Hello, Codeforces!

I'd like to invite you to Codeforces Round #386 (Div. 2). It'll be held on Sunday, December 18 at 13:35 MSK and as usual Div. 1 participants can join out of competition. Note that round starts in the unusual time!

This round is held on the tasks of the municipal stage All-Russian Olympiad of Informatics 2016/2017 year in city Saratov. They were prepared by Olympiad center of programmers of Saratov SU.

Great thanks to Nikolay Kalinin (KAN) for helping me preparing the contest, to Tatiana Semenova (Tatiana_S) for translating the statements into English, to Mike Mirzayanov (MikeMirzayanov) for the great Codeforces and Polygon platform and to Vladimir Petrov (vovuh), Alexey Ripinen (Perforator), Mikhail Levshunov (Levshunovma), Mikhail Piklyaev (awoo), Aleksey Slutskiy (pyloolex), Ivan Androsov (BledDest), Oleg Smirnov (Oleg_Smirnov) and Roman Kireev (RoKi) for writing solutions and editorials.

It will be a little unusual round — you will be given seven problems and two and half hours to solve them. The scoring distribution will be 500-1000-1500-2000-2500-3000-3000. Good luck everyone!

UPD Editorial

UPD2 Congratulations to the winners!

1. IHaveShort

2. tqyaaaaaaaang

3. UmaThurman

4. Moiezen

5. FIKS_samurai

Hello everyone!

Codeforces round #385 will take place at the unusual usual time of Saturday, 17 December 19:35 MSK.

Thanks to the following people for making this round possible.

• LiChenKoh, xiaowuc1 for helping develop problems and discussing ideas with me.
• winger, AlexFetisov for testing the problems
• GlebsHP for all his valuable help with the round.
• MikeMirzayanov for the great Codeforces and Polygon platforms.

As usual, contestants will have 2 hours to solve 5 problems. Hope you will enjoy the problems!

Scoring will be announced closer before the round.

EDIT: It may be helpful to read the Interactive Problem Guide before the round for both divisions.

EDIT 2: The scoring distribution will be unusual:

Div2: 500-1000-1500-2250-2750

Div1: 500-1250-1750-2250-2500

EDIT 3: While you wait for system testing, here is a quick editorial: http://codeforces.me/blog/entry/49126

EDIT 4: Congratulations to the winners!

Div1:

1. tourist
2. Petr
3. PavelKunyavskiy
4. YuukaKazami
5. W4yneb0t

Div2:

1. Akulen
2. Rfox
3. tpablo
4. theodor.moroianu
5. YouAndI

BSUIR Open Archives (polygon contests packages and statements)

• 2019-2020 10th BSUIR Open Programming Championship. Semifinal (blog)

• 2018-2019 9th BSUIR Open Programming Championship. Final (blog)

• 2018-2019 9th BSUIR Open Programming Championship. Junior

• 2018-2019 9th BSUIR Open Programming Championship. Semifinal

• 2017-2018 8th BSUIR Open Programming Contest. Final (blog)

• 2017-2018 8th BSUIR Open Programming Contest. School final

• 2017-2018 8th BSUIR Open Programming Contest. Semifinal

• 2016-2017 7th BSUIR Open Programming Contest. Final (blog)

• 2016-2017 7th BSUIR Open Programming Contest. Semifinal

• 2015-2016 6th BSUIR Open Programming Contest. Final (blog)

• 2015-2016 6th BSUIR Open Programming Contest. Semifinal

• 2014-2015 V BSUIR Open Programming Championship (blog)

• 2013-2014 BSUIR Open Programming Championship. Final (blog)

Hello, Codeforces community!

Codeforces Round #384 for the second division will take place on Wednesday, 14 December 17:35 MSK. Traditionally, first division participants will be able to take part out of competition.

Round was prepared by Yury hloya_ygrt Shilyaev and me, Kirill kefaa Gulin.

Many thanks to Nikolay KAN Kalinin for his help with the contest preparation and Mike MikeMirzayanov Mirzayanov for the Codeforces and Polygon systems.

You will be offered 5 problems and 2 hours for solving them.

Scoring will be announced closer to the beginning of the round.

UPD: Scoring is 500 — 1000 — 1250 — 2000 — 2500

UPD2. The contest is over! Hope you enjoyed it :)

Editorial

Congratulations to the winners!

Div2:

1. TheBartender

2. Ownz

3. lesskreker

4. xyt520

5. SpinyAnteater

6. y32M-71693993

7. ezLadder

8. tqyaaaaaaaang

9. Fiks_warrior

10. 00001

Div.1:

1. Um_nik

2. kmjp

3. Temirulan

4. zscoder

5. rajat1603

Code Festival 2016 was held in Tokyo on 25-30 of November. Boris qwerty787788 Minaev has shared with us his impressions, and Maxim Zlobober Ahmedov and Nicolay KAN Kalinin shared photos.

— To start with, let's mention that, AtCoder and Indeed company announced the festival. How many quals were there? In what way were they arranged?
— There were 3 contests, in which you could take part. In the first part TOP-10 were selected, in the second one — TOP-5, the third one — TOP-5. To sum up, there are 20 foreigners to be selected.

— Which quals the Japanese had then?
— Probably the same, but 200 participants passed the qual there.

— That means, the event is more orientated on Japanese people?
— The previous years the event was held only for Japanese, this year they decided also to invite some foreigners.

— How long did the contest lasted?
— It was quite short. To pass it you had to solve all the problems. It turned out that in first 15 minutes the first 3 out of 5 problems needed to be hand in, and other two are handed in later — you had to think hard on them. The foreigners had to hand in everything taking into account the penalty time.

— The rules of АСМ?
— Nearly. You don't loose anything for penalty attempts, that means it's possible to submit problems any number of times

— No debugging, no testing — just submit, and that's all?
— Yes, it was possible. In addition they also showed verdict on every test.

— Was it clear from the very beginning that those who passed the samplings would be waited in Japan?
— Yes. They payed for the road — bought the tickets. They fed me a bit during the event. On the fifth day I was invited to the Indeed office. Indeed is the American company, which decided to open an office in Tokyo. For an hour they were talking about what the company is doing, and then there was a diner with the engineers. Five people came, three of them were Russians, who work in Yandex. They were communicating with the Russian-speaking public. They told us, that came to Tokyo because of the desire of traveling.

Organizers provided us with the access to the internet by giving routers including Sim with some already payed traffic. Comment and photo: Maxim Ahmedov

— Is it true that in Japanese offices there are balconies with special plants as a recreation area?
— Exactly in the Indeed office there are no. The engineers said they reconstructed their American office here — they all came from Austin.

The competition was held in a business area of the city, which had huge office buildings made of glass and metal. Comment and photo: Maxim Ahmedov

— How many days did the contest lasted?
— During 4 days, from the early morning, 8 o’clock, till 10 o'clock in the evening. The fifth day was a day off.

Sakura blossoms even in winter. Comment and photo: Nicolay Kalinin

Hello all.

This coming February of 2017 will be a new experience for me: I'll be one of the coaches who will teach at the Barcelona ACM-ICPC Bootcamp hosted by Harbour.Space University. In addition, here are some well-known coaches from our community: Endagorion, GlebsHP, Michael, Jacob and snarknews. The camp will be hosted in collaboration with Moscow Workshops ACM ICPC by MIPT. The same proven effective studying techniques will be used at the Barcelona Bootcamp.

For me, it will be the first teaching experience outside of Russia as well as my first trip to Spain. I’ll do my best to coach you how to solve problems in an efficient fashion. Also, it will be an excellent chance to communicate about Codeforces personally with the real users.

Hello Barcelona Programming Bootcamp, in collaboration with Moscow Workshops ACM ICPC, is an opportunity for teams of different levels to prepare for successful participation in ACM ICPC. The Bootcamp will be split in two divisions:

• Division A. Designed to prepare students to excel and win medals in the next ACM-ICPC World Finals.
• Division B. Designed to help teams prepare for the next season of ACM ICPC Regionals and international competitions. This is an appropriate introduction for teams and students new to the world of ACM ICPC and competitive programming competitions in general. The Division B curriculum features thematic lectures and contests.

The participation fee is €1270 per person (cultural programme, accommodation and meals included). The location in Europe gives the effect of the rather high cost. Anyway, the event is non-profitable for these reasons: To prepare world-wide teams for ACM-ICPC and to scale Russian expertise of coaching on other countries.

The Bootcamp will start on February 6th and will last for 9 days to February 14th. If your team (or you individually) is interested to take part, please register before December 24th, 2016 by the link (discount 20% for registration in time):

Register
to Barcelona ACM-ICPC Bootcamp

You can ask any questions by email [email protected]

Hope to meet you on the Bootcamp,
MikeMirzayanov

Hi!

I'm honored to invite you to Codeforces Round #383, it will be held on 6nd December 14:35 UTC. There will be 5 problems for each division as usual. The contest was prepared by AmirReza Arpa PoorAkhavan and Mehrdad Batman Saberi. It's our first official contest at CodeForces.

The contest stories will be about Arpa and Mehrdad and some events happen with them in Arpa's land, in addition you will get some information about Arpa's land and girls living there (Owf (t = 1)).

I'd like to thank myself (:P) and Mehrdad at first, then Nikolay KAN Kalinin for helping me in preparing problems and Mike MikeMirzayanov Mirzayanov for the great Codeforces and Polygon platforms.

The scoring distribution will be announced later.

Answer for one of your common questions : -Yes, It is rated.

UPD. GL & HF. Hope you came up with Dokhtar-kosh solutions for our Dokhtar-kosh problems.

Urgent information from MikeMirzayanov: due to hardware issues, the round is moved to Tuesday 6th December, 14:35 UTC. We are very sorry this happened. More information is available in this post.

UPD. Scoring distribution: Div.1 : 500-1000-1250-2000-2500, Div.2 : 500-1000-1500-2000-2250.

UPD. Contest is over, hope you have been Joon-Joon of the round :P

Congratulations to winners:

Div.1:

1 . EvenImage

2 . mnbvmar

3 . data_h and nuip (WoW :O)

5 . Phronesis

Sepcial congratulations to anta who solved Div.1 E.

Div.2:

1 . gilcu3

2 . toHisDream

3 . Far

4 . shpsi

5 . orz_liuwei

Editorial is ready.

Hello, Codeforces.

This weekend ITMO University in St. Petersburg with Barnaul, Almaty and Tbilisi will host ACM ICPC Northeastern European Regional Contest.

We have 266 teams (thanks to MikeMirzayanov and snarknews for the link) competing for the chance to go to the ACM ICPC World Finals 2017 which is going to take place in South Dakota, USA.

In ITMO University site 106 teams will compete, including ACM ICPC 2016 World Champions and the team that is leading Opencup ranklist.

We have an Instagram account, we will post there some pictures from contest halls and other weekend activities.

If you are not competing in NEERC, you can try to solve the same problems in mirror. It will take place at 8 AM UTC, December, 4.

Contest scoreboard.

Team name	Team member 1	Team member 2	Team member 3	Total rating
SPbSU Base	aid (2765)	ershov.stanislav (2739)	-XraY- (2551)	8055
MIPT Jinotega	zemen (2741)	ifsmirnov (2721)	Arterm (2506)	7968
ITMO University 1	izban (2762)	enot110 (2550)	Belonogov (2545)	7857
Perm SU Indigenous	I_love_Tanya_Romanova (2650)	mmaxio (2576)	KuchumovIlya (2411)	7637
Saratov SU 1	HellKitsune (2537)	danilka.pro (2485)	IlyaLos (2349)	7371
ITMO University 2	budalnik (2450)	YakutovDmitriy (2422)	SpyCheese (2413)	7285
Belarusian SUIR	netman (2571)	andrew.volchek (2318)	teleport (2247)	7136
SPbSU 3	Kaban-5 (2474)	--Pavel-- (2431)	tunyash (2226)	7131
Ural FU Charmander	Tinsane (2438)	kb. (2363)	KungA (2262)	7063

Good luck to all participants
NEERCNews

University Innopolis is organizing and holding Innopolis Open, an Olympiad in Informatics for secondary school students (until 19 y.o.). The Olympiad consists of two rounds — online contest and the on-site competition (held at Innopolis, Russia).

Winners of the first round will be invited to Innopolis to take part in the on-site competition. During the Olympiad, all participants will be offered a free of charge accommodation, meals and transfer from Kazan to Innopolis and back.

Winners of the second (on-site) round will receive awards and can be enrolled in Innopolis University without any admission tests.

• The first (online contest) round will start on December 18 at 10.00 a.m. (UTC +3).

• The second (on-site) round will take place on February 25-26 in Innopolis city, Russia.

Registration is open until December 15, 2016. Participation is free of charge.

Please follow the link to register and find detailed information.