Автор Harbour.Space, история, 9 лет назад, По-английски

Hello, Codeforces!

The First International Data Analysis Olympiad (IDAO) Began Online This January — Finals To Be Held This April in Moscow, Russia.

This is the best time to join the competition. It will be running until February 11th and the problems will be in English — if you want to take part and win a prize, register now.

Higher School of Economics, Yandex and Sberbank along with Harbour.Space University are proud to announce an olympiad created by and for data analysts.

The event aims to bridge the gap between the all-increasing complexity of Machine Learning models and performance bottlenecks of the industry. The participants will strive not only to maximize the quality of their predictions, but also to devise resource-efficient algorithms.

This will be a team machine learning competition, divided into two stages:

  • The first stage will be online, open to all participants.
  • The second stage will be the offline on-site finals, in which the top 30 performing teams from the online round will compete at the Yandex office in Moscow.

We would like to thank the IDAO team for their amazing work in problemsetting — Dmitry Vetrov, Andrey Chertok, GlebsHP, Alexander Guschin, Michael, Konstantin Mertsalov, Evgeny Sokolov, Vadim Strijov, Nick Tiden, Dmitry Ulyanov, Andrey Ustyuzhanin.

More information and register

STAGE 1. ONLINE

There will be two separate tracks during the online stage. From the machine learning perspective, the tracks will be similar, yet the restrictions put on the solutions are different for each track.

We hope that the two tracks will make the olympiad fascinating for both machine learning competition experts and competitive programming masters, Kaggle winners and ACM champions, as well as everyone eager to solve real world problems with Data. Moreover, we encourage people with different backgrounds, ML and ACM, to team up and push Data Analysis to new frontiers.

The first track will be a traditional data science competition. Having a labeled training data set, participants will be asked to make a prediction for the test data and submit their predictions to the leaderboard. In this track, participants can produce arbitrarily complex models. If you like to use 4-level stacking or deep neural networks, this is the right track for you – you will only need to submit test predictions. However, those who qualify for the finals will be asked to submit the full code of the solution for validation by the judges.

In real world problems, efficiency is as important as quality. Complex and resource-intensive solutions will not fit the strict time and space restrictions often imposed by an application. That is why in the second competition track, your task will be to solve the same problem as was in track one, but with tight restrictions on the time and on the memory used during both learning and inference. You will need to upload the end-to-end code for your solution: both learning and inference. The evaluation server will run training and testing for your model and report the result. Both learning and evaluation must fit into time and memory constraints. If you like the most efficient solutions, this is the right track for you.

PRIZES

Winners of the first stage will be invited to Moscow to take part in the on-site competition. Accommodation, and half-board meals are covered by the organising committee.

All participants have the chance to showcase their skills to the data science community on an international scale — the results will be internships, networking with some of the most passionate and like minded individuals, and job opportunities.

For winners, valuable prizes will be awarded, with both Higher School of Economics and Harbour.Space University offering special awards. Students from outside of Russia will have an opportunity to join a Master's degree programme at HSE, within the Faculty of Computer Science, free of charge. From Harbour.Space University, a 29,000 EUR scholarship will be offered, which also covers living costs in Barcelona, for graduate and undergraduate degrees.

Special prizes might be awarded at the discretion of the jury.

The winners will be determined by the leaderboard ranking based on private test set.

More information and register

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Автор PrinceOfPersia, история, 9 лет назад, По-английски

I'm honored to announce that Codeforces round #459 is going to take place on January 29th and Reyna and I are the problemsetters of this round.

I'd like to thank keyvankhademi, AlexFetisov, winger, Belonogov, cyand1317 and demon1999, AnPelec for testing, KAN for coordinating the round and MikeMirzayanov for the great Codeforces and Polygon platforms.

The main characters of the round are Stranger Things characters.

The scoring distribution will be announced soon.

Good luck and have fun.

UPD0: The round is over, we hope you enjoyed it. Editorial will be posted soon.

UPD1: System testing is over, congratulations to the winners.

Div.1 winners are:

  1. EvenImage
  2. FizzyDavid
  3. ainta
  4. aid
  5. Swistakk

And Div.2 winners are:

  1. Omar_Morsi
  2. Chaarzeh (Interesting :-?)
  3. magicalCycloidea
  4. Tanzir5
  5. UoA_Kanade

The editorial will be posted in a bit.

UPD2: Here's the editorial. Also please help me and Reyna do better next time by filling out this form.

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Автор MikeMirzayanov, история, 9 лет назад, По-русски

Добрый день!

Прямо сейчас идет первый тур олимпиады. Посылаю участникам лучи интеллекта и внимательности! Надеюсь, и задачи и результаты вас порадуют.

Предлагаю в комментариях обсудить задачи (когда тур завершится во всех регионах) и результаты.

Наверное, в этом году большинство регионов проводит на Яндекс.Контесте. Интересно, многие ли регионы проводят самостоятельно?

Желаю всё решить, успеть оттестировать и получить максимальные баллы!

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Автор Luqman, история, 9 лет назад, По-английски

I think it's good time for collecting teams that are going to WF this year. Let's complete the table together :)

Europe

Count Country Region University Member 1 Member 2 Member 3
1 Belarus NEERC Belarusian State University 244mhq Mediocrity vilcheuski
2 Estonia NEERC University of Tartu oml1111 SLLN .I.
3 Kazakhstan NEERC Kazakh-British Technical University Zharaskhan Aeon NurlashKO
4 Russia NEERC Moscow Aviation Institute mingaleg rembocoder i.trofimow
5 Russia NEERC Moscow Institute of Physics & Technology Golovanov399 Kostroma -imc-
6 Russia NEERC Moscow State University LHiC V--o_o--V vintage_Vlad_Makeev
7 Russia NEERC National Research University Higher School of Economics iskhakovt kraskevich Kronecker
8 Russia NEERC Novosibirsk State University pvs viktorov Romchela
9 Russia NEERC Perm State University mimirrow Alexandr_TS Sert
10 Russia NEERC Saratov State University BledDest adedalic Roms
11 Russia NEERC St. Petersburg Academic University kreker afedor cdkrot
12 Russia NEERC St. Petersburg ITMO University Belonogov SpyCheese izban
13 Russia NEERC St. Petersburg State University el_sanchez Kaban-5 --Pavel--
14 Russia NEERC Ural Federal University kb. Tinsane sivukhin
15 Latvia NEERC University of Latvia how_to_become_purple Instasamka JustN
16 Lithuania NEERC Vilnius University jDomantas JustasK Darius0021
17 Czech Republic CERC Charles University in Prague -Wave- f.bialas RiHL
18 Poland CERC Jagiellonian University in Krakow Vladyslav zielmicha farqd
19 Poland CERC University of Warsaw Radewoosh Errichto mareksom
20 Finland NWERC University of Helsinki mango_lassi kllp Hansuzu
21 Netherlands NWERC Utrecht University ? ? ?
22 Norway NWERC University of Bergen ? ? ?
23 United Kingdom NWERC University of Cambridge dd__ MeinKraft zDule98
24 United Kingdom NWERC University of Oxford Andrei1998 tamionv george_stelian
25 France SWERC École Normale Supérieure de Paris Rafbill Akulen Nore
26 Italy SWERC Scuola Normale Superiore dario2994 Delfad0r fram
27 Switzerland SWERC ETH Zürich dacin21 simonm DeinFreund
28 Bulgaria SEERC Sofia University iddilov daninnm Anton_Chernev
29 Romania SEERC University of Bucharest alex.velea bicsi AndreiNet
30 Turkey SEERC TOBB University of Economics and Technology kalimm muratakburak OnurYildiz
31 Ukraine SEERC Lviv National University Andrew_Makar philologist pro100leo
32 Ukraine SEERC Taras Shevchenko National University of Kyiv AllCatsAreBeautiful Kirill.Mikhailov yevhenii44
33 Ukraine SEERC Uzhgorod National University MrDindows Melnyk Rubanenko

.

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Автор DimaPhil, история, 9 лет назад, По-русски

Всем привет!

В это воскресенье, 21 января, мы начинаем сезон личных интернет-олимпиад — в 16:00 по московскому времени состоится первая личная интернет-олимпиада для школьников, которая также будет являться первым отборочным туром ИОИП. Вам предстоит помочь подросткам, попавшим в игру Джуманджи, со всеми возникшими у них трудностями.

Продолжительность олимпиады — 5 часов. Не забудьте зарегистрироваться на цикл личных интернет-олимпиад в этом сезоне перед началом олимпиады, если вы не сделали этого раньше.

Условия появятся на сайте в момент начала олимпиады. Сдавать задачи можно в PCMS2 Web Client.

Олимпиаду для вас подготовили подготовили Илья Збань (izban), Николай Будин (budalnik), Александра Дроздова (demon1999), Михаил Анопренко (manoprenko), Дмитрий Филиппов (DimaPhil) и Григорий Шовкопляс (GShark).

Также спасибо Ильдару Гайнуллину (300iq) за помощь в тестировании задач.

Удачи!

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Автор Superty, история, 9 лет назад, По-английски

Hello Codeforces!

I would like to invite you to CodeCraft-18, which will take place on Saturday, 20th January, 9:05 PM IST. This is a combined Div. 1 + Div. 2 round and is rated for participants of both divisions.

CodeCraft-18 is part of Felicity, IIIT Hyderabad's most awaited set of events, Threads. With a plethora of intellectually engaging online contests in various fields of programming, mathematics and general knowledge, Threads is a celebration of the spirit of computing and engineering. Other than CodeCraft, we have the Project Euler-style contest Gordian Knot and a jeopardy-style CTF event called Break In, amongst other events.

I would like to thank the CodeCraft team -- FundamentalEq, RohanRTiwari, additya1998, aman_shahi2, born2rule, codelegend, crvineeth97, deepanshugarg, devanshg27, mprocks, nir123 and virus_1010 -- for their amazing work in problemsetting. I would also like to thank vintage_Vlad_Makeev for helping us prepare the problems, and MikeMirzayanov for the great Codeforces and Polygon platforms.

Prizes

  • Top 20 participants win Codeforces T-shirts
  • Top 5 participants from India win Codeforces T-shirts

You will be given 8 problems and 3 hours to solve them. The scoring distribution will be announced later. Good luck!

Update: Scoring is 500 — 1000 — 1500 — 2000 — 2500 — 3000 — 3500 — 3750

Update 2: We would like to apologize about problem F and G, which turned out to be easier than we expected, and about the mistake in the statement of H.

Congrats to the winners!

Top 20:
1. SkyDec
2. Syloviaely
3. matthew99
4. dotorya
5. FizzyDavid
6. laofudasuanbaofushehui
7. ikatanic
8. jcvb
9. Um_nik
10. molamola.
11. rajat1603
12. geniucos
13. MrDindows
14. Radewoosh
15. --Pavel--
16. shanquan2
17. 613
18. JOHNKRAM
19. mxh1999
20. satyaki3794

Top 5 in India:
1. rajat1603
2. satyaki3794
3. jtnydv25
4. akulsareen
5. akashdeep

The editorial is ready!

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Автор TooNewbie, 9 лет назад, По-английски

Hello Codeforces! Some months ago I wrote tutorial about basics of recurrent sequences. This blog, my second tutorial is about mine another favorite topic — Invariants and Monovariants. These are useful concepts which will help you solving problems, especially, constructive ones. Even if you are not familiar with this topics, I'm sure that you solved problems with use of invariants and monovariants without knowing it, continue reading, you will understand my point :) There will be hard problems which are based on old IMO problems, so I will try my best to explain solutions of examples.

So, what are Invariants and Monovariants? An invariant is a quantity that doesn't change. A monovariant is a quantity that changes monotically (that is, non-decreasing or non-increasing). Seems simple, yes?

Let's start with a few easy examples which you will better understand its point. I suggest you to try solving problems by your own before reading solution.

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Автор STommydx, история, 9 лет назад, По-английски

Hello Codeforces!

I'm proud to announce that Codeforces Round #457 (Div. 2) will be held on 19 Jan, 14:35 UTC. The problemset is authored by southball, longhuenchan and me (STommydx). It is our first round in Codeforces and hope you all find the problems interesting.

We would like to thank the following people as the round would not be possible without their kind help: vintage_Vlad_Makeev for coordinating the round, Arpa for testing the problems and MikeMirzayanov for the great Polygon and Codeforces platform.

The contest will consist of 5 problems and you'll be given 2 hours to solve them. The scoring distribution will be announced close to the start of the round as tradition.

Let me close this blog post by answering the most frequently asked question in Codeforces. This round is rated for all Div. 2 participants. As usual, Div. 1 participants can join out of competition.

Good luck and high ratings!

UPD:

Scoring distribution: 500-1000-1500-2250-2500

UPD2:

We are extremely sorry for the situation for problem B. We are figuring out a correct solution for problem B. I hope you all enjoy the rest of the problems.

UPD3:

The round is over. Congratulates to the winners!

Div2:

  1. ustatt
  2. HanaElhami
  3. SorryBahadir
  4. ntv
  5. Om_nik

Div1+2:

  1. eddy1021
  2. chemthan
  3. nhho
  4. fmota
  5. ustatt

The editorial will be available tomorrow.

UPD4:

Editorial is ready!

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Автор vovuh, история, 9 лет назад, По-русски

Привет, Codeforces!

13 января в 16:05 по Москве начнётся Educational Codeforces Round 36.

Продолжается серия образовательных раундов в рамках инициативы Harbour.Space University! Подробности о сотрудничестве Harbour.Space University и Codeforces можно прочитать в посте.

Этот раунд (уже по традиции) будет рейтинговым для Div. 2. Соревнование будет проводиться по немного расширенным правилам ACM ICPC. После окончания раунда будет период времени длительностью в один день, в течение которого вы можете попробовать взломать абсолютно любое решение (в том числе свое). Причем исходный код будет предоставлен не только для чтения, но и для копирования.

Вам будет предложено 7 задач на 2 часа. Мы надеемся, что вам они покажутся интересными.

Задачи вместе со мной готовили Михаил awoo Пикляев, Иван BledDest Андросов и Сергей sslotin Слотин.

Удачи в раунде! Успешных решений!

У меня также есть сообщение от наших партнёров, Harbour.Space University:

As we get ready to dive into the second week of the year, we want to update you all on the upcoming Hello India x Russia Programming Bootcamp! So far 25 teams have registered, with more signing up daily.

As a reminder, the boot camp will take place from March 22nd to March 30th, 2018, at the Amrita School of Engineering campus, India. The Coordinator of the Programming Committee, and head coach will be two time ACM-ICPC world vice-champion Gleb GlebsHP Evstropov.

You can find more information and registration, click here

For those of you who need financial support for the boot camp, please fill up the register form, then we will contact you and prepare an official sponsorship request letter for you to present to your University, University’s IT partners or your potential employer.

Поздравляем победителей:

Rank Competitor Problems Solved Penalty
1 JustasK 7 265
2 uwi 7 275
3 KrK 7 277
4 LHiC 7 284
5 latte0119 7 331

Поздравляем лучших взломщиков:

Rank Competitor Hack Count
1 halyavin 725:-45
2 zscoder 34:-10
3 M3hran 28:-3
4 OlegZubkov 28:-3
5 neelbhallabos 21

Было сделано 2023 успешных и 1300 неудачных взломов.

И, наконец, поздравляем людей, отправивших первое полное решение по задаче:

Problem Competitor Penalty
A Dalgerok 0:00
B Rafbill 0:03
C yashar_sb_sb 0:11
D eddy1021 0:25
E bmerry 0:11
F ThePilgrim 0:15
G MrDindows 0:19

UPD Разбор

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Автор tourist, история, 9 лет назад, По-русски

Hello 2018!

Если вы думаете, чем бы заняться в восьмой день 2018 года, обратите внимание! Первый раунд для обоих дивизионов в новом году начнётся уже 8 января в 17:35 по московскому времени (время в вашем часовом поясе).

Как новый год встретишь, так его и проведёшь, поэтому четыре важные составляющие Hello 2018 будут такими же, как у Good Bye 2017:

  • Два дивизиона вместе
  • 8 задач
  • 2 часа 30 минут
  • Рейтинговый

Однако будет и существенное отличие:

  • Другие задачи

Задачи этого раунда предложили и подготовили YakutovDmitriy, budalnik и я.

Спасибо также и всем, без кого этот раунд бы не состоялся здесь и сейчас: AlexFetisov, Golovanov399, KAN, MikeMirzayanov, PavelKunyavskiy, qwerty787788, VArtem, winger.

Удачи!

Стоимости задач: 500 — 750 — 1000 — 1250 — 1750 — 2250 — 3000 — 3500.

Разбор задач доступен по ссылке.

Поздравляем победителей!

  1. Um_nik
  2. desert97
  3. yosupo
  4. dotorya
  5. zeliboba
  6. FizzyDavid
  7. Endagorion
  8. .o.
  9. SpyCheese
  10. Kostroma

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Анонс Hello 2018
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