accidentallygivenfuck's blog

By accidentallygivenfuck, history, 15 months ago, In English,

Dear High Court of Byteland,

I would like to sue Syloviaely for impersonating me, and I demand 1000 Codeforces rating points (which is to be removed from his account and added to mine). You see, my name is Sylap Aliyev and this Syloviaely guy is using anagram of my name and plus a few changes, and thus benefiting from my popularity in a way that is not allowed by the Byteland laws. Using my popularity, he has even risen to top-10 charts of Codeforces. I think I am being very generous by demanding only 1000 rating points. Please, everyone reading this email, acknowledge my magnanimity.

Thanks.

Sincerely,
The Real Sylap Aliyev

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By accidentallygivenfuck, history, 3 years ago, In English,

Is there anyone who is studying at KAIST and can't find teammates for team contests?

I am a freshman and I don't know how I should look for teammates.

Any advice would be appreciated a lot.

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By accidentallygivenfuck, history, 3 years ago, In English,

Although the video is 2 months old, I believe most of you haven't watched it yet.

So here is the YouTube link: How Snapchat's filters work

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By accidentallygivenfuck, history, 3 years ago, In English,

Hello Codeforces,

I am currently located in Turkmenistan and (I believe) for some political reasons ISPs here have blocked most of the websites (Facebook, Youtube, etc have long been blocked here before. When I mean "most" I mean almost any website hosted outside of Turkmenistan and Russia. That's just an observation though). Codeforces is one of the few websites I can currently access. So I decided to ask for a help here.

Would anyone owning an online server (vps, cloud, etc. anything I can ssh into and use as proxy) be kind enough to give me their ssh credentials (or even better/more secure would be to add a new user to the server for me), so that I can bypass the firewall?

I have a cloud server running on Amazon AWS. But I can not use it as proxy or vpn, because it is blocked as well.

Please comment below if you are able to help.

Thanks.

P.S. Sorry for baity title.

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By accidentallygivenfuck, history, 3 years ago, In English,

Because, no one told you about "News" section in Russian version of Codeforces!

http://media.riffsy.com/videos/7d8ebb7cf892c4d15fbb1da536b2a445/webm

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By accidentallygivenfuck, history, 3 years ago, In English,

Stop fucking yourself. If it has been long enough for you to exhibit some kind of progress but you haven't fucking shown any yet, then fucking quit. You are little fucking cunt that can't just put their ass down and fucking do the shit they should do. You are fucking feeble looser that would be the most use to themselves only and only by closing themselves in a fucking toilet and fucking their hand (And yeah their hand, because that is the only thing they can fuck). If you still insist that you ain't no fucking cumming pussy, then fucking force yourself to get some shit done and show me that you are not some worthless shit. But you know what? I know what exactly will happen. You will accept the fucking challenge but still you will fucking fuck yourself in the anus and won't achieve any fucking shit. Now prove me wrong fucking motherfucker.

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By accidentallygivenfuck, history, 3 years ago, In English,

Or a tree of questions?

a question on trees

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By accidentallygivenfuck, history, 3 years ago, In English,

Mihail, put an ad on tourist's profile page and use the money earned from the ads to buy a birthday gift for Tanya each year.

I don't often think in such a cute way. So, Mihail, think twice.

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By accidentallygivenfuck, history, 3 years ago, In English,
 
 
 
 
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By accidentallygivenfuck, history, 3 years ago, In English,

I am trying to redeem my $100 AWS credits that I got from HackerRank CodeStorm, but I don't have credit card, so I can't complete my registration to AWS.

Does anyone know how to redeem AWS credits without credit card?

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By accidentallygivenfuck, history, 4 years ago, In English,

Hello,

I am having hard time in understanding the statement of problem Cow Run, USACO 2012 January Contest. I can't understand what the problem statement asks for.

At first, I thought problem was about finding a sequence of moves that, no matter how Bessie moves, guarantees that cows will end the run at a position no more than K units distance away from the initial position.

But, then, why are Bessie's moves provided?

I would appreciate any help.
Thanks.

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By accidentallygivenfuck, history, 4 years ago, In English,

Hello Codeforces,

I want to share with you a simple tool that I've been using for a while now that I named "Ineffable".

What is ineffable?

Simple command-line grader for local grading of solutions for problems of competitive programming contests. It is written in Python and it uses timeout Perl library to limit resources (time and memory limits) of program being tested.

It works on Ubuntu, and I guess it should work on any Linux/Unix system as long as Python and Perl are installed.

Screenshots


(Original quote is "Success consists of going from failure to failure without loss of enthusiasm")

Installation

Run the following commands on your terminal:

$ mkdir ~/.ineffable
$ cd ~/.ineffable
$ wget https://bitbucket.org/silap/ineffable/downloads/ineffable-1.0.zip
$ unzip master.zip
$ rm master.zip
$ mv silap-ineffable-*/* .
$ rm -r silap-ineffable-*/
$ sudo ln -s ~/.ineffable/ineffable /usr/local/bin/ineffable

Or alternatively you may run this command if you have curl installed:

$ bash < <(curl -sL https://bitbucket.org/silap/ineffable/raw/f208b207160eacd8ba4c30c078d1255e309c6b40/install.sh)

Configuration

Whenever you run ineffable it looks for ineff.json file. You can also tell ineffable which configuration file to use using this syntax: inefabble another.json.

Configuring ineffable is easy and quite intuitive. After you install ineffable you can view the example configuration file that is located at ~/.ineffable/ineff.json.example.

Available configuration options are as follows:

key example value Description
pkdesc "Balkan OI 2014 Day 2 Problem Ephesus" Package description. (Optional)
pbcode "steeple" Problem code. Ineffable searches for string {PROBLEM} in keys warmup, execute, inp, out and tstdir, and replaces them with pbcode value. (Optional)
tl 1000 Time limit (in milliseconds). (Required)
ml 65536 Memory limit (in kilobytes). (Required)
warmup "g++ -O2 -o solution solution.cpp" Command to be executed before the grading starts. For example, it can be used to compile C++ code. Grading stops if the command exits with non-zero code (such as, when compilation fails). (Optional)
execute "./solution" or "python solution.py" Command that runs the solution. Solution needs to read from stdin and write to stdout. (Required)
tstdir "steeple_tests" Directory where the test files are located. If ommited, it is assumed that tests are located in the current directory. (Optional)

There are 2 different ways to show ineffable which files are input files and which files are output files:

  1. Smart stars:

    "inp": "input*.txt",
    "out": "output*.txt"
  1. Listing files.

    # Syntax 1
    
    "iopairs": {
      "input1.txt": "output1.txt",
      "input2.txt": "output2.txt",
      "input3.txt": "output3.txt"
    }
    
    # Syntax 2
    
    "iopairs": {
      "inp": {"input1.txt", "input2.txt", "input3.txt"},
      "out": {"output1.txt", "output2.txt", "output3.txt"}
    }

See it at work (sample session)

Let's solve problem Cow Steeplechase of USACO 2011 November Contest.

$ # Create folder `steeple` in your desktop and another folder `steeple_tests` inside it.
$ mkdir Desktop/steeple
$ cd Desktop/steeple
$ mkdir steeple_tests
$ cd steeple_tests
$
$ # Download and extract test data into `steeple/steeple_tests/`.
$ wget -q http://usaco.org/current/data/steeple.zip
$ unzip -q steeple.zip
$ rm steeple.zip
$ cd ..
$
$ # Create file `ineff.json` and configure.
$ touch ineff.json
$ echo '{
  "pkdesc": "Cow Steeplechase (USACO Gold November 2011 Contest)",
  "pbcode": "steeple",
  "tl": 3000,
  "ml": 65536,
  "warmup": "g++ -std=c++11 -O2 -o {PROBLEM} {PROBLEM}.cpp",
  "execute": "./{PROBLEM}",
  "tstdir": "{PROBLEM}_tests/",
  "inp": "I.*",
  "out": "O.*"
}' >ineff.json
$
$ # Create `steeple.cpp` and open it with your favorite editor to code your solution.
$ touch steeple.cpp
$ vim steeple.cpp
$ # ...
$
$ # Test your solution
$ ineffable

As I haven't spent much effort in making ineffable, there may be some bugs. I won't be able to fix the bugs at least till the IOI 2015 ends.

Ineffable is a simple project and anyone who knows some Python can alter it for their own purpose or even add some features. Project is available on Bitbucket (sorry no Github, it is blocked in my country :/).

EDIT: "Installation" section updated.
EDIT 2: Download links updated (to be able to keep number of downloads :P).

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By accidentallygivenfuck, history, 4 years ago, In English,

Today, I was checking the official solution for problem grassplant of USACO 2011 December Contest. I ran the solution on 12th test and it gave me runtime error (segmentation fault). I realized it was caused by stack overflow. Then (somewhy) I added (int) before E[u].size() in the function hang() and ran it on 12th test again. Surprisingly, stack did not overflow this time.

I tried doing it several times, and the code without (int) always run out of 8Mb of stack memory and the code with it used less than 8Mb of stack memory.

Can anyone who gets this stuff tell why this happens?

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By accidentallygivenfuck, 4 years ago, In English,

Hello Codeforces,

Today, after getting bored of sleeping, I decided to sharpen up my vim skills. So I opened the firefox, then developer tools, and set the 'keybindings' to 'vim style', and decided to write a user script. A user script that automatically downvotes the spammers.

If you are fed up of spammers as much as I am, then I invite you to use my user script. To install the user script in your browser, just follow these 2 instructions:

1. Install Greasemonkey/Tampermonkey

Choose your browser
Greasemonkey Tampermonkey

2. Install So spammer, much asshole!

Let Greasemonkey/Tampermonkey auto-install the user script

Who are those "spammers"?

Well, at the moment, there are only 6 people in the list of the spammers. But, these 6 people are (mostly) those that asked for downvotes in some particular comment/post. These people will be removed from this list after the real list of the spammers will be ready. That is why, I ask you to suggest spammers (with reasonable evidence alongside, of course). Thanks.

So here is the list of those 6 "spammers":

  1. c1one
  2. makkar
  3. mewat1000
  4. kursatbakis0
  5. ninjacoder
    • I like the personality of this guy, but his comments, they are, ...

    • To aradhya, I will not WASTE my time on a such miserable rat like you, but if you will continue punishing my Mother language you will not live long enough to regret it!!!
    • Mal bolsan name edeli biz? (Чё нам делать то, если ты баран?)

    • and lots of other comments that contain the f-word
  6. silap-aliyev
    • so that the above 5 guys won't be angry at me

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By accidentallygivenfuck, 4 years ago, In English,

This years last USACO contest is running!

You can participate in the contest by starting your 4-hour time block any time between April 3 and April 6.
You need to register for the http://usaco.org to be able to participate in the contest.

Contest link: http://usaco.org/index.php?page=viewcontest
Duration: 4 hours

For most problems resource limitations are as follows:

Time Limit: 2s (C/C++/Pascal), 4s (Java/Python)
Memory Limit: 256MB

P.S. I know that the title sucks, so does the grader of the interactive problem :/

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By accidentallygivenfuck, 4 years ago, In English,

Hey 'sup? Check dis out: http://com.google

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By accidentallygivenfuck, 4 years ago, In English,

Once upon a time my password used to be 123456, but not anymore :'(

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By accidentallygivenfuck, 4 years ago, In English,

Hello Codeforces,

A few days ago, I was sitting and thinking, and invented a data structure with time complexities and (preprocessing and per query, respectively) I was being lazy and surfing the net :P I was searching for some good HTML5 <canvas> tutorials/example usages and found this.

ololosh

It is cool, but not so beautiful. So I modified it a bit to make it more beautiful and more "competitive programmerish". :P :D :P

trollolosh

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By accidentallygivenfuck, 4 years ago, In English,

Hi Codeforces,

Does anyone know a way to download problems in a PDF file for later offline use?

I know a somewhat not-so-good way:

  • Open codeforces.com/contest/<contestid>/problems
  • Press ctrl+p
  • Set the correct preferences, so that the result will be readable
  • Print to file

But I remember that I downloaded 482B - Интересный массив in a PDF file at the beginning of the contest, when I tried to open the problem page. I don't know how, but maybe it was because the servers were too busy. That is why, I thought there might be a way to download problems in PDF format.

I still have the file. This file is more convenient than printing the problems page.

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By accidentallygivenfuck, 4 years ago, In English,

Hello Codeforces!

Today, I translated the BIT tutorial by e-maxx into English:
http://silap.tk/blog/2014/12/fenwick-tree/

PS Please, inform if there are any grammar mistakes or typos.

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By accidentallygivenfuck, 4 years ago, In English,

After 3 years, finally decided to share this.

3 year old screenshot

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By accidentallygivenfuck, 5 years ago, In English,

Original Post

IOI 2014 APP for Android is out!! You can download it at

https://play.google.com/store/apps/details?id=org.ioi.olympiad2014

Key features are:

  • LIVE scores
  • Results
  • Schedule of events
  • News

Minimum Requirements:

  • Android Froyo (2.2.3)
  • Wifi or 3G/4G
  • GPS

  

BTW Organizers also will be providing the Leaders and Deputy Leaders Acer Iconia A1-811 tablet (Android 4.2 OS) for use during IOI2014.

Acer Iconia A1-811 picture

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By accidentallygivenfuck, 5 years ago, In English,

Problem link: 128C - Игра с прямоугольниками
Official Editorial: Russian only

I've got idea that is different from the official one, plus:

  • with worse time complexity
  • with worse memory requirements
  • and it seems to be incorrect one

But the problem is, I can't find what I am missing :(
Here is my code (unfortunately, it is full of trash, and I am too lazy to remove them). So I am asking you to help.

Brief description

Initially there is a grid and a rectangle already drawn on it of size n × m.You need to draw k more rectangles and each rectangle should be drawn inside the previously drawn rectangle. Rectangles' sides should be one the grid lines and they should not touch each other. The problem is in how many ways you can do it (or, how many different pictures can you draw in total).

My solution

Let's assume that there is a grid of size w × h. Let g(w, h, k) be number of different pictures you can obtain by drawing k rectangles one inside another (plus, they should be drawn on the grid lines and their borders should not touch each other). It is clear that answer for the whole problem will be g(n - 1, m - 1, k). Now we need to know how to calculate g:

g[w][h][k] = 2*g[w][h-1][k] - g[w][h-2][k] + 2*g[w-1][h][k] - g[w-2][h][k] - 4*g[w-1][h-1][k] + g[w-2][h-2][k-1];

But using the above formula, we get negative value for some w, h, k, which is obviously incorrect. :(
It seems like that I forgot to add something or am removing too much.

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By accidentallygivenfuck, 5 years ago, In English,
Add Participant View Participants

Name CF Handle Country Birth Date Previous IOIs
Sparik Hayrapetyan sparik Armenia
Eduard Grigoryan edogrigqv2 Armenia 2010 2011 2013
Tigran Galstyan Tiko Armenia
Mushegh Shahinyan Mushegh Armenia
Florian Leimgruber fleimgruber Austria 07 Jun 1997 (16)
Gary Ye gdisastery Austria 15 Feb 1997 (17) 2013 B
Bristy Sikder bristy1588 Bangladesh 2011 2012 B 2013
Labib Md. Rashid Labib666 Bangladesh 2013
Tonmoy Mollik triploblastic Bangladesh
Hasib Al Muhaimin hasib Bangladesh 27 Oct 1996 (17) 2013
Аlexey Vistyazh netman Belarus
Dmitriy Demidko dimad Belarus 01 May 1997 (17)
Barbara Kuskova kuskova Belarus 29 Apr 1998 (16)
Fedor Korobeinikov fk2012 Belarus 15 Feb 2000 (14)
Mauricio Wilde Monasterios Daydreamer Bolivia 01 Jul 1995 (18) 2013
Isabella Defilippis Isa_Def Bolivia
Ronaldo Franco rony Bolivia
Moises Vela MoiTheKiller Bolivia
Michel Zelazny michelzel Brazil 2013
Arthur Nascimento arthur.nascimento Brazil
Mateus Bezrutchka m_bezrutchka Brazil
Arthur Pratti Dadalto Brazil
Hristo Venev mustrumr Bulgaria 2012 S 2013 G
Momchil Peychev momo_vn Bulgaria 2013 B
Encho Mishinev Enchom Bulgaria 2013 S
Stefan Ivanov Bulgaria
Ben Zhang Canada 29 Aug 1997 (16)
Yu Dingli Leoyu China
Xu Yinzhan xyz111 China
Shen Yang sy2006 China
Dong Honghua dhh1995 China
Michalis Psalios michael10024 Cyprus 2012 2013
Angelos Pelecanos AnPelec Cyprus 2013
Adamos Ttofari adamos2468 Cyprus
Andreas Theocharous Cyprus
Martin Raszyk m.raszyk Czech Republic 2013 B
Jan-Sebastian Fabík fabik Czech Republic
Ondřej Hübsch ondrah Czech Republic 2012 B
Dominik Smrž Czech Republic
Yousef Ibrahim Salama Yousef_Salama Egypt 2012 B 2013 B
Ahmed Morsy IOIer Egypt 21 Nov 1995 (18)
Oliver-Matis Lill oml1111 Estonia 28 May 1995 (19) 2013
Sami Kalliomäki Scintillo Finland 2012 2013 B
Henrik Lievonen Hennkka Finland 2013
Kalle Luopajärvi JWZMOZE Finland 2013 B
Petteri Timonen P.T Finland
Lucas Pesenti md5_84 France 30 Mar 1997 (17)
Tomas Rigaux rigauxt France 04 Nov 1997 (16)
David Cheikhi Cheikdav France
Arthur Léonard France
Nikoloz Svanidze svanidz1 Georgia 01 Apr 1996 (18) 2012 B 2013 B
Elene Machaidze emachaidze Georgia 27 Sep 1997 (16)
Nika Nadiradze nikanick11 Georgia 05 Mar 1996 (18) 2011 2012
Georgy Skhirtladze gskhirtladze Georgia 03 Aug 1999 (14)
Georgios Christoglou Giorgos_Christoglou Greece 2013
Aristofanis Rontogiannis mentalist Greece
Dimitrios Los Greece 2012 2013
Georgios Venizelos geroveni Greece
Lau Ting Fung master_miu Hong Kong
Lik Hang Poon hohomu Hong Kong 2013 B
Kam Chuen Tung alex20030190 Hong Kong 2013 S
Wai Pan Yik jasonyik Hong Kong 2012 S
Akshat Boobna akshatb India 06 May 1996 (18) 2013 B
Bhupesh Kumar bhup99 India 10 Oct 1994 (19)
Nihal Pednekar nihalpi1 India 26 Oct 1996 (17) 2013 B
Malvika Raj Joshi a06 India
Muhammad Rais Fathin Mudzakir rais.fathin38 Indonesia
Stefano Chiesa Suryanto zeulb Indonesia 2013 B
Alfonsus Raditya Arsadjaja raditya1710 Indonesia
Zamil Majdy kadalijo Indonesia
Mojtaba FayazBakhsh Mojtaba-FayazBakhsh Iran
Mohammad Amin
Khashkhashi Moghaddam
alex-mercer Iran
Amirmohsen Ahanchi persianpars Iran
Iliad Ramezani Beranabus Iran
Hirotaka Isa HIR180 Japan 12 Apr 1998 (16)
Ken Ogura catupper Japan
Ryoma Sato joisino Japan 28 Jul 1996 (17)
Yuta Takaya yutaka1999 Japan
Nurlan Zhussupov Sick_coder Kazakhstan 2013 B
Miras Myrzakerey Miras321 Kazakhstan
Ulugbek Adilbekov Algiz Kazakhstan
Daniyar Maminov Daniyar_7 Kazakhstan
Ruslan Rakhimov risonyo Kyrgyzstan 25 Oct 1997 (16)
Kadyrbek Narmamatov Kyrgyzstan 24 Jan 1998 (16)
Aleksejs Zajakins Alex_2oo8 Latvia 2013 S
Ingus Jānis Pretkalniņš Latvia
Aleksejs Popovs popoffka Latvia 2011 2012 B 2013 B
Kristaps Čivkulis kristapuciitis Latvia
Jordan Fernando Alexander Salas HappyPerson Mexico
Daniel Talamas Cano dtalamas24 Mexico 2013
Diego Alonso Roque Montoya Diego9627 Mexico 2013 S
Carlos Galeana Hernández Mexico
Petar Djerkovic Montenegro
Dejan Todorovic dejtor Montenegro 28 Apr 1996 (18)
Petar Milosavljevic ZipperMan Montenegro
Grover Enrique Castro Guzman vermen Peru 17 Jan 1992 (22)
Michał Glapa glapul Poland 01 Oct 1995 (18)
Albert Citko asterius Poland
João Rocha joaorocha619 Portugal
Pedro Amaro mys Portugal
Gonçalo Paredes gonP Portugal
Andrei Heidelbacher a_h1926 Romania 26 Aug 1995 (18) 2013 S
Rareș Darius Buhai rares.buhai Romania 18 May 1996 (18) 2012 G 2013 G
Alexandru Velea plus1.ironwood.branch Romania
Mihai-Dan Gheorghe gheorghemihai Romania 2011
Nikolay Kalinin KAN Russia 2013 G
Konstantin Semenov zemen Russia 2013 G
Nikita Uvarov dragonic Russia
Nikita Sivukhin Umqra Russia
Ivan Stošić ivan100sic Serbia 04 Sep 1995 (18) 2012 S 2013 S
Dimitrije Erdeljan didins Serbia 23 Apr 1997 (17) 2013 B
Marko Stanković MeinKraft Serbia 15 Jun 1996 (17) 2013 S
Andrej Ivašković Dreian95 Serbia 02 Apr 1995 (19) 2012
Feng Jiahai Singapore
Mark Theng Kwang Hui Singapore 2013 S
Xinyu Wu Singapore
Ranald Lam Yun Shao Singapore 2012 B 2013 S
Bui Truc Lam Slovakia
Mário Lipovský Slovakia
Michal Korbela kabell Slovakia
Eduard Batmendijn baklazan Slovakia 19 Jan 1996 (18) 2012 G 2013 G
Seokhwan Choi gs12117 South Korea 22 Dec 1996 (17) 2013 G
Jeehak Yoon cubelover South Korea 10 Feb 1998 (16)
Johan Sannemo jsannemo Sweden 2012 S 2013 S
Hussain Kara Falah blackjaguar97 Syria 14 Dec 1997 (16)
Hasan Jaddouh kingofnumbers Syria
Aleksandar Abas Alex7 Syria 13 Sep 1996 (17)
Joud Zouzou joudzouzou Syria
Brian Chen betaveros Taiwan
Yi Zhou qazwsxedcrfvtg14 Taiwan 03 Sep 1997 (16)
Pochang Chen johnchen902 Taiwan 05 Nov 1997 (16)
Tzu Peng Wang tzupengwang Taiwan 19 Sep 1996 (17)
Kai-Chieh Chang 551100kk Taiwan 2 25 Mar 1997 (17)
Abduqodiri Qurbonzoda abdukodir Tajikistan 2012 2013 B
Dzhamshed Khaitov Jamik Tajikistan 2012 2013
Mekhrubon Turaev Ximera Tajikistan 2013
Doro Umarov DARIUS_XIX Tajikistan 2013
Phoomraphee Luenam Phoom Thailand
Pichayut Liamthong pichayut Thailand 2013
Krittisak Chaiyakul toppykung Thailand 2013 B
Semih Basrık sbasrik Turkey 2013 S
Muhammed Emin Ayar eminayar Turkey 01 Aug 1997 (16)
Halil Ozan Akgül halilozanakgul Turkey 19 Jun 1996 (17)
Abdullah Enes Öncü enesoncu Turkey
Bayram Berdiyev bayram Turkmenistan
Bayram Guvanjov bayramg Turkmenistan
Sylap Aliyev sylap97 Turkmenistan 11 Nov 1997 (16) 2013
Andriy Omelyanenko Omelyanenko Ukraine 04 May 1997 (17)
Ilya Shevchenko Scorpy Ukraine 2013 B
Misha Babenko NegaTeef Ukraine
Andrej Selivanov seland Ukraine
Scott Wu scott_wu United States 2012 G 2013 G
Andrew He ecnerwal United States
Steven Hao stevenkplus United States 2013 S
Joshua Brakensiek AstroConjecture United States 2013 G
Kien Nguyen kien_coi_1997 Vietnam 30 Nov 1997 (16)
Phuc Ngo nhap96 Vietnam
Viet Do VVan Vietnam
Dung Nguyen ig_dug Vietnam
Countries 46
Participants 159

UPD 1 Please feel free to post the participants here too, so that there will be something to discuss :)
UPD 2 Now you can see IOI stats profile page of a participant :)
UPD 3 Congratulations! to those who qualified for IOI 2014 :)

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By accidentallygivenfuck, 5 years ago, In English,

I remember that I saw Barcelona 2014 Contest by Petr in CF Gym while taking a look at contests list in clist.by.
Does anyone know where is that contest now?

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