Problem Authors

Problem author Problems Average Difficulty
Zvonimir Medić 1 6.1
Ziyi Tang 2 3.6
Zachary Friggstad 18 4.5
Yujie An 1 6.8
Yuen Chak Fai 2 4.6
Ylvis 1 2.1
Yingtao Tian 3 5.2
Xiayuan Suo 1 1.6
Xiaoyuan Suo 2 4.1
Xiaomin Chen 5 4.9
Wing-Kin Sung 1 6.9
William Gan Wei Liang 2 7.0
William Fiset 2 5.0
Wenli Looi 5 3.4
Walter Guttmann 1 5.9
Volodymyr Lyubinets 5 5.6
Vlado Keselj 1 5.7
Vladimir Valyukh 1 8.6
Victor Loh Bo Huai 1 7.2
Vegard Sjonfjell 2 5.1
Vaibhav Tulsyan 1 3.7
Unnar Freyr Erlendsson 1 1.9
University of Dallas 1 5.5
Ulle Endriss 1 5.1
Ulf Lundström 21 4.6
Tung Kam Chuen 10 6.0
Truls Amundsen Bjørklund 1 1.2
Truls A. Björklund 1 2.6
Troy Vasiga 3 4.2
Torstein Strømme 7 4.0
Torbjørn Morland 21 4.7
Tony Cai 9 4.8
Tonko Sabolčec 1 3.8
Tom Verhoeff 1 3.2
Tom Rokicki 1 3.6
Tommy Färnqvist 3 4.3
Tom Fuller 1 3.7
Tómas Ken Magnússon 3 4.1
Tobias Werth 6 3.9
Timon Knigge 11 5.0
Thomasz Idziaszek 1 3.6
Thomas Lidbetter 2 7.2
Thomas Beuman 4 7.0
Thijs van Ommen 1 7.5
Syx Pek 7 4.9
Swen Gaudl 1 4.9
Svetoslav Tzvetkov 1 8.2
Suhendry Effendy 1 1.3
Stuart Hansen 1 3.9
Stjepan Požgaj 1 5.1
Steven Zeil 11 6.3
Steven Halim 10 3.5
Stein Norheim 7 5.9
Stefan Toman 1 4.9
Stefan Pszczolkowski 1 1.7
Stefan Kraus 1 3.0
Stefan Büttcher 3 5.1
Spencer Pao 1 1.6
Sonny Chan 2 4.8
Simon Lindholm 4 7.2
Simon Klein 1 6.1
Silviu Maniu 2 3.0
Sidney Cadot 1 4.3
Shiplu Hawlader 1 4.1
Shahriar Manzoor 1 4.7
Shaheed Ebrahim 1 2.7
Shafaet Ashraf 1 9.3
Serikzhan S. Kazi 1 5.0
Serikzhan Kazi 1 4.6
Sérgio Crisóstomo 2 3.9
Sean McCulloch 2 7.5
Sander Alewijnse 1 8.6
Samuel Tardieu 1 7.9
Ryan Marshall 5 3.8
Ryan Henning 2 5.9
Rujia Liu 5 5.0
Rudy van Vliet 1 5.6
Roger Henriksson 1 4.6
Robin Lee 18 5.5
Robert Pilgrim 1 2.9
Robert McGorman 1 2.3
Robert Hochberg 9 5.1
R. Marshall 2 2.8
Richard Peng 5 5.2
Raymond van Bommel 7 5.3
Raymond Kang Seng Ing 1 5.6
Raphaël Marinier 2 5.8
Ranald Lam Yun Shao 1 5.1
Ragnar Nevries 1 8.1
Ragnar Groot Koerkamp 10 5.3
Prabhakar Ragde 2 5.7
Piotr Zielinski 1 7.1
Piotr Rudnicki 17 4.2
Piotr Micek 1 6.7
Philip Wellnitz 1 6.0
Petter Elvevoll 2 4.0
Petr Mitrichev 1 6.9
Peter Steele 3 7.3
Peter Košinár 1 7.9
Peter Kluit 1 6.3
Peter Høyer 1 4.8
Per Austrin 100 5.5
Peilin Zhong 1 5.3
Pehr Söderman 13 4.9
Pedro Vasconcelos 4 4.8
Pedro Ribeiro 1 5.0
Pedro Guerreiro 3 4.9
Paweł Komosa 1 7.4
Paweł Idziak 1 2.7
Pawel Gawrychowski 2 7.2
Pavel Petrovic 1 6.4
Paul Wild 3 4.5
Pär Söderhjelm 1 6.5
Pål Grønås Drange 5 4.7
Pål G. Drange 4 6.6
Paco Álvaro 1 7.1
Øyvind Haarberg 4 4.4
Øyvind Grotmol 8 6.4
Owen Kaser 1 5.0
Oskar Werkelin Ahlin 19 4.5
Ondřej Lhoták 32 5.2
Olivier Bourgeois 1 2.2
Olav Røthe Bakken 3 4.2
Nils Grimsmo 4 4.0
Nikola Pintarić 1 1.3
Nikola Dmitrović 5 1.5
Nicholas Sharp 3 2.2
Nguyen Tan Sy Nguyen 1 4.6
Neha Kapur 1 1.5
Nathan Backman 4 4.0
Nalin Bhardwaj 1 7.1
Mykola Protsenko 1 3.7
Moritz Kobitzsch 3 5.6
Modan Han 6 4.1
Mislav Bradač 3 6.0
Mislav Balunović 14 5.5
Mike Zmuda 1 3.8
Mike Domaratzki 2 5.9
Mikael Goldmann 16 5.6
Miguel Oliveira 6 6.0
Miguel Araújo 6 5.6
Michał Sapalski 1 6.4
Michał Pilipczuk 5 4.6
Michal Forišek 6 3.4
Michael Zmuda 1 1.5
Michael Goldwasser 7 5.0
Michael C Slattery 1 6.1
Michael Bradet-Legris 1 4.9
Micah Stairs 2 6.0
Mees de Vries 17 5.1
Max Wilson 1 2.3
Matthias Bayerlein 1 4.6
Matija Milišić 1 5.4
Matias Holte 1 3.8
Mathijs de Weerdt 1 4.3
Martin Macko 1 3.0
Martin Kačer 1 6.9
Mårten Wiman 4 6.6
Markus S. Dregi 4 6.6
Markus Fanebust Dregi 1 4.8
Markus Dregi 2 7.2
Mark Theng Kwang Hui 2 7.8
Marko Ivanković 9 3.4
Marko Berezovsky 4 5.9
Mark Gordon 1 6.7
Marius Andrei 1 6.2
Mario Nakazawa 1 2.1
Marin Tomić 9 5.3
Margarida Mamede 4 4.5
Marc Vinyals 15 6.2
Marcus Isaksson 1 5.5
Marc Furon 1 6.7
Manuel Freire 1 2.7
Manuel Abellanas 1 8.5
Måns Magnusson 3 5.4
Malcolm Sharpe 10 5.9
Mahbubul Hasan 2 5.5
Magnus Øian 2 5.2
Magne Vikjord 3 5.9
Maciej Liskiewicz 1 6.6
Łukasz Matylla 1 9.1
Lukáš Poláček 49 5.6
Luka Kalinovčić 4 5.3
Luis Hernández Corbato 1 8.0
Lucas Wood 1 5.3
Louis Jachiet 1 8.5
Li Cheuk Ting 2 6.3
Liam Keliher 6 5.1
Lewin Gan 2 6.4
Leung Kai Man 1 7.8
Leszek Horwath 1 7.1
Leo Osvald 1 4.8
Lee Chun Yin 1 8.7
Lech Duraj 10 6.5
Law Wai Hon 2 3.6
Lau Lap Chi 1 6.3
Larry Pyeatt 2 4.1
Larry D. Pyeatt 2 6.8
Lap Chi Lau 1 6.8
Kyle See 2 4.9
Kristof Unterweger 1 4.6
Kristoffer Arnsfelt Hansen 1 6.5
Kent Williams-King 4 6.9
Kathleen Ericson 5 3.0
Karl Johan Sande Heimark 9 5.5
Kai Chen 2 4.2
Justin Park 1 2.6
Junbin Teng 1 7.7
Julian Neeleman 1 6.7
Julian Dörfler 1 6.0
Julian Baldus 1 6.0
Jozef Šiška 1 3.4
Josse van Dobben de Bruyn 7 4.6
Joshua T. Guerin 5 3.0
Joshua Moerman 3 5.2
Joseph Swernofsky 1 8.9
José Paulo Leal 1 4.8
Josef Cibulka 1 6.9
Josee Tasse 1 5.0
Joris van Rantwijk 5 5.6
Joran van Apeldoorn 1 4.5
Jon Marius Venstad 10 4.6
Jon Ander Gómez 3 5.4
John Dethridge 4 5.5
John Cigas 4 1.7
John Bonomo 42 4.4
Johan Sannemo 62 5.7
Jimmy Mårdell 17 5.3
Jim Grimmett 10 4.6
Jeroen de Jong 1 6.8
Jeroen Bransen 7 3.8
Jennifer Shimada 1 4.1
Jeff Kinne 1 1.6
Jean Niklas L'orange 4 4.8
Jean-Christophe Filliâtre 1 4.3
Javier Gómez Serrano 3 5.9
Jason Pham 1 3.7
Jan Stoklasa 1 6.9
Jan Kuipers 7 5.9
Jan Elffers 4 5.9
James Stanley 1 2.6
James Feher 5 2.0
Jalal Almhana 1 2.3
Jakub Závodný 1 7.6
Jakub Pachocki 2 7.6
Jakob Krainz 3 6.1
Jacques-Henri Jourdan 1 5.7
Jacob Plachta 3 5.2
Jacob Merizia 1 5.3
Jack Rosenthal 3 1.9
Jaap Eldering 5 6.2
Ivor Page 3 4.2
Ivona Bezakova 4 5.6
Ivan Paljak 7 5.2
Ivan Katanić 5 6.5
Irvan Jahja 8 5.5
Ioana Ilena 1 5.7
Igor Naverniouk 1 6.5
Ian Munro 1 2.7
Hung Chun Ho 1 8.3
Hubert Teo Hua Kian 3 6.5
Howard Cheng 23 4.0
Hon Man Hin 3 5.8
Henry Wang 1 3.9
Henrik Eriksson 4 3.1
Hélène Verhaeghe 1 2.6
Harry Smit 6 4.7
Harrison Fang 2 3.5
Haochen Chen 4 5.8
Hans Wennborg 1 4.1
Gustav Matula 1 5.1
Gunnar Kreitz 10 4.6
Gu Jin 2 6.0
Grzegorz Herman 3 7.4
Gregor Behnke 6 4.5
Greg Hamerly 92 4.1
Graeme Kemkes 1 2.7
Gordon V. Cormack 44 5.0
Gordon Cormack 1 6.4
Goran Žužić 8 6.5
Goran Gašić 2 5.9
Godmar Back 27 3.6
Gilbert Lee 1 6.4
Gerben Stavenga 3 5.8
Fredrik Svensson 4 6.5
Fredrik Niemelä 2 5.4
Frane Kurtović 1 4.8
François Aubry 2 4.2
Francisco Criado 1 5.0
Florin Ghesu 1 6.4
Filip Barl 7 3.7
Felix Halim 1 2.2
Etienne Vouga 3 4.4
Erik Aas 3 7.4
Eric Shade 1 5.3
Eric Hervet 1 2.3
Enrique Martín Martín 1 8.3
Emma Enström 3 3.3
Emilio Vivancos 1 5.0
Eirik Reksten 1 8.0
Egor Dranischnikow 3 4.1
Eduard Kalinicenko 1 6.9
Ed Skochinski 1 8.2
Don Reble 3 4.6
Dominik Gleich 17 5.4
Domagoj Ćevid 2 6.7
Domagoj Bradač 1 7.2
Derek Kisman 3 6.9
Deon Nicholas 5 4.8
David van Brackle 1 6.6
David Sturgill 74 3.9
David Poplawski 1 5.9
David García Soriano 2 6.6
David Arthur 1 6.3
Dave Hotchkiss 2 1.8
Darko Aleksic 7 4.0
Darcy Best 5 5.0
Daniel Stefankovic 3 7.3
Daniel Robbins 1 5.9
Daniel Paleka 1 8.5
Daniel Moyer 1 2.2
Daniel Lokshtanov 4 5.1
Daniel Gil 1 1.6
Daniel Espling 3 6.6
Daniel Brinkers 2 2.4
Damian Straszak 2 6.3
Cosmin Negruseri 4 5.8
Christopher Raphael 1 6.0
Christoph Dürr 2 4.8
Christian Renner 2 4.8
Christian Neverdal Jonassen 2 2.2
Christian Ledig 1 4.8
Christian Jonassen 1 1.5
Christian Hundt 1 8.1
Chin Zhan Xiong 1 5.8
Chidambaram Annamalai 1 7.6
Chengyu Lin 2 8.3
Charles L. A. Clarke 1 3.5
Chan Pak Hei 1 4.6
Chan Pak Hay 1 4.4
Chad Mourning 1 3.0
Bryce Sandlund 3 5.1
Bruno Rahle 6 3.6
Bruce S. Elenbogen 1 2.8
Bruce Elenbogen 1 5.7
Brian Chen 1 3.4
Branimir Filipović 3 3.2
Brandon Fuller 9 5.1
Bo Zhou 1 9.2
Bowen Yu 24 6.1
Børge Nordli 1 5.0
Bob Roos 3 5.7
Bob Pilgrim 2 4.1
Boaz Pat-El 4 5.1
Boas Kluiving 1 6.5
Björn Hegerfors 1 7.7
Bjarki Ágúst Guðmundsson 13 4.7
Birk Tjelmeland 2 4.7
Ben Zhang 1 6.9
Ben Bradshaw 1 6.0
Bartosz Walczak 2 6.0
Bartholomew Furrow 3 5.5
Babak Behsaz 6 4.2
Arup Guha 3 5.5
Arthur van Goethem 2 3.5
Arne Alex 3 5.2
Arnav Sastry 5 3.7
Arkadiusz Pawlik 4 7.8
Ariana Herbst 1 5.4
Antti Laaksonen 5 5.6
Antonio Jurić 6 4.8
Anton Grbin 2 6.7
Ante Derek 1 6.5
Andy Nguyen 2 8.2
Andy Harrington 2 7.2
Andriy Katkov 2 5.1
Andrew Warner 1 5.7
Andrew Stankevich 1 8.0
Andrew Harrington 7 4.0
Andrew Gove 1 4.6
André Susano Pinto 2 6.2
Andreas Schuh 1 1.6
Andreas Lundblad 3 7.0
Andreas Björklund 20 5.6
Ana Paula Tomás 3 5.1
Amar Topalovic 2 5.5
Alex ten Brink 1 6.4
Alex Li 4 6.0
Alex Brodsky 1 6.1
Alexander Wei 1 6.0
Alexander Scheel 2 3.2
Alexander Rass 4 5.5
Alexander Dietsch 2 2.5
Akshay Goel 1 4.5
Adrian Satja Kurdija 15 4.9
Adrian Kügel 3 4.4
Adam Polak 6 5.5
Abe Wits 4 5.3
Abel Molina 1 4.8
A.Augusto de Sousa 1 6.0
Aarav Singh 1 1.3