By the end of the fifth week, there are 578 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.
| 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 |
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 .