flamestorm's blog

By flamestorm, 3 weeks ago, In English

Thank you for participating in our contest! We hope you enjoyed it.

Please let us know what you thought of the problems by voting!

1952A - Are You a Robot, Again?

Idea: flamestorm

Hint
Solution
Feedback

1952B - Is it stated?

Idea: willy108

Hint
Solution
Feedback

1952C - They Have Fooled

Idea: AlperenT

Hint 1
Hint 2
Hint 3
Solution
Feedback

1952D - Are You a Procrastinator?

Idea: AlperenT

Hint 1
Hint 2
Hint 3
Solution
Feedback

1952E - Sweep Line

Idea: AlperenT

Hint 1
Hint 2
Hint 3
Hint 4
Hint 5
Hint 6
Solution
Feedback

1952F - Grid

Idea: flamestorm

Hint 1
Hint 2
Solution
Feedback

1952G - Mathematician Takeover

Idea: flamestorm

Hint 1
Hint 2
Solution
Feedback

1952H - Palindrome

Idea: ToxicPie9

Hint 1
Hint 2
Solution
Feedback

1952I - Dark Matter

Idea: ToxicPie9

Hint
Solution
Feedback

1952J - Help, what does it mean to be "Based"

Idea: ToxicPie9

Solution
Feedback
  • Vote: I like it
  • +182
  • Vote: I do not like it

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

Fast editorial

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

    it's prewritten, so it can be fast. and also, it's really goofy so it needs to stay simple enough for people to understand -> fast editorial

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

      buoi dit lon dai chim ia bu dung betele cac lon buoi t se cat cai buoi dit lon dai chim ia bu dung betele cac lon buoi cua m buoi dit lon dai chim ia bu dung betele cac lon buoi dit lon dai chim ia bu dung betele cac lon buoi

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        2 weeks ago, # ^ |
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        oh hey hi there friend

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        42 hours ago, # ^ |
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        top 10

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

Thank you codeforces. I procastinated until the end to submit "YES" in D, but you told me I already did submit such a source code.

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

    Thank you codeforces, too. I procastinated until the end to submit "YES" in D, but you told me I already did submit such a source code. (repeat) print("YES")#reeeeepeat

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

    True, in fact, in problem A I wanted to output "NO" then "YES" but gave up the idea after incorrect submission and later on didn't try that for D, LOL

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

    if you have submitted it before the last 15 minutes then you are not a true procrastinators :33

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

      False. I once got the output:

      wrong answer "Procrastinator"? Procrastinator: Someone who keeps delaying things that must be done.

      And I was wasting my time with the wrong problem, instead of any other. So I think I still fit the parameters ;)

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

    yeah same problem

    Just change the lower/upper casing

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

    well you can just change a bit

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

Wonderful F!

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

Man problem D was insane. Cannot even cry

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

i printed "print safety"??

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

Based editorial uwu

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

ce dracu e cacatu asta

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

What words trigger funny checker responses in D? I managed to get "no", "yes", "lie", "procrastinate", any string containing both "no" and "yes", and the easter egg.

Also, F is nearly impossible without a phone...

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

    no

    yes

    hello world

    heaven

    hell

    Procrastinator

    believe me

    i found all of these it is likely that there is more

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

      I tried "believe" and the checker mentioned not lying, does "believe me" do anything more?

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        3 weeks ago, # ^ |
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        'me' is not related sorry

        be'lie've just trigger because lie

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

      "?" and "please" too

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      3 weeks ago, # ^ |
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      < gives 'i am too lazy to read that character'

      love gives love uwu

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

    I printed "!" (without quote) and got this:
    "Your response is too short. I cannot bother replying if you do not respect me enough."
    254588860

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

      Any 1 character message gives this response.

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

    ChatGPT

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

    bruh i literally used only websites in laptop for F lmao

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

    "definitely" is recognized as yes

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

bruh D and J are GOATed fr dude

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

Great contest, F was a really smart idea.

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

Problem D T_T I thought i will be the first one to submit xD, but got fooled

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

    I used some insane logics like using sleep to wait 1 second before submitting YES but got absolutely fooled in the end. My entire contest spent on D.

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      3 weeks ago, # ^ |
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      oh damn! haha mine as well plus dark matter

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3 weeks ago, # |
Rev. 3   Vote: I like it -29 Vote: I do not like it

I did G using this solution idea 109323691.

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

Thanks for the fun contest! Had a lot of time being trolled (and talking on the "questions about problems" part too) :)

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

    Also whoever came up with the jnybranfnw osnxymbjws rvfqjqrfgp zcaziobjzu rymhtsgare ckkjqfhfrb xfbntvovfq easter egg thing is a genius

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

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

    saying please also says why are u begging, if u say anything religious: god, devil, heaven, hell, also gives u funny answers

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

How will we get that QR by just watching the input in F, that is amazing but how can we do that?

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

    just hide the number "1"

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

    I went to paint and started drawing squares on top of one's hoping that one's cut total board in 12 pieces but i noticed qr-code pattern Doing by hands was inconsistent and too long so i searched for online convertor from binary to QR and find this site https://bahamas10.github.io/binary-to-qrcode/

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

    You can fill in the color against the excel sheet and then scan it with your phone. XD

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

    I thought the task was to submit a QR decoder and managed to adapt some QR reader repo (that works on images) to be Codeforces-submittable and work on binary matrices: https://github.com/dpaleka/qr-reader-matrix. Of course, this would WA, because it doesn't produce "12" but "max 4x4 sum", lol.

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

    You can replace 0 with " " and 1 with "█"

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

      That was my idea of using the terminal to do it. Of course the image needs to be resized to a square, but it should work.

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

    I had copied the text into Excel,divide it to a 21x21 square,set all the “1” with black background. I always think that Excel is a best friend with codeforcers

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

    I used turtle module in Python and drew dots of every 1. Then I could easily scan that QR code.

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

    Try Ctrl+F and type 1.

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

6666

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

Isn't log normally base 10 in math? and ln is used for base e

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

Thanks for fast editorial

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

What does "you have skill issue on speed smh" means in J?

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

bro how the hell should someone be able to understand i and e

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    3 weeks ago, # ^ |
      Vote: I like it +89 Vote: I do not like it

    How to solve E:

    • Ragequit the contest
    • Play Minesweeper
    • "omg, now I get why $$$1$$$ is blue and $$$2$$$ is green"
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      3 weeks ago, # ^ |
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      broo :skull: :joy:

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      2 weeks ago, # ^ |
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      My dark mode Codeforces extension made all the numbers white :( (though I didn't participate)

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

Dark Matter really sucks me !!

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

dude you are sick on the QR thing !

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3 weeks ago, # |
  Vote: I like it +63 Vote: I do not like it

I lost it :DDDD

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

Those who solve these type of questions are the real problem solvers. Literally no meaning. But still how on earth you guys solve it ?

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

Problem A Totally APRIL FOOLED Me!!!!

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

cringe problems, cringe authors, i hope the next time the problems will be better

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

that dark matter meme >>>>>>>

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

I enjoyed solving the C problem, thanks for the contest.

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

Still did not understand the Line Sweeper with the answer in front of me. Were are the mines supposed to be placed? On a line over the array? On the array?

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

    If the hypothetical placements were a $$$0/1$$$ array $$$b$$$, then the input array $$$a$$$ is just $$$a_i = b_{i-1}+b_{i+1}$$$.

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

1952F — Grid Can Never think about this... Great question!!

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3 weeks ago, # |
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AlperenT is the coolest!

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

What does this use to? (If you look at the pdf closely)

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    3 weeks ago, # ^ |
      Vote: I like it +10 Vote: I do not like it

    That means (almost) the same as megabytes. Kibibyte = 2^10 bytes = 1024 bytes, mebibyte = 2^20 = 1024*1024 bytes = 1024 kibibytes. However, in most cases binary prefixes (kibi, mebi, gibi...) are more correct, because standart SI prefixes, which are commonly used, mean another numbers (kilo- = 10^3, mega- = 10^6, giga = 10^9...)

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    3 weeks ago, # ^ |
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    I also noticed that, moreover, in the Russian version it says 'megabytes', so I thought this mismatch could mean something

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

I think Code C-- count previous year question from 2012 — 2023

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

Really become fool, after seeing the editorial of F !!

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

In D, I printed JNybraNfNW which led me to the easter egg osnxymbjws. Then i printed osnxymbjws which led me to rvfqjqrfgp and asking to give up. Then i printed rvfqjqrfgp which led me to zcaziobjzu and asking me to leave suggesting that all these incorrect submissions causing me Penalty. Then i printed zcaziobjzu which led me to rymhtsgare saying that Fine, this is what you are looking for. Then i printed rymhtsgare which led me to ckkjqfhfrb saying that I have been Fooled. Then i printed ckkjqfhfrb which led me to xfbntvovfq. Finally i printed xfbntvovfq which again sent me to jnybranfnw forming a cycle.

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    3 weeks ago, # ^ |
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    no way someone got fooled like me :OOO i did see the "this will be useful with probability 33/66" thing and totally gave up because of the loop lmao

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    3 weeks ago, # ^ |
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    wtf

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

    How did you even find the first one?

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

    dang whoever added that easter egg that mustve had a lot of time on their hands and wasted it all

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

It was so painful to write on assembly without labels.

Will submission be opened, because I would like check my solution to problem J.

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

    Ok, I can submit. What does wrong answer this ain't it chief... print something mean?

    Upd. Ough, I accidentally jumped here to the second line.

    yeet a[k]
    go touch some grass
    
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3 weeks ago, # |
  Vote: I like it +10 Vote: I do not like it

106 submissions on C be like: $$$>: ($$$

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

I even tried to prove I'm a procrastinator by pushing the code to the time limit:(

That code ran for 998ms(just about to TLE), I thought it was procrastnate enough:)

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

Nice Problem I.Hide and Seek

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

Sad thing was that I used some free online service to remove the (funny! I have recently mentioned it in a conversation) meme from the dark matter pdf, and there wasn't anything visible behind it, so I decided that that wasn't it.

Thank you for the contest though! It was unexpectedly nice

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

Thanks for this amazing contest. Because of this contest I have finally became specialist, tough luck for people who got negative delta because they weren't able to figure the solutions out.

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

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3 weeks ago, # |
  Vote: I like it +41 Vote: I do not like it
Never give up
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3 weeks ago, # |
Rev. 2   Vote: I like it +13 Vote: I do not like it

The first contest on CodeForces in which nobody can get AK with 0 penalty theoretically.

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

problem D was insane.

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So, sleep is harmful?

wrong answer "sleep"? The cousin of death.
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3 weeks ago, # |
  Vote: I like it +10 Vote: I do not like it

See Number of submissions for 1952C — They Have Fooled of Enchom .... 3rd in today's contest ....

71....

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

    All I knew was there are few inputs and outputs seem small :)

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

WHAT AN I PROBLEM !!

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

For question D, assume you do not submit within the last fifteen minutes:

If the string you submit contains affirmative words, such as 'yes', 'sure', you will receive the reply: I have no reason to believe you.

If the string you submit contains negative words, such as 'no', 'never', you will receive the reply: Diagnosis: Skill issue.

If the string you submit contains both affirmative and negative words, you will receive the reply: So you are both a procrastinator and not? I do not believe you.

If the string you submit contains numbers or symbols, you will receive the reply: I am too lazy to learn how to read that character.

If the string you submit contains 'lie', you will receive the reply: I never lie.

If the string you submit is not a keyword, you will receive the reply: I am yet to download enough RAM. Give me short and concise responses that I can understand.

If the string you submit is too short, you will receive the reply: Your response is too short. I cannot bother replying if you do not respect me enough.

If the string you submit is too long, you will receive the reply: Your response is too long. I am too lazy to read all that.

It is important to note that only the first line of the string is checked; other lines of the string are not checked.

This content was derived from an hour of work and dozens of submissions.Crying...

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

I wanna see J checker

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

Ah man, problem i was too trivial. I almost had it.

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

image

BucketPotato gonna simp you next April Fools contest.

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

J is the best! I laughed throughout the whole solving process

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

Question for C

Since "The problem asks for the problem count of the April Fools Day Contest that was n years ago." why in the 1st example for input 0, so for the current year the answer is 10, if it's 12th contest.

Similar for the 2nd example, 1 year ago was 11th contest.

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    3 weeks ago, # ^ |
      Vote: I like it +10 Vote: I do not like it

    that was n years ago

    Read this part again but slowly

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      3 weeks ago, # ^ |
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      aah, thanks! For some reason I kept thinking it's about the number of times the competition had been held in history until this year.

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

problem I:

256 mebibytes

And me:

string toBinary(int num);
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3 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

Hey guys, do you know what makes a person drunk after alcohol? A contest whose designer drank alcohol!!! It was wonderful, one of the best contest of my life

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

the bot roasted me:

it said: wrong answer "no?" diagnosis: skill issue :((

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

Man, I couldn't solve A because I was only looking for the green lights. Then I tried to take all pictures except for the ones with red lights or where the red arrow on traffic lights points to. Also, I was trying to get the answer counter-clockwise because there was a roundabout sign. After all that, I gave up and gave the picture to Microsoft AI

I submitted 'safety' without even knowing why, just because an AI told me to. So yeah I'm apparently a robot :D

Also, I was sure that the problem name suggests my solution is intentional, and I wondered why so many people had already AC on it.

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

I think the contest should be rated!! Of course, only for legendary grandmasters After seeing our questions, I said: Hey, tourist, where are you? Do you think you can still contest and complete?

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

Wonderful C

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

Bruh do the numbers in E actually mean the number of mines in the tiles around it not including itself? I thought it included the tile itself and I got stuck trying to make sense of the samples lmaooo 😂😂🔥🔥 should've realized why the numbers do not exceed 2 instead of 3.

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

    I think I got this thought process because I was trying to solve it as if the grid consists of 2 lines, with the first line being array a and the second line being filled with unopened tiles.

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

I didn't understand the problem C. Can anyone explain the problem, please?

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

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3 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it
Video Editorial
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3 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

problem f is so hard to think for me skill issue

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3 weeks ago, # |
  Vote: I like it +10 Vote: I do not like it
Was problem D based?
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3 weeks ago, # |
  Vote: I like it +4 Vote: I do not like it

Ok so I tryied more the 10 phareses in problem D and I leave the contest 18 minutes before ending

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

I'm curious about response if one print "No" early. Who tried this, and what feedback did you get?

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

    I assume you mean "Yes". I printed it and got

    "Yes?" I have no reason to believe you.

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

      I know the response of "Yes". I mean exactly "No".

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

        Oh. I printed Yes No once (actually, in hindsight, I don't know why I did that but whatever), but never only "No".

        EDIT: A person above submitted it, you can check what they got.

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

        I tried it. It was -> wrong answer "No"? Diagnosis: Skill issue.

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

original weed fr

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

wtf man hahahhah wtf

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

Mentioning the address of the earth within outer space in the header of problem [I] sounds pretty logical. ONLY aliens can solve it!

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3 weeks ago, # |
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Why we can't see the code from other's submissions?

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3 weeks ago, # |
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I just noticed, the mine in problem C is written in bold, foreshadowing the minesweeper problem, amazing

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

Based editorial and vibe check problems ratio editorial.

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3 weeks ago, # |
  Vote: I like it -7 Vote: I do not like it
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3 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

Thank you for fast editorial

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

The checker in problem D said "wrong answer "let me Ac"? No."

:0

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

It's my first time to engage april 1st contest, and what hell of F! I spend lots of time on finding the length/area of 12 in the image and was i be fooled?

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

I can't believe so many submissions for prob F. How to generate the qr with that data

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3 weeks ago, # |
Rev. 2   Vote: I like it +8 Vote: I do not like it

It seems that the codes of other contestants are not yet visible.

If visible, the numbers in the first column should be blue instead of black.

Does anyone else have a similar situation to me? Am I the only one who can't browse other contestants' codes? How to solve this problem? Thanks!

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

    They haven't opened the submissions for viewing yet.

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

    They should be visible to the public now

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

The checker of J has been published

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

I submitted after the contest ended LOL (Problem D)

image

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

Why didn't anyone solve D for like 1 hour?

Seems simple enough.

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

    A real procrastinator should solve it in last 15 mins, I solved it in last 50 seconds. One of the best procrastinators out there!

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

I think that if G add the 1 0 testcase then it could have more ACs.

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

Dark matter meme ☠