.

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    7 months ago, # ^ |
      Vote: I like it +54 Vote: I do not like it

    Just so you know, the solutions weren't leaked by a contestant but by technocup themselves. They were streaming it on their youtube channel.

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7 months ago, # |
  Vote: I like it +86 Vote: I do not like it

KAN so finally, Is it rated or not?

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

Please make the round unrated. The editorials have definitely been leaked.

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

unrated please, it's not fair

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

Me in this contest

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

I'm not afraid because I know FFT

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

F all who knows solutions and still writes contest.

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7 months ago, # |
  Vote: I like it +546 Vote: I do not like it

Thanks for the fast editorial.

  • »
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    7 months ago, # ^ |
    Rev. 2   Vote: I like it +12 Vote: I do not like it

    That comment got deleted, but I'm sure many people already copied from it lol

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7 months ago, # |
  Vote: I like it +26 Vote: I do not like it

This round is unrated, but Admin will announce it when you guys already solve some problems

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7 months ago, # |
  Vote: I like it +160 Vote: I do not like it

big oof

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

WTH?:|

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7 months ago, # |
Rev. 2   Vote: I like it -10 Vote: I do not like it

Thanks whoever dirty person ruining the competitive mood of the round.
Btw, I'd be glad if worthy punishment is conducted upon him.

UPD: After knowing the exact cause I could only facepalm.
Not sure if the organizers were wrong or the Codeforces coordinators.

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7 months ago, # |
  Vote: I like it +448 Vote: I do not like it

But the editorials were leaked and solutions discussed by the official Technocup Group here.

Nothing wrong with the "members of the community".

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

    Perhaps they think unethical and ugly behavior is mentioning this link in comments :)

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      7 months ago, # ^ |
        Vote: I like it +126 Vote: I do not like it

      Ah yes, because it's much better to have fewer people cheating in private as opposed to exposing the organizer's fuck up. It's their own fault and should admit their mistake.

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    7 months ago, # ^ |
      Vote: I like it +225 Vote: I do not like it

    ![ ]()

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7 months ago, # |
  Vote: I like it +171 Vote: I do not like it

"Let's solve problems just for fun!"

means:

"It's 23:35 UTC+8 now, go to bed and have a good sleep~~"

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

    but why , why it became unrated

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

Seriously, why are you blaming the one who points out that your solutions are leaked? The one should be blamed is the guy who stream aka mail.ru. Your announcement repels me. Really...

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    7 months ago, # ^ |
      Vote: I like it +87 Vote: I do not like it

    Same, a bit confused about the announcement. Hope they called "members of the community" those who were responsible about livestream rather than danya090699

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7 months ago, # |
  Vote: I like it +955 Vote: I do not like it

Due to the unethical and ugly behavior of some members of the community, this round will be unrated. Let's solve problems just for fun!

Due to the unethical and ugly behavior of organizers who leaked the solutions in Youtube and blame participants for that, this round will be unrated. Now I can sleep just for fun!

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

    Due to the unethical and ugly behavior of the solution who leaked the problems in here, this round will be unrated. Let's implement the solution for fun!

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    7 months ago, # ^ |
      Vote: I like it +206 Vote: I do not like it

    I think Codeforces should apologize to m1los for muting him 48 hours because of this.

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      7 months ago, # ^ |
      Rev. 9   Vote: I like it +56 Vote: I do not like it

      m1los didn't do anything wrong.

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

        The f are you editing? I am curious.

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

          Minor mistakes.

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

            I don't see any change, same exact 8 sentences :'D

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      7 months ago, # ^ |
      Rev. 2   Vote: I like it +70 Vote: I do not like it

      In fact, he made the round the fair for everyone, and not some people having an editorial and some not.

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    7 months ago, # ^ |
      Vote: I like it +45 Vote: I do not like it

    I haven't heard of someone calling his behavior ugly and unethical.

    <copy-pasted-part> Much respect for their honesty. </copy-pasted-part>

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7 months ago, # |
  Vote: I like it +235 Vote: I do not like it

The fastest "Unrated" announcement in CF history :(

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    7 months ago, # ^ |
      Vote: I like it +317 Vote: I do not like it

    And also the most unethical and ugly unrated announcement in CF history, too.

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

    but why , why it became unrated

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

please keep a round tomorrow

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7 months ago, # |
  Vote: I like it +114 Vote: I do not like it

What a comedy!

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

This is bullshit, we were waiting for this fucking contest and we have this. it's up to you to review your servers...... And we don't have to take on the bullshit that some other moron did.

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7 months ago, # |
  Vote: I like it +190 Vote: I do not like it

凸(◕_◕✿)凸

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7 months ago, # |
  Vote: I like it +49 Vote: I do not like it

It means that the Youtube channel of Technocup 2019 is unethical :)

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7 months ago, # |
Rev. 3   Vote: I like it +34 Vote: I do not like it

The only good news here is not having to read the train wreck of a problem statement that is Div1A/Div2D.

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

    Pushing pretty complicated English words into the statement really is just a waste of time. We're not all English natives here.

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    7 months ago, # ^ |
    Rev. 2   Vote: I like it +77 Vote: I do not like it

    I saw the announcement, thought maybe I should still compete. I tried writing the code for A and saw the sample doesn't make any sense because of their shitty statement and eventually gave up.

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7 months ago, # |
Rev. 4   Vote: I like it +1 Vote: I do not like it

ok. div2 and div1 will be unrated.

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7 months ago, # |
  Vote: I like it +9 Vote: I do not like it

Wait 6 days for a round and it is unrated :))

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7 months ago, # |
  Vote: I like it +9 Vote: I do not like it

No fucking way

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

It is too bad when you see that you are the 40th and you will get +280 and then it becomes unrated

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

    but why , why it became unrated

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

hey , can anyone tell me why this became unrated ?

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

    leaked editorial

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

      how , where is the editorial ? where it got leaked ?

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

        i don't know. Notification says that somebody has leaked the editorial

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7 months ago, # |
Rev. 2   Vote: I like it +93 Vote: I do not like it

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7 months ago, # |
Rev. 2   Vote: I like it +376 Vote: I do not like it

Oops, forget to downvote the post!

[ Dear Codeforces, don't give us the tutorials in Russian and call our behavior ugly and unethical. We are here because we love this community (excluding all those intellectual alts). Don't make us get away from this beautiful community! ]

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

    but why , why it became unrated ?

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

    Do you mean Codeforces was wrong at the first place and the guys posting editorial in the comment section had no fault? I've seen someone posted a full list of editorial for the problems earlier (deleted).

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      7 months ago, # ^ |
        Vote: I like it +26 Vote: I do not like it

      Codeforces admins made a YouTube live stream with the editorials written in Russian. m1los translated the editorials and put them here. Codeforces banned him for 48 hours even if he didn't do anything wrong.

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      7 months ago, # ^ |
        Vote: I like it +26 Vote: I do not like it

      I believe that organizers are totally wrong and nothing wrong with the community. If they didn't leak the tutorial, there will be completely OK. But if they leaked, somebody will show them to the community; even if nobody shows tutorial, how can we trust rank 1 was not copying solutions?

      I think not holding offline and online contest simultaneously is totally a mistake.

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

        I think organizers had fault this time, too. But seriously, the guys translating the editorial and posting it hear leaked the editorial too, and you say the community has no fault while blaming organizers for leaking editorial. Correct me if I'm wrong.

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

          It's like:

          Samsumg sends photos of its new phone to everyone in South Korea then someone puts the photos online and then Samsung sues him for posting their photos of their "secret" new phone.

          Replace Samsung with CF, photos of new phone with editorial of the new contest and South Korea with Russia.

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

          It was already leaked, just because not many people knew about it doesn't mean its OK to keep the contest rated. When they posted the editorial here they forced codeforces to make the round unrated which is the right thing to do.

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

            Yeah, I feel like Codeforces was wrong when they could had unrated the contest in peace without pointing out some members in an unacceptable way. Let's wait for their responses.

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

          What I see is that leaked information could not be leaked again. He is just posting something that is public to another public place. Moreover, I think (just my assumption) CF won't make the round unrated if they didn't re-post the solution. Then it would give great advantage to people who know Russian/OCR.

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7 months ago, # |
  Vote: I like it +75 Vote: I do not like it

In korea it's 1 AM and why was I woke up now for?

go to hell ugly

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

Now I can watch the Merseyside derby :D

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

I was waiting for this for a week, it's my second round on CF

And then it gets unrated.

Fk.

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

The worst cf round i've seen in my life

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

    why ? questions were solvable ?

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

      shitty statements and leaked editorial. Anyway, i was close to solving B, and round became unrated

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

        ok , good . i was solving cs academy problem .. suddenly i remembered there is a cf round too . so i came to cf , solved a , passed pretest and just after pretests was passing or u can say it was in queue , round became unrated . lol .

        now i can solve csa again , will solve this technocup other day.

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

Why not hold the contest on March 3, 2019 at 11:00 MSK? I had seen it on the list. But the problem itself is kind of interesting.

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

Tasks are interesting, the situation is bad.

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

was not expected from cf! waited for 6 days :(

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7 months ago, # |
  Vote: I like it +50 Vote: I do not like it

Submitted all the problems like this

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7 months ago, # |
Rev. 2   Vote: I like it +33 Vote: I do not like it

I'm so disappointed with the organizer of this round. I stay up late for this round and you tell me that the editorial has leaked (by yourselves) and the contest is unrated????

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

The contest is unrated because of tutorial on Youtube.

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

Due to the unethical and ugly behavior of some members of the community, this round will be unrated. Let's solve problems just for fun!

Time to sleep I guess!

BTW, Which member of the community showed un-ethical behavior, the organizers themselves post the solutions and expect people to close their eyes?

  • »
    »
    7 months ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Many people watch the lives and some people indicate it in the comments for unrated.

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7 months ago, # |
  Vote: I like it +175 Vote: I do not like it

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7 months ago, # |
  Vote: I like it -11 Vote: I do not like it

Anyway,cheating is still the unethical and ugly behavior! The cheaters should be responsible for what they did.

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

    It's an accident. Official Technocup Group released the solutions via Youtube live.

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7 months ago, # |
Rev. 2   Vote: I like it +25 Vote: I do not like it

If you want to be a master of programming, I recommend you to register in quera.ir.

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

Hmm seems the people are talking about me XD

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    »
    7 months ago, # ^ |
      Vote: I like it +14 Vote: I do not like it

    Someone just made a new account for this huhh!

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

I recommend you to see this link: https://quera.ir/profile/ali64

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7 months ago, # |
  Vote: I like it +187 Vote: I do not like it

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7 months ago, # |
Rev. 2   Vote: I like it -38 Vote: I do not like it

Maybe a little bit late for this round, but I suggest making the round anti-rated when this happens the next time, i.e. the rating goes the opposite way. So that if you cheat and get extremely high scores, your rating drops to the floor.

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

i was going to be master :((

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

If you are a participant of the official Technocup Finals, you are not allowed to take part in the rounds at evening. We ask participants of the official Finals not to discuss the problems in open media till evening.

Maybe it's hard to control.

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7 months ago, # |
  Vote: I like it +265 Vote: I do not like it

.

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7 months ago, # |
  Vote: I like it +28 Vote: I do not like it

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

wondering why this round wasn't at the same time of the official one!

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

I'm so sad :( unrated is not funny

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7 months ago, # |
Rev. 2   Vote: I like it -53 Vote: I do not like it

Was this contest completely ruined?

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7 months ago, # |
Rev. 2   Vote: I like it +44 Vote: I do not like it

A fun and quite sad fact:

The whole situation reminds me of Croc Cup 2016 where the codes of official participants were revealed and the organizers blamed the community for sharing them. At least back then they claimed partial responsibility for making the mistake.

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

but V--gLaSsH0ldEr593--V will be angry for this..

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7 months ago, # |
  Vote: I like it +12 Vote: I do not like it
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7 months ago, # |
  Vote: I like it +1 Vote: I do not like it

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

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7 months ago, # |
Rev. 2   Vote: I like it -8 Vote: I do not like it

that's not fair. i think i would be expert if this round was rated.and also i didn't cheat in the exam and i solved them myself.

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

wow I have never seen that much dislike on cf.

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

The comment section which is used to discuss editorials after the round turns into in-round editorials and meme-creation

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

Does anybody knows how to solve problem F Div2, I tried to use a tree and DP but I get Memory limit exceeded on pretest 8?

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

    read the tutorial on youtube

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

    You can copy suffix automata from internet.

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

    (Not perfectly) Translated from Russian tutorial on Youtube :

    Let's use the method of dynamic programming. Let ans[i] equal to the minimum cost to compress the prefix of length i.

    For the transition of the second type, check that the substring s[j...i] it was encountered as a substring in the prefix s[1.j-1].

    The easiest way to check this is to calculate the z-function for inverted prefix of length i.

    There are other options to check it, for example, using prefix-function or hash.

    Complexity is O(n^2).

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

    You can easily do it in without any string algorithms. See my solution.

    This solution can also be further improved by using for example hashing to run in .

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

      I don't think you can get with hashes, but it can be easily done with SA (automaton).

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

    My submission: https://codeforces.com/contest/1121/submission/50753091

    Used an iterative DP to be safe from an MLE/TLE verdict. Let dpi be the minimum cost for the substring s[i..n]. Now at index i, you could simply go to the next index and incur a cost of a. Else you can incur cost b for the largest possible prefix of s[i..n] (of length say len) which is also a substring of s[1..i - 1] and go to index i + len. This can be found straightforwardly using KMP in O(n). Choose the minimum operation for each index and the answer will be stored in dp[0]. Total memory and space complexity = O(n^2).

    P.S: Base case is i = 0 where you can only use single letter operation. P.P.S: I've used 0-based indexing for DP in my code.

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

Did anyone else have fun solving problems and doesn't care that it's unrated because who cares about rating really?

Or is it just me?

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

How to Solve Div 2 — C?

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

    I did the simulation by just coding the statement of this problem.

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

Fucking hackers! -660!!!

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

It is not true to decide the round to be rated or not based on the contestant's performance.

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7 months ago, # |
  Vote: I like it -32 Vote: I do not like it

I broke into top 50 for the first time and it is unrated :(

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    7 months ago, # ^ |
    Rev. 3   Vote: I like it +27 Vote: I do not like it

    I also broke into top 10 for the first time :(

    However, I think that if it was rated, I would not be in top 10 because many top coders will participate seriously in this contest.

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7 months ago, # |
  Vote: I like it +144 Vote: I do not like it

KAN, MikeMirzayanov mind publicly explaining why is it community members' behavior which is called "ugly and unethical" and not of those who made that stream with editorials or yours for thinking that hiding it is the better option?

I wouldn't call you out if it was a single case, but I clearly remember some other similar cases when you blamed people who notified community of leakage and not yourself for making it possible and hiding it. And using this as general codeforces policy seems pretty bad to me, I think many will agree.

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

Is this officially the most downvoted post??

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

"Let's solve problems just for fun!" Well...I think reading comments section was more fun XD

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

What a nice contest! so funny :(

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

One moment, I saw the CF Rating Predictor showing +125 on my rating, and the next moment, I saw the announcement of the Contest going Unrated. RIP CF Community. :-(

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

Thanks for the great contest! I wasn't sad at all when I knew I got FST!

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7 months ago, # |
Rev. 2   Vote: I like it +344 Vote: I do not like it

Sorry guys. I did not understand the situation enough and sent the wrong broadcast. I apologize. I did not realize all the details about the streaming, I thought that it is more private. The next time we host an event in such a way, we will abandon the round or hold it in parallel. Holding such an event requires a lot of time and effort. We did this online streaming for the first time, I didn’t have enough time to go into details. I slept about 7 hours in the last two nights. Sorry again for the situation.

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7 months ago, # |
Rev. 2   Vote: I like it +13 Vote: I do not like it

i think I am one in those people who not focused on whatever contest is rated or not, Editorial is published or not before the contest. Don't blame each other. We both need to each other(participants and codeforces community). But problems were really interesting. at one moment i felt that i would be not able to solve a single question but at last i solved one problem.

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

Don't be childish, this just happened once after a couple of nice and cool problems and contests.

If you think you have been disrespected, just come here( Iran ), you'll get used to these situations.

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

Guys, I see many fellow coders just giving contests only by the sole purpose of ratings. Today the contest participation decreased by nearly a half after it was announced that the contest was unrated. This behavior does not stand as a healthy competitive mind. Everyone shuould be more focused on improving skills rather than ratings. And down voting the contest announcement only because it was unrated, won't make u achieve anything.

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7 months ago, # |
  Vote: I like it -62 Vote: I do not like it

It's also not fair to people like me. I didn't even know that there was an editorial and I became second in the div.2 round. Now I won't receive the 260 rating I deserved. It's super unfair to make the round unrated, because of one stupid misunderstanding between Codeforces and Technocup. There's been many other rounds like this (well not with published editorial, but you can still learn the problems from someone participating in the actual contest). What I'm trying to say is that, when you want to cheat, you can always do it. But should we always make the rounds unrated, because of those cheaters? And there are so many people in my situation. Codeforces has really disappointed me.

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    »
    7 months ago, # ^ |
      Vote: I like it +26 Vote: I do not like it

    You aren't deserve that 260 because so many people who could get better result than you gave up this contest

    Talking about cheating, can you suggest any possible solution to detect a cheater?

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

blog got more than 1000 downvote , I think it's biggest number ever of downvotes

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

When is editorial coming out?

/s

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

This contest had so much in common with youtube rewind

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

Read this sad story

When you try to outdo the odds ,

And set some goals such as becoming an expert in 46 days

And when you see your goals come true

288 on the world and you are in Pupil rank

The contest becomes unrated

I am very upset and I feel injustice

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

    .

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

      One day I thought the ACM community is safe, I thought that any one in this community had the inner strength that made him refuse cheating and cared about himself.

      But unfortunately, I think this is a mistake, and some of them want to present themselves to people no more

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

aha, can anyone tell me where is the video editorial on youtube?

Is that in english?

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

Thanks for FAST editorial

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7 months ago, # |
  Vote: I like it -51 Vote: I do not like it

Good luck next time, guys. Don't understand why the community is downvoting this post. This time problems are swapped, next time problemsetters will be swapped for better ones :)

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    7 months ago, # ^ |
      Vote: I like it +84 Vote: I do not like it

    Hey, what is problemsetters' fault?

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

      Well, from my purple point of view it's kinda funny that problems were rearranged in a way A < С < D < B as a result of a technical fault. For me it's more likely that the order wasn't checked before contest (maybe I'm horribly wrong here, and problemsetters have nothing to do with Polygon, but, you know ... :).

      Evidently, the point was not about problems' quality or too fast editorial. No more stupid trolling, I promise.

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

    :c

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

CF-predictor sais that if the contest were Rated,my rating changes
1871 -> 1960(+89)
WITH THE SADLY TROUBLE,I MISSED TO BACK TO CANDIDATE MASTER:(

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

For Div1 D, for test 8,my solution predicts to choose 2,4,8,9,10 nodes which costs 1578188168 while jury answer picks 2,4,5,8,9 which costs 1952195409. I feel the set which my solution chose is sufficient and better than jury's set. Can someone help what I am missing ???

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

    I had a similar issue. You can't distinguish nodes 5 and 6 in that solution.

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

      isnt it like 10 takes care of node 5 and 4 takes care of node 6.

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

        Changing a node changes all leaves in the subtree. So 5 and 6 are always changed together.

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

Lol While the post gathered record amount of downvotes, it seems that the comments in total gathered record amount of upvotes

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7 months ago, # |
  Vote: I like it -19 Vote: I do not like it

Couldn't the admins just identify the violators and punish them individually instead? Or maybe such a thing is too tricky?

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7 months ago, # |
Rev. 18   Vote: I like it +117 Vote: I do not like it

I still don't get it. It's okay that you screwed up with public translation and leaked the problems, ok, shit happens, people make mistakes, it's a big event and your first-time blablabla. You don't have to be really sorry for that, you made round unrated, ok, problem solved, be better next time, no one blame you for that.

The main thing for me is that you publicly, without any little research on the situation, blamed codeforces users for your own mistake, you BANNED someone for your own mistake, you tried to hide your own mistake when it's was obvious that you leaked your problems and tried to put that blame on codeforces users, and still, no one apologized for that. You just offended all the community with your truly unethical behavior, you tried to lie to all the community and you continue to act as if nothing happened and you did nothing wrong. I'm so disappointed and, actually, quite surprised by this behavior from the goddamn administration.

Also, this whole lie is just stupid. I mean, you are really saying that you noticed comment with english translation of the tasks but haven't noticed the comment before literally saying "Your solutions are publicly available on youtube", more than that, there was a guy who told you on the microphone that your solutions are streaming publicly, and now Mike says "Oh we didn't know it's public..." Really? How much do you have to not sleep to say something like that? And what did you think about the translation exactly? That it's only being streamed for... people sitting in the hall, watching it live? Translation can only be public, that's the point of translations. I would believe and understand if you said "Oh we forgot about Codeforces round, sorry", but your excuse for the situation is just wtf.

I want to believe this all is just a sequence of stupid mistakes and things that are done without thinking, but since you are so silent and persistent in denying your fault here (KAN? You was the one staying on the stage answering the question about the translation, and correct me if I'm wrong, but your answer was just another false statement), it's hard to believe so. And you are even saying that "The next time we host an event in such a way, we will abandon the round or hold it in parallel." as if it contestants fault. No. There were a lot of mirrors before that was run long after the official olympiads, and it always worked just fine. All you have to do is close broadcasting for the editorial next time, it's only your's silly mistake.

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

    Translation can only be public, that's the point of translations.
    This contest was held at several places; the translation was for those participants who were at other sites

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

    you tried to hide your own mistake when it's was obvious that you leaked your problems and tried to put that blame on codeforces users, and still, no one apologized for that

    They did apologize for that:

    Sorry guys. I did not understand the situation enough and sent the wrong broadcast. I apologize. I did not realize all the details about the streaming, I thought that it is more private.

    Somebody messed up and it isn't necessarily someone from CF staff. Different people are responsible for different things. Do you expect them to throw someone from Technocup under the bus? And yes, reading one comment and not a comment above is possible (for CF especially if you use a link because it scrolls you such that the comment is on the top of page).

    And yes, the whole situation is bad.

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7 months ago, # |
Rev. 2   Vote: I like it +4 Vote: I do not like it

technocup:what a notorious coincident!

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7 months ago, # |
  Vote: I like it +30 Vote: I do not like it

No matter the reason why this round gets unrated, in a word, these problems are still fun to solve. Unrated rounds just mean to me that I will take more time thinking about correct solutions than typing correct code and debugging. During this contest, I revealed 3 solutions in div.1 and felt free to discuss them with my friends. Although I need to keep up very late, in my country, to participate in this contest, I really enjoyed myself. I would not blame the organizers of onsite round or anybody else, because I solve problems for myself.

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

why are there so low number of submissions of DIV 2 C it is quite trivial.

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

    Because everyone gave up this contest after unrated announcement

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

Ok, but could we get english tutorial?

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7 months ago, # |
  Vote: I like it -13 Vote: I do not like it

I missed this round yesterday and joined codeforces.com only next day to read some news. On main page I've read who won this contest: "Congratulations to the winners of the mirror rounds!". Thanks for announcing winners! ;)

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

when tutorial will be publish ?

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7 months ago, # |
  Vote: I like it -39 Vote: I do not like it

what a joke. we work our assess off to get good results, we burn our brains off to get the right results and to optimize our code as much as possible and you just make it unrated for no reason. this truly shows how little we mean to you. very unprofessional of you. disappointed with the whole cf team.

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7 months ago, # |
  Vote: I like it -46 Vote: I do not like it

Folks, Just give a call when a missile has to be launched to destroy CF as we destroyed india a few days ago. Mighty pakistan blowing whistle in the air

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7 months ago, # |
  Vote: I like it +61 Vote: I do not like it

Will the first blog post ever to break 1000 downvotes also be the first to break 2000 downvotes? Two records in one!

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7 months ago, # |
Rev. 2   Vote: I like it +47 Vote: I do not like it

fun fact :

number of downvotes on this blog is more than rating of 3/4 of active users on codeforces

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

What about the editorial? XD

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7 months ago, # |
Rev. 2   Vote: I like it +39 Vote: I do not like it

I promise I will not downvote the editorial. Please publish it!