XXIII IOI Contestants.
| # | Name | Country | TopCoder | IOI2010 | IOI2009 | IOI2008 | IOI2007 | IOI2006 |
|---|
| 1 | Ledio Berdellima | Albania | | + | | | | |
| 2 | Mikele Shtembari | Albania | | | | | | |
| 3 | Teodor Rupi | Albania | | | | | | |
| 4 | Lucas Agudiez | Argentina | | | | | | |
| 5 | Lucas Tavolaro Ortiz | Argentina | Tavo92 | + | + | | | |
| 6 | Federico Martin Ravchina | Argentina | | | | | | |
| 7 | Isaias Emanuel Brunet | Argentina | | | | | | |
| 8 | Eduard Grigoryan | Armenia | edogrigqv2 | + | | | | |
| 9 | Armen Vardanyan | Armenia | MrArmenV | + | | | | |
| 10 | Robert Davtyan | Armenia | | | | | | |
| 11 | Tigran Mamikonyan | Armenia | | | | | | |
| 12 | Evgeny Martynov | Australia | | Bronze | Bronze | | | |
| 13 | Robert Newey | Australia | | + | | | | |
| 14 | Michael Shiquan Chen | Australia | | | | | | |
| 15 | Eliot Daniel Courtney | Australia | | | | | | |
| 16 | Fabian Hammerie | Austria | | + | | | | |
| 17 | Markus Hasenohrl | Austria | | | | | | |
| 18 | Thomas Tangl | Austria | | | | | | |
| 19 | Sebastian Wagner | Austria | | | | | | |
| 20 | Azad Salahli | Azerbaijan | | | | | | |
| 21 | Rashid Gaziyev | Azerbaijan | | | | | | |
| 22 | Ali Karimli | Azerbaijan | | | | | | |
| 23 | Tahir Ali-Zade | Azerbaijan | | | | | | |
| 24 | Fahim Zubayer | Bangladesh | fahim_zubayer | | | | | |
| 25 | Bristy Skider | Bangladesh | | | | | | |
| 26 | Gennady Korotkevich | Belarus | tourist | Gold(1) | Gold(1) | Gold | Gold | Silver |
| 27 | Adam Bardashevich | Belarus | subscriber | | | | | |
| 28 | Siarhei Kulik | Belarus | xcwgf666 | | | | | |
| 29 | Uladzislau Padtsiolkin | Belarus | vlad10795 | | | | | |
| 30 | Benoit Legat | Belgium | | + | | | | |
| 31 | Victor Lecomte | Belgium | | | | | | |
| 32 | Laurens Dewaele | Belgium | | | | | | |
| 33 | Floris Kint | Belgium | | | | | | |
| 34 | Damir Ferizovic | Bosnia and Herzegovina | Amtrix | Bronze | + | | | |
| 35 | Daniel Ferizovic | Bosnia and Herzegovina | Apofis | + | | | | |
| 36 | Asmir Avdicevic | Bosnia and Herzegovina | | | | | | |
| 37 | Hajrudin Coralic | Bosnia and Herzegovina | | | | | | |
| 38 | Caique Lira | Brazil | | + | | | | |
| 39 | Marcos Massayuki Kawakami | Brazil | | | | | | |
| 40 | Renato Ferreira Pinto Junior | Brazil | | Bronze | + | | | |
| 41 | Felipe Abella Souza | Brazil | | Silver | Silver | | | |
| 42 | Vladislav Haralampiev | Bulgaria | v.haralampiev | Gold | | | | |
| 43 | Rumen Hristov | Bulgaria | exod40 | Gold(2) | Silver | Silver | | |
| 44 | Yordan Chaparov | Bulgaria | danch0 | | | | | |
| 45 | Georgi Georgiev | Bulgaria | gogokefakefa | | | | | |
| 46 | Cyril Zhang | Canada | cyril | + | | | | |
| 47 | Daniel Hui | Canada | | | | | | |
| 48 | Ziting Yu | Canada | | | | | | |
| 49 | Kevin Yeo | Canada | | | | | | |
| 50 | Haoqiang Fan | China | | | | | | |
| 51 | Erjin Zhou | China | zhouerjin | | Silver | | | |
| 52 | Yichao Zhou | China | | | | | | |
| 53 | Zhongtian Jiang | China | oioi98 | | | | | |
| 54 | Jui-Min Lee | Chinese Taipei | | Silver | | | | |
| 55 | Meng-Huan Yu | Chinese Taipei | | | | | | |
| 56 | Po-Cheng Chu | Chinese Taipei | | | | | | |
| 57 | Shin-Wei Liu | Chinese Taipei | | | | | | |
| 58 | Rafael Mantilla | Colombia | rjmantilla | Bronze | Bronze | Bronze | | |
| 59 | Diego Niquefa | Colombia | niquefa_diego | + | | | | |
| 60 | Jaime Silva | Colombia | silvavelosa | + | + | | | |
| 61 | Diego Caballero | Colombia | DiegoCR | | | | | |
| 62 | Ivan Katanic | Croatia | ikatanic | Silver | | | | |
| 63 | Ivica Kicic | Croatia | ikicic | Gold | | | | |
| 64 | Gustav Matula | Croatia | syntax_error | | nbsp; | | | |
| 65 | Matija Milisic | Croatia | mmilisic | | | | | |
| 66 | Marios Hadjimichael | Cyprus | | + | | | | |
| 67 | Ioanna Mousikou | Cyprus | | + | | | | |
| 68 | Elias Galiounas | Cyprus | | | | | | |
| 69 | Antonis Pishias | Cyprus | | | | | | |
| 70 | Hynek Jemelik | Czech Republic | Hynek | Gold | Bronze | | | |
| 71 | Lukas Folwarczny | Czech Republic | Folwar | | | | | |
| 72 | Filip Hlasek | Czech Republic | fhlasek; | | | | | |
| 73 | Jakub Zika | Czech Republic | | | | | | |
| 74 | Esben Andersen Sorig | Denmark | | | | | | |
| 75 | Jeppe Bjorn Hallgren | Denmark | | | | | | |
| 76 | Jakob Tejs Knudsen | Denmark | | | | | | |
| 77 | Svend Christian Svendsen | Denmark | | | | | | |
| 78 | Omar ElAzazy | Egypt | oa12gb | Silver | Bronze | + | | |
| 79 | Ahmed Salem Ezzat | Egypt | mrtempo | + | Bronze | Bronze | | |
| 80 | Emad Farag William | Egypt | EmadWilliam | Silver | Bronze | + | | |
| 81 | Ahmed Mohammed Kamel | Egypt | ahm.kam_92 | | | | | |
| 82 | Ago Allikmaa | Estonia | | + | | | | |
| 83 | Ants Remm | Estonia | | | | | | |
| 84 | Karl-Aksel Puulmann | Estonia | | | | | | |
| 85 | Jaagup Repan | Estonia | | Bronze | + | | | |
| 86 | Jasse Lahdenpera | Finland | | | | | | |
| 87 | Andrei Cramariuc | Finland | | | | | | |
| 88 | Johannes Laire | Finland | | Silver | | | | |
| 89 | Janne Levijoke | Finland | | | | | | |
| 90 | Masaki Hara | Japan | qnighy | Gold | | | | |
| 91 | Kensuke Imanishi | Japan | wrong | Silver | | | | |
| 92 | Shogo Murai | Japan | semiexp | Gold(9) | | | | |
| 93 | Shinya Shiroshita | Japan | | | | | | |
| 94 | Ali-Amir Aldan | Kazakhstan | ZoRGaN | Bronze | | | | |
| 95 | Ali Dautalinov | Kazakhstan | | Bronze | + | | | |
| 96 | Vyacheslav Kim | Kazakhstan | imslavko | | | | | |
| 97 | Madi Khamitbekov | Kazakhstan | Kh.Madi | | | | | |
| 98 | Myungwoo Chun | Korea | myungwoo | Bronze | | | | |
| 99 | Hoseok Ryu | Korea | | | | | | |
| 100 | Seung Yong Lee | Korea | wdyd2004 | | | | | |
| 101 | Taegyu Lee | Korea | | | | | | |
| 102 | Talal Mohammad Alsheqaih | Kuwait | | + | | | | |
| 103 | Yaqoub Adel Alyakoob | Kuwait | | | | | | |
| 104 | Muhsen Hazem Saleh | Kuwait | | | | | | |
| 105 | Khaled Mohammad Alhendi | Kuwait | | | | | | |
| 106 | Shakarim Kalandarov | Kyrgyzstan | | | | | | |
| 107 | Mederbek Begmatov | Kyrgyzstan | Meder | | | | | |
| 108 | Nurdoolot Aitaliev | Kyrgyzstan | | | | | | |
| 109 | Sultanbek Baibagyshev | Kyrgyzstan | sultanbek93 | | | | | |
| 110 | Eduards Kalinicenko | Latvia | eduardische | Silver | Silver | Bronze | | |
| 111 | Eriks Gopaks | Latvia | Epiq | | | | | |
| 112 | Aleksejs Popovs | Latvia | | | | | | |
| 113 | Karlis Senko | Latvia | Kazook | | | | | |
| 114 | Karolis Greblikas | Lithuania | | | | | | |
| 115 | Marijonas Petrauskas | Lithuania | | Silver | + | | | |
| 116 | Ignas Rudaitis | Lithuania | | | | | | |
| 117 | Kestutis Vilcinskas | Lithuania | | Bronze | | | | |
| 118 | Gilles Englebert | Luxembourg | | + | | | | |
| 119 | Pol Roger Albert Welter | Luxembourg | | | | | | |
| 120 | Jerome Eric Urhausen | Luxembourg | | | | | | |
| 121 | Jeff Wagner | Luxembourg | | + | + | | | |
| 122 | Chin Seng Fu | Macao | | | | | | |
| 123 | Lei Hou Hoi | Macao | | + | | | | |
| 124 | Sek Hou Leong | Macao | | | | | | |
| 125 | Chou Lun Leong | Macao | | + | | | | |
| 126 | Hristijan Bogoevski | Macedonia | birbbit | + | + | | | |
| 127 | Dejan Bozhinovski | Macedonia | dejanb | | | | | |
| 128 | Predrag Gruevski | Macedonia | obi1kenobi | Bronze | | | | |
| 129 | Jovan Krajevski | Macedonia | jovank | + | | | | |
| 130 | Alain Acevedo | Mexico | | | | | | |
| 131 | Ethan Jimenez | Mexico | ErosEthan | | | | | |
| 132 | Saul Gutierrez | Mexico | Heruman312 | + | | | | |
| 133 | Flavio Hernandez | Mexico | | + | + | | | |
| 134 | Victor Ciuntu | Moldova | | + | | | | |
| 135 | Ion Caliman | Moldova | | | | | | |
| 136 | Andrian Moroi | Moldova | | | | | | |
| 137 | Nicusor Chiciuc | Moldova | | | | | | |
| 138 | Janchiv Bat-Erdene | Mongolia | janchiv | + | | | | |
| 139 | Gantushig Bayasgalan | Mongolia | gantushig | + | | | | |
| 140 | Byambadorj Puntsag | Mongolia | ByambadorjP_tc | | | | | |
| 141 | Naranbayar Uuganbayar | Mongolia | naranbayar_mon | + | + | | | |
| 142 | Kosta Pavlovic | Montenegro | | | | | | |
| 143 | Luka Bulatovic | Montenegro | | | | | | |
| 144 | Vuk Pejovic | Montenegro | | | | | | |
| 145 | Lazar Radinovic | Montenegro | | | | | | |
| 146 | Bas Nieuwenhuizen | Netherlands | | Silver | | | | |
| 147 | Patrick Kostjens | Netherlands | | | | | | |
| 148 | Jorrit Dorrestijn | Netherlands | | | | | | |
| 149 | Kees Ligtenberg | Netherlands | | | | | | |
| 150 | Logan Glasson | New Zealand | | Bronze | | | | |
| 151 | Jamie McCloskey | New Zealand | | Bronze | Bronze | + | | |
| 152 | Tom Levy | New Zealand | | | | | | |
| 153 | Tony Sun | New Zealand | | + | | | | |
| 154 | Salihi Abdullahi | Nigeria | | | | | | |
| 155 | Yahya Umar Bindir | Nigeria | | | | | | |
| 156 | Aghogho Premobowei Etibo | Nigeria | | | | | | |
| 157 | Alexander Abu Benjamin | Nigeria | | | | | | |
| 158 | Jonas Irgens Kylling | Norway | | | | | | |
| 159 | Julian Jark | Norway | | | | | | |
| 160 | Jonas Sandberg | Norway | | | | | | |
| 161 | Jan Milczek | Poland | | Silver | | | | |
| 162 | Krzysztof Leszczynski | Poland | | | | | | |
| 163 | Piotr Karol Bejda | Poland | | | | | | |
| 164 | Lukasz Jocz | Poland | | | | | | |
| 165 | Pedro Paredes | Portugal | | | | | | |
| 166 | Rodrigo Gomes | Portugal | | + | | | | |
| 167 | Mauro Mesquita | Portugal | | | | | | |
| 168 | Afonso Santos | Portugal | | | | | | |
| 169 | Vlad Gavrila | Romania | VladGavrilla | Bronze | | | | |
| 170 | Adrian Budau | Romania | freak93 | | | | | |
| 171 | Andrei Purice | Romania | Andip | | | | | |
| 172 | Mihai-Dan Gheorghe | Romania | gheorghemihai | | | | | |
| 173 | Egor Suvorov | Russian Federation | yeputons | | | | | |
| 174 | Alexander Timin | Russian Federation | AlTimin | | | | | |
| 175 | Pavel Kunyavskiy | Russian Federation | kuniavski | | | | | |
| 176 | Dmitry Egorov | Russian Federation | Dmitry_Egorov | | | | | |
| 177 | Boris Grubic | Serbia | boris.grubic | Bronze | | | | |
| 178 | Nikola Smiljkovic | Serbia | Smiljko | | | | | |
| 179 | Dusan Zdravkovic | Serbia | DuXSerbia | Bronze | | | | |
| 180 | Aleksa Stankovic | Serbia | | | | | | |
| 181 | Zhan Xiong Chin | Singapore | | Silver | Silver | Bronze | | |
| 182 | Seng Ing Raymond Kang | Singapore | | Gold | | | | |
| 183 | Chuanqi Shen | Singapore | | Bronze | | | | |
| 184 | Hua Kian Hubert Teo | Singapore | | | | | | |
| 185 | Marian Hornak | Slovakia | | | | | | |
| 186 | Matej Balog | Slovakia | | Bronze | | | | |
| 187 | Jan Hozza | Slovakia | | Silver | | | | |
| 188 | Michal Anderle | Slovakia | | | | | | |
| 189 | Ernest Belicic | Slovenia | | | | | | |
| 190 | Klemen Kloboves | Slovenia | | + | | | | |
| 191 | Matjaz Leonardis | Slovenia | | + | | | | |
| 192 | Jure Slak | Slovenia | | | | | | |
| 193 | Kieren Paul Davies | South Africa | | | | | | |
| 194 | Vaughan Robert Newton | South Africa | | | | | | |
| 195 | Yaseen Hamdulay | South Africa | | | | | | |
| 196 | Benjamin Dawid Swart | South Africa | | | | | | |
| 197 | Ferran Alet | Spain | ferry | + | | | | |
| 198 | David Balaghi | Spain | dirbaio | + | | | | |
| 199 | Ezequiel Santamaria | Spain | | | | | | |
| 200 | Dario Nieuwenhuis | Spain | Sorington | Bronze | | | | |
| 201 | Navin Gunathillaka | Sri Lanka | | + | + | | | |
| 202 | Yasith Lahiru Vidanaarachchi | Sri Lanka | | | | | |
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| 203 | Rajith Yashodha Vidanaarachchi | Sri Lanka | | | | | |
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| 204 | Anton Grensjo | Sweden | | | | | | |
| 205 | Emil Lenngren | Sweden | | + | | | | |
| 206 | Marten Wiman | Sweden | | | | | | |
| 207 | Jonas Olsson | Sweden | | + | | | | |
| 208 | Nikola Djokic | Switzerland | | | | | | |
| 209 | Stefan Lippuner | Switzerland | | | | | | |
| 210 | Lasar Todorovic | Switzerland | | | | | | |
| 211 | Cyril Frei | Switzerland | | | | | | |
| 212 | Haidar Kamal Abboud | Syria | | + | | | | |
| 213 | Abdulbaset Hassan Aljoudi | Syria | | | | | | |
| 214 | Kinan Mamoon Al Sarmini | Syria | Sarkin | Bronze | + | | | |
| 215 | Wael Abd Munem Amayri | Syria | | | | | | |
| 216 | Ulugbek Kurbonov | Tajikistan | | | | | | |
| 217 | Mikhail Panyavin | Tajikistan | | + | | | | |
| 218 | Akramzhon Azamov | Tajikistan | | | | | | |
| 219 | Shidfar Khadi-Zade | Tajikistan | | | | | | |
| 220 | Pasin Manurangsi | Thailand | pasin30055 | Gold | Silver | | | |
| 221 | Laphonchai Jirachuphun | Thailand | | | | | | |
| 222 | Witchakorn Kamolpornwijit | Thailand | chalet16 | | | | | |
| 223 | Sorawit Suriyakarn | Thailand | psint | | | | | |
| 224 | Veerakan Sinthaveelertmongkol | Thailand2 | | Silver | | | | |
| 225 | Varot Premtoon | Thailand2 | | | | | | |
| 226 | Worapat Jarangkul | Thailand2 | | | | | | |
| 227 | Jirayu Luewetwanit | Thailand2 | | | | | | |
| 228 | Baris Kaya | Turkey | yenizelanda | Silver | Silver | | | |
| 229 | Bugrahan Sahin | Turkey | bugrahan | Bronze | | | | |
| 230 | Abdullah Alperen | Turkey | | | | | | |
| 231 | Erman Koseoglu | Turkey | | | | | | |
| 232 | Merdan Gurbangylyjow | Turkmenistan | | | | | | |
| 233 | Muhammet Hudayberdiyev | Turkmenistan | | | | | | |
| 234 | Amangeldi Meretgylyjow | Turkmenistan | | | | | | |
| 235 | Dovran Nurgeldiyev | Turkmenistan | | | | | | |
| 236 | Andrii Kashyn | Ukraine | IIoTeP9HuY | | | | | |
| 237 | Andrii Makar | Ukraine | Andrew_Makar | | | | | |
| 238 | Sergii Nagin | Ukraine | Sereja | + | | | | |
| 239 | Yevgen Vasyliv | Ukraine | yvasyliv | Silver | | | | |
| 240 | Sultan Abdullah Alshehhi | United Arab Emirates | | | | | | |
| 241 | Arif Ismail Alrais | United Arab Emirates | | | | | | |
| 242 | Rashed Haroon Saleh | nited Arab Emirates | | | | | | |
| 243 | Rashid Ali Abdulrahman | United Arab Emirates | | | | | | |
| 244 | Sean Quah | United Kingdom | | | | | | |
| 245 | Robin George Lee | United Kingdom | | | | | | |
| 246 | Diggory James Joshua Blake | United Kingdom | | Bronze | | | | |
| 247 | Cheng Sun | United Kingdom | | | | | | |
| 248 | Wenyu Cao | United States | wcao | Gold(4) | Silver | | | |
| 249 | Albert Gu | United States | Ubemaya | | | | | |
| 250 | Johnny Ho | United States | random.johnnyh | | | | | |
| 251 | Nathan Pinsker | United States | generic_user | | | | | |
| 252 | Eduardo Jose Moreno Correa | Venezuela | | | | | | |
| 253 | Rafael Agustin Perez Mendoza | Venezuela | | + | | | | |
| 254 | Johnatan Ernesto Gonzalez Rodas | Venezuela | | | | | | |
| 255 | Ricardo Jose Tovar Montero | Venezuela | | + | | | | |
| 256 | Linh Vuong Nguyen | Vietnam | ll931110 | | | | | |
| 257 | Sy Nguyen Tan Nguyen | Vietnam | flashmt | | | | | |
| 258 | Yen Hoang Nguyen | Vietnam | | | | | | |
| 259 | Minh Tue Khac Le | Vietnam | technolt | | | | | |
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