Problem Authors

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