SecondThread's blog

Meta Hacker Cup 2023 Round 1
By SecondThread, history, 13 months ago, In English

Meta Hacker Cup Round 1

Good morning! Meta Hacker Cup Round 1 starts on Saturday, October 7th at 10:00 AM Pacific in under 48 hours! Anyone can register for Round 1 this year, even if you haven't participated in the practice round.

Important info:

  • To qualify for Round 2, you must solve at least one problem in this round. (Due to having too many submissions in the early part of the contest, we relaxed this requirement from the earlier one of needing to place in the top 5000 of the round)
  • The contest will be 3 hours.
  • As usual, you may not discuss solution ideas or code until after the contest hours is over. It's your responsibility to make sure that your code is not leaked. We'll DQ contestants if we have reason to believe they shared code or solutions with others.

Hacker Cup Round 2 Conflict with ICPC Regionals and WPC

Round 2 will overlap with some ICPC regionals and the World Puzzle Championship. For people able to prove that they will attend an official International Collegiate Programming Contest (ICPC) or World Puzzle Championship (WPC) during the day of the Round 2, it will be possible to get a bye from Round 2 and go directly to Round 3.

To get the bye you must attend one of the events during the day of Round 2 and finish in top 500 in Round 1. At most 50 contestants will get a bye; if more than 50 qualify, only the best 50 of them in Round 1 will qualify. To be considered for a bye, send an clarification request before Round 1 with the word "ICPC" or "WPC" followed by your name. We will later validate your status for the bye.

Prizes

T-shirts will be awarded to top participants based on performance in Rounds 2 and 3. Contestants who do not qualify for Round 2 cannot earn a prize. More prize details will be announced after Round 1.

We’ve put a lot of work into these problems, and we hope you enjoy the contest. Good luck, and see you on the scoreboard!

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

Comments Comments (290)
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13 months ago, # |
  Vote: I like it -80 Vote: I do not like it

is it rated?

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    13 months ago, # ^ |
      Vote: I like it +56 Vote: I do not like it

    we are div4, we don't ask for rated, rated ask for us

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      13 months ago, # ^ |
        Vote: I like it -68 Vote: I do not like it

      ?detar ti si

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

        It depends upon what's your rate

        Spoiler
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          13 months ago, # ^ |
            Vote: I like it -71 Vote: I do not like it

          I'll write "is it rated?" even when I'll become GrandMaster. It's just funny joke for me don't know why people downvote it.

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

            Become GM and comment the same thing, you will get the reverse thing xD

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

              GM is hard to be I'll stick to my goal Master

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

Earlier Round 1 was used to be 24 hrs long, any specific reason you changed it to 3 hrs?

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13 months ago, # |
  Vote: I like it +54 Vote: I do not like it

Will the byes affect the number of R3 slots that can be earned by competing in R2? For example, let's say fifty people receive byes: will only the top 450 (rather than top 500) advance from R2 to R3?

I'm guessing the answer is no and that the top 500 in R2 will qualify for R3 as in previous years (and thus slightly more than 500 people will compete in R3), but I wanted to confirm in advance since this doesn't seem obvious from the blog post.

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    13 months ago, # ^ |
      Vote: I like it +69 Vote: I do not like it

    They will not. Up to 550 people might be part of round 3.

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

"Contestants who do not qualify for Round 2 cannot earn a prize", just to clarify, who applies for the bye and goes straight to Round 3 is still eligible for Prizes right? Also, what about if someone applies for the bye and ranks between [501,5000]? I assume they do not advance to round 2 either, right?

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    13 months ago, # ^ |
    ← Rev. 6   Vote: I like it 0 Vote: I do not like it

    For ICPC Taoyuan regional, I also want to note that the time for MHC in UTC+8 is midnight 25:00.
    Therefore, it's still possible for people attending Taoyuan Regional to participate in MHC R2 if they give up (some of) their sleeping right before the real ICPC.

    Upd: According to this, there wouldn't be a second chance, so you should think twice before requesting a bye.

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

Can I check will the top X participants of round 2 already be given t-shirts? Or are the t-shirt winners only decided after round 3? Could you specify the value of X upfront? The contests are all 1-4am in East Asia timezones and I want to estimate my chances and whether it is worth doing 2 or 3 contests at 1-4am in the middle of so many precious weekends as a working adult... Thank you!

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

    You’ll know whether or not you’re winning a shirt at the end of Round 2. If you qualified for Round 3, your performance in Round 3 will determine whether your shirt has a “Top 200” badge on it or not.

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13 months ago, # |
← Rev. 3   Vote: I like it +40 Vote: I do not like it

That's a terrible rule.

I feel that placing in the 500th place in a round where 5,000 people can pass does not guarantee the ability to place in the 500th place in a round where 500 people can pass.

Also, https://codeforces.net/blog/entry/121073?#comment-1074629 According to this comment, even if they fail bye, they can increase their chances by reducing their sleep time.

If the top 50 people who don't participate in ICPC regionals or WPC could also Bye, I think the fairness would improve a little bit and fun...

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    13 months ago, # ^ |
      Vote: I like it +11 Vote: I do not like it

    I think one should be careful to ask for bye. If you ask for bye and from my interpretation of the rule, you cannot qualify to round 2 (top 5000), you can only qualify to the bye straight to round 3 (top 500 at least). Also if there are 1k Tshirts to be given in round 2, you decrease the chance of getting it by asking for the bye. Plus if you dont really qualify for the bye (that is, you are not attending the events mentioned) you might get disqualified.

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    13 months ago, # ^ |
      Vote: I like it +16 Vote: I do not like it

    If you request and fail the bye, we won’t give a second chance in round 2. Additionally, if it’s a widespread occurrence, the bar for getting a bye will rise proportionally, and you may have to place much better than top 500 in round 1 because of the top 50 constraint.

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    13 months ago, # ^ |
      Vote: I like it +90 Vote: I do not like it

    How is that important? What would one gain from getting to participate officially in Round 3? If someone is not good enough to consistently get into top-500 surely they have no chance of qualifying for the finals. Nobody is unfairly taking anybody's place in Round 3, as top-500 from Round 2 are advancing anyway.

    I want to thank the organisers for such a foresight! It does not affect me in any way, but I would be grateful to have this opportunity in a different situation.

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

what about pants?? :sob:

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

excited

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

On https://www.facebook.com/codingcompetitions/hacker-cup/2023/round-2, it still reads "Welcome to Round 2 of Meta Hacker Cup. You can only qualify for this round by earning enough points in Round 1." — which contradicts "To advance to Round 2, you must place amongst the top 5000 contestants in this round."

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

Reminder: round starts in 5 hours, open to everyone with prizes, ask for a bye BEFORE THE ROUND STARTS if you are eligible

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

The trial day of the Polish icpc subregionals is on the same day as MHC round 2. The real contest is on Sunday. Does that count towards the bye? Are organizers included?

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

    I am a MHC organizer but while I cannot guarantee this (will confirm later), I think what you mentioned should be eligible for the bye. Also coaches, contestants and judges/organizers are eligible for the bye.

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

    It's the MHC round 3 that collides with the Polish icpc subregionals, not MHC round 2.

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

Does Polish Collegiate Programming Contest count towards bye?. It is listed on https://icpc.global/regionals/upcoming.

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

    No. Round 2 happens on October 21st. That happens on November 3rd to 5th.

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

      I read it wrong, my bad.

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

      By when will the clarification submissions be judged?

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

        They will most likely not be rejudged. I suggest you to resubmit (It is possible)

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13 months ago, # |
  Vote: I like it +202 Vote: I do not like it

Hi! I get "Error performing query." when trying to validate, any idea what might cause this?

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13 months ago, # |
  Vote: I like it +183 Vote: I do not like it

Is anyone else having problems with final submissions?

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13 months ago, # |
  Vote: I like it +98 Vote: I do not like it

Validate solution is not working for me. It's saying error performing query. Anyone else?

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13 months ago, # |
  Vote: I like it +32 Vote: I do not like it

Anybody else facing issues on submitting?

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13 months ago, # |
  Vote: I like it +61 Vote: I do not like it

broken servers

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

I get error when downloading grading file

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13 months ago, # |
  Vote: I like it +27 Vote: I do not like it

i cannot submit a

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13 months ago, # |
  Vote: I like it +52 Vote: I do not like it

Are samples not loading for anyone else?

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13 months ago, # |
  Vote: I like it +11 Vote: I do not like it

I got error performing query.

why??

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

server's struggling to show samples too...

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

Sample input & output just disappear. Previously, I can see them, but now I can't.

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

Same error performing query:(

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

I can't find sample input output

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

It just won't let me submit my sol for A and my timer ran out.

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

Its showing error performing query while I am trying to validate A

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

Unable to download validation input data

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

Directly downloading the input for A gives corrupt input (it says 20 cases but there are only 19 in the file!). I download it again and finally the input is not corrupt. Then I can't submit! "An error occurred on our end", submission timer expired... Please help.

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13 months ago, # |
  Vote: I like it +40 Vote: I do not like it

I guess now we know the real reason of 24h and 72h preliminary rounds...

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13 months ago, # |
  Vote: I like it +48 Vote: I do not like it

Beautiful work facebook team, absolutely beautiful.

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

I am unable to have the input validation work (at least for B).

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

Getting "error performing query" after submitting validation output for B1

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

pretty sad to start this eagerly waited round with such technical problems...

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

It shows that 12 validation test cases in problem A, but only 11 cases seen.
Also, could you remove the blank line between the test cases please? python will have an error when reading it.

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

I'm unable to submit validation output. Saw:

Something Went Wrong

Error performing query.
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    13 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Just refresh the page. It helped in my case. But the validation input is incorrect. It states there are 12 testcases. But it was 10 and 5 (I downloaded it twice — two different inputs).

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

The samples are not showing up for me. Can somebody post the samples of the second problem.

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

    3
    7
    1 17 3 13 7 23 12
    5
    5 4 3 2 1
    4
    10 100 1000 10000

    Case #1: 18
    Case #2: 2.5
    Case #3: 5445

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

    I have the same problem

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

Getting 'error performing query' on validating output of A

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

I don't know whether I should laugh or be sad that the the "click here" for "An annnouncement has been posted by the organizers." doesn't work lol.

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

    It says the following. You can access it from the Home page (above scoreboard).

    Contest Announcement We're experiencing so many submissions that some appear to be failing. If you get an error when trying to upload your source code and output, please make a clarification request instead that includes both your source code and output for the problem you're unable to submit to.

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

On downloading the validation input, it is showing error!!

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13 months ago, # |
  Vote: I like it +168 Vote: I do not like it

We're experiencing so many submissions that some appear to be failing. If you get an error when trying to upload your source code and output, please make a clarification request instead that includes both your source code and output for the problem you're unable to submit to.

I (maybe we?) cannot validate our solution so even I can't download the full test...

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

They are saying to raise clarification in case of issue in submitting the problems, but how to submit when even validation isn't working?

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

It's not working!

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

can anyone give me sample I/O of problem A please?

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

    I believe that would violate the rules

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      13 months ago, # ^ |
        Vote: I like it +26 Vote: I do not like it

      how? sample I/O is public information during contest

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        13 months ago, # ^ |
          Vote: I like it -56 Vote: I do not like it

        It gives you much more time for computing then intended. Everybody would bruteforce half of the problems that way :/

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

How do I make a submission without validating my output on validation data? Help can't make a single submission!!!!!

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

After Clicking Validate it shows:["Error Performing Query"]

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

Unfortunately, result of Meta layoffs?

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

Validation test for problem A appears to be wrong? T is 12 but there are only 11 cases

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13 months ago, # |
  Vote: I like it +132 Vote: I do not like it

Is it rated?

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

Looks like I'm repeatedly getting "Sorry, something went wrong. We're working on getting this fixed as soon as we can. Go Back" whenever I'm trying to Validate Solution & Submit

Anybody else facing this issue?

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    13 months ago, # ^ |
      Vote: I like it +19 Vote: I do not like it

    The question probably would be anybody not facing this issue...

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13 months ago, # |
← Rev. 3   Vote: I like it +30 Vote: I do not like it

Guess layoff really hurts everyone. Anyone able to get anything correct? Please make it unrated!

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13 months ago, # |
  Vote: I like it +147 Vote: I do not like it

Seem like the 24 hours round 1 of previous years was good for reducing load on the server.

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    13 months ago, # ^ |
      Vote: I like it +79 Vote: I do not like it

    That sounds a little weird to me. Meta is not running our solutions, only comparing outputs. How many submissions can there possibly be that the server can't handle them?

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      13 months ago, # ^ |
        Vote: I like it +19 Vote: I do not like it

      It's still handling lots of requests I suppose.

      Multiple people downloading a personalized 2MB file is not trivial.

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13 months ago, # |
  Vote: I like it +36 Vote: I do not like it

error performing queryyyyyy

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

what will happen then? Will it be rescheduled or what? I cant seem to be able to submit the solution

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13 months ago, # |
  Vote: I like it +149 Vote: I do not like it

codeforces >>> meta hacker cup

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

I cannot see the samples.

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

What the hell is going on? error performing query??

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

still rated?

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13 months ago, # |
  Vote: I like it +159 Vote: I do not like it

how about making it 24 hours while it's not too late?

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    13 months ago, # ^ |
      Vote: I like it +24 Vote: I do not like it

    Yeah, probably it's a good idea!

    And, keep a minimum passing score instead of top 5000, so that time doesn't matter anyways.

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13 months ago, # |
  Vote: I like it +27 Vote: I do not like it

It's Not Happening!

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

is there any way you can submit? I am getting error performing query!

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

What the zuck happened?

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

would've better host in cf

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

Looks like round 1 really escalated in the wrong direction

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13 months ago, # |
  Vote: I like it +62 Vote: I do not like it

The sample input for B1 does not have enough test cases.

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

    I cannot download the validation input

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

      I downloaded validation input but it does not have enough testcases either lmfao.

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

      I did but it ended up being corrupted with empty lines as well

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    13 months ago, # ^ |
      Vote: I like it +6 Vote: I do not like it 
    7
2023
114
41
175
434
666
1872

    This is the full sample input I copied earlier.

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      13 months ago, # ^ |
      ← Rev. 3   Vote: I like it 0 Vote: I do not like it 
      16
2023
114
41
175
434
666
1872
39
123456789
100
61
112500
419904
1320
999999000
12

      Here are the full samples

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

        Thanks, though I've already downloaded them. Also use

        ```
        your input
        ```

        to keep input within codeblocks.

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

      Could you send the output too

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

        wtf

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

        Sorry, can't send, my output isn't the same, and can spoil the solution of the problem.

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

    You can see the samples? Lucky duck.

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

    the testcase is fine. it's just not loading properly now

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13 months ago, # |
  Vote: I like it +47 Vote: I do not like it

I can't even see the sample input for any problem, before it was visible now I can't.

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

Can you all see Sample Input and output?

for me its I/O format then Sample explanation

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

    Same problem for me, it shows after 3 — 4 refreshes though

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

Can anyone provide the contents of the input file which many of us couldn't download please?

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13 months ago, # |
  Vote: I like it +70 Vote: I do not like it

OMG, I failed to DL B1's validation. Sorry to say, but I guess the only choice is aborting the round.

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13 months ago, # |
← Rev. 2   Vote: I like it +24 Vote: I do not like it

For problem B1 validation input is not in correct format (some testcases are missing and have been replaced by blank symbols!)

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

It'll be cool if this round now gets rescheduled to some later date.

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13 months ago, # |
  Vote: I like it +70 Vote: I do not like it

Now I even can't see sample input and output of the problems.

What is going on?

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13 months ago, # |
← Rev. 2   Vote: I like it +46 Vote: I do not like it

I have been unable to get my validation output checked for 40 minutes now and have not been able to submit it at all. The same for problems B and C as well. I think it is only reasonable to invalidate this round and reschedule it later or have combined round 1+2

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13 months ago, # |
  Vote: I like it +245 Vote: I do not like it

Problem D: Today is Gonna be a Great Day

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

Is Anyone Able to Validate A, B1, B2?

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

I stayed up to 1 am, please don't tell me I have to stay up to 1am on another extra weekend...

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

It's been 45 minutes and it's still not working so unfair 303 people have made submissions I can't even make a single submission because of validation errors!

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13 months ago, # |
  Vote: I like it +144 Vote: I do not like it

SecondThread rn

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13 months ago, # |
  Vote: I like it +397 Vote: I do not like it

Rank: 305th out of 19 781

I think we are all advancing to Round 2.

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13 months ago, # |
  Vote: I like it +56 Vote: I do not like it

it's almost 3am here and i guess there's no risk in going to bed right now....

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13 months ago, # |
← Rev. 2   Vote: I like it +31 Vote: I do not like it

Sorry but imagine if they had to run our code on their server LOL.

--edit: They're back! Yay!!!

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

    And we have Codeforces that gives judgements within seconds.

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13 months ago, # |
← Rev. 2   Vote: I like it +8 Vote: I do not like it

Yeah this is unfortunate, hopefully they can resolve the issue soon.

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

    I hate this pop-up from now on ~

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

Mine downloaded validation input not even in correct format.

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

Lost the urge to see other problems as can not even validate one. The contest is totally ruined -_-

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13 months ago, # |
← Rev. 2   Vote: I like it +55 Vote: I do not like it
Spoiler
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13 months ago, # |
  Vote: I like it +16 Vote: I do not like it

Does anyone else see:

Something Went Wrong Error performing query.

?

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13 months ago, # |
  Vote: I like it +143 Vote: I do not like it

Metaproblems are too difficult to solve

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

meta be like: we have metaverse, bla bla bla.......... BUT cannot have good server like google codejam. I am not even able to validate test cases. Shame on Meta

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

I am not able to download even input files for problem B1

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

Is this the first time that Meta experienced too many submissions in Round 1? We were not able to make submissions in the first hour at least.

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

Based on the issues here, I think this round should be cancelled with another round to be rescheduled in a later date, or if that's not possible, then all registered contestants should qualify to Round 2.

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13 months ago, # |
  Vote: I like it +64 Vote: I do not like it

We all got a literally bye from the system

... It's almost 3AM in GMT+9. Please just tell me whether I can go to bed or not...

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

wtf is this contest. nothing is working. didn't expect this from facebook. maybe this is the reason why nobody uses facebook.

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

right now, why they don't give an announcement?

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

Validating input works for me now, but what good is that if we don't have complete input.

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

Can anyone please paste samples for A?

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

    3 7 1 17 3 13 7 23 12 5 5 4 3 2 1 4 10 100 1000 10000

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    13 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it 
    3
7
1 17 3 13 7 23 12
5
5 4 3 2 1
7
1 2 3 4 5 6 7

    18
2.5
5445
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13 months ago, # |
  Vote: I like it +25 Vote: I do not like it
Mood rn
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13 months ago, # |
  Vote: I like it -8 Vote: I do not like it

I would love it if someone could explain how to prevent and quickly solve such problems.

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

It won't let me submit B1, the timer will run out again

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13 months ago, # |
  Vote: I like it +42 Vote: I do not like it

I thought codeforces servers are bad until I participated in this contest, Thank you mike.

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

I am still getting Error performing query.

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

My timer started, but when I try to submit I get an error message :(

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

    Submit a clarification with output and source code

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

Worked, I tried it, got WA, tried again and doesn't work again :)

Clearly frozen, standings aren't progressing...

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

I thought Metaverse is already the worst thing that Meta had ever made until I participate in this round.

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

Still getting error performing query on validation for A

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13 months ago, # |
← Rev. 2   Vote: I like it +19 Vote: I do not like it

Don't submit.

It finally let me get validation input, and it passed. Then, I tried against actual input and it says there is a server error. And so, I wasted an attempt.

also, please let everyone advanced to R2. Not fair because of tech difficulties imo.

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    13 months ago, # ^ |
      Vote: I like it -14 Vote: I do not like it

    Yes and to balance out frustations, please provide T-Shirts to all.

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

      um what? round 2 will determine t-shirts

      imo, when there are serious server errors, it is not the fault of the contestant and the round should be unrated/postponed/etc.

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

    Then, I tried against actual input and it says there is a server error. And so, I wasted an attempt.

    Did you read the announcement?

    If you get an error when trying to upload your source code and output, please make a clarification request instead that includes both your source code and output for the problem you're unable to submit to.

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

Right now tbh I feel like they should have hosted this on codeforces itself...

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

why i have only 8 cases in input?

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

working fine with VPN, I tried with Proton VPN (Netherlands).

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

It worked for a moment but then again stopped...

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

I downloaded the C1 validation input two times and got different inputs each time. Did anyone else face the same issue?

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

    The same happened to me for problem B. One line of the input is always missing

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

    Yep wasted half an hour getting wrong answer downloaded the input again and passed.Thanks for the comment.

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

    yep, solved C, but wasted whole hour debugging A, turned out after contest got the wrong validation input.

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

I am getting the "presentation error" verdict, even though my output format is correct. -_-

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13 months ago, # |
← Rev. 2   Vote: I like it -27 Vote: I do not like it

again a devastating expreience this time ...!

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

    now you edit your statement. you asking help here instead of reading the question properly

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

nvm, I'm just retarded I guess

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13 months ago, # |
← Rev. 3   Vote: I like it -28 Vote: I do not like it

sad

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

YUMMY

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

Are you processing the submissions made via clarifications during contest, or do you plan to do it after the contest ends?

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    13 months ago, # ^ |
      Vote: I like it +28 Vote: I do not like it

    The way I understand the last update (12.15PT), it seems that they won't because they did reset the timer and expect you to upload your solutions normally now

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

    The announcement says they will not. Best to just submit again

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

Why is the contest ending at 10pm CEST again? It was extended by 30min and then now that extension is removed.

Edit: nvm, resolved.

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

Looks like the criteria for Round 2 is changed from getting top 5000 rank to scoring at least 10 points.

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13 months ago, # |
← Rev. 2   Vote: I like it +174 Vote: I do not like it

A request to introduce any subsequent announcements, especially contest extension, in separate orange boxes instead of changing the text in the same box. It's difficult to notice that something changes after you read the box for the first time.

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

For the last hour of the contest, I couldn't view any problems :(. I still can't. I just get a message that says "This page isn't available."

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

    You should have used a VPN.

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

      I tried that as well as clearing cache / cookies, using a different browser, and restarting my laptop. Interestingly I can view problems if I use an alternate facebook account from the same browser, so it seems like an account-level problem. Maybe I refreshed too much and got flagged as a bot xD.

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    13 months ago, # ^ |
      Vote: I like it +26 Vote: I do not like it

    I also experienced the same problem. I can view problems if I do not log in. Maybe I refreshed too much too?

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

Did they put unordered_map hack cases in C? I know it's my fault for not using vector, but there shouldn't be that much of a constant factor with unordered_map.

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

in B1 I missed that they had to be positive numbers... Any idea how the problem would've been solved if they could be negative?

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13 months ago, # |
← Rev. 2   Vote: I like it +58 Vote: I do not like it

Pretty good round overall. Congrats to the contest organizers who managed to solve the technical problems in time and save the contest from total doom.

Problems were OK. D was very standard, in my opinion: I just took some old code for segtrees with lazy updates, modified the node structure and updating function and that was it.

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

    How do you solve D without segment tree?

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

      You could apply sqrt-decomposition: store max, min values in a block and also the state of the block (flipped or not flipped). Flip all blocks that are wholly in the segment, and manually unflip blocks that are partially in a segment.

      Although it took my solution to run for over some two and a half minutes (maybe my implementation is not optimal, maybe it's the block size, my laptop or everything together).

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

      What? I literally talked about solving D with segment trees (segtrees).

      Though I guess you can do it with sqrt-decomposition, too.

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    13 months ago, # ^ |
      Vote: I like it +24 Vote: I do not like it

    I just took some old code for segtrees with lazy updates, modified the node structure and updating function and that was it.

    well that is every segment tree problem

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

In B2, it suffices to memorize all partitions' products (if the product is <= 1e9) in a map before answering the queries and just make a map lookup for complexity $$$O(45000 + Q)$$$.

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

is the intended time complexity for E something like O(NlogN (N/B) + QB), B = 1000 or something? What I did was partition the queries by k, and do sqrt decomp for each k-bucket (after doing some processing like hashing suffixes, removing short elements etc)

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

    It's possible to get rid of the log factor. For a fixed $$$k$$$, you can run Mo for the ranges while updating the number of active values under each subtree in $$$\mathcal O(1)$$$. You can additionally track the count of the frequencies themselves. Since the answer for a particular query doesn't exceed $$$\mathcal O(\sqrt n)$$$, you can answer each query in $$$\mathcal O(\sqrt n)$$$ by simply iterating over the frequencies.

    I'd still like to know if this is intended though. Took me some time to be convinced that this will run in time.

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

      i did something similar; it felt kind of cheesy, but i suppose that's part of the meta (having 6 min to run your solution vs. 1-5 seconds).

      edit: i sped up my implementation to run in ~30 seconds on my laptop (as opposed to the entire 6 min. on a server), so i am much more confident this is intended now

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    13 months ago, # ^ |
    ← Rev. 2   Vote: I like it -16 Vote: I do not like it

    I was thinking something like this: if you order them, you basically just need to find the number of LCPs between consecutive strings that are less than the given number; now for an SQRT solution, you can get that easily with Mo’s algo after precalculating LCPs between consecutive strings when ordering the whole array of strings, and using a RMQ to get LCPs for any two strings in O(1)…

    For logarithmic idk lol

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      13 months ago, # ^ |
      ← Rev. 3   Vote: I like it -8 Vote: I do not like it

      I have an idea for logarithmic: basically, after you get LCPs on the whole array, if you order the queries by the minimum LCP, what you get is basically sequences of accessible sets of indices which join with each other. What this does is reframes the question to the number of accessible sets in which the indices reside, so now you can keep a segment tree in which you keep track, for every one of those intervals, in how many sets they reside. To update this segment tree, you just replace, for every interval that contains a value x in its set, you will change it into y. To do this, you keep track of which one of the sets was smaller and turn it into the bigger one, for a small to large optimization. Now for the query, you need, for an interval l r, how many sets blah blah bla. To do this maybe we use small to large again to join the log sets into which it gets divided and it might work idk

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

I liked D very much, very happy with my sqrt-decomposition solution. Overall the problems were nice, if only there was no technical difficulties during the first hour

Also God bless whoever put a test case with 5 elfs in the samples of A

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

Can anyone tell why my solution to C1 doesn't work?

My approach was that for each query I will find which indices are flipped at the end of the whole query. For e.g if (lets's say 1 is flipped 2 times it gets nullified.) Then for all the indices which have a pending flip, I flipped all multiples of that index O(NlogN). Finally, for all values which are still s[i]=1, iterating the Boolean array from the beginning, I flip that to 0 and add 1 to my answer, also flipping the multiples of the index just flipped.

Here's my code:-

My Code
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    13 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Looks like it should work, maybe it's some memory issue? You don't initialize flip.

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

      It's globally declared boolean array initally all set to false/0.

      Also, after each test case I am resetting the changed values to false.

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

    Got accepted for me. Are you sure you were submitting for C1?

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

      That's the last thing to expect, writing a correct solution and still getting WA. T_T

      Can you share your solution? I want to verify my outputs for each test case.

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

    I got AC.

    The initial input file that I downloaded was apparently somehow manually changed by me for the last test case, and I was getting a WA bcoz of that.

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

      Same happened to me lol! So I got WA on C1 and AC on C2 lol

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

    You use ios_base::sync_with_stdio(NULL); and then immediately afterwards use the stdio command freopen. This is not supported, and your code may break in specific situations depending on the C++ standard library implementation.

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

      Can you explain a bit more, what do you mean by "not supported"?

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13 months ago, # |
  Vote: I like it +43 Vote: I do not like it

Could you please allow downloading input not only after validation is passed? (and uploading source!)
It's already really cool that input is password protected and timer starts only when you are ready!
But downloading big files takes reasonable time when internet speed is bad and I even was forced to redownload files as downloading was stuck in the middle:(
Main problem today for me was that I passed validation for D 5 minutes before contest end and then was downloading 35.4Mb archive for about 3 minutes. Fortunately it was downloaded in time and I managed to extract, run and submit in about 30 seconds
Also it will be more convenient to download all inputs in one archive!

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13 months ago, # |
  Vote: I like it +145 Vote: I do not like it

After this competition, I would like to thank Codeforces for this wonderful platform, which even in the worst circumstances and with the queue delay, works better than what I have seen today

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

Apparently, I received a corrupted file with missing lines for B2 and got WA .

My Code
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13 months ago, # |
  Vote: I like it +18 Vote: I do not like it

In addition, you will now advance to round 2 if you score any points on this round.

Yeah, cool!
I was unable to submit anything for 1.5 hours. Submitting clarifications seemed to be nonsense in this situation (as we already know, they won't review them). So I decided to abandon this contest. It seems like I should have been waiting for 30 minutes more to resubmit. What a waste of time.

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

    Submitting clarifications seemed to be nonsense in this situation (as we already know, they won't review them)

    Are you sure about that? Last year there was a similar issue as today. That time I sent my code as a clairification, which they later tested and gave me AC for the problem.

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

      I think there's only one way to interpret their announcement (at the top of any problem statement):
      We won't be reviewing clarifications sent to us prior to 12pm PT, so please resubmit to any problems you've had issues with with the remaining time.

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

        You had been explicitly instructed to submit a request for clarification if you encountered technical problems. But if you decided not to do this because it "seemed to be nonsense", then it's on you. Consider yourself lucky, because in a real emergency situation such behaviour and attitude may cost you your life.

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

          I wouldn't say a word if they actually considered these clarifications.

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

      Yes, in their last contest announcement, they said they will not be reviewing clarifications sent prior to 12 PM PT (i.e. any clarifications in the first two hours of the contest will be ignored):

      [Update (12:15pm PT)]: The system had been experiencing technical difficulties. To account for this, we have extended the contest by 30 minutes and reset timers for everyone on every problem. Your existing accepted solutions and time penalty are not affected. We won't be reviewing clarifications sent to us prior to 12pm PT, so please resubmit to any problems you've had issues with with the remaining time. In addition, you will now advance to round 2 if you score any points on this round.

      Since many people probably quit the contest in the first two hours after not being able to submit for so long, I can understand the frustration.

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

Nice problemset. Thanks to the Authors & Testers

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

After that horrific experience, I would like to thank Mike and the founders of the CodeForces website for all their efforts to help us develop our skill in problem solving.

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

GCJ before got cancelled also had some problems like this and got delayed further and further. MHC already had delayed schedule compare to last years and now this, I got a bad feeling about this. If we're lucky MHC may has its 2023 sessions complete but the 2024 sessions will likely won't happen.

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

Okay, so, you've delayed most asians' sleep by at least 2 hours, and this disaster happened, and decide to delay the sleep by another 30 minutes because the server is broken?

Yeah I do not regret skipping MHC

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

Is there something that could happen for those who requested clarification before 12 : 15 pm ,SecondThread ?

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

Any hints for problem B2? I was able to do B1 with simple recursion, and no memoization.

My Code

For B2, I've thought of calculating the prime factors of P using the sieve method. Could someone explain how to solve it?

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

    A thing to notice is that no matter what you do the final array will always have prime factors in their standard form(for B1). For Example: The Prime Factorization of 1872 is: 2 x 2 x 2 x 2 x 3 x 3 x 13 Ignoring the minimizing constraint on B1 you can just output this array and 1's to make sum = 41.

    About B2

    You can notice you can combine prime factors, by combining them you take their product and check whether the sum is still <= 41. In the above example: 1872 -> 2 * 4(2&2) * 26(13&2) * 9(3&3) So to minimize the size you can combine prime factors.

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

      Do you have an implementation of this?

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

        Check mine out

        void solve() {
  int n;
  cin >> n;

  if (n == 1) {
    cout << "41 ";
    for (int i = 0; i < 41; i++) cout << "1 ";
    cout << '\n';
    return;
  }

  vector<int> factors;
  for (int i = 2; i <= 41; i++) {
    if (n % i == 0) factors.push_back(i);
  }

  auto rec = [&](auto &self, int k, vector<int> cur = {}, int sum = 0) {
    if (k == 1) return cur;
    if (sum > 41) return vector<int>{};
    vector<int> ans;
    for (int x : factors) {
      if (k % x == 0 && sum + x <= 41) {
        cur.push_back(x);
        auto v = self(self, k / x, cur, sum + x);
        cur.pop_back();
        if (v.empty()) continue;
        int a = accumulate(v.begin(), v.end(), 0);
        while (a < 41) v.push_back(1), a++;
        if (ans.empty() || (!v.empty() && (int)v.size() < (int)ans.size())) {
          swap(ans, v);
        }
      }
    }
    return ans;
  };

  auto ans = rec(rec, n);
  if (!ans.size()) {
    cout << "-1\n";
    return;
  }
  long long sum = accumulate(ans.begin(), ans.end(), 0ll);
  cout << (int)ans.size() << ' ';
  for (int x : ans) cout << x << ' ';
  cout << '\n';
}
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    13 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    For B2 I used a dp solution to store the minimum number of factors required to make a sum m for a number n

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

Video Solutions for problems A-D!

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

This is my first time participating in the Meta Hacker Cup. I scored 21 points in round one which technically makes me eligible to participate in Round 2. However, I don't see a sign-up button. Is it just a "if you pass just come" type of situation?

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    13 months ago, # ^ |
      Vote: I like it +11 Vote: I do not like it

    They're probably still in the process of verifying submissions, checking for plagiarism, etc, and will send out confirmation of advancement soon. But you likely won't have to do any extra registration to participate in the next round.

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

      Thanks! Can't wait for the next round!!

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

The input of A I downloaded seems to be different from that used by the judge in the end, resulting in wrong answer. More precisely, the input file I downloaded during the contest has an empty line after Case 8 and does not contain Case 20.

(My source code can be found by searching my id "Brian_Hsu" on the scoreboard.)

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

On round 2 page, it is still showing top 5000 participants?

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

has registration of round 2 not opened yet?

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13 months ago, # |
  Vote: I like it +40 Vote: I do not like it

Previous comment

My solution to A seemed to fail system test due to the system problem, but they didn't rejudge it before determining who is in the top 500 place, which is a requirement to pass the bye.

If after rejudging and my solution is correct, then my score will be 68 and my penalty will be 6:49:75, which will be at around the 130-th place.

By the way, I don't know if they determine the top 500 place by penalty or not. I think that it shouldn't depend on penalty due to the system problem.

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    13 months ago, # ^ |
      Vote: I like it +43 Vote: I do not like it

    Big +1 to the second part of your comment. Given that the penalty time for this contest is obviously not an accurate reflection of contestants' ability, all contestants who applied for the bye and scored at least as many points as the 500th ranked contestant or the 50th ranked bye applicant, whichever is higher, should receive the bye.

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

      I agree with you, but this did not make a difference on who would have qualified for the bye, so all good

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

    I verified that the source code you submitted during the contest is indeed correct. We will discuss and check wether we can grant you the bye.

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      13 months ago, # ^ |
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      When can I know whether I get the bye? Thanks.

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

How many T-shirt will be provided in Round 2 ? TOP-2000 will get t-shirt in Round-2 like previous year?

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13 months ago, # |
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Well, I have solved one problem in Round 1 giving me 10 points yet it showing you are not registered for Round 2. Anyone knows why?

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

    same issue , 21 points & <=5000 (had a bad contest though) but should be able to register I guess

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

    We were checking all the submissions for plagiarism. If you qualified, you should now be registered for Round 2.

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13 months ago, # |
← Rev. 2   Vote: I like it +62 Vote: I do not like it

"What prizes can I win? We'll announce prizes soon, but you can expect familiar prizes such as T-shirts and Elite shirts, plus cash prizes for finalists."

"More prize details will be announced after Round 1."

Any new information about that? I need this to estimate whether I can win a shirt or whether I rather should go to a concert on that saturday. Priorities and so.

Edit: Update see here https://codeforces.net/blog/entry/121572

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

Here we go again. Hoping for a good round :)

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

In solidarity with the Palestinian people, and because Meta policies and practices to mute our voices ... I'm not going to participate in Round 2 and any future Meta sponsored competitions

If anyone doesn't know what I'm talking about. Please check out Twitter and see what happening in #Gaza and the West Bank.

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