Problem A
Herman — Problem Statistics

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Submissions	9885
Accepted submissions	4646
Submission ratio	47.00%
Authors	4423
Full solves [?]	4176
Full solve Ratio	94.42%

#	User	Runtime	Language	Date
1	Thomas Feld	0.01 s	APL	2023-03-09 09:58:49

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.01 s	Bash	2023-11-16 15:40:29
2	Thomas Feld	0.06 s	Bash	2023-09-27 09:31:17

#	User	Runtime	Language	Date
1	Ugnius Skučas	0.01 s	C#	2016-10-06 22:57:33
2	Joakim Östlund	0.01 s	C#	2016-12-12 14:52:58
3	Alex Telon	0.01 s	C#	2017-10-21 12:55:12
4	Kunwei Zhang	0.01 s	C#	2018-02-04 13:23:41
5	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-06-06 19:21:30
6	Robert Low	0.02 s	C#	2016-07-16 17:19:27
7	Duelene Olson	0.02 s	C#	2016-10-04 15:22:39
8	Klas af Geijerstam	0.02 s	C#	2016-12-07 22:00:19
9	Hidden user	0.02 s	C#	2016-12-25 01:02:39
10	Jens Mossig	0.02 s	C#	2017-02-12 15:58:29

#	User	Runtime	Language	Date
1	David Cawthon	0.02 s	Common Lisp	2019-04-25 03:22:57

#	User	Runtime	Language	Date
1	Bobby Jonathan	0.01 s	Dart	2023-08-21 04:12:58

#	User	Runtime	Language	Date
1	Mads Jespersen	0.04 s	F#	2020-02-24 21:23:25
2	Hidden user	0.04 s	F#	2020-08-17 17:06:05
3	Jacob Harris Cryer Kragh	0.04 s	F#	2022-06-19 20:12:42

#	User	Runtime	Language	Date
1	Theo Coyne Morgan	0.01 s	Go	2019-03-26 22:08:24
2	Krzysztof Gibuła	0.02 s	Go	2019-01-18 22:44:16
3	Felix Fatum	0.02 s	Go	2022-09-21 20:31:22
4	Hidden user	0.07 s	Go	2018-10-11 19:40:15
5	Austin Benoit	0.07 s	Go	2018-10-24 19:09:24
6	Neal McCarthy	0.07 s	Go	2018-10-28 21:30:36
7	Lim Ming Yean	0.07 s	Go	2018-11-16 08:05:49
8	Hidden user	0.07 s	Go	2019-11-23 17:23:34
9	Aurélien Brabant	0.07 s	Go	2020-11-12 18:09:51
10	Adam Smith	0.08 s	Go	2017-03-09 21:34:33

#	User	Runtime	Language	Date
1	Jorus Barba	0.04 s	Java	2025-03-21 01:51:13
2	Guangyi Zhou	0.04 s	Java	2025-07-11 04:16:43
3	Jonas Aule	0.05 s	Java	2010-05-19 15:30:52
4	Staffan Rydström	0.05 s	Java	2010-05-19 16:53:48
5	Fredrik Atmer	0.05 s	Java	2010-05-25 09:11:37
6	Erik Odenman	0.05 s	Java	2011-09-07 17:44:24
7	Terrence Park	0.05 s	Java	2016-03-30 20:28:06
8	Hidden user	0.05 s	Java	2016-04-01 23:10:38
9	Nick Wu	0.05 s	Java	2016-04-06 03:15:09
10	Omar Brome	0.05 s	Java	2016-04-08 20:45:10

#	User	Runtime	Language	Date
1	Carl Sundvall	0.05 s	JavaScript (Node.js)	2018-10-27 18:25:00
2	José Lucas	0.05 s	JavaScript (Node.js)	2019-03-15 19:50:27
3	Matheus Vieira	0.05 s	JavaScript (Node.js)	2019-03-15 21:24:08
4	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-04-14 08:03:25
5	Sander Hellesø	0.05 s	JavaScript (Node.js)	2019-04-16 06:37:05
6	Hidden user	0.05 s	JavaScript (Node.js)	2019-07-02 13:23:16
7	Thiago Felipe Bastos da Silva	0.09 s	JavaScript (Node.js)	2023-05-24 19:26:29
8	Chris Wong	0.41 s	JavaScript (Node.js)	2021-02-08 00:31:34
9	Nicolae Bumbu	0.42 s	JavaScript (Node.js)	2020-01-16 13:58:19
10	Francois Pichot	0.42 s	JavaScript (Node.js)	2020-01-18 00:16:23

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-04-03 14:51:03
2	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2016-04-10 21:57:49
3	Fernando Dettoni	0.01 s	JavaScript (SpiderMonkey)	2016-10-18 20:21:23
4	Tor Nordqvist	0.01 s	JavaScript (SpiderMonkey)	2016-10-25 15:48:41
5	J M	0.01 s	JavaScript (SpiderMonkey)	2016-11-12 16:23:02
6	Mohammad Mousavi	0.01 s	JavaScript (SpiderMonkey)	2017-01-02 07:10:12
7	Spencer Smith	0.01 s	JavaScript (SpiderMonkey)	2017-06-06 23:35:43
8	Michael Hjortholt	0.01 s	JavaScript (SpiderMonkey)	2017-07-11 16:42:11
9	Davíð Helgason	0.01 s	JavaScript (SpiderMonkey)	2017-08-07 19:40:29
10	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-08 19:34:08

#	User	Runtime	Language	Date
1	Danny Robinson	0.50 s	Julia	2023-09-26 10:52:58
2	Timothy Gaede	0.51 s	Julia	2024-03-25 06:23:24

#	User	Runtime	Language	Date
1	Alexandre Conte	0.14 s	Kotlin	2020-09-14 23:56:49
2	Dayan Ruben Gonzalez	0.15 s	Kotlin	2020-09-27 22:26:27
3	Jacob Huebner	0.17 s	Kotlin	2020-06-25 02:33:18
4	arda atci	0.17 s	Kotlin	2020-07-04 20:30:47
5	Albert Pala	0.17 s	Kotlin	2021-07-12 14:24:05
6	SatishKumar Gollapudi	0.17 s	Kotlin	2023-06-26 07:22:02
7	Adam Rankin	0.18 s	Kotlin	2023-04-22 02:30:37
8	Karl Johan Heimark	0.18 s	Kotlin	2024-05-23 20:14:31
9	Neil Harmon	0.19 s	Kotlin	2019-04-03 10:28:49
10	axl	0.19 s	Kotlin	2019-08-05 14:28:28

#	User	Runtime	Language	Date
1	Zeheng Li	0.00 s	Lua	2023-12-13 00:28:32

#	User	Runtime	Language	Date
1	Rafael Rivas	0.00 s	Objective-C	2018-01-03 10:10:53

#	User	Runtime	Language	Date
1	Runze Wang	0.00 s	OCaml	2020-09-26 17:17:15
2	Jinwoo Lee	0.00 s	OCaml	2022-11-26 03:21:19

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-05-24 23:32:44

#	User	Runtime	Language	Date
1	David Connolly	0.00 s	Pascal	2017-08-18 17:34:07
2	Vova Podkorytov	0.00 s	Pascal	2018-01-22 16:12:10
3	Egor Shchetinin	0.00 s	Pascal	2018-01-22 16:13:27
4	Vitas	0.00 s	Pascal	2019-12-26 14:57:45

#	User	Runtime	Language	Date
1	Steven D. Wilson	0.01 s	PHP	2016-11-17 02:47:00
2	Rodrigo Erazo Hermosilla	0.01 s	PHP	2020-11-21 05:44:07
3	Petr Trofimov	0.01 s	PHP	2021-04-24 12:16:28
4	Renate	0.01 s	PHP	2021-07-17 22:43:12
5	Andre Wahyudi	0.01 s	PHP	2022-12-12 09:21:06
6	Thomas Feld	0.01 s	PHP	2023-01-31 13:28:22

#	User	Runtime	Language	Date
1	Hadi Qovaizi	0.01 s	Prolog	2016-04-17 20:48:15
2	Andriy Zyevakov	0.01 s	Prolog	2018-08-27 19:23:00
3	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-25 11:08:13

#	User	Runtime	Language	Date
1	Scott Handelman	0.02 s	Python 2	2016-04-19 03:58:30
2	Martin Sundin	0.02 s	Python 2	2016-04-20 15:01:53
3	Hasan Ramezani	0.02 s	Python 2	2016-07-16 21:35:10
4	Erik Sillén	0.02 s	Python 2	2016-08-07 19:38:51
5	Maksym Bendeberia	0.02 s	Python 2	2016-08-23 17:28:55
6	Lars Lindgren	0.02 s	Python 2	2016-09-15 06:17:03
7	Bernhard Kartefla	0.02 s	Python 2	2016-09-30 11:38:05
8	Lim Hong Hui Eugene	0.02 s	Python 2	2016-10-02 18:49:10
9	Victor Barbarosh	0.02 s	Python 2	2016-10-11 15:13:12
10	Robin Gunning	0.02 s	Python 2	2016-10-31 15:30:31

#	User	Runtime	Language	Date
1	Mikael Hedin	0.02 s	Python 3	2016-03-30 17:31:35
2	Robert Welin-Berger	0.02 s	Python 3	2016-03-30 18:30:03
3	Wayne	0.02 s	Python 3	2016-03-30 19:15:54
4	Karoliina Oksanen	0.02 s	Python 3	2016-03-31 16:00:29
5	Clint Nieuwendijk	0.02 s	Python 3	2016-04-04 15:58:55
6	Bjarki Stefánsson	0.02 s	Python 3	2016-04-20 17:11:51
7	William Fiset	0.02 s	Python 3	2016-05-09 02:23:07
8	Magnus Thomé	0.02 s	Python 3	2016-05-31 13:53:18
9	Arnar Bjarni Arnarson	0.02 s	Python 3	2016-06-19 20:17:16
10	Hannes Kristján Hannesson	0.02 s	Python 3	2016-06-19 21:27:14

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-04-12 21:18:25
2	Lasse Berglund	0.03 s	Ruby	2016-04-21 13:33:59
3	Paul Vinell	0.03 s	Ruby	2018-04-08 12:27:24
4	Hidden user	0.04 s	Ruby	2018-10-11 19:36:25
5	Kellen Watt	0.04 s	Ruby	2018-11-24 06:21:51
6	Savvas Alexandrou	0.04 s	Ruby	2018-12-03 08:27:59
7	Hidden user	0.04 s	Ruby	2019-02-16 20:46:40
8	Hidden user	0.04 s	Ruby	2019-03-15 19:59:55
9	Davi Guimarães Leite	0.04 s	Ruby	2019-03-15 20:00:12
10	Victor Souza	0.04 s	Ruby	2019-03-15 20:10:44

#	User	Length	Language	Date
1	Thomas Feld	37	APL	2023-03-09 09:58:49

#	User	Length	Language	Date
1	Thomas Feld	33	Bash	2023-09-27 09:31:17
2	Chenzhang Hu	33	Bash	2025-09-13 17:45:16

#	User	Length	Language	Date
1	Martin Blom	86	C	2023-12-22 15:11:09
2	Jonatan Altebro	99	C	2024-12-17 16:56:00
3	Wesley Stephanak	120	C	2019-02-06 00:47:06
4	Seth Carter	124	C	2017-11-27 06:57:23
5	Dylan Mcdougall	125	C	2020-08-30 02:21:18
6	Emil Wihlander	127	C	2020-11-29 02:28:03
7	Matthew Weston	131	C	2022-01-03 21:46:43
8	Jeran Salcedo	134	C	2018-03-15 10:51:07
9	紅茶	134	C	2023-03-17 17:55:33
10	Fredrik Atmer	140	C	2010-05-25 09:04:38

#	User	Length	Language	Date
1	Anthony Ye	211	C#	2025-02-14 20:31:12
2	Kunwei Zhang	213	C#	2018-02-04 13:23:41
3	Esty Crow	213	C#	2025-01-17 16:19:52
4	Peter Nordh	221	C#	2018-06-05 22:15:13
5	Chase Oberg	234	C#	2018-01-19 15:27:27
6	Eric Bäckhage	260	C#	2019-02-04 21:28:06
7	Gustav Kalander	271	C#	2018-06-08 20:15:21
8	Steve Jia	271	C#	2018-08-30 16:44:22
9	Armin Krauss	271	C#	2018-11-11 10:03:14
10	Krishnasai Chaluvadi	275	C#	2023-09-07 20:04:44

#	User	Length	Language	Date
1	黃太陽	120	C++	2021-09-25 17:12:00
2	Lawrence Li	138	C++	2016-04-12 12:12:08
3	Evan Arlian	140	C++	2018-12-25 07:50:35
4	Đậu Huy Minh	140	C++	2022-10-17 19:26:34
5	Richard Putra	141	C++	2017-11-22 14:22:19
6	Iles Illés Tamás	141	C++	2019-07-25 15:02:43
7	Rendy Ardianto	141	C++	2019-10-10 03:07:02
8	Vincent Gunawan Sutil	142	C++	2018-09-07 11:51:58
9	Henry Morco	146	C++	2016-11-23 12:37:39
10	Frederick Pek	146	C++	2021-05-27 17:18:45

#	User	Length	Language	Date
1	David Cawthon	115	Common Lisp	2019-04-25 03:22:57

#	User	Length	Language	Date
1	Bobby Jonathan	208	Dart	2023-08-21 04:12:58

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	189	F#	2022-06-19 20:12:42
2	Mads Jespersen	386	F#	2020-02-24 21:23:25
3	Hidden user	436	F#	2020-08-17 17:06:05

#	User	Length	Language	Date
1	Hidden user	147	Go	2018-10-11 19:40:15
2	Aurélien Brabant	149	Go	2020-11-12 18:31:59
3	Wojtek Bednarzak	150	Go	2018-04-30 20:52:08
4	Theo Coyne Morgan	188	Go	2019-03-26 22:08:24
5	Lim Ming Yean	197	Go	2018-11-16 08:05:49
6	Hidden user	247	Go	2017-03-29 14:08:17
7	Adam Smith	260	Go	2017-03-09 21:34:33
8	Krzysztof Gibuła	325	Go	2019-01-18 22:44:16
9	Felix Fatum	334	Go	2022-09-21 20:31:22
10	Diogo Lima	354	Go	2020-09-30 22:57:36

#	User	Length	Language	Date
1	Rudy Matela	56	Haskell	2023-09-21 15:07:46
2	Greg Rosser	61	Haskell	2024-02-27 10:40:02
3	Frederik Haagensen	69	Haskell	2021-07-16 10:46:35
4	Hidden user	78	Haskell	2018-10-11 19:38:12
5	Johan Meier	83	Haskell	2017-01-06 03:55:39
6	Aaron Lengyel	84	Haskell	2022-07-05 07:22:22
7	Peter Deal	85	Haskell	2016-05-14 15:47:47
8	Miguel Müller	92	Haskell	2017-11-30 20:57:15
9	Steinar Simonnes	94	Haskell	2023-12-09 17:02:57
10	Hidden user	95	Haskell	2019-12-22 18:45:01

#	User	Length	Language	Date
1	Axel Nilsson	169	Java	2023-09-26 18:17:01
2	Nikita Zinoviev	208	Java	2020-01-04 22:42:23
3	Stela Palii	212	Java	2017-11-09 05:32:29
4	Nay Thit	212	Java	2019-10-12 11:19:59
5	Ferdinand Rönngren	218	Java	2019-06-07 15:33:12
6	Destiny S Mhishi	222	Java	2016-04-11 03:29:18
7	Hidden user	226	Java	2019-04-29 01:49:21
8	Ronak Malik	230	Java	2018-06-13 21:06:02
9	Kabir M	231	Java	2020-05-05 05:40:43
10	Eric Leow Yu Quan	231	Java	2020-12-09 13:32:07

#	User	Length	Language	Date
1	Manuel Spigolon	273	JavaScript (Node.js)	2020-09-03 21:36:32
2	jcjacky	274	JavaScript (Node.js)	2020-11-01 16:16:00
3	Emil Larsson	298	JavaScript (Node.js)	2020-06-23 11:45:19
4	Matheus Vieira	347	JavaScript (Node.js)	2019-03-15 21:24:08
5	Harsh Bhandari	357	JavaScript (Node.js)	2020-08-29 21:17:13
6	Khin Nyunt	378	JavaScript (Node.js)	2021-11-16 17:30:16
7	Gurpartap Singh Bhatti	381	JavaScript (Node.js)	2019-06-15 05:33:07
8	José Lucas	385	JavaScript (Node.js)	2019-03-15 19:50:27
9	Jaime López	394	JavaScript (Node.js)	2020-02-06 12:24:37
10	Nicolae Bumbu	405	JavaScript (Node.js)	2020-01-16 13:58:19

#	User	Length	Language	Date
1	Jimmy Gustafsson	41	JavaScript (SpiderMonkey)	2024-06-17 23:52:07
2	Christian Cederquist	43	JavaScript (SpiderMonkey)	2022-11-10 23:25:37
3	Evan Magill	59	JavaScript (SpiderMonkey)	2024-04-20 20:52:42
4	Bjørn Chr. Soltvedt	69	JavaScript (SpiderMonkey)	2016-04-03 14:51:03
5	J M	73	JavaScript (SpiderMonkey)	2016-11-12 16:23:02
6	Peter Menyes	73	JavaScript (SpiderMonkey)	2017-08-08 19:34:08
7	Peter Kedemo	75	JavaScript (SpiderMonkey)	2016-04-10 21:57:49
8	Robin Livesey	89	JavaScript (SpiderMonkey)	2018-04-16 10:56:46
9	Casey Smith	91	JavaScript (SpiderMonkey)	2019-05-22 23:02:12
10	Fernando Dettoni	108	JavaScript (SpiderMonkey)	2016-10-18 20:21:23

#	User	Length	Language	Date
1	Danny Robinson	41	Julia	2023-09-26 10:52:58
2	Timothy Gaede	185	Julia	2024-03-25 06:23:24

#	User	Length	Language	Date
1	Albert Pala	115	Kotlin	2021-07-12 14:24:05
2	axl	123	Kotlin	2019-08-05 14:28:28
3	Karl Johan Heimark	143	Kotlin	2024-05-23 20:14:31
4	Clinton Walker	157	Kotlin	2020-02-27 05:47:34
5	Dmitry Shostak	158	Kotlin	2019-08-18 18:10:25
6	Hidden user	166	Kotlin	2019-11-14 21:47:09
7	Jacob Huebner	166	Kotlin	2020-06-25 02:33:18
8	Troy Warmboe	173	Kotlin	2020-02-09 00:24:53
9	Dayan Ruben Gonzalez	228	Kotlin	2020-09-27 22:26:27
10	Adam Rankin	248	Kotlin	2023-04-22 02:30:37

#	User	Length	Language	Date
1	Zeheng Li	81	Lua	2023-12-13 00:28:32

#	User	Length	Language	Date
1	Rafael Rivas	311	Objective-C	2018-01-03 10:10:53

#	User	Length	Language	Date
1	Runze Wang	117	OCaml	2020-09-26 17:17:15
2	Jinwoo Lee	167	OCaml	2022-11-26 03:21:19

#	User	Length	Language	Date
1	Hidden user	398	Odin	2025-05-24 23:32:44

#	User	Length	Language	Date
1	Egor Shchetinin	152	Pascal	2018-01-22 16:13:27
2	Vova Podkorytov	157	Pascal	2018-01-22 16:12:10
3	Vitas	201	Pascal	2019-12-26 14:57:45
4	David Connolly	210	Pascal	2017-08-18 17:34:07

#	User	Length	Language	Date
1	Thomas Feld	28	PHP	2023-01-31 13:28:22
2	Renate	117	PHP	2021-07-17 22:43:12
3	Steven D. Wilson	147	PHP	2016-11-17 02:47:00
4	Petr Trofimov	228	PHP	2021-04-24 12:16:28
5	Rodrigo Erazo Hermosilla	311	PHP	2020-11-21 05:44:07
6	Andre Wahyudi	387	PHP	2022-12-12 09:21:06

#	User	Length	Language	Date
1	Hakan Kjellerstrand	54	Prolog	2023-03-04 22:17:52
2	Andriy Zyevakov	94	Prolog	2018-08-27 19:23:00
3	Hadi Qovaizi	2949	Prolog	2016-04-17 20:48:15

#	User	Length	Language	Date
1	Garðar Ingvarsson	69	Python 2	2019-01-10 05:38:14
2	Andreas Eisele	70	Python 2	2018-09-28 21:14:24
3	Johan Wind	74	Python 2	2017-06-04 00:49:47
4	Mathis Hammel	79	Python 2	2017-03-02 17:59:17
5	Hasan Ramezani	82	Python 2	2016-07-16 21:35:10
6	Muzakhir Amanzholov	82	Python 2	2017-01-27 01:01:08
7	Jeff Robertson	82	Python 2	2017-05-16 18:26:25
8	Ethan Arnold	85	Python 2	2017-02-13 23:13:59
9	Eoin Davey	87	Python 2	2017-09-08 21:14:47
10	Knut Anders Stokke	89	Python 2	2017-04-17 16:09:02

#	User	Length	Language	Date
1	Clement Oh	45	Python 3	2023-05-24 15:49:07
2	Tam Keng Hong	46	Python 3	2023-01-05 05:27:47
3	Błażej Dariusz Roszkowski	51	Python 3	2022-12-03 18:38:54
4	Leopold Hermansson	52	Python 3	2020-09-19 14:24:22
5	Hugo Morvan	52	Python 3	2023-03-03 19:35:25
6	Frans Meulenbroeks	52	Python 3	2024-09-27 00:26:03
7	Charles Ancheta	54	Python 3	2023-03-28 07:57:38
8	Karen Birgitta Hanssen	54	Python 3	2023-12-14 17:32:05
9	Dagur Máni Guðmundsson	55	Python 3	2023-11-23 13:12:08
10	Hannes Kristján Hannesson	56	Python 3	2016-06-19 21:27:14

#	User	Length	Language	Date
1	Thomas Feld	29	Ruby	2022-11-08 12:58:05
2	Gustav Elmqvist	29	Ruby	2023-03-28 19:29:15
3	Christian Cederquist	33	Ruby	2022-11-10 23:28:08
4	Ian Steiner	33	Ruby	2024-08-12 20:16:51
5	Alexander Bilde Pedersen	36	Ruby	2023-06-02 16:22:56
6	Jesper Bech Christensen	39	Ruby	2022-10-27 12:02:32
7	Clement Oh	46	Ruby	2024-03-15 12:45:46
8	Hidden user	51	Ruby	2018-10-11 19:36:25
9	Hidden user	51	Ruby	2019-02-16 20:46:40
10	Kellen Watt	52	Ruby	2018-11-24 06:21:51

#	User	Length	Language	Date
1	Vincent Lagerros	206	Rust	2025-03-10 00:04:44
2	Emil Dichmann	216	Rust	2025-09-16 10:22:25
3	Kok Dith	251	Rust	2021-08-06 05:54:54
4	Thomas	253	Rust	2023-06-02 22:54:38
5	Robert Janczewski	263	Rust	2020-02-11 16:39:59
6	Jonas van der Schaaf	267	Rust	2020-02-27 22:02:45
7	Bas Dirks	269	Rust	2022-01-01 23:53:26
8	Hidden user	271	Rust	2018-11-05 21:11:44
9	David Zacek	289	Rust	2021-05-30 21:01:02
10	Hidden user	292	Rust	2020-01-04 22:38:38

Solution running time distribution