Ari's blog

By Ari, 6 weeks ago, In English,

Hi!

On Jul/04/2020 17:45 (Moscow time) we will host Codeforces Global Round 9.

It is the third round of a 2020 series of Codeforces Global Rounds. The rounds are open and rated for everybody.

The prizes for this round:

  • 30 best participants get a t-shirt.
  • 20 t-shirts are randomly distributed among those with ranks between 31 and 500, inclusive.

The prizes for the 6-round series in 2020:

  • In each round top-100 participants get points according to the table.
  • The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
  • The best 20 participants over all series get sweatshirts and place certificates.

Thanks to XTX, which in 2020 supported the global rounds initiative!

The problems of this round were prepared by a team of authors: adamant, antontrygubO_o, Ari, dengyaotriangle, hugopm, Kuroni, MrDecomposition, and Ynoi. We would like to thank the following people:

You will be given 2 hours and 30 minutes to solve 9 problems, and we highly encourage you to read all of them :)

To save testers the work of writing their opinion in the comments, we have compiled some of their opinions for them!

Round Feedback

Good luck!

UPD: Score distribution:

500 — 750 — 1500 — 1750 — 2000 — 2000 — 2250 — 2750 — 4000

UPD2: Editorial

UPD3: System tests have finished, congratulations to the winners!

  1. tourist
  2. scott_wu
  3. yosupo
  4. Um_nik
  5. tEMMIE.w.
  6. lqs2015
  7. heno239
  8. Motarack
  9. zeronumber
  10. ltst
Announcement of Codeforces Global Round 9
 
 
 
 
  • Vote: I like it
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6 weeks ago, # |
  Vote: I like it +3388 Vote: I do not like it

As a tester, give me contribution.

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    6 weeks ago, # ^ |
      Vote: I like it +49 Vote: I do not like it

    You are so honest. Otherwise, most of time tester tries to gain contributions by just commenting something shit....

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      6 weeks ago, # ^ |
        Vote: I like it +415 Vote: I do not like it
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        6 weeks ago, # ^ |
          Vote: I like it +140 Vote: I do not like it

        Now, this is the most upvoted comment after Is it rated?
        Full List

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          6 weeks ago, # ^ |
            Vote: I like it +26 Vote: I do not like it

          so let's make it the most upvoted comment.

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            6 weeks ago, # ^ |
              Vote: I like it +18 Vote: I do not like it

            Now it became the most upvoted one. :)

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              6 weeks ago, # ^ |
                Vote: I like it +43 Vote: I do not like it

              I'm so jealous =P.

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

                U should be happy about it that the testers are getting more attention than the problem setters. :=)

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              5 weeks ago, # ^ |
                Vote: I like it +26 Vote: I do not like it

              Everything is good and all but

              what's up with your handle Anus1373

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            6 weeks ago, # ^ |
              Vote: I like it +69 Vote: I do not like it

            It is now the most upvoted comment !!1!!1!

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          5 weeks ago, # ^ |
          Rev. 2   Vote: I like it +108 Vote: I do not like it

           The comment has more upvotes than the blog.

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            5 weeks ago, # ^ |
              Vote: I like it 0 Vote: I do not like it

            People had given priority to Comment rather than taking part in Contest. Haha :=)

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    6 weeks ago, # ^ |
      Vote: I like it +177 Vote: I do not like it

    The only thing I remember about Monogon is that his first ever contest after being such a beauty was ruined due to long queues and finally the round became unrated. Awaiting another round from you.

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    6 weeks ago, # ^ |
      Vote: I like it +6 Vote: I do not like it
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    6 weeks ago, # ^ |
    Rev. 2   Vote: I like it -16 Vote: I do not like it

    Sorry for that..

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    6 weeks ago, # ^ |
      Vote: I like it +26 Vote: I do not like it

    You are now in top 10 contributors. Cong!!

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    6 weeks ago, # ^ |
      Vote: I like it +29 Vote: I do not like it

    may be for the first time a tester is going to get more contribution than the setter xd
    need 247 more only :P

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    6 weeks ago, # ^ |
      Vote: I like it +30 Vote: I do not like it

    The most upvoted comment ever?

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    6 weeks ago, # ^ |
      Vote: I like it +14 Vote: I do not like it

    If only herd immunity was as easy as herd behaviour...... P.S. you have my vote.....

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    5 weeks ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    I hope monogon prepares a round after gaining such support from the community. We will try to make the contest announcement blog the most upvoted blog on CF.

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    5 weeks ago, # ^ |
      Vote: I like it -10 Vote: I do not like it

    You have it, >2000 upvotes :D.

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    5 weeks ago, # ^ |
      Vote: I like it +251 Vote: I do not like it

    As the most upvoted comment in history, I think this proves that the greedy works.

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      Did you by any chance started recording and got trolled by Codeforces! Leave it unedited!! If you are going to edit then release it as a blooper! LoL

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    5 weeks ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Damn! Even, most of the "contest announcement" blogs have less upvotes.

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

    Would it break the tourist's global round 5 record?

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

    This has to be a record of some kind.

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    5 weeks ago, # ^ |
      Vote: I like it -17 Vote: I do not like it

    neta neta har koi kheta teesri manjil pe rehta!

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    3 weeks ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Can monogon's comment beat tourist's rating someday? =O

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6 weeks ago, # |
  Vote: I like it +125 Vote: I do not like it

AC Round #3

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

    What is AC Round ?

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      6 weeks ago, # ^ |
        Vote: I like it +94 Vote: I do not like it

      AC is a discord server for competitive programmers. Most of the authors/testers of this round are members of the server. This is the third round made by AC members, here and here are the first two rounds.

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6 weeks ago, # |
  Vote: I like it +208 Vote: I do not like it

This has to be one of the best contest announcement.

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6 weeks ago, # |
  Vote: I like it +25 Vote: I do not like it

I am not tester, but i strictly reccomend you to participate in this contest!

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6 weeks ago, # |
  Vote: I like it -60 Vote: I do not like it

I'm a tester, and this round is very good.

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6 weeks ago, # |
  Vote: I like it +119 Vote: I do not like it

As a participant, I need more time to recover from the previous contest.

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6 weeks ago, # |
  Vote: I like it +304 Vote: I do not like it

They stole my contribution =(.

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6 weeks ago, # |
  Vote: I like it +5 Vote: I do not like it

Ok then

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6 weeks ago, # |
  Vote: I like it +5 Vote: I do not like it

very comedically humorous Ari

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6 weeks ago, # |
  Vote: I like it +39 Vote: I do not like it

Is feedback meant for frightening us?

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6 weeks ago, # |
  Vote: I like it +48 Vote: I do not like it

As a participant, I am already scared

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6 weeks ago, # |
Rev. 2   Vote: I like it +204 Vote: I do not like it

Finally this day has came, a round with adamant as an author.

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6 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

thanks for the meme!

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6 weeks ago, # |
  Vote: I like it +18 Vote: I do not like it

The announcement just ensured that one more time we are gonna miss MiFaFaOvO vs tourist match.

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    6 weeks ago, # ^ |
      Vote: I like it -12 Vote: I do not like it

    Tbh, it looks more like ecnerwala vs tourist to me. Just an opinion tho.

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      6 weeks ago, # ^ |
        Vote: I like it -19 Vote: I do not like it

      I don't get why you guys are more interested in tourist than yourself.

      Is that why you are green/cyan?

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        6 weeks ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        I find inspirations seeing the success of some great coders so that i am interested about them.You better focus on your own success (as you are a colorless or a fake account).

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6 weeks ago, # |
  Vote: I like it -24 Vote: I do not like it

Glad a real CF round is coming,last round killed my spirit...

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    6 weeks ago, # ^ |
      Vote: I like it -52 Vote: I do not like it

    Hope this doesn't happen

    Spoiler
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      6 weeks ago, # ^ |
      Rev. 2   Vote: I like it +4 Vote: I do not like it

      .

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        6 weeks ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        Do you want to say anthing about this

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          6 weeks ago, # ^ |
            Vote: I like it +13 Vote: I do not like it

          Yes I wasted a lot of time and truly it sucks . Moreover it made me realized that I should focus on solving problems instead of making memes. I had no intention of disrespecting you but only making letting you know about my mistake.

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            6 weeks ago, # ^ |
              Vote: I like it 0 Vote: I do not like it

            Thanks for letting me know. I had no intention of disrespecting you too.

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

As a participant, I am eager for tourist vs Um-Nik

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    6 weeks ago, # ^ |
      Vote: I like it +18 Vote: I do not like it

    That's rather as a spectator. You don't need to participate for that.

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6 weeks ago, # |
  Vote: I like it +27 Vote: I do not like it

tags: "doomsday" oof

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6 weeks ago, # |
  Vote: I like it +12 Vote: I do not like it

People trying to be sarcastic in comment section Problem Setters And Testers : Say No More

Ps : Is it best announcement ever? :P

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6 weeks ago, # |
  Vote: I like it +116 Vote: I do not like it

MiFaFaOvO : " I'm happy sitting atop the CF rankings. You guys give the contest."

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6 weeks ago, # |
Rev. 3   Vote: I like it +69 Vote: I do not like it

You will be given 2 hours and 30 minutes to solve 9 problems, and we highly encourage you to read all of them :)

Is this statement meaningful or is this general good advice for any round?

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6 weeks ago, # |
  Vote: I like it +139 Vote: I do not like it

But man, by the time I understand 9 problem statements, 2,5 hour is already gone, and I already forgot 8 of them...

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

As a russian guy, I don't understand tester's feedback.

Joke

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6 weeks ago, # |
  Vote: I like it -27 Vote: I do not like it

Looks like it's going to be a difficult contest.

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6 weeks ago, # |
  Vote: I like it +220 Vote: I do not like it

"As a problemsetter, I am sorry"
As a contestant,

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6 weeks ago, # |
  Vote: I like it +256 Vote: I do not like it

......

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6 weeks ago, # |
  Vote: I like it +37 Vote: I do not like it

As a participant, I will participate.

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6 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

Looking forward to the problems. The announcement is hilarious and I hope the problems will be as well.

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6 weeks ago, # |
  Vote: I like it +235 Vote: I do not like it

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

Don't worry, you guys are gonna enjoy the round :)

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6 weeks ago, # |
  Vote: I like it +19 Vote: I do not like it

Probably, one of the best contest announcements.

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6 weeks ago, # |
Rev. 4   Vote: I like it -11 Vote: I do not like it

As a contestant, I quit.

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

i'm confused, should we be playing or not?

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6 weeks ago, # |
  Vote: I like it +185 Vote: I do not like it

I see that I'm going to love this round...

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    6 weeks ago, # ^ |
      Vote: I like it +94 Vote: I do not like it

    No, you'll say that there is another platform for such contests

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      6 weeks ago, # ^ |
        Vote: I like it +106 Vote: I do not like it

      To be honest, adamant and antontrygubO_o together as problemsetters give hope that we'll finally see some balance.

      But also the opposite is possible: that every problemsetter has just a position (A-I) assigned and all the problems will be chosen completely independently from the others and we'll finish having a 100% "another platform" contest.

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

Hoping to become an Expert after this round :)

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6 weeks ago, # |
  Vote: I like it +441 Vote: I do not like it

Do you want to get fewer participants with this anti-advertising of the problem set? If the goal is to avoid the server load, just say that there will be a lot of math in div2 problems.

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    6 weeks ago, # ^ |
      Vote: I like it -15 Vote: I do not like it

    LOL ! People will still try out of courage and for rating ! If it goes well they will be commenting like Best ProblemSet ever ! and if not they have their cliche MathForces

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    6 weeks ago, # ^ |
      Vote: I like it +431 Vote: I do not like it

    There are a lot of math in div2 problems.

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    6 weeks ago, # ^ |
      Vote: I like it +37 Vote: I do not like it

    Errichto It's been a long time since we saw you setting problems ! Come Back ! Soon ! :)

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    6 weeks ago, # ^ |
      Vote: I like it +35 Vote: I do not like it

    Even better, just say the whole round is Geometry

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    6 weeks ago, # ^ |
    Rev. 2   Vote: I like it -16 Vote: I do not like it

    When you khow people scared with math then do you do something like tutorial on how to get well in math? Errichto

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      6 weeks ago, # ^ |
        Vote: I like it +8 Vote: I do not like it

      I doubt that abundance of tutorials is going to cure aversion to "math".

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    6 weeks ago, # ^ |
      Vote: I like it -14 Vote: I do not like it

    I think. they r going for reverse psychology here....!!

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6 weeks ago, # |
  Vote: I like it -15 Vote: I do not like it

First time, I see meme in contest announcement.There must be a reason behind it. We should be aware of that.Good luck to everyone. :p

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6 weeks ago, # |
  Vote: I like it -34 Vote: I do not like it

How pupils become tester? :D

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6 weeks ago, # |
  Vote: I like it +34 Vote: I do not like it

As a contestent, I want rating.

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

xd

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6 weeks ago, # |
Rev. 2   Vote: I like it +2 Vote: I do not like it

Same story, again and again, my smoll pp skills and big pp problems.

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6 weeks ago, # |
  Vote: I like it -18 Vote: I do not like it

Best CF Round invitation ever =P

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6 weeks ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

as a participant, i am also scared and i don't want to participate!)

GL&HF to everyone!!!

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6 weeks ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

....

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    6 weeks ago, # ^ |
    Rev. 2   Vote: I like it +13 Vote: I do not like it

    As a tester, My advice is to think 1 more day, because problems are more scarier than you are thinking...XD

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6 weeks ago, # |
  Vote: I like it +5 Vote: I do not like it

I don't know why but it is giving me vibes of an amazing round.

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6 weeks ago, # |
  Vote: I like it +167 Vote: I do not like it

.PicsArt_07-02-02.16.38.jpg****

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

9 Problems with an army of testers and 8 writers. Excited

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6 weeks ago, # |
  Vote: I like it -27 Vote: I do not like it

IT IS TAGGED DOOMSDAY!!!

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6 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

New here, it is going be my first Global Round and the comments already scare me. Is it a good idea for a new guy to take part in it? or will it be discouraging?

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    6 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    If you are new dont think of rating from the beginning try giving as many contest as you can. Thats what i learnt

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6 weeks ago, # |
  Vote: I like it +12 Vote: I do not like it

9 problem that's huge. I appreciate the hard work to make a contest.

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

    Yes appreciate problem setters for these kind of contests

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      6 weeks ago, # ^ |
        Vote: I like it +41 Vote: I do not like it

      "You will be given 2 hours and 30 minutes to read all of them." I think that's what he is trying to say.

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6 weeks ago, # |
  Vote: I like it -41 Vote: I do not like it
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    6 weeks ago, # ^ |
      Vote: I like it -18 Vote: I do not like it

    Appreciate your work but we can directly search any round and go to contest link in the announcement.

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      6 weeks ago, # ^ |
        Vote: I like it -8 Vote: I do not like it

      The reason why it is not useful is probably not that "we can find it ourselves" but that this list was also shared in the previous global round. In fact, link to a web app was shared which can do this right away.

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6 weeks ago, # |
  Vote: I like it -16 Vote: I do not like it

This global round seems to be very special among all previous global rounds because of its awesome announcement!!

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6 weeks ago, # |
  Vote: I like it -19 Vote: I do not like it

As a participant, I want positive delta.

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

I was going to make a century of losing rating in last contest...I think,this is another opportunity to complete the century...Shouldn't I be happy!!! SENTY_EMO

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6 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

how is global round different from other rounds???

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6 weeks ago, # |
  Vote: I like it +12 Vote: I do not like it

As a contestant, I will take part in the contest. :)

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6 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

highly encourage you to read all of them :)

Again this contest will be like solving only the A problem in my case

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6 weeks ago, # |
  Vote: I like it -16 Vote: I do not like it

Can someone tell me what happened to static a2oj? I used to solve problems from there difficulty wise and now, instead of that a different website with that names comes and all the problems of the ladder are locked there.

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

Finally, memes are on Contest announcement blog post :v

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6 weeks ago, # |
  Vote: I like it -11 Vote: I do not like it

Explain me the difference between Educational round and Global round in div 2 like contest there is time penalty what about Codeforces Global Round .Thank you.

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    6 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    In Global round also every problem score decrease with time . It's almost like Div-2.

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    6 weeks ago, # ^ |
      Vote: I like it +24 Vote: I do not like it
    1. Global round is rated for everyone, educational round is rated for people who have rating less than 2100

    2. Global round has some fixed points for each problem which reduces slowly as time goes on, all problem has equal points on educational rounds.

    3. Hacking runs parallel with contest in global round, there is hacking phase in educational rounds after contest finished.

    4. Wrong submission on finally accepted solutions will cost you 20 points in global round, in educational rounds it will cost you additional 10 minutes time penalty.

    5. On global round last pretest passed solution will be judged and resubmission will cost you 50 point and in educational rounds all pretest passed(accepted) solution will be judged and 1st solution that passed system test will be considered.

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      6 weeks ago, # ^ |
      Rev. 2   Vote: I like it +2 Vote: I do not like it

      How do you compare 20 points vs 10 minutes of penalty? What is the exact relation (if there exists one)?

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        6 weeks ago, # ^ |
          Vote: I like it +21 Vote: I do not like it

        I compare in sense of what will happen one submit a wrong solution.

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6 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

thanks to all of them for frequent rounds

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

Next round after the global round is one week later.Are we not going to have any round before that?

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

    There are almost 2 educational and div3 rounds in every month.So probably we will be having both also if a contest is added for date x it does not mean mike can not add a contest which has date strictly lesser than x.

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

A meme in the announcement .. you got my upvote

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    5 weeks ago, # ^ |
      Vote: I like it -8 Vote: I do not like it

    Hey Boss how to get like your meme idea.. I want to make my contribution 0.

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      the idea just flashes in my mind and I search for photos that can present the meme and edit it on paint
      I can give you an advice some of my memes goes this way you just compare 2 completely opposite situations like this one
      it's how I used to be when I started and how I'm like now this meme is actually sad for me XD
      or like this one
      it starts with someone asking them to be quite while it ends up with a party so there should be an element of surprise if it's something expected or usual then this is a bad boring meme and it should be about codeforces and competitive programming not jokes about html that's out of the context

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6 weeks ago, # |
  Vote: I like it +179 Vote: I do not like it

You will be given 2 hours and 30 minutes to solve 9 problems, and we highly encourage you to read all of them :)

Problem I.

You are given two integers a and b. Print a+b.

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

I am excited for the round..hope for the best

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

dude that feedback gave me chill more than any meme xD xD

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5 weeks ago, # |
  Vote: I like it -24 Vote: I do not like it

WTH to me. i was going to attend the contest today at 20:35..

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5 weeks ago, # |
  Vote: I like it +87 Vote: I do not like it

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5 weeks ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

I like this meme!

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5 weeks ago, # |
  Vote: I like it -9 Vote: I do not like it

+1 for the meme

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5 weeks ago, # |
  Vote: I like it +6 Vote: I do not like it

I love the announcement """""D

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

Thanks for such a great round.

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5 weeks ago, # |
  Vote: I like it -48 Vote: I do not like it

In problem B,can anyone explain this formula => a+(a+1)+(a+2)+...+b=(a+b)∗(b−a+1)/2 and what is it called

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5 weeks ago, # |
  Vote: I like it -18 Vote: I do not like it

I hope there are a few or no problems based only on observation

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    5 weeks ago, # ^ |
      Vote: I like it -26 Vote: I do not like it

    I hope a problemset like that of the previous round doesn't happen again. Problems A-D: Observation. A-C are 1 liners. D is two nested for loops which can be written with 3 lines. Problem F: Think for half a second, implement for half an hour.

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

In China, there is a well-known serie of huge datastructure problems called Ynoi.... Is it gonna have huge datastructures like ctholly tree?

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5 weeks ago, # |
  Vote: I like it +54 Vote: I do not like it

As a stupid American, I don't get the testers' jokes.

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5 weeks ago, # |
  Vote: I like it -21 Vote: I do not like it

As a participant, I have a hunch that I should hide my brain during the contest

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

Excuse me. Can someone tell me how the round is rated? I mean: is it rated like div.1, div.2, or div.3? I'm not very familiar with the contests of CodeForces (as you can see I'm a Newbie). Thanks for helping!

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5 weeks ago, # |
  Vote: I like it -16 Vote: I do not like it

so here comes the DOOMSday

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5 weeks ago, # |
  Vote: I like it -20 Vote: I do not like it

For the first time, I am feeling nervous that something bad is going to happen with me in this round :(

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5 weeks ago, # |
Rev. 5   Vote: I like it +5 Vote: I do not like it

Codeforces contests are like a sport for me . I enjoy the problem mostly without noticing my rating .

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

is this one as easy as div 2?

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5 weeks ago, # |
  Vote: I like it -74 Vote: I do not like it

tourist after reading round feedback

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

As a participant, I am scared.

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5 weeks ago, # |
  Vote: I like it -34 Vote: I do not like it

Guys hide your gi̶r̶l̶s̶ ratings cuz Mr beaches is here skrr skrrr.

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

how the contribution is calculated.

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

    It works like the hippos, you have to effectively shed your territory.

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5 weeks ago, # |
Rev. 2   Vote: I like it +64 Vote: I do not like it

Ari Hey, I understand that you want to make a point, but don't you think tagging them is unnecessary? I believe noone likes to be tagged just to see themself being thanked every week.

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

GOOD LUCK TO EVERYONE!!!

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5 weeks ago, # |
  Vote: I like it +19 Vote: I do not like it

Out of curiosity, What's the record for the most downvotes? (Can this comment break that record? xD)

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5 weeks ago, # |
  Vote: I like it +149 Vote: I do not like it

gamegame and dorijanlendvaj, for their help in improving the humor of the round.

During round :

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

Honestly, Is this contest suitable for a newbie????

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    5 weeks ago, # ^ |
    Rev. 2   Vote: I like it -14 Vote: I do not like it

    Don't.

    tbh tho A and B solvable.

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      Need to learn a lot. Couldn't solve even 1 ques. :(

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        5 weeks ago, # ^ |
          Vote: I like it +1 Vote: I do not like it

        If you want easier problems to try on, i personally think the first few problems on AtCoder Beginner Contests are quite suitable. Have fun!

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    5 weeks ago, # ^ |
      Vote: I like it +4 Vote: I do not like it

    Yes, AB should be easy enough. Go do it!

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5 weeks ago, # |
  Vote: I like it +194 Vote: I do not like it

10 minutes delay, sorry. I'm trying to fix Ruby installation.

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    5 weeks ago, # ^ |
      Vote: I like it +31 Vote: I do not like it

    No problem sir. Codeforces is such a good platform that these types of delays doesn't hurt if contest go on smoothly

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    5 weeks ago, # ^ |
      Vote: I like it +9 Vote: I do not like it

    Contest smoothness >>>>> 10-15 minutes delay

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5 weeks ago, # |
  Vote: I like it +94 Vote: I do not like it

My adrenalin just got wasted

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5 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

Delayed by 10 minutes :/

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5 weeks ago, # |
  Vote: I like it -264 Vote: I do not like it

What the fuck? Why is CF so bad in punctuality? -_-

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    5 weeks ago, # ^ |
      Vote: I like it +31 Vote: I do not like it

    you should write the words carefully.They are doing hardwork for us

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      5 weeks ago, # ^ |
        Vote: I like it -52 Vote: I do not like it

      Agreed but they can't just play with our time? Can they? :)

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        5 weeks ago, # ^ |
          Vote: I like it -17 Vote: I do not like it

        They don't force you to play this.. are they ?

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        5 weeks ago, # ^ |
          Vote: I like it -6 Vote: I do not like it

        Try to compete in virtual contest then.

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        5 weeks ago, # ^ |
          Vote: I like it +3 Vote: I do not like it

        Did codeforces questioned you ever ? or did they ever ask you to pay for such an amazing platform? Be patient.

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

          Tell me the day you need to pay to codechef or topcoder or any other site that exists!

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            5 weeks ago, # ^ |
              Vote: I like it 0 Vote: I do not like it

            True, but be patient at the same time.

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              5 weeks ago, # ^ |
                Vote: I like it +6 Vote: I do not like it

              Yeah bro absolutely! All the best to you for the round! Have a large delta!

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            5 weeks ago, # ^ |
              Vote: I like it 0 Vote: I do not like it

            Someone is talking about codechef , LOL. Can you please deactivate your codeforces account? And enjoy codechef. All the best :)

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            5 weeks ago, # ^ |
              Vote: I like it 0 Vote: I do not like it

            Do we need to state the difference in the quality of Codeforces and Codechef?

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    5 weeks ago, # ^ |
      Vote: I like it +13 Vote: I do not like it

    A delay of 10 minutes is much better than an unrated contest or queueforces!

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    5 weeks ago, # ^ |
      Vote: I like it +6 Vote: I do not like it

    Calm Down,man. We all are human, we all make mistakes.

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Don't thank MikeMirzayanov if you can't, But please don't hurt the sentiments of the fellow codeforces users.

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5 weeks ago, # |
  Vote: I like it +28 Vote: I do not like it

Oh shit! Now I'll have to listen to Twice once again.

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Oh shit! You had to listen Twice twice, it's two squared)

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5 weeks ago, # |
  Vote: I like it -22 Vote: I do not like it

This ten minute extension is ruining the moment :(

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5 weeks ago, # |
  Vote: I like it -20 Vote: I do not like it

my precious time....22:35->22:45

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

Delayed??

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

Is today's contest suitable for newbie and lower pupil?

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    5 weeks ago, # ^ |
      Vote: I like it -8 Vote: I do not like it

    Yes...I think by solve a,b we can increase our rating easily !!

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    5 weeks ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    A and B should be solvable by everyone, I think. But even if they weren't, participating in a contest is always suitable.

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Even if you couldn't solve any problem during the contest, you will learn something from the editorial afterward.

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5 weeks ago, # |
  Vote: I like it -49 Vote: I do not like it

What the fuck! Another 10 minute wasted. 10 min wasted before starting by waiting.

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    5 weeks ago, # ^ |
      Vote: I like it +15 Vote: I do not like it

    Codeforces is doing hardwork for free. You should not say these 10min wasted. Its way much better than an unrated contest due to long queues.

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5 weeks ago, # |
  Vote: I like it -16 Vote: I do not like it

Ok, all set, 5.4.3.2.1 let's start..........not now, come again after 10 min xd

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5 weeks ago, # |
  Vote: I like it -20 Vote: I do not like it

damn the tension in the air was rising and the delay ruined it all lol.

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5 weeks ago, # |
Rev. 2   Vote: I like it -16 Vote: I do not like it

[deleted]

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

have you noticed the registrants are still increasing

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5 weeks ago, # |
  Vote: I like it +52 Vote: I do not like it

An interesting observation: all the people complaining about adrenaline being washed out etc. are below blue and below.

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    5 weeks ago, # ^ |
      Vote: I like it +31 Vote: I do not like it

    Interesting observation: all the people always having problem about something and not taking a joke as a joke are purple and above

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5 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

Codeforces Global Round Exists:

meme.jpg

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5 weeks ago, # |
  Vote: I like it +20 Vote: I do not like it

As a contestant, I just read the questions

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5 weeks ago, # |
  Vote: I like it +12 Vote: I do not like it

This was the Hardest A i have seen till now.

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Not at all :| Hard but not hardest !!

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      How can you tell me on my behalf.i said i have seen till now,read the comment again.

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        5 weeks ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        Cause you attend 62 more contest..it is not so hard.

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          5 weeks ago, # ^ |
            Vote: I like it 0 Vote: I do not like it

          I think i got horrified from the contest announcement.XD

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    5 weeks ago, # ^ |
      Vote: I like it +4 Vote: I do not like it

    For me A was harder than B and C. Took me a while to reach the solution

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      Same here solved A in total 1:30 hrs and C in 10 minutes. xD

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        5 weeks ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        But C's logic was beautiful though, i was scared that am i missing some case here.

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

Took me a while to solve A. Do I have enough courage to face B. Idk

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5 weeks ago, # |
  Vote: I like it +12 Vote: I do not like it

As a tester, I am very happy that I can enjoy others suffering in the contest. This line become true lol. But really awesome problemset

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5 weeks ago, # |
  Vote: I like it +58 Vote: I do not like it

i should have taken those feedbacks seriously :(

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

Very good contest nice problemset

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5 weeks ago, # |
  Vote: I like it -7 Vote: I do not like it

hope mifafaovo gets dethroned by umnik this time!

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

[*] rating

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5 weeks ago, # |
  Vote: I like it +138 Vote: I do not like it

As a participant, this round gave me PTSD. XD

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    I gave this contest in the hope for specialist but it seems that still specialist is far away from me...

    BTW logic for 3rd one is

    "NO" if(a[0] > a[n-1] ) , else "YES"

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    5 weeks ago, # ^ |
      Vote: I like it +25 Vote: I do not like it

    I think I need more IQ to solve problem like these, not algorithm knowledge. :)

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      I wasted a lot of time on see and then I took pen and copy and within 3 min I was able to write the code.

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5 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

Arggg. Tough round. Great problems, though!

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5 weeks ago, # |
  Vote: I like it +161 Vote: I do not like it

Ari: how many constructive problems do we need?

Other setters: Yes

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5 weeks ago, # |
  Vote: I like it +1 Vote: I do not like it

Great round with difficult problems. Hoping for a fast editorial.

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5 weeks ago, # |
  Vote: I like it +241 Vote: I do not like it

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5 weeks ago, # |
  Vote: I like it +11 Vote: I do not like it

I wonder who did created problem D.

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5 weeks ago, # |
Rev. 2   Vote: I like it +185 Vote: I do not like it


Never again.

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Thus, hocky went and made a catfish farm instead. He is now known as the catfish farmer.

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

Is there anyone else who could solve D in like 10-15 minutes and has no idea about solving C? Bad day!

Anyways how to solve C?

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

    The last element must be greater than the first

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    how to solved D ?

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    5 weeks ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    arr[0] < arr[n-1] => YES else NO

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    if(a[n-1]>a[0]) cout<<"YES\n"; else cout<<"NO\n";

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    5 weeks ago, # ^ |
    Rev. 3   Vote: I like it +4 Vote: I do not like it

    if $$$a[0] < a[n - 1]$$$ then "YES" else "NO"

    Consider this example

    5 6 7 4 8 9 10 13 11 12

    This can be visiualize as

    $$$[increasing] [increasing] [increasing]$$$

    5 6 7 4 8 9 10 13 11 12

    But How we are breaking this sequence ?

    We are considering $$$first$$$ and $$$last$$$ will remain in the end of the process. So our focus is to remove all the element in between.

    See,

    4 $$$<$$$ 5 $$$(first element)$$$, this will insert break in our sequence, from this index we will start making new increasing sequence.

    Similarly observe, 13 < 12 $$$(last element)$$$, this will insert a breaking point.

    Now, if you think a little about it, you will see we can merging first increasing sequence and last increasing sequence like this

    5 6 7 4 8 9 10 13 11 12 ==> 5 6 7 4 11 12 ==> 5 6 7 11 12

    So the sufficient condition would be $$$a[0] < a[n - 1]$$$ for answer to be exists.

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    5 weeks ago, # ^ |
    Rev. 3   Vote: I like it +5 Vote: I do not like it

    34 people (and 2 in under the next such question) have replied to this comment but no one has even slightly explained why this is true. What's the use of such responses?