With Nickolas not writing a contest this year, magnus.hegdahl and I have decided to take up this sacred duty :). We would like to invite everyone on Codeforces to the April Fools Day Contest 2022. Special thanks to BucketPotato for volunteering to test this contest!
The 10th April Fools Day Contest will take place on Apr/01/2022 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'll be given several weird problems and 2 hours to solve them. The contest will use ACM ICPC rules (no hacks, the standings are decided by the number of solved problems and penalty time earned on them), and it will be unrated. You can submit solutions in any language allowed by Codeforces, unless the problem says otherwise. 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.
Good luck, and have fun!
UPD: There will be 8 problems. There will be only be an interactive problem if the Collatz Conjecture is true...
UPD: Thanks to everyone who participated! I hoped you enjoyed thinking over the problemset. The editorial is available, complete with solution code and hints. Special congratulations to the winners.
| Rank | Username | Score |
|---|---|---|
| 1 | Lotus | 7 (330) |
| 2 | DeepOcean | 7 (339) |
| 3 | xyf007 | 7 (341) |
| 4 | Tyyyyyy | 7 (345) |
| 5 | Flamire | 7 (345) |
as a tester, give me contribution.
As I solved problem A, you are not.
As I oops on problem A, you are not.
man you litreally rick-rolled thousands of people
Guess there will be 'Is it rated? — 3'
upd: OK now it really appears in Problem D!!!
Change your name now.
UPDATE: The contest will be hosted on the Codeforces contest page! Everyone can register here.
Is it rated?
[deleted]
hhh
111667406
Isitrated?
[deleted]
schrodinger's boolean constant
[deleted]
I warned you guys but you downvoted!
yeah bro...
This will be my first April fool Day contest :) Really excited
There will be only be an interactive problem if the Collatz Conjecture is true.
WHAT THE HECK
It didn't say "if and only if"!
Sorry i'm not familiar with c++, can anyone tell me what this code will output?
Is it rated?Or this:
code art
don't forget to check the unusual timing
You got me!
Hallo Codeforces.I'm Tobi and this is my first April Fool's contest. And I don't know if it has a rating or not? Please give me your answer!And have a fun at the April Fool's contest.Good luck :).
it'll be my first too, "and it will be unrated."
My first unrated April Fools contest as an expert :p
if people don't get that it's a joke and start downvoting, I eat my cat
haha, this is so fun!!!! :DDDDDDDDDDDDDDDDD I cannot stop laughing :DDDDDDDDD please eat your cat
stfu furry
Looking forward to it :)
I'm a boy, it's a joke!
tonight, who can carry me?
I love WuBoLong
The Collatz Conjecture is true... )))
Imagine the contest being unrated a April fool Joke itself
Is it OK to participate in a team? It would be more enjoyable.
This will be my first April Fool Day contest. Really (EXCITED).٩ (◕‿◕｡) ۶
Announcement: This competition will be rated! just go all out!
What is Collatz Conjecture?
3n+1 problem.
There will be only be an interactive problem if the Collatz Conjecture is true...
Is there a typo or does the first be have a meaning?
There's probably a hint for the hardest problem, hidden somewhere in this sentence.
just imagine there is no contest :(
Why? It's fun!
"The contest will use ACM ICPC rules (no hacks, the standings are decided by the number of solved problems and penalty time earned on them), and it will be unrated." Is this also a joke?
Is it a rated one?
no
Is there any time penalty for wrong submission ? If answer is yes , then how much ?
20 minutes for each wrong one, I think..
contset is rated or unrated for div 2
rated for all
!yes, rated only for those who !don't participate
Where can I see the question form so I can code it?
nobody?
you must guess the problems statement
Oo :/ Thanks for responding :)
codeforce is giving wrong output on code whereas rest other compilers giving right answer
1st image is of codeforce compiler
This screenshot is of other compiler of same code(all other online compilers are also giving same output)
Here is code can you run on your compiler check 152301548
It seems today is april fool's day to fool us
Not gonna lie, you had us in the first half
Collatz Conjecture isn't true...
I proved Collatz Conjecture yesterday lol UPD: really simple thing
Why am i so minused? People tf
Okk I have been successfully made fool
DON'T CLICK THE TUTORIAL, I regretted doing that.
my internet speed is slow, so i had time to close rickroll)
I figured that E involves finding "minotaur" in the grid but no idea why it fails on test 6 :(
It's a funny round! :)
Can someone tell me why does this 152408291 fail on H it compiles both on pascal and C++
Weird, it's compiling just fine on custom invocation.
is it because of the version difference?
How on earth are you supposed to figure out that C involves finding the sum of the array?
Second word is sum in high valyrian
really? I tried this and it got nothing
I looked it up here https://wiki.dothraki.org/High_Valyrian_Vocabulary
Took me quite some time but I finally found this: https://www.valyrian-dictionary.com/
(At first I just found some weird pages and youtube videos that looked like they were promising solutions for the contest for joining some community. What kind of scam are these guys running?)
In case you're getting WA on test 3 for problem D and don't know why:
Atcoder Grand Contests apparently also have a minimum rating requirement of 1200.
Those who got AC in Problem B and Problem D were interactively running the binary search! :)
wait wtf? is it really rated?
To not keep you waiting, the ratings are updated preliminarily. In a few days, I will remove cheaters and update the ratings again!
nice joke
1 April is a very good day with very good jokes and contests)))
Sir it should have been informed prior to contest that it's rated.
Humor level to LGM.
Sir, I didnt participated in contest and my rating wasn't updated. Looks like a bug to me. Can you please fix it and update my rating?
H was pretty cool.
I just used the fact that \ can be used to continue single line comments to the next line in C++ but not in Pascal.
Did anyone come with something else?
I used the fact that const is a valid keyword in both C++ and Free Pascal. Then mixed different types of comments
(* *),/* */and//for this weird solution:I did the same thing, but for some reason my code didn't work, does anyone have an idea why?152412785
I tried to use the fact that you can start a C program with
(*a);, which looks like the start of a pascal comment.(*a);int main() {/*) begin end. {*/}This compiles with gcc, but this is NOT valid C++.
is the +179 rating i got an april fools joke? i thought it was unrated
Why it's rated?
In my opinion this April Fools contest was the funniest one than ever :) :) :)
Problem C: I converted "Pōja Verdon" from Unicode (the non-ASCII ō makes me think this problem has to do with Unicode) to binary using this service and got
01010000 101001101 01101010 01100001 00100000 01010110 01100101 01110010 01100100 01101111 01101110. Using the same service, I converted the binary to ASCII and gotP¦µ0+2¹27·.Then I thought the problem was about finding a prime that is divisible by $$$\mu_0 + 2^1 \times 27$$$ :')
and then my second attempt was to realize that $$$3979$$$ (the constraint in the problem) was tourist's highest rating (and Codeforces highest ever rating). Then I thought the problem was given $$$N$$$ ratings, find something. Then I guessed the something was to print the team rating of those $$$N$$$ ratings :')
Completely off-track :')
I also tried calculating the team rating; the first translation of the title I found was "their number", and seeing the constraints I thought that would just be a way of saying "their rating", which could mean "their team rating".
Problem B: I remembered this blog, then I web scraped the ratings of all the users and I printed the rating of the previous user in the standings :D
152344694
There will be only be an interactive problem if the Collatz Conjecture is trueThere is not any interactive problem, so Collatz Conjecture is not true
there was no "if and only if" :D
saying "There will only be an interactive problem if the Collatz Conjecture is true" is equivalent to saying "the Collatz Conjecture is not true if there are no interactive problems" because it is the original statement's contrapositive :) Contraposition
As we see, it is rated :D
Guess: at the end of the day Mike will send the "we caught you cheating" message to every participant and undo the rating changes.
Oh, yes xDDD.
1 April is a very good day with very good jokes and contests)))
Why is it rated????????????????????????????
blue again
it is not funny mikkie
You just had to solve Mikkie's sequence to remain pink. LOL.
but this task is too hart how can i solve it? i dont now anything about cf rating changes
i think , we will be back in our prev rating.
Wait till you see the rating changes today
I think is it just prank !!
We will get our older rating after some amount of time :)
So... chillleeexxx !!
Thanks for your April Fools Day's joke, Codeforces! This may be my best standing forever(the 45th). Besides, Rating changing really give me a surprises(Though I know it's a joke). This kind of problems is really interesting, I solved ABCDEH. This make me very happy. Thanks!
It is Unrated. But they increased our Rating.. Good way to fool Us lol
they decreased my rating, could have made me specialist for few mins. Not fair.
{{{(>_<)}}}
Don't do such stuff codeforces, what if someone has a weak heart.
Thanks for making me enjoy being pupil for a day or something idk
Just now I dropped 229 rating.....
What a pity,hh.On April Fool's day, we can never think of what will happen the next second
Or we can speak in chinese hhhh
Guys..it is unrated right??then why rating has been changed??
It's a joke
happy April fool day !
Rated. lol, Proved me a big fool.
prediction: the ratings will back to normal again soon.
wuhu!! Expert!!! happy!!
Is it rated or being rated is an April Fool??
What just happened !!! Surely some sort of prank
I am satisfied with my new rating so make this contest rated
as you wish, sir
Sir please sir MikeMirazayanov please give me back my rating bro sir
Next round rated for Div.1 is on April 1, 2023, see you there ;)
people who's rating decreased:-"NO WAYYYY MAN!"
people who's rating increased :-"OH YEAHHHH!"
is there a problem with codeforces now? in the contest the site is very slow and now the contest became rated and many people loss about -200 in a joke contest?MikeMirzayanov
It was an unrated contest! Now, what about the rating changes -_- ...
1/April is a good day to fuck the rate for people Say that the contest is unrated and make every one join for fun after that make the contest rated :(
изменение рейтинга останутся или завтра возвратят?
Despite the fact that the announcement states that it will be unrated, the rating for this round was still counted. Is this an April Fool's joke?
"Unrated round"
It was the first time I gave such a contest, but it was interesting and I liked it very much =D
in previous contest i have become specialist for the first time and now i have become again april fool for a day. Jaane ke jid na kro..
Can someone explain to me why this contest is rated ? Because I read that it is unrated
I think it is a prank.
Even I googled that word after it got rated
Commenting before I lose expert.
they make us april fool my making it rated .lol
А я уже поверил что раунд будет нерейтинговым, хороший первоапрельский розыгрыш
meanwhile i gained 179 lmao. its cool and all but some people lost their ratings. i hope this is an april fools joke
ya apparently it's a joke I'm just trolling :)
Oh wooooow
Mike Mirzayanov just smacked the S out of me
Thank you very much for the free points <3:
Why this contest is rated. In announcement it was written unrated. Oh, it is fixed now.
wtf missed this contest as I thought it would be unrated
I think it is a April Fool Joke that it is rated,isn't it? Our rating points didn't changed in fact,yes?
I just read the problems and solved the first problem and went to sleep! But today I found that I have lost 100 points! It is a Joke!
Very Good Contest Thank you for greating it
i'll never participate in April fools contest again.
When will the editorial be released?
It has been released. Here
I am a professional, Therefore give me contribution.
Hello a professional, Therefore give me contribution. I'm AR69420.