SirShokoladina's blog

By SirShokoladina, history, 12 days ago, translation, In English,

Hello, everyone!

We are a Death Metal band Skyglow. Recently we released our first album. And since we happen to be sport programmers, we decided to make a Codeforces round in honor of this!

The round will take place on Jul/13/2018 17:35 (Moscow time). There will be five problems for each division, three of them will coincide. The problems were made up by me and SirRembocodina, the contest was also prepared with the help of TeaPot, GrumpyKitten, mingaleg and niyaznigmatul. Thanks to demon1999 and winger for testing, our coordinator arsijo and, of course, MikeMirzayanov for Codeforces and Polygon platforms.

You can listen to the album by following the link:

It would be a great help if you repost us, even if you don't listen to this kind of music.

We will present an album on a CD to every contestant who expresses a wish. (If there are many of such, we will choose several of them with the best result in the round). Write me a private message.

Good luck on the contest!

UPD1. We will present an album on a CD to the top 10 contestants who would like to get one. Just send me a private message before the contest with your address, postal code and full name.

UPD2. Scoring distribution is as follows:
Div2: 500-1000-1500-2000-2500
Div1: 500-1000-1500-2250-2500

UPD3. We are still deciding if we should make this round rated or not. You can share your opinion about the round in the Mike's blog.

UPD4. We decided to sort the participants by the rating change. So the following users will receive a CD:
riela, +332
DongwonShin, +278
Erdenebayar, +176
DOlaBMOon, +148
Muhimin_Osim, +121
ciphereck, +117
Oliveira_medalha_de_ouro, +104
luismo, +94
zubec, +72
yagyanshbhatia, +70

UPD5. Congratulations to winners!

Div1:

  1. yosupo
  2. Egor
  3. fateice
  4. Um_nik
  5. ksun48
  6. wxh010910
  7. zemen
  8. 768092
  9. mareksom
  10. mmaxio

Div2:

  1. riela
  2. Kato_Megumi
  3. luis.trivelatto
  4. yukuai26
  5. Ddaji
  6. gls1196
  7. TaoSama
  8. chenyuqi0215
  9. CongLingDanPaiShang3k5
  10. Rena_Takeda

UPD6. The editorial was published!

 
 
 
 
  • Vote: I like it  
  • +859
  • Vote: I do not like it  

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11 days ago, # |
Rev. 3   Vote: I like it +17 Vote: I do not like it

cool name!!! SKYGLOW

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11 days ago, # |
Rev. 2   Vote: I like it -274 Vote: I do not like it

I'm sorry, but I think our music is better.

BTW, we released a new album yesterday, here's an MV: https://www.youtube.com/watch?v=Fm5iP0S1z9w

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    10 days ago, # ^ |
      Vote: I like it -21 Vote: I do not like it

    — My music is hit! — No, your is shit!

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      10 days ago, # ^ |
        Vote: I like it -105 Vote: I do not like it

      I know, it's so shit that it hit 20M views in 1 day :D

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        10 days ago, # ^ |
        Rev. 2   Vote: I like it +85 Vote: I do not like it

        So you came to PR on our contest? Sorry, I don't rate the quality of a song by the number of views, or else I end up listening to Justin Bieber.

        UPD: OK, now I see it is not even you, I am slowpoke. It's becuase you did not give the link in the beginning, so I thought you are really from a band.

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          10 days ago, # ^ |
            Vote: I like it -95 Vote: I do not like it

          You don't have to agree with me on how you rate songs or which song is better. I'm just saying that if there is a huge difference in the number of views, it suggests that one is more popular than the other :/ (aka more people think one is better)

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            10 days ago, # ^ |
            Rev. 2   Vote: I like it -48 Vote: I do not like it

            First, if many people think it is better it doesn't mean it is better. Second, how can you know what they think, did you ask them? They didn't even hear my songs, lol, how would they compare?

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              10 days ago, # ^ |
                Vote: I like it -26 Vote: I do not like it

              You're right, our music might not be better than yours.

              I'll just leave my comment as my personal opinion.

              Good luck gaining popularity then, I'm sure you guys will get millions of album purchases, considering how "[your] music is hit"!!!

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                10 days ago, # ^ |
                Rev. 2   Vote: I like it -41 Vote: I do not like it

                Check out subscribers of this channel and also views of each song and then the popularity of songs. You will realise "views" don't decide if the song is good or not.

                Sidenote: I like your music but comparing isn't the good thing.

                Edit: There was more song in the channel with 500k+ views but for some copyright issues were removed.

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                9 days ago, # ^ |
                  Vote: I like it +122 Vote: I do not like it

                In this thread: two musicians that are better than me at programming and at music arguing with each other... Coming from drastically different genres: death metal vs. K-pop. There is only one way to settle this...

                You guys should start a rap battle!

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              10 days ago, # ^ |
              Rev. 2   Vote: I like it +183 Vote: I do not like it

              SirRembocodina, if I were you, I would have simply ignored her comment :-) The more replies she gets, the more people will pay attention to her comment (and the more views she will get).

              It is your contest. You have worked hard to prepare it. You deserve more attention than anyone else.

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            10 days ago, # ^ |
              Vote: I like it -31 Vote: I do not like it
            1. different genres of music.
            2. the fact that you're comparing this 2 different songs means that you're *******.

            "I'm sorry, but I think our music is better."

            And by apologizing, you're not changing the fact that you just decided to boost your self-esteem by humiliating others. It's like saying sorry before you hit me. Sorry for my poor English.

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              10 days ago, # ^ |
                Vote: I like it -55 Vote: I do not like it

              What's wrong with comparing apples and oranges?

              I'm just stating my personal opinion, is there something wrong with that?

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                10 days ago, # ^ |
                Rev. 2   Vote: I like it -22 Vote: I do not like it

                If you want to state your personal opinion you should say like that, i think:

                I like our music more than your's.

                But you doing this another way:

                I'm sorry, but I think our music is better.

                So it ended up with confrontation, because you say that somebody have bad tastes in music if he listens to Skyglow's album.

                And to be honest you've done this just to PR. Another way you could act is to say and not make any cconflict:

                we too released new album yesterday, listen to it [link]

                But you can't say anything without negativity or sarcasm.

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

                  Did I ever say that people have bad tastes in music if they listen to Skyglow?

                  Yes, it seems like my comments sound a bit too sarcastic. I will definitely learn from you.

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        10 days ago, # ^ |
        Rev. 3   Vote: I like it -61 Vote: I do not like it

        for a country with population estimated to be 50m, and 20m hits for a music video?

        The reason would be heat but (supposedly) not the beat (no offense).

        Edit: OP's profile mentioned Taiwan and was confusing. But still its hard to believe on an average every 2 out of 5 saw video out of musical interest.

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          10 days ago, # ^ |
          Rev. 2   Vote: I like it -8 Vote: I do not like it

          Our group is actually from South Korea. And the audience isn't limited to one country.

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    10 days ago, # ^ |
      Vote: I like it +258 Vote: I do not like it

    You can get the best from both worlds by watching your video on mute while having SkyGlow playing in a separate tab!

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    10 days ago, # ^ |
      Vote: I like it +409 Vote: I do not like it

    Author is red, so his music is better.

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      9 days ago, # ^ |
        Vote: I like it +137 Vote: I do not like it

      Since correlation is that high, I'll try to convince Petr and tourist to start a new band:)

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        9 days ago, # ^ |
          Vote: I like it -20 Vote: I do not like it

        If you are able to convince them then the above comment would read as :
                           "Author is LGM ,so his music is AC"

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    10 days ago, # ^ |
    Rev. 2   Vote: I like it -26 Vote: I do not like it

    You guys are all wrong, AMERICAN music is the BEST IN THE WORLD

    Let me give you a taste of what TRUE music is like in the land of the free and the home of the brave: youtube.com/watch?v=dQw4w9WgXcQ

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      10 days ago, # ^ |
        Vote: I like it +20 Vote: I do not like it

      when u already memorized the last 3 characters of the rick roll

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    10 days ago, # ^ |
    Rev. 2   Vote: I like it -29 Vote: I do not like it

    whats wrong with this korean whamen ?

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    10 days ago, # ^ |
      Vote: I like it +50 Vote: I do not like it

    Twice is best

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

    Sorry to disturb,are you Ziyu Zhou herself?

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      10 days ago, # ^ |
        Vote: I like it +79 Vote: I do not like it

      Oh, you so naive darling, that is cf =)

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      9 days ago, # ^ |
      Rev. 2   Vote: I like it -12 Vote: I do not like it

      Sorry to disturb,are you rorshach himself?=) PS: that Rorshach in Watchmen right?

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

        I admit I'm just a naive pupil...Please go easy on me=)

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

          I am kidding. I am just glad to find a person who has read Watchmen. I don't mean anything else. By the way I like Rorshach too.

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

            Well, fine. I like Rorshach, and Watchmen is one of my favorite movie. Anyway, nice to meet you.(>_<)

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    10 days ago, # ^ |
      Vote: I like it +92 Vote: I do not like it

    I'm so shocked to see that 4 of the girls from Twice have CF accounts!

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      8 days ago, # ^ |
        Vote: I like it -25 Vote: I do not like it

      LMAO 0))0)), they're just fans of "TWICE"). Don't be shocked ))

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

    BTW https://www.youtube.com/watch?v=i0p1bmr0EmE is TOP! I and my sister are your huge fans now =)

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      9 days ago, # ^ |
        Vote: I like it -44 Vote: I do not like it

      It's good to see that our advertising plan, to a small extent, somehow worked!!!

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        9 days ago, # ^ |
          Vote: I like it -6 Vote: I do not like it

        If your purpose is to lower your contribution, Congratulations! Your plan worked out remarkably!

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          9 days ago, # ^ |
            Vote: I like it -21 Vote: I do not like it

          Thanks! I only planned to help advertise but I also got the benefit of having a low contribution. Perhaps I can beat I_LOVE_METSUKA :P

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            9 days ago, # ^ |
              Vote: I like it +35 Vote: I do not like it

            Lol it gets harder as your contribution gets lower.

            Also I just stopped trolling and actually trying to get better at CP instead.

            Hit me up when you have lower contribution than me tho. I will be CM at that moment.

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            9 days ago, # ^ |
              Vote: I like it -19 Vote: I do not like it

            Hey where did the downvoters go? I never said your jobs were done.

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            9 days ago, # ^ |
              Vote: I like it -6 Vote: I do not like it

            each your comment should have 1000 upvotes

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      8 days ago, # ^ |
        Vote: I like it +20 Vote: I do not like it

      Your comment gets upvotes )). It makes me laugh xD. If you would be green, I'm sure that your comment would get -100 ))

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10 days ago, # |
  Vote: I like it +45 Vote: I do not like it

I don't know why I get the feeling this contest will be nice! :)

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10 days ago, # |
  Vote: I like it -27 Vote: I do not like it

why there is no verdict called Contest Overflow ?

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10 days ago, # |
Rev. 3   Vote: I like it +48 Vote: I do not like it

That sounds so cool!

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    10 days ago, # ^ |
      Vote: I like it +16 Vote: I do not like it

    Lol, sorry, I downvoted your comment accidentally, and now everyone is downvoting it. This is how CF community works.

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      10 days ago, # ^ |
        Vote: I like it +47 Vote: I do not like it

      Nevermind,we are not the creature live on "up-vote" XD.

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      10 days ago, # ^ |
        Vote: I like it +47 Vote: I do not like it

      it's because master votes are worth many multiple points (more than 5 at least), not because others have also downvoted

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10 days ago, # |
  Vote: I like it +50 Vote: I do not like it

Wow! This is cool, a death metal band is organizing a contest. I think this round is going to be great.

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

I think it will be a musical contest....

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10 days ago, # |
  Vote: I like it -81 Vote: I do not like it

Is it rated???

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10 days ago, # |
  Vote: I like it +35 Vote: I do not like it

It happens that I'm a big Fan Of Death Metal !!!!! I'll listen your release, and I'll try not to miss the contest. I have to say that for the first time my two passions in life meet !!!

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10 days ago, # |
  Vote: I like it -63 Vote: I do not like it

it feels good to downvote every comment :)

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

Oh so good contest about music :D

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    10 days ago, # ^ |
      Vote: I like it +42 Vote: I do not like it

    The problems won't be about music, actually. It will be a regular contest without particular theme, just with good problems :)

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10 days ago, # |
  Vote: I like it +8 Vote: I do not like it

Programmers, programmers everywhere...

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

I don't know if it's a joke or not, but you guys might be the coolest people here on cf.

A death metal band? Damn

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

    exactly.. You guys are soo damn awesomeee.... (Music+Code)..

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

I'm confused, is the music promoting the contest or the contest promoting the music? xD

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

okay , I am really hyped now <3 , a contest by death metal guys, and by the way , I liked Sacred Self-Deceit , especially the start , will listen to others soon :) ,

However , please dont put any music related legend / stories , once I had a really bad experience with a topcoder problem with music analogies , it does not makes sense to people who never made music , or dont know any instrument..

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

Hoping questions on lyrics, rhyming words and drums.
You guys are geeky metal band players... you are Fan... wait for it...tastic !!.

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10 days ago, # |
Rev. 2   Vote: I like it -6 Vote: I do not like it

This is definitely going to be a good contest. Will be listening to your music while participating. :)

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

I don't usually listen to this kind, but I got to say I really LOVED the music you are using, wish you all the best :D

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

if you want have a good contest maybe you need to listen to skyglow's musics

...And the Circle Closed ( problem A ) A New Age ( problem B ) Sacred Self-Deceit ( problem C ) Limitless Fog of Anguish ( problem D ) Losing Humanity ( problem E ) Thousand Years of Terror ( problem F if we have problem F :P )

( Have you another comment ? :) )

if you'r time and you'r feelings fits with songs, you will have good contest Good luck ! ;D

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

Really nice album art !!! Good taste in music too. Best of luck for your band :) Hope this round will be an interesting one .

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

Wow! How do you manage being a programming grandmaster and being in a band at the same time ?

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10 days ago, # |
  Vote: I like it +194 Vote: I do not like it

Friday 13th looks like a perfect day for a contest from a metal band.

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

my love for the album is based on my rating in this contest :"D

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

I wish to not be sent a CD :)

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

Nice album. Seems like Edge of Sanity/(old)Arch Enemy in a more progressive and faster way.

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

nice music :D

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10 days ago, # |
  Vote: I like it +8 Vote: I do not like it

The album is just in my favorite style. :) Hope it will be very famous soon! :D And I think I can have a fun time during this contest!

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

Authors music is as sharp as his coding skills.....

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10 days ago, # |
  Vote: I like it -40 Vote: I do not like it

?detaR tI sI

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10 days ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

Good song. Enjoyed :)

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

I hope it is not a mathforces.

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    10 days ago, # ^ |
      Vote: I like it +70 Vote: I do not like it

    nor a hackforces...

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

      This round sure did feel like hackforces after all...

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        7 days ago, # ^ |
          Vote: I like it -6 Vote: I do not like it

        but it's mathforces(div1b),interactiveforces(div1c) and datastructureforces(div1d)

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

I hope we don't have to code lyrics

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

Congratulations on your first album, Skyglow!

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

a Chinese word "New Be" is able to describe this

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10 days ago, # |
  Vote: I like it +32 Vote: I do not like it

MusicForces Round?

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

if I bought your album, could I be expert?

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10 days ago, # |
  Vote: I like it +24 Vote: I do not like it

Wow, I personally prefer clean singing, but this songs are really good. The riffs in "Thousand Years of terror", "...And the circle closed" and "The limitless Fog" are just awesome. Hope the problems be as nice.

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10 days ago, # |
  Vote: I like it +6 Vote: I do not like it

By the way, both 500th Codeforces round and 50th educational round will be held quite soon. Sounds like a big anniversary for Codeforces. I wonder, whether it will be something special. Personally, i hope that there will be 500 T-shirts for top 500 participants xdxd. Or at least 100)

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    9 days ago, # ^ |
      Vote: I like it -12 Vote: I do not like it

    Codeforces did not give prizes for (Div. 2 only) contests. At least from the day I joined (1 year ago). But I hope they do.

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

It's so interesting ,Good luck

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10 days ago, # |
  Vote: I like it +43 Vote: I do not like it

Are there programming contest related songs in the album?

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    10 days ago, # ^ |
    Rev. 3   Vote: I like it +114 Vote: I do not like it

    Yes, of course, in fact every song from the album is a subtle metaphor about a programming contest

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

This album is too tough for me. But the fact that programmers not only good in math and computations, they are also good in writing music, writing own lyrics, knowing the history makes this album super cool. I've red whole lyrics and I feel like I went throgh the Russian history. Thanks guys.

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10 days ago, # |
Rev. 4   Vote: I like it +13 Vote: I do not like it

Are there any hints in your album?)

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

That's a preeeettty lucky day for a contest

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10 days ago, # |
Rev. 2   Vote: I like it -40 Vote: I do not like it

I should be careful now so that I won't get any downvotes.

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    10 days ago, # ^ |
      Vote: I like it -44 Vote: I do not like it

    Competitive programming interview questions? Are you applying for codeforces or something?

    Lol what did you just say? read up about algorithms, and data structure, then you can call stuff by their name, and have an actual chance of passing these interviews.

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

      What's wrong with competitive programming :( But yeah that first post is advertising, it doesn't belong on this blog...

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9 days ago, # |
  Vote: I like it -32 Vote: I do not like it

i found my twin with down votes .. tzuyu_chou

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9 days ago, # |
  Vote: I like it +13 Vote: I do not like it

I was always interested in how do you choose amont all authors of the contest the one who will post the announcement. The one with lower contribution? Or simply by tossing the coin? How it is done generally and how it was done in this round?)

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    9 days ago, # ^ |
      Vote: I like it +70 Vote: I do not like it

    We chose the red one, of course, people love reds. But really, SirShokoladina worked on the contest the most.

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9 days ago, # |
  Vote: I like it +84 Vote: I do not like it

Can you guys please do a Despacito cover?

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9 days ago, # |
  Vote: I like it +16 Vote: I do not like it

I wish to have a CD. How can I get one ?

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9 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Auto comment: topic has been updated by SirShokoladina (previous revision, new revision, compare).

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9 days ago, # |
  Vote: I like it -30 Vote: I do not like it

tzuyu_chou Honestly, it was really a smart way to advertise. I couldn't resist me from watching it. And it's good.

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

    Wow, I might get a salary boost because of this! Thanks for letting me know.

    P.S. I learned this advertising trick from JYP. Go on forums and make sure your comments get either a lot of upvotes or a lot downvotes, as that will attract a lot of attention!

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9 days ago, # |
  Vote: I like it +4 Vote: I do not like it

Probably all Red coders will get the CD '_^

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9 days ago, # |
  Vote: I like it -6 Vote: I do not like it

Lucky/Unlucky 13 :P

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9 days ago, # |
  Vote: I like it -39 Vote: I do not like it

If I win a CD I will donate it, and if I do not find one, I will destroy it..

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9 days ago, # |
  Vote: I like it +1 Vote: I do not like it

Here is a challenge:

Compete in this contest, while listening to some death metal music :P

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    9 days ago, # ^ |
      Vote: I like it +6 Vote: I do not like it

    That actually improves your performance, Prog metal is much harder to listen to but it has the same effect (even better) if you get used to it (at least for me). So here's a harder challenge : try listening to some Dream Theater during the contest, see how much can you take. (start with Dance of Eternity)

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      8 days ago, # ^ |
        Vote: I like it +11 Vote: I do not like it

      I am also a prog fan, but never thought about it....

      it looks like you are a real PROGrammer :P

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

      Does it work with Fates Warning as well?? You know I love Dream Theater too, but I prefer Fates Warning, Skyglow here has a lot of progressive too. For me Death-Metal works better, or in a more general sense Extreme-Metal. Is nice to find Metal Fanse here. By the way your nickname is a Masterpiece if you know what I mean.

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

        It works with whatever you like. and sure, Powerslave is one of the best metal albums ever. Iron Maidens is a God to me.

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

          Seventh Son Of The Seventh Son is my favorite Maiden album, I wish I could watch them play it alive someday

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

    Actually I did, but not just Skyglow, there was som Emperor, Annihilator, Amorphis and some more stuff on the playlist. Although I have to add, the I only listen Metal while I'm not focusing on hard problems, you might guess that my playlist stopped at minute 27 when I AC problem C :P

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9 days ago, # |
  Vote: I like it +151 Vote: I do not like it

So cool, you guys!!!

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8 days ago, # |
  Vote: I like it +29 Vote: I do not like it

That actually quite nice. Didn't expect to actually enjoy it because I usually hate the screaming. The musical accompaniment kinda reminded me of the whole Touhou metal variation culture that I'm very fond of :)

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

    Losing Humanity has some clean voices, for me is the best song of the album.

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8 days ago, # |
  Vote: I like it +18 Vote: I do not like it

Wow, if it comes to music, there are many well talented people on CF. budro, fast, it's your time to shine!

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8 days ago, # |
  Vote: I like it -19 Vote: I do not like it

What you'd say about sending CDs to people who solve only problems C and D, apart from the top10 criterion? SirShokoladina

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    8 days ago, # ^ |
    Rev. 4   Vote: I like it +11 Vote: I do not like it

    Not many people would want to receive a CD. I don't want to waste CDs on people who don't want them. Besides we can only send 10 CDs. Also I want every contestant to be able to win a CD, not only reds and yellows.

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8 days ago, # |
  Vote: I like it -8 Vote: I do not like it

What's wrong with tourist's contribution ?

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8 days ago, # |
  Vote: I like it +27 Vote: I do not like it

Probably the first blog after Tourist's "Hello 2018" with this much appreciation.Hope the participation would see similar levels.

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8 days ago, # |
  Vote: I like it +33 Vote: I do not like it

This is the most use of odd time signatures I've seen since Meshuggah and perhaps Tool. Definitely feels like the songs are written by a red coder.

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    8 days ago, # ^ |
      Vote: I like it +15 Vote: I do not like it

    Ha-ha, thank you! Yellow, actually. I am glad someone marked this feature.

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8 days ago, # |
Rev. 3   Vote: I like it +12 Vote: I do not like it

Really liked the song "Losing Humanity".

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8 days ago, # |
  Vote: I like it +26 Vote: I do not like it

OMG! 1000 upvotes! Congratulations!!

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8 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Auto comment: topic has been updated by SirShokoladina (previous revision, new revision, compare).

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8 days ago, # |
  Vote: I like it +10 Vote: I do not like it

Your album is an amazing for people who love listening metal! You helped me to update my playlist)

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8 days ago, # |
  Vote: I like it -22 Vote: I do not like it

I think this announcement has greatest Upvotes :)

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8 days ago, # |
  Vote: I like it 0 Vote: I do not like it

That's great you're gathering success as music band! I'd like to appreciate your work but I kind of hate music, so maybe you can record few minutes of complete silence, so I can actually enjoy one of your tracks?

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8 days ago, # |
  Vote: I like it -19 Vote: I do not like it

A CF on Friday the 13th, May the Gods be on our sides...

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8 days ago, # |
  Vote: I like it +5 Vote: I do not like it

I will try to become expert in this contest. :)

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8 days ago, # |
  Vote: I like it 0 Vote: I do not like it

D is very difficult :(

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8 days ago, # |
Rev. 3   Vote: I like it +3 Vote: I do not like it

Typing contest because of Div2-D

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

C is like 1250 while D is like at least 2750.

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8 days ago, # |
  Vote: I like it 0 Vote: I do not like it

A,B,C,D all had some typing/explanation problems. what about D?

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8 days ago, # |
  Vote: I like it +16 Vote: I do not like it

unbalanced problemset

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8 days ago, # |
  Vote: I like it +36 Vote: I do not like it

problem A is simple but hard to read it Wrong Description (10 20 30 40 -> 20 30 40 10) ans = 3 not 2 Somebody submit solution late because of it and have low rank in problem A problem B is very difficult Why not call it CodeSpeed round ?

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    8 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Yeah you r right i was confused too at first sight

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      8 days ago, # ^ |
        Vote: I like it +17 Vote: I do not like it

      I think it's very frustrating to get a lower rating because of unbalanced problems and wrong descriptions

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

        Wrong description is truly embarrassing but unbalanced problems, is not the case always, so for someone really trying to work hard on problem solving will surely have a good time.

        A side note, I also see my rating going down in today's contest, but hell, loved the fifth question. Really enjoyed the contest.

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8 days ago, # |
  Vote: I like it +15 Vote: I do not like it

Problem statements are not clear and difficulty difference between C and D is huge.Lots of announcements.

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

With 1 hour into the contest and no AC solution to D and E (Div.2), one thing can be said for sure that this round was just about fast solving A, B and C. Surely, this contest was way below my expectation, specially after the cool music theme and 1000+ upvotes on announcement :(

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    8 days ago, # ^ |
      Vote: I like it +19 Vote: I do not like it

    "All that glitters is not gold."

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    7 days ago, # ^ |
      Vote: I like it +22 Vote: I do not like it

    This is why I never vote on a contest announcement until I've seen the problems.

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8 days ago, # |
  Vote: I like it +2 Vote: I do not like it

Wake me up when someone solves D in div2 :P

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8 days ago, # |
  Vote: I like it +50 Vote: I do not like it

Sorry this contest put me on team K-Pop

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

    Looking at how people are reacting to this contest, it is obvious that their main purpose of preparing this contest was to promote their music. Not that I could actually write any problems (much less prepare a contest), but they should've just not wasted 2 hours for many people.

    My advertising, on the other hand, only wastes a few seconds, as it just requires people to look at my comments and downvote them.

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8 days ago, # |
  Vote: I like it +54 Vote: I do not like it

Really bad problem set...

  1. Problem statements very unclear.

  2. A, B, C — very easy, thus typing speed checking contest.

  3. D, E are way out of league for Div2 users.

Solve problem D in Div2 and you'll be a CM.

Also I usually save my vote for the announcement and give my vote only after seeing the problem set. I give you a downvote SirShokoladina.

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    7 days ago, # ^ |
      Vote: I like it +42 Vote: I do not like it

    Or, Solve problem B in div1 and become Master.

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8 days ago, # |
Rev. 3   Vote: I like it +104 Vote: I do not like it

At least i tried

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    8 days ago, # ^ |
      Vote: I like it +17 Vote: I do not like it

    I solved A B C in 17 minutes and read statements of problem D. Now I can't still understand what D is saying.

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

      Lucky you, I'm still at the first sentence in D

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8 days ago, # |
  Vote: I like it +69 Vote: I do not like it

You may be good at singing but you're definitely not good at preparing a contest.

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

Too bad I already have up-voted your blog and I can't down-vote it now!

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    7 days ago, # ^ |
      Vote: I like it +23 Vote: I do not like it

    thats why i never upvote before contest.

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7 days ago, # |
Rev. 2   Vote: I like it +32 Vote: I do not like it

Is it the first contest in history of CF which has had an announcement for an (wrong) announcement?

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    7 days ago, # ^ |
      Vote: I like it +69 Vote: I do not like it

    Yes, my bad this time. Sorry about it.

    See, arsijo only learns to be a coordinator. Sorry for unclearness in some statements and disbalance in difficulties, we will work on it!

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

      oh I'm sorry. Didn't wanna bother you. As long as so many rounds are coming one after the other, I'm grateful to you and CF. Mistakes are totally okay.(I guess).

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

      I think the contest should be rated because mistakes happens in any contest and it was just a problem has mistake but all other problems were fine

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

It is not normal when nearly 3000 people solve ABC so fast and so few people solve D or E. I believe that next time problemsetters will be more careful with tasks.

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

Why would the round be extended for 10 minutes?

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    7 days ago, # ^ |
    Rev. 3   Vote: I like it +39 Vote: I do not like it

    So we can finish with reading last two problems

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

      maybe we have more time to hack!

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

        maybe to decrease the difference between the number of submissions of C and D!

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        7 days ago, # ^ |
        Rev. 2   Vote: I like it +1 Vote: I do not like it

        Maybe we have more time to get Unsuccessful hacking attempt back :(

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

)

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

They focussed more on promoting their music instead of preparing problems for this round.

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

Kind of the worst Codeforces Round, but, hey, at least you tried!

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7 days ago, # |
  Vote: I like it +68 Vote: I do not like it

The extension will only extend my suffering

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

For Div. 2:

hack

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7 days ago, # |
  Vote: I like it +31 Vote: I do not like it

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

Much difference between expectation and reality..

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

Solve [D]

Runtime error

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7 days ago, # |
Rev. 4   Vote: I like it +5 Vote: I do not like it

What's intended complexity for Div1B?

I had log(#divisors)*(#divisors) per query but with huge constant so didn't pass

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

    still 5 mins remaining for the contest to end!

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    7 days ago, # ^ |
    Rev. 3   Vote: I like it 0 Vote: I do not like it

    I have O(1) per query (more honest — O((2k)k * 2k) where k is number of dimensions, k = 3 for this problem).

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

      Can you please explain your approach for the problem!

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

        I would like if someone explain my approach to me, actually...

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

    My solution is O(1) per query.

    Calculate A[i] = number of divisors in mask i for the venn diagram (https://en.wikipedia.org/wiki/Venn_diagram) of the divisors and do a bruteforce on the possible combinations of areas from it. Turns out there are 51 possible combinations of areas for it so you can just precalculate them and pass through them doing simple combinatory.

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7 days ago, # |
  Vote: I like it +37 Vote: I do not like it

A contest with announcement on every problem. Announcementforces round

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

The div2 round is completely a garbage. The problem DE in nearly unsolvable, while ABC are div4 problems. The pretest contains only examples. I cannot complain more.

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

This is the longest Announcement list I've seen so far!

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7 days ago, # |
  Vote: I like it +127 Vote: I do not like it

I think kai9 is cheating

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

This contest should be unrated.

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

Disappointed.

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7 days ago, # |
Rev. 4   Vote: I like it +3 Vote: I do not like it

Almost O(N^2) solution passes for problem C! 40274533 Tried to hack it with this test and it still passed in 1.5s

    int N = 100000;
    cout<<N<<endl;
    for(int i = 0;i<N/2;i++)
        cout<<1<<" ";
    for(int j = N/2;j<N;j++) {
        cout<<2;
        if( j != N-1)
            cout<<" ";
    }

That really doesn't make sense to give 2s for such a problem!

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    7 days ago, # ^ |
      Vote: I like it +23 Vote: I do not like it

    Passed the pretests doesnt mean it passes the system tests

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

      I meant for this hack test it still passed in 1.5s that's why I'm saying 2s is too much for this problem cuz such solutions will pass

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

        generally, pretests include small test cases and for these tests maybe 1.5s is expected for that hack.

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

    Maybe pretest doesn't include this test case.

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7 days ago, # |
  Vote: I like it +143 Vote: I do not like it

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7 days ago, # |
  Vote: I like it -14 Vote: I do not like it

Semi-rated?

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

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

How to solve Div.1 C?

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7 days ago, # |
  Vote: I like it -42 Vote: I do not like it

That was pure shit!

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

Very Hard C, D, E!

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7 days ago, # |
  Vote: I like it +32 Vote: I do not like it

The most difficult problemset of div1 I've ever seen!

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7 days ago, # |
Rev. 3   Vote: I like it 0 Vote: I do not like it

My logic in Div2 D.

Sort the 3 numbers A,B,C. Get all factors of A, B and C in a sorted order. For each factor of B[i] find number of factors of A less than or equal to B[i] and number of factors of C greater than or equal to B[i] using binary search.

Then multiply these two numbers and add to ans.

But got WA in test case 3. How can I modify this to get AC or this is a wrong logic (I am probably not counting all triplets) ?

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

    this is rather wrong logic

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

      For paving we have to make sure the corresponding dimension of the smaller parallelepiped divides the corresponding dimension of the bigger parallelepiped right? This is why I used factors and then to make sure a<=b<=c I used the binary search.

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

        "the corresponding dimension of the smaller parallelepiped divides the corresponding dimension of the bigger parallelepiped"

        I think the problem is in this assumption. Since you can rotate the smaller parallelepiped, the numbers a <= b <= c don't necessarily divide A, B and C in that order, for example you could have: 'a' divides C, 'b' divides A and 'c' divides B. The statement in fact contains one example of this, saying that a 1x5x6 block can be divided into 1x3x5 parallelepipeds (1 divides 1, 3 divides 6, 5 divides 5).

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

    Two clearest things to point out: your answer might consists of duplicate pairs, also not only divisors of B can be at the middle regarding numbers' absolute values.

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7 days ago, # |
Rev. 2   Vote: I like it +27 Vote: I do not like it

Not "the first" in everything turns out good, actually.

I appreciate your work (both music and CP, though I'm not a huge fan of Death Metal anyway xD); however this contest has some issues. Most known are D1B/D2D incomprehensibility and its spike over easier tasks (haven't read D1C and above, so I can't comment further xD).

Also, having a lot of additional announcements is something not so nice. You might consider simulating yourself in more varied perspectives so that you can have a wider overview of what being clear and what being vague ;)

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

for div1B, what is the correct output for 6 10 15

it is 50, right? edit nvm I'm wrong its 51

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

    My AC code gives 51. Now I'm scared.

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

    it's 51, my bruteforce says

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

    This gives 51:


    int brute(int a, int b, int c) { set<vector<int>> s; for (int i=1; i<=a; i++) for (int j=1; j<=b; j++) for (int k=1; k<=c; k++) { if (a%i == 0 && b%j == 0 && c%k == 0) { vector<int> v = {i, j, k}; sort(v.begin(), v.end()); s.insert(v); } } return s.size(); }
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    7 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    51 obviously

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

Ok, something weird happened to me on C.

I had Idleness Limit Exceeded with one program. Then I added an assert to two places and got RTE, so the assert is obviously the reason for RTE. That's all well possible, but then I took the code with asserts, hardwired "choose random a and b initially" and a checker oracle "choose a random true answer" instead of I/O. And stresstested with tens of thousands of tests, various random and non-random N. The assert is never triggered.

Is there a bug in the checker? In my hardwired checker? Does my code fail on a strange corner case (specifically: on pretest 1)? Something else?

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

    i saw your solution. it runs into an infinite loop on the sample

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

      I know where I made a mistake after going though the sequence of expected answers now... It has nothing to do with any of my thoughts during the contest, I mentally reversed the inequalities in answers (answer 1: the correct number is smaller than the queried number).

      What a shitty mistake. The worst thing is that there was no way for me not to make that mistake — when I read x < a, my mind automatically goes to "meaning of random letters: the true number is on the left and the queried number is on the right" because it's the natural notation for me and that's precisely why I can't realise that's wrong too... if it wasn't a, b and x, y but something like qa, qb, I'd probably notice.

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        7 days ago, # ^ |
        Rev. 2   Vote: I like it +18 Vote: I do not like it

        Yeah, I agree, I also made this mistake but luckily caught it when trying to run the samples by hand.

        I think it would have been better if x and a were replaced by words, for example "the x-value Vitya guessed", "the x-value Vasya is thinking of".

        (okay that doesn't sound that good, but I'm sure there is a better alternative.)

        EDIT: better alternative in comment by Xellos

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          7 days ago, # ^ |
          Rev. 2   Vote: I like it +10 Vote: I do not like it

          +1

          I had to stop ~15 times for a second and think again what the condition means (which side/way it is).

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

          v1, v2 and q1, q2 would be fine. Variable names being self-explanatory also means there's no need for a tl;dr explanation.

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

        I agree. The notation was confusing :(

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

    the interactor is determinate, so it gave you the same answer each time.

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

How to solve div-2 D or E?

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7 days ago, # |
  Vote: I like it +2 Vote: I do not like it

ecnerwala are you guys streaming today?

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

    No, we're busy after the contests on weekdays. We'll try to stream most of the weekend contests though!

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

Let's start a really long discussion now. I was able to solve div 2 B using simple O(n) implementation here but looking at the round I am still not sure if it'll pass the system tests or not. I solved div 2 A after somehow understanding the problem but my solution got hacked. I still don't know why test case of "nz" should print "NO". My submission is here

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

    There is no vowel after z thats why

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

    Because there is no vowel after z

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

    Good news for D2B — your greedy O(n) solution is correct! :D

    P/s: I solved B that way as well ;)

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

      yay! finally something good happened in last 2 hours for me!

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7 days ago, # |
  Vote: I like it +79 Vote: I do not like it

Hello kai9 can you explain this?

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

    We can wait for kai9 's response

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    7 days ago, # ^ |
    Rev. 4   Vote: I like it +31 Vote: I do not like it

    I think that kai9 has two (or more) codeforces accounts, and he just register with all of them in the contest, and by chance he's in the same room with one of this accounts, so he hack himself 9 times :) you can observe that the solution of kai9 and the the solution of Eagle-EYe have the same header ;)

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

    fkkkkkkk what i see

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

    Funny,he's in the same room as mine. And I see how he hacked Eagle-EYe's. At first, I sympathize with Eagle-EYe's very much, until I view his code..= =

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

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

I don't care if I get downvoted. This was one of the worst Div-2 contests I have participated in.

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7 days ago, # |
  Vote: I like it +27 Vote: I do not like it

Contest is hard and very bad.

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7 days ago, # |
Rev. 2   Vote: I like it +21 Vote: I do not like it

Is the title and the description of div2 D incorrect? I still didn't understand the problem.

Pave: cover (a piece of ground) with concrete, asphalt, stones, or bricks; lay paving over.

What does it mean to pave a parallelepiped?

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    7 days ago, # ^ |
    Rev. 2   Vote: I like it +19 Vote: I do not like it

    The problem asked you to count the numbers of (a, b, c) (a <= b <= c), such that (a, b, c) are divisors of (A, B, C) or (A, C, B) or (B, A, C) or (B, C, A) or (C, A, B) or (C, B, A), respectively.

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

      So parallelepipeds (A, B, C) is the same as (A, C, B) but rotated? [I think rotating (A, B, C), where (A != B; B != C; A != C) won't produce (A, C, B)] (1×5×6 can be divided into parallelepipeds 1×3×5) but this tells me I'm wrong.

      Or maybe its even more complicated than that?

      I was thinking about it a bit, but probably am just wrong or misunderstood sth.

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

    just think of it as a 3d rectangle, a box. Then "to pave" means "to fill it" so it's full. You can fill a 3x3x3 box with 27 1x1x1 boxes, or with 3 1x3x3 boxes, or 3 3x1x3 boxes, etc. Note that, in the task, you can only use boxes AxBxC that are A <= B <= C, but rotation is allowed, so a 9x1x1 box can be filled with boxes of 1x1x3.

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

Please make the round unrated for those who got "Idleness limit exceeded" in Problem C because of sending too many requests.

It was explicitly stated in the statement that sending too many requests leads to "Wrong Answer" and printing nothing or forgetting to flush the output leads to "Idleness limit exceeded".

It wasn't until almost the end of the contest that the correction was made.

Some contestants may have spent huge amount of time looking for errors in their code that matched the verdict("Idleness limit exceeded")and couldn't find any mistake related to I/O and therefore couldn't compete in the contest normally.

Please look into the issue.

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

    Im afraid that you div1 public commenting by fake account. afraid of downvote :p ?

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

      I don't see how downvotes matter? (other than it makes the comment hidden — which will also happen from the the fake account)

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

      I think many share the same trouble during the contest so I don't want to make this only about myself.

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

    It happened to me, but then again I could not have solved D anyway and A,B and C were done. So I can't complain. But I do consider that it would have been the case with Div 1 users.

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7 days ago, # |
Rev. 4   Vote: I like it -10 Vote: I do not like it

Hoping for a contest with less math soon

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

    Agreed. But CF is famous for its math tasks, and many people like that?

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    7 days ago, # ^ |
      Vote: I like it +2 Vote: I do not like it

    one should enjoy maths problems .

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

      If only your target is to learn math deeply. I enjoy programming and involvement of mathematic observation but pure hard math annoy me because I dont know much.

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        7 days ago, # ^ |
          Vote: I like it -8 Vote: I do not like it

        then when will you learn new and hard things ?

        hope you know many red coders are either imo medalists or won some medals in prestigious maths competition !

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

          But point is we newbie public are not medalist :p we want to learn data structure, graph, string and various algorithm. Many of us not willing to compete in IMO.

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

Although div1B was way harder than ussual, I really liked it, actually, thanks.

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7 days ago, # |
  Vote: I like it -10 Vote: I do not like it

Why does this solution doesn't work for E? I first guessed the value for x, once I get that, I guess for value of y. I don't think this will exceed 600 requests. What am I missing here? anyone?

from sys import stdout

n = int(input())
lox = 1
loy = 1
hix = n
hiy = n
x = (lox + hix) // 2
y = 1
cnt2 = 0

# Get correct value of x
while True:
    print(x, y)
    stdout.flush()

    ans = input()
    if ans == "0":
        break
    if ans == "1":
        lox = x + 1
    elif ans == "3":
        hix = x - 1
    if ans == "2":
        cnt2 += 1
    else:
        cnt2 = 0
    if cnt2 > 10:
        break  # this suggest we got x right
    x = (lox + hix) // 2

# Get correct value of y
while True:
    print(x, y)
    stdout.flush()

    ans = input()
    if ans == "0":
        break
    elif ans == "2":
        loy = y + 1
    elif ans == "3":
        hiy = y - 1
    y = (loy + hiy) // 2
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    7 days ago, # ^ |
      Vote: I like it +11 Vote: I do not like it

    You should probably put your code in a spoiler tag before the downvotes come (also it's neater)

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

      I tried to do that, the dropdown just doesn't appear. It's like the drop-down to select spoiler is hidden behind the text box.

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

    "this suggest we got x right" — but it doesn't mean that.

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

      I mean, if the response is random for the case when more than one condition satisfies, then it fails with probability — 1/1024. What if I increase the threshold for cnt2?

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

    The interactor can just keep printing out '2', indicating that your y value is less than the target, and you'll never find the correct x value. When you input '2' while searching for x value, you don't change your outputted query at all, and the interactor is free to keep outputting '2' regardless of the correctness of your x value.

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

      Thanks, my mistake. I assumed that in case of multiple conditions is true, the interactor's output is random.

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

Very unbalanced contest. C solved by 3000, D by 21? Was it difficult to predict when making problem set...

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

    Wait for the system test and you will find out that the number of solutions for C is far smaller