Problem 4; intermediate results, week 1

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.

First week:

NameSurnameSchool/UniversityCountryDate time
ZhaoyanPangHarbin No.3 Senior HighChina16/02/2014:58:00
DobricaJovanovićMathematical Grammar School Serbia16/02/2015:34:00
TungLinhCurrently in gap yerVietnam16/02/2019:42:00
TevžLotričGimnazija KranjSlovenia16/02/2021:34:00
QuanNguyenHanoi-Amsterdam High School for the GiftedVietnam17/02/2014:18:00
JohanesSuhardjoHKUSTIndonesia18/02/2008:54:00
OliwierUrbańskiVII LO im. Dąbrówki w PoznaniuPoland18/02/2022:26:00
HanyiLiChengdu Foreign Languages SchoolChina19/02/2007:32:00
EndreBokorBudapesti Fazekas Mihály Gyakorló Általános Iskola és GimnáziumHungary22/02/2021:37:00
Fang TzuHsuNational Taiwan UniversityTaiwan23/02/2011:32:00

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 .