flamestorm's blog

By flamestorm, 2 weeks ago, In English

Hello Codeforces!

SlavicG, mesanu, MikeMirzayanov, Errichto, and I welcome you to Codeforces Round #790 (Div. 4). It starts on 10.05.2022 17:45 (Московское время).

The format of the event will be the same as before:

  • 5-8 tasks;
  • ICPC rules with a penalty of 10 minutes for an incorrect submission;
  • 12-hour phase of open hacks after the end of the round (hacks do not give additional points)
  • after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated
  • by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer).

We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants.

Only trusted participants of the fourth division will be included in the official standings table. This is a forced measure for combating unsporting behavior. To qualify as a trusted participant of the fourth division, you must:

  • take part in at least five rated rounds (and solve at least one problem in each of them),
  • do not have a point of 1400 or higher in the rating.

Regardless of whether you are a trusted participant of the fourth division or not, if your rating is less than 1400 (or you are a newcomer/unrated), then the round will be rated for you.

Many thanks to the testers: timreizin, magnus.hegdahl, Adam_GS, KrowSavcik, down, pseudocoder10, jampm, Neophiliatic, Codula and of course _Vanilla_.

We suggest reading all of the problems and hope you will find them interesting!

Good luck!

UPD: the start of the round is delayed by 10 minutes.

UPD: Editorial is published!

 
 
 
 
  • Vote: I like it
  • +240
  • Vote: I do not like it

»
2 weeks ago, # |
Rev. 2   Vote: I like it -95 Vote: I do not like it

as a tester, please give back my upvotes from previous round

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

    As a tester,I can confirm.

  • »
    »
    13 days ago, # ^ |
    Rev. 2   Vote: I like it -175 Vote: I do not like it

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    13 days ago, # ^ |
      Vote: I like it -100 Vote: I do not like it

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    • »
      »
      »
      13 days ago, # ^ |
        Vote: I like it +22 Vote: I do not like it

      MikeMirzayanov, delete this comment, and block this saboteur idiot

      • »
        »
        »
        »
        13 days ago, # ^ |
          Vote: I like it -68 Vote: I do not like it

        you're literally green and you solved over 2000 problems................................ maybe get better at coding?

        • »
          »
          »
          »
          »
          13 days ago, # ^ |
          Rev. 2   Vote: I like it +13 Vote: I do not like it

          At least he is still trying and dedicating himself to improve his skills and this makes you respect him and his effort , unlike you talking and commenting bullshi*t from another account get life bro

          • »
            »
            »
            »
            »
            »
            13 days ago, # ^ |
              Vote: I like it -31 Vote: I do not like it

            You’re cyan… just get off of codeforces because clearly competition coding is not for you… I am orange on my main and I don’t believe cyans deserve to comment :)

            • »
              »
              »
              »
              »
              »
              »
              13 days ago, # ^ |
                Vote: I like it +18 Vote: I do not like it

              Maybe competition coding is for you but clearly not codeforces community.

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

              I'm sure your life must be very unpleasant, that's why you came to the internet to find your presence.

              • »
                »
                »
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                »
                13 days ago, # ^ |
                  Vote: I like it 0 Vote: I do not like it

                and i'm sure your lift must be very pleasant, because looking at your contest history, it's clear that you are an amazing programmer!

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

      Codeforces, please add a way to hide a comment after you unhid it. Massive quality of life increase

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

omg flamestorm round

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

As a tester, I really recommend y'all to do this round it's gonna be fire!

»
2 weeks ago, # |
  Vote: I like it +16 Vote: I do not like it

As an "of course tester", I am indeed a tester

  • »
    »
    2 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Why are you chief-mentioned in every contest you test?

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

Good luck everyone!

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

another speed_force round,,, <3

»
2 weeks ago, # |
Rev. 3   Vote: I like it -20 Vote: I do not like it

[Deleted]

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

I respect all the effort from the masters and candidate masters testers, but it seems weird to have a round for participants with ratings less than 1400 tested by such high rated users, isn't it??

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

Wishing for the Worthiest get ++△.

Spoiler
»
2 weeks ago, # |
  Vote: I like it +7 Vote: I do not like it

First unrated round for me.... feeling like I'm a grand master :)

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

Ready to Participate (^ω^).

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

This will be my first unrated round

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

Good luck, everyone!

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

Hope my fingers work fast and I become Pupil this round

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

errichto finallyy :D

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

Hoping that, (A) one will get accepted by 00:00

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

not excited for yet another useless round!

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

Please no more Div4!!!

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

I hope to repeat it again

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

Shouldn't it be rated only for newbies? Greens are not completely newcomers to allow them to get boost by easy implementation problems, they have already solved a lot of them in order to reach pupil.

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

As a tester I want you guys to know that every odd number is a part of Pythagorean triplet of the form x (x²-1)/2 (x²+1)/2 (where x is odd) also (x²-1)/2 and (x²+1)/2 are consecutive numbers.

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

Time to go blue

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

Omg pseudocoder10 tester! Orz.

  • »
    »
    13 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    what does orz mean??

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

      a char picture,mean respect admire,just like ヽ(*´з`*)ノ (*'▽'*)♪ these

      • »
        »
        »
        »
        12 days ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        Thanks :)

        btw are there more of these orz(can you send me).

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

          Sure.But in order not to flood the screen,I can only post part of it.Hope you like them! happy: ✧٩(ˊωˋ*)و✧ (≧▽≦) surprise: Σ(っ °Д °;)っ (`Δ´)! angry: ╰(‵□′)╯ shy: (//∇//) debug: (ノ=Д=)ノ┻━┻ ac: (*'▽'*)♪ wa: 。゚(゚´Д`゚)゚。 hack: ψ(`∇´)ψ

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

Thank you sir for giving me enough rating for another chance to participate in div 4

»
13 days ago, # |
  Vote: I like it +23 Vote: I do not like it
»
13 days ago, # |
  Vote: I like it +3 Vote: I do not like it

hey Errichto...how's going on? You've a very good teaching youtube channel...right?

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

Div. 3 and Div. 4 are my favorite.

»
13 days ago, # |
  Vote: I like it -121 Vote: I do not like it

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

i hope that i will get more rating

GooD LucK FoR EveryonE !

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

My time has come!

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

first unrated contest.

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

We need div 4 round regularly like this.

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

ready for solve all contest problems ????

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

can someone tell me how to become tester on codeforces

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

Good luck guys!

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

How can I be a TESTER?! :)

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

guys, please follow it!!

We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants.

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

Will the round be rated for me? I was rated 1399 and registered as a rated participant. After the last div 2 round I reached specialist again. in the registrants page, that out of competition star ( * ) is not there on my name. Am I a rated participant?

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

I hope the hardest problem is not green rated otherwise full speedforces

»
12 days ago, # |
  Vote: I like it -16 Vote: I do not like it

as not a tester,give me contribution

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

first unrated round for me on codeforces. Its feels good to participate this type of contest. advance good luck for all of the newbes and pupils. hope it will be enjoyable round for everyone.

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

is there any cap on the max positive rating we can get from div4?

»
12 days ago, # |
  Vote: I like it -29 Vote: I do not like it

e236aa49858efa9da2330e82b3d41e57ca2733ba

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

Ready to Participate and hopes to perform better

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

If it wasn't for school, I would have definitely done this contest!

  • »
    »
    12 days ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    Do it from school

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

      lol, I have pe first period. I could grab my computer and hide in the bathroom, but that would be a lot of work lol

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

Good luck everyone!

»
12 days ago, # |
  Vote: I like it -16 Vote: I do not like it

I am going to become Contribution -100

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

note 5 minutes delay

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

delayed?

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

Was prepared to be the fastest guy on a wild west in fastforces and 5 min start delay haha

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

Why did the race put off?

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

DelayForces

»
12 days ago, # |
Rev. 5   Vote: I like it 0 Vote: I do not like it

it was a lie, so I removed this comment...

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

why delay wwuwuuw hahahah

»
12 days ago, # |
  Vote: I like it +12 Vote: I do not like it

5 minutes delay for cooling down the excitement ;-;

  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    super excited for my first unrated contest, also haven't been giving contest in CF for some time

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

postponed again!

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

now its 10 minutes delay :3

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

delay for the 3rd time and i am not giving the contest

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

why so delay ? joke or not?

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

Slavic round yay

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

delayed again QAQ

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

Another 5 minutes?

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

Looks like they want to reach the 30K mark :)

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

It's a good opportunity to increase rating

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

The contest put off again and again...... It's 22:40 in China now!!! I want to sleep earlier!

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

Really excited for the round

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

Is it rated?

  • »
    »
    12 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    for unrated , newbie and pupil only

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

Why is it getting delayed constantly? Anyone else facing this problem?

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

Delayed by 5 minutes again!!!

»
12 days ago, # |
  Vote: I like it -23 Vote: I do not like it

jab aukat nhi h karane ki toh kyo karate ho contest.

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

why late?

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

5 minutes delay again.

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

Anything wrong !! 5 mins delyaed in further term .. :(

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

Another delay ..

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

Holy, so many delays.

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

Use your brain: don't downvote the round just because of some as yet unknown issue that is almost certainly not the fault of any authors or coordinators.

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

What's going on?

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

Maybe they are waiting for 28K participants.

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

div 4 uwu

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

Again 5 min late Haha

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

Why delay?

»
12 days ago, # |
Rev. 2   Vote: I like it +30 Vote: I do not like it

only reason im still motivated is because of the substring kitten there

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

Note the unusual start time :)

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

sbiforces (only indians can understand)

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

However, I'm not the only person who face the problem.

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

Is it because of too much traffic?

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

Well, 10 minutes delay better than 504 error during the contest

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

Again postponed.Try not to be excited

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

I thought I could participate on school. 10 minutes delay destroy my hope and dream :(

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

Usually these delay kind of things are found on codechef, not here

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

虎酱YYDS!!!!!!

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

specialists after 1hr in div4: now we can rest

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

00:01 + 00:02 + 00:01 + 00:04 + 00:09 + 00:07 + 00:06 + 00:02 + 00:02

The submissions time of rank1, puckerbuttiampowerful, reminds me an algorithm called "three points". :(

»
12 days ago, # |
  Vote: I like it +12 Vote: I do not like it

This was very interesting and good round! Thanks for this tasks.

  • »
    »
    12 days ago, # ^ |
      Vote: I like it +10 Vote: I do not like it

    Yeah, but it is very sad that problem G was a tree problem, so I had to use bfs to solve it(

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      12 days ago, # ^ |
        Vote: I like it +25 Vote: I do not like it

      Since $$$P_i < i$$$, the traversal in reverse order from $$$n$$$ to $$$1$$$ is a topological order. Therefore you don't need BFS/DFS.

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

      Edit: Oh sorry, I noticed your unique handle just now, now I get it.

      Why is it sad if you have to use BFS/DFS in a problem?

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

Better than last div4, excellent for newbies to learn.

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12 days ago, # |
  Vote: I like it -61 Vote: I do not like it

One of my Friends warned me to never give a DIV-4 contest if u are new to coding!!

Div -4 is the worst Nightmare for actual newbie coders !! They sure get their worst ranks in div 4 !! Due to some overly smart people giving contest from new ID's. Today I can say its true!!

I don't know what fun they get by just seeing good ranks in their alternate accounts.

BYE BYE CodeForces, you got a TOXIC community out here!

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    12 days ago, # ^ |
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    get good and let's beat some overly smart people !!

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    12 days ago, # ^ |
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    you could just avoid div 4 and participate in div 2 and 3. Why leaving codeforces all together?

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

    I already guessed how toxic this community is, full of nerds , you surely showed the toxicity by down voting a genuine concern!!

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12 days ago, # |
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What is wrong with my fenwick tree. Please tell.

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12 days ago, # |
Rev. 2   Vote: I like it -35 Vote: I do not like it

Deleted

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12 days ago, # |
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The test2 of F was bothered me for a looooooooong time.......

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    12 days ago, # ^ |
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    same bruh, spend 1 hour+

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    12 days ago, # ^ |
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    what was ittttt

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    12 days ago, # ^ |
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    I mistakenly thought F meant: For every x(l<=x,x<=r), ax has to occur more than k times between l and r Find the longest segment and output l,r This is much more difficult than the correct question

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

i dont know why I've just thought of prefix suffix in D it just wasted my 40 min sad life:D most of thee time it happens with me in 2d matrix I'm not able to make an estimate that in how mush time complexity my code will work some one pls clear my doubt i just dont to repeat same mistake in next round

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

is H2 can be solved using a couple of vectors or a multiset? All I see is some trees here and there

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12 days ago, # |
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$$$O(N \log N)$$$ inversion counting in Div4? lol

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12 days ago, # |
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Here is my fenwick tree which i wrote during the contest.

why is it giving wrong answer.

My code
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    12 days ago, # ^ |
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    try long long instead of int

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    12 days ago, # ^ |
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    the answer may be up to $$$2\times 10^{10}$$$ so use long long instead of int.

    got a penalty for this too :(

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

I made a Screencast + Solutions video in case someone is interested.

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

How to solve H2 ? I had noticed that the answer is n*(n-1)/2 — number of inversions in the reversed array a. Is there an easier way ?

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    12 days ago, # ^ |
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    Inversion count can be found in $$$O(n \log n)$$$.

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

      I know this, but I'm a little suprised that so many people solved H2. Are there really a lot of people 0-1400 rated that knows such algorithm ?

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

        There are really a lot of people who know how to use Google :)

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

        I am definitely not good at CP, but I solved 1200+ problems in online judge. There will be many people who have knowledge like me.

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

        I used a comparatively different approach , for each index $$$i$$$ find the number of times value >=a[j] appear such that j<i.

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

        H2 is very similar to this problem. Many people solved it before.

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

    Take a merge sort + count inversions template from the web, change <= to <, and change int to long long, then H2 can become AC.

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    12 days ago, # ^ |
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    Just use a Fenwick tree

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

    I burned some time on bad approaches involving top/bottom pairs that ignored that the tops were unique and already sorted.

    Eventually I crawled back to doing a 2D dp brute forcer, the debug output of which pulled my attention back to those facts.

    From there it was pretty straightforward to replace the inner loops with any range sum thingy so I copypasta'd a BIT.

    Funny/headdesk thing is my source for that was part of my inversion counting scratch code/notes, despite not having explicitly made the overall observation.

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

    There's also and interesting solution using trie (not sure if it's well known). Here's my submission with such approach if you're interested:

    https://codeforces.com/contest/1676/submission/156746831

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

    You can also use a Segment/Fenwick Tree to solve the problem

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

how to solve H2? I have tried using multiset but it is showing TLE. Can anyone please give me any hint? Please put your hint inside spoiler tag.

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12 days ago, # |
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bro is it really div 4? xD

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

Very Nice and educational Problem .. this is how really div 4 should be
kudos to the authors

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

In the last 20 seconds i was about to submit my solution for H1... but it didn't load .I have a stable network but i didn't load then i had to submit it just 10-30 sec after the contest ended and got Ac. Please make sure that your servers act more fast ..... I wanted to do good badly but because of the servers ..........Felt bad so i expressed it i know many people can relate to it !

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

    Believe it or not, exactly the same thing happened to me! I submitted when there were like 10 seconds left.

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

i dont know why I've just thought of prefix suffix in D it just wasted my 40 min sad life:D most of thee time it happens with me in 2d matrix I'm not able to make an estimate that in how mush time complexity my code will work some one pls clear my doubt i just dont to repeat same mistake in next round

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12 days ago, # |
  Vote: I like it -17 Vote: I do not like it

Too easy.Solve all in 34 minutes.Wish there will be more harder contests instead of easy dishes like this one...

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

It was fun! I still have too much to learn and improve. More Div4 please. Thanks for the authors.

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12 days ago, # |
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Oh yeah, this is the first time I can solve all the problems. Only mistake was to spend about 40 minutes on problem D because I let loop j go to n instead of m.

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12 days ago, # |
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I love you, Mike

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

For problem H2 in this contest, I knew the answer is just the number of inversions in the array, from solving H1. Since this is quite a popular question, is it ok to use the merge-sort implementation from Geeks for Geeks? I also gave credit to the website in a comment.

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

Nice round. It can be a nice idea if a new account needs at least 3 rated division-2 contests and solve at least one problem in each of them to be rated in a div 4 contest. Then many alts could have been removed and the actual ones could have got their deserved places. Again nice work by the authors.

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

My video editorial: https://youtu.be/98QD80PNA0Y

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

Why does my score not appear as "official", even if I have a rating of 1365?

I first thought it was because I have had a rating of more than 1400 in the past, but I have seen others which are official, and had ratings above 1400.

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12 days ago, # |
  Vote: I like it -24 Vote: I do not like it

trash contest

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

    trash comment

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

      trash reply(including mine)

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

      get off of codeforces because looking at your rank, clearly coding is not for you

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        12 days ago, # ^ |
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        Ahahahaha! You poor thing.

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          12 days ago, # ^ |
            Vote: I like it -17 Vote: I do not like it

          No Offense, but I can't help it LOL. Let’s put the Taiwan China thing aside. You wrote "I think that you should improve your English level first before speaking English".

          But I see 12 edits and still lots of grammar errors in your reply.

          My English is bad, but it seems like Your English level is even more shit in my opinion LOL. You had better go back to elementary school, my friend. Sorry!

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

This is my first contest to solve in, i just want to know when do i get a rating? i solved 3 problems and i thought i'd get a rating after the contest ends since i am unrated. any clarification would be appreciated thanks

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

    There is 12 hours for hacking in this contest so rating will be updated after 12 hours

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

    Ratings are usually updated a few hours after the contest, but since this contest has an open hacking phase which lasts 12 hours, you'll have to wait at least 12 hours more for your new rating.

    Good luck!

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

    First,you have to wait 12 hours since this contest need to be hacked. Then,you have to wait some hours since each submission need to be retest by more data(especially the hack data). Finaly,you only have to wait some hours again since the contest need time to calculate our rate.

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

5-8 tasks ?

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

Apologies if this was addressed before.

How are the rankings calculated in Div. 4 rounds?

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    12 days ago, # ^ |
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    based on your performance

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      12 days ago, # ^ |
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      I mean, how is performance calculated? Because there seems to be no score for each problem.

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        11 days ago, # ^ |
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        Based on how many problems you solved. If two participants solved the same amount of problems they are compared by time penalty

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          11 days ago, # ^ |
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          So all problems hold equal scores? Thank you

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

best contest i have ever enterd thanks for the authors

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

Won't anyone talk about the person who finished the contest in less than 9 minutes alone? The 1st place, btw this is my first rated round.. I'm just dazed

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

    He solved five problems within 3 mins, that's an average of 36 seconds per question. I don't think it's possible by one person

    36 seconds isn't even sufficient to read the whole question, so unless he already knew the questions beforehand, I think it's a high chance the first rated is done by a team instead of an individual

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

      Maybe he is one of the writers or testers of the contest and he just created a fake account and submitted the solutions.

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

Can someone please help me out, I don't know why when I untick the show unofficial in standings it doesn't show a + for my A&B ques, it shows for the rest of the ques?

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

I'm sorry this was my first contest, this div4 contest is coming under an unrated contest, so for this contest, Will I not get any rating?

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

In Problem F, I use the unordered_map to store the data, but my code has been hacked. Can anyone tells me, why unordered_map is slower than map in C++.

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

    u can refer to this blog

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

    Never use unordered_map in codeforces contests.Actually the time complexity is unstable,and in addition it will surely be hacked by some "interesting" coders.

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

    I hacked your sol the reason is collision, in case of collision the time of search goes from O(1) to O(n) because the c++ handle collision in a linear data structure unlike that of Java which use AVL tree, so either use map ot custom hashing

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    11 days ago, # ^ |
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    Ok, Got it. Thanks a lot for all of above help!

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12 days ago, # |
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My solution for Problem E was correct when I submitted it during the contest yesterday, but now after the system testing, it is showing as wrong. Does anyone know why is that so? :( (My solution even matches the one they explained in the editorial, idk why this happened)

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    12 days ago, # ^ |
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    It is again tested with the test case use in hacks, you have to find the test case for which it is failing, maybe it's small implementation issue

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12 days ago, # |
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Time limit was too strict on F and editorial solution on python TLE's

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12 days ago, # |
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Hii i am newcomer.. till now i have given 4 rated rounds and my rating is less than 1000… will i get rating for this round???

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12 days ago, # |
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Hm, strange, why I am not still rated

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12 days ago, # |
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Is this contest unrated?

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    12 days ago, # ^ |
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    They said it is rated

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

      Go to your account page and see all the contest you have participated in you will see that it showing there that this contest in unrated

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      12 days ago, # ^ |
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      who said?

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    12 days ago, # ^ |
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    This contest is rated for you as stated in the announcement. Just be patient.

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

I wonder what differentiated the TLE solutions and the AC solutions for question F when using pypy 3-64, around 85% of the accepted solutions for F in pypy3-64 either got hacked or TLE on test 22 in system testing

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

I solved 8 questions and it showed up perfectly fine in the unofficial standings section but in the official section it is showing that i only solved 4 questions and my rank is considered accordingly i.e 8000 which should have been around 700 or something in reality. This codeforces glitch will cost me my rating. Please resolve this glitch.

I have uploaded the images for proof...

link to unofficial ranking: https://photos.app.goo.gl/AzGA6H6yN9oKPbae7

link to official ranking:https://photos.app.goo.gl/rJwGDBkcw6wX8yEV8

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

Everybody whose rating is less than 1400 will have a rating change after this round. You guys gotta be a bit patient, everything will be completed very soon. Currently all submission are being reviewed with new (added from hacking stage) test cases.

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    12 days ago, # ^ |
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    Please be quicker... I was in bad emotions because of that for near half a day!

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      12 days ago, # ^ |
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      You will surely become a specialist so I congratulate you!

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        12 days ago, # ^ |
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        thanks, but that problem really worries me a lot

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12 days ago, # |
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Tested code in ideaone and kept it on public unknowingly (since my laptop was running slow during the contest). Codeforces sent mail saying two of other codes match my code. Will my rating be affected by this?