Hello!

ICPC Southern and Volga Russian Regional Contest (Northern Eurasia) 2019 has ended on October 15. There were 76 teams onsite in Saratov, most of them were invited because of their result on the qualification stage.

On Oct/27/2019 12:35 (Moscow time) will start online-mirror 2019-2020 ICPC, NERC, Southern and Volga Russian Regional Contest (Online Mirror, ICPC Rules, Teams Preferred).

In this contest I play a role of Cheif Judge and the jury teams consists of ex-participants of ICPC from Saratov and jury members from other cities. Many thanks to all of them! I hope you will like the problems!

I invite ICPC teams and individual participants of Codeforces competitions to take part! Sure, the contest will be unrated.

— MikeMirzayanov

Hi,

We would like to invite you to participate in the live (with 30-minute delay) online mirror contest of The 2019 ICPC Asia Jakarta Regional Contest (our regional website, our regional in ICPC website, official contest portal) this weekend. The online mirror contest will start on Oct/27/2019 06:30 (Moscow time).

The contest consists of several problems and you can solve them in 5 hours.

See you on top of the leaderboard.

UPD1: Thanks for participating. The problems should be available for upsolving. The soft-copy of the problem analysis (the same as the one distributed to all contestants during the awarding ceremony) is available here.

UPD2: The full problem repository is available here. The full problem repository for Indonesia National Contest (INC) 2019, which is the national programming contest that serves as the online preliminary round for Indonesian teams to advance to The 2019 ICPC Asia Jakarta Regional Contest, is also available here. The problems are also available for upsolving in TLX (INC and ICPC)

We are aware about the issues with rating in Division 2. MikeMirzayanov is on it and will fix everything soon.

Congrats to the winners!

Technocup edition:

1. cookiedoth
2. MaksymOboznyi
3. AlFlen
4. talant
5. DANDROZAVR

Div. 1 round:

1. Benq
2. jqdai0815
3. tourist
4. Um_nik
5. TLE

Div. 2 round:

1. BBumblebee
2. twytch19
3. zhongyuwei
4. kpink
5. 1LLUS0RY

Analysis can be found here (if it doesn't show the analysis, just wait for a little bit).

Scoring distribution:

elimination round: 500-750+750-1500-2000-2750-3250-3750

division 2: 500-750+750-1500-2000-2750-3250

division 1: 500-1000-1750-2250-2750-3250Hi Codeforces!

This weekend, on Oct/26/2019 14:05 (Moscow time) we will hold Codeforces Round 596. It is based on problems of Technocup 2020 Elimination Round 2 that will be held at the same time.

Technocup is a major olympiad for Russian-speaking high-school students, so if you fit into this category, please register at Technocup 2020 website and take part in the Elimination Round 2.

Div. 1 and Div.2 editions are open and rated for everyone. As usual the statements will be provided in English and in Russian. Register and enjoy the contests!

Have fun!

Hello Codeforces!

On Oct/24/2019 18:05 (Moscow time) Educational Codeforces Round 75 (Rated for Div. 2) will start.

Series of Educational Rounds continue being held as Harbour.Space University initiative! You can read the details about the cooperation between Harbour.Space University and Codeforces in the blog post.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 7 problems and 2 hours to solve them.

The problems were invented and prepared by Roman Roms Glazov, Adilbek adedalic Dalabaev, Vladimir vovuh Petrov, Ivan BledDest Androsov, Maksim Neon Mescheryakov and me. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Our friends at Harbour.Space also have a message for you:

Hello Codeforces,

We would like to invite all of you to Mike Mirzayanov's course Advanced Algorithms and Data Structures, which will take place in Barcelona, from the 6th to 24th of January, 2020.

The course will consist of three weeks of training, 5 training days each week. The program includes daily lectures and practical exercises. It will be quite educational, insightful and entertaining!

And you will have the opportunity to meet and talk with Mike, who will be happy to share his knowledge and stories about the history of Codeforces.

We are happy to offer a special price of 1,000 EUR* for all Codeforces users.

Register on the page below and we will contact you for the next steps. Hurry up! Only 10 spots available.

* The cost does not include travel or accommodation.

We would also like to recommend you an article published on our blog last week about the 5 reasons why traditional universities can’t keep up with humanity.

UPD: The start of the round is postponed by 30 minutes.

Congratulations to the winners:

96 successful hacks and 196 unsuccessful hacks were made in total!

And finally people who were the first to solve each problem:

UPD: Editorial is out

Hello!

Codeforces supports a wide range of languages. Just yesterday I supported Java 11.

On the other hand, my website is not only just open public rounds and trainings, but also an advanced system of groups, custom domains and mashups. This ecosystem makes it possible to conduct private trainings, local contests/olympiads, provides the work of computer science clubs, and so on.

Sometimes you ask me to somehow limit the languages that can be used in a particular contest. For example, an official competition is held that does not support Rust. Or this contest is a practical session specifically for classes in Python.

Now you can configure allowed programming languages (more precisely, their groups) for your mashups and private trainings. Thanks for the help to geranazavr555 who helped to realize this opportunity!

Here are some screenshots of how it looks in action.

Edit a contest settings to specify the list of allowed languages.

You can choose program languages groups your contest supports.

Hope you enjoy the feature,
— MikeMirzayanov

UPD: Thanks to Daria nooinenoojno Stepanova, Mikhail awoo Piklyaev and Artem Rox Plotkin for help with round preparation!

UPD2: Editorial is published!

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Hello! Codeforces Round 595 (Div. 3) will start at Oct/22/2019 17:35 (Moscow time). You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over.

You will be given 6 or 7 (or 8) problems and 2 hours to solve them.

Note that the penalty for the wrong submission in this round (and the following Div. 3 rounds) is 10 minutes.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participants of the third division, you must:

• take part in at least two rated rounds (and solve at least one problem in each of them),
• do not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.

Thanks to MikeMirzayanov for the platform, help with ideas for problems and for coordination of my work. Thanks to my good friends Mikhail awoo Piklyaev, Maksim Neon Mescheryakov and Ivan BledDest Androsov for help in round preparation and testing the round.

Good luck!

I also would like to say that participants who will submit wrong solutions on purpose and hack them afterwards (example) will not be shown in the hacking leaders table.

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Hi everybody,

This Sunday there will be a XVII Moscow Team Olympiad, high school students competition based in Moscow that is an elimination contest for All-Russian Team Olympiad. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Open Olympiad, Moscow Olympiad for Young Students and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583).

Round will be held at Oct/20/2019 12:05 (Moscow time) and will last for 2 hours. Each division will have 6 problems.

Problems are prepared by wrg0ababd, vintage_Vlad_Makeev, DebNatkh, grphil, voidmax, vintage_Vlad_Makeev, volcolac, Sehnsucht, isaf27, cdkrot, Flyrise, budalnik, platypus179, Endagorion under my supervision with great help of GlebsHP, meshanya, Endagorion, Zlobober and Helen Andreeva.

Thanks to cdkrot for the round coordination and statement translation, and also thanks for MikeMirzayanov for systems codeforces and polygon, which was used to prepare problems of this olympiad.

Good luck everybody!

UPD1: Winners!

Div. 1:

1. TLEwpdus
2. rhrnald
3. ainta
4. dorijanlendvaj
5. jqdai0815
6. maroonrk
7. djq_cpp
8. kort0n
9. Marcin_smu
10. 300iq

Div. 2:

1. lolkekaidarbek
2. qdd
3. mathusalen
4. conan1412yang99
5. fauzdar65
6. DeepThought42
7. mikeleven
8. AnnieCai
9. liuandi6
10. jyf111

Editorial will be published soon.

UPD2: Editorial

Hello, Codeforces!

I'd like to invite you to take part in Codeforces Round 593 (Div. 2). It will held on Oct/17/2019 16:35 (Moscow time). The round will be rated for the participants with rating lower than 2100.

You will be given 6 problems and 2 hours to solve them.

Scoring distribution: 500—1000—1000—1750—2000—2500.

The problems of this round were developed by me. Thanks a lot to isaf27 for his excellent coordination, to Mike MikeMirzayanov Mirzayanov for Codeforces and Polygon platform, and to mnaeraxr, antontrygubO_o, NIWIS, win11905 for testing.

This is my first round ever. I hope everyone will enjoy it.

Good luck!

UPD: The round is over! Congratulations to the winners:

Div.1 + Div.2 participants:

1. LayCurse
2. nuip
3. Geothermal
4. liouzhou_101
5. Pelmelnik2

Official participants:

1. Pelmelnik2
2. lrvideckis
3. zml
4. DAL_DAL_USHEL
5. phosphoric

UPD: Now the Editorial is available.