Problem Authors

Problem author   Problems Average Difficulty
Zvonimir Medić 1 6.7hard
Ziyi Tang 2 3.6medium
Zhang Guangxuan 3 7.1hard
Zack Butler 7 4.6medium
Zachary Geier 1 6.6hard
Zachary Friggstad 45 4.7medium
Yujie An 2 7.8hard
Yuen Chak Fai 2 5.2medium
Ylvis 1 2.2easy
Yingtao Tian 3 5.8hard
Yen Truong 1 8.3hard
Xiayuan Suo 1 1.6easy
Xiaoyuan Suo 2 3.5medium
Xiaomin Chen 5 5.2medium
Wing-Kin Sung 1 6.8hard
William Gan Wei Liang 2 7.3hard
William Fiset 4 4.1medium
Wenli Looi 9 4.5medium
Wenda Qiu 3 5.4medium
Walter Kong 1 7.7hard
Walter Guttmann 1 6.6hard
Vytautas Gruslys 1 5.5medium
Vuong Hoang Long 2 5.7hard
Volodymyr Lyubinets 6 5.8hard
Vlado Keselj 1 7.5hard
Vladimir Valyukh 3 7.2hard
Vinh Pham 1 4.4medium
Victor Song 1 4.1medium
Victor Loh Bo Huai 1 7.4hard
Vegard Sjonfjell 2 3.9medium
Vamsi Manne 1 2.2easy
Vaibhav Tulsyan 1 4.6medium
Unnar Freyr Erlendsson 2 2.3easy
University of Dallas 1 5.1medium
Ulle Endriss 1 5.1medium
Ulf Lundström 23 4.7medium
Tung Kam Chuen 10 6.5hard
Truls Amundsen Bjørklund 1 1.3easy
Truls A. Björklund 1 2.4easy
Troy Vasiga 3 3.9medium
Troels Bjerre Lund 1 7.6hard
Travis Meade 1 8.1hard
Torstein Strømme 16 4.7medium
Torbjørn Morland 21 4.8medium
Tony Xia 2 2.8easy
Tony Cai 12 4.4medium
Tonko Sabolčec 1 3.4medium
Tom Verhoeff 1 2.6easy
Tom Rokicki 1 3.0medium
Tommy Färnqvist 3 4.2medium
Tom Fuller 1 2.1easy
Tomas Rokicki 3 5.6hard
Tómas Ken Magnússon 4 4.7medium
Tobias Werth 6 4.3medium
Tobias Lenz 1 5.5hard
Timon Knigge 19 5.1medium
Thore Husfeldt 16 4.8medium
Thomasz Idziaszek 1 4.9medium
Thomas Lidbetter 7 6.9hard
Thomas Beuman 4 7.4hard
Thijs van Ommen 1 7.5hard
Thierry Lavoie 3 5.5hard
Tan Jun An 2 3.1medium
Tähvend Uustalu 1 6.3hard
Syx Pek 7 5.8hard
Synopsys 3 5.5hard
Swen Gaudl 1 6.8hard
Svetoslav Tzvetkov 1 8.0hard
Suhendry Effendy 1 1.5easy
Stuart Hansen 1 3.8medium
Stjepan Požgaj 1 5.3medium
Stjepan Glavina 2 5.4medium
Steven Zeil 11 5.4medium
Steven Wijaya 2 7.2hard
Steven Halim 24 5.0medium
Stein Norheim 7 6.1hard
Stefan Toman 1 2.7easy
Stefan Pszczolkowski 1 1.7easy
Stefan Kraus 1 3.5medium
Stefan Büttcher 3 5.0medium
Spencer Pao 1 2.1easy
Sonny Chan 6 4.6medium
Sondre Sortland 2 6.8hard
Simon Lindholm 22 7.2hard
Simon Klein 1 5.7hard
Silviu Maniu 2 3.2medium
Sigurður Jens Albertsson 1 1.4easy
Sidney Cadot 1 3.3medium
Sidhant Bansal 2 3.4medium
Shiplu Hawlader 1 4.8medium
Shantanu Modak 3 3.9medium
Shahriar Manzoor 1 6.5hard
Shaheed Ebrahim 1 3.0medium
Shafaet Ashraf 1 9.3hard
Serikzhan S. Kazi 1 3.2medium
Serikzhan Kazi 1 5.8hard
Sérgio Crisóstomo 2 3.0medium
Sean McCulloch 3 7.4hard
Scott McGowan 1 3.9medium
Sander Land 1 7.1hard
Sander Alewijnse 1 9.4hard
Samuel Tardieu 1 6.7hard
Samuel Furman 3 3.5medium
Saketh Are 1 5.6hard
Saarthak Sharma 1 7.6hard
Ryan Marshall 5 3.5medium
Ryan Henning 2 5.5hard
Ryan Farrell 2 4.3medium
Rujia Liu 5 4.7medium
Rudy van Vliet 1 5.8hard
Rongqi Qiu 2 7.3hard
Rohit Nema 2 4.3medium
Roger Henriksson 1 4.3medium
Robin Lee 20 5.5medium
Robin Christopher Yu 49 7.1hard
Robert Pilgrim 1 2.4easy
Robert McGorman 1 2.0easy
Robert Hochberg 10 4.9medium
R. Marshall 2 2.8easy
Rishi Sankar 3 6.5hard
Richard Peng 5 5.2medium
Reiya Downs 1 2.3easy
Reinier Schmiermann 3 5.1medium
Raymond van Bommel 10 4.9medium
Raymond Kang Seng Ing 1 6.6hard
Rasmus Pagh 1 6.7hard
Raphaël Marinier 2 6.3hard
Ranald Lam Yun Shao 2 7.4hard
Ragnar Nevries 1 8.0hard
Ragnar Groot Koerkamp 19 5.3medium
Rachel Krohn 1 7.4hard
Programmeringsolympiaden 2 4.6medium
Prabhakar Ragde 2 4.9medium
Piotr Zielinski 1 6.9hard
Piotr Rudnicki 20 4.3medium
Piotr Micek 1 7.4hard
Philip Wellnitz 1 5.8hard
Petter Elvevoll 2 4.2medium
Petr Mitrichev 1 6.4hard
Peter Steele 3 7.5hard
Peter Košinár 1 4.7medium
Peter Kluit 1 8.8hard
Peter Høyer 1 4.7medium
Per Austrin 114 5.6hard
Peilin Zhong 2 7.4hard
Pehr Söderman 18 4.4medium
Pedro Vasconcelos 4 5.0medium
Pedro Ribeiro 1 6.6hard
Pedro Guerreiro 3 5.2medium
Paweł Komosa 1 8.8hard
Paweł Idziak 1 2.3easy
Pawel Gawrychowski 2 7.8hard
Pavel Petrovic 1 5.1medium
Paul Wild 9 5.3medium
Pär Söderhjelm 1 6.0hard
Pål Grønås Drange 8 4.1medium
Pål G. Drange 4 6.5hard
Paco Álvaro 1 8.2hard
Øyvind Haarberg 4 4.7medium
Øyvind Grotmol 8 6.8hard
Owen Kaser 2 5.2medium
Oskar Werkelin Ahlin 20 4.5medium
Oskar Haarklou Veileborg 3 4.4medium
Onno Berrevoets 3 3.0medium
Ondřej Lhoták 43 5.1medium
Ómar Högni Guðmarsson 1 1.5easy
Olivier Bourgeois 1 2.0easy
Olav Røthe Bakken 7 5.0medium
Óðinn Eyjólfsson 1 5.9hard
Noah Weninger 12 5.2medium
Nils Gustafsson 40 5.7hard
Nils Grimsmo 5 4.4medium
Nils Barlaug 2 6.8hard
Nikola Pintarić 1 1.3easy
Nikola Dmitrović 5 1.5easy
Nikil Selvam 2 5.9hard
Nicole Hedblom 1 5.4medium
Nicolas Hardy 3 3.5medium
Nick Wu 9 4.3medium
Nicholas Sharp 3 2.1easy
Nguyen Tan Sy Nguyen 1 5.1medium
Nguyen Dinh Quang Minh 9 7.7hard
Neha Kapur 1 1.5easy
Nathan Mytelka 1 6.8hard
Nathan Backman 4 3.9medium
Nalin Bhardwaj 2 6.3hard
Mykola Protsenko 1 3.3medium
Muhammad Ayaz Dzulfikar 1 3.3medium
Moritz Kobitzsch 3 5.1medium
Mohammadreza Mohseni 1 8.1hard
Modan Han 6 4.4medium
Mislav Bradač 3 6.7hard
Mislav Balunović 14 5.6hard
Ming-Yee Iu 1 5.0medium
Mike Zmuda 1 3.3medium
Mike Domaratzki 3 5.8hard
Mikael Goldmann 17 5.4medium
Miguel Oliveira 6 6.5hard
Miguel Araújo 6 5.3medium
Michał Sapalski 1 7.2hard
Michał Pilipczuk 5 4.3medium
Michal Forišek 6 3.0medium
Michael Zündorf 1 7.3hard
Michael Zmuda 1 1.6easy
Michael Goldwasser 7 4.8medium
Michael C Slattery 1 7.2hard
Michael Bradet-Legris 1 2.3easy
Micah Stairs 6 6.4hard
Mees de Vries 27 4.6medium
Max Wilson 1 2.1easy
Mattias Akke 5 5.2medium
Matthias Bayerlein 1 3.9medium
Matthew Ng Zhen Rui 6 3.8medium
Matt Fontaine 2 6.2hard
Matt Davison 3 2.6easy
Mats Petter Wallander 1 8.8hard
Mats Petter Pettersson 1 1.3easy
Matija Milišić 1 7.8hard
Matias Holte 1 2.9medium
Mathijs de Weerdt 1 3.3medium
Martin Tran 6 2.4easy
Mārtiņš Opmanis 1 9.5hard
Mārtinš Opmanis 1 5.6hard
Martin Macko 1 3.4medium
Martin Kačer 1 6.7hard
Mårten Wiman 6 6.2hard
Markus S. Dregi 4 6.5hard
Markus Fanebust Dregi 1 5.0medium
Markus Dregi 4 6.5hard
Mark Theng Kwang Hui 2 7.8hard
Marko Ivanković 10 4.0medium
Marko Berezovsky 7 5.2medium
Mark Gordon 1 7.4hard
Mark Braganza 1 5.2medium
Marius Andrei 1 6.5hard
Mario Nakazawa 1 2.0easy
Marin Tomić 9 5.2medium
Margarida Mamede 4 4.9medium
Marc Vinyals 15 6.2hard
Marcus Isaksson 1 5.7hard
Marc Phua Hsiao Meng 5 6.1hard
Marc Furon 3 6.1hard
Manuel Freire 1 2.9medium
Manuel Abellanas 1 7.9hard
Måns Magnusson 10 4.4medium
Malcolm Sharpe 11 6.3hard
Maj Stenmark 3 2.9medium
Mahbubul Hasan 2 6.8hard
Magnus Øian 2 5.3medium
Magne Vikjord 3 6.0hard
Maciej Liskiewicz 1 6.9hard
Luke Son 1 3.9medium
Łukasz Matylla 1 8.0hard
Lukáš Poláček 50 5.7hard
Luka Kalinovčić 5 5.6hard
Luis Hernández Corbato 1 8.9hard
Lucas Xia 2 5.5medium
Lucas Wood 1 3.8medium
Louis Jachiet 1 8.0hard
Loke Gustafsson 1 6.8hard
Li Cheuk Ting 2 7.0hard
Liam Keliher 23 4.4medium
Lewin Gan 15 6.6hard
Leung Kai Man 1 8.5hard
Leszek Horwath 1 7.4hard
Leo Osvald 2 6.3hard
Lenny Wu 1 4.6medium
Lee Chun Yin 1 8.2hard
Lech Duraj 10 6.2hard
Law Wai Hon 2 3.8medium
Lau Lap Chi 1 6.5hard
Lars Åström 3 3.8medium
Larry Pyeatt 2 3.7medium
Larry D. Pyeatt 2 6.7hard
Lap Chi Lau 1 6.4hard
Lalitha Kuppa 3 3.5medium
Kyle See 2 6.6hard
Kwee Lung Sin 3 8.0hard
Kuan Wei Heng 1 3.2medium
Kristof Unterweger 1 6.5hard
Kristoffer Arnsfelt Hansen 1 6.0hard
Kent Williams-King 4 6.7hard
Katie Chang 1 1.9easy
Kathleen Ericson 9 3.1medium
Karl Lundstig 1 1.6easy
Karl Johan Sande Heimark 9 5.2medium
Kai Chen 3 4.6medium
Justin Park 1 2.7easy
Justin Li 2 7.2hard
Justas Klimavičius 1 4.0medium
Junbin Teng 1 7.3hard
Julian Neeleman 1 7.4hard
Julian Dörfler 1 5.8hard
Julian Baldus 1 5.8hard
Julia Mårtensson 2 4.1medium
Jozef Šiška 1 2.9medium
Josse van Dobben de Bruyn 7 4.2medium
Joshua T. Guerin 9 3.1medium
Joshua Moerman 3 6.1hard
Joseph Swernofsky 3 4.2medium
José Paulo Leal 1 4.0medium
Josef Cibulka 1 6.7hard
Josee Tasse 1 5.2medium
Jorke de Vlas 5 5.4medium
Joris van Rantwijk 5 5.4medium
Joran van Apeldoorn 1 5.0medium
Jon Marius Venstad 10 5.2medium
Jonathan Chong 4 4.2medium
Jon Ander Gómez 3 5.3medium
John Keyser 2 6.6hard
John Dethridge 4 5.8hard
John Cigas 4 1.8easy
John Bonomo 48 4.8medium
Johan Sannemo 144 5.2medium
Jingbo Shang 8 5.8hard
Jimmy Mårdell 20 5.9hard
Jim Grimmett 10 5.0medium
Jiju Poovvancheri 1 3.0medium
Jesper Öqvist 4 5.8hard
Jeroen de Jong 1 6.8hard
Jeroen Bransen 8 3.8medium
Jennifer Shimada 1 6.2hard
Jennifer Lhoták 1 6.8hard
Jeffrey Peng 1 5.2medium
Jeff Kinne 1 1.5easy
Jean Niklas L'orange 22 5.1medium
Jean-Christophe Filliâtre 1 4.4medium
Javier Gómez Serrano 3 5.9hard
Jason Pham 1 4.2medium
Jan Stoklasa 1 6.7hard
Jan Kuipers 8 6.0hard
Jan Elffers 4 5.4medium
James Stanley 1 2.7easy
James R (Bob) Bradley 1 2.0easy
James Hughes 1 6.3hard
James Feher 5 1.9easy
Jalal Almhana 1 2.0easy
Jakub Závodný 1 8.1hard
Jakub Radoszewski 1 5.5medium
Jakub Pachocki 2 7.9hard
Jakob Krainz 3 4.8medium
Jaehyun Park 1 6.1hard
Jacques-Henri Jourdan 1 5.3medium
Jacob Zhang 4 5.9hard
Jacob Plachta 3 4.6medium
Jacob Merizia 1 4.3medium
Jack Rosenthal 3 1.9easy
Jaap Eldering 5 6.1hard
Ivor Page 3 4.3medium
Ivona Bezakova 7 6.3hard
Ivan Paljak 7 5.5hard
Ivan Katanić 6 6.3hard
Isaac Lee 2 6.6hard
Isaac Arvestad 4 4.2medium
Irvan Jahja 8 5.8hard
Irina Kostitsyna 1 4.8medium
Ioana Ilena 1 5.6hard
Igor Naverniouk 1 5.9hard
Ian Munro 1 2.9medium
Hung Chun Ho 1 8.5hard
Hugo Eberhard 1 7.5hard
Hubert Teo Hua Kian 3 6.9hard
Howard Whitston 1 1.7easy
Howard Cheng 36 3.9medium
Hon Man Hin 3 6.2hard
Henry Xia 4 6.4hard
Henry Wang 2 5.0medium
Henrik Eriksson 4 3.3medium
Hélène Verhaeghe 1 2.6easy
Harry Smit 9 5.7hard
Harrison Fang 2 3.4medium
Haochen Chen 4 5.8hard
Hans Wennborg 1 5.7hard
Håkan Strömberg 1 2.5easy
Gustav Matula 1 3.5medium
Gustav Kalander 2 9.0hard
Gunnar Kreitz 11 5.0medium
Gu Jin 3 7.0hard
Grzegorz Herman 3 7.9hard
Gregor Behnke 6 4.9medium
Greg Hamerly 99 3.8medium
Graeme Zinck 2 4.6medium
Graeme Kemkes 1 2.9medium
Gordon V. Cormack 46 4.9medium
Gordon Cormack 1 7.8hard
Goran Žužić 9 6.5hard
Goran Gašić 3 5.2medium
Godmar Back 42 4.0medium
Gilbert Lee 1 5.4medium
Gerben Stavenga 3 6.1hard
Gabriela Velazquez-Pergola 1 4.4medium
Freyr Bergsteinsson 1 8.0hard
Fredrik Svensson 4 6.6hard
Fredrik Niemelä 2 4.7medium
Fredrik Hernqvist 2 4.6medium
Fredrik Ekholm 1 8.1hard
Frane Kurtović 1 5.2medium
François Aubry 2 4.5medium
Francisco Criado 1 4.9medium
Florin Ghesu 1 7.1hard
Finn Lidbetter 1 4.3medium
Filip Barl 7 4.1medium
Filiberto Fuentes 1 7.5hard
Felix Halim 1 2.5easy
Eyleifur Ingþór Bjarkason 1 4.6medium
Evan Quach 1 3.7medium
Etienne Vouga 13 5.8hard
Erling Alf Ellingsen 1 6.4hard
Erik Odenman 1 4.4medium
Erik Amirell Eklöf 5 6.9hard
Erik Aas 3 6.9hard
Eric Shade 1 5.3medium
Eric Hervet 1 2.0easy
Enrique Martín Martín 1 7.9hard
Emma Enström 3 2.6easy
Emilio Vivancos 1 5.3medium
Eirik Reksten 1 7.3hard
Egor Dranischnikow 3 4.4medium
Edvard Kristoffer Neset Karlsen 1 5.7hard
Eduard Kalinicenko 1 7.4hard
Ed Skochinski 4 5.3medium
Edbert Geraldy Cangdinata 1 5.9hard
ECNA Judging Team 13 5.3medium
Don Reble 3 4.9medium
Dominik Gleich 17 5.4medium
Domagoj Ćevid 3 6.3hard
Domagoj Bradač 1 5.1medium
Dillon Cutaiar 1 2.1easy
Derek Kisman 3 7.3hard
Deon Nicholas 5 4.8medium
David Zheng 5 5.1medium
David Venhoek 2 4.5medium
David Van Brackle 5 5.3medium
David van Brackle 1 7.5hard
David Sturgill 74 3.8medium
David Poplawski 1 5.4medium
David García Soriano 2 6.5hard
David Arthur 1 7.9hard
Dave Hotchkiss 2 2.0easy
Darko Aleksic 7 4.1medium
Darcy Best 7 4.0medium
Dante Bencivenga 12 4.7medium
Daniel Stefankovic 5 7.7hard
Daniel Robbins 1 6.6hard
Daniel Paleka 1 8.2hard
Daniel Moyer 1 2.2easy
Daniel Lokshtanov 4 6.6hard
Daniel Gil 1 1.9easy
Daniel Espling 3 5.8hard
Daniel Brinkers 2 2.4easy
Dan Folescu 1 1.8easy
Dan Alden Baterisna 2 7.0hard
Damian Straszak 2 5.0medium
Daan van Gent 2 6.5hard
Cosmin Negruseri 4 6.4hard
Colin Peppler 1 2.6easy
Clark Cucinell 1 2.4easy
Christopher Raphael 1 5.9hard
Christoph Dürr 2 5.1medium
Christian Renner 2 4.5medium
Christian Neverdal Jonassen 2 2.2easy
Christian Ledig 1 4.5medium
Christian Jonassen 1 1.5easy
Christian Hundt 1 8.0hard
Chin Zhan Xiong 1 7.8hard
Chidambaram Annamalai 1 7.9hard
Chengyu Lin 3 6.2hard
Charles L. A. Clarke 1 3.8medium
Chan Pak Hei 1 7.0hard
Chan Pak Hay 1 4.1medium
Chad Mourning 1 2.7easy
Calvin Li 1 2.1easy
Calvin Godfrey 1 6.7hard
Bryce Sandlund 6 5.7hard
Bruno Rahle 7 3.4medium
Bruno Ploumhans 1 5.1medium
Bruce S. Elenbogen 1 2.9medium
Bruce Elenbogen 1 5.4medium
Brook Tamir 1 6.0hard
Brian Chen 1 2.5easy
Brent Yorgey 1 5.7hard
Branimir Filipović 3 3.5medium
Brandon Fuller 15 4.2medium
Bo Zhou 2 9.0hard
Bowen Yu 49 6.2hard
Børge Nordli 2 4.9medium
Bob Roos 20 5.1medium
Bob Pilgrim 2 3.8medium
Bob Logan 3 4.1medium
Boaz Pat-El 4 4.8medium
Boas Kluiving 2 6.7hard
Björn Martinsson 7 6.4hard
Björn Magnusson 1 9.3hard
Björn Hegerfors 1 7.2hard
Bjarki Ágúst Guðmundsson 21 5.0medium
Birk Tjelmeland 2 4.9medium
Bill Liu 2 6.7hard
Bergur Snorrason 16 4.5medium
Ben Zhang 1 7.1hard
Benjamin Reidys 3 3.5medium
Benjamin Reed 1 2.5easy
Ben Bradshaw 1 6.8hard
Bartosz Walczak 2 6.1hard
Bartholomew Furrow 3 6.1hard
BAPC jury 2019 1 5.6hard
Babak Behsaz 6 4.2medium
Atli Fannar Franklín 6 4.1medium
Asger Hautop Drewsen 2 5.6hard
Arup Guha 4 5.2medium
Arthur van Goethem 2 3.7medium
Aron Granberg 1 1.8easy
Arne Alex 3 5.5medium
Arnav Sastry 11 4.5medium
Arnar Bjarni Arnarson 3 3.3medium
Arkadiusz Pawlik 4 7.8hard
Ariana Herbst 2 7.0hard
Arash Rouhani 1 5.1medium
Arash Behpour 1 3.7medium
Antti Laaksonen 11 5.5medium
Antonio Jurić 6 4.7medium
Anton Grbin 2 7.3hard
Anthony Han 4 4.7medium
Ante Derek 1 5.9hard
Andy Nguyen 5 6.4hard
Andy Harrington 2 6.5hard
Andriy Katkov 2 3.5medium
Andrew Warner 1 6.4hard
Andrew Stankevich 1 8.1hard
Andrew Nuxoll 1 4.6medium
Andrew Harrington 7 3.8medium
Andrew Gove 1 4.1medium
Andrew Baas 1 6.7hard
Andrew Ahnn 2 2.8easy
André Susano Pinto 2 7.6hard
Andreas Schuh 1 1.8easy
Andreas Lundblad 3 7.3hard
Andreas Björklund 22 5.7hard
Ana Paula Tomás 3 4.6medium
Amar Topalovic 2 7.4hard
Alvin Nguyen 1 2.0easy
Aloysius Lim Dewen 2 6.3hard
Alex ten Brink 1 5.8hard
Alex Lind 2 3.0medium
Alex Li 4 5.8hard
Alex Brodsky 2 4.8medium
Alexander Wei 1 5.9hard
Alexander Scheel 2 3.3medium
Alexander Rass 4 6.4hard
Alexander Dietsch 5 5.8hard
Akshay Goel 1 3.9medium
Adrian Satja Kurdija 18 4.9medium
Adrian Kügel 3 4.7medium
Adam Polak 6 5.6hard
Abod Abbas 2 2.1easy
Abe Wits 5 5.5hard
Abel Molina 1 4.2medium
Abdullah Zaghmout 1 7.4hard
A.Augusto de Sousa 1 6.1hard
Aaron Lengyel 5 2.9medium
Aaron Deever 2 6.2hard
Aarav Singh 2 4.4medium