By _jte_, 9 years ago, translation, In English

Hi all, 


Today we would like to invite you to take part in round #86. Round is prepared by Andrew Malevich (aka Kenny_HORROR) and me, Taras Brzezinsky. We are students of Belarusian State University. We would like to thank  MikeMirzayanov ,  it4.kp , RAD , Gerald и Fefer_Ivan for helping and advice in preparing round and  Delinur for translation.

While participating, you will get known with boy Peter and remember some of his school days to help him to solve some problems

The points for the problems in Div 1 & 2 will be: 500-1000-1500-2000-2500.

New service "Virtual contest" will be unavailable during the round due to possible instability.

Good luck to everyone!

UPD

The contest is finished, ratings are updated. 
Congrats to winners:
DIV1:
2) KADR
3) yaro
5) Egor

DIV2: 
4) lxn

Editorial is currently available, the whole problem set analysis will be added in few hours.

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By MikeMirzayanov, 9 years ago, translation, In English
Hi everybody!

As some of you have already noticed, we are introducing the innovation &mdash a virtual contest system. I guess this term was invented as far back as in 2002, as we were working on the site http://acm.sgu.ru/. Besides we were the first ones to come up with and carry out the interesting idea: enable the users to run the past contests in a special mode that would imitate a real competition. It feels just like a real contest with real contestants competing alongside with the participant who writes a virtual contest.

The idea was a success and it was picked up by some online judges. Although frankly speaking, those ideas haven't been carried out by the many.

And now it's time to introduce the virtual contest system to Codeforces! Of course, the original Codeforces rules aren't easily converted to virtual form. That's why all past Codeforces contests will be available as virtual contests by ACM-ICPC rules. In light of oncoming ACM-ICPC subregional and regional contests it can be regarded as yet another opportunity to train.

Virtual contests are available to individuals as well as to teams. If you participate as a team, please make sure that the registered team represents all your team members and nobody else. If it is not the case, change it. So far there's only one contest available for alpha-testing: it's Codeforces Beta Round #76 (Div. 2 Only), but you won't have to wait much - soon all contests will be available in this mode. Now all the past contests are available as virtual contests.

When you take part in virtual contests please follow those simple rules:

  • don't participate if you've already seen the tasks;
  • don't participate if you only want to commit one problem or if you don't want/can't participate in the whole contest;
  • during the contest don't read tutorials, don't use somebody else's code, don't talk to other people;
  • try to make it an efficient and enjoyable training!

I expect some of you to write the offered contest virtually and share your impressions. For example, JKeeJ1e30 has already participated!

I hope you like the new opportunities. We'll add something, too, to give the system final flourish, but in any way we're waiting for your commentaries rich in interesting ideas and suggestions.

MikeMirzayanov and the Codeforces team

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By Seyaua, 9 years ago, In English
Hi to everybody from sunny Petrozavodsk!

Today me and my brother sdya prepared a few interesting problems for you. Because of very tight schedule in Petrozavodsk training camp, that includes rafting and watching anime all night long, we didn't have time to write long problem statements. So enjoy unambiguous short statements and you are welcome to invent some legends for them on your own.

Good luck and have fun!

Contest is over! Congratulations to winners!

Division 1:
  1. dolphinigle
  2. ilyakor
  3. marek.cygan
Division 2:
  1. wuzhengkai
  2. jayi
  3. superpear
Editorial.

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By witua, 9 years ago, translation, In English
Hello!

Welcome to Codeforces Beta Round #84I am Vitaliy Herasimov (witua) and I am an author of today's problems. Thanks to Artem Rakhov (RAD) and Pavel Kuznetsov (it4.kpfor the help and advices in preparing of the rounds, Maria Belova (Delinur) for the statements translation.

Good luck!

Contest is over! Congratulation to winners!

Division 1:

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By Atef, 9 years ago, In English
Hi all,

Today we would like to invite you to take part in round #83 inspired by the ACM practice sessions last year when Dima was visiting the German University in Cairo (GUC).

We have composed the problemset about life in Egypt and the GUC. Hope you will like it :)

The points for the problems in Div 1 & 2 will be: 500-1000-1500-2000-2500.

The writers of the problems are Dima and myself.

We would like to thank RADConnectorit4.kpDelinurand MikeMirzayanovwho greatly helped in preparing this contest.

We wish you a pleasant, educational and successful contest!

The editorial is under construction.

Good luck to everyone!

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By Ripatti, 9 years ago, translation, In English

Good evening.

Today's round is mine, as the previous one. This round will be for participants of the second division. Participants of the first division can take part in the round out of competition.

RADConnectorit4.kp and MikeMirzayanov helped me to prepare this round. Delinur translated statements into English.

Contest will be in the good old tradition of Codeforces. No any innovations, pretty short and clear statements.

Points for problems are standard: 500-1000-1500-2000-2500.

Good luck everyone!


UPD. Round was ended, ratings was updated.

Winners:

1. tsundere

2. jte

3. abacadaea

4. ltaravilse

5. Billy_Herrington

Editorial.

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By Ripatti, 9 years ago, translation, In English

Hello everyone!

I am the author of problems of today round. RADConnectorit4.kp helped me to prepere this contest. Delinur thanslated statements into english.

It will be a thematic contest. And the theme is Disgaea.

Is it possible to survive artef damage that is written by nine-digit number?
Of course, if amount of your health points is ten-digit number.
fans about Disgaea

Disgaea: Hour of Darkness is tactical RPG video game for consoles Playstation 2, PSP и Nintendo DS. So, get acquainted:

Etna, Laharl and Flonne - main characters of the game

The problems involves some aspects of the game mechanics. They are adapted for problems, therefore a bit different from original ones. Please use statements as formal documents.

Some problems have animated pictures. Please ensure that your browser supperts formats APNG or GIF.

Problem points will be standard for contests of Codeforces:
500-1000-1500-2000-2500.

Good luck!

UPD. The contest ended and ratings was recalculated.
:Winners:
1. KADR
2. neal
3. cerealguy
4. ivan.popelyshev
5. tourist

Editorial.

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Announcement of Codeforces Beta Round #81
 
 
 
 
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By Alex_KPR, 9 years ago, translation, In English

Hi all!

Now it's time for 80th Codeforces Beta Round.

The authors of the contest are: Alex_KPRwingerRADConnectorit4.kp. I hope all problems will be interesting for you and not extremely hard. ;)

Today is Connector's birthday — so, let's congratulate him together!

Good luck and have fun!
_____________________________________

Thank you for your action! =)

Top 10 participants in the first division are:

Place
Who
1
 SergeiRogulenko
2
 hos.lyric
3
 Romka
4
 neal
5
 sdya
6
 KADR
7
 ftiasch
8
 niyaznigmatul
9
 dolphinigle
10
 AleX

There are only two participants who beat problem E: the winner of the contest SergeiRogulenko and MBabin who gets 76th place.

Top 3 participants in the second division are:

Place
Who
1
 anrieff
2
 zplinti1
3
 Efgen

Congratulations and good luck at the next time!

Official tutorial will be added later. But AlexanderBolshakov already wrote the tutorial about most of problems.

Problems were translated by Delinur.
_____________________________________

Tutorial is here.

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By Sammarize, 9 years ago, translation, In English

Hello!

I'm, Valeriy Samojlov, graduating student of SPbSU,  present you codeforces beta round 79. Today you will meet with boy Gerald and will help him to solve some living problems. 

Today we have usually cost of problems in both divisions: 500 - 1000 - 1500 - 2000 - 2500.

It my first codeforces round, I hope, problems will be interesting.

I want to thank Artem Rakhov (RAD) for big help with preparation of problems, Makar Krasnoperov (Connector) for some useful remarks and Maria Belova for translation.

Good luck for participants of both dovisions!


Contest is over! Congratulation to winners!

Division 1:

1. RAVEman

2. ilyakor

3. ACRush

Division 2:

1. SuperLight

2. xiaowuc1

3. Timur_Sitdikov

Editoral a appeared.

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By amirali1374, 9 years ago, In English

Hi all!
Unknown Language Round #3 is going to take place on 30th of July. (This very Saturday -- Friday for some parts of the world)
This is the third contest of its type. The rules are easy (and fun):

  1.     Scoring is similar to that of ACM-ICPC.
  2.     The contest is not rated.
  3.     You can submit your code using only one language. This language is a secret and will be announced only when the contest begins! (We'll expect lots of coding bugs and syntax mistakes!)


This is the 100th contest on Codeforces. Congratulations to Mike Mirzayanov for developing a system that grows so fast!

There will be 10 problems overall. The tasks concentrate mainly on coding abilities rather than problem-solving and algorithmic techniques. Tasks are made by Mike Mirzayanov, Kiana Gholampoor, Soroush Farrokhnia , Amir Goharshady and Me (Amirali Mohammadzade).

We're grateful to Artem Rakhov for helping us to prepare the tasks, Maria Belova for translation, Zahra Rohanifar for testing one of the tasks and Hossein Boomari for teaching us to code!

The contest is dedicated to Mike Mirzayanov and Artem Rakhov for their great job at Codeforces and for helping us all improve our coding abilities.

UPD: The contest is over.Only 6 people solved problem J. Congratulations to Peter50216 from Taiwan for winning the contest and to the following 5 people for solving all the taks:

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Announcement of Unknown Language Round #3
 
 
 
 
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