Problem A
4 thought — Problem Statistics

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Submissions	23717
Accepted submissions	7438
Submission ratio	31.36%
Authors	6988
Full solves [?]	5760
Full solve Ratio	82.43%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.03 s	Bash	2024-02-03 06:41:01

#	User	Runtime	Language	Date
1	Joe Amenta	0.04 s	C#	2016-04-09 17:45:43
2	Tristan Close	0.04 s	C#	2017-03-14 20:51:05
3	Mikael Fiala-Lundström	0.04 s	C#	2018-01-27 15:56:49
4	Thomas Norris	0.04 s	C#	2019-06-24 21:58:39
5	Rasmus Leyes	0.04 s	C#	2019-11-18 10:43:54
6	ratla	0.04 s	C#	2022-01-17 19:24:48
7	Esty Crow	0.04 s	C#	2025-08-08 18:31:01
8	Ruslan godiksen	0.04 s	C#	2025-11-20 07:21:19
9	Daouda Camara	0.05 s	C#	2015-09-17 10:38:37
10	Håkan Sjöström	0.05 s	C#	2015-10-27 08:25:38

#	User	Runtime	Language	Date
1	David Cawthon	0.03 s	Common Lisp	2019-04-12 16:03:49

#	User	Runtime	Language	Date
1	dick move	0.00 s	Crystal	2025-09-27 15:04:24

#	User	Runtime	Language	Date
1	Fustiki Scuria	0.01 s	D	2024-05-26 05:51:50

#	User	Runtime	Language	Date
1	Kalle Johansson	0.01 s	Dart	2023-06-29 08:29:09

#	User	Runtime	Language	Date
1	Hidden user	0.09 s	F#	2022-07-21 02:59:22
2	Elias Illeris Poggi	0.09 s	F#	2025-02-28 10:03:49
3	Simon Egeberg Svarre	0.09 s	F#	2025-09-23 10:48:25
4	Jacob Harris Cryer Kragh	0.12 s	F#	2023-06-10 12:53:13
5	Magnus Baasch Langkilde	0.12 s	F#	2025-03-05 13:19:09

#	User	Runtime	Language	Date
1	Jesper Larsson	0.04 s	Java	2015-09-28 18:20:49
2	Michael Sullivan	0.04 s	Java	2015-10-13 00:49:49
3	Marius de Vogel	0.04 s	Java	2016-04-02 21:56:52
4	Jonathan Marino	0.04 s	Java	2016-04-25 18:21:57
5	Joachim Nybo	0.04 s	Java	2016-09-16 22:16:58
6	Samuel Klingström	0.04 s	Java	2017-05-05 10:33:55
7	Martin Wiberg Petersen	0.04 s	Java	2017-07-11 20:45:02
8	Liam Keliher	0.04 s	Java	2019-01-29 13:52:30
9	Willem Greenwood	0.04 s	Java	2019-03-09 03:30:10
10	Huang Weijie	0.04 s	Java	2019-04-18 13:17:38

#	User	Runtime	Language	Date
1	Chris Wong	0.04 s	JavaScript (Node.js)	2021-02-28 22:54:20
2	davidperjac	0.04 s	JavaScript (Node.js)	2025-05-17 14:55:41
3	Baptiste Keunebroek	0.04 s	JavaScript (Node.js)	2025-08-23 09:50:19
4	Hidden user	0.04 s	JavaScript (Node.js)	2025-08-23 10:35:31
5	Marc Fong	0.05 s	JavaScript (Node.js)	2021-05-17 11:51:38
6	Samuel Högfeldt	0.05 s	JavaScript (Node.js)	2022-06-18 19:34:07
7	Hidden user	0.05 s	JavaScript (Node.js)	2024-06-11 21:06:55
8	Nicolas Bessoles	0.05 s	JavaScript (Node.js)	2025-09-04 15:28:49
9	Ihor Kolisnyk	0.05 s	JavaScript (Node.js)	2025-10-07 07:03:34
10	Marius Alexander Winsjansen	0.06 s	JavaScript (Node.js)	2020-07-29 01:28:15

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2016-01-01 14:45:37
2	Gabriel Lau	0.02 s	JavaScript (SpiderMonkey)	2016-03-23 20:02:35
3	Peter Kedemo	0.02 s	JavaScript (SpiderMonkey)	2016-09-21 18:17:47
4	Christian LaCourt	0.02 s	JavaScript (SpiderMonkey)	2016-10-18 22:08:12
5	Tor Nordqvist	0.02 s	JavaScript (SpiderMonkey)	2016-10-31 15:27:56
6	Anton Lundqvist	0.02 s	JavaScript (SpiderMonkey)	2017-05-25 17:02:05
7	David Trång	0.02 s	JavaScript (SpiderMonkey)	2017-05-27 20:33:07
8	Jonas Celander Guss	0.02 s	JavaScript (SpiderMonkey)	2017-06-16 17:03:59
9	Paul Leung	0.02 s	JavaScript (SpiderMonkey)	2017-08-29 15:46:00
10	Andrea Bianchessi	0.02 s	JavaScript (SpiderMonkey)	2017-10-19 20:37:11

#	User	Runtime	Language	Date
1	Timothy Gaede	0.48 s	Julia	2024-05-01 01:46:28
2	Hidden user	0.51 s	Julia	2025-04-16 16:11:11

#	User	Runtime	Language	Date
1	Dominic Blaich	0.21 s	Kotlin	2019-08-14 12:59:52
2	Mohsen Dehbashi	0.21 s	Kotlin	2019-11-02 08:18:08
3	Emil Saric	0.22 s	Kotlin	2017-11-10 10:23:35
4	Mohamadhassan Ebrahimi	0.22 s	Kotlin	2019-10-31 22:13:47
5	Allen Guan	0.22 s	Kotlin	2022-04-01 12:29:02
6	Sam Keyser	0.22 s	Kotlin	2023-05-17 15:06:35
7	Jacob Huebner	0.23 s	Kotlin	2020-02-28 05:01:56
8	Min-Zheng Shieh	0.23 s	Kotlin	2021-04-09 07:14:42
9	Nicholas Johnson	0.23 s	Kotlin	2021-07-05 23:11:22
10	Dmitry Shostak	0.24 s	Kotlin	2018-08-23 06:42:45

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.00 s	Lua	2023-11-13 23:53:05

#	User	Runtime	Language	Date
1	Samuel Jefferis	0.00 s	OCaml	2020-11-01 15:04:29

#	User	Runtime	Language	Date
1	Yashdeep Singh	0.01 s	Odin	2024-11-11 07:18:35

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-06-21 11:59:37
2	David Connolly	0.04 s	Pascal	2019-01-23 15:00:30

#	User	Runtime	Language	Date
1	Susanne Ragnemalm	0.01 s	PHP	2018-04-01 11:22:21
2	Temirbek	0.01 s	PHP	2022-04-05 13:05:49
3	Victor Santos	0.03 s	PHP	2024-08-23 17:43:06
4	Mohammed Yousif	0.04 s	PHP	2018-04-26 17:08:52

#	User	Runtime	Language	Date
1	Thanh Do Quang	0.07 s	Python 2	2015-09-11 11:04:30
2	Lars Tveito	0.07 s	Python 2	2015-09-18 00:03:50
3	Robin Curbelo	0.07 s	Python 2	2015-09-28 22:40:20
4	Fredrika Agestam	0.07 s	Python 2	2015-10-04 16:15:35
5	Fredrik Nordin	0.07 s	Python 2	2015-10-08 16:37:21
6	Arne Tobias Malkenes Ødegaard	0.07 s	Python 2	2015-12-01 17:56:19
7	Neal Zane	0.07 s	Python 2	2015-12-08 02:06:42
8	Ethan Arnold	0.07 s	Python 2	2015-12-18 22:20:44
9	Hidden user	0.07 s	Python 2	2015-12-20 06:44:47
10	Marcus Johansson	0.07 s	Python 2	2016-08-11 21:46:02

#	User	Runtime	Language	Date
1	Kadriye Yildiz	0.04 s	Python 3	2024-08-28 13:58:53
2	Hidden user	0.04 s	Python 3	2024-09-01 12:47:44
3	Magnus J Moldekleiv	0.04 s	Python 3	2024-09-01 18:21:19
4	Einar Aleksander Arnes	0.04 s	Python 3	2024-09-01 18:31:20
5	Oliver Adser	0.04 s	Python 3	2024-09-01 22:05:16
6	Perry Weller (student)	0.04 s	Python 3	2024-09-04 23:43:49
7	Joshua Dinh	0.04 s	Python 3	2024-09-07 00:28:27
8	Pablo Achá	0.04 s	Python 3	2024-09-09 04:06:10
9	Sander Oppen	0.04 s	Python 3	2024-09-09 17:18:07
10	cera	0.04 s	Python 3	2024-09-10 04:18:45

#	User	Runtime	Language	Date
1	Casper Christensen	0.07 s	Ruby	2016-01-10 22:24:25
2	Hidden user	0.07 s	Ruby	2017-10-23 10:50:24
3	Hidden user	0.07 s	Ruby	2018-10-10 14:29:57
4	Lim Ming Yean	0.07 s	Ruby	2018-12-08 08:40:20
5	Mark Donald Amobi	0.07 s	Ruby	2019-02-13 03:30:01
6	Adam Hellberg	0.07 s	Ruby	2019-09-30 20:33:21
7	John Rabaey	0.07 s	Ruby	2020-04-10 15:52:43
8	Alexander Bilde Pedersen	0.07 s	Ruby	2023-04-08 20:23:15
9	Clement Oh	0.07 s	Ruby	2023-10-31 11:51:02
10	Chris Johnson	0.07 s	Ruby	2024-09-06 20:39:15

#	User	Runtime	Language	Date
1	Aleksandr Toropov	0.00 s	Swift	2025-09-05 12:32:09

#	User	Runtime	Language	Date
1	Sean Kenny	0.08 s	TypeScript	2025-12-24 21:23:04

#	User	Runtime	Language	Date
1	Joe Blower	0.00 s	Zig	2025-05-28 16:23:24
2	Luka Toplak	0.00 s	Zig	2025-06-07 21:30:34

#	User	Length	Language	Date
1	Chenzhang Hu	931	Bash	2024-02-03 06:41:01

#	User	Length	Language	Date
1	Mattias Andrée	759	C	2018-04-29 20:30:12
2	Tjandra Satria Gunawan	1102	C	2015-09-11 11:10:29
3	Gavin Pascual	1217	C	2025-11-12 02:53:09
4	Martin Fornhem	1247	C	2026-02-21 02:26:16
5	Christian Mortensen	1283	C	2018-02-25 14:50:17
6	Axel Lindeberg	1312	C	2018-12-30 09:46:48
7	Axel Lindeberg	1312	C	2018-12-30 13:37:50
8	Hidden user	1405	C	2017-07-17 14:03:48
9	Ravi Shankar Reddy Kanakaveeti	1413	C	2015-09-21 13:57:41
10	Riccardo Sven Risuleo	1457	C	2017-07-21 20:15:31

#	User	Length	Language	Date
1	Sabba Ifzal	827	C#	2023-06-21 18:52:51
2	Jacob Carlsson	1037	C#	2022-02-22 18:32:09
3	Ali Aliev	1114	C#	2024-08-09 12:23:28
4	Amit Vajrashetti	1120	C#	2025-05-26 18:51:08
5	Esty Crow	1159	C#	2025-08-08 18:31:01
6	Tristan Close	1247	C#	2017-03-14 20:51:05
7	Nicholas Johansan	1267	C#	2023-05-26 16:27:12
8	Rasmus Leyes	1273	C#	2019-11-18 10:34:54
9	Daniel Olsson	1365	C#	2019-10-25 08:11:56
10	Skjold Rammer Novak	1429	C#	2023-09-06 10:29:55

#	User	Length	Language	Date
1	traxex	596	C++	2021-12-05 23:01:45
2	José Ramón Morera	634	C++	2025-10-25 11:20:27
3	Hyunjun Lee	703	C++	2022-11-22 12:44:46
4	Hoàng Bá Tuân	706	C++	2018-04-16 16:18:09
5	Hidden user	729	C++	2022-04-14 13:55:18
6	Yeung Man Tsung	735	C++	2022-12-30 13:48:52
7	Ahmed Chamseddine	763	C++	2022-11-18 15:26:47
8	HuangWenYuan	783	C++	2024-10-01 21:00:47
9	Ar Ma	787	C++	2019-04-25 07:01:51
10	Herman Karlsson	822	C++	2015-09-10 17:59:24

#	User	Length	Language	Date
1	David Cawthon	2393	Common Lisp	2019-04-12 16:03:49

#	User	Length	Language	Date
1	dick move	1214	Crystal	2025-09-27 15:04:24

#	User	Length	Language	Date
1	Fustiki Scuria	3664	D	2024-05-26 05:51:50

#	User	Length	Language	Date
1	Kalle Johansson	943	Dart	2023-06-29 08:29:09

#	User	Length	Language	Date
1	Magnus Baasch Langkilde	789	F#	2025-03-05 13:19:09
2	Hidden user	2018	F#	2022-07-21 10:09:55
3	Simon Egeberg Svarre	2413	F#	2025-09-23 10:48:25
4	Jacob Harris Cryer Kragh	2742	F#	2023-06-10 12:53:13
5	Elias Illeris Poggi	4748	F#	2025-02-28 10:03:49

#	User	Length	Language	Date
1	ffsx	875	Go	2025-10-10 03:45:50
2	Christopher Fjellström	930	Go	2016-10-08 00:45:25
3	Jesper Bech Christensen	1133	Go	2022-03-08 12:13:44
4	Christoffer Danborg Irvall	1333	Go	2019-04-21 20:31:11
5	My Name	1483	Go	2018-11-06 13:07:46
6	Marcus Henrik Simonsen	1887	Go	2022-10-30 19:06:50
7	Scott Dauer	1910	Go	2020-07-07 17:35:21
8	Norbert Voelker	2371	Go	2021-03-30 23:13:35
9	Lars Pensjö	2834	Go	2023-08-30 15:56:04
10	Iker Lissarrague	3260	Go	2022-03-06 19:39:57

#	User	Length	Language	Date
1	Aaron Allen	828	Haskell	2021-06-16 04:44:46
2	Hidden user	869	Haskell	2021-11-18 15:14:28
3	Abel Martin	940	Haskell	2018-11-18 19:27:44
4	Esther Chong	957	Haskell	2017-12-11 08:34:48
5	Fabian Mitterwallner	959	Haskell	2025-07-31 12:36:13
6	Tobias Bengtsson	975	Haskell	2018-11-13 15:24:33
7	Zach Tschetter	981	Haskell	2021-01-23 20:48:45
8	Abdul Haliq	1009	Haskell	2018-05-28 12:44:58
9	Andrés Marzal Varó	1020	Haskell	2020-09-29 15:55:23
10	Justyn Oh	1040	Haskell	2019-07-02 22:20:21

#	User	Length	Language	Date
1	Henry Morco	1023	Java	2016-05-28 13:51:13
2	David Gawel	1043	Java	2020-09-14 06:03:32
3	Markus Bao	1109	Java	2023-10-02 19:15:48
4	Marco Vincenzo Karaan	1119	Java	2015-10-03 06:25:25
5	Edward Flores	1142	Java	2019-09-20 16:24:43
6	Abhijit Singh	1144	Java	2017-04-08 16:44:43
7	Thomas Anung Basuki	1146	Java	2025-06-24 04:17:37
8	Zimu Qin	1149	Java	2015-09-19 14:40:15
9	Robert Nix	1207	Java	2017-09-13 17:50:03
10	Ann Chapple	1207	Java	2019-10-09 23:13:53

#	User	Length	Language	Date
1	Marius Alexander Winsjansen	943	JavaScript (Node.js)	2020-07-29 01:39:35
2	Jesper Svendgaard Åhman Hansen	1054	JavaScript (Node.js)	2020-07-29 01:35:19
3	Ihor Kolisnyk	1055	JavaScript (Node.js)	2025-10-07 07:03:34
4	davidperjac	1276	JavaScript (Node.js)	2025-05-17 14:55:41
5	Hidden user	1358	JavaScript (Node.js)	2025-08-23 10:35:31
6	Hidden user	1480	JavaScript (Node.js)	2024-06-11 21:11:07
7	Simon Ekizean	1609	JavaScript (Node.js)	2021-01-19 20:44:37
8	Samuel Högfeldt	1715	JavaScript (Node.js)	2022-06-18 19:34:07
9	Baptiste Keunebroek	1722	JavaScript (Node.js)	2025-08-23 09:50:50
10	Nicolas Bessoles	1815	JavaScript (Node.js)	2025-09-04 15:28:49

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	468	JavaScript (SpiderMonkey)	2023-02-19 07:53:02
2	Nguyễn Đại Dương	515	JavaScript (SpiderMonkey)	2018-08-06 04:36:05
3	Nguyễn Hùng Cường	577	JavaScript (SpiderMonkey)	2018-08-06 03:38:33
4	Bjørn Chr. Soltvedt	600	JavaScript (SpiderMonkey)	2016-01-01 14:45:37
5	Anton Lundqvist	602	JavaScript (SpiderMonkey)	2017-05-25 17:09:59
6	Knut Salomonsson	652	JavaScript (SpiderMonkey)	2016-11-10 17:53:30
7	Christian LaCourt	744	JavaScript (SpiderMonkey)	2016-10-18 22:08:12
8	Tor Nordqvist	773	JavaScript (SpiderMonkey)	2016-10-31 15:27:56
9	Paul Leung	869	JavaScript (SpiderMonkey)	2017-08-29 15:46:00
10	Peter Kedemo	897	JavaScript (SpiderMonkey)	2016-09-21 18:17:47

#	User	Length	Language	Date
1	Hidden user	462	Julia	2025-04-16 16:11:11
2	Timothy Gaede	970	Julia	2024-05-01 01:46:28

#	User	Length	Language	Date
1	Mohsen Dehbashi	771	Kotlin	2019-11-02 08:18:08
2	Min-Zheng Shieh	948	Kotlin	2021-04-09 07:14:42
3	Mohamadhassan Ebrahimi	978	Kotlin	2019-10-31 22:13:47
4	Allen Guan	1442	Kotlin	2022-04-01 12:29:02
5	Dmitry Shostak	1579	Kotlin	2018-08-23 06:42:45
6	Emil Saric	1756	Kotlin	2017-11-10 10:23:35
7	Sam Keyser	1808	Kotlin	2023-01-24 15:21:10
8	Isaac Owomugisha	1865	Kotlin	2020-09-03 13:54:39
9	Jacob Huebner	2247	Kotlin	2020-02-28 05:01:56
10	Hidden user	2498	Kotlin	2017-11-24 07:42:07

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	826	Lua	2023-11-13 23:53:05

#	User	Length	Language	Date
1	Samuel Jefferis	1494	OCaml	2020-11-01 15:04:29

#	User	Length	Language	Date
1	Yashdeep Singh	3184	Odin	2024-11-11 07:18:35

#	User	Length	Language	Date
1	Ingemar Ragnemalm	3455	Pascal	2018-06-21 11:59:37
2	David Connolly	6856	Pascal	2019-01-23 15:00:30

#	User	Length	Language	Date
1	Temirbek	616	PHP	2022-04-05 13:05:49
2	Victor Santos	1489	PHP	2024-08-23 18:02:03
3	Mohammed Yousif	1490	PHP	2018-04-26 17:08:52
4	Susanne Ragnemalm	2107	PHP	2018-04-01 11:22:21

#	User	Length	Language	Date
1	Thomas Feld	200	Python 2	2019-08-19 12:23:37
2	Johan Wieslander	220	Python 2	2016-12-13 14:13:32
3	Martin Wan	228	Python 2	2018-01-23 02:50:10
4	Andreas Eisele	231	Python 2	2018-09-04 12:36:33
5	Antonio Molina Lovett	236	Python 2	2016-08-15 08:40:47
6	Duncan Page	255	Python 2	2017-11-09 22:03:34
7	Dmitry Lyubshin	279	Python 2	2018-04-03 21:56:10
8	Neal Zane	281	Python 2	2015-12-08 02:06:42
9	Hidden user	302	Python 2	2018-03-02 21:14:49
10	Luke Witt	302	Python 2	2018-03-23 15:14:31

#	User	Length	Language	Date
1	Kevin Gomez	157	Python 3	2023-08-28 05:38:09
2	Marcel Rød	174	Python 3	2025-08-26 05:57:19
3	Simon Hellsten	178	Python 3	2023-07-12 16:43:40
4	Hidden user	184	Python 3	2021-02-02 20:02:05
5	Gustav Kalander	184	Python 3	2021-02-02 20:03:04
6	Daniel Bogorad	193	Python 3	2025-09-17 02:15:03
7	Jens Kollberg	195	Python 3	2021-02-03 20:53:21
8	Vincent Lagerros	204	Python 3	2024-04-20 23:35:16
9	Farzam Abrishami	205	Python 3	2024-01-28 01:06:17
10	Błażej Dariusz Roszkowski	207	Python 3	2022-11-23 18:28:40

#	User	Length	Language	Date
1	Thomas Feld	115	Ruby	2023-05-04 12:51:36
2	Alexander Bilde Pedersen	181	Ruby	2023-04-08 20:23:15
3	Clement Oh	200	Ruby	2023-10-31 11:51:02
4	Mark Donald Amobi	241	Ruby	2019-02-13 03:30:01
5	Daniel Harder	251	Ruby	2018-10-09 16:53:32
6	Hidden user	324	Ruby	2018-10-10 14:33:02
7	Hidden user	330	Ruby	2017-10-23 10:50:24
8	Casper Christensen	338	Ruby	2016-01-10 22:24:25
9	Lim Ming Yean	364	Ruby	2018-12-08 08:40:20
10	Chris Vilches	402	Ruby	2021-10-31 10:27:58

#	User	Length	Language	Date
1	Vincent Lagerros	1146	Rust	2025-07-16 13:13:57
2	Arturas Aleksandraus	1266	Rust	2024-01-25 08:31:49
3	Bas Dirks	1364	Rust	2022-01-13 06:48:49
4	Joachim Nebel	1389	Rust	2022-12-04 14:59:05
5	Artur Khuziakhmetov	1684	Rust	2023-08-30 15:16:08
6	Andreas Berg	1920	Rust	2021-06-12 15:53:43
7	Hidden user	2004	Rust	2024-08-04 18:51:46
8	Ahmet Talha Öztunca	2061	Rust	2023-07-20 21:53:59
9	Kosuke Onodera	2213	Rust	2025-07-01 01:31:20
10	Raphaël Gauthier	2256	Rust	2020-03-19 13:46:45

#	User	Length	Language	Date
1	Aleksandr Toropov	1569	Swift	2025-09-05 12:32:09

#	User	Length	Language	Date
1	Sean Kenny	3151	TypeScript	2025-12-24 21:23:04

#	User	Length	Language	Date
1	Joe Blower	3201	Zig	2025-05-28 16:23:24
2	Luka Toplak	5968	Zig	2025-06-07 21:30:34

Solution running time distribution