The contest is over; I hope you enjoyed it! The editorial is available here.
The 9th April Fools Day Contest will take place on Thursday April 1st. 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.
Good luck, and have fun!
Is it rated?
1331A - Is it rated?
Is it rated?
is it rated?
1505A - Is it rated - 2
'problem is often easier than figuring out what the actual task is' it means it will be fun without any cost/rewards. Hahaha... Interesting
Editorial can be found here.
sir it is only a song on youtube, where is the editorial??????
Read the contest name lol
Wow, what an amazingly interesting and detailed editorial! Thanks!
For problem D, how do you implement the part where it says
I'm having a bit of trouble with my code here, can anyone help?
We've known each other for so long
Your heart's been aching, but you're too shy to say it
Inside, we both know what's been going on
We know the game, and we're gonna play it
Thanks for this detailed explanation.
I couldn't solve this by myself. I guess I am just too blind to see this hidden meaning.
not funny, especially when everyone knows XcQ
Sorry but I have memorized the link lol
maybe you should hide the link under the text
it still will be visible in the lower left corner
I'm still waiting for a year when the statement for one of the tasks in April Fools day contest is just this
Given I already know one of the problem, Should I become one of the tester? :P
April Fool's Problem
I think its_Atrap
Picture became truth ...
If you practice you will become red
good luck every body!!1! i hope to reach gren
what??? i cant believe it!!1! i think you making me a trol for april 1contest
can you explain this..didnt get it.
Just observe what's written below A, B1, B2, and C.
7045, 5658 and 3987 are common years while 1964 is a leap year.
So basically that's the reason why the guy got sad.
Wasn't that obvious ?
Jai ho Guruji aapka!
Finally a rated contest XD
U got it, it's April fool
Also known as: April Rage Contest :p
submit more than five times then get the ac.....
what if at the start of the contest they say APRIL FOOL there is no contest.
How to be a good coder?? Can you tell me some way to think the solution for a problem? I don't know where to start or what to think first!
You can start now by solving your first problem 1428H - Rotary Laser Lock
Why do you hurt him in this way
will this contest be helpful for placements
this is the placement -.-
All questions asked in Today's contest will be repeated in placement test.Hurry up!Remember All questions.If u missed even single testcase You will not going to get 1cr.
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This actually got me! XD
How Many Problems will be there and problem ratings?
500 if you crack the fool's logic otherwise 2500.
not conduct the contest and tell everyone that we fool u guys :)
Can we think that the fact this round will be unrated is also April's fools day's joke? :)
would you even believe today if I tell you something real?? Brave browser which is an open source web browser is now acquired DuckDuckGo which is a search engine mainly focuses on privacy of user.
Let me know if you think I am making you fool.. because you may be fool if you think I am making you fool. LOL
Wait is today April 1st? I thought today is March 32nd
Your brain wanted to fool you
What if, it turns out, they were fooling us about the contest' start time and we all got fooled :v
What if, it turns out, they were fooling us about the contest being unrated and we all got fooled ¯_(ツ)_/¯
Kinda sad that this blog post be getting more upvotes than 3 educational round announcements combined
How the hell is tourist first even in this contest XD. I can't even get past the 2nd problem. I even searched if there's a thing such as digital millennium calculation act in desperation.
Am I April fooled by the server almost not working for me 30 minutes?
IS IT RATED? IS IT RATED? IS IT RATED?
This contest made me realize that besides being dumb, I am also a brick.
No worry, the Standings will be inverted!
SecondThread solved B after 37 incorrect submissions.
Sounds like me solving a task after reading the editorial.
B example: input: 54817 ans: 7 5 + 4 + 8 + 1 + 7 = 25; 2 + 5 = 7; So the ans is 7 :)
Me googling about roots (B-DMCA)
The biggest problem to solve I was to wait for custom invocation to run something :(
Can anyone explain D and/or F?
F is just braille, hefty link(s) to decode https://en.wikipedia.org/wiki/Braille_pattern_dots-12 and change last numbers to get a new character
Now I realize the second line, but couldn't know how to solve the first line...
( I solved it, see like https://en.wikipedia.org/wiki/Braille_pattern_dots-23 https://en.wikipedia.org/wiki/Braille_pattern_dots-45 and so on. ) thx.
D: Express $$$N$$$ in base $$$M$$$. Answer is YES if all digits are pairwise distinct.
F was $$$2-x^2$$$. I solved it from reading second line in braille, ignoring the two invalid characters and then adding the power so that it works on the example test case.
Nice contest. Too bad the custom invocation for the secret language doesn't return anything most of the time. Was H a program for Z80 processor? I solved it just by looking at hexdump, not sure if that was intended.
There is an editorial already: https://codeforces.com/blog/entry/89260
I wonder how exactly did you solve it from the hexdump? Did you just see numbers that looks like ASCII codes and just decided to sum them up pairwise?
what is the secret language?
The Seriously programming language (later renamed to Actually; also, it seems that the version on the server is outdated, as several commands didn't work there).
Seriously, how to get better at doing April Fools Day Contest?
It is a rare experience to find that you get passed for a problem that the god did not...
Could anyone tell me the idea of C?
s[i] — 'A' == (s[i — 1] — 'A' + s[i — 2] — 'A') % 26
Check s[i] == (s[i — 1] + s[i — 2]) % 26 for every i >= 2. Don't forget to subtract 65 from every letter. (65 is 'A' in ASCII) Code
you have to take alphabets as number i.e. A=1,B=2,...
As written Fibonacci suggests that the previous two char's addition should give the current char
if string follows such pattern then YES else NO ( if length of string<=2 then print YES )
if any two characters addition exceeds 26 i.e. U+V=20+21=41 then take modulo with 26 i.e. (U+V)%26=15
My solution : 111691458
For F, I was googling "How to write brainfuck in brainfuck ? "
Lol, I actually tried submitting brainfuck in english, because it was giving some different answer on custom innovation with Secret Programming Language
Can someone tell me how they decoded the braille in F? I spent an hour but couldn't find any good online converter.
same here I tried opening it in editor ended up with some weird characters
Using the sheet should be enough for solving the problem
You just have to find the symbols carefully.
How to solve B?
Find digital root of given number
(1505G - Encoded message is about Braille too)
why answer in B is (x — 1) % 9 + 1?
here is answer https://math.stackexchange.com/questions/2102877/explanation-of-digital-root-sum-formula/2102907
Fancy contest! But that feeling when i see editorial of problem D,
but you know how it is when you're trying to remember a fancy-sounding word and come up with all kinds of similar-looking ones?
Problem I :
Unlike the past years, this time any code you submit in ``Secret 2021'' language will run successfully — or at least produce no recognizable error.
fuck yougives RTE and tells you the name of the language.