Good luck to everyone, there's no FSTs in this contest!

yo guys, can you help me back to positive contribution?

hope this is the last div.3 i officially participate in

I just want +ve delta 🥲

edit: why am i getting downvoted???

Hello, I participate for the first time in a competition , I didn't even know codeforces existed before today and I look forward to compete. Thanks, good luck to all.

There will officialy be Silksong news 5 minutes before the round. That'll either give me the boost straight for specialist, or make me want to kill myself. Let's hope it's the former.

I am looking forward to this game very much

I hope it'll be good contest for everyone and I'll get a huge + delta.

I will compete for being expert, I hope I do well and enjoy this round.

Hoping to leave pupil this time

Clashes with Silksong special announcement

：）

Vladosiya, cry, Proof_by_QED here?

I have to participate!

Finally , CF is back to ruin my day again :)

Finally , CF is back to ruin my day again :)

What a great contest!! Thanks to authours!!

Wishing high ratings to everyone!!

19k solves in B? CF is cooked.

MathForces

Was hard as Div2

C2 was tough, but such an amazing problem!

How did it went guys?

For me since I am a newbie I wasted all the time on 1st two problems.

digitforces

How to solve D?

Can anyone please explain the approach??

Very very great contest! Just a little bit harder than its name

Also I was ranked 800 until 25 minutes before the end and now I see I'm 1900! How is that possible?

so bad contest as Div3 contest. i show that it was should be rated as Div2.

nice problems, felt very similar to previous div 3s only, didnt try D and C2 but got the logic and will upsolve

I don’t like pD It’s so annoying

Guys!! I have attended in a math olympiad for the first time in my life. Thanks for the Contest !!

F and G are entirely cobbled together by forcing multiple different templates. It's really extremely boring to set such questions.

I got negative delta on this contest because while doing one of the problems, I saw a picture of the newly revealed mega victreebel (pic below) and could not properly debug my code while laughing for 45 minutes.

d is way too standard and solvable with the following 2 links with very little modification

https://www.geeksforgeeks.org/competitive-programming/cses-solutions-digit-queries/

https://stackoverflow.com/questions/73821319/number-of-occurrences-of-digit-in-numbers-from-0-to-n

Something like digit DP seems to be too complicate for a problem D. Do you have any simple solution?

My god, problem $$$D$$$ is implementation hell. I got the idea quickly of binary search and we can use Digit DP to find sum of digits of numbers in a range, but was not able to complete the implementation in time :(

problem D is awful

I'm trying to solve D and going as far as:

• got the k when n is 10**x
• got the digit sum when n is 10**x
• with k what is the current digit

But to figured what is the exact sum with k is some number is still doesn't quite there yet, can someone teach me how to approach similar problem more efficiently?

div3 or div2 + div 3?

div3 or div2 + div3?

Cheers to ChatGPT!!

Does anyone know more problems like D (ignoring cses)

C1 was easier than B. C2 was a really good problem.

I think most of the downvotes on this blog are because of the math heavy problems from B to D.

YAY

MY PRAYER HAS BEEEEN A/C

Almost every newbie, pupil, specialist of top 100-200 have one or more than one AI code. Why CF are not banning them, why only skip their solution. If a person cheat this time, and you only skip his solution, next time he will make sure that his code looks like more human written.

And I do not understand the mindset of these Indian college students. Every where I see most of them are Indian engineering students. Bro, you might get a job by cheating, but you won't survive in the culture. Every day companies are laying off people, you might get one job easily by cheating, but for other job you will struggle a lot. Even some companies are moving to in-person interviews because of cheating. Stop doing cheating, and start studying.

Why are the ranks shown in friend and common standings different ?

Dudes were too lazy to make a contest, so they just gave us a math exam instead.

In C1

vector <long long> cost;
    long long c = 3;
    long long cnt = 1;
    for (int i = 0; i < 21; ++i) {
        cost.push_back(c);
        c = 3 * c + cnt;
        cnt *= 3;
    }

why this code is calculating the cost for each 3^x correctly? The formula was 3^(x+1) + x * 3^(x-1) but we aren't using this. For more please see editorial.

How does the standing system work? It shows that my official common standing is 3372 yet in the contest section in my profile, my rank is displayed to be 4517.

Dear Codeforces Team,

I am writing to respond to the notice about my solution (ID: 334878052) being similar to others. I want to clearly say that I did not cheat and did not share my code with anyone.

I created the solution by myself. I first thought through the main ideas on paper and made sure they were correct before writing any code. For testing, I used an online compiler (GeeksforGeeks compiler and some time other online IDE also), which I have done before in past contests. Now I understand that using such websites might make my code visible to others, which could explain the similarities. I feel really sorry about this mistake.

I want to make it clear that I never meant to break the rules. From now on, I will only use my local computer for writing and testing code to avoid any such issues in the future.

I apologize if this situation has worried anyone, and I hope you can consider my explanation. I care a lot about the fairness of competitive programming and the Codeforces community. I am committed to following the rules and maintaining the standards of this platform.

Respectfully, abhi00100 2132E - Соревнование по арифметике Codeforces Round 519 by Botan Investments

Got a TLE on the 4th problem with only 7 minutes left. Replaced a nested while loop with an O(1) arithmetic trick and got #Accepted just 3 minutes before the final whistle. Siuuu... #Codeforces