By I_love_Nastya, 12 years ago, translation, In English

Hello everybody!

I am glad to announce that Codeforces Round #138 will be held today at 19:30 MSK. I (Vasiliy Vadimov) am the author of this round. It is my first Codeforces round, I just helped other authors to prepare their rounds before.

I would like to thank Gerald Gerald Agapov for his help in the preparing of the round and Maria Delinur Belova for translation of the problems' statements in English. Also I am grateful to Mike MikeMirzayanov Mirzayanov for such an excellent contest system as Codeforces.

Good luck! I hope you will be interested in the problems.

The point distribution is standard in both divisions (500-1000-1500-2000-2500).

UPD. Attention! D language will not be available on this contest.

UPD2. The round is over, top-5 in both divisions:

Div1:

  1. Petr
  2. tourist
  3. peter50216
  4. Shik
  5. Egor

Div2:

  1. ecnerwala
  2. ordcoder
  3. scipianus
  4. jonathanpaulson
  5. void_rank

Congratulations to the winners!

Also I am apologising for mistakes in statement of problem div1 A/div2 C. The tutorial will be published tomorrow.

UPD3. The tutorial is available here.

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By izban, 12 years ago, translation, In English

Hello everybody!

Today, Codeforces Round #137 for the Second Division Participants will take place. As usual, all other interested persons can take part in it.

The problems have been developed by a group of authors from Vladivostok: Ilya Zban (izban), Alexey Evsyukov (aevsyukov), Zakhar Voit (zakharvoit).

Gerald Agapov (Gerald) has greatly contributed as well and we thank him for it. The translation of the problems has been done by Maria Belova (Delinur) — thanks to her! We are also grateful to Pavel Kunyavskiy (PavelKunyavskiy), who has help us in the preparation of the contest.

We hope you will have fun and like this round. The points distribution will be standard (500 — 1000 — 1500 — 2000 — 2500).

Good luck to everybody!

UPD: The start will be 15 minutes later due to technical reasons, we apologize.

UPD2: Congratulation to winners!

In second division:

1: zxl0714

2: resodo

3: mugurelionut

4: hmspmy077

5: CCC

6: white_rich_beautiful

7: loveSakura

8: gcwtft827

9: yuxingdubai

10: b821213

In first division:

1: navi

2: Shik

3: SteamTurbine

UPD3: The editorial is published.

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By victor_kamashev, 12 years ago, translation, In English

For the first time, the traditional "Izhevsk Training Camp" will be held simultaneously in Izhevsk and Yevpatoria (Ukraine).

Please find attached the newsletter and the camp schedule as well as the translated newsletter in English. Please note that the trasnlation is unofficial and is provided for reference only.

Newsletter (rus)
Newsletter (eng)
Camp schedule (rus)

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By witua, 12 years ago, translation, In English

Tomorrow, in 4 and half hours before the end of the summer (check your zone), Codeforces Round #136 will take place. I am the author of this round, it's my 6th contest on CF.

Gerlad Agapov (Gerald) is helping me in preparing the problems. Translations will be done by Maria Belova (Delinur). Thanks to them.

I hope you will like this round. The points distribution will be standart.

Thanks!

7 user in the first division solved all 5 problems, here they are:

  1. peter50216
  2. yeputons
  3. winger
  4. rng_58
  5. RAD
  6. al13n
  7. KADR

Meanwhile, in second division, Top-4 looks like this:

  1. blue.boy
  2. de_troit
  3. lxyxynt
  4. ilona

You can find the editorial of the contest here.

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By MikeMirzayanov, 12 years ago, translation, In English

Hello!

Only few hours left before Codeforces Round # 135 (Div. 2). We are preparing the round in Petrozavodsk where traditional training camp for ACM-ICPC is going now. Today is a day of rest here, many participants gone to a trip to Kizhi. The main contest authors are me and Gerald. Special thanks to Aksenov239 who tested the round. Thank Delinur for translation.

The problems will be sorted by expected difficulty, the scores are dynamic.

Wish you fun round!

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By meret, 12 years ago, In English

Welcome to Codeforces Round #134!

After over two years, it is again my great pleasure to be the main problemsetter of a contest on Codeforces. Thanks a lot to Gerald for helping me organize the round. I hope you will enjoy solving the problems as much as we enjoyed preparing them for you.

Dynamic scoring will be used, but the problems will be ordered by their expected difficulty, from easiest to hardest. Are our predictions correct? I am eager to see. :-)

Good luck!

Update: The contest is over! Here are the results:

First division:

  1. rng_58

  2. panyuchao

    pieguy

  3. tourist

  4. Petr

  5. ACRush

  6. Zhukov_Dmitry

All contestants from the top seven solved three problems. Note that there was a tie for second place. :-)

Second division

  1. dsbuaa

  2. hqztrue

  3. Gullesnuffs

In second division, seventeen contestants solved four problems. Nobody managed to crack E; it was also present in the first division as problem C, and proved tricky even for the experienced competitors.

Congratulations to the winners!

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By Ripatti, 12 years ago, translation, In English

Hello everyone.

That is the 133th Codeforces round. Specially for the 2nd division. Contestants from the 1st division can solve the round out of competition.

Round is prepared by Ripatti , Gerald , Aksenov239 , Delinur and MikeMirzayanov .

The round will use dymanic scoring system. Problems will be ordered in random manner (see UPD1). If you want get more happiness from solving that round, please, read statements of all problems.

Good luck!

UPD1. Jury members discussed and have decided to rearrange problems in expected order of difficulty.

UPD2. Contest ended. Winners:
1. karensun522
2. stostap
3. sisterX
4. BiliBili
solved all 5 problems. Congratulations!

Editorial will be soon tommorow (I am very tired =_=, but now you can try to read russian editorial here).

UPD3. Editorial in English.

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By NALP, 12 years ago, translation, In English

Hi!

A few hours later you're lucky to participate in Codeforces Round #132 for Div.2 participants, but traditionally the others can take part out of the competition. It has been prepared by me (NALP), Edvard Davtyan (Edvard), Vitaly Aksenov (Aksenov239), Gerald Agapov (Gerald), Mary Belova (Delinur) и Mike Mirzayanov (MikeMirzayanov).

Traditionally I wish good luck, accepted solutions and successful hacking attempts for you!

Especially, we want to wish grand results and good luck to all sportsmens, who are representing their countries on XXX Olympic Games in London!

Today it is decided to use dynamic scoring system. But the problems will be sorted from low difficulty to high by authors' opinion!

UPD: The Round is finished, thanks to all for participation! We hope you have got fun!

UPD: Congratulation to winners!

  1. yooo — solved all problems!

  2. zzy

  3. High_Rich_Handsome

  4. bookcity_clock

  5. capythm

UPD: Tutorial in English is published!

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By Sereja, 12 years ago, translation, In English

Hello everybody!

Welcome all to Codeforces Round #131, which will be held on Monday, 30th of July at 19:30 MSK. I am (Sergey Nagin) an author of the problems. This will be my First Codeforces round and I hope it won't be the last one :).

I would like to thank Mike Mirzayanov(MikeMirzayanov) who made this contest possible, Roman Furko(Furko) and Gerald Agapov(Gerald) for helping to prepare this round and Maria Belova(Delinur) for the translation of problem statements into English. I hope that problems will be interesting for you.

Good luck!

Problems’ point values in Division 1 are 1000-1000-1500-2000-2500. Problems’ point values in Division 2 are 500-1000-2000-2000-2500.

I strongly recommend you to read ALL the problems.

The contest is over! Congratulations' to winners!

First division:
1 place: Egor
2 place: Petr
3 place: tourist
Second division:
1 place: antimatter
2 place: c175353
3 place: takaramono

I hope, that problems were interesting for you.

You can view tutorial.


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By HolkinPV, 12 years ago, translation, In English

Welcome, friends)

We are glad to introduce you regular Codeforces round #130 for Div.2 participants. Everyone can traditionally participate in it. There were some problems with registration of Div.1 participants, but now everything is alright)

Problems are prepared by command of authors: Pavel Kholkin (HolkinPV), Nikolay Kuznetsov (NALP) and Gerald Agapov (Gerald). Traditionally thanks to Michael Mirzayanov (MikeMirzayanov) for perfect Codeforces system and Mary Belova (Delinur) for translating problems. Also thanks to Alexander Kouprin (Alex_KPR) and Pavel Kunyavskiy (PavelKunyavskiy) for their help.

And again score distribution will be dynamic) More information you can find here.

Note that all problems will be given in random order.

We wish you good luck, successful hacks and high rating!

UPD: the contest is over, no matter what, we hope you enjoyed the competition

UPD2: The authors apologize for the situation with the problem E. The problem has affected a small number of participants from div2 (22 participants) and the solution of original version of the problem doesn’t differ a lot (in most solutions is sufficient to remove a couple of lines, solutions become more simple). Therefore, it was adopted the following decision:

  • for all 22 participants,who has problems with problem E and will have decrease of rating, the round is unrated.
  • for everybody else the round is rated

UPD3: after recalculation it was found that there are 20 such participants, not 22

UPD4: unsuccessful hacks, which answers differed from the correct whitespaces, are decided to ignore

UPD5: tutorial can be found here

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