By 23rd February 2020, there are 631 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.
|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 .