PC2021: Intermediate results, Problem 3, week 4

By 28th March 2021, there are 1009 registered participants from 71 countries (the list of countries is given below). During the first four weeks, 42 solutions were submitted, out of which 12 were correct.

Correct solutions were submitted by:

First NameSurnameCountrySchool/Universitydatetime
ZheningLiCanadaSir John A. Macdonald Secondary School28/02/2120:37
HuiyuanWangChinaUniversity of Cambridge01/03/2108:56
YuechenZhuChinaPeking University01/03/2115:22
LotusChenChinaNo.2 High School Shijiazhuang01/03/2115:39
NikitaSemeninRussiaMoscow Institute of Physics and Technology01/03/2117:56
OliwierUrbańskiPolandLiceum Ogólnokształcące nr 7 w Poznaniu02/03/2114:11
EddieChenUnited StatesWest-Windsor Plainsboro High School North06/03/2102:05
QianLinChinaUniversity of Oxford11/03/2123:47
YanjunZhouUnited KingdomUniversity of Oxford16/03/2106:26
AntoniaGhitaRomaniaInternational Computer High School of Bucharest17/03/2108:43
JieWangChinaZhangjiakou No.1 Middle School24/03/2103:11
Ameya VikramaSinghIndiaFIITJEE Junior College25/03/2108:20

Participating countries: Algeria, Azerbaijan, Australia, Bangladesh, Belarus, Belgium, Bosnia and Herzegovina, Bolivia, Brazil, Bulgaria, Cambodia, Canada, China, Croatia, Czechia, Egypt, El Salvador, Estonia, Finland, Georgia, Germany, Greece, Hungary, India, Indonesia, Iran, Israel, Italy, Japan, Kazakhstan, Kenya, Korea, Kyrgyzstan, Latvia, Lebanon, Lithuania, Macedonia, Malaysia, Mexico, Moldova, Mongolia, Nepal, Nigeria, North Macedonia, Pakistan, Peru, Philippines, Poland, Romania, Russia, Saudi Arabia, Serbia, Singapore, Slovakia, Slovenia, South Africa, South Korea, Spain, Sri Lanka, Sweden, Switzerland, Syria, Taiwan, Thailand, Turkey, Turkmenistan, United Arab Emirates, United Kingdom, United States, Uzbekistan, Vietnam.