Problem A
The Plank — Problem Statistics

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Submissions	3742
Accepted submissions	2304
Submission ratio	61.57%
Authors	1903
Full solves [?]	1734
Full solve Ratio	91.12%

#	User	Score	Language	Date
1	Chenzhang Hu	100	Bash	2023-10-04 06:22:57

#	User	Score	Language	Date
1	Michal Žáček	100	Common Lisp	2022-08-11 20:34:36
2	Kevin Gomez	100	Common Lisp	2025-11-23 16:41:41

#	User	Score	Language	Date
1	Jacob Harris Cryer Kragh	100	F#	2022-07-25 17:03:12
2	Addison Schmidt	100	F#	2022-08-17 13:45:17
3	Jacob To	100	F#	2023-11-15 20:31:51
4	Rasmus Streubel Nielsen	100	F#	2025-02-11 18:26:04
5	Peter Maas	100	F#	2025-02-15 19:17:44

#	User	Score	Language	Date
1	Norbert Voelker	100	Go	2021-10-19 11:45:07
2	Sergey Jakobsen	100	Go	2022-01-14 23:25:15
3	Jimmy Nejtron	100	Go	2023-09-18 17:18:53
4	Zeheng Li	100	Go	2023-11-14 16:55:30
5	Colton Palmer	100	Go	2024-01-29 20:34:16
6	Romulus Pașca	100	Go	2024-03-20 07:59:37

#	User	Score	Language	Date
1	Chris Wong	100	JavaScript (Node.js)	2022-01-23 21:24:24
2	Anders Høy Seemann Vestergaard	100	JavaScript (Node.js)	2022-06-02 14:53:41
3	Hidden user	100	JavaScript (Node.js)	2023-08-19 05:08:10

#	User	Score	Language	Date
1	Bjørn Chr. Soltvedt	100	JavaScript (SpiderMonkey)	2021-10-12 08:38:00
2	Peter Menyes	100	JavaScript (SpiderMonkey)	2021-11-06 10:18:44
3	Håkan Lindahl	100	JavaScript (SpiderMonkey)	2022-06-15 14:06:22
4	Jimmy Gustafsson	100	JavaScript (SpiderMonkey)	2022-06-17 14:07:23
5	Christian Pilegaard Cederquist	100	JavaScript (SpiderMonkey)	2022-10-21 12:18:47
6	Evan Magill	100	JavaScript (SpiderMonkey)	2024-04-18 04:43:16

#	User	Score	Language	Date
1	Timothy Gaede	100	Julia	2024-04-15 02:23:01
2	Alexandre Charland	100	Julia	2024-04-23 22:35:27

#	User	Score	Language	Date
1	Chris Johnson	100	Kotlin	2023-04-12 20:24:48
2	Adam Rankin	100	Kotlin	2023-05-01 17:25:38
3	Emil Wihlander	100	Kotlin	2023-07-25 19:50:52
4	Troy Warmboe	100	Kotlin	2024-04-05 23:39:39
5	Martijn Muijsers	100	Kotlin	2024-05-29 08:11:38

#	User	Score	Language	Date
1	Zeheng Li	100	Lua	2023-11-14 17:06:36

#	User	Score	Language	Date
1	Hidden user	100	Odin	2025-05-02 23:42:42

#	User	Score	Language	Date
1	David Connolly	100	Pascal	2022-04-08 15:40:38
2	Ingemar Ragnemalm	100	Pascal	2022-09-01 19:47:30

#	User	Score	Language	Date
1	Saito Ta	100	Perl	2024-04-18 08:16:52

#	User	Score	Language	Date
1	Øyvind Johannessen	100	PHP	2021-11-01 11:21:58
2	Renate	100	PHP	2023-07-18 23:45:16
3	Philippe Hubert	100	PHP	2023-12-31 10:22:07

#	User	Score	Language	Date
1	Hakan Kjellerstrand	100	Prolog	2023-02-13 18:21:01
2	Andriy Zyevakov	100	Prolog	2023-02-16 16:40:38

#	User	Score	Language	Date
1	Johan Lyts	100	Python 2	2021-10-12 18:52:52
2	Andreas Björklund	100	Python 2	2021-11-20 10:18:08
3	Marcel Rød	100	Python 2	2021-11-24 23:12:22
4	Yanmarshus Bachtiar	100	Python 2	2021-12-20 09:34:17
5	Sivasankaran D	100	Python 2	2025-08-02 09:58:36

#	User	Score	Language	Date
1	Jinwoo Lee	100	Racket	2025-01-26 01:27:09

#	User	Score	Language	Date
1	Thomas Feld	100	Ruby	2022-10-21 12:37:24
2	Eugen Neagoe	100	Ruby	2023-07-04 12:25:25
3	Chenzhang Hu	100	Ruby	2025-09-22 12:55:33
4	Þorsteinn Sævar Kristjánsson	100	Ruby	2025-10-03 13:04:30
5	Matzuka	100	Ruby	2025-10-25 15:17:18

#	User	Score	Language	Date
1	Grettir Heimisson	100	Zig	2025-11-06 21:26:46

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.01 s	Bash	2023-10-04 06:22:57

#	User	Runtime	Language	Date
1	Adam Grady	0.02 s	C#	2021-10-28 14:05:26
2	Mikael Fiala-Lundström	0.02 s	C#	2021-10-31 22:24:41
3	Henrik Hallbert	0.02 s	C#	2022-03-20 17:16:46
4	Stefan Forsberg	0.02 s	C#	2022-04-27 11:44:06
5	Göran Andersson	0.02 s	C#	2022-05-14 12:07:31
6	Mads Pedersen	0.02 s	C#	2022-06-06 12:52:23
7	Eric Weiss	0.02 s	C#	2022-06-10 20:31:05
8	Dan Church	0.02 s	C#	2022-06-24 14:28:09
9	Hidden user	0.02 s	C#	2022-08-28 13:49:23
10	Steven Heinen	0.04 s	C#	2023-04-19 13:27:22

#	User	Runtime	Language	Date
1	Michal Žáček	0.01 s	Common Lisp	2022-08-11 20:34:36
2	Kevin Gomez	0.01 s	Common Lisp	2025-11-23 16:41:41

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.03 s	F#	2022-07-25 17:03:12
2	Addison Schmidt	0.03 s	F#	2022-08-17 13:45:17
3	Peter Maas	0.05 s	F#	2025-02-15 19:17:44
4	Jacob To	0.08 s	F#	2023-11-15 20:31:51
5	Rasmus Streubel Nielsen	0.08 s	F#	2025-02-11 18:26:04

#	User	Runtime	Language	Date
1	Jimmy Nejtron	0.00 s	Go	2023-09-18 17:18:53
2	Zeheng Li	0.00 s	Go	2023-11-14 16:55:30
3	Colton Palmer	0.00 s	Go	2024-01-29 20:34:16
4	Romulus Pașca	0.00 s	Go	2024-03-20 07:59:37
5	Sergey Jakobsen	0.02 s	Go	2022-01-14 23:34:49
6	Norbert Voelker	0.08 s	Go	2021-10-19 11:45:07

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	Java	2024-09-20 03:14:04
2	Stela Palii	0.04 s	Java	2024-12-12 02:08:40
3	Guangyi Zhou	0.04 s	Java	2024-12-17 06:49:49
4	Goh Zhixuan Jeremiah	0.04 s	Java	2025-02-15 15:15:54
5	leo wennberg	0.04 s	Java	2025-07-29 15:27:29
6	Mark Meysenburg	0.04 s	Java	2025-10-14 15:24:49
7	Lee Heng Sheng	0.05 s	Java	2024-04-17 08:56:33
8	Ku Brian	0.05 s	Java	2024-05-01 14:53:31
9	Daniel S	0.06 s	Java	2021-10-22 05:47:51
10	Crystal Sharpe	0.06 s	Java	2021-10-31 19:40:52

#	User	Runtime	Language	Date
1	Hidden user	0.06 s	JavaScript (Node.js)	2024-09-12 19:15:20
2	Chris Wong	0.42 s	JavaScript (Node.js)	2022-01-23 21:24:24
3	Anders Høy Seemann Vestergaard	0.42 s	JavaScript (Node.js)	2022-06-02 14:53:41

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2021-10-12 08:38:00
2	Håkan Lindahl	0.02 s	JavaScript (SpiderMonkey)	2022-06-15 14:06:22
3	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2022-06-17 14:07:23
4	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2022-10-21 12:18:47
5	Evan Magill	0.03 s	JavaScript (SpiderMonkey)	2024-04-18 04:43:16
6	Peter Menyes	0.04 s	JavaScript (SpiderMonkey)	2021-11-06 10:18:44

#	User	Runtime	Language	Date
1	Alexandre Charland	0.27 s	Julia	2024-04-23 22:35:27
2	Timothy Gaede	0.49 s	Julia	2024-04-15 02:23:01

#	User	Runtime	Language	Date
1	Emil Wihlander	0.16 s	Kotlin	2023-07-25 19:50:52
2	Adam Rankin	0.18 s	Kotlin	2023-05-01 17:25:38
3	Troy Warmboe	0.18 s	Kotlin	2024-04-05 23:39:39
4	Chris Johnson	0.19 s	Kotlin	2023-04-12 20:24:48
5	Martijn Muijsers	0.19 s	Kotlin	2024-05-29 08:11:38

#	User	Runtime	Language	Date
1	Zeheng Li	0.01 s	Lua	2023-11-14 17:06:36

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-05-02 23:42:42

#	User	Runtime	Language	Date
1	David Connolly	0.00 s	Pascal	2022-04-08 15:40:38
2	Ingemar Ragnemalm	0.00 s	Pascal	2022-09-01 19:47:30

#	User	Runtime	Language	Date
1	Saito Ta	0.00 s	Perl	2024-04-18 08:16:52

#	User	Runtime	Language	Date
1	Renate	0.01 s	PHP	2023-07-18 23:45:16
2	Philippe Hubert	0.01 s	PHP	2023-12-31 10:22:07
3	Øyvind Johannessen	0.02 s	PHP	2021-11-01 11:21:58

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-13 18:21:01
2	Andriy Zyevakov	0.07 s	Prolog	2023-02-16 16:40:38

#	User	Runtime	Language	Date
1	Johan Lyts	0.03 s	Python 2	2021-10-12 18:52:52
2	Andreas Björklund	0.03 s	Python 2	2021-11-20 10:18:08
3	Marcel Rød	0.03 s	Python 2	2021-11-24 23:12:22
4	Yanmarshus Bachtiar	0.03 s	Python 2	2021-12-20 09:34:17
5	Sivasankaran D	0.07 s	Python 2	2025-08-02 09:58:36

#	User	Runtime	Language	Date
1	Henry Xia	0.04 s	Python 3	2022-06-06 05:05:23
2	Petr	0.04 s	Python 3	2022-06-08 10:29:55
3	Frode Sandberg	0.04 s	Python 3	2022-06-15 13:53:43
4	Filip Kana	0.04 s	Python 3	2022-06-16 09:36:58
5	Björn Fi	0.04 s	Python 3	2022-06-17 20:39:04
6	Anders Dahl	0.04 s	Python 3	2022-06-19 20:32:09
7	Robin Fumei	0.04 s	Python 3	2022-06-20 14:06:12
8	Joakim Nylund	0.04 s	Python 3	2022-06-21 11:01:54
9	Tobias Glimmerfors	0.04 s	Python 3	2022-07-01 14:07:11
10	Elias Lundell	0.04 s	Python 3	2022-07-01 14:15:21

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.23 s	Racket	2025-01-26 01:30:49

#	User	Runtime	Language	Date
1	Thomas Feld	0.06 s	Ruby	2022-10-21 12:37:24
2	Eugen Neagoe	0.06 s	Ruby	2023-07-04 12:25:25
3	Þorsteinn Sævar Kristjánsson	0.06 s	Ruby	2025-10-03 13:04:30
4	Matzuka	0.07 s	Ruby	2025-10-25 15:17:18
5	Chenzhang Hu	0.13 s	Ruby	2025-09-22 12:55:33

#	User	Runtime	Language	Date
1	Grettir Heimisson	0.00 s	Zig	2025-11-06 21:26:46

#	User	Length	Language	Date
1	Chenzhang Hu	48	Bash	2025-09-13 16:12:43

#	User	Length	Language	Date
1	Martin Blom	87	C	2023-10-15 20:28:27
2	Joel Scarinius	218	C	2023-08-07 14:50:13
3	Colton Palmer	252	C	2024-01-27 21:54:04
4	Mirel Cosulschi	253	C	2024-10-04 16:18:52
5	Oscar Kamf	282	C	2022-06-21 12:18:26
6	Cameron Fairlie	286	C	2024-11-27 12:43:41
7	Drake Farrokhi	306	C	2023-12-24 00:51:44
8	Alexander Bilde Pedersen	331	C	2023-09-27 12:23:58
9	Børge Bjørnstadjordet	331	C	2024-07-24 12:58:47
10	Dylan Strickley	335	C	2022-05-23 19:55:44

#	User	Length	Language	Date
1	traxex	160	C#	2024-04-29 14:30:02
2	Gregory Sinclair	166	C#	2023-11-05 16:46:20
3	Hidden user	397	C#	2025-12-02 17:26:59
4	Henrik Hallbert	398	C#	2022-03-20 17:16:46
5	Erik Rabe	407	C#	2023-12-05 13:34:47
6	Anthony Ye	441	C#	2023-12-03 18:02:39
7	Esty Crow	460	C#	2023-12-03 05:48:05
8	Adam Grady	470	C#	2021-10-28 14:05:26
9	Michael Damsgaard	507	C#	2025-01-05 08:48:03
10	Benjamin Applegate	525	C#	2023-09-27 22:46:21

#	User	Length	Language	Date
1	Taylor Rodríguez	102	C++	2025-01-18 19:13:40
2	Frans Meulenbroeks	132	C++	2025-05-06 20:34:01
3	Mathias Gernez	156	C++	2025-06-06 20:10:06
4	森林	157	C++	2023-12-14 12:34:43
5	10360051 10360051	163	C++	2023-12-14 09:52:53
6	Brynjar Geir Sigurðsson	177	C++	2022-03-28 15:45:26
7	Pietro Agnoli	181	C++	2022-11-26 17:36:55
8	Eric Chin	184	C++	2023-01-13 05:27:11
9	Kevin Lin	186	C++	2024-01-11 12:36:02
10	Hidden user	204	C++	2022-05-24 11:59:17

#	User	Length	Language	Date
1	Kevin Gomez	72	Common Lisp	2025-11-23 16:41:41
2	Michal Žáček	168	Common Lisp	2022-08-11 20:34:36

#	User	Length	Language	Date
1	Addison Schmidt	185	F#	2022-08-17 13:45:17
2	Rasmus Streubel Nielsen	227	F#	2025-02-11 18:26:04
3	Peter Maas	252	F#	2025-07-18 20:59:42
4	Jacob Harris Cryer Kragh	262	F#	2022-07-25 17:03:12
5	Jacob To	265	F#	2023-11-15 20:31:51

#	User	Length	Language	Date
1	Sergey Jakobsen	197	Go	2022-01-14 23:25:15
2	Zeheng Li	294	Go	2023-11-14 16:55:30
3	Colton Palmer	375	Go	2024-01-29 20:34:16
4	Jimmy Nejtron	461	Go	2023-09-18 17:18:53
5	Norbert Voelker	464	Go	2021-10-19 11:45:07
6	Romulus Pașca	563	Go	2024-03-20 07:59:37

#	User	Length	Language	Date
1	Zach Tschetter	87	Haskell	2021-10-26 02:37:52
2	Hidden user	98	Haskell	2021-10-25 01:08:09
3	Sebastian Banert	118	Haskell	2023-03-31 21:34:39
4	Øyvind Almli	184	Haskell	2021-11-01 11:03:34
5	Sebastian Paaske Tørholm	188	Haskell	2022-12-25 20:17:52
6	Christian Leipe	213	Haskell	2022-01-11 13:35:17
7	Steinar Simonnes	260	Haskell	2024-01-15 11:09:55
8	Ludvig Gunne Lindström	268	Haskell	2024-02-03 13:13:36
9	Hidden user	283	Haskell	2023-09-17 16:36:02
10	Ng Tek In	292	Haskell	2022-08-11 08:32:42

#	User	Length	Language	Date
1	Rasmus Poulsen	254	Java	2023-10-25 21:13:23
2	Lim Ting Kai	332	Java	2023-08-30 07:10:28
3	Anton Sandin	351	Java	2022-04-27 17:23:57
4	Felix Fatum	361	Java	2023-09-17 15:18:52
5	Said RIZQUE	363	Java	2021-11-08 21:59:48
6	Adrian Wireklint	386	Java	2021-11-07 15:07:25
7	Santiago Prieto	386	Java	2022-09-17 22:03:39
8	Kumar Chakraborty	390	Java	2023-05-28 03:22:24
9	Hidden user	395	Java	2022-03-25 18:50:06
10	Thomas King	399	Java	2024-06-24 16:33:31

#	User	Length	Language	Date
1	Hidden user	451	JavaScript (Node.js)	2023-08-19 05:08:10
2	Chris Wong	665	JavaScript (Node.js)	2022-01-23 21:24:24
3	Anders Høy Seemann Vestergaard	841	JavaScript (Node.js)	2022-06-02 14:53:41

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	55	JavaScript (SpiderMonkey)	2022-10-21 12:38:16
2	Bjørn Chr. Soltvedt	177	JavaScript (SpiderMonkey)	2021-10-12 08:38:00
3	Evan Magill	235	JavaScript (SpiderMonkey)	2024-04-18 04:43:16
4	Håkan Lindahl	311	JavaScript (SpiderMonkey)	2022-06-15 14:06:22
5	Jimmy Gustafsson	574	JavaScript (SpiderMonkey)	2022-06-17 14:07:23
6	Peter Menyes	1308	JavaScript (SpiderMonkey)	2021-11-06 10:18:44

#	User	Length	Language	Date
1	Alexandre Charland	100	Julia	2024-04-23 22:36:00
2	Timothy Gaede	960	Julia	2024-04-15 02:23:01

#	User	Length	Language	Date
1	Troy Warmboe	233	Kotlin	2024-04-05 23:39:39
2	Chris Johnson	340	Kotlin	2023-04-12 20:24:48
3	Emil Wihlander	386	Kotlin	2023-07-25 19:50:52
4	Adam Rankin	424	Kotlin	2023-05-01 17:25:38
5	Martijn Muijsers	603	Kotlin	2024-05-29 08:11:38

#	User	Length	Language	Date
1	Zeheng Li	222	Lua	2023-11-14 17:06:36

#	User	Length	Language	Date
1	Hidden user	655	Odin	2025-05-02 23:42:42

#	User	Length	Language	Date
1	Ingemar Ragnemalm	343	Pascal	2022-09-01 19:47:30
2	David Connolly	511	Pascal	2022-04-08 15:40:38

#	User	Length	Language	Date
1	Saito Ta	70	Perl	2024-04-18 08:16:52

#	User	Length	Language	Date
1	Renate	281	PHP	2023-07-18 23:45:16
2	Øyvind Johannessen	329	PHP	2021-11-01 11:21:58
3	Philippe Hubert	1497	PHP	2023-12-31 10:22:07

#	User	Length	Language	Date
1	Hakan Kjellerstrand	230	Prolog	2023-02-13 18:21:01
2	Andriy Zyevakov	788	Prolog	2023-02-16 16:40:38

#	User	Length	Language	Date
1	Andreas Björklund	138	Python 2	2021-11-20 10:18:08
2	Johan Lyts	168	Python 2	2021-10-12 18:52:52
3	Sivasankaran D	215	Python 2	2025-08-02 09:58:36
4	Marcel Rød	410	Python 2	2021-11-24 23:12:22
5	Yanmarshus Bachtiar	718	Python 2	2021-12-20 09:34:17

#	User	Length	Language	Date
1	Eugin Pahk	48	Python 3	2023-09-24 04:47:54
2	Kevin Gomez	49	Python 3	2025-05-19 06:24:37
3	Shashank Bhatt	51	Python 3	2023-09-24 04:30:38
4	Simon Hellsten	54	Python 3	2023-08-15 21:21:49
5	Thomas Feld	56	Python 3	2022-10-21 12:33:27
6	Joey Pabalan	60	Python 3	2025-11-19 01:55:30
7	Benjamin Z White	61	Python 3	2023-05-04 19:08:08
8	Farzam Abrishami	61	Python 3	2025-05-04 15:08:42
9	Christopher Jernberg	69	Python 3	2022-12-25 15:03:25
10	Błażej Dariusz Roszkowski	72	Python 3	2022-12-24 12:52:20

#	User	Length	Language	Date
1	Jinwoo Lee	329	Racket	2025-01-26 01:30:49

#	User	Length	Language	Date
1	Thomas Feld	45	Ruby	2022-12-08 15:25:42
2	Chenzhang Hu	145	Ruby	2025-09-22 12:55:33
3	Eugen Neagoe	156	Ruby	2023-07-04 12:25:25
4	Matzuka	175	Ruby	2025-10-25 15:17:18
5	Þorsteinn Sævar Kristjánsson	320	Ruby	2025-10-03 13:04:30

#	User	Length	Language	Date
1	David Aldenbro	167	Rust	2023-10-25 18:56:25
2	Vincent Lagerros	277	Rust	2025-01-02 00:36:40
3	David Rasch	413	Rust	2022-05-26 15:51:45
4	Pankajkumar Patro	419	Rust	2024-09-29 12:09:20
5	Harald Langslet Kavli	419	Rust	2025-12-14 22:25:11
6	Kohlton Booth	428	Rust	2022-02-27 20:35:08
7	Ryan Mueller	454	Rust	2023-12-19 13:43:38
8	Emil Dichmann	465	Rust	2025-08-23 21:04:45
9	Hector Thøgersen	471	Rust	2024-03-11 11:34:17
10	Wilmer Johansen	474	Rust	2025-08-03 20:37:51

#	User	Length	Language	Date
1	Grettir Heimisson	2336	Zig	2025-11-06 21:26:46

Solution running time distribution