Problem A
The Easiest Problem Is This One — Problem Statistics

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Submissions	14138
Accepted submissions	7728
Submission ratio	54.66%
Authors	7120
Full solves [?]	6723
Full solve Ratio	94.42%

#	User	Runtime	Language	Date
1	Michael Murphy	0.00 s	Ada	2025-04-17 00:54:01

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.08 s	Bash	2024-04-16 16:10:22

#	User	Runtime	Language	Date
1	Wojciech Borowiecki	0.02 s	C#	2014-10-01 18:31:21
2	Jon Wong	0.02 s	C#	2014-10-03 03:25:22
3	masosz	0.02 s	C#	2015-01-19 20:58:44
4	Paweł Borkowski	0.02 s	C#	2015-01-30 18:23:10
5	Bas te Kolste	0.02 s	C#	2015-06-15 21:07:13
6	Mads Storm Hansen	0.02 s	C#	2015-07-12 14:50:34
7	Marco Heinrich	0.02 s	C#	2015-07-20 15:25:32
8	Jonas S	0.02 s	C#	2015-08-02 20:34:35
9	Jens Mossig	0.02 s	C#	2015-08-26 23:38:03
10	Taner Yavuz	0.02 s	C#	2015-09-19 13:29:37

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.04 s	F#	2022-07-11 08:45:41
2	Patrick Bahr	0.05 s	F#	2021-02-13 21:06:10

#	User	Runtime	Language	Date
1	Luna Johnson	0.00 s	Go	2025-01-22 23:12:39
2	Hidden user	0.01 s	Go	2023-08-13 14:11:36
3	Jimmy Nejtron	0.01 s	Go	2023-09-08 17:11:48
4	Ore Oyede	0.01 s	Go	2024-04-05 20:20:42
5	Kiet Pham Tuan	0.01 s	Go	2024-12-02 08:46:31
6	Hossein Jalili	0.01 s	Go	2025-06-04 10:40:27
7	THIRUKUMARAN S	0.01 s	Go	2025-10-13 16:13:44
8	Ross O'Sullivan	0.02 s	Go	2018-08-17 20:28:45
9	Hidden user	0.02 s	Go	2018-10-22 15:24:38
10	Krzysztof Gibuła	0.02 s	Go	2019-02-16 12:20:31

#	User	Runtime	Language	Date
1	Jonas Höglund	0.01 s	Haskell	2014-10-11 23:48:08
2	Hidden user	0.01 s	Haskell	2014-12-11 00:13:05
3	Markus Läll	0.01 s	Haskell	2015-02-12 08:34:06
4	Eskil Andréen	0.01 s	Haskell	2015-02-22 13:06:48
5	David Wärn	0.01 s	Haskell	2015-03-11 17:19:11
6	Lars Tveito	0.01 s	Haskell	2015-06-02 16:48:14
7	Joakim Lundborg	0.01 s	Haskell	2015-09-16 00:11:39
8	Christian Leipe	0.01 s	Haskell	2015-11-30 22:00:23
9	Vincent Chow Zhi Yang	0.01 s	Haskell	2016-01-20 03:20:56
10	Peter Deal	0.01 s	Haskell	2016-05-03 06:05:24

#	User	Runtime	Language	Date
1	Guangyi Zhou	0.04 s	Java	2025-02-03 15:10:52
2	Simon Klein	0.06 s	Java	2011-10-06 19:42:13
3	Jimmy Mårdell	0.06 s	Java	2014-12-28 14:30:36
4	Henrik Sandström	0.06 s	Java	2015-02-05 20:29:29
5	Marco Vincenzo Karaan	0.06 s	Java	2015-07-17 12:38:53
6	Łukasz Antkowiak	0.06 s	Java	2015-09-12 01:05:09
7	Dennis Ang	0.06 s	Java	2015-09-13 08:28:15
8	Hidden user	0.06 s	Java	2015-09-15 06:01:41
9	Michael Sullivan	0.06 s	Java	2015-09-26 07:46:40
10	Ian Leow	0.06 s	Java	2015-12-08 21:14:58

#	User	Runtime	Language	Date
1	Carl Sundvall	0.07 s	JavaScript (Node.js)	2018-10-28 20:39:52
2	Hidden user	0.07 s	JavaScript (Node.js)	2019-07-02 12:54:10
3	Zach Deibert	0.08 s	JavaScript (Node.js)	2018-10-01 04:58:22
4	Gonçalo Novo	0.08 s	JavaScript (Node.js)	2025-07-24 18:44:11
5	Michiel Pauw	0.08 s	JavaScript (Node.js)	2025-09-30 15:28:28
6	Gurushant Gurushant	0.10 s	JavaScript (Node.js)	2023-04-26 22:10:22
7	Hidden user	0.10 s	JavaScript (Node.js)	2024-09-11 20:25:32
8	Antonia Sisneros	0.11 s	JavaScript (Node.js)	2022-12-08 18:50:07
9	Sander Hellesø	0.23 s	JavaScript (Node.js)	2019-04-26 08:47:30
10	Johnny Bravo	0.43 s	JavaScript (Node.js)	2019-08-17 03:17:29

#	User	Runtime	Language	Date
1	Adam Murphy	0.01 s	JavaScript (SpiderMonkey)	2016-03-23 15:36:22
2	Johannes Jensen	0.01 s	JavaScript (SpiderMonkey)	2016-03-30 12:14:26
3	Tor Nordqvist	0.01 s	JavaScript (SpiderMonkey)	2016-11-05 23:43:37
4	Nicklas Utgaard	0.01 s	JavaScript (SpiderMonkey)	2017-12-26 14:52:26
5	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2016-01-11 13:53:48
6	Ionel Hindorean	0.02 s	JavaScript (SpiderMonkey)	2016-10-08 10:05:58
7	Love Almgren	0.02 s	JavaScript (SpiderMonkey)	2016-11-18 18:20:09
8	Mats Krüger Svensson	0.02 s	JavaScript (SpiderMonkey)	2017-03-22 15:43:52
9	Michael Hjortholt	0.02 s	JavaScript (SpiderMonkey)	2017-07-06 14:04:06
10	Peter Kedemo	0.03 s	JavaScript (SpiderMonkey)	2015-12-22 00:16:02

#	User	Runtime	Language	Date
1	Noszály Csaba	0.45 s	Julia	2025-04-06 20:30:23
2	Danny Robinson	0.56 s	Julia	2023-06-21 14:06:18
3	Timothy Gaede	0.62 s	Julia	2024-03-26 01:06:41

#	User	Runtime	Language	Date
1	Jacob Huebner	0.12 s	Kotlin	2020-04-27 03:37:45
2	Thanh Le	0.15 s	Kotlin	2021-08-08 16:20:17
3	Johnny Baloney	0.15 s	Kotlin	2022-02-24 11:21:33
4	James WIlliams	0.20 s	Kotlin	2020-12-30 00:44:01
5	Brent Yorgey	0.22 s	Kotlin	2020-04-29 00:34:54
6	Dayan Ruben Gonzalez	0.22 s	Kotlin	2020-09-27 23:42:39
7	Yang Tang	0.22 s	Kotlin	2023-07-25 06:26:18
8	Mike Wilkes	0.23 s	Kotlin	2018-02-22 02:11:59
9	Kyle Laker	0.24 s	Kotlin	2018-01-16 22:14:27
10	Dmitry Shostak	0.24 s	Kotlin	2018-06-13 16:27:39

#	User	Runtime	Language	Date
1	Erik K	0.00 s	OCaml	2020-11-09 02:58:52

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-05-04 22:50:56

#	User	Runtime	Language	Date
1	David Connolly	0.01 s	Pascal	2017-08-28 16:33:41
2	高梓軒4D16 Ko Tsz Hin	0.04 s	Pascal	2020-01-23 17:28:28

#	User	Runtime	Language	Date
1	Saito Ta	0.08 s	Perl	2024-04-23 10:08:24

#	User	Runtime	Language	Date
1	Martin Dibakar Björling	0.02 s	PHP	2015-11-24 21:37:10
2	Silvena Lam	0.02 s	PHP	2016-02-03 03:12:59
3	Steven D. Wilson	0.02 s	PHP	2016-03-17 04:05:59
4	Petr Trofimov	0.02 s	PHP	2019-07-03 08:14:26
5	Jonas Lindenskov Nielsen	0.02 s	PHP	2019-10-07 19:52:23
6	Renate	0.02 s	PHP	2021-05-24 01:59:38
7	Andre Wahyudi	0.02 s	PHP	2022-10-21 04:56:56
8	Hidden user	0.03 s	PHP	2016-09-25 17:46:57
9	Helbin Grégory	0.03 s	PHP	2021-01-12 15:21:38
10	Rikard Hjort	0.04 s	PHP	2015-04-07 04:23:48

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.06 s	Prolog	2023-02-16 13:48:13
2	Hadi Qovaizi	0.10 s	Prolog	2016-04-14 17:05:33

#	User	Runtime	Language	Date
1	Erik Sillén	0.04 s	Python 2	2011-10-06 18:23:52
2	Niklas Rosén	0.04 s	Python 2	2011-10-24 22:48:01
3	Andreas Serra	0.04 s	Python 2	2013-04-28 00:00:52
4	Alex Bright	0.04 s	Python 2	2014-10-03 22:21:37
5	Daniel Palmqvist	0.04 s	Python 2	2015-01-05 14:08:21
6	Gustaf Waldemarson	0.04 s	Python 2	2015-02-10 18:40:23
7	Hidden user	0.04 s	Python 2	2015-02-10 18:42:21
8	Hidden user	0.04 s	Python 2	2015-02-20 21:39:31
9	Kristmundur Agust	0.04 s	Python 2	2015-02-26 12:30:21
10	Christofer Ohlsson	0.04 s	Python 2	2015-04-10 12:53:38

#	User	Runtime	Language	Date
1	Matthew Kan	0.02 s	Python 3	2018-06-03 08:27:30
2	Bernard Sonja	0.03 s	Python 3	2013-08-16 16:24:53
3	Johannes Agestam	0.03 s	Python 3	2015-06-14 19:33:17
4	Wayne	0.03 s	Python 3	2016-01-23 16:01:08
5	Jacky Blois	0.03 s	Python 3	2016-08-22 21:58:54
6	Fredrik Bondza	0.03 s	Python 3	2016-09-01 22:20:22
7	Hidden user	0.03 s	Python 3	2016-09-07 10:34:43
8	Cristian Baba	0.03 s	Python 3	2016-10-06 10:49:39
9	Marwan Ajl	0.03 s	Python 3	2016-10-11 18:59:02
10	Erik Dyrelius	0.03 s	Python 3	2017-01-25 22:51:34

#	User	Runtime	Language	Date
1	Gerry Hall	0.04 s	Ruby	2016-03-25 07:09:10
2	Hidden user	0.05 s	Ruby	2018-10-22 14:16:24
3	Kellen Watt	0.06 s	Ruby	2016-04-17 06:27:29
4	Sebastian Craig	0.06 s	Ruby	2016-10-18 17:53:42
5	Leonardo Brito	0.06 s	Ruby	2017-01-02 20:36:42
6	Régis Hanol	0.06 s	Ruby	2022-01-14 12:33:29
7	Paul Vinell	0.07 s	Ruby	2018-03-17 18:54:46
8	Thomas Feld	0.07 s	Ruby	2022-11-04 15:22:23
9	Eugen Neagoe	0.07 s	Ruby	2023-03-26 16:25:35
10	Clement Oh	0.07 s	Ruby	2023-10-22 10:16:27

#	User	Runtime	Language	Date
1	Joe Blower	0.00 s	Zig	2025-05-24 03:34:13

#	User	Length	Language	Date
1	Michael Murphy	939	Ada	2025-04-17 00:54:01

#	User	Length	Language	Date
1	Chenzhang Hu	1448	Bash	2024-04-16 16:10:22

#	User	Length	Language	Date
1	Martin Blom	135	C	2023-10-17 18:42:36
2	Ximun Castoreo	283	C	2020-02-17 11:52:37
3	Wesley Stephanak	285	C	2019-02-08 10:55:03
4	Johan Öhlin	296	C	2017-06-26 12:56:30
5	Ang Ray Yan	298	C	2016-12-12 16:33:22
6	Nagata Parama Aptana	300	C	2021-08-10 17:16:31
7	Emil Wihlander	303	C	2020-11-28 20:47:43
8	Patrick Wentzel	306	C	2016-03-08 19:09:41
9	Bogandam Dheeraj	308	C	2017-02-07 21:03:14
10	Christian Lindeström	317	C	2016-08-14 22:31:42

#	User	Length	Language	Date
1	Michael Damsgaard	335	C#	2025-01-05 10:51:27
2	李陆屿	421	C#	2018-12-24 14:32:38
3	Kunwei Zhang	439	C#	2018-02-04 09:34:21
4	Hidden user	444	C#	2016-10-11 23:48:29
5	Göran Andersson	450	C#	2022-05-09 19:59:03
6	Steve Jia	533	C#	2018-08-22 21:47:41
7	Stefan Forsberg	558	C#	2022-04-19 14:09:45
8	Marius Løkketangen	563	C#	2017-03-22 16:01:42
9	Hallvard Braaten	572	C#	2017-03-22 16:04:44
10	Shaun Lazaro	581	C#	2016-11-26 21:18:05

#	User	Length	Language	Date
1	a_b__c	198	C++	2021-08-17 20:36:57
2	Frans Meulenbroeks	234	C++	2025-02-06 16:02:24
3	Antonio Molina Lovett	250	C++	2016-08-05 12:38:58
4	黃浚瑜	264	C++	2022-01-06 13:26:34
5	Yeung Man Tsung	266	C++	2022-11-20 07:24:02
6	Truong Trung Tin	269	C++	2020-06-22 13:42:24
7	Nguyễn Công Cường	273	C++	2019-07-30 15:09:13
8	Vo Thanh Phong	273	C++	2020-06-22 13:44:03
9	Tran Dai Linh Nam	273	C++	2020-06-22 13:45:33
10	Steven Tang	275	C++	2020-12-16 16:56:32

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	622	F#	2022-07-11 08:45:41
2	Patrick Bahr	2115	F#	2021-02-13 21:06:10

#	User	Length	Language	Date
1	Lars Pettersson	274	Go	2016-03-14 02:21:44
2	Neal McCarthy	288	Go	2018-04-22 22:50:28
3	Kristian Alvarez Jörgensen	316	Go	2016-03-22 03:29:17
4	Scott Dauer	332	Go	2020-04-12 21:14:05
5	Hidden user	342	Go	2021-12-18 15:05:43
6	Adam Smith	356	Go	2017-02-15 22:04:14
7	Hidden user	365	Go	2018-10-22 15:24:38
8	Marcin Dudek	369	Go	2016-02-16 13:21:48
9	Eric Martin	375	Go	2018-12-29 23:02:02
10	Nyamdavaa Amar	412	Go	2022-04-19 19:24:12

#	User	Length	Language	Date
1	David Wärn	144	Haskell	2015-03-11 17:19:11
2	Vincent Chow Zhi Yang	202	Haskell	2016-01-20 03:20:56
3	Sebastian Banert	232	Haskell	2023-04-22 23:31:19
4	Carl Agrell	237	Haskell	2016-09-16 17:45:22
5	Llaurence Git	244	Haskell	2018-11-06 22:20:30
6	Sebastian Paaske Tørholm	247	Haskell	2022-12-26 18:31:16
7	Morten Lohne	251	Haskell	2017-10-20 19:47:42
8	Joakim Lundborg	256	Haskell	2015-09-16 00:30:27
9	Freek van Keulen	283	Haskell	2021-02-08 12:56:36
10	Øyvind Haarberg	291	Haskell	2016-10-14 14:33:27

#	User	Length	Language	Date
1	Kee Zhong Ping	391	Java	2019-06-18 14:31:23
2	Doug Goodman	398	Java	2018-05-26 14:35:42
3	Amena Deeb	404	Java	2018-06-04 12:27:48
4	Sirisha Satish	409	Java	2023-06-09 21:50:32
5	Lucas Simmons	420	Java	2024-04-21 23:02:09
6	Pedro Contipelli	421	Java	2016-04-27 23:46:45
7	Emilie Hyslop	430	Java	2020-09-30 07:36:50
8	Hidden user	431	Java	2019-11-14 22:51:19
9	Giovana Alarcao	435	Java	2022-04-08 14:54:50
10	Chao Ge	442	Java	2018-03-23 17:33:07

#	User	Length	Language	Date
1	Antoine Bauri	439	JavaScript (Node.js)	2021-02-19 01:08:55
2	Gonçalo Novo	450	JavaScript (Node.js)	2025-07-24 18:44:11
3	Keith Liam Manaloto	533	JavaScript (Node.js)	2020-09-25 15:23:17
4	Zach Deibert	563	JavaScript (Node.js)	2018-10-01 04:58:22
5	Johnny Bravo	573	JavaScript (Node.js)	2019-08-17 03:17:29
6	Chris Wong	592	JavaScript (Node.js)	2021-02-06 01:03:46
7	Antonia Sisneros	611	JavaScript (Node.js)	2022-12-08 18:50:07
8	Hidden user	653	JavaScript (Node.js)	2023-08-04 04:08:57
9	Devlyn Demmon	686	JavaScript (Node.js)	2019-08-17 03:13:26
10	Michiel Pauw	696	JavaScript (Node.js)	2025-09-30 15:28:28

#	User	Length	Language	Date
1	Jimmy Gustafsson	135	JavaScript (SpiderMonkey)	2024-06-11 22:33:05
2	Evan Magill	242	JavaScript (SpiderMonkey)	2024-04-18 07:25:25
3	Christian Pilegaard Cederquist	274	JavaScript (SpiderMonkey)	2022-11-11 00:13:43
4	Øyvind Skaar	275	JavaScript (SpiderMonkey)	2017-03-22 16:25:09
5	Peter Kedemo	300	JavaScript (SpiderMonkey)	2015-12-22 00:16:02
6	Bernard Perrin	329	JavaScript (SpiderMonkey)	2019-02-06 19:56:41
7	Robin Livesey	338	JavaScript (SpiderMonkey)	2018-04-15 15:42:38
8	Erik Nilsson	367	JavaScript (SpiderMonkey)	2017-07-11 19:40:48
9	Johannes Jensen	372	JavaScript (SpiderMonkey)	2016-03-30 12:14:26
10	Hamza Waqas	382	JavaScript (SpiderMonkey)	2016-10-18 18:33:20

#	User	Length	Language	Date
1	Danny Robinson	253	Julia	2023-06-21 14:06:18
2	Noszály Csaba	266	Julia	2025-04-06 20:30:23
3	Timothy Gaede	792	Julia	2024-03-26 01:06:41

#	User	Length	Language	Date
1	Yang Tang	324	Kotlin	2023-07-25 06:26:18
2	Troy Warmboe	339	Kotlin	2023-04-11 01:15:21
3	Alexandre Conte	343	Kotlin	2021-08-27 00:47:50
4	Dayan Ruben Gonzalez	403	Kotlin	2020-09-27 23:42:39
5	Kyle Laker	419	Kotlin	2018-01-16 22:14:27
6	Dmitry Shostak	423	Kotlin	2018-06-13 16:27:39
7	Albert Pala	425	Kotlin	2021-07-05 22:35:33
8	Colin Gay	458	Kotlin	2019-05-23 22:49:10
9	axl	522	Kotlin	2019-08-05 11:02:34
10	Brent Yorgey	582	Kotlin	2020-04-29 00:34:54

#	User	Length	Language	Date
1	Erik K	1518	OCaml	2020-11-09 02:58:52

#	User	Length	Language	Date
1	Hidden user	554	Odin	2025-05-04 22:50:56

#	User	Length	Language	Date
1	高梓軒4D16 Ko Tsz Hin	479	Pascal	2020-01-23 17:28:28
2	David Connolly	797	Pascal	2017-08-28 16:33:41

#	User	Length	Language	Date
1	Saito Ta	155	Perl	2024-04-23 10:08:24

#	User	Length	Language	Date
1	Steven D. Wilson	195	PHP	2016-03-17 04:05:59
2	Jonas Lindenskov Nielsen	306	PHP	2019-10-07 19:52:23
3	Petr Trofimov	420	PHP	2019-07-03 08:14:26
4	Renate	479	PHP	2021-05-24 01:59:38
5	Hidden user	536	PHP	2016-09-25 17:46:57
6	Rikard Hjort	547	PHP	2015-04-07 04:23:48
7	Silvena Lam	793	PHP	2016-02-03 03:12:59
8	Martin Dibakar Björling	857	PHP	2015-11-24 21:37:10
9	Andre Wahyudi	958	PHP	2022-10-21 04:56:56
10	Helbin Grégory	1257	PHP	2021-01-12 15:21:38

#	User	Length	Language	Date
1	Hakan Kjellerstrand	395	Prolog	2023-02-16 13:48:13
2	Hadi Qovaizi	2154	Prolog	2016-04-14 17:05:33

#	User	Length	Language	Date
1	Thomas Feld	154	Python 2	2019-08-19 11:23:38
2	Alex Dai	155	Python 2	2016-08-18 09:13:32
3	Conor McCauley	188	Python 2	2019-03-20 06:59:16
4	Eric Ge	196	Python 2	2019-10-04 23:38:19
5	Andreas Eisele	198	Python 2	2018-09-28 15:24:26
6	Godmar Back	198	Python 2	2019-01-02 05:58:35
7	Dewa Tegar	199	Python 2	2017-03-24 16:38:38
8	Arne Tobias Malkenes Ødegaard	201	Python 2	2015-09-17 18:18:25
9	Austin Yan	202	Python 2	2020-11-14 19:45:17
10	James Elías Sigurðarson	204	Python 2	2015-03-25 15:20:28

#	User	Length	Language	Date
1	Clement Oh	94	Python 3	2023-06-12 20:25:50
2	Gustav Elmqvist	95	Python 3	2023-02-12 16:52:04
3	Benjamin Z White	99	Python 3	2023-04-10 00:58:00
4	Tommi Järvenpää	99	Python 3	2024-04-08 09:31:41
5	Kevin Gomez	103	Python 3	2024-03-22 02:57:18
6	Tai Tze Kin	123	Python 3	2024-05-01 16:15:44
7	Thomas Draper	128	Python 3	2022-12-13 03:38:42
8	Hidden user	134	Python 3	2025-01-05 12:35:53
9	Jonas Thorsell	140	Python 3	2024-05-30 10:59:58
10	David Skocic	141	Python 3	2025-06-25 02:06:34

#	User	Length	Language	Date
1	Thomas Feld	72	Ruby	2025-08-26 13:08:19
2	Russell Ng	72	Ruby	2025-10-08 18:51:13
3	Régis Hanol	101	Ruby	2022-01-14 12:33:29
4	Clement Oh	104	Ruby	2023-10-22 10:16:27
5	Alexander Bilde Pedersen	108	Ruby	2023-04-30 20:40:31
6	Eugen Neagoe	166	Ruby	2023-03-26 16:25:35
7	Olivia Bednar	226	Ruby	2019-09-03 14:40:27
8	Erik Rydbert	232	Ruby	2016-07-07 11:45:57
9	Keomony Khun	246	Ruby	2016-09-28 21:26:36
10	Gerry Hall	259	Ruby	2016-03-25 07:09:10

#	User	Length	Language	Date
1	Vincent Lagerros	277	Rust	2024-12-03 23:13:35
2	Pankajkumar Patro	465	Rust	2024-09-12 15:23:50
3	Emil Dichmann	498	Rust	2025-09-17 03:22:52
4	Thomas	499	Rust	2023-06-20 19:52:22
5	Shivam Thakur	505	Rust	2019-06-26 12:02:02
6	David Zacek	557	Rust	2021-05-19 02:03:41
7	Robert Janczewski	573	Rust	2020-02-05 15:16:25
8	Chaoyi Yin	648	Rust	2019-04-01 17:08:46
9	Hidden user	648	Rust	2019-05-04 19:03:38
10	Hidden user	651	Rust	2018-11-05 19:54:26

#	User	Length	Language	Date
1	Joe Blower	1009	Zig	2025-05-24 03:34:13

Solution running time distribution