I propose to give PavelKunyavskiy the official title of IOI-hero. Bravo!

OMG. ORZ.

I use gmail to login and it seems that option is not available. How can I login to do the problems?

Fire!

Awesome, great work! Thanks a lot!

It will be cool if codeforces fixes the problem with ioi style contests and subtasks become merged

Thank you so much for the hard work! I just have IOI_19 virtual yesterday via stopwatch xD and it was such a pain. You are really a live saver! orz

I have a small query, will the scoring system be based on maximum subtask points (as IOI) or maximum submission points?

Pog! Looking forward to be humiliated as a ghost participant lol

Pavel ORZ !

It will be better if you can add the links to official/unofficial editorials :) Also, there can be a comment section like we have in Codeforces Rounds so that anyone can share his/her approach.

Thanks for the archive!

Some feedback from me: I think the line spacings need a bit of improvement. In particular, I find that IOI 2021 Registers statement is a bit hard to read compared to the pdf version.

The official time limits for all IOI2021 problems were 2GB instead of 1GB. It seems that 1GB is the maximum specifiable from Polygon, but after you import the problems to Codeforces, you can manually increase the memory limit to 2GB.

Have been working a part time job and studying German language in a course for nearly 9 months next week i will finish my course can't wait to go back here i miss problem solving a lot my level is so shit i forgot nearly everything but will try hard to remember everything and get better

thank u so much Pavel

anyone else getting error when trying to start ioi 2002 day 2 virtual contest?

Is it sure that all the problems there are correct and has no problems in submitting the solution?s, for example my solution is correct but there is a problem in the test cases or time, because you will not be happy if you spent lots of time to solve the problem and getting(WA) and then it appears that there was a problem in the statement or in the judgment, or test cases .

Currently nowruz from 2017 doesnt seem to be working correctly. I submitted my outputs that got around 70 points on oj.uz and it got 100 points here.

Also since you guys added the sample in the input file, the range of the important test cases goes from 2 to 11 instead of 1 to 10 like the original, and its kind of aesthetically unpleasing and annoying to format (ofc, just a nitpick, the 100 points thing is much more important lol).

As for general feedback, i really like you guys named graders like "problem-a/b/c-grader.zip", as it was really annoying when you download graders from oj.uz and they all have the same name. I also appreciate the ability to vc those contests (even though i will probably not vc them on cf this year since there could be a error in the grader).

I would really like if it was possible to see other people's submission as SlavicG said. The upside of getting to see the way top coders implement solutions outweights a couple of clowns on the leaderboards so much (you can also just copy the solutions from oj.uz also, so there is no way to stop them to begin with).

Anyways, thanks for putting the work in.

Will IOI2022 hold an online mirror contest?

Will IOI2022 hold an online mirror contest?

Is it possible (please) to have an archive of ejoi problems on codeforces ? I know there is on oj.urz, but there are some problems missings (for example waterfront, xpart, etc.)

great Sir

Will you make it possible to view other people's solutions like on the main platform? Would be really useful since not all IOIs have solution booklets.

Will you make it possible to view other people's submissions like on the main platform? Would be really useful since not all IOIs have solution booklets.

Добрый день! Столкнулся с небольшим багом:

Задача, получив "частичное решение" все равно засчитывается как полное решение, вследствие чего последующие перепосылки, даже набравшие больший бал просто не отображаются в "Результатах". Скрины:

PavelKunyavskiy, MikeMirzayanov, исправляемо ли это, или специфика полигона?

Upd. Исправлено, спасибо огромное!

Я не могу открыть задачи :(

Вылазит страничка с "Упс! Что-то сломалось на Codeforces..."

UPD: Снова работает

Добрый вечер! PavelKunyavskiy, столкнулся с ещё одной проблемой: решение теперь выдает вердикт "частичное решение", при этом со 100 баллами: https://ioi.contest.codeforces.com/group/32KGsXgiKA/contest/103777/submission/167331311

Upd. 11.08.22 исправлено. Спасибо!

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

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

В IOI 2016, в задаче "B" есть опечатка в примере, там почему-то лишнее число 1 написано в первой строке.

There's a typo in IOI 2014 problem D: in the very last subtask, inputSeq[i] can be up to 1e9, not 1e6.

Hi,Can you add IOI practice rounds.

How does one submit to output-only problems? For example, the XOR task from IOI 2002 is output-only, but uploading a zip file fails with Field cannot contain binary data. Only some versions of C++ are shown in the language options, and there is no option for archive files.

In IOI 2011 day1 problem:garden.I'm trying to solve 1-st subtask.When I submit my code gets wrong in sample test case 2.And its halted to subtask 1.but there's no intersection in sample test and subtask 1.Can you fix this problem.I hope you will understand.

I suppose cave.h isn't uploaded IOI 13 D2 Problem Cave. The verdict is Compile error here but passes at oj.uz. Can it be checked please.

For 2005 problem E please specify that the inputs are guaranteed to be winning and that 50% of the test cases have dimensions not exceeding 25. Also for problem C I think the memory limit need to be lower (16MB) as it's intended to be done in O(1) memory.

In IOI 2018 day 2, problem F. Meetings, It seems like you automatically get 0 points if you fail any samples, even though samples 1, 3 and 4 shouldn't be included in subtask 3 ($$$H_i \le 2$$$). For example, check the diff of these submissions:

• doesn't solve all samples (0 points) vs solves all samples (36 points)
• doesn't solve all samples (0 points) vs solves all samples (60 points)

Also, in problem E: Highway Tolls, why is int64 ask(int[] w) implemented in the grader as long long ask(const std::vector<int> &w) and not as long long ask(std::vector<int> w) like it is usually done in every other IOI problem?

Добрый день, у меня случилась такая проблема , на IOI 2003 моя посылка link дает вердикт :"Решение «зависло» на тесте 1". Но когда я убрал быстрый ввод

 ios_base::sync_with_stdio(false);
 cin.tie(NULL);

у меня решение прошло на 100 баллов. Из — за чего зависит написания быстрого ввода. Вот посылка link. Можете ли объяснить.

PavelKunyavskiy

I can’t submit solutions to some problems anymore, specifically 2021 Day1 P1, and more.

When I go to the submission page, the language selection has no options. Is that the case just for me? It been like that for a week. Is it a problem with the website? Should I try to replicate the appropriate request to the server manually in the meantime?

It seems that problem Parks (2021 Day1 C) has incorrect test groups.

19-th test (shown as "group 2-4") contains test with cycle.

But subtask 4 is specifically says that "there is only one way to connect fountains" (so no cycles by definition).

Test is large, but we wrote assert $$$EdgeCount == 2 * (n - 1)$$$ — and it failed on this test:

• submission without asserts — got RE;
• submission with "return 0" on similar assert — got WA;
• submission with earlier assert about cycle — got RE instead WA (so assert about cycle triggered).

On the oj.uz same code gets 25 points instead of 5 (1 and 4 subtasks), so it seems that problem is with Codeforces test partition.

I think I found untitest for most of the submissions(official one too?) for IOI 2004 Day2 problem B Phidias.

6 8
2
4 2
2 3

EDIT: Or my coloring may be invalid.

PavelKunyavskiy IOI 2026 day 2 pls

nvm