flamestorm's blog

By flamestorm, 3 years ago, In English

Hello Codeforces!

SlavicG, mesanu, MikeMirzayanov, Errichto, and I welcome you to Codeforces Round 790 (Div. 4). It starts on May/10/2022 17:45 (Moscow time).

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, qwexd, 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

| Write comment?
»
3 years 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

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

    As a tester,I can confirm.

  • »
    »
    3 years ago, # ^ |
      Vote: I like it -100 Vote: I do not like it

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      3 years ago, # ^ |
        Vote: I like it +22 Vote: I do not like it

      MikeMirzayanov, delete this comment, and block this saboteur idiot

      • »
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        »
        3 years 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?

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          »
          3 years 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

          • »
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            »
            3 years 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 :)

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

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

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              3 years 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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      »
      3 years 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

»
3 years ago, # |
  Vote: I like it +19 Vote: I do not like it

omg flamestorm round

»
3 years 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!

»
3 years ago, # |
  Vote: I like it +16 Vote: I do not like it

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

  • »
    »
    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

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

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Good luck everyone!

»
3 years 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??

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

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

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

This will be my first unrated round

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

»
3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

Hope my fingers work fast and I become Pupil this round

»
3 years ago, # |
  Vote: I like it +4 Vote: I do not like it

Please no more Div4!!!

»
3 years 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.

»
3 years 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.

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Time to go blue

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Omg pseudocoder10 tester! Orz.

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    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    what does orz mean??

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

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

      • »
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        3 years ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        Thanks :)

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

        • »
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          »
          3 years 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

»
3 years 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

»
3 years ago, # |
  Vote: I like it +23 Vote: I do not like it
»
3 years 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?

»
3 years ago, # |
  Vote: I like it -121 Vote: I do not like it

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»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

first unrated contest.

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

.

»
3 years 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?

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

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

»
3 years 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.

»
3 years 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?

»
3 years 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!

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

    Do it from school

    • »
      »
      »
      3 years 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

»
3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

note 5 minutes delay

»
3 years 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

»
3 years ago, # |
  Vote: I like it +10 Vote: I do not like it

DelayForces

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

why delay wwuwuuw hahahah

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

5 minutes delay for cooling down the excitement ;-;

  • »
    »
    3 years 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

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

postponed again!

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

now its 10 minutes delay :3

»
3 years ago, # |
  Vote: I like it -22 Vote: I do not like it

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

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

why so delay ? joke or not?

»
3 years ago, # |
  Vote: I like it +10 Vote: I do not like it

Another 5 minutes?

»
3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

It's a good opportunity to increase rating

»
3 years 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!

  • »
    »
    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    me, too. I have to go to school tomorrow (at 6:30)

  • »
    »
    3 years ago, # ^ |
      Vote: I like it +23 Vote: I do not like it

    you can finish it in 30 minutes and get to sleep:)

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Is it rated?

»
3 years 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.

»
3 years ago, # |
  Vote: I like it +1 Vote: I do not like it

Maybe they are waiting for 28K participants.

»
3 years 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

»
3 years ago, # |
  Vote: I like it +4 Vote: I do not like it

Note the unusual start time :)

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

sbiforces (only indians can understand)

»
3 years 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 :(

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

specialists after 1hr in div4: now we can rest

»
3 years 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". :(

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

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

  • »
    »
    3 years 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(

    • »
      »
      »
      3 years 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.

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

Better than last div4, excellent for newbies to learn.

»
3 years 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!

  • »
    »
    3 years ago, # ^ |
      Vote: I like it +14 Vote: I do not like it

    get good and let's beat some overly smart people !!

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

    you could just avoid div 4 and participate in div 2 and 3. Why leaving codeforces all together?

  • »
    »
    3 years 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!!

»
3 years ago, # |
Rev. 2   Vote: I like it -35 Vote: I do not like it

Deleted

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

The test2 of F was bothered me for a looooooooong time.......

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

    same bruh, spend 1 hour+

  • »
    »
    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    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

»
3 years 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

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

$$$O(N \log N)$$$ inversion counting in Div4? lol

  • »
    »
    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    idea matters, there are so many implementations on web

»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Here is my fenwick tree which i wrote during the contest.

why is it giving wrong answer.

My code
  • »
    »
    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    try long long instead of int

  • »
    »
    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    the answer may be up to $$$2\times 10^{10}$$$ so use long long instead of int.

    got a penalty for this too :(

»
3 years ago, # |
  Vote: I like it +10 Vote: I do not like it

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

»
3 years 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 ?

  • »
    »
    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Inversion count can be found in $$$O(n \log n)$$$.

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      3 years ago, # ^ |
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      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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        3 years ago, # ^ |
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        There are really a lot of people who know how to use Google :)

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        3 years ago, # ^ |
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        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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        3 years ago, # ^ |
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        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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        3 years ago, # ^ |
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        H2 is very similar to this problem. Many people solved it before.

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    3 years ago, # ^ |
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    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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    3 years ago, # ^ |
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    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.me/contest/1676/submission/156746831

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    3 years ago, # ^ |
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    You can also use a Segment/Fenwick Tree to solve the problem

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3 years ago, # |
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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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3 years ago, # |
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Very Nice and educational Problem .. this is how really div 4 should be
kudos to the authors

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3 years ago, # |
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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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3 years 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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3 years ago, # |
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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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3 years ago, # |
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My video editorial: https://youtu.be/98QD80PNA0Y

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3 years ago, # |
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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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3 years ago, # |
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trash contest

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3 years ago, # |
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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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    3 years ago, # ^ |
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    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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    3 years ago, # ^ |
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    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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3 years ago, # |
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5-8 tasks ?

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3 years ago, # |
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Apologies if this was addressed before.

How are the rankings calculated in Div. 4 rounds?

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    3 years ago, # ^ |
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    based on your performance

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      3 years 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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        2 years 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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3 years ago, # |
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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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    3 years ago, # ^ |
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    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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3 years ago, # |
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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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    3 years ago, # ^ |
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    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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    3 years ago, # ^ |
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    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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3 years 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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    3 years 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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3 years ago, # |
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Time limit was too strict on F and editorial solution on python TLE's

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3 years ago, # |
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Is this contest unrated?

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

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3 years ago, # |
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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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3 years ago, # |
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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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3 years 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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    3 years 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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      3 years ago, # ^ |
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      You will surely become a specialist so I congratulate you!

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3 years 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?

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

I got a message from the system: "Your solution 156649522 for the problem 1676B significantly coincides with solutions srikaran_p/156626664, steve004/156649522."
Here steve004 is my this account itself. It is really a coincidence that my code matched with srikaran_p's code. We both use the same template as we are friends and we both code in c++ (you can verify that our templates are the same by seeing our submissions for other problems). And since the question was a very trivial one, our codes coincidentally match. We didn't cheat or share our codes with each other.

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3 years ago, # |
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I solved all nine problems in 105 minutes with the "penalty" of 434. But the system said I achieved 501st place. According to the solves and the penalty, I should be 244th. And when I checked the "standings", I couldn't find myself anywhere. Can anyone help me explain that?

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

I am really surprised to see my submissions to this contest got skipped. I got this message:

Your solution 156694985 for the problem 1676D significantly coincides with solutions Aparna-Sakshi/156689249, karthikmv14/156694985. Such a coincidence is a clear rules violation.

I really don't know the person girl_on_fire before and I strongly know that this is purely coincidental and I guess in python this matching can happen with more probability as the solution is simple.

My solution

Her solution

Another question is why she is rated for this contest and I got this message? If your system thinks I cheated, then it might mean that she leaked her solution unintentionally/intentionally. Anyway my message is that I haven't copied from anywhere as this problem itself is quiet simple.

please look into it. Thanks.

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    3 years ago, # ^ |
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    Even I got the message, but I don't know about the rating part(probably some system error). But this is a pure coincidence. I have neither cheated nor leaked the solution to anyone/anywhere.

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3 years ago, # |
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I hope the problems are a little more difficult Thanks to everyone for their efforts :)

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2 years ago, # |
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Hi, Can anyone please explain the problem F. why 13,14 is picked instead of 11,14? Since both 11 and 14 occur 2 times and their difference will be maximum.?

Similarly in the sample test case given 5 1 6 3 5 2 1 Why 1 and 3 are selected instead of 1 and 6?

and in this sample test case: 14 2 1 1 2 2 2 3 3 3 3 4 4 4 4 4 1 and 4 are selected... Please don't give any hint or answer I want to solve this but am unable to understand the problem statement.

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    2 years ago, # ^ |
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    It's mentioned in the problem statement: For each $$$x (l \leq x \leq r)$$$, $$$x$$$ appears in $$$a$$$ at least $$$k$$$ times (i.e. $$$k$$$ or more array elements are equal to $$$x$$$).

    So, not only $$$l$$$ and $$$r$$$ values should appear at least $$$k$$$ times, but also all the values in between.

    In the first sample, $$$ l = 11, r = 14 $$$ is not correct because the condition for $$$12$$$ fails (it appears only once).