Ciao, Codeforces! We're glad to invite you to take part in Codeforces Round 975 (Div. 1) and Codeforces Round 975 (Div. 2), which will start on Sep/27/2024 16:35 (Moscow time). You will be given 6 problems and 2 hours and 30 minutes to solve them in both divisions. Some problems will be divided into subtasks.
UPD: the time has been changed to Sep/27/2024 16:35 (Moscow time), which is different from the time announced before. Please note the unusual starting time.
This round is based on Italian Olympiad in Informatics (OII) 2024.
The problems were authored by lorenzoferrari, wksni and me.
We would like to thank
- KAN for his nutella coordination;
- bortoz, collodel, dp_1, franfill, franv, harniver, jamesbamber, Kaey, veluca93, Virv for helping with both this contest and the onsite contest preparation;
- bortoz for pictures in the statements;
- Flamire for VIP testing;
- Um_nik, EgorUlin, konsteros, Mihail_Podyachih, bugrova, Ludissey, Nonoze, Sofapuden, Temmie, jeroenodb for testing;
- MikeMirzayanov for creating Codeforces and Polygon.
Score distribution:
- Div. 1: $$$500 - 750 - 1000 - 1500 - (2250 + 750) - (1500 + 1500 + 1500)$$$
- Div. 2: $$$500 - 1000 - 1750 - 2000 - 2250 - 3000$$$
We hope you'll like the problemset!
As the first commenter.. thanks for the div1 contest.
but you are pupil, so how is div1 relevant?
please downvote. wow -91. Thanks downvoters. I beat you attractors in your own game
update: please more downvotes i hope it becomes -100.
That's ok, but I love div1 contest, I'm a 6 stars in codechef and I just started contest in CF. Besides, it's fun to watch the tourist and LGMs play. Thanks.
you'll watch me too, haha! can I raise my rating in div1 contest?
I'll watch you, sir, but in div2. That would be fun too.
so, you mean I can raise my rating in div2 contest as a newbie?
Sure. As a dev tutor.
I have another question. my contribution is -5. why?
CUZ you comment all day.
thx for your kindness. I want to become friend with you. give me your social link like discord or telegram.
do i wake up at 1 am to do this?
There's no option, bro. isn't it div1..
The starting time is (on purpose) similar to that of the onsite contest.
Well, you kind of forget that there does exist a certain part of the globe where they always had to wake up at 12 AM to take contests
Hopefully in the future we will have more contests for different time zones.
Now , you don't have to
I'm sure this round will be cool !
This is an odd timing tho, anyways this will be my first contest
Same here! Good luck.
same to you
no offense or anything but i never understand your round editorials so please focus on them being good this time
edit : also include proofs most recent rounds i feel like we get the solution thrown at us with no proof or anything attached last round problem D is an example
Cool, another round I won't be able to attend
ㅤ
1am?
is it possible to reschedule it to 20:05 utc+5.5 on friday, if then please do it. otherwise no problem,I will have to do it virtual, because in daytime i will be in my office for friday, or you can make it saturday the same time. It's not a problem to miss contests for unavoidable reasons but if possible, I don't want to miss it.
People who use AI, why are you doing this? Besides the fact that it is forbidden, it also kills all the interest of the competition. What is the interest of such submission if in the end they will not give anything in terms of experience, and the account will still be banned.
Why do you have to bring up this topic? AI users will not stop using AI after reading your comment.
that is 11 in the morning for me ._.
I hope the time will be changed to 22:35(UTC+8:00) as usual.
Great time for me. Hope for more.
I think tourist will drop out of Tourist in this contest
No he won't, the contest happens on World Tourism Day
I want to know if I can participate div.1 with the score as low as me and if I can only participate div.2 or I can participate both.
You can participate in only div2 and not div1, I think for div1 lower bound is 1900
okay, thank you for your explanation .
1:35 pm for me it will be great I am gonna skip college class that day
You can skip your college class, but for me in our country ,the contest will begin at night and it will finish until most people has been slept. So I should increase my CF score by staying up late.
finally, a contest at a good time for Americans
what an amazing time for Americans
Is the score distribution for Div1 and Div2 correct ? Since when did Div2 C become 1750 rated ? I think there's been a typo ?
so what does that mean if its set at 1750 ?
Generally Div2 C's have points of 1250-1500. More points mean the problem is likely to be more challenging.
It means it will be a speedforces round with 10k+ submissions on B and <4k on C.
why the unusual starting time ?
please downvote
read the post carefully, everything is written there. This round is based on the Italian Olympiad in Computer Science (OII) 2024.
ok thanks
Unfortunately, I have school at this time :(
Weirdest way to skip a Div1: possibly coinciding with team meeting at work...
cool time in general, but not in friday XD
oh shit. i thought it is Saturday. that means missing last 10 minutes or so ?
No need, the time got changed
he really has the last name "ferrari", impossible.
it actually is the third most common surname in Italy! :)
As a tester, I hope no one will be using AI instruments (^˵◕ω◕˵^)
My reaction when I open at 17:35 to enter the contest:
As a tester, I wish all of you a good luck!
Div1 is too few. More plz :)
You are right.
Why use Ciao instead of Ciallo(✿◡‿◡)?
Div 2c 1750??? Something is cooking...
The starting time means i probably can't participate but good luck to others!!
Oh no, it’s 16:05 in China. I am in school that time, bad luck to miss a div1 again.
Serve you right.
As a tester, I'm so happy to be able to say that!
my strategy: stare problem C for 30min if ! solvable goto bed
I'd participate if it was 6 hours or a day later. This is a big F you to students and working Americans and Europeans.
Aren't the ratings for the rounds swapped?
Read this blog
swap div1 with div2
Div. 1 and Div. 2 use different problemsets, so comparing their scores doesn't mean anything.
Waiting a month for a div1 only to get a 4am round :(
isnt the scoring distribution for div 1 usually higher
Not necessarily, and there is no reason why it has to have higher scores, as Div. 2 and Div. 1 are completely separated.
Wow, this is a very suitable match time for our Chinese compatriots, and I am looking forward to having a good performance ：)
I love U ❤️. There is a love story between us ❤️.
I love the words
Now I will give div-1 or div-2? Div- 1 looks more scorable than div-2. And div-1 rated range?
Expert and below can participate only in Div. 2. Div. 1 is for Candidate Master and above.
point values are not representative of absolute difficulties, only the relative difficulties (sometimes they too might be wrong because authors mispredicted)
it seems that d2C = d1A in this round, you want to get C as first problem?
Didn't know about this.
very interesting distribution for div1.....maybe consider increasing time?
Why Flamire is the $$$\text{V}\color{red}{\text{IP}}$$$ tester but le0n isn't?/kel
$$$\text{L}\color{red}{\text{GM}}$$$ ? (bruh he's not even tester)
Nonono.. bro, $$$\color{black}{\textsf{l}}\color{red}{\textsf{e0n}}$$$ is going to be LGM very soon.
Because he didn't test.
Because I didn't test.
Every time i open CF, the score distribution changes.
UPD — They changing time now as well.
Why was the start time of the contest changed?This is not very friendly to me in China.
This is very friendly to me in China.
What was the original time in China?
Thank you for adjusting the time
Sorry for changing the starting time. I've just known that there is a OII contestant who participates online. With the previous starting time, he could access Codeforces and the submissions before the end of the official OII round.
I see.And thanks to reply.
I see, no problem. Lucky for me now, as new starting time ensured I would have finished my workday before joining... XD
i think you should make a note on the blog that the time changed, i noticed it only because of a comment, and im sure a lot of people don't go scrolling through comments
I think there is no need to do another post for it as the contest is postponed,not preponed!
A div1 after such a long time, but on a weekday afternoon, Have to wait for the next one now :((
Oh its changed, my bad, orz
jeroenodb is so orz
Why
hope it will not have any interactive problem :)
I think so too!!!
21:35 UTC+8, great time for me! Really looking forward to this round! Good luck and have fun! :)
Now the contest is during school, but I will still do it!
The rare daytime div2 in China has disappeared …
Has the time been changed? What was the original time?
About 4:35 ......
D=F1<E1<F1+F2=E1+E2<F1+F2+F3
I have to say that strategy can play a huge part in this contest for IGM/LGM participants...
my CM self will be lucky to get ABC.
Looking at the gap between B-C in div 2. I have to mentally ready for hard problem this time.
Why did you move the contest to 16:35 utc+3?
See here.
thank you for moving the time!
oink i'm e_x_cited for this.
Hope to reach CM :D
Christ is King
its fine for 1 contest but please dont set this unusual time for future contests too, i barely reach home at that time :(.
My local time is 21:35 (UTC+8), which is within my acceptable range. Can you tell me what time it is there?
Hi
english or spanish
Is it safe to assume its a typo that the div 1 score distribution is easier than the div 2?
As a tester, I tested.
Ugh have to skip this due to change in time. My sleep cycle forces me to sleep at 5-6 these days. Atb everyone