AlperenT's blog

April Fools Day Contest 2024
By AlperenT, 8 months ago, In English

Hello, April Fools lovers Codeforces!

We, AlperenT, flamestorm, ToxicPie9, and willy108, would like to invite everyone on Codeforces to April Fools Day Contest 2024! The 12th April Fools Day Contest will take place on Apr/01/2024 17:35 (Moscow time). This is a joke competition in which solving the problem is often easier than figuring out what the actual task is.

In this round, you will be given $$$n$$$ cool bugaboos where $$$-1 \le n \le \textbf{[REDACTED]}$$$ and 2 hours to solve them. The contest will use extended ICPC rules (no hacks, the standings are decided by the number of solved problems and penalty time earned on them). You can submit solutions in any language allowed by Codeforces, unless the problem says otherwise.

Please note that the round is unrated and that the penalty for a wrong submission is 10 minutes.

To get an idea of what the contest will look like, you can check out the contests of the past years: 2012, 2013, 2014, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023. (It has been 12 years since the first April Fools Day Contest, thank you Nickolas!)

Please do not send any clarification requests in the contest, as we definitely will not be sending funny responses like we did last year.

Good luck, and have fun!

UPD: Editorial is released!

UPD: Congrats to the winners:

  1. tiger2005
  2. emthrm
  3. Enchom
  4. arvindf232
  5. KumaTachiRen

And the first solves on each problem:

  • Vote: I like it
  • +822
  • Vote: I do not like it

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

Is it rated?

→ Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it -33 Vote: I do not like it

    It's mentioned in the post that the contest is unrated.

    → Reply
    • »
      »
      »
      8 months ago, # ^ |
        Vote: I like it +65 Vote: I do not like it

      It is mentioned in the post that's why he is asking.

      1st April Rules

      1.Do not trust anything anyone says

      2.Do not trust the first rule

      → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it -34 Vote: I do not like it

    It's mentioned in the post that the contest is rated.

    → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it +41 Vote: I do not like it

    Is it rated?

    → Reply
    • »
      »
      »
      8 months ago, # ^ |
        Vote: I like it -50 Vote: I do not like it

      Well, if these kind of crap questions are asked in April fools, then I would prefer to pass.

      → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it -16 Vote: I do not like it

    Yes..... except that the rating goes to a different destination.

    → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    i always see you to send the fisrt comments. it's fast!

    → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    no

    → Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Man those problems are tough tho

→ Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Yes, but this is that time of the year when we peasants have the chance to beat these GMs and LGMs.

    → Reply
»
8 months ago, # |
  Vote: I like it +5 Vote: I do not like it

Do you love April Fools?

Yes:

Definitely:

Absolutely:

Without a doubt:

Of course:

→ Reply
»
8 months ago, # |
  Vote: I like it +8 Vote: I do not like it

Good luck!

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

My first unrated contest <3

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Codeforces April Fools lovers!

→ Reply
»
8 months ago, # |
  Vote: I like it +8 Vote: I do not like it

Imagine the contest was the april fool

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

me when i see flamestorm hii flamestorm

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

MAY THE POSITIVE DELTA BE WITH US

→ Reply
»
8 months ago, # |
  Vote: I like it +53 Vote: I do not like it

As a problem setter, JNybraNfNW. This will be useful in the contest with probability $$$\frac{33}{66}$$$.

→ Reply
»
8 months ago, # |
  Vote: I like it +3 Vote: I do not like it

I'm gonna take a screenshot of the blog to be safe in the contest

→ Reply
»
8 months ago, # |
  Vote: I like it -25 Vote: I do not like it

Can we hack questions?

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Why no April fools in 2015

→ Reply
»
8 months ago, # |
  Vote: I like it -73 Vote: I do not like it

Downvote me please

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

As a tester, I recommend you to participate in this contest

→ Reply
»
8 months ago, # |
  Vote: I like it +8 Vote: I do not like it

will it be rated but with contribution?????????š

→ Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    petition to make this an actual thing

    → Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I hope for this to be my last rated april fools day contest

→ Reply
»
8 months ago, # |
  Vote: I like it +8 Vote: I do not like it

Is REDACTED 142024?

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Finally unrated for me)

→ Reply
»
8 months ago, # |
  Vote: I like it +1 Vote: I do not like it

at the end when it's time to begin the contest you will say we make you fool there is no contest today.

→ Reply
»
8 months ago, # |
← Rev. 2   Vote: I like it -36 Vote: I do not like it

After contest

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

orz

→ Reply
»
8 months ago, # |
  Vote: I like it -15 Vote: I do not like it

I want to prank my friends on April Fool. Comment down your suggestion

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

ngl I love the April Fools rounds more than the general cf rounds!

→ Reply
»
8 months ago, # |
  Vote: I like it -30 Vote: I do not like it

Codeforces Sucks Its Actually ####

→ Reply
»
8 months ago, # |
  Vote: I like it +14 Vote: I do not like it

sounds sus, is it actually !!unrated :skull: ?

→ Reply
»
8 months ago, # |
← Rev. 2   Vote: I like it -41 Vote: I do not like it

→ Reply
»
8 months ago, # |
  Vote: I like it -25 Vote: I do not like it

Goodluck and have fun everybody!

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

The best pranks u get on April Fools are the problems from this contest :)

→ Reply
»
8 months ago, # |
← Rev. 2   Vote: I like it +10 Vote: I do not like it

https://codeforces.me/contest/1812/problem/J -:]

Spoiler
→ Reply
»
8 months ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

Is it rated?

→ Reply
»
8 months ago, # |
  Vote: I like it +18 Vote: I do not like it

As a tester, at most √n of the problems will be interactive.

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

good luck

→ Reply
»
8 months ago, # |
  Vote: I like it -9 Vote: I do not like it

Problemset leaking: http://surl.li/scemq

→ Reply
»
8 months ago, # |
← Rev. 4   Vote: I like it +9 Vote: I do not like it

April Fools contest 2023:

Completely REAL factorization of F
Completely FAKE factorization of F (100% wrong)
→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Imagine that, there is no problem as given.

→ Reply
»
8 months ago, # |
  Vote: I like it +10 Vote: I do not like it

Have fun :>

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

as a tree i want to have children

am I a tree ?

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

The round can be rated!!!!

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I'm new to this April fool contests but i saw 2023 one and i'm very confused! Can somebody give me a brief summary about what's this contest about!

→ Reply
  • »
    »
    8 months ago, # ^ |
    ← Rev. 4   Vote: I like it +9 Vote: I do not like it

    The problem statements are delibrately removed. You must figure them out by yourself.

    - April Fools Contest

    → Reply
    • »
      »
      »
      8 months ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      And it isn't rated right? i know it says Unrated in bold but it has happened before that they made it rated even after announcing "unrated" right?

      → Reply
      • »
        »
        »
        »
        8 months ago, # ^ |
        ← Rev. 2   Vote: I like it 0 Vote: I do not like it

        Just check if anyone participated in previous April Fools contests and gets rated =)

        → Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Is it rated :"3

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Why can't it play as a team? After all, I think it's more fun as a team.

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Please don't say you guys were joking making it rated after contest ends (T_T)

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

imagine every bold written words are their opposite

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

April Fool problems always harder than normal problems

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Is it rated ?

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Imagine calling unrated is a fooling material, in real this contest is rated :3

→ Reply
»
8 months ago, # |
← Rev. 2   Vote: I like it -11 Vote: I do not like it

Guys here is the problemset that I’m found:

Here it is
→ Reply
»
8 months ago, # |
  Vote: I like it +12 Vote: I do not like it

What if at the start of the contest they say APRIL FOOL there is no contest.

→ Reply
»
8 months ago, # |
  Vote: I like it -6 Vote: I do not like it

Upvote me please With ease If u dont have disease Or dis ease Else i’ll cease ✌️ peace

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

How hard will be this contest? Is this contest like Div2 or more hard? You guys have any idea?

→ Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    It'll be of a different kind, as they said in the post, you can see the past editions of the contest to get an idea of the kind of problems

    → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    The observing parts are quite hard but there are a few easier problems. The implementation is extremely easy though.

    → Reply
    • »
      »
      »
      8 months ago, # ^ |
        Vote: I like it +1 Vote: I do not like it

      The implementation is extremely easy though.

      You can try to write the shortest code if you want a challenge :)

      → Reply
»
8 months ago, # |
  Vote: I like it -9 Vote: I do not like it

Is it a rated?

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Unrated? Is it a joke or not?

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

Hoping to become specialist this round!

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Honey, I love you.

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

me going cm this contest lesssgo

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

AYO MAN I LOVE GLAMOC DAWG I HAVE BBEEN BANNED FROM EMC NEXT DESTINATION BAN: CODEFORCES SOON->

LONG LIVE GLAMOC

i hate ni

→ Reply
»
8 months ago, # |
← Rev. 2   Vote: I like it -21 Vote: I do not like it

It was my first time attending April fool cf, and hopefully it will be my last time too. Bye!

→ Reply
»
8 months ago, # |
  Vote: I like it -20 Vote: I do not like it

Please upvote me once, i don't want a -ve contribution on my profile: Plzz

"Coding like poetry should be short and concise".

April Fool Joke for You:

Why did the tomato turn red? . . . . . . Because it saw the salad dressing!

→ Reply
»
8 months ago, # |
  Vote: I like it -11 Vote: I do not like it

The first and possibly the last time in my life that I have defeated tourist

→ Reply
»
8 months ago, # |
  Vote: I like it -6 Vote: I do not like it

I need editorial for this problem Are You a Procrastinator? if it exist after the contest...

you guys are successful in making April fool of me with every damn problem

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

What I think about F:

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

i want @umnik screencast for this contest with musikk

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

WTF 0 solves in $$$D$$$ for 100 mnts , then suddenly near 1k solves within a few mnts !! what the hell is happening!!!

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

    Exactly!

    → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    just you have to print YES in the end of the contest

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

      I tried to submit this in the last 5 seconds and I got "you have already sent this code" message. I think I did better job in procrastinating than everyone who got AC

      → Reply
    • »
      »
      »
      8 months ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      Oh shit !! I tried figuring out connection between PHP and procrastination when I saw first submissions were in PHP

      → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    ?!

    → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it +7 Vote: I do not like it

    problem was called procrastination. so u couldn't get AC until the end of the contest

    → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    problem changes cause we are Procrastinators !

    → Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    the moment they changed the statement, everyone crashed in it :3

    → Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

The contest was nice.

→ Reply
»
8 months ago, # |
  Vote: I like it +3 Vote: I do not like it

They Have Really Fooled us T_T.

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

it has to be rated;

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Problem F is really unfriendly to those without a phone. XD

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Man problem D was insane. I was the 14th solver for this problem

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

hardest pset ever :)

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Imagine getting WA on C with 5s left in the contest because you put an extra value in your array by mistake T_T.

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

This contest really fooled me Dozens of WA! :/

→ Reply
»
8 months ago, # |
  Vote: I like it +9 Vote: I do not like it

I spent way too long on D thinking the easter egg and "no" and "yes" and "lie" and "procrastinate" meant anything... :(

→ Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Me too. And you can try "never gonna give you up" :)

    → Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I am a procastinator

→ Reply
»
8 months ago, # |
  Vote: I like it +24 Vote: I do not like it

I spent all the time thinking number 12 in Problem C meant the 12 months of a year.

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

    I was on the same path but I realized there are 13 different inputs

    → Reply
    • »
      »
      »
      8 months ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      When i realized that i thought in the zodiac signs, cause there are 13 signs with ophiuchus. I know it makes no sense xd.

      → Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

just awesome and fun

→ Reply
»
8 months ago, # |
← Rev. 2   Vote: I like it -15 Vote: I do not like it
hardest contest ever
→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I'm excited to read the editorial.

→ Reply
»
8 months ago, # |
← Rev. 2   Vote: I like it +50 Vote: I do not like it

The best April Fool Contest I've ever been participated in. Nice job!

→ Reply
»
8 months ago, # |
← Rev. 3   Vote: I like it +27 Vote: I do not like it

OK I found this awa Happy April Fools Day!

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

problem J is so funny!! lmao when I was solving it

→ Reply
»
8 months ago, # |
  Vote: I like it +5 Vote: I do not like it

April fool contest really made me fool

→ Reply
»
8 months ago, # |
  Vote: I like it +23 Vote: I do not like it

rainboy started the contest from the front. Thanks to April Fool.

→ Reply
»
8 months ago, # |
  Vote: I like it +5 Vote: I do not like it

Again an awesome problemset from the same team. Thanks for fooling me!

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

Procrastination

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

What a fool i am i understand after giving the contest!

→ Reply
»
8 months 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.

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

fun contest

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

this was fun

→ Reply
»
8 months ago, # |
  Vote: I like it +20 Vote: I do not like it

How many tried to find a 01-QRcode decoder like me. I thought the QR Code was the code for 12, but I didn't try to scan it because I don't know a fast way to turn it into a scannable QR code.

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

When will be the rating updated? Is it rated?

→ Reply
  • »
    »
    8 months ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    I have a bad news for you....

    Spoiler
    → Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Which Unc wrote problem J

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Instead of being online nonstop you could already sent mail

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

This contest really make me fool

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Chin Chan Chon mann

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Yes I know and that's is why I'm coming but I need to come first this is the base case

→ Reply
»
8 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Hey Alparent, your back side is white!! XDD

→ Reply
»
7 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Why should April Fool's Day competitions be rated?

→ Reply