Junior Challenge is a yearly contest organised by volunteers from the Romanian programming community. You can read more about it in our previous blog post.

The second round takes place on Tuesday, September/05/2017 11:00 (UTC), and it will be unrated.

Contest format:

• You will have to solve 4 tasks in 4 hours.
• There will be full feedback throughout the entire contest.
• The tasks will have partial scoring. The maximum score for each problem will be 100 points.
• There will be no tie breaker, so two users having the same total score at the end of the contest will share the same place in the standings.

Many thanks to Andrei1998, bciobanu, tamionv, geniucos and george_stelian for authoring and preparing the tasks.

Round #46 (Div. 1.5)

The corresponding Round #46 starts at the same time, on Tuesday, September/05/2017 11:00 (UTC). The round will be rated for everyone with a rating below 1775 (this includes yellows).

Contest format:

• You will have to solve 6 tasks in 2 hours and 30 minutes.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

Don't forget to like us on Facebook, VK and follow us on Twitter.

Junior Challenge is a yearly contest organised by volunteers from the Romanian programming community. The contest is addressed to middle school students who want to prepare for the Junior Balkan Olympiad in Informatics, and starting this year, the European Junior Olympiad in Informatics.

This is the first international edition of the contest. There will be two separate competition days, and the rounds will be unrated. The first round takes place on Sunday, September/03/2017 15:00 (UTC).

Contest format:

• You will have to solve 4 tasks in 4 hours.
• The first task will be the easiest one, the other three will be in random order.
• There will be full feedback throughout the entire contest.
• The tasks will have partial scoring. The maximum score for each problem will be 100 points.
• There will be no tie breaker, so two users having the same total score at the end of the contest will share the same place in the standings.

Many thanks to Andrei1998, bciobanu, tamionv, geniucos and george_stelian for authoring and preparing the tasks.

Round #45 (Div. 1.5)

In parallel with Junior Challenge, we will organise two CS Academy rounds, that will be rated for everyone with a rating below 1775 (this includes yellows). The CS Academy contests will consist of all the problems in Junior Challenge, plus some extra easy ones. The corresponding Round #45 starts at the same time, on Sunday, September/03/2017 15:00 (UTC).

Contest format:

• You will have to solve 6 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

We are going to host a new contest at csacademy.com. Round #44 will take place on Wednesday, August/30/2017 15:00 (UTC). This round will be a Div. 2, affecting users with a rating below 1675.

Contest format:

• You will have to solve 5 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

We're going to host a new contest at csacademy.com. Round #43 will take place on Sunday, 27/August/2017 12:00 (UTC). This contest will be a Div1 + Div2, with 7 tasks of varying difficulty that need to be solved in 2 hours.

We are glad to have lucyanna2018 as a problem author.

Prizes

We're going to award the same prizes as the previous Div. 1 + Div. 2 rounds:

1. First place: 100$
2. Second place: 50$
3. One random prize: 50$.

Contest format:

• You will have to solve 7 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

We are going to host a new contest at csacademy.com. Round #42 will take place on Wednesday, August/16/2017 15:00 (UTC). This round will be a Div. 2, affecting users with a rating below 1675.

Contest format:

• You will have to solve 5 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

Don't forget to like us on Facebook, VK and follow us on Twitter.

Привет, Codeforces!

Мы рады сообщить, что собираемся провести новый контест на csacademy.com. Раунд #41 состоится в среду, 09 августа в 18:00 (Мск). Этот раунд рассчитан на оба дивизиона (Div.1 & Div.2), он будет состоять из 7 заданий разной сложности, которые необходимо решить за 2 часа.

Мы рады представить legar как одного из авторов задач.

Призы,

Уже традиционно, призы будут такими же как для предыдущих двух раундов для обоих дивизионов (Div.1 & Div.2):

1. Первое место — 100$
2. Второе место 50$
3. Один произвольный при на выбор: 50$ или футболка с нашим лого CS Academy :)

Формат контеста:

• Вам предлагается решить 7 заданий за 2 часа.
• Мы обеспечиваем обратную связь на протяжении всего конкурса;
• Задачи не будут засчитываться частично: то есть либо вы выполнили задание, либо нет (ACM-ICPC-style);
• Оценки будут присваиваться в динамике: в зависимости от количества пользователей, которые справились с проблемой, оценка будет варьироваться от 100 до 1000;
• Помимо баллов, у каждого участника будет "пенальти", который будет учитываться при определении победителя

О системе пенальти:

• Пенальти вычисляется по следующей формуле: время, потраченное на выполнение последнего выполненного задания + "пенальти" за каждую решённую задачу. "Пенальти" для каждой решенной задачи равен log2 (no_of_submissions) * 5;
• Решения, которые не компилируются или не подходят для примеров тестовых случаев игнорируются;
• После того, как вы решили задачу и отослали результат, вы можете поэкспериментировать с решением, все последующие ответы уже не будут учитываться.

Мы всегда рады вам в наших уютных пабликах на Facebook, VK и конечно в Twitter.

Привет, Codeforces!

Мы рады сообщить, что собираемся провести новый контест на csacademy.com. Раунд #40 состоится в среду, 02 августа в 18:00 (Мск). Этот раунд рассчитан на вторую дивизию (Div. 2), а значит изменение рейтинга коснется только пользователей с рейтингом ниже 1675.

Специальные призы:

В этом раунде мы разыграем 3 специальных приза, а именно индивидуальные занятия с нашим основным составителем задач и действующим тренером,wefgef. Каждое занятие — это сессия длительностью 1 час 30 минут по Skype. Больше деталей вы можете узнать на странице раунда.

Формат конкурса:

• Вам предлагается решить 5 заданий за 2 часа.
• Мы обеспечиваем обратную связь на протяжении всего конкурса;
• Задачи не будут засчитываться частично: то есть либо вы выполнили задание, либо нет (ACM-ICPC-style);
• Оценки будут присваиваться в динамике: в зависимости от количества пользователей, которые справились с проблемой, оценка будет варьироваться от 100 до 1000;
• Помимо баллов, у каждого участника будет "пенальти", который будет учитываться при определении победителя

О системе пенальти:

• Пенальти вычисляется по следующей формуле: время, потраченное на выполнение последнего выполненного задания + "пенальти" за каждую решённую задачу. "Пенальти" для каждой решенной задачи равен log2 (no_of_submissions) * 5;
• Решения, которые не компилируются или не подходят для примеров тестовых случаев игнорируются;
• После того, как вы решили задачу и отослали результат, вы можете поэкспериментировать с решением, все последующие ответы уже не будут учитываться

Мы всегда рады вам в наших уютных группах на Facebook, VK и конечно в Twitter.

Привет, Codeforces!

Мы рады сообщить, что собираемся провести новый контест наcsacademy.com. Раунд #39 состоится в среду, 26 июля в 15:00 (UTC). Этот раунд рассчитан на вторую дивизию (Div. 2), а значит изменение рейтинга коснется только пользователей с рейтингом ниже 1675.

Специальные призы:

В этом раунде мы разыграем 3 специальных приза, а именно индивидуальные занятия с нашим основным составителем задач и действующим тренером,wefgef. Каждое занятие — это сессия длительностью 1 час 30 минут по Skype. Больше деталей вы можете узнать на странице раунда.

Формат конкурса:

• Вам предлагается решить 5 заданий за 2 часа.
• Мы обеспечиваем обратную связь на протяжении всего конкурса;
• Задачи не будут засчитываться частично: то есть либо вы выполнили задание, либо нет (ACM-ICPC-style);
• Оценки будут присваиваться в динамике: в зависимости от количества пользователей, которые справились с проблемой, оценка будет варьироваться от 100 до 1000;
• Помимо баллов, у каждого участника будет "пенальти", который будет учитываться при определении победителя

О системе пенальти:

• Пенальти вычисляется по следующей формуле: время, потраченное на выполнение последнего выполненного задания + "пенальти" за каждую решённую задачу. "Пенальти" для каждой решенной задачи равен log2 (no_of_submissions) * 5;
• Решения, которые не компилируются или не подходят для примеров тестовых случаев игнорируются;
• После того, как вы решили задачу и отослали результат, вы можете поэкспериментировать с решением, все последующие ответы уже не будут учитываться

Мы всегда рады вам в наших уютных группах на Facebook, VK и конечно в Twitter.

The 24th Central European Olympiad in Informatics took place in Ljubljana, Slovenia, during July 10th-15th 2017. The most gifted high school students from 14 countries had the opportunity to prove their knowledge and skills in informatics.

If you didn't participate in the official online mirror and you didn't get the change to read the problem statements yet, we invite you to participate in two unrated contests that will use the tasks from CEOI. The first contest starts on Thursday, July 20, 11:00:00 UTC. The second contest starts on Friday, July 21, 11:00:00 UTC The problem statements will be available in English.

Contest format

• You will have to solve 3 tasks in 5 hours.
• There will be full feedback throughout the entire contest.
• The tasks will have partial scoring. The maximum score for each problem will be 100 points.
• There will be no tie breaker, so two users having the same total score at the end of the contest will share the same place in the standings.

Hello, Codeforces!

We're going to host a new contest at csacademy.com. Round #38 will take place on Wednesday, 19/July/2017 15:00 (UTC). This contest will be a Div1 + Div2, with 8 tasks of varying difficulty that need to be solved in 2 hours and 30 minutes.

We are glad to have tourist as a problem author.

Prizes

We've decided to continue awarding the same prizes as the previous Div. 1 + Div. 2 round:

1. First place: 100$
2. Second place: 50$
3. One random prize, either 50$ or a custom CS Academy T-shirt, whichever the winner wants. :)

Prize update

One random participant will get a private online coaching lesson with Errichto.

Contest format:

• You will have to solve 8 tasks in 2 hours and 30 minutes.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.

Привет, Codeforces!

Мы рады сообщить, что собираемся провести новый контест на csacademy.com. Раунд #37 состоится в среду, 12 июня 2017 18:00 (Мск). Этот раунд рассчитан на вторую дивизию (Div. 2), а значит изменение рейтинга коснется только пользователей с рейтингом ниже 1675.

Специальные призы:

В этом раунде мы разыграем 3 специальных приза, а именно индивидуальные занятия с нашим основным составителем задач и действующим тренером, wefgef. Каждое занятие — это сессия длительностью 1 час 30 минут по Skype. Больше деталей вы можете узнать на странице раунда.

Формат конкурса:

• Вам предлагается решить 5 задач за 2 часа;
• Мы обеспечиваем обратную связь на протяжении всего конкурса;
• Задачи не будут засчитываться частично: то есть либо вы выполнили задание, либо нет (ACM-ICPC-style);
• Оценки будут присваиваться в динамике: в зависимости от количества пользователей, которые справились с проблемой, оценка - будет варьироваться от 100 до 1000;
• Помимо баллов, у каждого участника будет "пенальти", который будет учитываться при определении победителя

О системе пенальти:

• Пенальти вычисляется по следующей формуле: время, потраченное на выполнение последнего выполненного задания + "пенальти" за каждую решённую задачу. "Пенальти" для каждой решенной задачи равен log2 (no_of_submissions) * 5;
• Решения, которые не компилируются или не подходят для примеров тестовых случаев игнорируются;
• После того, как вы решили задачу и отослали результат, вы можете поэкспериментировать с решением, все последующие ответы уже не будут учитываться

Мы всегда рады вам в наших уютных группах на Facebook, VK и конечно в Twitter.

Hello, Codeforces!

The 25th Balkan Olympiad in Informatics takes place in Chișinău, Republic of Moldova, from July 02 (arrival day) to July 08 (departure day) 2017. The most gifted students from the Balkan region of Europe will have the opportunity to prove their knowledge and skills in informatics.

CS Academy will host the online mirrors of both competition days. The second contest starts on Thursday, July 06, 11:00:00 UTC, right after the onsite competition ends. The round will be rated on CS Academy. The problem statement will be available in English.

Contest format

• You will have to solve 3 tasks in 5 hours.
• There will be full feedback throughout the entire contest.
• The tasks will have partial scoring. The maximum score for each problem will be 100 points.
• There will be no tie breaker, so two users having the same total score at the end of the contest will share the same place in the standings.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

We are going to host a new contest at csacademy.com. Round #36 will take place on Wednesday, July/05/2017 15:00 (UTC). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1675.

Special prizes

This round will have 3 special prizes consisting of private coaching lessons with our contest coordinator, wefgef. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. You can find out more details on the contest page.

Contest format:

• You will have to solve 5 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

The 25th Balkan Olympiad in Informatics takes place in Chișinău, Republic of Moldova, from July 02 (arrival day) to July 08 (departure day) 2017. The most gifted students from the Balkan region of Europe will have the opportunity to prove their knowledge and skills in informatics.

CS Academy will host the online mirrors of both competition days. The first contest starts on Tuesday, July 04, 11:00:00 UTC, right after the onsite competition ends. The round will be rated on CS Academy. The problem statement will be available in English.

Contest format

• You will have to solve 3 tasks in 5 hours.
• There will be full feedback throughout the entire contest.
• The tasks will have partial scoring. The maximum score for each problem will be 100 points.
• There will be no tie breaker, so two users having the same total score at the end of the contest will share the same place in the standings.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

We are happy to announce that we're going to host a new contest at csacademy.com. Round #35 will take place on Wednesday, 28/June/2017 15:00 (UTC). If you want to take part in this round you need to register before the contest begins. This contest will be a Div1 + Div2, with 7 tasks of varying difficulty that need to be solved in 2 hours.

We are glad to have geniucos as a problem author.

Prizes

We've decided to continue awarding the same prizes as the previous Div. 1 + Div. 2 round:

1. First place: 100$
2. Second place: 50$
3. One random prize, either 50$ or a custom CS Academy T-shirt, whichever the winner wants. :)

Contest format:

• You will have to solve 7 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.

Later Edit:

Congratulations to the winners:

1. tourist
2. snuke
3. kmjp
4. RomaWhite
5. W4yneb0t

And to the random prize winner, D0GEzilla!

Also, the editorial has been published. Hope you enjoyed the contest!

Hello, Codeforces!

We are happy to announce that we're going to host a new contest at csacademy.com. Round #34 will take place on Wednesday, June/21/2017 15:00 (UTC). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1675. Unrated users will also be affected. High rated coders can participate unofficially.

If you want to take part in this round you need to register before the contest begins. As this is a Div. 2, it will consist of 5 tasks of more accessible difficulty.

Special prizes

This round will have 3 special prizes consisting of private coaching lessons with our contest coordinator, wefgef. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. The topics approached during the lesson will be the choice of the winners. The prizes will be distributed as follows:

• 1 random prize for the top 20%
• 1 random prize for the next 30%
• 1 random prize for the bottom 50%

Contest format:

• You will have to solve 5 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

We are happy to announce that we're going to host a new contest at csacademy.com. Round #33 will take place on Wednesday, June/14/2017 15:00 (UTC). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1675. Unrated users will also be affected. High rated coders can participate unofficially.

If you want to take part in this round you need to register before the contest begins. As this is a Div. 2, it will consist of 5 tasks of more accessible difficulty.

Special prizes

This round will have 3 special prizes consisting of private coaching lessons with our contest coordinator, wefgef. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. The topics approached during the lesson will be the choice of the winners. The prizes will be distributed as follows:

• 1 random prize for the top 20%
• 1 random prize for the next 30%
• 1 random prize for the bottom 50%

Contest format:

• You will have to solve 5 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

We are happy to announce that we're going to host a new contest at csacademy.com. Round #32 will take place on Thursday, 08/June/2017 15:00 (UTC). If you want to take part in this round you need to register before the contest begins. This contest will be a Div1 + Div2, with 7 tasks of varying difficulty that need to be solved in 2 hours and 30 minutes.

Prizes

Given that this round number is a power of 2 (and powers of 2 have a special place in a programmer's heart), we decided to award three prizes:

1. First place: 100$
2. Second place: 50$
3. One random prize, either 50$ or a custom CS Academy T-shirt, whichever the winner wants. :)

Contest format:

• You will have to solve 7 tasks in 2 hours and 30 minutes.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.

Later Edit:

Congratulations to the winners:

1. tourist
2. anta
3. yutaka1999
4. lexuanan
5. lucyanna2018

Also, the editorial has been published. Hope you enjoyed the contest!

Hello, Codeforces!

CS Academy will continue continue to host the online mirrors of Romania's National Selection Camps for IOI 2017. Round #6 takes place on Tuesday, 06 June 13:00 (UTC). The round will be unrated for all users. The statements will be available in English. If you want to take part in this round you need to register before the contest begins.

Contest format

• You will have to solve 3 tasks in 5 hours.
• There will be full feedback throughout the entire contest.
• The tasks will have partial scoring. The maximum score for each problem will be 100 points.
• There will be no tie breaker, so two users having the same total score at the end of the contest will share the same place in the standings.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.

Привет, Codeforces!

Мы рады сообщить, что собираемся провести новый контест на csacademy.com. Раунд #31 состоится во вторник, 30 Мая 2017 15:00 (UTC). Если вы хотите принять участие в этом раунде, Вам необходимо зарегестрироваться до его начала. Этот раунд рассчитан на Div1 + Div2, с 7 заданиями разной сложности, которые необходимо решить за 2 часа.

Мы рады представить Lewin как одного из создателей задач.

Формат конкурса:

• Вам предлагается решить 7 задач за 2 часа.
• Как обычно, мы обеспечиваем обратную связь на протяжении всего конкурса.
• Задачи не будут засчитываться частично: то есть либо вы выполнили задание, либо нет (ACM-ICPC-style);
• Оценки будут присваиваться в динамике: в зависимости от количества пользователей, которые справились с проблемой, оценка будет варьироваться от 100 до 1000;
• Помимо баллов, у каждого участника будет "пенальти", который будет учитываться при определении победителя.

О системе пенальти:

• Пенальти вычисляется по следующей формуле: время, потраченное на выполнение последнего выполненного задания + "пенальти" за каждую решённую задачу. "Пенальти" для каждой решенной задачи равен log2 (no_of_submissions) * 5.
• Решения, которые не компилируются или не подходят для примеров тестовых случаев игнорируются.
• После того, как вы решили задачу и отослали результат, вы можете поэкспериментировать с решением, все последующие ответы уже не будут учитываться.

Если вы обнаружите ошибки или баги, пожалуйста напишите нам по адресу contact@csacademy.com или в комментариях ниже.

Вы можете найти нас на Facebook, VK, а так же Twiter.

Привет, Codeforces!!

CS Academyпродолжаем зеркальную трансляцию Национального отборочного тура IOI 2017 (Румыния). Раунд #5 состоится в среду, 24 Maя 18:00 (Мск). Раунд будет рейтинговым для всех пользователей. Условия будут доступны на английском и румынском языках. Перед участием необходимо зарегестрироваться.

Формат раунда:

• Вам предлагается решить 3 задачи за 5 часов.
• Мы обеспечиваем обратную связь на протяжении всего контеста.
• Задачи могут быть засчитаны частично, максимальная оценка для каждого задания — 100 баллов.
• Пенальти не будет, это значит что в случае, если двое участников набирают одинаковое количество баллов, в конце они разделят одно место на двоих.

Если Вы обнаружите ошибки или баги, пишите нам на contact@csacademy.com или в комментариях ниже.

Вступайте в наши сообщества в Facebook, VK, а так же Twitter.

Hello, Codeforces!

We are happy to announce that we're going to host a new contest at csacademy.com. Round #30 will take place on Wednesday, May/24/2017 12:00 (UTC). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1650. Unrated users will also be affected. High rated coders can participate unofficially.

If you want to take part in this round you need to register before the contest begins. As this is a Div. 2, it will consist of 5 tasks of more accessible difficulty.

Special prizes

This round will have 3 special prizes consisting of private coaching lessons with our contest coordinator, wefgef. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. The topics approached during the lesson will be the choice of the winners. The prizes will be distributed as follows:

• 1 random prize for the top 20%
• 1 random prize for the next 30%
• 1 random prize for the bottom 50%

Contest format:

• You will have to solve 5 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

Don't forget to like us on Facebook, VK and follow us on Twitter.

Hello, Codeforces!

CS Academy will continue continue to host the online mirrors of Romania's National Selection Camps for IOI 2017. Round #4 takes place on Monday, 22 May 13:00 (UTC). The round will be unrated for all users. The statements will be available in English and Romanian. If you want to take part in this round you need to register before the contest begins.

Contest format

• You will have to solve 3 tasks in 5 hours.
• There will be full feedback throughout the entire contest.
• The tasks will have partial scoring. The maximum score for each problem will be 100 points.
• There will be no tie breaker, so two users having the same total score at the end of the contest will share the same place in the standings.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.

Привет, Codeforces!

Мы проводим очередной раунд на нашем сайте csacademy.com. Раунд #29 состоится в среду, 17-мая-2017 18:00 (UTC). Этот раунд создан специально для второго дивизиона (Div.2), что означает что рейтинг изменится только у пользователей с общим счётом ниже 1650, а также пользователей без рейтинга. Пользователи с более высоким рейтингом могут принять участие неофициально.

Если вы хотите принять участие в этом раунде, Вам необходимо зарегестрироваться перед началом соревнования. Этот раунд создан для второго дивизиона (Div2.), традиционно он будет состоять из 5 задач средней сложности.

Специальные призы:

В этом раунде мы разыграем 3 специальных приза, а именно индивидуальные занятия с нашим основным составителем задач и действующим тренером,wefgef. Каждое занятие — это сессия длительностью 1 час 30 минут по Skype. Тема индивидуального урока может быть выбрана победителем самостоятельно. Призы будут распределяться следующим образом:

• 1 случайный приз для топ 20%;
• 1 случайный приз для для следующих 30%;
• 1 случайный приз для остальных 50%

Формат конкурса:

• Вам предлагается решить 5 задач за 2 часа;
• Мы обеспечиваем обратную связь на протяжении всего конкурса;
• Задачи не будут засчитываться частично: то есть либо вы выполнили задание, либо нет (ACM-ICPC-style);
• Оценки будут присваиваться в динамике: в зависимости от количества пользователей, которые справились с проблемой, оценка - будет варьироваться от 100 до 1000;
• Помимо баллов, у каждого участника будет "пенальти", который будет учитываться при определении победителя

О системе пенальти:

• Пенальти вычисляется по следующей формуле: время, потраченное на выполнение последнего выполненного задания + "пенальти" за каждую решённую задачу. "Пенальти" для каждой решенной задачи равен log2 (no_of_submissions) * 5;
• Решения, которые не компилируются или не подходят для примеров тестовых случаев игнорируются;
• После того, как вы решили задачу и отослали результат, вы можете поэкспериментировать с решением, все последующие ответы уже не будут учитываться

Мы всегда рады Вам в наших уютных группах Facebook, VK и конечно в Twitter.

Hello, Codeforces!

The first round of Romania's IOI 2017 Selection Contests took place a week ago. CS Academy will host the online mirror on Sunday, 14/May/2017 09:00:00 (UTC). You will have to solve 3 problems in 5 hours. The statements will be available in English and Romanian.

Update: The round will be unrated because of the overlap with Russian Code Cup.

Contest format:

• You will have to solve 3 tasks in 5 hours.
• There will be full feedback throughout the entire contest.
• The tasks will have partial scoring. The maximum score for each problem will be 100 points.
• There will be no tie breaker, so two users having the same total score at the end of the contest will share the same place in the standings.

Support for countries

In the account settings you can now choose your country. We've also added country filters to the contest scoreboard.

If you find any bugs please email us at contact@csacademy.com

Don't forget to like us on Facebook, VK and follow us on Twitter.