The fourth hint will be published on 23rd January, 13:00 GMT.
By 16th January 2022, 13:00 GMT, there are 1054 participants from 78 countries. 77 solutions to P2 were submitted, out of which 9 were correct.
Correct solutions by university students:
| First name | Surname | Country | School/University | P2 date time DD/MM/YY 00:00:00 |
| Zhening Li | Eddie Chen | Canada/United States | Massachusetts Institute of Technology | 20/12/2021 20:52:00 |
| Deng | Jinqiu | China | Beijing University of Aeronautics and Astronautics | 27/12/2021 04:13:00 |
| Shofar | Sno | Suriname | Anton de Kom University of Suriname | 29/12/2021 06:50:00 |
| Alessandro | Rezzi | Italy | University of Padova | 03/01/2022 19:23:00 |
| Jaroslav | Herman | Czech Republic | Charles University | 05/01/2022 15:46:00 |
| Ameya Vikrama | Singh | India | Indian Institute of Technology Bombay | 09/01/2022 20:02:00 |
| Isaac | Wu | Australia | University of Melbourne | 13/01/2022 17:07:00 |
Correct solutions by pre-university students:
| Vlad-Ștefan | Oros | Romania | “Grigore Moisil” Theoretical High School | 21/12/2021 06:22:00 |
| Luca | Milanese | Italy | Liceo “Leonardo da Vinci”, Terracina | 04/01/2022 11:58:00 |
The list of countries:
Algeria, Argentina, Australia, Azerbaijan, Bangladesh, Belarus, Belgique, Bosnia and Herzegovina, Brazil, Brunei Darussalam, Bulgaria, Canada, China, Costa Rica, Croatia, Czech Republic, Egypt, El Salvador, Estonia, Ethiopia, Finland, France, Georgia, Germany, Greece, Honduras, Hong Kong, Hungary, India, Indonesia, Iran, Israel, Italy, Japan, Kazakhstan, Korea, Kosovo, Kyrgyzstan, Latvia, Lebanon, Lithuania, Luxembourg, Macao, Malaysia, Mexico, Moldova, Mongolia, Nepal, Nigeria, North Macedonia, Pakistan, Peru, Philippines, Poland, Romania, Russia, Saudi Arabia, Serbia, Singapore, Slovakia, South Africa, Spain, Sri Lanka, Suriname, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Thailand, Turkey, Turkmenistan, Ukraine, United Kingdom, United States, Uzbekistan, Vietnam