40 минут, чтобы избежать пересечения с раундом на CSAcademy.** **UPD.**
Контест закончен, that the round has been moved 40 minutes later to avoid clashing with CSAcademy
Round.** **UPD, **Note that the round has been moved 40 minutes later to avoid clashing with
CSAcademy Round.**, **Обратите внимание, раунд перенесен на 40 минут, чтобы избежать пересечения с
раундом наCSAcademy.**
Rating changes for last rounds are temporarily rolled back. They will be returned soon.
→ Pay attention
→ Streams
→ Top rated
| # | User | Rating |
|---|---|---|
| 1 | jiangly | 3640 |
| 2 | Benq | 3593 |
| 3 | tourist | 3572 |
| 4 | orzdevinwang | 3561 |
| 5 | cnnfls_csy | 3539 |
| 6 | ecnerwala | 3534 |
| 7 | Radewoosh | 3532 |
| 8 | gyh20 | 3447 |
| 9 | Rebelz | 3409 |
| 10 | Geothermal | 3408 |
→ Top contributors
| # | User | Contrib. |
|---|---|---|
| 1 | maomao90 | 174 |
| 2 | awoo | 164 |
| 3 | adamant | 163 |
| 4 | TheScrasse | 159 |
| 5 | nor | 158 |
| 6 | maroonrk | 156 |
| 7 | -is-this-fft- | 151 |
| 8 | SecondThread | 147 |
| 9 | orz | 146 |
| 10 | pajenegod | 145 |
→ Find user
→ Recent actions
You can use several words in query to find by all of them at the same time. In addition, if you are lucky search understands word forms and some synonyms. It supports search by title and author. Examples:
305— search for 305, most probably it will find blogs about the Round 305andrew stankevich contests— search for words "andrew", "stankevich" and "contests" at the same timeuser:mikemirzayanov title:testlib— search containing "testlib" in title by MikeMirzayanov"vk cup"— use quotes to find phrase as istitle:educational— search in title
Results
1.
Codeforces Round #461 (Div. 2) _Привет, Codeforces! Давно не виделись :D_
Codeforces Round #461 состоится [в среду в 20:15 по московскому времени](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Codeforces+Round+%23461+%28Div.+2%29&iso=20180207T2015&p1=352&ah=2). Обратите внимание, что раунд чуть позже, чем обычно.
Раунд будет **рейтинговым** для участников из второго дивизиона. Первый дивизион тоже приветствуется, но вне конкурса :)
Спасибо Коле ([user:KAN, 2018-02-04]) за координацию раунда, Грише ([user:gritukan, 2018-02-04]), Олегу ([user:x3n, 2018-02-04]), АмирРезе ([user:Arpa, 2018-02-04]) и Сене ([user:senek_k, 2018-02-04]) за тестирование и, конечно, Майку ([user:MikeMirzayanov, 2018-01-01]) за Codeforces и Polygon.
Отдельная благодарность отправляется Диме ([user:mitterr1999, 2018-02-04]) и Камилю ([user:pseuda, 2018-02-04]) за идею одной из задач.
В этом раунде вы будете помогать игривому монстрику Импу. Не пугайтесь, условия будут короткими!
Announcement of Codeforces Round 461 (Div. 2)
2.
Новая он-лайн платформа — csacademy.com Привет, Codeforces!
Мы предлагаем вашему вниманию новую платформу на [csacademy.com](http://csacademy.com). Наш проект ориентирован на онлайн-образование. Мы разработали принципиально новую площадку для соревнований по программированию.
Наш первый контест состоялся в январе (IOI-style) с заданиями средней сложности, вы можете найти их в нашем [архиве](https://csacademy.com/contest/arhiva/). Для этого надо зарегистрироваться, используя ваш действующий e-mail. Вы также можете войти с помощью Facebook или Google+. После регистрации, вы можете подключиться к своему аккаунту на Codeforces [здесь](https://csacademy.com/accounts/profile/). Мы уже зарезервировали для вас все имена юзеров с сайта ;). Подключившись один раз, за вами закрепляется имя юзера с Codeforces или вы можете выбрать любое другое, на ваше усмотрение.
Наш [второй раунд](https://csacademy.com/contest/beta-round-2/) состоится в [пятницу, 04.03.2016 в 20:00 (MSK)](http://www.timeanddate.com/worldclock/fixedtime.html?m...
csacademy, 20:00 (MSK)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CSAcademy
+Beta+Round+2&iso, , Mar/04/2016 17:00
(UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CSAcademy
+Beta+Round, /fixedtime.html?msg=CSAcademy+Beta+Round+2&iso=20160304T17&p1=1440). If you
want to take part in this round you, ?msg=CSAcademy+Beta+Round+2&iso=20160304T20&p1=166&ah=2&am=30). Если вы хотите
принять участие в
3.
A bit more of general ideas Hi everyone!
Here's another collection of [little tricks](https://codeforces.com/blog/entry/100910) and [general ideas](https://codeforces.com/blog/entry/48417) that might make your life better (or maybe worse).
Most of them are somewhat well-known, but perhaps would still be useful to someone.
[cut]<hr>
1<!---->. **Evaluating polynomial modulo small prime $p$**. Given a polynomial $q(x)$, it may be evaluated in all possible $a \in \mathbb Z_p$ in $O(p \log p)$. To do this, compute $q(0)$ separately and use [chirp Z-transform](https://codeforces.com/blog/entry/83532) to compute $q(g^0), q(g^1), \dots, q(g^{p-2})$, where $g$ is a primitive root modulo $p$.
_This method can be used to solve [problem:1054H]._
2<!---->. **Generalized Euler theorem**. Let $a$ be a number, not necessarily co-prime with $m$, and $k > \log_2 m$. Then
$$
a^k \equiv a^{\phi(m) + k \mod \phi(m)} \pmod m,
$$
where $\phi(m)$ is Euler's totient. This follows from the Chinese remainder theor...
_The method was used in [CSAcademy — Divisible
Matching](https://csacademy.com/contest/round
4.
CSAcademy Round #9 + prizes Привет, Codeforces!
Приглашаем поучаствовать в следующем контесте [csacademy](https://csacademy.com). [Раунд №9](https://csacademy.com/contest/round-9/) пройдёт во вторник, [26 июля 2016, начало в 19:00 (МСК)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+9&iso=20160726T16&p1=1440&ah=2&am=30). Я являюсь одним из авторов задач этого раунда вместе с [user:mgch,2016-07-25] и командой CS Academy. Раунд с призами! Вот как они распределяются:
- Первое место: $125
- Второе место: $100
- Третье место: $75
- Четвертое и пятое место: $50
- Еще два специальных приза, каждый по $50. Критерий для специальных призов пока не выбран, он будет опубликован после контеста.
Задачи раунда также будут переведены на русский язык. Благодарим [user:Yury_Bandarchuk,2016-07-25] за проделанную работу по переводу!
#### Формат соревнования:
- Будут предложены 7 задач на 2 часа 30 минут.
- Во время контеста задачи будут тестироваться сразу на всех тестах....
CSAcademy Round #9 + prizes, Hello, Codeforces! I would like to invite you to participate in a new [csacademy
](https, I would like to invite you to participate in a new [csacademy
](https://csacademy.com) contest, Привет, Codeforces! Приглашаем поучаствовать в следующем контесте [csacademy
](https, Приглашаем поучаствовать в следующем контесте [csacademy
](https://csacademy.com). [Раунд №9](https
5.
Will competitive programming ever become a real sport? I always was dreaming that one day competitive programming will become a real sport, not just activity for a small group of participants. Why? Because I don't really like working and my tries to do some science were totally unsuccessful. It would be cool to live just by doing what you like. Very childish, I know.
But this blog is not about if competitive programming is important or are there any ways to make it interesting to watch to wider audience. I am just trying to understand, is it currently moving toward real sport or away from it? And I get some mixed signals about that:
Bad signals:
- Big onsites (like GCJ or TCO) seem to cut the number of participants and the amount of prizes.
- Some onsite-finals are turning to online-finals. For example, several years ago we had Russian Code Cup onsite in Russia, currently RCC Finals is online.
- Some big companies are turning away from sport programming (IBM is stopping sponsorship of ACM ICPC).
Good signals:
- Some ne...
participants) or csacademy.
6.
CHelper 4.4 I would really appreciate any new ideas of what new features to add
I would also appreciate donations: [Yandex.Money](https://money.yandex.ru/embed/shop.xml?account=410011732687384&quickpay=shop&payment-type-choice=on&writer=seller&targets=CHelper&targets-hint=&default-sum=100&button-text=03&successURL=), [PayPal](https://www.paypal.me/CHelper)
Seems like no one tried beta verion — I would really appreciate feedback
**4.4.3b3**
- All supported sites are updated
- New Google Code Jam is now supported
- You can now inline any file (feature best used for DCJ, which is not here this year, but I hope will return)
------
**4.4.1b2**
Support for interactive tasks added. By default you would interact using user input, but you can write your own interractor
------
**4.3.1**
Task format is changes to JSON. I would recomment backing up your project before updating
------
**4.2.2**
- Critical bug fix
- CHelper Beta is no longer supported. You can sel...
- Added parsing for AtCoder and CSAcademy - Fixed parsing for HackerRank -
Fixed enums in, CSAcademy - Fixed parsing for HackerRank - Fixed enums in switches -----
**4.1.3** - Various
7.
Round #13 — Contest with prizes + Platform changes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #13](https://csacademy.com/contest/round-13/) will take place on [Thursday, 27/Oct/2016 16:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2313&iso=20161027T16&p1=1440&ah=2&am=30). If you want to take part in this round you need to [register](https://csacademy.com/contest/round-13/) before the contest begins. Just like the [previous rounds](https://csacademy.com/contests/), this will be a Div1 + Div2, with **7** tasks of varied difficulty that need to be solved in **2** hours and **30** minutes. We are honoured to have [user:josdas,2016-10-25], [user:reality,2016-10-25] and [user:atatomir,2016-10-25] as problem setters.
We'd also like to thank [user:Yury_Bandarchuk,2016-10-25] for translating the statements in Russian.
This round is going to have some money prizes, as follows:
- First place: 125$
- Second ...
csacademy
8.
Is there any site for CodeChef virtual contests? Hi!
I like doing virtual contests. As it stands, I am quickly running out of contests (especially non-ancient ones) on Codeforces, Atcoder and CSAcademy. So, CodeChef would be the next logical place.
However, it seems that there is no option to do that on CodeChef. Since there are always new blogs about tools for competitive programming, I was wondering if someone had already made this or if someone knows of a service like this.
Some things I have looked into:
- **vjudge** doesn't really fit the bill, it seems that it is intended more as a "create cross-platform mashups" type of thing. My issues:
- - You need to manually create the contest unless someone else has already done it.
- - Can't look at "the number of people who solved the problem up to this point in time" — this part is important to me.
- - Can't look at "scoreboard at this point in time" — this part is less important.
- **[This project](https://discuss.codechef.com/t/codechef-virtual-contests-ar...
-ancient ones) on Codeforces, Atcoder and CSAcademy. So, CodeChef would be the
next logical place.
9.
Round #38 with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #38](https://csacademy.com/contest/round-38/) will take place on [Wednesday, 19/July/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2338&iso=20170719T15&p1=1440&ah=2&am=30). 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 [user:tourist,2017-07-17] 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$
1. Second place: 50$
1. 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 [user:Errichto,2017-07-18].
#### Contest format:
- You will have to solve **8** tasks in **2** hours and **30** minutes.
...
csacademy
10.
Round #15 + Platform changes Привет, Codeforces!
Мы рады объявить об очередном раунде на [csacademy.com](http://csacademy.com). [Раунд #15](https://csacademy.com/contest/round-15/) пройдёт в [среду, 30.11.16 в 19:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2315&iso=20161130T16&p1=1440&ah=2&am=30). Если вы хотите принять участие в этом раунде, Вы должны [зарегестрироваться](https://csacademy.com/contest/round-15/) перед началом. Контест будет проведён как обычно, для Div1 + Div2, с **7** заданиями разной сложности, которые надо решить за **2** часа и **30** минут.
Мы рады представить вам авторов этого сета: [user:josdas,2016-11-29] и [user:bluemmb,2016-11-29].
А так же огромное спасибо [user:Yury_Bandarchuk,2016-11-30] за перевод заданий на русский язык.
#### 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 з...
csacademy
11.
Бета раунд #4 — csacademy.com Привет, Codeforces!
Мы рады сообщить, что готовы провести следующий раунд на [csacademy.com](http://csacademy.com). И снова мы хотели бы сказать спасибо за комментарии и отзывы. Мы улучшаем нашу платформу после каждого соревнования, благодаря вам и вместе с вами!
Наш [бета раунд #4](https://csacademy.com/contest/beta-round-4/) состоится во вторник, [26/04/2016 20.00 (по Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CSAcademy+Beta+Round+4&iso=20160426T16&p1=1440&ah=2). Если вы хотите принять участие в этом раунде, вам необходимо [зарегистрироваться](https://csacademy.com/contest/beta-round-4/) перед началом соревнования. Вы можете открыть чат для этого раунда [здесь](https://csacademy.com/contest/beta-round-4/) (требуется регистрация). Изначально, мы планировали создать две дивизии: с разной сложностью заданий, начиная с этого раунда. Но после более пристального взгляда на рейтинги мы решили, что ещё слишком рано делить наших пользователей на подкатегории.
####...
csacademy, 16:00 (UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CSAcademy
+Beta+Round+4&iso, 20.00 (по Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=
CSAcademy+Beta+Round+4&iso, /26/2016 16:00 (UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=
CSAcademy+Beta+Round+4, ://www.timeanddate.com/worldclock/fixedtime.html?msg=CSAcademy
+Beta+Round+4&iso=20160426T16&p1=1440&ah=2
12.
Round #18 Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый контест на [csacademy.com](http://csacademy.com). [Round #18](https://csacademy.com/contest/round-18/) состоится в [воскресенье, 12.02.2017 в 21.30 (Мск)] (https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2318&iso=20170212T1830&p1=1440&ah=2&am=30). Если Вы хотите принять участие в этом раунде, Вам необходимо [зарегистрироваться](https://csacademy.com/contest/round-18/) перед началом соревнования. Раунд создан для обеих девизий ( Div1 + Div2), с **8** заданиями различной сложности, которые надо решить за **2** часа и **30** минут.
Мы горды работать с [user:desert97,2017-02-10] как с автором задач для этого раунда.
#### Формат конкурса:
- Вам перелагается решить **8** задач за **2** часа и **30** минут.
- 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 буду...
csacademy
13.
Solving problems on first sight + streaming _TL;DR I am thinking of holding a series of livestreams on youtube/twitch of me solving problems without having seen them beforehand. I want to highlight how to approach a medium-hard programming task when you are faced one. I want this to be a social and chill environment. Your ideas/feedback would be greatly appreciated._
TS;WR
------------------
Hello guys! I have been doing competitive programming for a while, and lately I have been thinking about how I have developed myself during the past years, and what is different between how I used to approach problems in the beginning and how I do it nowadays. I was thinking that it would be a pretty nice idea to give back my thoughts to the community.
What I was thinking about is recording some videos or streaming myself solving some competitive programming tasks that I haven't seen before. The inspiration for this idea came from a friend (teammate) of mine who wanted to do this quite some time ago, in order to train for ICPC. The...
, CSAcademy, Kattis, Infoarena, and others. They can be either ICPC style
(preferred) or IOI style. Difficuly
14.
Beta Round #8 — csacademy.com Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый раунд на [csacademy.com](http://csacademy.com). Наш [Бета раунд #8](https://csacademy.com/contest/beta-round-8/) пройдёт в [Субботу, 02.07.2016 в 12:00 (Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Beta+Round+%238&iso=20160702T16&p1=1440&ah=2). Если вы хотите принять участие в этом раунде, вам необходимо [зарегестрироваться](https://csacademy.com/contest/beta-round-8/) перед началом соревнования. Как и в [предыдущих раундах](https://csacademy.com/contests/), будет две дивизии ( Div1 + Div2), с **7** заданиями различной сложности. Благодаря вашим отзывам и комментариям, мы решили немного изменить формат, добавив дополнительных несложных задач. Так что этот раунд будет состоять из 7 заданий разной сложности.
####Что изменилось на сайте с бета раунда #7:
- Мы изменили главную страницу, теперь вы сразу видите чат, последние записи в блогах, расписание будущих контестов, а так же топ-ли...
csacademy
15.
Round #24 Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый раунд на [csacademy.com](http://csacademy.com). [Раунд #24](https://csacademy.com/contest/round-24/) состоится во [вторник, 11 апреля 2017 в 18:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2324&iso=20170411T15&p1=1440&ah=2). Если вы хотите принять участие в этом раунде, Вам необходимо [зарегистрироваться](https://csacademy.com/contest/round-24/) перед началом соревнования. Раунд разработан с учётом участия обоих дивизионов ( Div1 + Div2), с **7** заданиями различной сложности, которые Вам предлагается решить за **2** часа.
Мы рады представить [user:Arterm,2017-04-10] 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 п...
csacademy
16.
Round #35 with prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #35](https://csacademy.com/contest/round-35/) will take place on [Wednesday, 28/June/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2335&iso=20170628T15&p1=1440&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/round-35/) 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 [user:geniucos,2017-06-27] 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$
1. Second place: 50$
1. 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.
- ...
csacademy
17.
Beta Round #3 — csacademy.com Привет, Codeforces!
Мы рады сообщить, что через два дня стартует новый бета раунд на [csacademy.com](https://csacademy.com/). Сразу же хотели поблагодарить Вас за отклики, которые Вы оставляли. Спасибо огромное, ребят! Вы даёте нам шанс стать лучше:)
Наш [бета-раунд #3](https://csacademy.com/contest/beta-round-3/) состоится во [вторник, 22.03.2016 в 20:00 (мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=Beta+Round+%233&iso=20160322T20&p1=166&ah=2). Если Вы хотите принять участие в этом раунде, Вам необходимо [зарегистрироваться](https://csacademy.com/contest/beta-round-3/) перед началом соревнования. Как и в предыдущем туре, уровень сложности будет средним (похожим на codeforces Div. 2)
#### Формат состязания не изменился:
- Вам предлагается решить 5 задач за 2 часа.
- Вы будете видеть ваш результат в режиме он-лайн, сразу после решения проблемы в таблице результатов;
- Задачи не будут засчитываться частично: то есть либо вы выполнили задание, либо нет (ACM...
csacademy
18.
Junior Challenge 2017 Day 1 + Round #45 (Div. 1.5) 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](http://ejoi.org/).
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](https://csacademy.com/contest/junior-challenge-2017-day-1) takes place on [Sunday, September/03/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Junior+Challenge+2017+Day+1&iso=20170903T15&p1=1440&ah=4).
#### 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 w...
csacademy
19.
Round #20 (Div. 2) + Platform Redesign Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый раунд на [csacademy.com](http://csacademy.com). [Раунд #20](https://csacademy.com/contest/round-20/) состоится в [вторник, 07.03.2017 19:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2320&iso=20170307T16&p1=%3A&ah=2). Этот раунд рассчитан на Div2, это означает что изменение рейтинга коснётся только пользователей с рейтингом ниже 1600, 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](https://csacademy.com/contest/round-20/) перед началом. Так как раунд ориентирован на Div. 2, он будет состоять из **5** заданий более доступной сложности.
#### Формат контеста:
- Вам предлагается решить **5** задач за **2** часа.
- Мы обеспечиваем обратную связь на протяжении всего конкурса.
- Задачи не будут засчитываться частично: то есть либ...
csacademy
20.
Round #41 with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #41](https://csacademy.com/contest/round-41/) will take place on [Wednesday, 09/August/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2341&iso=20170809T15&p1=1440&ah=2). 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 [user:legar,2017-08-07] 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$
1. Second place: 50$
1. 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).
...
csacademy
21.
Special Round #64 (Interactive only) with prizes Hello, Codeforces!
Once again, we've reached a round number that is a power of 2 at [csacademy.com](http://csacademy.com). In order to properly celebrate this, [Round #64](https://csacademy.com/contest/round-64/) will consist of interactive problems only. If you are not familiar with this type of problems on our platform, please read this [blogpost](https://csacademy.com/blog/introducing-interactive-problems/) before the contest.
The round will take place on [Wednesday, 10/January/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2364&iso=20180110T1505&p1=1440&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### Conte...
csacademy
22.
Round #16 (Interactive only) Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #16](https://csacademy.com/contest/round-16/) will take place on [Sunday, 11/Dec/2016 12:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2316+%28Interactive+only%29&iso=20161211T12&p1=1440&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/round-16/) before the contest begins.
This contest will be a Div1 + Div2, with **7** tasks of varied difficulty that need to be solved in **2** hours. ALL 7 problems will be interactive. Check out our [blog post](https://csacademy.com/blog/#introducing-interactive-problems) for more details about interactive problems.
Many thanks to [user:Yury_Bandarchuk,2016-11-30] for translating the problem statements in Russian.
#### Contest format:
- You will have to solve **7** tasks in **2** hours.
- There will be full feedback t...
csacademy
23.
Round #21 Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый раунд на [csacademy.com](http://csacademy.com). [Раунд #21](https://csacademy.com/contest/round-21/) состоится в [Воскресенье, 19.03.2017 18:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2321&iso=20170319T15&p1=1440&ah=2). Если Вы хотите принять участие в это раунде, Вам необходимо [зарегестрироваться](https://csacademy.com/contest/round-21/) до его начала. Предполагается участие двух дивизионов (Div1 + Div2), с **7** задания различной сложности Вам предлагается решить за **2** часа.
Мы рады представить [user:desert97,2017-03-17] как одного из создателей задач.
#### Больше контестов, которые Вы теперь не пропустите
Наконец-то наша площадка достигла определённого уровня развития, что позволяет нам организовывать больше контестов сейчас и в будущем. Мы создали [event](https://www.facebook.com/events/274490292973861/) на Facebook. Присоединяйтесь, и Вы будете информиров...
csacademy
24.
30 day challenge Hello everyone !
I'm fourth year software engineering student.I've been doing CP for three years .I learned many algorithms and I solved many problems but the problem is that I cannot do my best during contests for that I'm going to set myself a 30 day challenge :making virtual participation every day in a contest and upsolve all unsolved problems.
so if any one remember a good round (quality of problems,gap of difficulty between problems)please share it with me.
I'll update the blog every day to post my rating in the contest and let's see if this challenge gonna make me a
junior tourist ^__^.
first contest:[round 422](https://codeforces.com/contest/822)
[rank](https://codeforces.com/contest/822/standings/participant/31810110#p31810110):1368
second contest: [round 480](https://codeforces.com/contest/980) [rank](https://codeforces.com/contest/980/standings/participant/31837825#p31837825):1058
third contest: [round 353](https://codeforces.com/contest/675) rank:[1398...
Note:I'm not counting csacademy Vc's ^__^
25.
Раунд #17 (Div. 2) Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый раунд на [csacademy.com](http://csacademy.com). [Раунд #17](https://csacademy.com/contest/round-17/) состоится в [четверг, 26/01/2017 в 19:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2317&iso=20170126T16&p1=%3A&ah=2). Этот раунд рассчитан на Div2, это означает что изменение рейтинга коснётся только пользователей с рейтингом ниже 1600, 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](https://csacademy.com/contest/round-17/) перед началом. Так как раунд ориентирован на Div. 2, он будет состоять из **5** заданий более доступной сложности.
#### Формат контеста:
- Вам предлагается решить **5** задач за **2** часа.
- Мы обеспечиваем обратную связь на протяжении всего конкурса.
- Задачи не будут засчитываться частично: то есть ...
csacademy
26.
Round #56 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #56](https://csacademy.com/contest/round-56/) will take place on [Wednesday, 08/November/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2356&iso=20171108T1505&p1=1440&ah=2). 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 [user:reality,2017-11-07] as a problem author.
#### 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.
...
csacademy
27.
Round #32 with prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #32](https://csacademy.com/contest/round-32/) will take place on [Thursday, 08/June/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2332&iso=20170608T15&p1=1440&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/round-32/) 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$
1. Second place: 50$
1. 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 an...
csacademy
28.
Round #10 + prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #10](https://csacademy.com/contest/round-10/) will take place on [Saturday, Aug/06/2016 11:00 (UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+10&iso=20160806T11&p1=1440&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/round-10/) before the contest begins. Just like the [previous rounds](https://csacademy.com/contests/), this will be a Div1 + Div2, with 7 tasks of varied difficulty. We are honoured to have [user:Yury_Bandarchuk,2016-08-06] as a problem setter.
This round is going to have some money prizes, as follows:
- First place: 125$
- Second place: 100$
- Third place: 75$
- Fourth and fifth place: 50$
- Two more special prizes, each consisting of 50$. The criteria for the special prizes is not chosen yet, but we will make it public after the contest.
Also...
csacademy
29.
Round #31 Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #31](https://csacademy.com/contest/round-31/) will take place on [Tuesday, 30/May/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2331&iso=20170530T15&p1=1440&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/round-31/) 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.
We are glad to have [user:lewin,2017-05-29] as problem setter.
#### 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 use...
csacademy
30.
Round #72 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #72](https://csacademy.com/contest/round-72/) will take place on [Wednesday, 07/March/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2372&iso=20180307T1505&p1=1440&ah=2). 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 [user:ko_osaga,2018-03-06] as a problem setter.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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...
csacademy
31.
Раунд #14 (Div. 2) Привет, Codeforces!
Мы рады сообщить, что готовы провести новый раунд на [csacademy.com](http://csacademy.com). [Раунд #14](https://csacademy.com/contest/round-14/) состоится в [понедельник, 14/11/2016 в 20:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2314&iso=20161114T17&p1=1440&ah=2). Раунд создан для Div2, это означает что изменение рейтинга коснётся только пользователей с рейтингом ниже 1550, а также пользователей без рейтинга. Юзеры с высоким рейтингом могут принять участие неофициально.
Огромное спасибо [user:Yury_Bandarchuk,2016-11-13] за перевод заданий на русский язык!
Если вы хотите принять участие в этом раунде, Вам необходимо [зарегистрироваться](https://csacademy.com/contest/round-14/) перед началом соревнования. Так как раунд создан для Div2., он будет состоять из **5** задач средней сложности.
#### Формат конкурса:
- Вам предлагается решить **5** задач за **2** часа.
- Мы обеспечиваем обратную связь на протяжении...
csacademy
32.
Platform Changes Hello Codeforces!
It's been a while since our last blog post. We've been working hard on several features that we are happy to share with you.
#### Gmail spam
First of all, we suspect some of our users using gmail didn't get our last emails, as they were considered spam. If you wish to further receive emails from us please check your spam folder and move the emails to inbox.
#### Enforced templates
All the interview problems, except for those that were used in CSA rounds, now support enforced templates in C++, Java, Python and Javascript. Basically, the template takes care of reading the input, calling the function you need to implement and printing the result. You can concentrate on solving the problem, not having to worry about all the messy details.
#### Interviews
This new...
csacademy
33.
Beta Round #6 — csacademy.com Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). Our [Beta Round #6](https://csacademy.com/contest/beta-round-6/) will take place on [Tuesday, May/31/2016 16:00 (UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Beta+Round+6&iso=20160531T16&p1=%3A&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/beta-round-6/) before the contest begins. Just like the [previous two rounds](https://csacademy.com/contests/), this will be a Div1 + Div2, with 6 tasks of varied difficulty.
#### Platform changes since Beta Round #5:
- We added virtual contests. Now you can simulate a past round easily with a single click in the [contests page](https://csacademy.com/contests/).
- Contestants source code is now public. Go to any scoreboard and click on a check mark.
- The online editor now support an "Open file" button. No more copy paste when trying to...
csacademy
34.
Round #27 Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #27](https://csacademy.com/contest/round-27/) will take place on [Wednesday, 03/May/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2327&iso=20170503T15&p1=1440&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/round-27/) 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.
One of the problems is going to be interactive. You can read more about interactive problems [here](https://csacademy.com/blog/#introducing-interactive-problems).
#### 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...
csacademy
35.
Round #25 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #25](https://csacademy.com/contest/round-25/) will take place on [Tuesday, April/18/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2325&iso=20170418T15&p1=1440&ah=2). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1600. 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](https://csacademy.com/contest/round-25/) 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, [user:wefgef,2017-04-17]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. Th...
csacademy
36.
Round #12 (Div. 2) Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый раунд на [csacademy.com](http://csacademy.com). Наш бета [раунд #12](https://csacademy.com/contest/round-12/) состоится в [четверг, 15.09.2016 в 19:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+12&iso=20160915T16&p1=%3A&ah=2). Этот раунд для Div2, это означает что изменение рейтинга коснётся только пользователей с рейтингом ниже 1550, а также пользователей без рейтинга. Юзеры с высоким рейтингом могут принять участие неофициально.
Если вы хотите принять участие в этом раунде, вам необходимо [зарегистрироваться](https://csacademy.com/contest/round-12/) перед началом соревнования. В отличие от [предыдущих раундов](https://csacademy.com/contests/), раунд создан для Div2. Он будет состоять из **5** задач более доступной сложности.
Огромное спасибо [user:Yury_Bandarchuk,2016-09-14] за перевод задач на русский язык!
#### Изменения платформы с бета раунда #11:
- Проведена ...
csacademy
37.
Round #34 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #34](https://csacademy.com/contest/round-34/) will take place on [Wednesday, June/21/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2334&iso=20170621T15&p1=1440&ah=2). 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](https://csacademy.com/contest/round-34/) 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, [user:wefgef,2017-06-20]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minute...
csacademy
38.
Round #23 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #23](https://csacademy.com/contest/round-23/) will take place on [Tuesday, April/04/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2323&iso=20170404T15&p1=1440&ah=2). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1600. 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](https://csacademy.com/contest/round-23/) 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, [user:wefgef,2017-04-02]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. Th...
csacademy
39.
[Insight] Number of Topological Orderings of a Directed Tree I was checking [this](https://csacademy.com/contest/round-11/task/connected-tree-subgraphs/statement/) problem on csacademy, and I came up with the dp combinatorics solution to calculate the number of topological orderings of a directed tree with a fixed root.
First, let me explain this solution. Let's root the tree at node $1$ and calculate $sz_v$ = size of the subtree rooted at $v$. Let $dp_v$ be the number of possible topological orderings of the subtree rooted at $v$. To calculate $dp_v$, let's imagine $v$ has only two children: $x$ and $y$. We can see quite easily that $dp_v = dp_x * dp_y * {sz_x+sz_y \choose sz_x}$. That's because any valid topological ordering of the subtree of $v$ will begin with $v$ itself and then $sz_x+sz_y$ nodes, and because the nodes of $x$'s and $y$'s subtrees are independent, all possible combinations between them are possible. So, we will choose $sz_x$ spots of the $sz_x+sz_y$ spots and put in them all the nodes form $x$'s subtree and put on the res...
/statement/) problem on csacademy, and I came up with the dp combinatorics
solution to calculate the number
40.
Beta Round #7 — csacademy.com Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый раунд на [csacademy.com](http://csacademy.com). Наш [бета раунд #7](https://csacademy.com/contest/beta-round-7/) состоится в воскресенье, [12.06.2016 в 12:00 (Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Beta+Round+7&iso=20160612T09&p1=%3A&ah=2). Если вы хотите принять участие в этом раунде, вам необходимо [зарегистрироваться](https://csacademy.com/contest/beta-round-7/) перед началом соревнования. Как и в [предыдущих турах](https://csacademy.com/contests/), будут две дивизии ( Div1 + Div2), с 6 заданиями различной сложности.
####Что изменилось на сайте с бета раунда #6:
- Мы добавили новый раздел с комментариями ко всем задачам.
- Мы добавили новый раздел "решения" во вкладки к каждой задаче
- Мы начали работать над корректировкой описаний, а так же добавили коды решения к задачам.
####Формат конкурса:
- Вам предлагается решить **6** задач за **2** часа.
- Мы обеспечивае...
csacademy
41.
Бета Раунд #5 — csacademy.com Привет, Codeforces!
Мы рады сообщить, что мы собираемся провести новый конкурс на [csacademy.com](https://csacademy.com). Отныне мы будем иметь контесты каждые две недели. Итак, поехали:
[Бета раунд #5](https://csacademy.com/contest/beta-round-5/) состоится в [понедельник, 09/05/2016 в 19:00 (по Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CSAcademy+Beta+Round+5&iso=20160509T16&p1=1440&ah=2). Если вы хотите принять участие в этом раунде, вам необходимо [зарегистрироваться](https://csacademy.com/contest/beta-round-5/) перед началом соревнования. Как и в [предыдущем туре](https://csacademy.com/contest/beta-round-4/), дивизии будут объеденены ( Div1 + Div2), предлагается 6 заданий различной сложности.
####Что изменилось на сайте с бета раунда #4:
- **Важно**: когда раунд начнётся, страница будет автоматически загружать задачи и показывать первую проблему. Пожалуйста, не обновляйте страницу, так как это будет перегружать сервер.
- Мы исправили кнопки редактора...
csacademy, в 19:00 (по Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=
CSAcademy+Beta+Round+5, , May/09/2016 16:00
(UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CSAcademy+Beta, /2016 16:00 (UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=
CSAcademy+Beta+Round+5&iso, :00 (по Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CSAcademy
+Beta+Round+5&iso
42.
Round #78 (Div. 1 + Div. 2) with prizes, based on Romanian Olympiad IOI selection camp Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #78](https://csacademy.com/contest/round-78/) will take place on [Wednesday, 25 April 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2378&iso=20180425T1505&p1=1440&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
**Some of the problems will be based on a contest from Romanian Olympiad IOI selection camp.**
#### Facebook event
We recently created a new Facebook event. If you choose "Interested" [here](https://www.facebook.com/events/595041154190631/), you will be notified before each round we organise from now on.
#### 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-st...
csacademy
43.
Раунд #19 (Div. 2) Привет, Codeforces!
Мы рады сообщить, что собираемся провести новый раунд на [csacademy.com](http://csacademy.com). [Раунд #19](https://csacademy.com/contest/round-19/) состоится в [пятницу, 24/02/2017 в 19:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2319&iso=20170224T16&p1=%3A&ah=2). Этот раунд рассчитан на Div2, это означает что изменение рейтинга коснётся только пользователей с рейтингом ниже 1600, 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](https://csacademy.com/contest/round-19/) перед началом. Так как раунд ориентирован на Div. 2, он будет состоять из **5** заданий более доступной сложности.
#### Формат контеста:
- Вам предлагается решить **5** задач за **2** часа.
- Мы обеспечиваем обратную связь на протяжении всего конкурса.
- Задачи не будут засчитываться частично: то есть ли...
csacademy
44.
Interview Contest #1 Hello, Codeforces!
We are happy to announce that we're going to start a new series of contests at [csacademy.com](http://csacademy.com). If you are planning to interview for a software engineering position, the interview contests are a great place to hone your skills. We also think they are going to be challenging for regular algorithms enthusiasts.
[Interview Contest #1](https://csacademy.com/contest/interview-contest-1/) will take place on [Saturday, January/28/2017 16:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Interview+Contest+%231&iso=20170128T16&p1=%3A&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/interview-contest-1/) before the contest begins. You will have to solve **8** tasks of varied difficulty in **2** hours. The contest will also feature an interactive problem.
#### Contest format:
- There will be full feedback throughout the entire contest.
- Tasks will not have partial scoring, so...
csacademy
45.
Round #26 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #26](https://csacademy.com/contest/round-26/) will take place on [Tuesday, April/25/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2326&iso=20170425T15&p1=1440&ah=2). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1600. 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](https://csacademy.com/contest/round-26/) 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, [user:wefgef,2017-04-24]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. Th...
csacademy
46.
Round #33 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #33](https://csacademy.com/contest/round-33/) will take place on [Wednesday, June/14/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2333&iso=20170614T15&p1=1440&ah=2). 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](https://csacademy.com/contest/round-33/) 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, [user:wefgef,2017-06-13]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minute...
csacademy
47.
Round #28 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #28](https://csacademy.com/contest/round-28/) will take place on [Wednesday, May/10/2017 13:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2328&iso=20170510T13&p1=1440&ah=2). 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](https://csacademy.com/contest/round-28/) 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, [user:wefgef,2017-05-08]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes...
csacademy
48.
Round #9 contest analysis and winners Hello Codeforces!
The latest [csacademy](https://csacademy.com/) contest, [Round #9](https://csacademy.com/contest/round-9/) took place on Tuesday, July/26/2016. First of all congratulations to the winners:
1. [user:FatalEagle,2016-07-28]
1. [user:uwi,2016-07-28]
1. [user:anta,2016-07-28]
1. [user:tourist,2016-07-28]
1. [user:I_Love_Tanya_Romanova,2016-07-28]
In addition to the top 5 finishers, we initially announced that we're going to have 2 more special prizes. Meanwhile we changed our mind and decided to have **3** special prizes:
1. The first special prize is awarded to [user:snuke,2016-07-28], for being the first one to solve [Sum of Squares](https://csacademy.com/contest/round-9/#task/sum-of-squares), which proved to be the second hardest problem after [Jetpack](https://csacademy.com/contest/round-9/#task/jetpack).
1. The second special prize is awarded to [user:Kostroma,2016-07-28] for a correct solution at [Jetpack](https://csacademy.com/contest/round-9/#task/...
csacademy
49.
Round #22 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #22](https://csacademy.com/contest/round-22/) will take place on [Monday, March/27/2017 14:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2322&iso=20170327T14&p1=1440&ah=2). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1600. 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](https://csacademy.com/contest/round-22/) 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, [user:wefgef,2017-03-26]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. The...
csacademy
50.
Round #30 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #30](https://csacademy.com/contest/round-30/) will take place on [Wednesday, May/24/2017 12:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2330&iso=20170524T12&p1=1440&ah=2). 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](https://csacademy.com/contest/round-30/) 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, [user:wefgef,2017-05-22]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes...
csacademy
51.
Junior Challenge 2017 Day 2 + Round #46 (Div. 1.5) 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](http://codeforces.com/blog/entry/54230).
The [second round](https://csacademy.com/contest/junior-challenge-2017-day-2) takes place on [Tuesday, September/05/2017 11:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Junior+Challenge+2017+Day+2&iso=20170905T11&p1=1440&ah=4), 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 [user:Andrei1998,2017-09-01], [user:bciobanu,2017-09-01], [user:tamionv,2017-09-01], [user:geniucos,2017-09-01] and [user...
csacademy
52.
Round #11 Contest with prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #11](https://csacademy.com/contest/round-11/) will take place today, [Monday, 22/Aug/2016 16:30 (UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+11&iso=20160822T1630&p1=1440&ah=2). If you want to take part in this round you need to [register](https://csacademy.com/contest/round-11/) before the contest begins. Just like the [previous rounds](https://csacademy.com/contests/), this will be a Div1 + Div2, with 7 tasks of varied difficulty. We are honoured to have [user:Alex7,2016-08-22] as a problem setter.
This round is going to have some money prizes, as follows:
- First place: 125$
- Second place: 100$
- Third place: 75$
- Fourth and fifth place: 50$
- Two more special prizes, each consisting of 50$. The criteria for the special prizes is not chosen yet, but we will make it public after the contest.
#### Conte...
csacademy
53.
Round #80 (Div. 1 + Div. 2) with prizes, based on Romanian Olympiad IOI selection camp Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #80](https://csacademy.com/contest/round-80/) will take place on [Wednesday, 23 May 15:05 (UTC).](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2380&iso=20180523T1505&p1=1440&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
**Some of the problems will be based on contests from Romanian Olympiad IOI selection camp.**
#### Facebook event
We recently created a new Facebook event. If you choose "Interested" [here](https://www.facebook.com/events/595041154190631/), you will be notified before each round we organise from now on.
#### 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-styl...
csacademy
54.
Round #29 (Div. 2) + Special Prizes Hello, Codeforces!
We are happy to announce that we're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #29](https://csacademy.com/contest/round-29/) will take place on [Wednesday, May/17/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2329&iso=20170517T15&p1=1440&ah=2). 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](https://csacademy.com/contest/round-29/) 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, [user:wefgef,2017-05-16]. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes...
csacademy
55.
Round #67 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #67](https://csacademy.com/contest/round-67/) will take place on [Wednesday, 31/January/2017 15:35 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2367&iso=20180131T1535&p1=1440&ah=2). 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 [user:khadaev,2018-01-30] as a problem setter again.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 c...
csacademy
56.
Round #75 (Div. 1 + Div. 2) with prizes, unusual day Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #75](https://csacademy.com/contest/round-75/) will take place on [Thursday, 05/April/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2375&iso=20180405T1505&p1=1440&ah=2). 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 [user:pb0207,2018-04-04] as a problem setter.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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-IC...
csacademy
57.
Round #82 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're glad to have [user:Salitanloo,2018-06-20] as a problem setter!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #82](https://csacademy.com/contest/round-82/) will take place on [Wednesday, June 20th, 15:05:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2382&iso=20180620T1505&p1=1440&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
#### Facebook event
We recently created a new Facebook event. If you choose "Interested" [here](https://www.facebook.com/events/595041154190631/), you will be notified before each round we organise from now on.
#### 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 hav...
csacademy
58.
Round #85 (Div. 1 + Div. 2) powered by BOI, unrated Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #85](https://csacademy.com/contest/round-85/) will take place on [Wednesday, August 1st, 15:05:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2385&iso=20180801T1505&p1=%3A&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
This contest is powered by the Balkan Olympiad in Informatics(BOI) meaning that the some of the problems are from BOI. Because of this, the round will be unrated. This does not change the fact that the CSA team is doing it's best to make sure that the contest will be great.
#### Facebook event
We recently created a new Facebook event. If you choose "Interested" [here](https://www.facebook.com/events/595041154190631/), you will be notified before each round we organise from now on.
#### Contest format:
- You will have to solve **7** tasks in **...
csacademy
59.
[Community Editorial] Codeforces Round #720 (Div.2) Problem D — Nastia Plays with a Tree Hello Codeforces!
Today was Codeforces Round #720 (Div.2), in which I solved problem D — Nastia Plays with a Tree. As I find my solution different from the solutions I heard of after the contest, I will explain it in detail in this blog post. I will note that you still might find value in reading this if you solved the problem, as my proposed solution also maintains at every stage the graph being a forest (i.e I don't create any cycles).
**The Solution**
<spoiler summary="Solution By FiveSixFiveFour">
Note that in this editorial, when I write *simple path*, I mean a simple path between two nodes without having extra edges going from any of the nodes that do not belong to that simple path, or simply a node not connected to anything (this will be clearer once we see drawings).
We should first note that bamboo is simply a tree that looks like a single line of connections (i.e a simple path).
We observe that given the sequence of moves the order we delete/link edge...
the optimal one) (in this editorial I cheat with [CSAcademy Graph
Editor](https://csacademy.com/app
60.
[Coder's Calendar] Chrome extension for Competitive Programming Hi all,
Coder's Calendar is a Chrome extension that I've made, which displays details of upcoming and ongoing coding competitions.
It currently lists contests on Codeforces, Topcoder, Hackerearth, Hackerrank, Codechef, CSAcademy, AtCoder & Kaggle.
Coder's Calendar is available for download at:
- Chrome Extension :
[https://chrome.google.com/webstore/detail/coders-calendar/bageaffklfkikjigoclfgengklfnidll][1]
**Firefox Users**: [https://github.com/nishanthvijayan/CoderCalendar-Extensions#firefox][4]
**Star the project on Github to show your support:**
[https://github.com/nishanthvijayan/CoderCalendar-Extensions][2]
[https://github.com/nishanthvijayan/CoderCalendar-API][3]
Please comment if you find any bug or if you don't like any feature.
 я решил вынести его в отдельный тред.
Есть много разных тестирующих систем, и во всех свои политики файлового ввода-вывода. Я встречал много разных: stdin+stdout, a.in/txt, input.txt, $problem.in/txt, где-то даже a.in+stdout. В последнее время, как мне показалось, хорошей практикой считается допускать стандартные потоки, и файловый ввод-вывод. Но предположим, что такого решения нет, и остановимся на первых двух: только файлы или только стандартный ввод-вывод. Что из этого, по-вашему, должна поддерживать тестирующая система?
Я приведу свои аргументы в пользу stdin/stdout.
1. Человек может написать минимальный работающий кусок кода, начав с пустого листа, проверить его работу из консоли и заслать в систему, потратив минимум времени. Есть разные кейсы. Топкодер, где код пишется в арене/на вебсайте; туда же сейчас присоденяются HackerRank, CSAcademy и т.д. Это и мой сегодняшний пример ...
пишется в арене/на вебсайте; туда же сейчас присоденяются HackerRank, CSAcademy
и т.д. Это и мой
62.
My 2018 Codejam adventure Introduction
------------------
This is the story of how I failed to qualify for round 2 to in the 2018 Google Codejam. Hopefully you find it interesting and learn some things you shouldn't do in Codejam.
Qualification Round
------------------
Qualification was fairly easy due to the ample time of 24 hours. I managed to solve everything correctly apart from the large dataset for the last question. I tried to see if anyone had done mathematical analysis of Madison Cube garden from Futuruma since that seemed closely related to the last question but to no avail.
Round 1A
------------------
The ideas to solve questions just did not come to me during this round. I only managed to solve the small set for question A.
What I learnt:
Eat a good breakfast before doing a competition in the morning.
Round 1B
------------------
I looked at question A and could not think of a correct approach. Then I looked at B and decided to work on it since it seemed simpler. I saw a th...
2. Be thankful for sites like csacademy that give you problems without stupid
stories about
63.
Koosaga Round #84 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're glad to have [user:koosaga,2018-07-18] as a problem setter!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #84](https://csacademy.com/contest/round-84/) will take place on [Wednesday, July 18th, 15:05:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2384&iso=20180718T1505&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
#### Facebook event
We recently created a new Facebook event. If you choose "Interested" [here](https://www.facebook.com/events/595041154190631/), you will be notified before each round we organise from now on.
#### 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 s...
csacademy
64.
IOI 2016 Training Round #1 — csacademy.com Hello, Codeforces!
As [IOI 2016](http://ioi2016.ru/) is around the corner, we decided to host a series of competitions in a format more similar to the Olympiad. We will use problems from past Romanian competitions. For this reason, the contests will be unrated.
[IOI 2016 Training Round #1](https://csacademy.com/contest/ioi-2016-training-round-1/) will take place on [Sunday, June/05/2016 09:00 (UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=IOI+2016+Training+Round+%231+-+csacademy.com&iso=20160605T09&p1=%3A&ah=4). This contest will have a medium difficulty, but we hope you'll find the tasks interesting. Don't forget to register in order to participate.
#### Contest format:
- You will have to solve 3 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 t...
csacademy
65.
Round #49 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #49](https://csacademy.com/contest/round-49/) will take place on [Wednesday, 20/September/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2349&iso=20170920T15&p1=1440&ah=2). 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 [user:zscoder,2017-09-19] as a problem author.
#### 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.
...
csacademy
66.
IOI 2016 Training Round #4 — csacademy.com Привет, Codeforces!
Мы продолжаем серию конкурсов, посвященных [IOI 2016](http://ioi2016.ru/) с [IOI 2016 Training Round #4](https://csacademy.com/contest/ioi-2016-training-round-4/). Мы снова будем использовать проблемы из прошлых румынских контестов. По этой причине, раунд будет нерейтинговым.
Соревнование будет проходить в [Субботу, 09.07.2016 14:00 (Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=IOI+2016+Training+Round+%234&iso=20160709T11&p1=1440&ah=3). Уровень сложности будет средним, похожим на [предыдущий раунд](https://csacademy.com/contests/). Не забудьте зарегистрироваться для участия.
#### Формат конкурса:
- Вам предлагается решить 3 задачи за 3 часа.
- Мы обеспечиваем обратную связь на протяжении всего контеста.
- Задания будут засчитываться частично. Максимальный балл за каждую задачу будет 100 баллов.
- Не будет системы штрафов, поэтому два пользователя, имеющие одинаковую сумму очков в конце конкурса, разделят одно место в турнирной таблице...
csacademy
67.
Balkan OI 2017 Day 1 online mirror Hello, Codeforces!
The 25th [Balkan Olympiad in Informatics](http://www.boi2017.md/) 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](https://csacademy.com/contest/balkan-oi-2017-day-1/) starts on [Tuesday, July 04, 11:00:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Balkan+OI+2017+Day+1+Online+Mirror&iso=20170704T11&p1=1440&ah=5), 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 p...
csacademy
68.
RMI 2017 Day 1 Online Mirror Hello, Codeforces!
The [Romanian Master of Informatics](http://rmi.lbi.ro/rmi_2017/index.php?id=home) is a yearly competition addressed to high school students and organised by the [Tudor Vianu](http://portal.lbi.ro/) highschool in Bucharest, Romania. The format of the contest is the one commonly found in olympiads.
**RMI** provides a great opportunity for young people to demonstrate their abilities in Informatics, to exchange knowledge and to enhance cross-cultural contacts in high-school education. Coming to RMI 2017, they will have opportunities to make new friends, to visit a friendly country, and to discover the culture of Romania.
[CS Academy](https://csacademy.com/) will host the online mirrors of both competition days. The [first contest](https://csacademy.com/contest/rmi-2017-day-1/) starts on [Thursday, October 05, 11:00:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=RMI+2017+Day+1&iso=20171005T11&p1=1440&ah=5), after the onsite competition ends. T...
csacademy
69.
Romanian IOI 2017 Selection #2 Hello, Codeforces!
[CS Academy](https://csacademy.com/) will host the online mirror of Romania's IOI 2017 Selection Contests. The first contest already took place on Saturday.
The [second round](https://csacademy.com/contest/romanian-ioi-2017-selection-2/) will take place tomorrow, [Monday, 08/May/2015 06:30:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Romanian+IOI+2017+Selection+%232&iso=20170508T0630&p1=1440&ah=5). The round will be rated for all users. You will have to solve **3** problems in **5** hours. The statements will be available in English and Romanian.
The third round will take place on Wednesday. As for the first round, we'll host the online mirror on Friday. Rounds 4, 5 and 6 will take place in a few weeks.
#### 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....
csacademy
70.
CsAcademy is back! After 6 months without contests, CsAcademy is finally back!
https://csacademy.com/contest/fii-code-2019-round-1
CsAcademy is back!, After 6 months without contests, CsAcademy is finally back!
71.
Round #39 (Div. 2) + Special Prizes Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #39](https://csacademy.com/contest/round-39/) will take place on [Wednesday, July/26/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2339&iso=20170726T15&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1675**.
#### Special prizes
This round will have 3 special prizes consisting of private coaching lessons with our contest coordinator, [user:wefgef,2017-07-25]. 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 num...
csacademy
72.
Round #36 (Div. 2) + Special Prizes Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #36](https://csacademy.com/contest/round-36/) will take place on [Wednesday, July/05/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2336&iso=20170705T15&p1=1440&ah=2). 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, [user:wefgef,2017-07-03]. 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 hav...
csacademy
73.
Round #44 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #44](https://csacademy.com/contest/round-44/) will take place on [Wednesday, August/30/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2344&iso=20170830T15&p1=1440&ah=2). 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 sol...
csacademy
74.
Round #52 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #52](https://csacademy.com/contest/round-52/) will take place on [Wednesday, 11/October/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2352&iso=20171011T1505&p1=1440&ah=2). 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 [user:HellKitsune,2017-10-10] as a problem author.
#### Contest format change
- The last problem will become visible only **20** minutes after the contest starts.
#### 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 b...
csacademy
75.
[CEOI 2017] Defeated by Mousetrap I tried to solve CEOI 2017 Day1 problem — Mousetrap today during the [user:csacademy,2017-07-20] mirror.
My idea is a bit different than what model solution does, but in the same time complexity $O(n log n)$.
I'll describe it briefly. First, let's assume we can freeze the mouse for a while and prepare the way for her. Let's calculate answer for this case and call it pathOnly. This is computed by the simple formula.
Now let's unfreeze the mouse. We will do binary search on answer — how many additional operations do we need now. Let's precalculate cost[] for each vertex x, meaning: how many additional operations if mouse gets to vertex x and stays there forever. Forever means in this case: until we prepare the rest of the graph for her.
Cost is computed by a simple recursive formula : cost[onPath] = 0 and cost[x] = cost[parent[x]] + degree(x) — 1 otherwise.
Now let's move to the last step of the solution. Assume we are at some step of binsearch checking ...
Thanks in advance. PS. How to link the submission on csacademy?
76.
Round #71 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #71](https://csacademy.com/contest/round-71/) will take place on [Wednesday, February/28/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2371&iso=20180228T1505&p1=%3A&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 th...
csacademy
77.
Round #61 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #61](https://csacademy.com/contest/round-61/) will take place on [Wednesday, 13/December/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2361&iso=20171213T1505&p1=1440&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 ...
csacademy
78.
Round #54 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #54](https://csacademy.com/contest/round-54/) will take place on [Wednesday, 25/October/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2354&iso=20171025T1505&p1=1440&ah=2). 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 [user:khadaev,2017-10-23] as a problem author.
#### 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.
...
csacademy
79.
IOI 2016 Training Round #3 — csacademy.com Здравствуйте, На Codeforces!
Мы продолжаем серию конкурсов, посвященных [IOI 2016](http://ioi2016.ru/) с [IOI 2016 Training Round #3](https://csacademy.com/contest/ioi-2016-training-round-3/). Мы снова будем использовать проблемы из прошлых румынских контестов. По этой причине, раунд будет нерейтинговым.
Соревнование будет проходить в [пятницу, 24.06.2016 в 17:00 Мск](http://www.timeanddate.com/worldclock/fixedtime.html?msg=IOI+2016+Training+Round+%233&iso=20160624T14&p1=%3A&ah=3). Уровень сложности будет средний, похожий на предыдущий раунд. Не забудьте зарегистрироваться для участия.
#### Формат конкурса:
- Вам предлагается решить 3 задачи за 3 часа.
- Мы обеспечиваем обратную связь на протяжении всего конкурса.
- Задания будут засчитываться частично. Максимальный балл за каждую задачу будет 100 очков.
- Не будет системы штрафов, поэтому два пользователя, имеющие одинаковую сумму очков в конце конкурса, разделят одно место в турнирной таблице.
Авторы задач для этог...
csacademy
80.
Romanian IOI 2017 Selection #3 Hello, Codeforces!
[CS Academy](https://csacademy.com/) will continue to host the online mirror of Romania's IOI 2017 Selection Contests. The [third round](https://csacademy.com/contest/romanian-ioi-2017-selection-3/) will take place on [Wednesday, 10/May/2015 07:00:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Romanian+IOI+2017+Selection+%233&iso=20170510T07&p1=1440&ah=5). The round will be rated for all users. You will have to solve **3** problems in **5** hours. The statements will be available in English and Romanian.
#### 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 [email protected]
...
csacademy
81.
Round #43 with prizes (unusual start time) Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #43](https://csacademy.com/contest/round-43/) will take place on [Sunday, 27/August/2017 12:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2343&iso=20170827T12&p1=1440&ah=2). 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 [user:maryanna2015,2017-08-25] 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$
1. Second place: 50$
1. 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 use...
csacademy
82.
Round #57 (Div. 2) Привет, Codeforces!
Мы проведём очередной контест на [csacademy.com](http://csacademy.com). [Раунд 57](https://csacademy.com/contest/round-57/) состоится в [субботу, 18 ноября 2017, в 18:05 (МСК)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2357&iso=20171118T1505&p1=1440&ah=2). Раунд подготовлен для второго дивизона, и будет рейтинговым для участников с рейтингом меньше **1800**. Участники из первого дивизиона приглашаются написать раунд вне конкурса.
#### Формат соревнования:
- Вам будут предложены **5** задач на **2** часа.
- Посылки тестируются сразу на всех тестах.
- Частичные баллы отсутствуют, поэтому необходимо пройти все тесты, чтобы решение засчиталось (правила ACM-ICPC).
- Динамическая стоимость задач. Это означает, что количество баллов за задачу будет зависеть от того, сколько участников успешно решит задачу. Баллы варьируются от 100 до 1000.
- При равном количестве баллов, выше окажется участник с минимальным штрафом.
#### Си...
csacademy
83.
Round #60 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #60](https://csacademy.com/contest/round-60/) will take place on [Wednesday, December/06/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2360&iso=20171206T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 t...
csacademy
84.
Romanian IOI 2017 Selection #6 Hello, Codeforces!
[CS Academy](https://csacademy.com/) will continue continue to host the online mirrors of Romania's National Selection Camps for IOI 2017. [Round #6](https://csacademy.com/contest/romanian-ioi-2017-selection-6/) takes place on [Tuesday, 06 June 13:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Romanian+IOI+2017+Selection+%236&iso=20170606T13&p1=1440&ah=5). 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@cs...
csacademy
85.
Round #42 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #42](https://csacademy.com/contest/round-42/) will take place on [Wednesday, August/16/2017 15:00 (UTC)](https://www.timeanddate.com/g00/worldclock/fixedtime.html?msg=CS+Academy+Round+%2342&iso=20170816T15&p1=%3A&ah=2&i10c.referrer=). 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...
csacademy
86.
Round #37 (Div. 2) + Special Prizes Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #37](https://csacademy.com/contest/round-37/) will take place on [Wednesday, July/12/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2337&iso=20170712T15&p1=1440&ah=2). 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, [user:wefgef,2017-07-11]. 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 hav...
csacademy
87.
Round #50 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #50](https://csacademy.com/contest/round-50/) will take place on [Wednesday, September/26/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2350&iso=20170927T15&p1=1440&ah=2). 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 ...
csacademy
88.
Balkan OI 2017 Day 2 online mirror Hello, Codeforces!
The 25th [Balkan Olympiad in Informatics](http://www.boi2017.md/) 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](https://csacademy.com/contest/balkan-oi-2017-day-2/) starts on [Thursday, July 06, 11:00:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Balkan+OI+2017+Day+2+Online+Mirror&iso=20170706T11&p1=1440&ah=5), 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...
csacademy
89.
Romanian IOI 2017 Selection #5 Привет, Codeforces!!
[CS Academy](https://csacademy.com/)продолжаем зеркальную трансляцию Национального отборочного тура IOI 2017 (Румыния). [Раунд #5](https://csacademy.com/contest/romanian-ioi-2017-selection-5/) состоится в [среду, 24 Maя 18:00 (Мск)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Romanian+IOI+2017+Selection+%235&iso=20170524T15&p1=1440&ah=5). 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 [email protected] или в комме...
csacademy
90.
Round #59 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #59](https://csacademy.com/contest/round-59/) will take place on [Wednesday, November/29/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2359&iso=20171129T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### 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...
csacademy
91.
Round #47 (Div. 1 + Div. 2) Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #47](https://csacademy.com/contest/round-47/) will take place on [Wednesday, 06/September/2017 15:15 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2347&iso=20170906T1515&p1=1440&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
This round will be authored by the CS Academy team.
#### 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 ...
csacademy
92.
Round #48 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #48](https://csacademy.com/contest/round-48/) will take place on [Wednesday, September/13/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2348&iso=20170913T15&p1=1440&ah=2). 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 ...
csacademy
93.
IOI 2016 Training Round #5 Hello, Codeforces!
The series of contests dedicated to [IOI 2016](http://ioi2016.ru/) will come to an end tomorrow with [IOI 2016 Training Round #5](https://csacademy.com/contest/ioi-2016-training-round-5/). We will again use problems from past Romanian competitions. For this reason, the round will be unrated.
The contest will take place on [Sunday, Aug/07/2016 08:00 (UTC)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+IOI+2016+Training+Round+%235&iso=20160807T08&p1=1440&ah=4). This round will be more difficult than the [previous ones](https://csacademy.com/contests/). Don't forget to register in order to participate.
#### 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 shar...
csacademy
94.
EJOI 2017 Day 1 online mirror Hello, Codeforces!
The 1st [European Junior Olympiad in Informatics](http://ejoi.org/) takes place in Sofia, Bulgaria, from September 07 (arrival day) to September 13 (departure day) 2017. EJOI is a significant event, a stepping-stone, in the development of the elite of the IT industry in Council of Europe member states.
CS Academy will host the online mirrors of both competition days. The [first contest](https://csacademy.com/contest/ejoi-2017-day-1/) starts on [Saturday, September 09, 11:00:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=EJOI+2017+Day+1&iso=20170909T11&p1=1440&ah=4), one hour after the onsite competition ends. The round will be **unrated** on CS Academy.
#### Contest format
- You will have to solve **3** 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 s...
csacademy
95.
Round #73 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #73](https://csacademy.com/contest/round-73/) will take place on [Wednesday, March/14/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2373&iso=20180314T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 ...
csacademy
96.
Round #65 (Div. 2) Happy New Year, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #65](https://csacademy.com/contest/round-65/) will take place on [Wednesday, January/17/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2365&iso=20180117T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 p...
csacademy
97.
Round #70 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #70](https://csacademy.com/contest/round-70/) will take place on [Wednesday, 21/February/2017 15:35 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2370&iso=20180221T1535&p1=1440&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 ...
csacademy
98.
Round #69 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #69](https://csacademy.com/contest/round-69/) will take place on [Wednesday, February/14/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2369&iso=20180214T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 t...
csacademy
99.
Round #40 (Div. 2) + Special Prizes Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #40](https://csacademy.com/contest/round-40/) will take place on [Wednesday, August/02/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2340&iso=20170802T15&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1675**.
#### Special prizes
This round will have 3 special prizes consisting of private coaching lessons with our contest coordinator, [user:wefgef,2017-07-31]. 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 n...
csacademy
100.
Round #86 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #86](https://csacademy.com/contest/round-86/) will take place on [Wednesday, August/22/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2386&iso=20180822T150005&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### 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...
csacademy
101.
Round #58 (Div. 1 + Div. 2) with prizes Hello, Codeforces!
We're going to host a new contest at [csacademy.com](http://csacademy.com). [Round #58](https://csacademy.com/contest/round-58/) will take place on [Wednesday, 22/November/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2358&iso=20171122T1505&p1=1440&ah=2). This contest will be a Div1 + Div2, with **7** tasks of varying difficulty that need to be solved in **2** hours.
#### 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.
#### Prizes
We're going to award the following prizes:
1. Fir...
csacademy
102.
Round #55 (Div. 2) + Rating Change Hello, Codeforces!
During the past days at [CS Academy](http://csacademy.com), we've been working on tweaking the rating algorithm, and now it's finally here! The total range of the rating has increased, and we also changed the cutoffs for the rating colors and, more important, for the divisions. From now on, you'll be rated in a Div. 2 round if your rating is below **1800**.
### Round #55
We are also going to host a new contest, [Round #55](https://csacademy.com/contest/round-55/) will take place on [Wednesday, November/01/2017 16:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2355&iso=20171101T1605&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### 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-sty...
csacademy
103.
Round #81 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #81](https://csacademy.com/contest/round-81/) will take place on [Wednesday, June/06/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2381&iso=20180606T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### 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 sol...
csacademy
104.
Romanian IOI 2017 Selection #4 Hello, Codeforces!
[CS Academy](https://csacademy.com/) will continue continue to host the online mirrors of Romania's National Selection Camps for IOI 2017. [Round #4](https://csacademy.com/contest/romanian-ioi-2017-selection-4/) takes place on [Monday, 22 May 13:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Romanian+IOI+2017+Selection+%234&iso=20170522T13&p1=1440&ah=5). 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...
csacademy
105.
IOI 2016 Training Round #2 — csacademy.com Здравствуйте, На Codeforces!
Мы продолжаем серию конкурсов, посвященных [IOI 2016](http://ioi2016.ru/) с [[IOI 2016 Training Round #2](https://csacademy.com/contest/ioi-2016-training-round-2/). Мы снова будем использовать проблемы из прошлых румынских контестов. По этой причине, раунд будет нерейтинговым.
Соревнование будет проходить в [четверг, 16.06.2016 в 16:00 (Мск)](http://www.timeanddate.com/worldclock/fixedtime.html?msg=IOI+2016+Training+Round+%232&iso=20160616T13&p1=%3A&ah=3). Уровень сложности будет средний, похожий на предыдущий раунд. Не забудьте зарегистрироваться для участия.
#### Формат конкурса:
- Вам предлагается решить 3 задачи за 3 часа.
- Мы обеспечиваем обратную связь на протяжении всего конкурса.
- Задания будут засчитываться частично. Максимальный балл за каждую задачу будет 100 очков.
- Не будет системы штрафов, поэтому два пользователя, имеющие одинаковую сумму очков в конце конкурса, разделят одно место в турнирной таблице.
Авторы задач для этой...
csacademy
106.
Round #83 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #83](https://csacademy.com/contest/round-83/) will take place on [Wednesday, July/04/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2383&iso=20180704T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### 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 sol...
csacademy
107.
Round #66 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #66](https://csacademy.com/contest/round-66/) will take place on [Wednesday, January/24/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2366&iso=20180124T1505&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 ...
csacademy
108.
Round #63 (Div. 2) Happy New Year, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #63](https://csacademy.com/contest/round-63/) will take place on [Wednesday, January/03/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2363&iso=20180103T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 p...
csacademy
109.
The history of some recurring problem Hi everyone! This one will be long and contain a lot of off-topic, prepare yourself (or skip down to solution of mentioned problem)!
### Intro
In this blog post I would like to talk about some problem that somehow was on my mind for several years and yet only now I have some more or less complete understanding of how to deal with it. The problem is as follows:
_You're given string $S$ and $q$ queries. In each query you have to count amount of distinct substrings of $S[l,r]$._
[cut]
<br><br>
Since then and for a long time this one was probably the hardest string problem I could ever imagine. In particular I saw some partial cases of it on several judges, which supported my assumption that problem is particularly tough. Some notable examples:
- [To Queue or not to Queue](https://www.codechef.com/problems/TMP01) on codechef by [user:Gerald,2018-08-24]. It is the same problem, but queries are formed as queue, i.e. you have to add letter to the right, delete letters from th...
[user:wefgef,2018-08-24] who said that he remembers that I sent a problem and
gave me coolcsacademy t-shirt
110.
Round #51 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #51](https://csacademy.com/contest/round-51/) will take place on [Wednesday, October/04/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2351&iso=20171004T15&p1=1440&ah=2). 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 so...
csacademy
111.
Round #53 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #53](https://csacademy.com/contest/round-53/) will take place on [Wednesday, October/18/2017 15:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2353&iso=20171018T15&p1=1440&ah=2). 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 so...
csacademy
112.
FIICode Contest 2020 Hello everyone,
I would like to announce a new edition of [FIICode](http://fiicode.asii.ro)
FIICode is a contest organized by the Computer Science Students' Association in Iași, together with the Faculty of Computer Science in Iași.
This we hold the 5th edition of the competition, and the second year in which we host the contest on [CSAcademy](http://csacademy.com).
The [first round](https://csacademy.com/contest/fii-code-2020-round-1) will be in two days, on 14th February.
**Update: The round will be rated for everyone**
The algorithmic section of the contest is composed of 3 online rounds, from which we will select the finalists: the first 5 international competitors, and the first 25 romanian and moldavian competitiors will qualify for the onsite final.
The Final will be held in Iasi (Romania) in 8-10 May.
You can find more details on the [competition site](http://fiicode.asii.ro/en/algoritmica) or on [facebook page](https://www.facebook.com/FIICode/).
PS....
on [CSAcademy](http://csacademy.com).
113.
EJOI 2017 Day 2 online mirror Hello, Codeforces!
The 1st [European Junior Olympiad in Informatics](http://ejoi.org/) is taking place in Sofia, Bulgaria, from September 07 (arrival day) to September 13 (departure day) 2017.
CS Academy will host the online mirrors of both competition days. The [second contest](https://csacademy.com/contest/ejoi-2017-day-2/) starts on [Monday, September 11, 11:00:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=EJOI+2017+Day+2+Online+Mirror&iso=20170911T11&p1=1440&ah=4), one hour after the onsite competition ends. The round will be **unrated** on CS Academy.
#### Contest format
- You will have to solve **3** 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.
If you find any bugs please ...
csacademy
114.
Romanian IOI 2017 Selection #1 Hello, Codeforces!
The first round of Romania's IOI 2017 Selection Contests took place a week ago. [CS Academy](https://csacademy.com/) will host the [online mirror](https://csacademy.com/contest/romanian-ioi-2017-selection-1/) on [Sunday, 14/May/2017 09:00:00 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Romanian+IOI+2017+Selection+%231&iso=20170514T09&p1=1440&ah=5). 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 cou...
csacademy
115.
Round #62 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #62](https://csacademy.com/contest/round-62/) will take place on [Wednesday, December/20/2017 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2362&iso=20171220T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 t...
csacademy
116.
Round #74 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #74](https://csacademy.com/contest/round-74/) will take place on [Wednesday, March/28/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2374&iso=20180328T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 ...
csacademy
117.
Round #77 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #77](https://csacademy.com/contest/round-77/) will take place on [Wednesday, April/18/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2377&iso=20180418T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### 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 so...
csacademy
118.
Round #68 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #68](https://csacademy.com/contest/round-68/) will take place on [Wednesday, February/07/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2368&iso=20180207T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 t...
csacademy
119.
Round #79 (Div. 2) Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #79](https://csacademy.com/contest/round-79/) will take place on [Wednesday, May/09/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2379&iso=20180509T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### 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 solu...
csacademy
120.
IATI Shumen 2017 Day 1 online mirror The 9th [International Autumn Tournament in Informatics](http://iati-shu.org/en/home/) will be held from the 22nd to 26th of November, 2017. The tournament is held in the city of Shumen, Bulgaria. The participants will not only compete in the field of Informatics, but will also be encouraged to enrich their knowledge and skills in the areas of computer science.
CS Academy will host the online mirrors of both competition days. The [first contest](https://csacademy.com/contest/iati-shumen-2017-day-1/) starts on [Friday, November 24, 13:00:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=IATI+Shumen+2017+Day+1+online+mirror&iso=20171124T13&p1=1440&ah=5), one hour after the onsite competition ends. 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...
csacademy
121.
Round #76 (Div. 2) unusual day Hello, Codeforces!
We are going to host a new contest at [csacademy.com](http://csacademy.com). [Round #76](https://csacademy.com/contest/round-76/) will take place on [Thursday, April/12/2018 15:05 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CS+Academy+Round+%2376&iso=20180412T1505&p1=1440&ah=2). This round will be a Div. 2, affecting users with a rating below **1800**.
#### Facebook event
Recently, Facebook has reintroduced the possibility of recurring events. If you choose "Interested" [here](https://www.facebook.com/events/1480600318656445/), you will be notified before each round we organise from now on.
#### 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 s...
csacademy
Codeforces (c) Copyright 2010-2024 Mike Mirzayanov
The only programming contests Web 2.0 platform
Server time: Apr/24/2024 00:42:09 (l2).
Desktop version, switch to mobile version.
Supported by
