PC2023 Problem 4 – pre-final results

There will be no more hints. The final deadline for the Problem No 4 is extended until 2nd May 23:59 GMT. You will receive a fast feedback regarding your solution.

By 7th May 2023, 13:00 GMT, there are 1301 participants from 91 countries. 68 solutions to P4 were submitted, out of which 32 were correct. Next update of the intermediate results will be together with the final results and the best solutions.
Correct solutions by university students:

LukasSchichtGermanyUniversity of Rostock26/2/23 21:49
TejasAcharyaIndiaUniversity of Oxford2/3/23 12:07
GilRonenIsraelHebrew University of Jerusalem4/3/23 21:20
AnindyaGuriaIndiaIndian Institute of Science6/3/23 07:24
LukaPassek-KumeričkiCroatiaUniversity of Zagreb6/3/23 23:29
AlessioBiccariItalyLa Sapienza8/3/23 21:33
KerimCherkezovTurkmenistanTurkmen State University14/3/23 07:47
EyalWalachIsraelBar-Ilan University29/3/23 12:22
SoumyadeepSarmaIndiaIndian Institute of Science9/4/23 13:53
MarinusLehmannGermanyUniversity of Potsdam12/4/23 11:45
BowenTanChinaJilin Normal University21/4/23 02:56
KonstantinTripunovskiNorth MacedoniaUniversity of Ljubljana – Medical Faculty24/4/23 13:45

Correct solutions by pre-university students:

Vlad-ȘtefanOrosRomania“Grigore Moisil” Theoretical High School26/2/23 14:26
AlptürkEskiTurkeyErbakır Science High School26/2/23 20:23
Emir AkdagKaan DereTurkeyBahcesehir High School for Science and Technology27/2/23 15:02
EppuLeinonenFinlandMunkkiniemen yhteiskoulu2/3/23 15:48
TomasBabelisLithuaniaVilniaus jėzuitų gimnazija3/3/23 21:20
ArdaÜnverTurkeyKocaeli Bahcesehir High School of Science and Technology5/3/23 00:57
Ahmet BahadırTrabzonTurkeyKabataş Erkek High School5/3/23 14:59
BaiyuZhuUnited StatesCalifornia High School6/3/23 04:37
Ilan, Ivan (Team)Mihelja, HegedićCroatiaXV. gymnasium Zagreb, V. gymnasium Zagreb14/3/23 16:51
YuchiZhangChinaUnited World College Changshu China29/3/23 14:26
FilipBaciakPoland1 LO w Chrzanowie29/3/23 19:48
DženanMidžićBosnia and HerzegovinaJU Gimnazija “Bihać”3/4/23 20:20
RhythmKediaIndiaMB International7/4/23 07:42
GuangyuanChenSingaporeRaffles Institution10/4/23 05:40
Elias KoschierMichail OgnyanovAustriaERG Donaustadt14/4/23 18:48
Chung WangLamHong KongSt. Paul’s Co-educational College15/4/23 11:46
JagravGargIndiaFIITJEE21/4/23 07:15
MateuszKamińskiPolandVI High School in Cracow23/4/23 01:08
ZilangShuChinaBeijing National Day School23/4/23 11:15
MichałKołodziejczykPolandI High School in Zielona góra1/5/23 17:36

The list of countries:
Algeria, Argentina, Armenia, Australia, Austria, Azerbaijan, Bahrain, Bangladesh, Belarus, Belgium, Bosnia and Herzegovina, Brazil, Bulgaria, Cambodia, Cameroon, Canada, China, Croatia, Cuba, Czech Republic, Ecuador, Egypt, El Salvador, Estonia, Finland, France, Georgia, Germany, Greece, Guatemala, Honduras, Hong Kong, Hungary, India, Indonesia, Iran, Israel, Italy, Japan, Kazakhstan, Kenya, Kosovo, Kyrgyzstan, Latvia, Lithuania, Macau, Malaysia, Mexico, Moldova, Montenegro, Nepal, Netherlands, Nigeria, North Macedonia, Pakistan, Peru, Philippines, Poland, Romania, Russia, Rwanda, Saudi Arabia, Serbia, Singapore, Slovakia, Slovenia, South Africa, South Korea, Spain, Sri Lanka, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Thailand, Turkey, Turkmenistan, Ukraine, United Arab Emirates, United Kingdom, United States, Uzbekistan, Vietnam