Problem A
Flexible Spaces — Problem Statistics

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Submissions	11376
Accepted submissions	6015
Submission ratio	52.87%
Authors	5187
Full solves [?]	4829
Full solve Ratio	93.10%

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-11-23 12:00:58
2	Chenzhang Hu	0.09 s	Bash	2024-04-16 16:26:41

#	User	Runtime	Language	Date
1	Jon Wong	0.02 s	C#	2014-10-03 04:16:18
2	Ayk Stepanyan	0.02 s	C#	2014-10-18 12:55:58
3	masosz	0.02 s	C#	2015-01-21 10:07:57
4	Bas te Kolste	0.02 s	C#	2015-06-17 17:34:06
5	Mads Storm Hansen	0.02 s	C#	2015-07-17 21:28:28
6	Daouda Camara	0.02 s	C#	2015-09-06 21:09:39
7	Patrick Johannessen	0.02 s	C#	2015-12-16 08:39:25
8	Joe Amenta	0.02 s	C#	2016-04-05 00:22:19
9	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-05-10 16:32:35
10	lobo	0.02 s	C#	2016-05-23 18:18:52

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.05 s	F#	2022-09-04 10:42:15
2	Mads Jespersen	0.06 s	F#	2020-02-27 00:57:45

#	User	Runtime	Language	Date
1	Aaron Nichols	0.00 s	Go	2024-01-30 00:51:48
2	Nathan Lee	0.00 s	Go	2025-09-06 20:02:17
3	Georgios Leandros Kyriazis	0.02 s	Go	2023-02-24 15:48:45
4	Krzysztof Gibuła	0.07 s	Go	2019-03-13 22:29:50
5	Sander Hellesø	0.07 s	Go	2019-04-10 07:28:15
6	Miguel Martinez	0.08 s	Go	2019-07-20 13:49:11
7	Norbert Voelker	0.08 s	Go	2021-04-20 13:56:24
8	Jack Kryger Sørensen	0.08 s	Go	2022-01-26 14:07:10
9	Neal McCarthy	0.09 s	Go	2018-04-17 16:37:28

#	User	Runtime	Language	Date
1	Petr Ryšavý	0.05 s	Java	2015-02-25 01:19:17
2	Terrence Park	0.05 s	Java	2015-12-25 00:52:08
3	Marco Vincenzo Karaan	0.05 s	Java	2016-01-30 06:39:24
4	Emílio Weba	0.05 s	Java	2016-04-26 01:44:40
5	Alice Heavey	0.05 s	Java	2016-04-29 19:13:12
6	Ross Sowell	0.05 s	Java	2016-05-31 06:15:11
7	William Fiset	0.05 s	Java	2016-06-01 01:36:21
8	Kristian Rosland	0.05 s	Java	2016-09-24 13:30:04
9	Thanh Quach	0.05 s	Java	2017-03-12 05:20:16
10	Shehryar Assad	0.05 s	Java	2017-08-13 05:48:58

#	User	Runtime	Language	Date
1	Saleth Ibarra	0.04 s	JavaScript (Node.js)	2025-08-29 01:49:38
2	Edixon	0.04 s	JavaScript (Node.js)	2025-08-29 02:01:31
3	Stephanie Keck	0.42 s	JavaScript (Node.js)	2020-01-19 06:17:07
4	Kevin Ma	0.42 s	JavaScript (Node.js)	2020-07-07 15:28:55
5	Richard Alison	0.42 s	JavaScript (Node.js)	2020-10-04 12:59:15
6	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-10 10:21:30
7	Chris Wong	0.42 s	JavaScript (Node.js)	2021-02-21 15:59:58
8	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-03-04 20:08:02

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-19 15:56:19
2	Alan Delaney	0.01 s	JavaScript (SpiderMonkey)	2017-04-20 16:09:24
3	Peter Kedemo	0.02 s	JavaScript (SpiderMonkey)	2015-12-23 00:31:00
4	Paul Leung	0.02 s	JavaScript (SpiderMonkey)	2017-02-20 12:30:12
5	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-12 15:33:48
6	Johannes Strelen	0.03 s	JavaScript (SpiderMonkey)	2018-12-07 10:31:56
7	Steven Tang	0.03 s	JavaScript (SpiderMonkey)	2019-11-11 01:19:20
8	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-08-18 17:18:58
9	Jimmy Gustafsson	0.05 s	JavaScript (SpiderMonkey)	2024-06-17 12:31:43
10	Andri Andresson	0.36 s	JavaScript (SpiderMonkey)	2018-05-11 15:58:27

#	User	Runtime	Language	Date
1	Timothy Gaede	0.55 s	Julia	2024-05-01 06:28:21
2	Danny Robinson	0.71 s	Julia	2023-11-23 11:47:17
3	Noszály Csaba	0.79 s	Julia	2025-03-02 22:17:26

#	User	Runtime	Language	Date
1	Jacob Huebner	0.13 s	Kotlin	2021-02-12 02:12:18
2	Nicholas Johnson	0.15 s	Kotlin	2021-02-12 02:19:08
3	Johnny Baloney	0.15 s	Kotlin	2022-02-23 11:57:20
4	Danny Mittal	0.16 s	Kotlin	2021-02-12 02:22:54
5	Hidden user	0.19 s	Kotlin	2017-11-23 06:28:08
6	Dayan Ruben Gonzalez	0.21 s	Kotlin	2020-10-01 05:17:08
7	Adam Rankin	0.21 s	Kotlin	2023-08-25 19:20:38
8	Dmitry Shostak	0.22 s	Kotlin	2018-08-21 07:27:51
9	Neil Harmon	0.22 s	Kotlin	2019-05-16 09:21:37
10	Adam Koprowski	0.22 s	Kotlin	2020-11-28 21:10:22

#	User	Runtime	Language	Date
1	Joel Newman	0.00 s	OCaml	2023-11-23 02:08:10

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2017-08-15 10:02:23
2	Khoa Ngo Duc Minh	0.00 s	Pascal	2021-10-12 13:46:00

#	User	Runtime	Language	Date
1	Andre Wahyudi	0.01 s	PHP	2023-03-17 04:29:31
2	Renate	0.01 s	PHP	2023-07-27 00:50:32

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Prolog	2014-12-02 11:10:55
2	Erik Dackander	0.01 s	Prolog	2014-12-04 15:40:19
3	Jorge Andres Munoz Caceres	0.01 s	Prolog	2014-12-08 19:08:56
4	Victor Ähdel	0.01 s	Prolog	2015-01-15 13:48:46
5	Daniel Millevik	0.01 s	Prolog	2015-02-19 02:26:49
6	Hidden user	0.01 s	Prolog	2015-07-08 12:20:01
7	Emma Nimstad	0.01 s	Prolog	2015-10-26 11:21:43
8	Johan Sjöblom	0.01 s	Prolog	2015-11-25 12:19:55
9	Alexander Viklund	0.01 s	Prolog	2015-11-28 03:46:09
10	Davis Freimanis	0.01 s	Prolog	2016-03-25 20:48:06

#	User	Runtime	Language	Date
1	Hidden user	0.03 s	Python 2	2014-09-28 02:39:51
2	Martin Stensgård	0.03 s	Python 2	2014-11-26 03:19:53
3	Daniel Palmqvist	0.03 s	Python 2	2014-12-24 18:59:59
4	Paulo Bu	0.03 s	Python 2	2015-01-30 15:17:41
5	Hidden user	0.03 s	Python 2	2015-02-20 18:04:23
6	Kristmundur Agust	0.03 s	Python 2	2015-02-26 22:34:52
7	Christofer Ohlsson	0.03 s	Python 2	2015-04-15 14:44:37
8	Erik Odenman	0.03 s	Python 2	2015-05-10 21:33:08
9	Team Baud	0.03 s	Python 2	2015-07-07 18:16:33
10	Fredrik Carlsen	0.03 s	Python 2	2015-07-18 22:38:22

#	User	Runtime	Language	Date
1	Hidden user	0.02 s	Python 3	2014-10-13 16:05:54
2	Urban Pettersson	0.02 s	Python 3	2015-01-28 21:14:45
3	Nils Gustafsson	0.02 s	Python 3	2015-03-31 19:33:30
4	Brian Harrington	0.02 s	Python 3	2015-04-16 21:59:32
5	James Elías Sigurðarson	0.02 s	Python 3	2015-06-02 17:24:33
6	Fredrik Carlsen	0.02 s	Python 3	2015-07-18 22:46:17
7	Tilen	0.02 s	Python 3	2015-08-04 20:50:48
8	John Harrison	0.02 s	Python 3	2015-09-27 19:32:00
9	Emil Riis Hansen	0.02 s	Python 3	2015-10-26 10:43:08
10	Wayne	0.02 s	Python 3	2016-01-31 18:12:15

#	User	Runtime	Language	Date
1	Yaman Shiekh Deia	0.03 s	Ruby	2016-05-15 02:10:33
2	Martin Larsson	0.03 s	Ruby	2017-03-04 14:43:12
3	Daniel Harder	0.04 s	Ruby	2018-09-01 04:00:01
4	Hidden user	0.04 s	Ruby	2019-03-04 12:51:24
5	Hidden user	0.04 s	Ruby	2019-11-10 17:55:47
6	Lara Hoya Trujillo	0.04 s	Ruby	2019-11-17 18:56:57
7	Patricia Gao	0.05 s	Ruby	2020-01-24 10:59:57
8	Erik Rydbert	0.06 s	Ruby	2016-07-11 05:55:39
9	Thomas Feld	0.06 s	Ruby	2023-02-09 09:19:45
10	Alghi Fariansyah	0.10 s	Ruby	2020-10-29 18:17:09

#	User	Runtime	Language	Date
1	Diego Mauricio Ortiz Sanchez	0.05 s	TypeScript	2025-08-29 01:10:28

#	User	Length	Language	Date
1	Danny Robinson	116	Bash	2023-11-23 12:00:58
2	Chenzhang Hu	1600	Bash	2024-04-16 16:26:41

#	User	Length	Language	Date
1	Martin Blom	185	C	2024-01-30 19:29:43
2	Kendall Schmit	187	C	2018-01-09 23:53:49
3	Dalton Parker Caron	240	C	2018-01-09 02:09:48
4	Mikael K Eriksson	394	C	2021-02-08 12:46:37
5	Matthew Weston	415	C	2022-01-22 17:52:15
6	Mirel Cosulschi	417	C	2023-11-21 22:14:20
7	Hidden user	445	C	2018-11-03 16:04:37
8	Veda Prakash Cherukuru	453	C	2015-09-05 08:29:12
9	劉睿升	456	C	2021-06-12 15:35:50
10	劉睿升	456	C	2021-06-24 16:36:55

#	User	Length	Language	Date
1	Robert Low	665	C#	2016-07-17 00:01:43
2	Anthony Ye	718	C#	2023-10-01 18:59:20
3	Liam Percy	770	C#	2019-01-13 22:47:31
4	Esty Crow	838	C#	2023-09-30 03:33:09
5	Petra Marc	843	C#	2022-07-09 12:24:00
6	Göran Andersson	853	C#	2022-05-15 15:34:48
7	Bas te Kolste	887	C#	2015-06-17 17:34:06
8	Thomas Norris	905	C#	2019-06-25 01:59:40
9	Gustav Kalander	915	C#	2018-09-15 10:02:12
10	Benjamin Bilbeau	920	C#	2024-07-23 17:32:22

#	User	Length	Language	Date
1	Frans Meulenbroeks	264	C++	2025-02-14 08:04:33
2	Yipeng Yang	300	C++	2021-02-12 02:16:57
3	Yash Kumar Bansal	305	C++	2015-09-05 07:20:35
4	Anna Roczek	308	C++	2023-08-23 12:17:47
5	林育霆	310	C++	2023-12-24 07:28:13
6	陳小宇	311	C++	2020-04-12 12:11:44
7	Gunnar Bjorn	311	C++	2023-01-26 11:14:56
8	Syifa Khanza Naura	313	C++	2024-01-11 16:15:53
9	bekarhunmain	317	C++	2024-06-23 15:47:15
10	Saeed Odak	324	C++	2017-03-03 00:17:52

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	652	F#	2022-09-04 10:42:15
2	Mads Jespersen	721	F#	2020-02-27 00:57:45

#	User	Length	Language	Date
1	Neal McCarthy	423	Go	2018-04-17 16:37:28
2	Jack Kryger Sørensen	612	Go	2022-01-26 14:07:10
3	Miguel Martinez	645	Go	2019-07-20 13:49:11
4	Georgios Leandros Kyriazis	752	Go	2023-02-24 15:48:45
5	Norbert Voelker	803	Go	2021-04-20 13:56:24
6	Krzysztof Gibuła	809	Go	2019-03-13 22:29:50
7	Nathan Lee	917	Go	2025-09-06 20:02:17
8	Aaron Nichols	1108	Go	2024-01-30 00:51:48
9	Sander Hellesø	1322	Go	2019-04-10 07:28:15

#	User	Length	Language	Date
1	Birk Tjelmeland	227	Haskell	2017-08-05 19:21:21
2	Anton Grensjö	261	Haskell	2015-11-14 22:44:07
3	Sebastian Paaske Tørholm	280	Haskell	2017-01-26 21:37:46
4	Jacob Molin	312	Haskell	2025-01-19 18:01:31
5	Jan Hlavacek	361	Haskell	2016-11-23 21:17:07
6	Jonas Palm	364	Haskell	2015-04-08 17:51:35
7	Emil Raksanyi	375	Haskell	2014-12-04 11:02:58
8	Ben Stokes	378	Haskell	2022-06-17 19:20:52
9	Matthew Johnson	380	Haskell	2018-02-28 07:07:09
10	Daniel Olsson	383	Haskell	2014-12-05 16:18:05

#	User	Length	Language	Date
1	Adam Abdalla	511	Java	2018-11-20 17:22:50
2	Quan Tran	535	Java	2016-10-18 15:26:02
3	Antonio Ramos	546	Java	2017-09-30 20:11:38
4	Yar Zar Htun	559	Java	2015-09-05 09:39:31
5	Kevin Kauffman	559	Java	2021-10-26 17:27:09
6	Quan Chau	566	Java	2017-06-13 20:26:09
7	Alexandros Antonorsi	566	Java	2018-11-20 18:00:32
8	Raymond Arrington	570	Java	2024-06-17 08:35:59
9	Rick May	577	Java	2017-01-05 04:42:39
10	Uncg Demo	580	Java	2014-09-30 01:08:42

#	User	Length	Language	Date
1	Edixon	386	JavaScript (Node.js)	2025-08-29 02:01:31
2	Saleth Ibarra	401	JavaScript (Node.js)	2025-08-29 01:49:38
3	Chris Wong	602	JavaScript (Node.js)	2021-02-21 15:59:58
4	Kevin Ma	632	JavaScript (Node.js)	2020-07-07 15:28:55
5	Howard Tin Chi Chan	748	JavaScript (Node.js)	2021-03-04 20:08:02
6	Richard Alison	1061	JavaScript (Node.js)	2020-10-04 12:59:15
7	Andoko Chandra	1067	JavaScript (Node.js)	2020-10-10 10:21:30
8	Stephanie Keck	2973	JavaScript (Node.js)	2020-01-19 06:17:07

#	User	Length	Language	Date
1	Jimmy Gustafsson	204	JavaScript (SpiderMonkey)	2024-06-17 12:31:43
2	Peter Menyes	346	JavaScript (SpiderMonkey)	2021-08-18 17:18:58
3	Christian Pilegaard Cederquist	346	JavaScript (SpiderMonkey)	2023-01-12 15:33:48
4	Johannes Strelen	399	JavaScript (SpiderMonkey)	2018-12-07 10:31:56
5	Bjørn Chr. Soltvedt	414	JavaScript (SpiderMonkey)	2016-02-19 15:43:53
6	Steven Tang	445	JavaScript (SpiderMonkey)	2019-11-11 01:19:20
7	Peter Kedemo	539	JavaScript (SpiderMonkey)	2015-12-23 00:31:00
8	Andri Andresson	614	JavaScript (SpiderMonkey)	2018-05-11 15:58:27
9	Paul Leung	718	JavaScript (SpiderMonkey)	2017-02-20 12:30:12
10	Alan Delaney	720	JavaScript (SpiderMonkey)	2017-04-20 16:09:24

#	User	Length	Language	Date
1	Noszály Csaba	122	Julia	2025-03-02 22:58:04
2	Danny Robinson	131	Julia	2023-11-23 11:47:17
3	Timothy Gaede	514	Julia	2024-05-01 06:28:21

#	User	Length	Language	Date
1	Troy Warmboe	398	Kotlin	2020-02-11 18:46:20
2	Adam Koprowski	420	Kotlin	2020-11-28 21:10:22
3	Einar Kjellback	433	Kotlin	2019-12-12 08:07:37
4	Hidden user	435	Kotlin	2017-11-23 06:28:08
5	Adam Rankin	451	Kotlin	2023-08-25 19:20:38
6	Dmitry Shostak	457	Kotlin	2018-08-21 07:27:51
7	Sergey Jakobsen	478	Kotlin	2021-06-09 21:24:53
8	Dayan Ruben Gonzalez	491	Kotlin	2020-10-01 05:17:08
9	Danny Mittal	520	Kotlin	2021-02-12 02:22:54
10	Philipp Maksimov	681	Kotlin	2020-04-25 15:30:20

#	User	Length	Language	Date
1	Joel Newman	11073	OCaml	2023-11-23 02:08:10

#	User	Length	Language	Date
1	Khoa Ngo Duc Minh	446	Pascal	2021-10-12 13:46:00
2	Ingemar Ragnemalm	1909	Pascal	2017-08-15 10:02:23

#	User	Length	Language	Date
1	Renate	718	PHP	2023-07-27 00:50:32
2	Andre Wahyudi	871	PHP	2023-03-17 04:29:31

#	User	Length	Language	Date
1	Hakan Kjellerstrand	276	Prolog	2023-02-11 19:39:48
2	Hidden user	627	Prolog	2015-07-29 22:19:33
3	Ezeddin Alhakim	1293	Prolog	2015-03-18 21:11:12
4	Jorge Andres Munoz Caceres	1384	Prolog	2014-12-08 19:08:56
5	Aleksandr Terranova	1466	Prolog	2016-10-01 19:40:33
6	Emma Nimstad	1483	Prolog	2015-10-26 11:33:18
7	Hidden user	1497	Prolog	2016-05-09 09:26:32
8	Hidden user	1595	Prolog	2016-04-08 22:02:00
9	Hidden user	1642	Prolog	2014-12-02 11:10:55
10	Jonas Palm	1644	Prolog	2015-04-08 14:34:47

#	User	Length	Language	Date
1	Hidden user	160	Python 2	2015-02-20 18:04:23
2	Yan Kalchevsky	162	Python 2	2017-01-17 20:06:56
3	Hidden user	170	Python 2	2018-12-26 01:31:00
4	Thomas Feld	178	Python 2	2019-08-19 15:02:09
5	Martin Stensgård	185	Python 2	2014-11-26 03:19:53
6	Jesper Öqvist	212	Python 2	2018-10-24 22:58:58
7	Erik Odenman	219	Python 2	2015-05-10 21:33:08
8	Jeff Robertson	222	Python 2	2017-09-10 03:24:12
9	Lars Åström	229	Python 2	2018-11-02 23:16:50
10	Haggai Liu	231	Python 2	2017-01-27 21:49:48

#	User	Length	Language	Date
1	Jaydan Aladro	106	Python 3	2024-09-05 10:53:59
2	Guillermo Hernández	121	Python 3	2024-01-24 14:49:52
3	Vedran Čačić	126	Python 3	2019-02-20 09:51:45
4	Mattéo Delabre	138	Python 3	2023-10-09 22:04:39
5	Farzam Abrishami	139	Python 3	2024-01-23 21:54:30
6	David Aldenbro	142	Python 3	2025-03-10 23:42:54
7	Brandon Zhang	146	Python 3	2022-05-20 08:49:52
8	Charles Ancheta	146	Python 3	2023-04-09 08:16:47
9	Tai Tze Kin	150	Python 3	2024-05-02 19:07:04
10	Max Dellby	151	Python 3	2024-07-21 14:27:31

#	User	Length	Language	Date
1	Thomas Feld	71	Ruby	2023-02-09 09:22:15
2	Hidden user	312	Ruby	2019-03-04 12:51:24
3	Martin Larsson	330	Ruby	2017-03-04 14:43:12
4	Erik Rydbert	352	Ruby	2016-07-11 05:55:39
5	Patricia Gao	388	Ruby	2020-01-24 10:59:57
6	Alghi Fariansyah	398	Ruby	2020-10-29 18:01:09
7	Hidden user	547	Ruby	2019-11-10 17:55:47
8	Daniel Harder	559	Ruby	2018-09-01 04:00:01
9	Lara Hoya Trujillo	585	Ruby	2019-11-17 18:56:57
10	Yaman Shiekh Deia	606	Ruby	2016-05-15 02:10:33

#	User	Length	Language	Date
1	Vincent Lagerros	480	Rust	2025-01-26 15:55:49
2	Pankajkumar Patro	722	Rust	2024-11-02 17:26:59
3	Chaoyi Yin	762	Rust	2019-01-06 20:23:17
4	David Zacek	776	Rust	2021-06-01 19:48:53
5	Kok Dith	800	Rust	2021-08-14 06:43:07
6	Bas Dirks	868	Rust	2022-01-04 18:25:32
7	David Rasch	903	Rust	2020-07-24 16:40:30
8	Joe Blower	1024	Rust	2025-06-07 02:45:11
9	Þorvaldur Tumi Baldursson	1197	Rust	2023-01-23 22:29:27
10	Valdimar Örn	1265	Rust	2023-01-29 19:18:03

#	User	Length	Language	Date
1	Diego Mauricio Ortiz Sanchez	1327	TypeScript	2025-08-29 01:10:28

Solution running time distribution