By the end of the seventh week, there are 589 registered participants from 67 countries (the list of countries is given below). For the Problem 2, during the first week, 19 solutions were submitted, out of which 5 were correct. During the second week, 11 more solutions were submitted, out of which 2 were correct. During the third week, 6 more solutions were submitted, but none of these were correct. During the fourth week, 16 more solutions were submitted, out of which 5 were correct.
Week 1.
| First Name | Surname | School/University | Country | date | time |
| Tevž | Lotrič | Gimnazija Kranj | Slovenia | 15/12/19 | 15:03 |
| Oliwier | Urbański | VII LO im. Dąbrówki w Poznaniu | Poland | 17/12/19 | 15:23 |
| Duc Huy | Tran | The Hong Kong University of Science and Technology | Viet Nam | 18/12/19 | 16:15 |
| Tung | Linh | Currently in gap yer | Viet Nam | 19/12/19 | 19:27 |
| Antonia | Ghita | International Computer High School of Bucharest | Romania | 20/12/19 | 21:38 |
Week 2.
| First Name | Surname | School/University | Country | date | time |
| Roberto | Marín Delgado | Universidad de Costa Rica | Costa Rica | 22/12/19 | 19:12:00 |
| Tan | Nguyen | Vietnam National University | Vietnam | 25/12/19 | 03:59:00 |
Week 4.
| First Name | Surname | School/University | Country | date | time |
| Jerry | Han | Raffles Institution | Singapore | 06/01/20 | 08:23:00 |
| Hanyi | Li | Chengdu Foreign Languages School | China | 06/01/20 | 09:13:00 |
| Yuechen | Zhu | Henan Experimental High School | China | 06/01/20 | 09:24:00 |
| Oliver | Lindström | KTH | Sweden | 07/01/20 | 16:02:00 |
| Trang Đào | Công Minh | HUS High School for Gifted Student | Viet Nam | 09/01/20 | 13:57:00 |
| Zhaoyan | Pang | Harbin No.3 Senior High | China | 19/01/20 | 12:26:00 |
Participating countries: Australia, Azerbaijan, Bahrain, Bangladesh, Belarus , Bosnia and Herzegovina, Brasil, Bulgaria, Cambodia, Canada, China, Costa Rica, Croatia, Ecuador, Egypt, El Salvador, Estonia, Finland, France, Georgia, Germany, Greece, Hong Kong, Hungary, India, Indonesia, Italy, Japan, Kazakhstan, Korea, Kosovo, Kyrgyzstan, Latvia, Lithuania, Luxembourg, Macedonia (North), Malaysia, Mexico, Moldova, Mongolia, Morocco, Nepal, Netherlands, Nigeria, Pakistan, Peru, Philippines , Poland, Portugal, Romania, Russia, Saudi Arabia, Serbia, Singapore, Slovakia, Slovenia, Sweden, Switzerland, Syria, Tajikistan, Thailand, Turkey, Turkmenistan, United Kingdom, United States, Uzbekistan, Vietnam .