Wait, why are there 'IOI participation' options up to 2014? Heck, you must be a genius to start participating in IOI since 2014, that is you must've been at leat 11 years old in your first participation :))

Just to note: a bunch of countries (including Israel) use APIO as a TST, don't expect most of the replies to arrive before May 23rd :p

Egypt:

• Ahmadsm2005 (Ahmad Said)

• Bakry (Mohamed Bakry)

• Osama_Alkhodairy (Osama Alkhodairy)

• zoooma13 (Hazem Issa)

Write your teams in the comments as well to keep the blog in recent actions :)

Italy:

There will be at least other 2 TSTs before choosing the IOI team.

Current top 10 (after 3 TSTs):

1. davi_bart — 934
2. Kaey — 890
3. Virv — 886.5
4. taulant — 881.5
5. rocks03 — 871.5
6. TheScrasse — 866
7. franfill — 807.5
8. armyalpaca — 805
9. lorenzoferrari — 803
10. Stypox — 754

After a year-long hiatus, we're back and brand new! Moldova:

• h4rdlyfunc710n4l (Mihai Spinei)
• FLEA (Victor Purice)
• Sho (Alexandru Andrei)
• (Stanislav Brega)

Good luck to them and to everyone!

South Africa:

• dolphingarlic (Andi Qu)
• EncryptingWolf (Jean Weight)
• JediMaster11 (Brent Butkow)
• FlippenFaz (Faran Steenkamp)

All of us have 0 attempts left.

Team Tunisia:

• StrawHatWess (Amine Oueslati)

• AmineTrabelsi (Amine Trabelsi)

• HediChehaidar (Hedi Chehaidar)

• GoldenCard (Louay Farah)

All with 1 attempt left

Bulgaria:

• Martin53 (Martin Kopchev)

• Sorting (Viktor Kozhuharov)

• donentseto (Andon Todorov)

• rumen_m (Rumen Mihov)

• iran's team
• ali safari Amoo_Safar
• alireza kaviani alireza_kaviani
• ali shahali AliShahali1382
• alireza keshavarz Keshi

Armenia:

• Arayi (Arayi Khalatyan)
• enoone (Aleksander Abelyan)
• EmilConst (Emil Kostanyan)
• insomaniac_ (Ani Khachatryan)

Canada:

• duality (Zixiang Zhou)
• thomas0115 (Thomas Guo)
• Dormi (Allen Pei)
• ChrisT (Chris Trevisan)

codeforces blog entry — IOI2021 China Team

idk about Topcoder. In AtCoder we have newbiedmy — Rewinding, that's so far as I know.

Um.. I believe the years for the medals are one year off...

Belarus:

• VEGAnn (Andrei Kastsiany)

• Enkognit (Stanislau Damasevich)

• _Time_Lord_ (Dzianis Lahunou)

• xyz. (Ilya Kuchynski)

Bangladesh: 1. TheeLooser 2. Farhan132 3. arman_ferdous 4. qwerty190

Kazakhstan :

• seduneon — Maksotov Zhambyl

• Mansur — Mukimbekov Mansur

• fractal — Ashurov Altair

• I_Love_Trott — Sakhmoldin Mukhammadarif

In your opinion who will win?

Mexico:

• joseacaz (Jose Angel Cazares Torres)
• ozy1220 (Alejandro Ozymandias Cepeda Beltran)
• Chaska (Victor Armando Jaramillo Moreno)
• Chyaru (Fernanda Sarahy Mancilla Nuñez)

Malaysia Team:

CSQ31 (Chew Shao Qian)

Nelson_loh (Nelson Loh Kwong Weng)

jeqcho (Chooi Je Qin)

MGod (Vee Hua Zhi)

Indonesia:

• Pyqe (Pikatan Arya Bramajati)
• rama_pang (Rama Aryasuta Pangestu)
• Berted (Edbert Geraldy Cangdinata)
• Pa.Nic (Nicholas Patrick)

Vietnam:

• atoiz — Huy Le Quang

• BJoozz — Bao Truong Van Quoc

• tahppp — Phat Ho Ngoc Vinh

• fhnal — Vu Nguyen Hoang

Out of curiosity, why is there only one person from the US? >.<

Palestine:

• _RED__ (Nicola AbuSaad)

• Satoru (Suhaib Sawalha)

• PalestinianTornado (Ruba Katout)

• Mohammed_Atalah (Mohammed Atalah)

Singapore (Team 1):

• errorgorn (Ashley Aragorn Khoo)
• shenxy13 (Shen Xing Yang)
• tqbfjotld (Tan Si Jie)
• kai824 (Tan Yi Kai)

Singapore (Team 2):

• oolimry (Lim Rui Yuan)
• l-yc (Li Yue Chen)
• jamessngg (Sng James Sun Jie)
• pavement (Yaw Chur Zhe)

French Team :

• Justin Cahuzac : JeanBombeur

• Charles Dai : oscar1f_will_win_IOI2024

• Alice Tosel : I_love_Michel_Sardou

• Oscar Fischler : oscar1f

Azerbaijan team:

• Aziz Huseynov — KalasLavas
• Said Nasibov — snasibov05
• Emin Orujov — E1e3
• Amin Jalilov — Collypso

Cuba Team:

MDario (Manuel Darío Oliver)

albertolg101 (Alberto Leyva)

Play_Erwan (Alain David Escarrá)

Platanito_Frito (Carlos Morell)

MDario and albertolg101 have 1 attept left.

Good luck to our team and to everyone.

Uzbekistan:

• Dilshodbek Khujaqulov DilshodbekX (2 attempts)
• Azimjon Urinov fff (0 attempts)
• Maqsut Yangiboyev gameOn_ (0 attempts)
• Asliddin Ismoilov Asliddin (2 attempts)

Team Israel:

• Gonen Gazit
• Yanir yanire Edri
• Lior lior5654 Yehezkely
• Yoav yoka255 Katz

All 0 attempts left.

After an intense battle — Team Turkey:

• erray — Cengiz Eray Aslan (3 attempts left)
• egekabas — Ege Kabasakaloglu (1 attempt left)
• usuyus — Yusuf Onur Usumez (1 attempt left)
• chromodynam1c — Olcay Oransoy (1 attempt left)

Team Turkmenistan

• Suleyman.A — Suleyman Atayev (0 attempt left)
  
• Gurban — Gurbanberdi Gulladyyev (1 attempt left)
  
• Dovran — Dovran Akmyradov (0 attempt left)
  
• Error_03 — Muhammetali Ashyrmuhammedov (0 attempt left)
  

Indian team:

• p-square (Pranjal Srivastava — 1 attempt left)
• kshitij_sodani (Kshitij Sodani — 3 attempts left)
• T1duS (Udit Sanghi — no attempts left)
• Everule (Aditya Jain — no attempts left)

Syria:

• ISeeDS (Mohammad Nour Massri)

• Corleones (Ali Mansour)

• Besher. (Besher Islambouley)

• A.D. (Antwan Dabbous)

All the best for our team and the rest of the teams :)

Spanish team:

• MeGustaElArroz23 Darío Martínez

• Farrius Óscar Garries

• Bernat Pagés

• Joan Cintas

Good luck to all the participants :)

[deleted]

Jordan:

Wesam — Wesam Naseer

Rayo -Malik Sadaqa

oora — noor al-shamayleh

SAAD- muhammad saad

Team Ireland:

• ScarletS Suneet Mahajan
• OisinDavey Oisín Davey
• JustAmethyst Ayushi Mahajan
• knightknight101 Benjamin Murray

The US team:

• frodakcin Siyong Huang
• timmyfeng Timothy Feng
• rainboy Rain Jiang
• rqi Richard Qi

Good luck at the IOI!

SriLanka:

• Sithija_A (Sithija Kotuwewatte)
• chirath2004nirodha (Chirath Nirodha)
• Lakshi4h (Lakshith Nishshanke)
• Apiram (Apiram Rajamohan)

Kyrgyzstan

• juggernaut (Daniyar Beishekeev), has 1 attempt left.
• HideoSatou (Islam Davletov), has 0 attempts left.
• kitsune (Tengiz Bekkoyonov), has 2 attempts left.
• dream_is_real (Artur Aidarov), has 0 attempts left.

Portugal:

• Tiago_Marques (Tiago Marques)
• Pbezz (Pedro Costa)
• RockSnow (António Neves)
• TFF (Tomás Faria)

IOI 2021 data has been released on IOI Stats.

I'll try to add Codeforces handles from kostka's list at some point.