Problem 4; intermediate results, weeks 5,6

By 5th April 2020, there are 657 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. During the fifth week, 4 solutions were submitted, out of which 4 were correct. During the sixth week, 8 solutions were submitted all of which were correct.

Sixth week:

First NameSurnameSchool/UniversityCountryDate time
AlexandreBastosObjetivo IntegradoBrazil30/03/2004:49:00
JonathanGräfeTechnische Universität DresdenGermany30/03/2016:29:00
AlessandroMenegonColégio Objetivo IntegradoBrazil31/03/2005:31:00
Bayram AlpŞahinAnkara Sience HSTurkey31/03/2020:27:00
RobertoMarín DelgadoUniversidad de Costa Rica Costa Rica31/03/2023:04:00
ViníciusFerreira RodriguesColégio MasterBrazil01/04/2005:57:00
Sadman TahmidAliNotre Dame CollegeBangladesh02/04/2010:37:00
NikitaPoljakovUniversity of BristolUnited Kingdom05/04/2009:14:00

Fifth week:

First NameSurnameSchool/UniversityCountryDate time
Md. AnisurRahmanNotre Dame College Bangladesh 16/03/2010:00:00
HishamAlmalkiManarat Al-Riyadh SchoolSaudi Arabia21/03/2020:46:00
Imtiaz TanweerRahimNotre Dame CollegeBangladesh22/03/2010:28:00
Absur KhanSiamNotre Dame CollegeBangladesh22/03/2011:20:00

Fourth week:

First NameSurnameSchool/UniversityCountryDateTime
PanFeiyueThe High School of Anhui Normal UniversityChina15/03/202009:37

Third week:

First NameSurnameSchool/UniversityCountryDateTime
RonaldDobošGymnázium, Poštová 9, KošiceSlovakia01/03/2016:42:00
BatuhanKeskinBogazici UniversityTurkey03/03/2018:15:00
Deng JianzhengShenzhen Senior High SchoolChina05/03/2005:20:00

Second week:

First NameSurnameSchool/UniversityCountryDateTime
YuechenZhuHenan Experimental High SchoolChina24/02/2002:28:00
AntoniaGhitaInternational Computer High School of BucharestRomania29/02/2020:43:00
Duc HuyTran The Hong Kong University of Science and Technology Viet Nam01/03/2012:39:00

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 .