Problem A
Skener — Problem Statistics

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Submissions	8868
Accepted submissions	5574
Submission ratio	62.86%
Authors	5223
Full solves [?]	4998
Full solve Ratio	95.69%

#	User	Runtime	Language	Date
1	s-l-s	0.00 s	Ada	2025-02-02 12:53:45

#	User	Runtime	Language	Date
1	Stefan Baumann	0.02 s	APL	2023-05-16 19:00:09
2	Thomas Feld	0.03 s	APL	2023-05-17 10:24:23

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.07 s	Bash	2024-02-04 18:00:51

#	User	Runtime	Language	Date
1	Duelene Olson	0.02 s	C#	2016-08-25 05:11:29
2	Ugnius Skučas	0.02 s	C#	2016-10-06 14:38:20
3	Jonathan Walker	0.02 s	C#	2016-10-18 19:52:06
4	Jay Hal	0.02 s	C#	2017-01-01 23:11:55
5	Jens Mossig	0.02 s	C#	2017-02-12 12:37:24
6	Rasmus Brants	0.02 s	C#	2017-04-27 16:37:16
7	Ólafur Andri	0.02 s	C#	2017-10-11 23:48:15
8	Alex Telon	0.02 s	C#	2017-10-20 23:05:21
9	Faisal Rahman	0.02 s	C#	2017-10-23 02:37:04
10	Rasmus Öjebro	0.02 s	C#	2017-11-08 09:41:09

#	User	Runtime	Language	Date
1	wibi	0.01 s	Common Lisp	2020-09-02 12:37:42
2	Jinwoo Lee	0.01 s	Common Lisp	2020-10-07 04:41:50
3	yraten	0.01 s	Common Lisp	2024-04-22 21:45:33
4	David Cawthon	0.03 s	Common Lisp	2019-04-25 03:36:22
5	Norvell Spearman	0.04 s	Common Lisp	2024-12-21 18:22:11

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.05 s	F#	2022-06-10 17:15:39
2	Stefan Schmiedl	0.17 s	F#	2024-08-26 20:42:17

#	User	Runtime	Language	Date
1	Jimmy Nejtron	0.01 s	Go	2023-09-19 14:16:53
2	Daniel Agatan	0.01 s	Go	2025-02-24 15:53:37
3	Neal McCarthy	0.07 s	Go	2018-10-28 17:02:26
4	Krzysztof Gibuła	0.07 s	Go	2019-01-16 23:56:41
5	Adam Smith	0.08 s	Go	2017-03-02 23:21:11
6	Aurélien Brabant	0.08 s	Go	2020-11-12 17:24:36
7	Norbert Voelker	0.08 s	Go	2021-04-10 00:20:28
8	Wojtek Bednarzak	0.09 s	Go	2018-04-30 16:47:50
9	Ross O'Sullivan	0.14 s	Go	2018-08-18 16:15:24
10	Andriy Zyevakov	0.15 s	Go	2019-04-15 11:26:50

#	User	Runtime	Language	Date
1	Ryan Darius Lim	0.05 s	Java	2024-08-31 07:30:44
2	Hidden user	0.05 s	Java	2024-09-06 18:44:51
3	Poh Ting Yi	0.05 s	Java	2024-09-07 04:20:26
4	Nguyen Hanh Phuong Trang	0.05 s	Java	2024-09-11 06:04:55
5	Brandon Mok	0.05 s	Java	2024-09-12 10:37:10
6	Hidden user	0.05 s	Java	2024-09-22 14:43:25
7	Hidden user	0.05 s	Java	2024-09-24 15:15:16
8	Isaac Soong Hong Wei	0.05 s	Java	2024-10-01 18:27:05
9	Tan Kheng Lin	0.05 s	Java	2025-04-22 10:08:56
10	Peng Rui Biao	0.05 s	Java	2025-09-26 08:13:39

#	User	Runtime	Language	Date
1	Carl Sundvall	0.05 s	JavaScript (Node.js)	2018-10-27 16:31:50
2	Jennifer Su	0.05 s	JavaScript (Node.js)	2024-03-16 11:51:46
3	Hidden user	0.05 s	JavaScript (Node.js)	2024-09-04 19:18:01
4	tannal	0.05 s	JavaScript (Node.js)	2025-06-14 06:51:18
5	José Lucas	0.06 s	JavaScript (Node.js)	2019-03-11 20:10:42
6	Gurpartap Singh Bhatti	0.06 s	JavaScript (Node.js)	2019-03-12 17:43:03
7	Hidden user	0.07 s	JavaScript (Node.js)	2019-06-13 17:21:32
8	Jaime López	0.42 s	JavaScript (Node.js)	2020-02-05 18:11:33
9	Ryan Randhawa	0.42 s	JavaScript (Node.js)	2020-09-09 00:15:45
10	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-03 04:36:47

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2016-04-14 14:23:36
2	J M	0.01 s	JavaScript (SpiderMonkey)	2016-10-28 13:23:15
3	Tor Nordqvist	0.01 s	JavaScript (SpiderMonkey)	2016-11-05 23:00:18
4	Spencer Smith	0.01 s	JavaScript (SpiderMonkey)	2017-06-15 15:27:42
5	Michael Hjortholt	0.01 s	JavaScript (SpiderMonkey)	2017-07-11 13:15:53
6	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-04 20:15:10
7	Davíð Helgason	0.01 s	JavaScript (SpiderMonkey)	2017-08-06 17:50:53
8	Nicklas Utgaard	0.01 s	JavaScript (SpiderMonkey)	2017-12-24 15:59:54
9	Robin Livesey	0.01 s	JavaScript (SpiderMonkey)	2018-04-15 18:43:35
10	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2016-04-14 07:46:31

#	User	Runtime	Language	Date
1	Timothy Gaede	0.62 s	Julia	2024-04-01 04:53:42
2	Danny Robinson	0.65 s	Julia	2023-06-23 23:33:01

#	User	Runtime	Language	Date
1	Albert Pala	0.13 s	Kotlin	2021-07-04 17:34:18
2	Johnny Baloney	0.14 s	Kotlin	2021-12-09 15:10:02
3	Alexandre Conte	0.19 s	Kotlin	2020-09-14 23:47:03
4	Ashish Singh	0.19 s	Kotlin	2023-02-01 10:06:33
5	Dayan Ruben Gonzalez	0.21 s	Kotlin	2020-09-29 17:09:55
6	Patrik Lilja	0.22 s	Kotlin	2018-02-12 22:02:19
7	Dmitry Shostak	0.22 s	Kotlin	2018-08-28 18:42:26
8	Timo Schikhof	0.22 s	Kotlin	2022-04-21 21:54:47
9	Sergey Jakobsen	0.23 s	Kotlin	2021-06-09 17:39:26
10	Adam Rankin	0.23 s	Kotlin	2023-05-04 08:02:37

#	User	Runtime	Language	Date
1	Matthew Farshad	0.00 s	Lua	2025-02-13 19:06:20

#	User	Runtime	Language	Date
1	Erik K	0.00 s	OCaml	2020-10-10 11:32:26
2	Hidden user	0.00 s	OCaml	2024-09-25 21:41:51
3	Ludovic Mignot	0.01 s	OCaml	2020-07-22 16:31:38

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-04-24 18:38:57

#	User	Runtime	Language	Date
1	David Connolly	0.00 s	Pascal	2017-09-04 15:21:31
2	Ingemar Ragnemalm	0.00 s	Pascal	2018-05-18 16:17:34

#	User	Runtime	Language	Date
1	J Sotomayor	0.00 s	Perl	2025-04-14 05:02:03
2	Saito Ta	0.01 s	Perl	2024-03-29 07:34:11

#	User	Runtime	Language	Date
1	Steven D. Wilson	0.01 s	PHP	2016-11-15 09:47:30
2	Helbin Grégory	0.01 s	PHP	2020-09-09 15:18:16
3	Petr Trofimov	0.01 s	PHP	2021-04-20 09:48:48
4	Renate	0.01 s	PHP	2021-06-02 00:37:34
5	Andre Wahyudi	0.01 s	PHP	2022-10-21 11:08:29
6	Jonas Lindenskov Nielsen	0.06 s	PHP	2019-10-14 17:19:06

#	User	Runtime	Language	Date
1	Hadi Qovaizi	0.07 s	Prolog	2016-12-16 13:19:31

#	User	Runtime	Language	Date
1	Christofer Ohlsson	0.03 s	Python 2	2016-04-14 07:22:11
2	Hasan Ramezani	0.03 s	Python 2	2016-07-05 17:46:44
3	Erik Sillén	0.03 s	Python 2	2016-08-07 18:37:56
4	Maksym Bendeberia	0.03 s	Python 2	2016-08-20 16:45:38
5	Frederik Højholt	0.03 s	Python 2	2016-09-10 09:58:34
6	Bernhard Kartefla	0.03 s	Python 2	2016-09-21 11:56:20
7	Victor Barbarosh	0.03 s	Python 2	2016-10-09 03:16:51
8	Siri Dovner	0.03 s	Python 2	2016-10-16 21:01:11
9	Mikael Forsberg	0.03 s	Python 2	2016-10-27 19:34:06
10	Ben Ao	0.03 s	Python 2	2016-11-11 16:08:31

#	User	Runtime	Language	Date
1	Robert Welin-Berger	0.02 s	Python 3	2016-04-13 18:28:18
2	Peter Deal	0.02 s	Python 3	2016-07-02 21:24:51
3	Nathan Collins	0.02 s	Python 3	2016-08-02 22:51:42
4	Shane Grogan	0.02 s	Python 3	2016-08-09 19:41:54
5	Ziyad Mourabiti	0.02 s	Python 3	2016-08-15 12:52:00
6	Davi Ajmaya	0.02 s	Python 3	2016-08-21 17:36:31
7	Dalton Cole	0.02 s	Python 3	2016-09-04 06:25:28
8	Wayne	0.02 s	Python 3	2016-09-08 14:48:18
9	Fredrik Bondza	0.02 s	Python 3	2016-09-09 22:48:40
10	Christian Lindeström	0.02 s	Python 3	2016-09-11 20:33:36

#	User	Runtime	Language	Date
1	Paul Vinell	0.03 s	Ruby	2018-04-02 12:38:42
2	Casper Christensen	0.05 s	Ruby	2016-07-04 16:19:17
3	Erik Rydbert	0.05 s	Ruby	2016-07-26 15:25:00
4	Daniel Harder	0.05 s	Ruby	2018-10-29 01:47:50
5	Kellen Watt	0.05 s	Ruby	2018-11-18 07:18:15
6	Hidden user	0.05 s	Ruby	2019-02-16 17:31:50
7	Macdara mac an tSionnaigh	0.05 s	Ruby	2019-09-30 00:22:42
8	Kenneth Runnman	0.05 s	Ruby	2020-02-03 15:48:31
9	Thomas Feld	0.06 s	Ruby	2022-11-08 12:06:36
10	Alexander Bilde Pedersen	0.06 s	Ruby	2023-05-14 23:51:42

#	User	Length	Language	Date
1	s-l-s	1609	Ada	2025-02-02 12:53:45

#	User	Length	Language	Date
1	Thomas Feld	42	APL	2023-05-17 10:24:23
2	Stefan Baumann	54	APL	2023-05-16 19:00:09

#	User	Length	Language	Date
1	Chenzhang Hu	52	Bash	2025-09-13 04:44:18

#	User	Length	Language	Date
1	Martin Blom	181	C	2023-10-17 08:49:23
2	Zachariah Goldthorpe	187	C	2018-06-04 00:28:32
3	Anthony Clark	300	C	2017-03-26 22:44:03
4	Raymond Yang	313	C	2018-07-04 10:58:33
5	Bernard Bryan Hayashi	322	C	2020-09-09 16:28:24
6	Finn Uddling	337	C	2025-10-06 16:37:58
7	Anton Haglund	350	C	2016-11-18 16:56:06
8	Drake Packard	353	C	2018-03-09 16:16:28
9	Wesley Stephanak	354	C	2019-02-04 22:52:17
10	Srikar Ganesh	360	C	2019-03-11 19:29:01

#	User	Length	Language	Date
1	Kunwei Zhang	489	C#	2018-02-04 10:20:53
2	李陆屿	502	C#	2018-12-26 16:55:11
3	Esty Crow	517	C#	2023-10-28 07:39:27
4	Pontus Magnusson	548	C#	2024-03-29 01:19:01
5	Shaun Lazaro	557	C#	2016-11-26 23:47:10
6	Robert Low	581	C#	2016-07-16 11:38:18
7	Գոռ Բաղդասարյան	587	C#	2024-08-20 12:42:59
8	Fernanda Ferrer Ortega	593	C#	2023-05-05 18:42:33
9	PlagueX	595	C#	2024-03-01 21:04:18
10	Lucía María Alvarez Sánchez	600	C#	2023-05-24 21:32:29

#	User	Length	Language	Date
1	Tommy Phillips	243	C++	2024-04-02 23:30:57
2	Budi Arbenta	257	C++	2017-01-26 15:08:18
3	Way Tan	267	C++	2018-11-27 08:55:37
4	Adrien	269	C++	2024-03-19 23:59:02
5	Chen Zhe	272	C++	2020-04-09 15:24:24
6	Hrant Hovhannisyan	277	C++	2017-03-18 12:10:46
7	Antonio Molina Lovett	278	C++	2016-08-06 01:05:00
8	Mugeon Kim	283	C++	2024-02-14 03:36:35
9	tarflah	287	C++	2016-11-22 21:32:16
10	Đậu Huy Minh	289	C++	2022-10-11 02:47:07

#	User	Length	Language	Date
1	yraten	446	Common Lisp	2024-04-22 21:45:33
2	Jinwoo Lee	452	Common Lisp	2020-10-07 04:41:50
3	David Cawthon	467	Common Lisp	2019-04-25 03:36:22
4	wibi	681	Common Lisp	2020-09-02 12:37:42
5	Norvell Spearman	953	Common Lisp	2024-12-21 18:22:11

#	User	Length	Language	Date
1	Stefan Schmiedl	313	F#	2024-08-26 20:42:17
2	Jacob Harris Cryer Kragh	1054	F#	2022-06-10 17:15:39

#	User	Length	Language	Date
1	Nimrod Yonatan Ben-Nes	391	Go	2020-07-06 11:25:18
2	Ian Howell	467	Go	2017-01-25 05:31:01
3	Aurélien Brabant	470	Go	2020-11-12 17:13:28
4	Jimmy Nejtron	539	Go	2023-09-19 14:16:53
5	Adam Smith	594	Go	2017-03-02 23:21:11
6	Andriy Zyevakov	618	Go	2019-04-15 11:26:50
7	Daniel Agatan	632	Go	2025-02-24 15:53:37
8	Krzysztof Gibuła	667	Go	2019-01-16 23:56:41
9	Neal McCarthy	721	Go	2018-10-28 17:02:26
10	Wojtek Bednarzak	723	Go	2018-04-30 16:47:50

#	User	Length	Language	Date
1	Juan Miguel Vilar	87	Haskell	2025-09-12 11:22:21
2	Rudy Matela	133	Haskell	2024-03-25 19:24:58
3	Li Jun	183	Haskell	2023-07-04 18:04:32
4	Erik Hesselink	191	Haskell	2020-02-20 13:58:37
5	Hidden user	222	Haskell	2020-09-01 08:50:45
6	Frederik Hanghøj Iversen	224	Haskell	2021-10-04 11:29:27
7	Carl Agrell	248	Haskell	2016-09-29 08:29:46
8	Andrew Mark Allen	260	Haskell	2017-03-02 00:55:32
9	Christopher Whelan	267	Haskell	2025-01-20 19:02:48
10	Frederik Haagensen	278	Haskell	2021-07-15 20:24:37

#	User	Length	Language	Date
1	daffa fathani adila	460	Java	2021-02-04 02:57:21
2	Bruno Martinovic	461	Java	2020-11-20 01:37:10
3	Martin Holst	485	Java	2018-10-01 11:04:15
4	Qritel Abdelilah	490	Java	2017-04-24 04:08:47
5	Angel Clarita Juspi	491	Java	2021-02-03 19:51:44
6	Poh Yu Jie	494	Java	2021-02-02 11:45:18
7	Wang Xiaohan	508	Java	2021-01-31 17:21:30
8	Veer Mehta	509	Java	2025-08-25 03:45:17
9	Hidden user	510	Java	2017-03-17 18:43:05
10	Otto Alexander Sutianto	510	Java	2019-08-26 08:47:03

#	User	Length	Language	Date
1	Gurpartap Singh Bhatti	578	JavaScript (Node.js)	2019-03-12 17:43:03
2	José Lucas	602	JavaScript (Node.js)	2019-03-11 20:10:42
3	Ryan Randhawa	684	JavaScript (Node.js)	2020-09-09 01:07:14
4	Toa Pita	703	JavaScript (Node.js)	2022-05-20 03:38:31
5	Łukasz Ptak	783	JavaScript (Node.js)	2020-02-27 22:24:49
6	Hidden user	805	JavaScript (Node.js)	2023-08-06 22:30:45
7	Jaime López	849	JavaScript (Node.js)	2020-02-05 18:30:35
8	Antoine Bauri	851	JavaScript (Node.js)	2021-02-14 14:12:28
9	Andoko Chandra	894	JavaScript (Node.js)	2020-10-03 04:36:47
10	Jennifer Su	917	JavaScript (Node.js)	2024-03-16 11:51:46

#	User	Length	Language	Date
1	Jimmy Gustafsson	148	JavaScript (SpiderMonkey)	2024-06-10 08:32:12
2	Ben Armstrong	209	JavaScript (SpiderMonkey)	2025-08-20 04:57:04
3	Bernard Perrin	240	JavaScript (SpiderMonkey)	2019-01-20 15:51:23
4	Evan Magill	275	JavaScript (SpiderMonkey)	2024-04-08 06:07:10
5	Christian Pilegaard Cederquist	327	JavaScript (SpiderMonkey)	2022-11-10 23:20:18
6	Robin Livesey	358	JavaScript (SpiderMonkey)	2018-04-15 18:43:35
7	Nicholas Russell Saerang	368	JavaScript (SpiderMonkey)	2021-01-29 19:47:46
8	Peter Kedemo	404	JavaScript (SpiderMonkey)	2016-04-14 14:23:36
9	Peter Menyes	435	JavaScript (SpiderMonkey)	2017-08-04 20:15:10
10	Tor Nordqvist	449	JavaScript (SpiderMonkey)	2016-11-05 23:00:18

#	User	Length	Language	Date
1	Danny Robinson	92	Julia	2023-06-23 23:33:01
2	Timothy Gaede	1358	Julia	2024-04-01 04:53:42

#	User	Length	Language	Date
1	Magnus Wass	267	Kotlin	2020-03-06 00:41:57
2	Kelly Dance	287	Kotlin	2022-09-17 22:38:07
3	Jahid Hasan Imon	305	Kotlin	2020-05-10 11:55:07
4	Adam Rankin	329	Kotlin	2023-05-04 08:02:37
5	Hidden user	335	Kotlin	2019-11-25 20:47:28
6	Sergey Jakobsen	361	Kotlin	2021-06-09 17:39:26
7	axl	367	Kotlin	2019-08-05 12:57:42
8	Ashish Singh	371	Kotlin	2023-02-01 10:06:33
9	Dmitry Shostak	381	Kotlin	2018-08-28 18:42:26
10	Alexandre Conte	514	Kotlin	2020-09-14 23:47:03

#	User	Length	Language	Date
1	Matthew Farshad	436	Lua	2025-02-13 19:06:20

#	User	Length	Language	Date
1	Hidden user	406	OCaml	2024-09-25 21:41:51
2	Ludovic Mignot	694	OCaml	2020-07-22 16:31:38
3	Erik K	741	OCaml	2020-10-10 11:32:26

#	User	Length	Language	Date
1	Hidden user	639	Odin	2025-04-24 18:38:57

#	User	Length	Language	Date
1	Ingemar Ragnemalm	420	Pascal	2018-05-18 16:17:34
2	David Connolly	1189	Pascal	2017-09-04 15:21:31

#	User	Length	Language	Date
1	Saito Ta	69	Perl	2024-03-29 07:34:11
2	J Sotomayor	219	Perl	2025-04-14 05:02:03

#	User	Length	Language	Date
1	Steven D. Wilson	345	PHP	2016-11-15 09:47:30
2	Jonas Lindenskov Nielsen	421	PHP	2019-10-14 17:19:06
3	Petr Trofimov	431	PHP	2021-04-20 09:48:48
4	Renate	534	PHP	2021-06-02 00:37:34
5	Andre Wahyudi	834	PHP	2022-10-21 11:08:29
6	Helbin Grégory	998	PHP	2020-09-09 15:18:16

#	User	Length	Language	Date
1	Hadi Qovaizi	6680	Prolog	2016-12-16 13:19:31

#	User	Length	Language	Date
1	Thomas Feld	129	Python 2	2019-08-20 16:56:05
2	Johan Wind	149	Python 2	2017-04-20 18:40:35
3	Hubert Teo	154	Python 2	2017-02-17 02:00:40
4	Felix Albrigtsen	155	Python 2	2019-01-06 23:39:05
5	Matteo Piano	175	Python 2	2016-12-19 21:32:25
6	Jeff Robertson	180	Python 2	2017-04-30 03:11:13
7	Andreas Eisele	182	Python 2	2018-10-04 08:41:41
8	Johan Lyts	194	Python 2	2019-06-11 15:25:09
9	Miguel Alfageme Sanchez	196	Python 2	2017-02-03 22:44:24
10	Mathis Hammel	198	Python 2	2017-01-24 01:58:43

#	User	Length	Language	Date
1	Alexandre Charland	101	Python 3	2024-03-19 02:07:49
2	Charles Ancheta	104	Python 3	2023-03-28 05:38:33
3	Nino Bašić	105	Python 3	2024-08-26 20:53:19
4	Harry Zhang	108	Python 3	2022-11-21 10:39:30
5	Tai Tze Kin	116	Python 3	2024-05-01 09:42:24
6	John Hershey	121	Python 3	2025-02-04 01:03:43
7	Hidden user	124	Python 3	2025-01-20 12:24:35
8	Vedran Čačić	126	Python 3	2019-01-11 09:10:51
9	Theo Coyne Morgan	130	Python 3	2018-10-21 19:13:14
10	benoit belasco	131	Python 3	2023-07-24 15:03:19

#	User	Length	Language	Date
1	Thomas Feld	63	Ruby	2022-11-08 12:06:36
2	Russell Ng	90	Ruby	2024-08-30 22:11:45
3	Daniel Harder	132	Ruby	2018-10-29 01:47:50
4	Hidden user	142	Ruby	2019-02-16 17:31:50
5	Chenzhang Hu	147	Ruby	2025-09-22 19:04:48
6	Kellen Watt	148	Ruby	2018-11-18 07:18:15
7	Alexander Bilde Pedersen	193	Ruby	2023-05-14 23:51:42
8	Macdara mac an tSionnaigh	249	Ruby	2019-09-30 00:22:42
9	Erik Rydbert	253	Ruby	2016-07-26 15:25:00
10	Casper Christensen	324	Ruby	2016-07-04 16:19:17

#	User	Length	Language	Date
1	Emil Dichmann	516	Rust	2025-08-20 21:51:19
2	Vincent Lagerros	523	Rust	2024-10-10 10:37:19
3	Bas Dirks	608	Rust	2022-01-02 11:21:49
4	David Zacek	618	Rust	2021-05-21 03:39:05
5	Chaoyi Yin	656	Rust	2019-03-20 21:27:28
6	Franz Miltz	660	Rust	2019-11-30 02:11:03
7	Thomas	661	Rust	2023-06-02 22:37:15
8	Andriy Semenistiy	675	Rust	2021-02-15 22:00:36
9	Hidden user	677	Rust	2023-04-29 21:13:03
10	Aza Maulana Hadi	689	Rust	2024-03-16 13:46:12

Solution running time distribution