Why the task C is appeared on the Div1 contest?

Thanks for the contest!

I especially liked how div1D allowed (encouraged?) this way of solving: pretend that $$$x$$$ can only be up to, say, $$$m = 100$$$, brute force the first move, then try all possible hidden $$$x$$$ and choose the one that maximizes the total loss (it's not hard to see what to do after the first move more or less optimally, in particular how to spend about the theoretically minimal loss in the second move and achieve 0 loss in all upcoming rounds), print the optimal first move and generalize for $$$m = 10^4$$$. This way you don't get to experience this beautiful underlying construction, but it's a reliable strategy of using the computer that I don't see very often

btw the author is cheater

Do u really think getting bronze medal from KHIMO is an honor ? (newbie / pupil can get a bronze from that olympiad)

also if anyone's interested in what KHIMO is, here's the the link to the website :)

what proof you want, just read the top comment of this blog, you just keep asking to prove things which already proven

As a tester, I highly recommend this problemset and BTW

Sniping Cheaters — Episode 2

Well well well, it seems Mr. Cheater Accuser PiggyPump is a cheater himself...

First, let's look at the obviously cheating (and disabled) account PumpyPig. What might his motives be?

levitational

Please take it to the DMs. Cheating allegations can go to the appropriate channels. You can contact a CF admin if you have credible evidence. One would expect a blog to contribute positively, not some 10 message slapfight that improves nobody's day

cheater means a person owning account has cheated at least once in his life on a platform, if it's long then it's left cheating, also even if you not cheater you are liar, that's even worse, so the fact that you stopped cheating because you were forced to doesn't make things any better. Thus you are cheater, but you don't even know it

if u are saying just "prove it" it proves that you dont have any exuces. and u want to be get proved yeah? just install any cf cheater flagger extension and look at your profile.

why so ????

make the vector a have like 2 quadrillion numbers which would overflow n being an int

no YOU are everything that's wrong with our society

Observe that in one move the robot can move modulo 3 +1. And now imagine all diagonals to be of 3 colors Red, Green and Blue. Reds = the ones with (r+c)%3 == 0 Green = (r+c)%3 == 1 Blue = (r+c)%3 == 2

Now in these 3 families the robot will ALWAYS move in the pattern (say we started at index with mod 0) R -> G -> B -> R -> G ....

So we basically want to match the rhythm But one critical thing to also observe is that we have to start top down (top right to bottom left) because observe that lets say robot is at a Red diagonal and we are lasering the diagonal which is the next (whose r + c is just greater than this) Red, then it is guaranteed that if our rhythms are matching then we will collide no matter what because in the next step it will go Green (if it decides top move up) and we will also go Green (moving down) and boom collision. If robot moves down then we will corner it eventually.

As a person who hates reading long stories thank you.

1294F is 2k btw

I hobe nadeem qualifies to SCP next year.

Found this contest easier compared to normal Div2. I don’t know why

Zindagi means life, right? I think I heard it in Persian

how does your submissions justify that you are not a cheater? an unofficial website that everybody uses that people trust more than your source obviously carries more weight and can determine public opinion.

macaquedev also won't show any evidence as stated here, what we know is that you either cheated in any form of: Plagiarism and External Assistance, Code Obfuscation, Multi-Account Abuse for hacks and other purposes, or any use of an LLM stated here. If you didn't cheat then appeal to the CF Cheater Database to remove the flag.

1. They don't just add whoever is reported, the cheater database have a high trust rate, thus is the most objective proof of a cheater.
2. if you don't care about the website that majority of people uses to judge, use your brain to think how else are you going to prove them wrong.
3. whether you cheat or not i dont rly care that much, i don't even see why macaquedev would care about grey cheaters tbh. btw just continue ruining your reputation and continue "cheat"-ing and contribute your rating to everyone in this zero-sum rating game bc

imagine responding subjective sentences with "lie" lol. also sir, there is something called online trolling, i have lost enough braincells talking with you i just troll you. can you not process that every single point in my last comment is subjective. i know you contacted macaquedev and got ignored so badly you gave up lol. ah and yes i can now differentiate you with SwastikPandey_cheater now you showed me how much less $$$IQ$$$ you have compared to him. do you have any proof of me reporting false positives? if not why are you making wild accusations lol. if you are asking how did it become trusted, well because its deserved to be trusted, ofc you will never ever gain that level of trust by the community bc.

Bruh you brick div2cs and make gpt alt accounts talking about some "philosophy" I can assure you the downvotes you get isnt the cheater (you) deep state trying to silence you

Woah, what is this “Wegmans Food Markets” company? I think I will check it out as a result of their sponsorship of this competition.

nahh

Hope roll back comes and you get 1397 -> 1399!

Bruh I don't care that 50 reds and a few chatgpt pro owners are getting cool tshirts I just want my +delta

there is modern trends now. men just get no respect. bob deserve justice!

you can search linearly on K as well because k is of order sqrt n

fr

I do not say he is CHEATER, but still suspicious, because I did not see he is cheating with my eyes. Let's listen to others.

I heard that if you use your full umamusume powers to mysteriously AK a contest in 20 minutes you get a secret rank called "disabled" which is lower than gray

I know u're cheater but i can't prove it yet...

good blog...commenting for reach

efishel please upload the editorial ;)

Sooner or later, it will be 'Alice' if Alice wins and 'Almost Alice' if Alice loses, making sure Alice's name appears no matter what.

Great contest!

aura

as tester and former participant, pilliamw puts a lot of effort into making these problems, therefore you should participate

Yes Jon, you are absolutely right!!

1399 factorial? dang big rollback

Insane ragebait attempts

Bro, authors cant make Div. 3 just by "snap". Its hard work, with 3-4 steps, like making original ideas, preparing everything on legendary site polygon.codeforces.com and testing. Preparation often takes 2-3 months minimum.

No, Codeforge is available to anyone who is interested and wants to use its features, regardless of their location.

But it's only for students and not for professionals? The site and the account creation heavily suggest so: You can only create an account as a student or parent, and as a student you are required to select a grade from 5-12. Is parent the "right" option in that case?

Hey hey! Feel free to put grade 12 if you graduate / are a professional. It is the simplest option for now. We will address account types in the future.

i was very sad that leo/need split, but this made my day

sound so serious lol, but i do agree with u

Planned post contest discussion stream here

PumpyPig Noobteric

Oh yeah you use deepseek instead mb

PHSCO MENTIONED !!!

It's over

The Scoreboard Watching is really real. I was someone like that, but I managed to change. It feels less like a competition and more like a challenge now.

When you participate in a contest, don't look at others much. Focus on yourself and do your best.

I think people those are mentioned in this blog post are downvoting me because reality hits harder than anything

makes sense to just disband and conduct from scratch like how we conduct jee, damn at this point icpc is becoming more like neet, only pending thing is some insider faculty not leaking the set to their college team, and I am pretty sure at this rate , it will come to pass too , congrats India

he probably used $$$AI$$$ for more than just the blog

Now there is a need for justice for JonKhan, instead of Bob

No, I am his classfellow and I can assure you JonKhan never used AI during a codeforces round.

He is from a reputable school in the Pakistani CP community and has performed well in on-site contests. JonKhan made it to final round of TST last year and has given medal level performances in many invigilated OI online mirrors.

Codeforces hates Bob

whether or not he cheated, I don't know, and really it's never been more pointless to discuss specific cf cheaters. but it is admirable that you are sticking up for your friend.

im not alleging him of cheating.

this blog was important because he is impersonating to be me to abuse others, so i js awared others through a blog that i and him are different persons.

he have 3 banned ids and he created more to use my identity to abuse others. shouldnt others know about it? so they stop tagging me for his doings!

after you learn how to code in C++, you do not want to write code in python again.

You're right.

Hail Bob

with that short of a window and your current rating graph:

method: claude

hours: however long the contest is

resources: https://claude.ai

Honestly, the changes in your code style across submissions and the very short time between them do look suspicious. It really gives the impression that LLMs might have been used. Better to solve problems independently instead of relying on LLMs during contests.

And another red flag :skull Bro was solving 3 problems in Div 2. Then in Div 3, suddenly started solving all the way up to F? What happened, bro drank Red Bull and grew wings? HOWWWW ;)

And looking at these submissions too, they honestly give off LLM-generated vibes lol. :skull

The diagonal modulus by 3 increases by 1 after every operation.

Nice problems!

Also is it me or getting rating now is getting much harder than before. Like I remember when 1000 or 2000 in Div 2 used to give + in expert or just look at my graph.

How shameless do you have to be? You wrote a terrible post about a useless topic, used AI to generate it, and then had the audacity to upvote it with your own alt accounts.

yt ads spoiling the thing :(

I used that sort of strategy to solve div1B: do BFS over the states (masks of which diagonals the thing can be in) for low N and hope the pattern works out for higher N.

we are so doomed sadly

You orz

nifeshe can you add H1 and H2 pls, i guess Axial has already rested

Good luck to you too my friend. I hope i reach specialist in this contest!

12 hours study usaco 8 hours codeforces 3 hours sleep 1 hours eating and other

wow! thx for the tool!

I hope I can manage to do the contest, since I have a guitar lesson :(. I’ve already missed classes for the course because I was doing another contest. Good luck, everyone.

Auto comment: topic has been translated by Humseletor (original revision, translated revision, compare)

Man it was rude. And it's not really a valid point, because cheating on A won't give you any advantage, as cheating on problems that only a dozen people can solve. What you say in other words is that any form of cheating is equally bad. I am not saying that I did the right thing and that it should be forgiven as if nothing happened . I just want a just trial or at least an explanation

Vietnamese fly without wings

Ok you still are wrong. Saying "I probably used AI more than I should" implies that you can use it for small things which is wrong. You shouldn't be using AI for input or output parsing either. And with this mindset how could they not give you a permanent ban. You're probably just gonna start using AI for small things, and slowly go back to your cheating ways.

ohh god js stop at this point, literally YOUR EVERY SINGLE COMMENT is on this

yok be kotu bisi yapmadin djsjndndne sadece beklenmedikti

iyi bile yaptin, unutmustum burayi

cheater

Managing to fraud your way to IGM is insane, LLM development seems so terrifying now...

mambo

Auto comment: topic has been updated by Golden_Eagle07 (previous revision, new revision, compare).

can be easily optimized to O(N) just store count in cnt array then find first i with cnt[i] < k

Its allowed by rules to use AI for input output parsing https://codeforces.me/blog/entry/133941 . Its even allowed to use autocompletion. If you ask my opinion they should forbid both input/output and autocomplete as well. Actually autocomplete is almost as capable as prompt-> answer way.

Auto comment: topic has been translated by Samat2016 (original revision, translated revision, compare)

oh oopsy

deleted

Auto comment: topic has been updated by efishel (previous revision, new revision, compare).

You've just said that you were using AI during the contest, people like you are poisoning cp community, you don't get an explanation as it would give cheaters hints on what to avoid when they are trying to bypass the anticheat. If you don't want to compete in a fair environment, and don't want to use your brain there are other activities on the internet for you.

internet explorer

no, swastik_p isnt cheater, and other was last seen 1.5y ago

As a participant, I hope my result in the competition earns me good points.