By 22nd March 2020, there are 654 registered participants from 68 countries (the list of countries is given below). For the Problem 45 during the first week, 18 solutions were submitted, out of which 14 were correct.
First week:
| First Name | Surname | School/University | Country | Date | Time |
| Duc Huy | Tran | The Hong Kong University of Science and Technology (HKUST) | Viet Nam | 15/03/20 | 17:23:00 |
| Antonia | Ghita | International Computer High School of Bucharest | Romania | 15/03/20 | 23:16:00 |
| Dobrica | Jovanović | Mathematical Grammar School | Serbia | 16/03/20 | 08:36:00 |
| Tevž | Lotrič | Gimnazija Kranj | Slovenia | 16/03/20 | 13:58:00 |
| Tung | Linh | Currently in gap yer | Vietnam | 16/03/20 | 20:41:00 |
| Fang Tzu | Hsu | National Taiwan University | Taiwan | 17/03/20 | 02:08:00 |
| Hanyi | Li | Chengdu Foreign Languages School | China | 17/03/20 | 04:30:00 |
| Imtiaz Tanweer | Rahim | Notre Dame College | Bangladesh | 17/03/20 | 09:18:00 |
| Zhaoyan | Pang | Harbin No.3 Senior High | China | 17/03/20 | 15:46:00 |
| Oliwier | Urbański | VII LO im. Dąbrówki w Poznaniu | Poland | 18/03/20 | 15:49:00 |
| Pan | Feiyue | The High School of Anhui Normal University | China | 21/03/20 | 09:45:00 |
| Roberto | Marín Delgado | Universidad de Costa Rica | Costa Rica | 21/03/20 | 21:53:00 |
| Absur Khan | Siam | Notre Dame College | Bangladesh | 22/03/20 | 07:00:00 |
| Timothy | Ho | NUS High School of Mathematics and Science | Singapore | 22/03/20 | 10:44:00 |
Participating countries: Australia, Azerbaijan, Bahrain, Bangladesh, Belarus , Bosnia and Herzegovina, Brasil, Bulgaria, Cambodia, Canada, China, Chinese Taipei, 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 .