Problem A
4 thought — Problem Statistics

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Submissions	23140
Accepted submissions	7255
Submission ratio	31.35%
Authors	6790
Full solves [?]	5597
Full solve Ratio	82.43%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.03 s	Bash	2024-02-03 07:41:01

#	User	Runtime	Language	Date
1	Joe Amenta	0.04 s	C#	2016-04-09 19:45:43
2	Tristan Close	0.04 s	C#	2017-03-14 21:51:05
3	Mikael Fiala-Lundström	0.04 s	C#	2018-01-27 16:56:49
4	Thomas Norris	0.04 s	C#	2019-06-24 23:58:39
5	Rasmus Leyes	0.04 s	C#	2019-11-18 11:43:54
6	ratla	0.04 s	C#	2022-01-17 20:24:48
7	Esty Crow	0.04 s	C#	2025-08-08 20:31:01
8	Daouda Camara	0.05 s	C#	2015-09-17 12:38:37
9	Håkan Sjöström	0.05 s	C#	2015-10-27 09:25:38
10	Samuel Wrååk	0.05 s	C#	2016-06-30 19:25:48

#	User	Runtime	Language	Date
1	David Cawthon	0.03 s	Common Lisp	2019-04-12 18:03:49

#	User	Runtime	Language	Date
1	dick move	0.00 s	Crystal	2025-09-27 17:04:24

#	User	Runtime	Language	Date
1	Fustiki Scuria	0.01 s	D	2024-05-26 07:51:50

#	User	Runtime	Language	Date
1	Kalle Johansson	0.01 s	Dart	2023-06-29 10:29:09

#	User	Runtime	Language	Date
1	Thanh Dinh Ta	0.09 s	F#	2022-07-21 04:59:22
2	Elias Illeris Poggi	0.09 s	F#	2025-02-28 11:03:49
3	Simon Egeberg Svarre	0.09 s	F#	2025-09-23 12:48:25
4	Jacob Harris Cryer Kragh	0.12 s	F#	2023-06-10 14:53:13
5	Magnus Baasch Langkilde	0.12 s	F#	2025-03-05 14:19:09

#	User	Runtime	Language	Date
1	Jesper Larsson	0.04 s	Java	2015-09-28 20:20:49
2	Michael Sullivan	0.04 s	Java	2015-10-13 02:49:49
3	Marius de Vogel	0.04 s	Java	2016-04-02 23:56:52
4	Jonathan Marino	0.04 s	Java	2016-04-25 20:21:57
5	Joachim Nybo	0.04 s	Java	2016-09-17 00:16:58
6	Samuel Klingström	0.04 s	Java	2017-05-05 12:33:55
7	Martin Wiberg Petersen	0.04 s	Java	2017-07-11 22:45:02
8	Liam Keliher	0.04 s	Java	2019-01-29 14:52:30
9	Willem Greenwood	0.04 s	Java	2019-03-09 04:30:10
10	Huang Weijie	0.04 s	Java	2019-04-18 15:17:38

#	User	Runtime	Language	Date
1	Chris Wong	0.04 s	JavaScript (Node.js)	2021-02-28 23:54:20
2	davidperjac	0.04 s	JavaScript (Node.js)	2025-05-17 16:55:41
3	Baptiste Keunebroek	0.04 s	JavaScript (Node.js)	2025-08-23 11:50:19
4	Hidden user	0.04 s	JavaScript (Node.js)	2025-08-23 12:35:31
5	Marc Fong	0.05 s	JavaScript (Node.js)	2021-05-17 13:51:38
6	Samuel Högfeldt	0.05 s	JavaScript (Node.js)	2022-06-18 21:34:07
7	Hidden user	0.05 s	JavaScript (Node.js)	2024-06-11 23:06:55
8	Nicolas Bessoles	0.05 s	JavaScript (Node.js)	2025-09-04 17:28:49
9	Ihor Kolisnyk	0.05 s	JavaScript (Node.js)	2025-10-07 09:03:34
10	Marius Alexander Winsjansen	0.06 s	JavaScript (Node.js)	2020-07-29 03:28:15

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

#	User	Runtime	Language	Date
1	Timothy Gaede	0.48 s	Julia	2024-05-01 03:46:28
2	Noszály Csaba	0.51 s	Julia	2025-04-16 18:11:11

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

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.00 s	Lua	2023-11-14 00:53:05

#	User	Runtime	Language	Date
1	Samuel Jefferis	0.00 s	OCaml	2020-11-01 16:04:29

#	User	Runtime	Language	Date
1	Yashdeep Singh	0.01 s	Odin	2024-11-11 08:18:35

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-06-21 13:59:37
2	David Connolly	0.04 s	Pascal	2019-01-23 16:00:30

#	User	Runtime	Language	Date
1	Susanne Ragnemalm	0.01 s	PHP	2018-04-01 13:22:21
2	Temirbek	0.01 s	PHP	2022-04-05 15:05:49
3	Victor Santos	0.03 s	PHP	2024-08-23 19:43:06
4	Mohammed Yousif	0.04 s	PHP	2018-04-26 19:08:52

#	User	Runtime	Language	Date
1	Thanh Do Quang	0.07 s	Python 2	2015-09-11 13:04:30
2	Lars Tveito	0.07 s	Python 2	2015-09-18 02:03:50
3	Robin Curbelo	0.07 s	Python 2	2015-09-29 00:40:20
4	Fredrika Agestam	0.07 s	Python 2	2015-10-04 18:15:35
5	Fredrik Nordin	0.07 s	Python 2	2015-10-08 18:37:21
6	Arne Tobias Malkenes Ødegaard	0.07 s	Python 2	2015-12-01 18:56:19
7	Neal Zane	0.07 s	Python 2	2015-12-08 03:06:42
8	Ethan Arnold	0.07 s	Python 2	2015-12-18 23:20:44
9	Hidden user	0.07 s	Python 2	2015-12-20 07:44:47
10	Marcus Johansson	0.07 s	Python 2	2016-08-11 23:46:02

#	User	Runtime	Language	Date
1	Kadriye Yildiz	0.04 s	Python 3	2024-08-28 15:58:53
2	Hidden user	0.04 s	Python 3	2024-09-01 14:47:44
3	Magnus J Moldekleiv	0.04 s	Python 3	2024-09-01 20:21:19
4	Einar Aleksander Arnes	0.04 s	Python 3	2024-09-01 20:31:20
5	Oliver Adser	0.04 s	Python 3	2024-09-02 00:05:16
6	Perry Weller (student)	0.04 s	Python 3	2024-09-05 01:43:49
7	Joshua Dinh	0.04 s	Python 3	2024-09-07 02:28:27
8	Pablo Achá	0.04 s	Python 3	2024-09-09 06:06:10
9	Sander Oppen	0.04 s	Python 3	2024-09-09 19:18:07
10	cera	0.04 s	Python 3	2024-09-10 06:18:45

#	User	Runtime	Language	Date
1	Casper Christensen	0.07 s	Ruby	2016-01-10 23:24:25
2	Hidden user	0.07 s	Ruby	2017-10-23 12:50:24
3	Hidden user	0.07 s	Ruby	2018-10-10 16:29:57
4	Lim Ming Yean	0.07 s	Ruby	2018-12-08 09:40:20
5	Mark Donald Amobi	0.07 s	Ruby	2019-02-13 04:30:01
6	Adam Hellberg	0.07 s	Ruby	2019-09-30 22:33:21
7	John Rabaey	0.07 s	Ruby	2020-04-10 17:52:43
8	Alexander Bilde Pedersen	0.07 s	Ruby	2023-04-08 22:23:15
9	Clement Oh	0.07 s	Ruby	2023-10-31 12:51:02
10	Chris Johnson	0.07 s	Ruby	2024-09-06 22:39:15

#	User	Runtime	Language	Date
1	Aleksandr Toropov	0.00 s	Swift	2025-09-05 14:32:09

#	User	Runtime	Language	Date
1	Joe Blower	0.00 s	Zig	2025-05-28 18:23:24
2	Luka Toplak	0.00 s	Zig	2025-06-07 23:30:34

#	User	Length	Language	Date
1	Chenzhang Hu	931	Bash	2024-02-03 07:41:01

#	User	Length	Language	Date
1	Mattias Andrée	759	C	2018-04-29 22:30:12
2	Tjandra Satria Gunawan	1102	C	2015-09-11 13:10:29
3	Christian Mortensen	1283	C	2018-02-25 15:50:17
4	Axel Lindeberg	1312	C	2018-12-30 10:46:48
5	Axel Lindeberg	1312	C	2018-12-30 14:37:50
6	Hidden user	1405	C	2017-07-17 16:03:48
7	Ravi Shankar Reddy Kanakaveeti	1413	C	2015-09-21 15:57:41
8	Riccardo Sven Risuleo	1457	C	2017-07-21 22:15:31
9	Hidden user	1485	C	2016-08-26 08:22:22
10	Viet Anh Ho	1542	C	2016-05-16 11:33:05

#	User	Length	Language	Date
1	Sabba Ifzal	827	C#	2023-06-21 20:52:51
2	Jacob Carlsson	1037	C#	2022-02-22 19:32:09
3	Ali Aliev	1114	C#	2024-08-09 14:23:28
4	Amit Vajrashetti	1120	C#	2025-05-26 20:51:08
5	Esty Crow	1159	C#	2025-08-08 20:31:01
6	Tristan Close	1247	C#	2017-03-14 21:51:05
7	Nicholas Johansan	1267	C#	2023-05-26 18:27:12
8	Rasmus Leyes	1273	C#	2019-11-18 11:34:54
9	Daniel Olsson	1365	C#	2019-10-25 10:11:56
10	Skjold Rammer Novak	1429	C#	2023-09-06 12:29:55

#	User	Length	Language	Date
1	traxex	596	C++	2021-12-06 00:01:45
2	José Ramón Morera	634	C++	2025-10-25 13:20:27
3	Hyunjun Lee	703	C++	2022-11-22 13:44:46
4	Hoàng Bá Tuân	706	C++	2018-04-16 18:18:09
5	Hidden user	729	C++	2022-04-14 15:55:18
6	Yeung Man Tsung	735	C++	2022-12-30 14:48:52
7	Ahmed Chamseddine	763	C++	2022-11-18 16:26:47
8	HuangWenYuan	783	C++	2024-10-01 23:00:47
9	Ar Ma	787	C++	2019-04-25 09:01:51
10	Herman Karlsson	822	C++	2015-09-10 19:59:24

#	User	Length	Language	Date
1	David Cawthon	2393	Common Lisp	2019-04-12 18:03:49

#	User	Length	Language	Date
1	dick move	1214	Crystal	2025-09-27 17:04:24

#	User	Length	Language	Date
1	Fustiki Scuria	3664	D	2024-05-26 07:51:50

#	User	Length	Language	Date
1	Kalle Johansson	943	Dart	2023-06-29 10:29:09

#	User	Length	Language	Date
1	Magnus Baasch Langkilde	789	F#	2025-03-05 14:19:09
2	Thanh Dinh Ta	2018	F#	2022-07-21 12:09:55
3	Simon Egeberg Svarre	2413	F#	2025-09-23 12:48:25
4	Jacob Harris Cryer Kragh	2742	F#	2023-06-10 14:53:13
5	Elias Illeris Poggi	4748	F#	2025-02-28 11:03:49

#	User	Length	Language	Date
1	ffsx	875	Go	2025-10-10 05:45:50
2	Christopher Fjellström	930	Go	2016-10-08 02:45:25
3	Jesper Bech Christensen	1133	Go	2022-03-08 13:13:44
4	Christoffer Danborg Irvall	1333	Go	2019-04-21 22:31:11
5	My Name	1483	Go	2018-11-06 14:07:46
6	Marcus Henrik Simonsen	1887	Go	2022-10-30 20:06:50
7	Scott Dauer	1910	Go	2020-07-07 19:35:21
8	Norbert Voelker	2371	Go	2021-03-31 01:13:35
9	Lars Pensjö	2834	Go	2023-08-30 17:56:04
10	Iker Lissarrague	3260	Go	2022-03-06 20:39:57

#	User	Length	Language	Date
1	Aaron Allen	828	Haskell	2021-06-16 06:44:46
2	Hidden user	869	Haskell	2021-11-18 16:14:28
3	Abel Martin	940	Haskell	2018-11-18 20:27:44
4	Esther Chong	957	Haskell	2017-12-11 09:34:48
5	Fabian Mitterwallner	959	Haskell	2025-07-31 14:36:13
6	Tobias Bengtsson	975	Haskell	2018-11-13 16:24:33
7	Zach Tschetter	981	Haskell	2021-01-23 21:48:45
8	Abdul Haliq	1009	Haskell	2018-05-28 14:44:58
9	Andrés Marzal Varó	1020	Haskell	2020-09-29 17:55:23
10	Justyn Oh	1040	Haskell	2019-07-03 00:20:21

#	User	Length	Language	Date
1	Henry Morco	1023	Java	2016-05-28 15:51:13
2	David Gawel	1043	Java	2020-09-14 08:03:32
3	Markus Bao	1109	Java	2023-10-02 21:15:48
4	Marco Vincenzo Karaan	1119	Java	2015-10-03 08:25:25
5	Edward Flores	1142	Java	2019-09-20 18:24:43
6	Abhijit Singh	1144	Java	2017-04-08 18:44:43
7	Thomas Anung Basuki	1146	Java	2025-06-24 06:17:37
8	Zimu Qin	1149	Java	2015-09-19 16:40:15
9	Robert Nix	1207	Java	2017-09-13 19:50:03
10	Ann Chapple	1207	Java	2019-10-10 01:13:53

#	User	Length	Language	Date
1	Marius Alexander Winsjansen	943	JavaScript (Node.js)	2020-07-29 03:39:35
2	Jesper Svendgaard Åhman Hansen	1054	JavaScript (Node.js)	2020-07-29 03:35:19
3	Ihor Kolisnyk	1055	JavaScript (Node.js)	2025-10-07 09:03:34
4	davidperjac	1276	JavaScript (Node.js)	2025-05-17 16:55:41
5	Hidden user	1358	JavaScript (Node.js)	2025-08-23 12:35:31
6	Hidden user	1480	JavaScript (Node.js)	2024-06-11 23:11:07
7	Simon Ekizean	1609	JavaScript (Node.js)	2021-01-19 21:44:37
8	Samuel Högfeldt	1715	JavaScript (Node.js)	2022-06-18 21:34:07
9	Baptiste Keunebroek	1722	JavaScript (Node.js)	2025-08-23 11:50:50
10	Nicolas Bessoles	1815	JavaScript (Node.js)	2025-09-04 17:28:49

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	468	JavaScript (SpiderMonkey)	2023-02-19 08:53:02
2	Nguyễn Đại Dương	515	JavaScript (SpiderMonkey)	2018-08-06 06:36:05
3	Nguyễn Hùng Cường	577	JavaScript (SpiderMonkey)	2018-08-06 05:38:33
4	Bjørn Chr. Soltvedt	600	JavaScript (SpiderMonkey)	2016-01-01 15:45:37
5	Anton Lundqvist	602	JavaScript (SpiderMonkey)	2017-05-25 19:09:59
6	Knut Salomonsson	652	JavaScript (SpiderMonkey)	2016-11-10 18:53:30
7	Christian LaCourt	744	JavaScript (SpiderMonkey)	2016-10-19 00:08:12
8	Tor Nordqvist	773	JavaScript (SpiderMonkey)	2016-10-31 16:27:56
9	Paul Leung	869	JavaScript (SpiderMonkey)	2017-08-29 17:46:00
10	Peter Kedemo	897	JavaScript (SpiderMonkey)	2016-09-21 20:17:47

#	User	Length	Language	Date
1	Noszály Csaba	462	Julia	2025-04-16 18:11:11
2	Timothy Gaede	970	Julia	2024-05-01 03:46:28

#	User	Length	Language	Date
1	Mohsen Dehbashi	771	Kotlin	2019-11-02 09:18:08
2	Min-Zheng Shieh	948	Kotlin	2021-04-09 09:14:42
3	Mohamadhassan Ebrahimi	978	Kotlin	2019-10-31 23:13:47
4	Allen Guan	1442	Kotlin	2022-04-01 14:29:02
5	Dmitry Shostak	1579	Kotlin	2018-08-23 08:42:45
6	Emil Saric	1756	Kotlin	2017-11-10 11:23:35
7	Sam Keyser	1808	Kotlin	2023-01-24 16:21:10
8	Isaac Owomugisha	1865	Kotlin	2020-09-03 15:54:39
9	Jacob Huebner	2247	Kotlin	2020-02-28 06:01:56
10	Hidden user	2498	Kotlin	2017-11-24 08:42:07

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	826	Lua	2023-11-14 00:53:05

#	User	Length	Language	Date
1	Samuel Jefferis	1494	OCaml	2020-11-01 16:04:29

#	User	Length	Language	Date
1	Yashdeep Singh	3184	Odin	2024-11-11 08:18:35

#	User	Length	Language	Date
1	Ingemar Ragnemalm	3455	Pascal	2018-06-21 13:59:37
2	David Connolly	6856	Pascal	2019-01-23 16:00:30

#	User	Length	Language	Date
1	Temirbek	616	PHP	2022-04-05 15:05:49
2	Victor Santos	1489	PHP	2024-08-23 20:02:03
3	Mohammed Yousif	1490	PHP	2018-04-26 19:08:52
4	Susanne Ragnemalm	2107	PHP	2018-04-01 13:22:21

#	User	Length	Language	Date
1	Thomas Feld	200	Python 2	2019-08-19 14:23:37
2	Johan Wieslander	220	Python 2	2016-12-13 15:13:32
3	Martin Wan	228	Python 2	2018-01-23 03:50:10
4	Andreas Eisele	231	Python 2	2018-09-04 14:36:33
5	Antonio Molina Lovett	236	Python 2	2016-08-15 10:40:47
6	Duncan Page	255	Python 2	2017-11-09 23:03:34
7	Dmitry Lyubshin	279	Python 2	2018-04-03 23:56:10
8	Neal Zane	281	Python 2	2015-12-08 03:06:42
9	Hidden user	302	Python 2	2018-03-02 22:14:49
10	Luke Witt	302	Python 2	2018-03-23 16:14:31

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

#	User	Length	Language	Date
1	Thomas Feld	115	Ruby	2023-05-04 14:51:36
2	Alexander Bilde Pedersen	181	Ruby	2023-04-08 22:23:15
3	Clement Oh	200	Ruby	2023-10-31 12:51:02
4	Mark Donald Amobi	241	Ruby	2019-02-13 04:30:01
5	Daniel Harder	251	Ruby	2018-10-09 18:53:32
6	Hidden user	324	Ruby	2018-10-10 16:33:02
7	Hidden user	330	Ruby	2017-10-23 12:50:24
8	Casper Christensen	338	Ruby	2016-01-10 23:24:25
9	Lim Ming Yean	364	Ruby	2018-12-08 09:40:20
10	Chris Vilches	402	Ruby	2021-10-31 11:27:58

#	User	Length	Language	Date
1	Vincent Lagerros	1146	Rust	2025-07-16 15:13:57
2	Arturas Aleksandraus	1266	Rust	2024-01-25 09:31:49
3	Bas Dirks	1364	Rust	2022-01-13 07:48:49
4	Joachim Nebel	1389	Rust	2022-12-04 15:59:05
5	Artur Khuziakhmetov	1684	Rust	2023-08-30 17:16:08
6	Andreas Berg	1920	Rust	2021-06-12 17:53:43
7	Hidden user	2004	Rust	2024-08-04 20:51:46
8	Ahmet Talha Öztunca	2061	Rust	2023-07-20 23:53:59
9	Kosuke Onodera	2213	Rust	2025-07-01 03:31:20
10	Raphaël Gauthier	2256	Rust	2020-03-19 14:46:45

#	User	Length	Language	Date
1	Aleksandr Toropov	1569	Swift	2025-09-05 14:32:09

#	User	Length	Language	Date
1	Joe Blower	3201	Zig	2025-05-28 18:23:24
2	Luka Toplak	5968	Zig	2025-06-07 23:30:34

Solution running time distribution