Problem A
Image Decoding — Problem Statistics

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Submissions	7368
Accepted submissions	1411
Submission ratio	19.15%
Authors	1262
Full solves [?]	1029
Full solve Ratio	81.54%

#	User	Runtime	Language	Date
1	Mikael Magnusson	0.00 s	C	2017-01-16 17:36:44
2	Bernd Schmidt	0.00 s	C	2017-06-03 01:48:11
3	Seth Carter	0.00 s	C	2017-11-16 17:55:15
4	Ioannis Br	0.00 s	C	2020-06-26 01:30:04
5	Sambit Palit	0.00 s	C	2020-11-18 05:01:04
6	Luca Dolci	0.01 s	C	2019-03-14 22:04:19
7	Ferenc Rékasi	0.01 s	C	2021-12-13 20:30:13
8	Ledion Daja	0.01 s	C	2023-02-20 15:28:24
9	Hidden user	0.01 s	C	2024-08-31 23:48:48
10	Avanish Mallya	0.01 s	C	2026-01-21 00:02:17

#	User	Runtime	Language	Date
1	Peti29	0.03 s	C#	2017-06-02 23:16:15
2	Ryan Randhawa	0.03 s	C#	2017-11-15 22:47:42
3	Apurv Parekh	0.03 s	C#	2019-02-22 19:16:49
4	Leo Rosen	0.04 s	C#	2021-10-25 20:04:54
5	Andreas Nilsson	0.04 s	C#	2022-05-03 21:42:09
6	Linus Yng	0.05 s	C#	2017-05-31 11:21:25
7	Aron Rask	0.05 s	C#	2021-09-23 18:25:57
8	Stian Talgø	0.05 s	C#	2023-03-03 21:14:00
9	Tom Karlsson	0.05 s	C#	2023-04-15 15:07:08
10	David Kuun	0.05 s	C#	2023-10-15 20:31:59

#	User	Runtime	Language	Date
1	Grae Yeandle	0.00 s	C++	2017-02-25 21:15:16
2	Elias Lousseief	0.00 s	C++	2017-11-04 19:31:47
3	Auburn Ford	0.00 s	C++	2019-03-26 05:23:37
4	Agis Daniels	0.00 s	C++	2020-04-02 19:51:42
5	Scott MacIntosh	0.00 s	C++	2020-05-23 19:38:06
6	Hidden user	0.00 s	C++	2022-03-04 10:59:34
7	Nikola Katov	0.00 s	C++	2025-05-03 02:36:41
8	go_mu	0.00 s	C++	2025-11-13 12:16:28
9	Tomas Lagland	0.01 s	C++	2015-08-26 14:30:23
10	Collin Rapp	0.01 s	C++	2015-09-22 04:20:35

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	Common Lisp	2019-07-17 21:23:42

#	User	Runtime	Language	Date
1	Marcus Asplund	0.03 s	Go	2025-05-08 11:05:49
2	Norbert Voelker	0.08 s	Go	2021-11-13 21:59:10
3	Nicholas Miettinen	0.65 s	Go	2023-06-11 13:17:41

#	User	Runtime	Language	Date
1	Isaac Arvestad	0.01 s	Haskell	2019-03-09 11:32:11
2	Tim Put	0.01 s	Haskell	2021-06-02 23:17:10
3	Steinar Simonnes	0.02 s	Haskell	2025-09-12 21:27:58
4	Brent Yorgey	0.04 s	Haskell	2018-05-03 04:51:16
5	Ryan Yates	0.07 s	Haskell	2019-05-24 17:19:13
6	Antony Lee	0.08 s	Haskell	2020-05-13 18:17:18
7	Jan Hlavacek	0.09 s	Haskell	2016-11-23 04:12:29
8	Mikail Khan	0.09 s	Haskell	2022-01-14 19:48:38
9	Øyvind Almli	0.10 s	Haskell	2021-11-14 02:11:41

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.08 s	Java	2022-05-11 08:52:09
2	Leon Wang	0.11 s	Java	2024-09-01 01:53:49
3	Paul Boddington	0.14 s	Java	2016-05-14 23:29:58
4	Samuel Klingström	0.14 s	Java	2017-07-24 14:07:43
5	Gísli Freyr Sæmundsson	0.14 s	Java	2017-10-30 17:55:49
6	Micah Stairs	0.15 s	Java	2016-09-10 00:46:23
7	Martijn Muijsers	0.15 s	Java	2016-10-29 01:37:24
8	Haytem Haider	0.15 s	Java	2021-04-27 12:24:51
9	Kabir Batra	0.15 s	Java	2022-01-18 07:21:16
10	Elaine Huang	0.15 s	Java	2024-08-27 17:22:02

#	User	Runtime	Language	Date
1	Abirami Pmr	0.07 s	JavaScript (Node.js)	2024-02-04 16:55:48
2	Diogo Guedes	0.07 s	JavaScript (Node.js)	2024-07-01 12:12:15
3	Jakob Bergendahl	0.07 s	JavaScript (Node.js)	2026-01-16 17:41:52
4	Sander Hellesø	0.08 s	JavaScript (Node.js)	2019-04-26 04:35:37
5	Olga Prikhodko	0.08 s	JavaScript (Node.js)	2023-12-07 21:03:13
6	Daniel Rocha	0.08 s	JavaScript (Node.js)	2024-07-13 00:02:05
7	Fidel Ernesto Alonso Ochoa	0.08 s	JavaScript (Node.js)	2026-02-21 16:15:49
8	Juliana Silva	0.08 s	JavaScript (Node.js)	2026-02-24 03:15:32
9	João Portugal	0.09 s	JavaScript (Node.js)	2024-08-14 19:55:18
10	Xavier Calhau	0.10 s	JavaScript (Node.js)	2025-10-10 09:55:02

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2016-02-29 16:41:09
2	Peter Kedemo	0.05 s	JavaScript (SpiderMonkey)	2016-01-01 19:38:34
3	Christian Pilegaard Cederquist	0.06 s	JavaScript (SpiderMonkey)	2023-07-23 12:11:41
4	Zachary DeStefano	0.09 s	JavaScript (SpiderMonkey)	2019-09-28 23:01:24
5	J M	0.11 s	JavaScript (SpiderMonkey)	2016-10-28 14:40:54

#	User	Runtime	Language	Date
1	Hidden user	0.74 s	Julia	2025-09-08 20:30:59
2	Timothy Gaede	0.79 s	Julia	2024-06-06 05:33:15

#	User	Runtime	Language	Date
1	Hidden user	0.34 s	Kotlin	2017-12-11 08:43:42
2	Nuno Silva	0.55 s	Kotlin	2025-10-01 17:52:03

#	User	Runtime	Language	Date
1	Autumn Evelyn Dzian	0.02 s	OCaml	2021-04-17 22:03:15

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.03 s	Pascal	2019-10-08 19:40:46

#	User	Runtime	Language	Date
1	João Vasconcelos	0.02 s	PHP	2024-11-21 17:33:05
2	Pedro Gaspar	0.02 s	PHP	2025-09-28 21:33:03
3	Emerson Nunes	0.02 s	PHP	2025-12-18 17:13:31
4	Anthony Galea	0.05 s	PHP	2021-01-16 22:15:06

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.24 s	Prolog	2018-11-24 14:02:47

#	User	Runtime	Language	Date
1	Urban Pettersson	0.04 s	Python 2	2015-11-02 17:22:17
2	Rhys Balevicius	0.04 s	Python 2	2017-10-31 20:50:24
3	Hermon Mulat	0.04 s	Python 2	2018-12-19 17:34:42
4	Christofer Ohlsson	0.05 s	Python 2	2015-08-18 23:23:03
5	Erik Sillén	0.05 s	Python 2	2016-07-17 12:29:03
6	Michael Laszlo	0.05 s	Python 2	2016-10-22 03:07:36
7	Mathis Hammel	0.05 s	Python 2	2016-11-24 16:58:56
8	Trevor Masters	0.05 s	Python 2	2017-10-30 20:22:29
9	Ocram Esah	0.05 s	Python 2	2022-04-14 22:16:37
10	Neal Zane	0.06 s	Python 2	2016-08-08 03:15:32

#	User	Runtime	Language	Date
1	Hyaline Seiche	0.03 s	Python 3	2017-06-02 20:53:45
2	Ram Basnet	0.04 s	Python 3	2017-03-02 04:48:06
3	Richard Sterling	0.04 s	Python 3	2017-03-03 20:09:04
4	Nicholas Lantz	0.04 s	Python 3	2017-06-27 04:13:19
5	Melody Horn	0.04 s	Python 3	2017-09-06 00:38:43
6	Tim Salmon	0.04 s	Python 3	2017-09-19 02:56:24
7	Hakan Celik	0.04 s	Python 3	2017-12-18 21:21:44
8	Guðni Natan Gunnarsson	0.04 s	Python 3	2018-02-13 16:21:37
9	James Hamm	0.04 s	Python 3	2018-05-09 01:12:35
10	Joseph Campbell	0.04 s	Python 3	2018-05-20 19:42:40

#	User	Runtime	Language	Date
1	Bharathi Kandasamy	0.08 s	Ruby	2021-04-17 23:09:01
2	Caspar Wikström	0.10 s	Ruby	2021-05-24 10:04:07
3	Patrick Elsen	0.16 s	Ruby	2019-05-02 18:53:55

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2024-09-30 20:17:59
2	Lukas Dutrieux	0.00 s	Rust	2025-08-28 03:24:03
3	Klas af Geijerstam	0.01 s	Rust	2020-11-18 11:26:14
4	Bas Dirks	0.01 s	Rust	2022-01-26 22:04:44

#	User	Runtime	Language	Date
1	Venkatkumar Murugesan	0.08 s	TypeScript	2024-02-04 20:56:39

#	User	Length	Language	Date
1	Hidden user	914	C	2024-09-01 00:56:59
2	Bernd Schmidt	924	C	2017-06-03 01:48:11
3	Luca Dolci	1115	C	2019-03-14 22:04:19
4	Mikael Magnusson	1185	C	2017-01-16 17:36:44
5	Sambit Palit	1466	C	2020-11-18 05:01:04
6	Avanish Mallya	1478	C	2026-01-21 00:02:17
7	Seth Carter	1523	C	2017-11-16 17:55:15
8	Ledion Daja	1867	C	2023-02-20 15:28:24
9	Maksym Shylo	2012	C	2022-10-25 23:48:53
10	Ferenc Rékasi	2534	C	2021-12-14 12:56:53

#	User	Length	Language	Date
1	Jorge Antunes	1310	C#	2025-10-17 21:07:09
2	Linus Yng	1378	C#	2017-05-31 11:17:47
3	David Sithole	1461	C#	2024-02-29 05:01:14
4	Hidden user	1525	C#	2021-12-23 18:04:51
5	Márton Krauter	1554	C#	2023-07-21 00:22:57
6	Anton Thunman Jonsson	1566	C#	2022-04-12 15:01:17
7	Cássio Leite	1567	C#	2024-07-10 18:58:33
8	Apurv Parekh	1572	C#	2019-02-22 19:16:49
9	Muthusamy Ramasamy	1587	C#	2021-04-17 17:14:39
10	Taqui	1648	C#	2022-05-24 21:33:09

#	User	Length	Language	Date
1	William Gan	535	C++	2018-01-26 17:03:35
2	Emmanuel Anaya	539	C++	2020-11-02 03:32:48
3	Herman Karlsson	581	C++	2016-01-23 17:10:25
4	Hidden user	585	C++	2024-11-25 17:52:29
5	WU DI	626	C++	2022-12-14 15:53:57
6	Illia Zakharov	633	C++	2023-04-27 16:53:45
7	Si Jun Ke	651	C++	2016-02-29 12:13:23
8	Tran Tuong Minh Nguyen	654	C++	2019-05-14 22:06:13
9	tarflah	656	C++	2016-12-05 15:26:36
10	Johan Wind	676	C++	2018-03-20 23:26:58

#	User	Length	Language	Date
1	Hidden user	1461	Common Lisp	2019-07-17 21:23:42

#	User	Length	Language	Date
1	Nicholas Miettinen	959	Go	2023-06-11 13:17:41
2	Norbert Voelker	1084	Go	2021-11-13 21:59:10
3	Marcus Asplund	2190	Go	2025-05-08 11:05:49

#	User	Length	Language	Date
1	Ryan Yates	602	Haskell	2019-05-24 17:19:13
2	Jan Hlavacek	794	Haskell	2016-11-23 04:12:29
3	Øyvind Almli	827	Haskell	2021-11-14 02:11:41
4	Isaac Arvestad	988	Haskell	2019-03-09 11:32:11
5	Antony Lee	1040	Haskell	2020-05-13 18:42:33
6	Tim Put	1072	Haskell	2021-06-02 23:17:10
7	Steinar Simonnes	1109	Haskell	2025-09-12 21:27:10
8	Mikail Khan	1399	Haskell	2022-01-14 19:48:38
9	Brent Yorgey	1448	Haskell	2018-05-03 04:51:16

#	User	Length	Language	Date
1	Zimu Qin	925	Java	2015-10-02 00:00:37
2	Doug Goodman	1000	Java	2018-01-03 18:48:03
3	Ian Leow	1046	Java	2015-12-07 14:20:19
4	Micah Stairs	1088	Java	2016-09-10 00:46:23
5	Sebastian Cavallin	1125	Java	2017-11-03 15:13:47
6	Jake Crampton	1142	Java	2019-10-30 00:14:22
7	Frank Ruskey	1145	Java	2017-09-23 23:17:13
8	Munir Kudrati-Plummer	1145	Java	2026-01-18 22:46:29
9	Gísli Freyr Sæmundsson	1146	Java	2017-10-30 17:37:24
10	Aarush Patil	1165	Java	2024-09-10 07:49:42

#	User	Length	Language	Date
1	Jakob Bergendahl	727	JavaScript (Node.js)	2026-01-16 17:41:52
2	Miguel Silva	903	JavaScript (Node.js)	2024-07-10 23:54:51
3	Abirami Pmr	1115	JavaScript (Node.js)	2024-02-04 18:16:46
4	Christian Forsberg	1124	JavaScript (Node.js)	2021-04-18 12:13:28
5	Gurpartap Singh Bhatti	1184	JavaScript (Node.js)	2019-03-09 20:35:32
6	Sander Hellesø	1215	JavaScript (Node.js)	2019-04-26 04:35:37
7	Slawomir Malusecki	1231	JavaScript (Node.js)	2022-10-10 02:03:37
8	Juliana Silva	1310	JavaScript (Node.js)	2026-02-24 03:15:32
9	Olga Prikhodko	1428	JavaScript (Node.js)	2023-12-07 21:04:56
10	Diogo Guedes	1432	JavaScript (Node.js)	2024-07-01 12:12:15

#	User	Length	Language	Date
1	Zachary DeStefano	608	JavaScript (SpiderMonkey)	2019-09-28 23:01:24
2	Peter Kedemo	651	JavaScript (SpiderMonkey)	2016-01-01 19:38:34
3	Bjørn Chr. Soltvedt	716	JavaScript (SpiderMonkey)	2016-02-29 16:41:09
4	Christian Pilegaard Cederquist	756	JavaScript (SpiderMonkey)	2023-07-23 12:11:41
5	J M	870	JavaScript (SpiderMonkey)	2016-10-28 14:40:54

#	User	Length	Language	Date
1	Hidden user	261	Julia	2025-09-08 20:30:59
2	Timothy Gaede	1002	Julia	2024-06-06 05:33:15

#	User	Length	Language	Date
1	Hidden user	864	Kotlin	2017-12-11 08:43:42
2	Nuno Silva	2259	Kotlin	2025-10-01 17:52:03

#	User	Length	Language	Date
1	Autumn Evelyn Dzian	1893	OCaml	2021-04-17 22:03:15

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1946	Pascal	2019-10-08 19:40:46

#	User	Length	Language	Date
1	Pedro Gaspar	1415	PHP	2025-09-28 21:33:03
2	João Vasconcelos	1608	PHP	2024-11-21 17:33:05
3	Emerson Nunes	2009	PHP	2025-12-18 17:13:31
4	Anthony Galea	3942	PHP	2021-01-16 22:15:06

#	User	Length	Language	Date
1	Andriy Zyevakov	3534	Prolog	2018-11-24 14:02:47

#	User	Length	Language	Date
1	Thomas Feld	300	Python 2	2019-12-06 13:34:08
2	Andreas Björklund	437	Python 2	2020-10-25 17:03:26
3	Jesper Öqvist	470	Python 2	2019-03-10 13:54:40
4	Johan Lyts	512	Python 2	2019-12-21 15:14:59
5	Wang Zhi Jian	527	Python 2	2019-05-08 08:56:14
6	Neal Zane	530	Python 2	2016-08-08 03:15:32
7	Kasper Borys	538	Python 2	2020-03-08 20:45:51
8	Mathis Hammel	568	Python 2	2016-11-24 16:58:56
9	Johann Ly	573	Python 2	2018-12-18 08:31:34
10	Tomas Alvarez	579	Python 2	2017-11-01 21:21:37

#	User	Length	Language	Date
1	Ahmed Chamseddine	253	Python 3	2025-10-20 19:49:40
2	Peter Stauder	276	Python 3	2023-03-30 21:52:29
3	Simon Baeckelant	278	Python 3	2024-12-02 06:39:26
4	Sergio Vieri	357	Python 3	2018-02-27 09:43:30
5	Hrant Hovhannisyan	358	Python 3	2025-11-03 09:04:34
6	Nicholas Russell Saerang	369	Python 3	2023-08-13 10:50:31
7	Shashank Bhatt	373	Python 3	2023-07-30 03:44:10
8	Magnus Eide-Fredriksen	383	Python 3	2024-10-22 22:55:25
9	Munir Kudrati-Plummer	391	Python 3	2026-01-14 18:11:45
10	Ciara Godwin	395	Python 3	2017-08-19 12:42:49

#	User	Length	Language	Date
1	Patrick Elsen	1310	Ruby	2019-05-02 18:53:55
2	Bharathi Kandasamy	1350	Ruby	2021-04-17 23:09:01
3	Caspar Wikström	1361	Ruby	2021-05-24 10:04:07

#	User	Length	Language	Date
1	Bas Dirks	1589	Rust	2022-01-26 22:04:44
2	Lukas Dutrieux	1974	Rust	2025-08-28 03:24:03
3	Klas af Geijerstam	6443	Rust	2020-11-18 11:26:14
4	Vincent Lagerros	16889	Rust	2024-09-30 20:17:59

#	User	Length	Language	Date
1	Venkatkumar Murugesan	1387	TypeScript	2024-02-04 20:56:39

Solution running time distribution