By 15th March 2020, there are 652 registered participants from 68 countries (the list of countries is given below). For the Problem 4, during the first week, 33 solutions were submitted, out of which 10 were correct. During the second week, 12 solutions were submitted, out of which 3 were correct. During the third week, 6 solutions were submitted, out of which 3 were correct. During the fourth week, 3 solutions were submitted, out of which 1 was correct.
|Pan||Feiyue||The High School of Anhui Normal University||China||15/03/2020||09:37|
|Ronald||Doboš||Gymnázium, Poštová 9, Košice||Slovakia||01/03/20||16:42:00|
|Deng||Jianzheng||Shenzhen Senior High School||China||05/03/20||05:20:00|
|Yuechen||Zhu||Henan Experimental High School||Henan Experimental High School||24/02/20||02:28:00|
|Antonia||Ghita||International Computer High School of Bucharest||International Computer High School of Bucharest||29/02/20||20:43:00|
|Duc Huy||Tran||The Hong Kong University of Science and Technology (HKUST)||The Hong Kong University of Science and Technology||01/03/20||12:39:00|
|Zhaoyan||Pang||Harbin No.3 Senior High||China||16/02/20||14:58:00|
|Dobrica||Jovanović||Mathematical Grammar School||Serbia||16/02/20||15:34:00|
|Tung||Linh||Currently in gap yer||Vietnam||16/02/20||19:42:00|
|Quan||Nguyen||Hanoi-Amsterdam High School for the Gifted||Vietnam||17/02/20||14:18:00|
|Oliwier||Urbański||VII LO im. Dąbrówki w Poznaniu||Poland||18/02/20||22:26:00|
|Hanyi||Li||Chengdu Foreign Languages School||China||19/02/20||07:32:00|
|Endre||Bokor||Budapesti Fazekas Mihály Gyakorló Általános Iskola és Gimnázium||Hungary||22/02/20||21:37:00|
|Fang Tzu||Hsu||National Taiwan University||Taiwan||23/02/20||11:32:00|
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 .