Problem I
Lamps — Problem Statistics

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Submissions	3369
Accepted submissions	2216
Submission ratio	65.78%
Authors	946
Full solves [?]	719
Full solve Ratio	76.00%

#	User	Score	Language	Date
1	Matzuka	33	APL	2025-03-01 10:59:07

#	User	Score	Language	Date
1	Chenzhang Hu	100	Bash	2023-10-04 08:25:50

#	User	Score	Language	Date
1	Bergur Snorrason	100	C	2021-10-11 19:30:44
2	Eyleifur Bjarkason	100	C	2021-10-13 22:42:50
3	Morgan Kromer	100	C	2022-05-02 16:28:32
4	Scott Sherlock	100	C	2022-09-01 19:45:29
5	Hakan Yurt	100	C	2023-01-31 23:11:43
6	Szymon Kucharski	100	C	2023-02-23 15:33:33
7	Cooper Davis	100	C	2024-02-22 00:19:34
8	Allan Nouri	100	C	2024-03-15 18:49:30
9	Roemer Caliboso	100	C	2024-08-29 23:16:01
10	Adam Lindström	100	C	2025-11-24 15:36:33

#	User	Score	Language	Date
1	Laurits Brodal	100	F#	2024-04-19 14:58:16
2	Katrine Sandø	100	F#	2025-04-18 14:40:14

#	User	Score	Language	Date
1	Norbert Voelker	100	Go	2021-10-22 22:59:41
2	Hidden user	100	Go	2023-03-06 22:49:22
3	Joachim Borup	100	Go	2024-11-22 15:59:33
4	Robin Helgelin	100	Go	2025-12-09 14:53:09
5	Marcus Asplund	33	Go	2022-02-06 12:15:30

#	User	Score	Language	Date
1	Samuel Högfeldt	100	JavaScript (Node.js)	2022-08-26 23:46:20
2	Mustafa Aldaher	100	JavaScript (Node.js)	2023-10-26 01:34:16
3	Jesper Svendgaard Åhman Hansen	33	JavaScript (Node.js)	2023-01-30 19:20:29

#	User	Score	Language	Date
1	Bjørn Chr. Soltvedt	100	JavaScript (SpiderMonkey)	2021-10-11 16:34:06
2	Christian Pilegaard Cederquist	100	JavaScript (SpiderMonkey)	2023-04-03 08:06:49

#	User	Score	Language	Date
1	Timothy Gaede	100	Julia	2025-06-29 07:16:58

#	User	Score	Language	Date
1	Adam Rankin	100	Kotlin	2023-09-16 19:34:51

#	User	Score	Language	Date
1	Esben Poulsen	33	Lua	2024-09-11 14:19:20

#	User	Score	Language	Date
1	Jinwoo Lee	100	Nim	2024-06-20 02:17:59

#	User	Score	Language	Date
1	Ingemar Ragnemalm	100	Pascal	2023-06-20 16:06:13

#	User	Score	Language	Date
1	Yanmarshus Bachtiar	100	Python 2	2021-11-03 02:06:58
2	Johan Lyts	100	Python 2	2022-03-27 14:51:19

#	User	Score	Language	Date
1	Thomas Feld	100	Ruby	2022-12-19 10:34:33
2	Chenzhang Hu	100	Ruby	2025-09-22 13:39:55
3	Jacob Pletcher	67	Ruby	2025-02-23 22:05:48

#	User	Score	Language	Date
1	Bas Dirks	100	Rust	2022-06-02 16:35:00
2	Jan-Erik Menzel	100	Rust	2022-06-29 17:49:38
3	David Rasch	100	Rust	2022-11-23 14:13:58
4	Artur Khuziakhmetov	100	Rust	2023-08-03 13:51:08
5	Francis Kloskowski Gniady	100	Rust	2025-02-13 13:03:12
6	Erlend B	100	Rust	2025-11-22 10:41:51
7	Erik Orring	33	Rust	2024-02-11 16:39:25

#	User	Score	Language	Date
1	Oleksii Ihnatenko	100	Zig	2024-02-16 01:34:42
2	Vemahk	100	Zig	2024-04-21 04:19:19

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.01 s	Bash	2023-10-04 08:25:50

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.00 s	C	2021-10-11 19:30:44
2	Eyleifur Bjarkason	0.00 s	C	2021-10-13 22:42:50
3	Morgan Kromer	0.00 s	C	2022-05-02 16:28:32
4	Scott Sherlock	0.00 s	C	2022-09-01 19:45:29
5	Hakan Yurt	0.00 s	C	2023-01-31 23:11:43
6	Szymon Kucharski	0.00 s	C	2023-02-23 15:33:33
7	Cooper Davis	0.00 s	C	2024-02-22 00:19:34
8	Allan Nouri	0.00 s	C	2024-03-15 18:49:30
9	Roemer Caliboso	0.00 s	C	2024-08-29 23:16:01
10	Adam Lindström	0.00 s	C	2025-11-24 15:36:33

#	User	Runtime	Language	Date
1	Martin Wallgren	0.02 s	C#	2021-10-25 23:17:39
2	Axel Ekman Håkansson	0.02 s	C#	2021-10-27 14:48:48
3	Mikael Fiala-Lundström	0.02 s	C#	2021-11-04 22:10:06
4	Hidden user	0.02 s	C#	2022-03-13 21:41:30
5	Peter Løffmann	0.02 s	C#	2022-05-01 17:29:27
6	Yushir Maharaj	0.02 s	C#	2022-09-22 14:40:09
7	Javed Dadabhay	0.02 s	C#	2022-09-22 14:49:25
8	Hidden user	0.02 s	C#	2022-09-22 14:49:40
9	Hidden user	0.02 s	C#	2022-09-22 16:01:35
10	Edward van der Vyver	0.02 s	C#	2022-09-27 14:39:37

#	User	Runtime	Language	Date
1	Laurits Brodal	0.07 s	F#	2024-04-19 14:58:16
2	Katrine Sandø	0.09 s	F#	2025-04-18 14:40:14

#	User	Runtime	Language	Date
1	Joachim Borup	0.00 s	Go	2024-11-22 15:59:33
2	Robin Helgelin	0.00 s	Go	2025-12-09 14:53:09
3	Hidden user	0.02 s	Go	2023-03-06 22:49:22
4	Norbert Voelker	0.08 s	Go	2021-10-22 22:59:41

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Haskell	2022-04-21 23:09:13
2	Leslie Yip	0.00 s	Haskell	2022-09-22 15:48:29
3	Attila Koszo	0.00 s	Haskell	2023-01-31 17:34:23
4	Charley Sheaffer	0.00 s	Haskell	2023-12-12 16:48:49
5	Vladislav Utkin	0.00 s	Haskell	2024-11-11 19:19:30
6	Stefano Farro	0.00 s	Haskell	2024-11-21 23:08:18
7	Shinji Koshida	0.00 s	Haskell	2025-01-13 09:02:49
8	Steinar Simonnes	0.00 s	Haskell	2025-02-17 10:31:08
9	Yujin Kim	0.00 s	Haskell	2025-09-01 09:10:56
10	Rasmus Söderhielm	0.00 s	Haskell	2026-01-29 16:15:24

#	User	Runtime	Language	Date
1	Marco Terán	0.05 s	Java	2024-06-22 21:50:37
2	Emil Nobrant	0.06 s	Java	2021-10-29 14:35:32
3	Crystal Sharpe	0.06 s	Java	2021-10-31 20:51:14
4	Sven Rönnbäck	0.06 s	Java	2022-05-13 22:14:11
5	Aaron Zhou	0.06 s	Java	2023-04-13 05:41:53
6	Axel Nilsson	0.06 s	Java	2023-09-26 18:45:35
7	Markus Bao	0.07 s	Java	2024-01-06 20:32:46
8	Hunter Mullen	0.08 s	Java	2025-02-24 06:09:36
9	bommbomm34	0.08 s	Java	2025-06-11 12:25:39
10	Andreas Rasmussen	0.08 s	Java	2025-07-13 11:35:16

#	User	Runtime	Language	Date
1	Mustafa Aldaher	0.04 s	JavaScript (Node.js)	2023-10-26 01:34:16
2	Samuel Högfeldt	0.08 s	JavaScript (Node.js)	2022-08-26 23:46:20

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-04-03 08:06:49
2	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2021-10-11 16:34:06

#	User	Runtime	Language	Date
1	Timothy Gaede	0.46 s	Julia	2025-06-29 07:16:58

#	User	Runtime	Language	Date
1	Adam Rankin	0.18 s	Kotlin	2023-09-16 19:34:51

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.00 s	Nim	2024-06-20 02:17:59

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2023-06-20 16:06:13

#	User	Runtime	Language	Date
1	Yanmarshus Bachtiar	0.03 s	Python 2	2021-11-03 02:06:58
2	Johan Lyts	0.03 s	Python 2	2022-03-28 14:11:58

#	User	Runtime	Language	Date
1	Yong Mao	0.04 s	Python 3	2022-07-19 16:08:21
2	Lucas Dunn	0.04 s	Python 3	2022-08-26 14:36:38
3	vance	0.04 s	Python 3	2022-09-06 11:44:11
4	Elliot Eriksson	0.04 s	Python 3	2022-09-08 12:40:23
5	Felix Larsson	0.04 s	Python 3	2022-09-08 12:41:33
6	Sari Amin	0.04 s	Python 3	2022-09-08 19:01:38
7	Pontus	0.04 s	Python 3	2022-09-09 12:40:03
8	Albin Eklund	0.04 s	Python 3	2022-09-09 12:40:42
9	Tim Jensen	0.04 s	Python 3	2022-09-09 12:40:43
10	Lukas	0.04 s	Python 3	2022-09-09 12:41:54

#	User	Runtime	Language	Date
1	Thomas Feld	0.06 s	Ruby	2022-12-19 10:34:33
2	Chenzhang Hu	0.12 s	Ruby	2025-09-22 13:39:55

#	User	Runtime	Language	Date
1	Bas Dirks	0.00 s	Rust	2022-06-02 16:35:00
2	Jan-Erik Menzel	0.00 s	Rust	2022-06-29 17:49:38
3	David Rasch	0.00 s	Rust	2022-11-23 14:13:58
4	Artur Khuziakhmetov	0.00 s	Rust	2023-08-03 13:51:08
5	Francis Kloskowski Gniady	0.00 s	Rust	2025-02-13 13:03:12
6	Erlend B	0.00 s	Rust	2025-11-22 10:41:51

#	User	Runtime	Language	Date
1	Oleksii Ihnatenko	0.00 s	Zig	2024-02-16 01:34:42
2	Vemahk	0.00 s	Zig	2024-04-21 04:19:19

#	User	Length	Language	Date
1	Chenzhang Hu	62	Bash	2023-10-04 08:25:50

#	User	Length	Language	Date
1	Allan Nouri	355	C	2024-03-15 18:49:30
2	Roemer Caliboso	380	C	2024-08-29 23:16:01
3	Szymon Kucharski	406	C	2023-02-23 15:33:33
4	Cooper Davis	452	C	2024-05-07 22:40:11
5	Hakan Yurt	580	C	2023-01-31 23:11:43
6	Morgan Kromer	755	C	2022-05-02 16:28:32
7	Scott Sherlock	862	C	2022-09-01 19:45:29
8	Adam Lindström	956	C	2025-11-24 15:36:33
9	Bergur Snorrason	1786	C	2021-10-11 19:30:44
10	Eyleifur Bjarkason	7495	C	2021-10-13 22:42:50

#	User	Length	Language	Date
1	Michael Damsgaard	349	C#	2024-12-23 06:10:29
2	Hidden user	530	C#	2025-11-28 22:52:50
3	Hidden user	718	C#	2026-01-15 21:23:37
4	T Steenhuis	727	C#	2025-08-27 12:10:26
5	Peter Løffmann	765	C#	2022-05-01 17:29:27
6	Alexander Kruger	807	C#	2026-01-28 09:56:07
7	Mattias Vinje	949	C#	2025-03-21 14:31:51
8	Axel Ekman Håkansson	1041	C#	2021-10-27 14:48:48
9	Hidden user	1191	C#	2022-03-13 21:41:30
10	Nabeel Mirza	1203	C#	2023-12-13 05:44:52

#	User	Length	Language	Date
1	Frans Meulenbroeks	154	C++	2025-02-27 23:21:43
2	Gabriel Andersson	234	C++	2022-02-27 10:47:07
3	Colin Hurley	269	C++	2022-05-06 07:20:18
4	Jonathan Hallström	288	C++	2022-09-04 14:21:52
5	Stepan Valerivich	288	C++	2023-08-28 23:30:09
6	Daryll Ko	298	C++	2021-12-22 15:14:16
7	Johan Sannemo	302	C++	2021-10-09 19:26:34
8	Macovei Rares	308	C++	2021-10-16 09:46:38
9	Hyunjun Lee	324	C++	2022-11-24 13:34:02
10	Jesús Pacheco Alonso	339	C++	2023-11-13 22:44:34

#	User	Length	Language	Date
1	Laurits Brodal	770	F#	2024-04-19 14:58:16
2	Katrine Sandø	1413	F#	2025-04-18 14:40:14

#	User	Length	Language	Date
1	Hidden user	229	Go	2023-03-06 22:49:22
2	Joachim Borup	520	Go	2024-11-22 15:59:33
3	Norbert Voelker	768	Go	2021-10-22 22:59:41
4	Robin Helgelin	852	Go	2025-12-09 14:53:09

#	User	Length	Language	Date
1	Leslie Yip	437	Haskell	2022-09-22 15:48:29
2	Steinar Simonnes	567	Haskell	2025-02-17 10:31:08
3	Shinji Koshida	717	Haskell	2025-01-13 09:02:49
4	Attila Koszo	773	Haskell	2023-01-31 17:34:23
5	Charley Sheaffer	801	Haskell	2023-12-12 16:48:49
6	Stefano Farro	821	Haskell	2024-11-21 23:08:18
7	Yujin Kim	837	Haskell	2025-09-01 09:10:56
8	Hidden user	1835	Haskell	2022-04-21 23:09:13
9	Vladislav Utkin	2079	Haskell	2024-11-11 19:19:30
10	Rasmus Söderhielm	2689	Haskell	2026-01-29 16:15:24

#	User	Length	Language	Date
1	Brennan Cleland	515	Java	2023-05-11 20:40:11
2	Ian Ford	575	Java	2022-02-13 22:14:11
3	Justin	589	Java	2022-01-30 02:24:17
4	Tyra Wodén	622	Java	2023-07-23 17:24:01
5	Jannik Weidenhagen	623	Java	2024-04-03 13:32:33
6	bommbomm34	640	Java	2025-06-11 12:25:39
7	Crystal Sharpe	657	Java	2021-10-31 20:51:14
8	Andreas Guldborg Hansen	752	Java	2021-10-18 11:24:38
9	Sean Pettas	783	Java	2025-08-30 14:35:31
10	Markus Bao	787	Java	2024-01-06 20:32:46

#	User	Length	Language	Date
1	Samuel Högfeldt	986	JavaScript (Node.js)	2022-08-26 23:46:20
2	Mustafa Aldaher	1218	JavaScript (Node.js)	2023-10-26 01:34:16

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	249	JavaScript (SpiderMonkey)	2023-04-03 08:06:49
2	Bjørn Chr. Soltvedt	374	JavaScript (SpiderMonkey)	2021-10-11 16:34:06

#	User	Length	Language	Date
1	Timothy Gaede	831	Julia	2025-06-29 07:16:58

#	User	Length	Language	Date
1	Adam Rankin	606	Kotlin	2023-09-16 19:34:51

#	User	Length	Language	Date
1	Jinwoo Lee	808	Nim	2024-06-20 02:29:43

#	User	Length	Language	Date
1	Ingemar Ragnemalm	713	Pascal	2023-06-20 16:06:13

#	User	Length	Language	Date
1	Yanmarshus Bachtiar	358	Python 2	2021-11-03 02:06:58
2	Johan Lyts	418	Python 2	2022-03-27 14:51:19

#	User	Length	Language	Date
1	David Llorens	107	Python 3	2025-04-26 00:21:06
2	Lee Isaac	119	Python 3	2022-12-29 09:22:27
3	Ocram Esah	126	Python 3	2022-04-07 16:22:59
4	David Aldenbro	129	Python 3	2025-10-20 13:48:54
5	Ahmed Chamseddine	136	Python 3	2025-06-23 11:36:26
6	Tai Tze Kin	137	Python 3	2024-05-03 09:46:23
7	Isaac Lee	141	Python 3	2022-04-20 04:08:32
8	Guðmundur Ellertsson	143	Python 3	2023-12-15 00:01:17
9	Hidden user	150	Python 3	2022-03-03 13:40:26
10	Andreas Björklund	152	Python 3	2023-11-14 12:29:50

#	User	Length	Language	Date
1	Thomas Feld	69	Ruby	2023-08-29 13:33:11
2	Chenzhang Hu	156	Ruby	2025-09-22 13:39:55

#	User	Length	Language	Date
1	Bas Dirks	578	Rust	2022-06-02 16:35:00
2	Artur Khuziakhmetov	589	Rust	2023-08-03 13:51:08
3	Francis Kloskowski Gniady	625	Rust	2025-02-13 13:03:12
4	David Rasch	737	Rust	2022-11-23 14:13:58
5	Jan-Erik Menzel	1020	Rust	2022-06-29 17:49:38
6	Erlend B	1165	Rust	2025-11-22 10:41:51

#	User	Length	Language	Date
1	Oleksii Ihnatenko	1299	Zig	2024-02-16 01:34:42
2	Vemahk	1716	Zig	2024-04-21 04:19:19

Solution running time distribution