Hi I'm going to participate in the camp this year. I just saw the site is now available, but not sure how to register, because U-Tokyo is not on the list of Delegation in the camp registration form.

Do you know how to register your university, or can I find some contact to the organizer?

UPD: thanks I've got a response.

Hi I'm considering to participate in ICPC Bangkok regional this year. However, there seems to be no information other than date here. I'm hesitating to apply before knowing the accommodation and schedule. The registration must be done until 23 Oct '16, so I'm anxious that it'll be updated before the deadline.

Does anyone have information about Bangkok regional this year?

Now it seems the site is updated and the schedule is tentatively determined. Thanks you :)

https://stormy-everglades-64462.herokuapp.com/static_pages/home

For my practice of web applications, I created a simple page to compare CodeForces solved problem between two users, like POJ.org

Though it's still so inefficient and takes long time to show the result, it may be helpful, so I share here.

The usage is quite simple and needs no explanation.

Source files in github

Do not try cracking, please.

Hello Codeforces!

evima, yosupo and I would like you to participate in Codeforces Round #286. It will be held on Sunday, January 18th at 16:00 MSK. Please note that this round starts on unusual time.

Great thanks to Zlobober who helped us prepare this round, Delinur who translated statements into Russian and MikeMirzayanov who created Codeforces and polygon.

This is the 3rd time(following #162 and #263) for me, and the 1st time for evima and yosupo to prepare a Codeforces Round.

Scores of the problems will be

500-1000-1750-1750-2500 for Div.1, and

500-1000-1500-2000-2750 for Div.2.

In this round, you'll help a man named Mr. kitayuta. I hope he will participate :)

The system tests are now over! The top-5 are as follows:

Div.1:

1.ilyakor

2.kcm1700

3.LayCurse

4.RomaWhite

5.TankEngineer

Div.2:

1.Konijntje

2.cpcpc

3.zgzjsxshycxksxhsh

4.Ronnie007

5.sha384

Also, special congrats on Petr, who solved problem E in Div.1, which anyone else could not solve.

Here are the editorials

Do you know kutengine? He has made some remarkable result here(i.e. 2nd place in Round 257 — http://codeforces.net/contest/449/standings) However, I found some strange things about his logs — in #257, his submission logs are as follows :

• 00:23:55 C Wrong answer on pretest 5 [pretests]
• 00:26:05 B Wrong answer on pretest 4 [pretests]
• 00:27:49 A Accepted [final tests]
• 00:43:07 B Accepted [final tests]
• 01:07:17 C Wrong answer on pretest 6 [pretests]
• 01:15:19 C Accepted [final tests]
• 01:16:36 D Memory limit exceeded on pretest 1 [pretests]
• 01:18:47 D Accepted [final tests]
• 01:45:52 E Accepted [final tests]

When you get WA in contests, sometimes you give up a problem temporarily, and move on to another problem. But if he did not solve A and B simultaneously, he solved problem A in less than 2 minutes! This problem A isn't that simple(it took fastest participant 5 minutes). Also, he made his first submission to problem D, just 1 minute after his submission to C.

Also his codes are a bit strange. Here are the codes of A,B and C in #257.

• http://codeforces.net/contest/449/submission/7162064
• http://codeforces.net/contest/449/submission/7164450
• http://codeforces.net/contest/449/submission/7168442

Many coders use "template" , on which they write codes. Usually, a person use the same template to avoid confusion. However, the three submissions seem to be based on different template. First code defines pair<int, int> as PII; but the second and third define pair<int, int> as pii; It would be too confusing!

The matters are almost the same in his last round — Bayan 2015 Contest Warm Up.

If he participated individually, I want to know why he made such a strategy.

Всем привет!

snuke, EnumerativeCombinatorics и я приглашаем всех поучаствовать в Codeforces Round #263. Он состоится во вторник 26-го августа в 18:00 по московскому времени. Обратите внимание на необычное время старта раунда.

Спасибо Gerald за помощь в подготовке раунда, MikeMirzayanov за создание платформы для проведения соревнований, а Delinur за перевод условий.

В задачах нашего раунда вы будете помогать двум персонажам: Яблов (англ. Appleman) и Тостов (англ. Toastman). Удачи и удовольствия от решения задач на раунде!

UPD. В обоих дивизионах (Div.1 и Div.2) распределение баллов по задачам будет стандартным: 500-1000-1500-2000-2500.

Inheriting JOI Open Contest 2013 last year,JOI(Japanese Olympiad in Informatics) will hold two contests mainly for high-school students who enter IOI 2014 to practice for IOI(of course, everyone can participate)

The site is here: http://cms.ioi-jp.org/open-2014/index.html

You can see details in the site. First contest will be held on Sunday, June 22, 2014. Second contest will be held on Sunday, June 29, 2014. The problem statements are in Japanese and in English.

Each contest has 2 rounds in different time(for those who are in different timezone from Japan;but you can participate in the round you like). 2 rounds have the same problemset. The contest has 3 tasks in 5 hours.

Last year, we used Facebook/Twitter authorization,but we use normal authorization this year. You can register for the contest from the time 30 minutes before the contest beginning(You can register even if it is after contest).

Good luck in IOI :))

(note that I won't enter IOI anymore)

I've made a mistake ; I put "Discard" to cancel the change. But this button is to delete all.

I found the official site of "Looking for a challenge" (http://www.lookingforachallengethebook.com/) updated and now the site has order form. I really want the book, so I ordered one.But unfortunately, there have been no response.

Does anyone get the book ordered by the form, or receive any response?

UPD: On 23rd May, I got a response!

UPD: I couldn't get the book; so I asked the IOI team leader of Japan to get some copies directly from Poland Team. Fortunately, because the trouble was transportation, I got a copy.

Subsequently to the JOI Ninja Contest last year(http://codeforces.net/blog/entry/5262 ), JOI (Japanese Olympiad in Informatics) will hold a contest mainly for high-school students who enter IOI this year(of course, everyone can participate)

the site is here : http://cms.ioi-jp.org/

I hope it will help you prepare for IOI :)

UPD: The ranking system is not a perfect one,it is refreshed with delay now. In the actual contest, it will be refreshed once in 5 or 10 minutes,but some trouble may occur,so please don't trust the ranking absolutely.

3 days ago,I participated Codeforces #145. I got 16th place,when my rating was 2131. I thought,I would finally become Grandmaster!! However,my rating changed to 2196.Just a bit lower than 2200.

Today,I participated TopCoder SRM 558. I got 22th place,when my rating was 2088. I thought,I would become RedCoder this time!! However,my rating changed to 2199.I realized I'm unlucky :(

upd: on November 1st,I finally become a Grandmaster :)

JOI(Japanese Olympiad in Informatics) will hold JOI Ninja Contest,a training contest for IOI(International Olympiad in Informatics). Contest site is here -> http://joiopen2012.contest.atcoder.jp/

The contest will begin at 4:00,September 17th,2012(GMT) (in Japan,it will begin at 13:00 in the same day)

The contest duration is 5 hours,the same hour as IOI,and the number of the problems is 3,this is also same as IOI. I guess other features are like IOI. However, we use stdin/stdout for input/output. Submitting is similar to ordinary Online Contest(not release tokens like IOI,just submit source code)

(actually the problems were made for APIO(Asia-Pacific Informatics Olympiad) 2012,so the problem level is not low)

The problem statements are in Japanese and English.

I hope many contestants will attend this contest,and raise their level together!! (of course,those who aren't contestants of IOI 2012 also can attend it :) )

UPD1: JOI also hold the same contests that begin at 9:00and at 15:00,Septenber 17th(GMT).(of course their duration is 5 hour,too)

**contest sites of other times: http://joiopen2012b.contest.atcoder.jp/ http://joiopen2012c.contest.atcoder.jp/ **

I wanted to solve ABBYY Cup 2.0 Easy for practice,and I tried to register for practice, but there was no button to register. So I used "virtual participation",and I solved some problems,but now the virtual contest is over. I can't still register for practice,so I can't practice the rest of the problems...

please help me!!

please help!! i tried to submit my solution to the problem E many times(not official,for practice), but my solution couldn’t be received. the screen says “Ooops! Something has broken down in Codeforces. Do not panic, you can try to reload the page or return Home. Anyway we will carefully read megabytes of logs, analyze stacktraces and fix the problem.”. i tried submitting a empty-code to it,and the code was received(of course, wrong answer). and i tried log-out and log-in,but the situation didn’t improve. ??why?? my code is no compile-error, or memory limit exeed. also, i tried the custom test,and the custom test was no problem.

thank you for fixing the problem ^_^ my cause of trouble is using the "%lld". now,the program doesn't be received,too,however,the screen told me a proper warning.