PC2021: Intermediate results, Problem 2, week 3

By 21st February 2021, there are 992 registered participants from 71 countries (the list of countries is given below). During the first three weeks, 128 solutions were submitted, out of which 80 were correct.

Correct solutions were submitted by:

First Name	Surname	Country	School/University	date	time
Thanadis	Charoenrujijin	Thailand	Suankularb Wittayalai School	31/01/21	13:59
Nikita	Semenin	Russia	Moscow Institute of Physics and Technology	31/01/21	14:29
Manh Quan	Nguyen	Vietnam	Hanoi – Amsterdam High School for the Gifted	31/01/21	14:39
Eddie	Chen	United States	West-Windsor Plainsboro High School North	31/01/21	14:41
Bayram Alp	Şahin	Turkey	Ankara Science HS	31/01/21	14:56
Arhaan	Ahmad	India	Krishna Public School	31/01/21	16:27
Zhening	Li	Canada	Sir John A. Macdonald Secondary School	31/01/21	17:45
Cristiana Andreea	Murgoci	Romania	International Computer Highschool of Bucharest	31/01/21	17:49
Vlad-Ștefan	Oros	Romania	“Grigore Moisil” Informatics High School	31/01/21	18:54
Absur Khan	Siam	Bangladesh	Notre Dame College	31/01/21	20:03
Huiyuan	Wang	China	University of Cambridge	31/01/21	22:48
Pieter	Van Steenweghen	Belgium	Imperial College London	31/01/21	23:18
Vuk	Hip	Serbia	Mathematical grammar school	31/01/21	23:21
Dušan	Beguš	Serbia	Mathematical Grammar School	31/01/21	23:44
Fang Tzu	Hsu	Taiwan	National Taiwan University	01/02/21	01:36
Wesley Antonio	Machado Andrade de Aguiar	Brazil	Military School of Manaus	01/02/21	03:59
Lotus	Chen	China	No.2 High School Shijiazhuang	01/02/21	06:22
Jiaxi	Su	China	NO.1 Middle School attached to Central China Normal University	01/02/21	09:21
Minh	Trang Dao	VietNam	Hus highschool for gifted students	01/02/21	10:07
Yuechen	Zhu	China	Peking University	01/02/21	10:41
Janis	Huns	Latvia	University of Cambridge	01/02/21	11:16
Ameya	Deshmukh	India	St. Joseph’s Convent High School	01/02/21	15:11
Anant	Lunia	India	Delhi Public School RK Puram	01/02/21	21:56
Qian	Lin	China	University of Oxford	01/02/21	22:39
Je Qin	Chooi	Malaysia	Kolej Tuanku Ja’afar	02/02/21	02:43
Jianzheng	Deng	China	Shenzhen Senior High School	02/02/21	02:52
Joshua	Teo	Singapore	NUS High School	02/02/21	08:28
Anastasia	Pozharkova	Russia	MBOU “Gymnasium 91 named after M. V. Lomonosov”	02/02/21	11:36
Xuanyu	Lin	China	Shenzhen Foreign Languages School	02/02/21	14:53
Oliwier	Urbański	Poland	Liceum Ogólnokształcące nr 7 w Poznaniu	03/02/21	12:23
Yu	Lu	China	Suzhou High School of Jiangsu Province	03/02/21	15:12
Batuhan	Keskin	Turkey	Boğazici University	03/02/21	18:03
Sangyul	Lee	Korea	Seoul National University	03/02/21	18:42
Prakhar	Singh	India	IIT Kanpur	04/02/21	07:07
Tevž	Lotrič	Slovenia	University of Oxford	04/02/21	09:27
Gia Hiển	Nguyễn	VietNam	HUS High School for Gifted Students	04/02/21	12:33
Pritesh	Mehta	India	Allen	04/02/21	18:04
József	Gurzó	Hungary	Budapesti Fazekas Mihály Gyakorló Általános Iskola és Gimnázium	04/02/21	19:17
M. Subhi	Abo Rdan	Syria	Knowledge private schools	05/02/21	18:45
Arturo Francisco Ruiz	Mercado	Bolivia	Hno. Felipe Palazón	05/02/21	21:27
Balázs	Kovács	Hungary	Hatvani Bajza József Gimnázium	05/02/21	22:30
Dmitry	Khvatov	Russia	Lyceum “Vorobyovy gory”	06/02/21	18:21
Martin	Vassilev	Bulgaria	SMG “Paisii Hilendarski”	07/02/21	09:52
Deng	Jinqiu	China	Guangdong Experimental High School	06/02/21	10:58
Adam	Džavoronok	Slovakia	Gymnázium Poštová 9	07/02/21	19:18
Cristian	Ardeleanu	Romania	International Computer High School Bucharest	09/02/21	15:24
Hugo	Bäckman	Sweden	Chalmers University	09/02/21	22:15
Sebastián Andrés	Arévalo Aguirre	El Salvador	Instituto Emiliani	10/02/21	13:37
Duta	Kartvelishvili	Georgia	LEPL Kutaisi Phys. Math. Public School N41	10/02/21	16:09
Abdullah	AlHussni	Syria	Al Saade HS, Syria	11/02/21	22:30
Caio Augusto	Siqueira da Silva	Brazil	Colégio Objetivo Integrado	12/02/21	04:46
Elio	Moreau	Italy	École Polytechnique Fédérale de Lausanne	12/02/21	16:58
Alessandro	Rezzi	Italy	University of Padova	13/02/21	11:51
Ricards	Knipsis	Latvia	University of Manchester	13/02/21	14:11
Timothy	Ho	Singapore	Gap Year	13/02/21	15:06
Nithesh	Sanjeevi Saravanan	Singapore	In gap year	13/02/21	17:30
Phatthanon	Pattanakanvijit	Thailand	Suankularb Wittayalai School	13/02/21	18:41
Gigi	Tsirekidze	Georgia	LEPL Kutaisi Phys. Math. Public School N41	13/02/21	18:50
Jaroslav	Herman	Czechia	Charles University, Prague	13/02/21	22:02
Abdalazeez	Jerby	Syria	Al-Basel high school	14/02/21	00:35
Sarthak	Panda	India	Fiitjee Bhubaneswar	14/02/21	05:00
Gyan Seah;	TJ Wei & P Seow	Singapore	NUS High School of Mathematics and Science	14/02/21	08:48
Antonia	Ghita	Romania	International Computer High School of Bucharest	14/02/21	12:15
Daoxin	Zhong	Singapore	University of Oxford	15/02/21	00:02
Minh Hoàng	Lê	VietNam	HUS High School for Gifted Students	15/02/21	03:06
Golam	Ishtiak	Bangladesh	Kushtia Government College	15/02/21	08:51
James	Walkling	United Kingdom	University of Cambridge	15/02/21	10:40
Masuk Ridwan	Saumo	Bangladesh	Bangladesh University of Engineering and Technology	15/02/21	11:39
Phung	Minh Hiep	Viet Nam	THPT chuyên Vĩnh Phúc	15/02/21	12:38
Jie	Wang	China	Zhangjiakou No.1 Middle School	16/02/21	13:42
Vineet	Guleria	India	Sri Chaitanya	16/02/21	18:11
Alessandro	Menegon	Brazil	Colégio Objetivo Integrado	16/02/21	18:34
Alexandar	Roussev	Bulgaria	First Language School	17/02/21	10:32
Ameya Vikrama	Singh	India	FIITJEE Junior College	19/02/21	13:25
朝闻道	Jiuyun Cheung	China	Huaiyin Middle School	19/02/21	16:11
Lan	Tianyi	China	Beijing Academy	20/02/21	01:45
星宇姜	Xingyu Jiang	China	Tongji University	20/02/21	03:45
Ashmit	Dutta	United States	Wayzata High School	20/02/21	20:30
Evan	Kim	United States	Tesla STEM High School	21/02/21	09:11

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.