YouKn0wWho's blog

Codeforces Round #735 (Div. 2)
By YouKn0wWho, 2 months ago, In English

কি অবস্থা মামা? (That's Bengali for "What's up dude?")

I am super excited to invite you to participate in Codeforces Round #735 (Div. 2) which will be held on Jul/29/2021 17:35 (Moscow time). This round is rated for future LGM participants whose current rating is $$$\le 2099$$$.

You will be given $$$5$$$ problems and $$$2$$$ hours to solve them. All the problems are authored and prepared by me.

I would like to thank -

The statements are super short and I have tried to make the pretests strong. I encourage you to read all the problems and solve them all.

I would like to dedicate this contest to the fallen king, my father, who died two months ago. May he and all the departed good souls rest in peace.

Scoring distribution: $$$750 - 1250 - 1750 - 2000 - 3000$$$.

Good Luck!

UPD1: Thanks for participating, I hope that you guys loved the problems, and sorry for B being a bit difficult than usual.

UPD2: Editorial

UPD3: Congratulations to the winners.

Div.1 + Div.2:

  1. turmax
  2. Karry5307_AK_NOI2021
  3. SSRS_
  4. Pyqe
  5. X_qaeq

Div.2:

  1. Karry5307_AK_NOI2021
  2. X_qaeq
  3. MiFaFaMYY
  4. sbren_sbeve
  5. LilliaAsupurei

Also, congratulations to the first solvers:

A: LiM_256, at $$$0$$$ mins!
B: RinShima, at $$$4$$$ mins!
C: xiaofan7, at $$$7$$$ mins!
D: 6945930042DucLA, at $$$7$$$ mins!
E: rainboy, at $$$23$$$ mins!

 
 
 
 
  • Vote: I like it
  • +2167
  • Vote: I do not like it

Comments Comments (466)
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2 months ago, # |
  Vote: I like it +29 Vote: I do not like it

whoa!

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2 months ago, # |
← Rev. 2   Vote: I like it +183 Vote: I do not like it

A Bangladeshi round after $$$7$$$ years. As a Bangladeshi , it feels very special. Eagerly waiting for it. <3

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    2 months ago, # ^ |
      Vote: I like it -8 Vote: I do not like it

    And the setter expected us to read all the problem, but not solve them all, that's the depressing part vai. :(

    But I'm happy.

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

      He wouldn't be too happy if we all solve all the problems right :)

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2 months ago, # |
  Vote: I like it -91 Vote: I do not like it

Speed forces it is.

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

We are also super excited to participate!!

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2 months ago, # |
  Vote: I like it +400 Vote: I do not like it

The problems are super interesting. As a tester, I encourage everyone to participate (and also upvote this comment :3).

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

    your wife is really beautiful in your dp

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

      As per i know he isn't married yet and this kid maybe his cousin or sister!

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

      Thats probably his younger sister

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

      you are a such a nonsense that you cannot even understand who that can be. Even if someone's wife is beautiful do you need to talk like this specially in such a platform?

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

      Your comment shows the proof of your name sahi_pakde_hai

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

    A lot of upvotes and testers are highly recommending it... I think everyone should give it. I will also give... :)

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2 months ago, # |
  Vote: I like it +162 Vote: I do not like it

The problems statements are very clear and precise. Hope everyone will enjoy the round. And also, don't forget to READ ALL PROBLEMS.

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

Eagerly waiting for this round

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2 months ago, # |
  Vote: I like it +146 Vote: I do not like it

Noticed this in the blog? :P

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2 months ago, # |
  Vote: I like it +23 Vote: I do not like it

Eagerly Waiting for this round ! খেলা হবে মামা !

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2 months ago, # |
  Vote: I like it -27 Vote: I do not like it

Pls no fst pls no fst plsssss

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

    I almost fst is related to getting wrong answer but please tell the full form of fst.

    PS: I DON'T SPEND MUCH TIME IN CODEFORCES COMMENT SECTIONS

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2 months ago, # |
← Rev. 2   Vote: I like it +35 Vote: I do not like it

Thanks for this delightful invitation, and for sharing with us the kind dedication to your father's soul.

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

RIP. He's looking at you from heaven :)

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

oh hoo!! The first bengali round I have seen so far. Feeling very proud.

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

    A Bengali round with Bengali problems ... (expected) :)

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

Shei

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2 months ago, # |
← Rev. 11   Vote: I like it +14 Vote: I do not like it

May Allah rest your father's soul, Ameen.

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2 months ago, # |
← Rev. 2   Vote: I like it +128 Vote: I do not like it

As a tester, I really liked the round. The problems are very nice (Do give a read to all of them). The statements are short and concise.

Also... as a tester, it is my duty to inform you there's an upvote button to this comment... UwU

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

as a tester, I recommend this contest to everyone.

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

অস্থির (amazing)

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2 months ago, # |
  Vote: I like it +31 Vote: I do not like it

As a Bengalee,I am very glad to see the starting line of the blog is written in Bengali.Hoping for some exciting problems.

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

I am going to participate in this contest(& lose some rating!).

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

Eagerly waiting for it. Super excited.

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

May Allah grant your father Jannatul Ferdous.Ameen.

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

Super Excited!

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

Score distribution is kinda odd for people like me. Hope it won't be too hard. Best of luck for your first cf contest.

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

ভাল্লাগছে <3

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

I am also super excited to participate.

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

Proud to witness বাংলা ♡ in codeforces .Pleasure to the eyes.

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2 months ago, # |
← Rev. 4   Vote: I like it -49 Vote: I do not like it

as a follower of him,one suggetion: take number theory and graph theory carefully :3

Thanks for representing Bangladesh in codeforce after many years.

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

Pro A : 250 and Pro A : 750 :V

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

As a Bangladeshi , I feel proud :)

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

Nice to see a Bangladeshi Round

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

Super exited to participate in this round !! Can't Wait !

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

Eagerly waiting for this amazing round. Khela hobe although I'm a noob

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

Time to upsolve this and this round

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

আলহামদুলিল্লাহ মামা ভালো আছে :)

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2 months ago, # |
  Vote: I like it +17 Vote: I do not like it

I see what you did to Anton :)

Spoiler
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    2 months ago, # ^ |
      Vote: I like it +31 Vote: I do not like it

    I was wondering why people are talking so much about that line. Now I realize it's in white font and I'm in dark mode, so it appeared normal text to me.

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2 months ago, # |
  Vote: I like it +34 Vote: I do not like it

This round is rated for future LGM participants whose current rating is ≤ 2099

Wow that was very motivating!

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

Proud of you. Best wishes for you. I am Eagerly waiting for this round. Hopefully i will enjoy the problem set. (আসো খেলবো,খেলা হব্বে ২৯ তারিখ)

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

I always cherished for participating in Bangladeshi Round.Now here it has come <3 .

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

The statements are super short

Already feeling like it's gonna be a great round.

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

সব ঠিক মামা!

Eager to participate in this, I'm definitely a newbie, but I feel proud to see a Bangla round!

Cheers from India!

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

One of the sweetest invitation ✨✨✨

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

As a Codeforces Optimal Theme user I see this!

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

Super excited for a Bangladeshi round, hope for a smooth experience.

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

Hope that Bangladeshi round will be held more often beginning with this round.

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

The first Bangladeshi round I'm seeing. Eagerly waiting for the contest. Feeling proud.

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2 months ago, # |
← Rev. 2   Vote: I like it +1 Vote: I do not like it

I am seeing "কি অবস্থা মামা" in a Codeforces blog!! What a pleasure for eyes!! Not going to miss this contest at any cost.

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

Eagerly waiting for this one.

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

pari na pari ,khela hobe !

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

5 problems & 2 hours is the best format for a CF round. I don't know why this is so rare nowadays. Hope this will be a great round. Best of luck.

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

As a Bangladeshi this is a very mesmerizing news. This will surely encourage Bangladeshi contestant to be more precise on this competitive filed. Proud to be a Bangladeshi. Congratulations to you all and we are very honored. Wising best of luck to everyone. Hopefully this will be an interesting contest. Waiting to be a part of this historical journey..

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

YouKn0wWho orz!

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

Love from Kolkata(India) <3

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

Kya hal h bhai ke (that's in hindi for what's up dude)

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

I would like to dedicate this contest to the fallen king, my father, who died two months ago.

Sorry to hear about this. May his Soul Rest In Peace.

Thanx For the Round BTW

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

Pray May Almighty grant paradise to your father. It's very pleasure to see Bangladeshi <3.

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

Very excited to participate this round!

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

Omg! Bangla Brigade on fire, so many comments within 2hrs!!
As a YouKn0wWho Fan I highly recommend participating in this round, he has authored many lovely problems on CodeChef and toph.co before. Super excited for this round!

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

Rating loss or gain...Hope everyone can give their best

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

Let's hope problems are as interesting as this announcement was.

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

I was so surprised to see that Bengali phrase! Excited for the round...

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2 months ago, # |
← Rev. 3   Vote: I like it -18 Vote: I do not like it

I love me

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2 months ago, # |
  Vote: I like it +141 Vote: I do not like it

When author says "I encourage you to read all the problems"

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

    I managed to solve the last problem in Codeforces Round #714 (Div. 2), though I was a Pupils at the time!

    Spoiler

    So everyone should read all the problems and try to the last moment!

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

      Did you have a hacky solution or just random thing which passed pretests or was it actually something close to the editorial's solution?

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        2 months ago, # ^ |
          Vote: I like it +25 Vote: I do not like it

        It's a lame solution. It only checks $$$10^8$$$ pairs, and that's enough for random tests but it can be easily hacked.

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

    That applies to specialist like me also.

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      2 months ago, # ^ |
        Vote: I like it +17 Vote: I do not like it

      That applies to a pleb CM like me also lol. Let's be real, if you can solve div 2E consistently, then you are at least master level.

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

        Agreed (esp. with the "at least" prepended to master). I still can't solve div 2E consistently

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

    In this round, its problem B '_'

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

    was E really easy?

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2 months ago, # |
  Vote: I like it +54 Vote: I do not like it
lighthearted meme
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2 months ago, # |
  Vote: I like it 0 Vote: I do not like it

সেরা সেরা !!!. Really excited . Hoping for some exciting problems.

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

It's Bengali! I am so excited!!

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

Khela Hobbe MAMA

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2 months ago, # |
← Rev. 2   Vote: I like it +9 Vote: I do not like it

YouKn0wWho

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

Eagerly waiting for it as a Bangladeshi,We Bangladeshi's are super excited for this round!

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

Thankyou for the contest YouKn0wWho.Very much excited for it.

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

Okay does other contest blogs have hidden texts too? I discovered this for the first time;_;

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

This is really impressive! Eagerly waiting to participate and get mara :3

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

Hopefully , going to be a exciting round . And my deep condolences to you and your family .May your father's departed soul rest in Peace.

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

Never seen A problem with 750 points, its gonna be crazy ride.

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

অস্থির অবস্থা ম্যান (cool)

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2 months ago, # |
← Rev. 3   Vote: I like it +5 Vote: I do not like it

May ALLAH Grant Your Father Jannatul Firdaus, Brother. and I am having a great feeling that the problems will be very interesting.

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2 months ago, # |
  Vote: I like it +23 Vote: I do not like it

Yes your father is a real king, rest in peace.

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

Wish to participate in your next round.

Best of Luck for the ICPC YouKn0wWho .

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

hi um new here:)

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

অবস্থা ভাল না কিন্তু ভাল করানোর চেষ্টায় আছি

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

Eagerly waiting ... hope to regain my lost position in this round (T~T)

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

mama?

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

    Real meaning of mama is maternal uncle. But people of Bangladesh love to address friends, any unknown person as mama. This is a common thing in Bangladesh.

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

This is really a proud moment vai.Waiting for it!

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

More power to you!!

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

thanks vai for keeping the statement short and clear, hope to get some interesting Bengali words in problems, and of course we'll have fun.

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

Really excited!!! Eagerly waiting for this round.<3

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

Eagerly waiting for this round .

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2 months ago, # |
  Vote: I like it +22 Vote: I do not like it

Being excited, motivated, happy, and sad at the same blog

I'm sure your father is proud of you

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

Cheers to super short statements!

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

God bless your father

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

Hi So excited I'm from Bangladesh too! Hope the number of Bangladeshi coders would only increase.

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

"The statements are super short and I have tried to make the pretests strong."

Orz

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

The score distribution seems to be quite difficult than usual.

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

Epic work man.I will do it.

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

I like short question descriptions very much

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

This round is rated for future LGM participants whose current rating is $$$\le$$$ 2099.

What a wonderful line to read before the contest.

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

i have a doubt what does scoring distribution means ?

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

একদম কড়ড়া মামা!!

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

Can’t wait to participate

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

Hope this round repairs what happened in last global round :))

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

Short statement gives goosebumps :s

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

Inshallah, That will be my first rated Bangladeshi contest at cf. And Ki obostha mama ? :"D

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

Strange thing noticed: The ________ (underscore), in the list of testers, has blue color in the blog-post, but not in actuality (check his account)!!

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

Excelsior to take part and face new challenge adn learn from them, hope you have not added any question from xor

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

Alhamdulillah super excited for this round

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2 months ago, # |
  Vote: I like it +17 Vote: I do not like it

My 100th Round in Codeforces is going to be a Bangladeshi round,really!!! As a Bangladeshi i am really excited!

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

As a fan of Hero Alom, I can't wait for this round. I love Bangladesh.

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

I'm also super excited for this contest. As a Bangladeshi I'm really proud of it.

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

Really proud of you, man! YouKn0wWho ❤️

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

Trying selecting the first line under "I would like to thank -". Hahahaha

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

He is legend in codeforce i try to follow him..i solved acroding to his 1st submission!congrats mann!

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

Expect! First time to participate Bangladesh round :)

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

We are also super excited to participate

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

You are proud son of your parents. RIP to his soul

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

Bangladeshi round => Comment section fully immigrated.

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

If you turn on dark mode you'll see that the author has written "I would like to thank -

antontrygubO_o for his awe-inspiring coordination of the round and rejecting my problems, and thus hurting my feelings"

but the last part is written with white ink.

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

RIP for your father. His thoughts and blessings will be always with you.

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

The statements are super short and I have tried to make the pretests strong. It's good to see.

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

শান্ত হও বন্ধু

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

hope all the newbies become specialist after this round :D

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

I love the way you bring this contest to us. Stay strong and good luck everyone!

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

সেই অবস্থা মামা |

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

Great initiative..Carry on brother

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

As a tester, I recommend you to read all of the problems

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

আসো, খেলা হবে...!

This round will be exciteful for all Bangladeshi.

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

Thank you for creating this contest.

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

God bless your father

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

I don't think I'll ever manage to reach LGM. Will this contest still be rated for me?

Jokes aside, really excited for what I think is the first contest with the standard 5 problems in 2 hours format in a while!

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

It seems that problems will be interesting. Mercy and forgiveness for your father.

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2 months ago, # |
  Vote: I like it +29 Vote: I do not like it

Bengalis, assemble.... খেলা হবে । সবাই খেলবো ।

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

Let's go amigos.

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

অবস্থা ভালা না কিন্তু ভালা করানোর চেষ্টায় আছি(2):3

i wish i were a good coder like you to represet Bangladesh:(

All Hail to the Good Kings in our life♥♥♥

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

" Ki obosta mama" this line is an emotion! I am super excited for this round! best of luck Shohag bhai!

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

"The statements are super short and I have tried to make the pretests strong." After this line, there is no doubt that the round will be marvelous.

Also, this round is being felt vary native to me. As a Bangladeshi, I seriously feeling proud.

As my father also died 4 years ago, I can understand your feelings. May Allah give Jannah to your father.

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

As a Bangladeshi, I am proud today. Eagerly waiting for this round.

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2 months ago, # |
  Vote: I like it -36 Vote: I do not like it

জয় বাংলা! জয় বঙ্গবন্ধু!

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

    I wonder If bangabandhu was a programmer instead of a politician then how peaceful the situation would be. Imagine $$$\color{red}{\text{SheikhHasina}}$$$ would be a proud tester of this beautiful round.

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      2 months ago, # ^ |
        Vote: I like it -10 Vote: I do not like it

      Oh yes we would have been living with the ISIS in peace and harmony!

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

24 hours pupil challenge, lol

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

why this peculiar score distribution

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

I might have skipped this round. But being a bengali I am super excited to participate in this round :)

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

love Bangladesh from Iran

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

Voldemort's contest it's gonna be tough

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

Short problem statements! I am expecting maths problems.

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

Thanks for keeping the statements short! :D

Eagerly waiting like everyone! :) Hopefully It's gonna be a nice contest!

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

Lets make it to 2000+ upvotes

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

May he and all the departed good souls rest in peace.

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

iakioi

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

Anybody noticed this on the first line in Thanks section

antontrygubO_o for his awe-inspiring coordination of the round and rejecting my problems, and thus hurting my feelings.__****

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

Only 5...?

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2 months ago, # |
  Vote: I like it -33 Vote: I do not like it

YEah , my very first participation in the contest as a bangali , the author bangali , পুরাই খেলে দিবে মামা :)

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

Feeling proud as a Bangladeshi contestant!

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2 months ago, # |
← Rev. 3   Vote: I like it 0 Vote: I do not like it

Most people like: go to comments to watch testers comments and understand if the round will be difficult or not. Wish you will grow your rating (my eng is bad, I know)

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

Good luck, Guys!

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

GLHF +_+

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

Well, this contest is probably rated for me because I'm a future Legendary Grandma.

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

I like rounds with 5 problems 2 hours to solve, short statements and intresting problems .. probably this one will be my favorite <3

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

খেলা হবে

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

I hope that I will like this contest, and not only me. I wish your father peace in the other world.

Good luck for all.

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

finally, div1.5

(according to scoring)

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

Will it be a mathforces ?

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

Good luck to everyone!

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

Did anyone see the hidden text in the blog. It reads: antontrygubO_o for his awe-inspiring coordination of the round and rejecting my problems, and thus hurting my feelings.

Just select the above line :P

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

hope that i will become expert today :)

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

Good luck, Guys!

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

মাম্মা অবস্থা ভালোই।

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

Good Luck!

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

Hoping A, B and C questions would be easy for a noob.

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

F

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

Oh I will not become a LGM in the future, so the contest is unrated for me!!!!!!!

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

Try to copy al text and you will see an invisible text after "antontrygubO_o for his awe-inspiring coordination of the round" .

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

Even though I quit CP 2 years ago. Still going to participate. Proud!

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2 months ago, # |
  Vote: I like it -15 Vote: I do not like it

greater than 700 cf rounds yet cant handle long queues

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

Welcome to queueforces

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

A<<<B drastic rise from A to B

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2 months ago, # |
← Rev. 3   Vote: I like it +32 Vote: I do not like it

Don't leave a single question easy make all of them hard. So I can finally quit! first question take 2 min rest --------- its like an appreciation token for participation. Codeforces is a platform where top 2000 people solve question rest all see the standing page after doing A question. Again div zero contest. There is no coolness in setting a hard contest , it should be a balanced one . increment in my preparation <<<<<<<<<<<<< increment in hardness. A year ago when I knew nothing i was able to solve at least two A B and C if its of graph or standard one. Now after months of practice I'm able to solve only A . A contest is of 2: 00 hr for me its of 5 minutes . Thanks codeforces for demotivating me again! For people less than 1500 its is buzzer round who solve A faster. thanks queueforces for ruining this buzzer round also.

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

    Do not get frustrated buddy. There will be some easy rounds you can increase your rating in those rounds.

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

    Well said! Recently it has been A-baits...

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

Aforces

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

Anime ka Hoda (✿☉｡☉)

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

HardForces IT IS!

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

suorer baccha contest

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

Why the problem B and C are too hard, frick this? Btw I'm saying this just bc I was not able to do problem B and C :(.

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

    Ikr.. even I wasn't able to do them. Probably some trick / method that I've never seen before. Unlucky :(

    Nevertheless, hoping to learn some useful stuff from the editorial

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

    prob C is easy if u just generate xors for yourself, it's some weird series of number, but in some time you should be able to find pattern in it (i started this too late)

    i found out that for numbers 0-15, 16-31, 32-47 etc difference between MAX and MIN is always 16

    just look at it:

    n = 3 m = 47

    3 2 1 0 7 6 5 4 11 10 9 8 15 14 13 12 19 18 17 16 23 22 21 20 27 26 25 24 31 30 29 28 35 34 33 32 39 38 37 36 43 42 41 40 47 46 45 44

    n = 20 m = 47

    20 21 22 23 16 17 18 19 28 29 30 31 24 25 26 27 4 5 6 7 0 1 2 3 12 13 14 15 8 9 10 11 52 53 54 55 48 49 50 51 60 61 62 63 56 57 58 59

    it must have some sort of pattern

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

      I tried this for 1.5 hour straight, couldn't find pattern to conclude ans.

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

13k participant only 2k solves for B, Great demotivation.

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

    Yep, what a round to pick to come back to CF after a 5 year pause lol

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

    I guess more have participated since there were almost 25k registrations. Quarter of them read the problems only I guess :(

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

I was only able to solve A. What things should I need to focus on? Noob from almost a year :-}

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2 months ago, # |
  Vote: I like it +34 Vote: I do not like it

and they said global round B is hard how about this B :P

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

idk what happened, D was much easier for me than B and C, couldn't solve them yet... :/

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

bitwiseForces

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

sadforces

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

Problem D is easier than B and C(Unless I FST)

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

RIP me killedforce :(

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

D > B > C

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

How to solve E?

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

    Only divisors of N-1 are important. Find array d[i] = number of arrays where i divides all elements (the answer is easy to find from that array). d[1] = 2^(N-1), all other d[i]'s are either 0 or 1 (proven by the following checking algorithm): start from leaves, it is uniquely determined whether that node is selected before it's 'parent' (k cannot divide both x and x+1). If it divides neither it's 0, if the check finishes it's 1.

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      2 months ago, # ^ |
        Vote: I like it +17 Vote: I do not like it

      Whaaaat? Why $$$d[1]=2^{N-1}$$$?

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        2 months ago, # ^ |
          Vote: I like it +12 Vote: I do not like it

        Ok, I understood. I read the statement incorrectly, I thought that the numbers are written in the operations' order, not in the vertices' order.

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

          Did the same thing :/

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

            Me too :(. I spent an hour trying to mess around with permutations and random $$$dp$$$ states after figuring out the sum of $$$a$$$ was $$$N - 1$$$.

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        2 months ago, # ^ |
          Vote: I like it -10 Vote: I do not like it

        To be honest, that was only an intuition during the contest, basically, for every edge you have options for which ending node you select first. Since it's a tree there will be no cycles, so it's a good ordering. My first idea was $$$N!$$$, but that didn't work with sample. Probably double counting something. Definitely not a proof, let's wait for editorial :)

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

          As _Ash__ wrote below, it's simply the number of ways to orient all edges. In different ways there are different arrays, that simply follows from a mathematical induction like one you mentioned — starting from leaves and rising up.

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

    You can transform the situation a bit like this: You have a tree, and you have to make each edge directed. The value of each node is its indegree. The problem becomes a lot more approachable now.

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2 months ago, # |
  Vote: I like it -21 Vote: I do not like it

Mama Div.2 na Div.1 dhorte parlam na je mama.!!

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

Nice round Thanks! Was the pretended solution for B brute force from n — 200 to n ? or will it give TLE in system test?

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2 months ago, # |
← Rev. 5   Vote: I like it +6 Vote: I do not like it

Difficulty in my opinion: E > B > C > D > A, B is my nightmare, the most right thing that I do is to skip B after 40 minutes of struggling.

In problem D you just need to know one trick: A string that contains n number of "a" and n-1 number of "a" separated by others (like 'bc' or 'b') can satisfy the condition.

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2 months ago, # |
← Rev. 2   Vote: I like it +1 Vote: I do not like it

Like I have wasted about an hour over B then I have come up with this solution. Link to Solution

Still, I don't know what's logic behind this solution.

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2 months ago, # |
  Vote: I like it +88 Vote: I do not like it

How to judge D...?

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    2 months ago, # ^ |
      Vote: I like it +57 Vote: I do not like it

    Just a plain suffix automata and check if every node occurs an odd number of times in $$$\mathcal{O}(n)$$$.

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2 months ago, # |
  Vote: I like it -23 Vote: I do not like it

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

nice problems with short statements!

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

I know editorial will be here soon but I can't wait how do you solve A

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

Problem statements were short and concise,but round was tough.

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2 months ago, # |
← Rev. 3   Vote: I like it 0 Vote: I do not like it

Very weird round!! A~D>B>>C>>>E.
Also for B, very hard to believe that we will not get TLE. I just took a shot of a solution which was in my mind for like an hour as anything else was not coming in mind, and fortunately it got accepted. I still don't know will it pass system test or not.

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

Another Ehab in town ?? Well I liked the problems though, worth brainstorming!

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

BIT-forces

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

It was very memorable round.

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

another div1 Contest.Hahaha

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

How did you solve B ?

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

    Check all pairs from the right-most one (N, N — 1).
    As K cannot be greater than 100 and Ai || Aj will always be strictly less than 2N, a brute-force solution should work.
    The loop is to be broken when the maximum possible value for the current pair is lower than the current max value (max. possible value would be i * j — k * 0).

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

      Thanks , I was not able to make that observation

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

    I just searched in last 1000 elements but i don't think it will pass main tests

    Edit:it did pass but barely

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

      it will pass. Check for last 200 would also lead to the same result

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

      1e7 operations should pass easily

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        2 months ago, # ^ |
        ← Rev. 4   Vote: I like it +3 Vote: I do not like it

        Well I'm searching in O(n^2) but the sum of all elements is 3e5 so it's 3e8

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

so when will the solution come out?

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2 months ago, # |
  Vote: I like it +37 Vote: I do not like it

Wow, that was a very beautiful E problem, thank you! All around the round was nice, though for me D and B should've been swapped in difficulty...

Also, codeforces is very weird with rating around 2100, it's much easier to drop to high 2000's and get a bunch of rating in div2, than to get rating in div1 with low 2100's.

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

How does titles of tasks related to each other and tasks itself?

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

Best Output Format Ever

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

RIP Bitwise-operator.

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

would rather suggest to make it unrated

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

I don't know why but Codeforces felt like Atcoder today!!

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2 months ago, # |
← Rev. 2   Vote: I like it +14 Vote: I do not like it
B
C
D
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2 months ago, # |
  Vote: I like it 0 Vote: I do not like it

https://codeforces.com/contest/1554/submission/124184154 sorry for this stupid question, but for question A, I don't understand why it get diff ans in testing, I got the correct ans in local. (g++ 14)

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

    Long is int on Codeforces testing system. Anyway, long isn't enough to keep 1e18. Use long long instead!

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

Tasks were really good, my mind became more powerful, thank you! And accept my condolences about your father.

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

A :)

B :|

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

what's wrong with my solution: 124171044

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

    for n>1000 you never compare the last 2 numbers lets say. Imagine a test with 1000 of 999 and last 2 numbers 0 and 0.

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