Problem A
Prva — Problem Statistics

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Submissions	2941
Accepted submissions	1796
Submission ratio	61.07%
Authors	1689
Full solves [?]	1610
Full solve Ratio	95.32%

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-09-26 01:14:43

#	User	Runtime	Language	Date
1	Jens Mossig	0.02 s	C#	2017-02-12 13:56:30
2	Khin Nyunt	0.02 s	C#	2017-04-08 16:28:48
3	Ludwig Hedeby	0.02 s	C#	2017-12-01 13:34:58
4	Ólafur Andri	0.02 s	C#	2018-02-03 23:01:05
5	Kunwei Zhang	0.02 s	C#	2018-02-13 13:02:05
6	Alireza Nasrollahzadeh	0.02 s	C#	2018-07-11 19:45:43
7	Alex Telon	0.02 s	C#	2018-07-22 22:36:51
8	Eric Bäckhage	0.02 s	C#	2019-02-11 22:23:11
9	Ignacio Monllor	0.02 s	C#	2019-04-16 05:46:30
10	Goran Hrovat	0.02 s	C#	2019-04-22 21:14:51

#	User	Runtime	Language	Date
1	David Cawthon	0.02 s	Common Lisp	2019-04-17 03:51:51

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.05 s	F#	2022-07-17 10:16:22

#	User	Runtime	Language	Date
1	Nikolas Kolic	0.04 s	Java	2025-03-24 11:51:37
2	Isak Jägberg	0.05 s	Java	2016-11-18 14:33:23
3	Edvin Lundberg	0.05 s	Java	2016-11-18 14:41:59
4	Hidden user	0.05 s	Java	2016-11-18 14:46:04
5	Elias Andersson	0.05 s	Java	2016-11-18 14:46:06
6	Martijn Muijsers	0.05 s	Java	2016-11-24 22:40:37
7	Micah Stairs	0.05 s	Java	2016-11-25 16:36:20
8	Michel Langeveld	0.05 s	Java	2016-12-03 07:08:22
9	Finn Lidbetter	0.05 s	Java	2016-12-24 22:49:25
10	Viraj Maddur	0.05 s	Java	2017-01-27 18:28:33

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	JavaScript (Node.js)	2023-09-23 06:49:16
2	Taylor Allred	0.40 s	JavaScript (Node.js)	2019-09-28 01:07:25
3	Chris Wong	0.41 s	JavaScript (Node.js)	2021-02-19 23:27:46
4	John	0.42 s	JavaScript (Node.js)	2020-08-07 09:35:26
5	Khin Nyunt	0.42 s	JavaScript (Node.js)	2021-11-28 13:48:33
6	Andoko Chandra	0.43 s	JavaScript (Node.js)	2020-10-09 20:09:33

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-11-19 16:08:33
2	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2016-11-26 10:34:54
3	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-27 09:39:47
4	Nicklas Utgaard	0.01 s	JavaScript (SpiderMonkey)	2018-06-26 13:15:28
5	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-11 13:28:56
6	Zach Tschetter	0.02 s	JavaScript (SpiderMonkey)	2023-04-21 22:03:38
7	Evan Magill	0.02 s	JavaScript (SpiderMonkey)	2024-04-20 21:01:57
8	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-06-16 11:19:59

#	User	Runtime	Language	Date
1	Timothy Gaede	0.68 s	Julia	2024-03-26 00:41:02

#	User	Runtime	Language	Date
1	Jacob Huebner	0.14 s	Kotlin	2022-02-16 03:36:56
2	Adam Rankin	0.18 s	Kotlin	2023-05-08 18:49:20
3	Neil Harmon	0.19 s	Kotlin	2019-04-08 15:37:43
4	Dayan Ruben Gonzalez	0.19 s	Kotlin	2020-10-03 20:30:24
5	Hidden user	0.20 s	Kotlin	2017-12-10 06:11:34
6	Alexandre Conte	0.21 s	Kotlin	2021-09-13 00:47:33
7	Troy Warmboe	0.23 s	Kotlin	2020-02-07 21:42:21
8	Gaurav Tyagi	0.24 s	Kotlin	2018-08-09 18:25:34

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-05-26 04:04:02

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2017-10-12 21:34:05

#	User	Runtime	Language	Date
1	Silvena Lam	0.01 s	PHP	2018-02-27 12:45:04
2	Emil Riis Hansen	0.01 s	PHP	2018-10-30 14:54:30
3	Connor Billings	0.01 s	PHP	2020-01-03 05:43:32
4	Petr Trofimov	0.01 s	PHP	2021-05-01 13:15:05
5	Andre Wahyudi	0.01 s	PHP	2023-05-29 04:59:49
6	Renate	0.01 s	PHP	2024-04-10 22:18:42
7	Susanne Ragnemalm	0.01 s	PHP	2024-05-12 21:30:27

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.02 s	Prolog	2023-02-22 17:24:23
2	Hakan Kjellerstrand	0.03 s	Prolog	2023-02-11 11:15:40

#	User	Runtime	Language	Date
1	Miguel Alfageme Sanchez	0.02 s	Python 2	2017-02-05 04:13:51
2	Mathis Hammel	0.02 s	Python 2	2017-02-15 12:02:38
3	Andrei Stoica	0.02 s	Python 2	2017-11-29 21:00:06
4	Maksym Bendeberia	0.02 s	Python 2	2017-11-30 14:55:56
5	Alex Van Keulen	0.02 s	Python 2	2018-02-01 20:47:59
6	Johan Wind	0.02 s	Python 2	2018-03-17 17:39:51
7	Johann Ly	0.02 s	Python 2	2018-03-31 08:45:28
8	João Pedro Alvito	0.02 s	Python 2	2018-07-03 11:51:51
9	Nirenjan Krishnan	0.02 s	Python 2	2018-08-21 00:38:57
10	Christofer Ohlsson	0.03 s	Python 2	2016-11-18 15:22:11

#	User	Runtime	Language	Date
1	Emma Nimstad	0.02 s	Python 3	2016-11-18 13:42:36
2	André Danielsson	0.02 s	Python 3	2016-11-18 14:32:17
3	Milosz Wielondek	0.02 s	Python 3	2016-11-18 16:04:24
4	Davi Ajmaya	0.02 s	Python 3	2016-11-27 02:27:29
5	Wayne	0.02 s	Python 3	2016-12-17 06:07:00
6	Anthony Nguyen	0.02 s	Python 3	2016-12-27 02:15:59
7	Ada Clevinger	0.02 s	Python 3	2016-12-29 02:45:31
8	Nathan Collins	0.02 s	Python 3	2017-01-01 21:50:24
9	Dennis Svedberg	0.02 s	Python 3	2017-01-03 15:29:52
10	Lucia Pál (Simanová)	0.02 s	Python 3	2017-01-19 02:27:35

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.13 s	Racket	2025-01-26 20:59:57

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	Ruby	2020-05-28 10:23:52
2	Thomas Feld	0.06 s	Ruby	2022-11-25 12:28:14
3	Ian Steiner	0.06 s	Ruby	2024-08-08 22:11:48

#	User	Length	Language	Date
1	Danny Robinson	102	Bash	2023-09-26 01:14:43

#	User	Length	Language	Date
1	Martin Blom	305	C	2024-01-12 13:46:15
2	a_b__c	831	C	2021-02-04 09:39:01
3	Ximun Castoreo	932	C	2020-07-10 11:20:39
4	Matthew Weston	974	C	2022-01-12 17:26:29
5	Emil Wihlander	1014	C	2020-12-09 23:14:07
6	PhilCampbell	1060	C	2021-01-09 18:39:18
7	Eduardo Vicente Petry	1363	C	2025-08-20 22:42:55
8	Kali Miller	1368	C	2020-07-24 18:09:48
9	Lauren Washington	1368	C	2023-08-24 21:47:26
10	Jason Vu	1408	C	2022-08-31 23:23:36

#	User	Length	Language	Date
1	Gregory Sinclair	361	C#	2023-11-14 19:33:49
2	traxex	543	C#	2024-05-15 13:43:29
3	Esty Crow	763	C#	2024-01-28 00:25:51
4	Anthony Ye	887	C#	2024-01-28 20:20:02
5	李陆屿	995	C#	2019-04-26 11:41:55
6	Alireza Nasrollahzadeh	996	C#	2018-07-11 19:45:43
7	Simon Thillemann Nielsen	1029	C#	2025-11-20 01:07:26
8	Jens Erik	1030	C#	2025-11-20 01:07:06
9	Göran Andersson	1131	C#	2022-05-13 17:10:01
10	Ólafur Andri	1185	C#	2018-02-03 23:01:05

#	User	Length	Language	Date
1	Andrii Karhapoltsev	564	C++	2025-04-26 13:52:49
2	Hidden user	568	C++	2020-02-29 02:02:45
3	tarflah	652	C++	2016-12-16 11:22:29
4	Li Yao'an	652	C++	2017-02-12 09:39:05
5	William Gan	653	C++	2017-02-06 17:44:12
6	Hidden user	676	C++	2018-04-07 19:41:43
7	Frederick Pek	684	C++	2021-06-05 08:25:08
8	黃子恩	687	C++	2023-01-26 18:17:13
9	sngr	699	C++	2023-09-14 18:17:54
10	Yeung Man Tsung	700	C++	2023-01-16 13:18:01

#	User	Length	Language	Date
1	David Cawthon	1266	Common Lisp	2019-04-17 03:51:51

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	879	F#	2022-07-17 10:16:22

#	User	Length	Language	Date
1	Asmus Tørsleff	625	Go	2021-08-31 12:40:49
2	Bruno Martinovic	691	Go	2021-09-01 14:37:40
3	Gustav Holmgren	700	Go	2021-08-31 15:14:50
4	Frederik Bertelsen	701	Go	2023-08-30 13:44:12
5	Magnus Dalsgaard Larsen	721	Go	2021-08-31 15:02:38
6	jonaskjodt	732	Go	2023-08-29 21:11:53
7	Emil Østergaard	733	Go	2021-08-31 12:08:27
8	Karl Michelsen	779	Go	2021-08-31 13:49:35
9	Thor Lyster Lind	780	Go	2021-09-06 18:12:27
10	Rasmus Streubel Nielsen	810	Go	2024-08-27 21:03:58

#	User	Length	Language	Date
1	Sebastian Paaske Tørholm	325	Haskell	2022-12-25 22:48:03
2	Aurélien Pepin	336	Haskell	2019-09-01 11:23:41
3	Sebastian Banert	362	Haskell	2024-06-12 20:21:51
4	Brandon Tang	367	Haskell	2023-06-12 18:11:36
5	Hidden user	399	Haskell	2019-08-14 13:21:36
6	Jan Hlavacek	405	Haskell	2016-12-28 14:27:09
7	Ola Berglund	421	Haskell	2024-11-17 22:26:00
8	Brent Yorgey	437	Haskell	2017-10-12 18:31:14
9	John Grzechowiak	450	Haskell	2017-03-25 18:48:20
10	Jan Hrček	457	Haskell	2020-10-31 15:26:17

#	User	Length	Language	Date
1	Mark Anthony Sumpay	734	Java	2017-11-11 17:25:45
2	Doug Goodman	780	Java	2018-04-08 18:59:56
3	Austin Girouard	841	Java	2019-03-10 20:26:17
4	Stein Gate	861	Java	2018-08-03 10:34:55
5	Samuel Klingström	869	Java	2017-03-04 01:09:58
6	Kyar Nyo Aye	915	Java	2018-03-23 17:52:13
7	Ayoub El Yaquine	928	Java	2016-12-24 20:33:51
8	Pedro Contipelli	939	Java	2016-12-22 17:42:23
9	Anand Iyer	949	Java	2019-01-21 03:56:00
10	Thomas King	949	Java	2020-07-17 01:28:26

#	User	Length	Language	Date
1	Taylor Allred	754	JavaScript (Node.js)	2019-09-28 01:07:25
2	Chris Wong	794	JavaScript (Node.js)	2021-02-19 23:27:46
3	John	1187	JavaScript (Node.js)	2020-08-07 09:35:26
4	Hidden user	1241	JavaScript (Node.js)	2023-09-23 06:49:16
5	Andoko Chandra	1788	JavaScript (Node.js)	2020-10-09 20:09:33
6	Khin Nyunt	2332	JavaScript (Node.js)	2021-11-28 13:48:33

#	User	Length	Language	Date
1	Jimmy Gustafsson	290	JavaScript (SpiderMonkey)	2024-06-16 11:19:59
2	Zach Tschetter	316	JavaScript (SpiderMonkey)	2023-04-21 22:03:38
3	Peter Kedemo	439	JavaScript (SpiderMonkey)	2016-11-26 10:34:54
4	Christian Pilegaard Cederquist	479	JavaScript (SpiderMonkey)	2023-01-11 13:28:56
5	Bjørn Chr. Soltvedt	728	JavaScript (SpiderMonkey)	2016-11-19 16:08:33
6	Peter Menyes	742	JavaScript (SpiderMonkey)	2017-08-27 09:39:47
7	Evan Magill	753	JavaScript (SpiderMonkey)	2024-04-20 21:01:57
8	Nicklas Utgaard	1073	JavaScript (SpiderMonkey)	2018-06-26 13:15:28

#	User	Length	Language	Date
1	Timothy Gaede	2437	Julia	2024-03-26 00:21:59

#	User	Length	Language	Date
1	Hidden user	548	Kotlin	2017-12-10 06:11:34
2	Dayan Ruben Gonzalez	714	Kotlin	2020-10-03 20:30:24
3	Jacob Huebner	937	Kotlin	2022-02-16 03:36:56
4	Adam Rankin	1071	Kotlin	2023-05-08 18:49:20
5	Gaurav Tyagi	1360	Kotlin	2018-08-09 18:25:34
6	Alexandre Conte	1403	Kotlin	2021-09-13 00:47:33
7	Troy Warmboe	1430	Kotlin	2020-02-07 21:42:21
8	Neil Harmon	2489	Kotlin	2019-04-08 15:37:43

#	User	Length	Language	Date
1	Hidden user	1655	Odin	2025-05-26 04:04:02

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1401	Pascal	2017-10-12 21:34:05

#	User	Length	Language	Date
1	Renate	722	PHP	2024-04-10 22:18:42
2	Connor Billings	761	PHP	2020-01-03 05:43:32
3	Petr Trofimov	785	PHP	2021-05-01 13:15:05
4	Silvena Lam	960	PHP	2018-02-27 12:45:04
5	Susanne Ragnemalm	990	PHP	2024-05-12 21:30:27
6	Andre Wahyudi	1034	PHP	2023-05-29 04:59:49
7	Emil Riis Hansen	1126	PHP	2018-10-30 14:54:30

#	User	Length	Language	Date
1	Hakan Kjellerstrand	444	Prolog	2023-02-11 11:15:40
2	Andriy Zyevakov	2376	Prolog	2023-02-22 17:24:23

#	User	Length	Language	Date
1	Thomas Feld	167	Python 2	2019-08-30 09:44:43
2	Kuan Wei Heng	171	Python 2	2018-12-22 02:49:28
3	KALAJAYANTHI M	215	Python 2	2025-10-04 18:48:55
4	Maksym Bendeberia	320	Python 2	2017-11-30 14:55:56
5	Christofer Ohlsson	352	Python 2	2016-11-18 15:22:11
6	Johan Wind	356	Python 2	2018-03-17 17:39:51
7	João Pedro Alvito	390	Python 2	2018-07-03 11:51:51
8	Johann Ly	409	Python 2	2018-03-31 08:45:28
9	Johan Lyts	432	Python 2	2019-06-07 21:55:39
10	Giorgos Trogadas	433	Python 2	2019-03-06 17:51:53

#	User	Length	Language	Date
1	Kevin Gomez	102	Python 3	2024-06-12 05:38:15
2	Clement Oh	180	Python 3	2023-09-17 07:34:45
3	David Worley	187	Python 3	2025-11-07 15:10:55
4	Benjamin Z White	189	Python 3	2023-04-21 23:23:29
5	Kjeld Janke Lück	189	Python 3	2024-10-08 06:45:08
6	Tai Tze Kin	206	Python 3	2024-05-01 20:57:39
7	Vedran Čačić	207	Python 3	2019-01-19 10:29:08
8	Hrant Hovhannisyan	212	Python 3	2025-10-14 10:27:31
9	Gerth Stølting Brodal	219	Python 3	2020-02-07 15:52:51
10	Si Jie Tan	219	Python 3	2026-01-09 14:34:30

#	User	Length	Language	Date
1	Jinwoo Lee	1388	Racket	2025-01-26 21:03:06

#	User	Length	Language	Date
1	Thomas Feld	75	Ruby	2023-01-11 08:48:18
2	Hidden user	136	Ruby	2020-05-28 12:11:52
3	Ian Steiner	1135	Ruby	2024-08-08 22:21:53

#	User	Length	Language	Date
1	Emil Dichmann	643	Rust	2025-09-16 10:32:15
2	Pankajkumar Patro	979	Rust	2024-11-22 15:35:44
3	Kok Dith	1101	Rust	2021-08-15 05:43:12
4	Vincent Lagerros	1151	Rust	2025-02-05 13:03:48
5	Morten Raeburn	1237	Rust	2021-11-14 01:13:14
6	Bas Dirks	1373	Rust	2022-01-03 10:15:30
7	Tobias Nilsson	1398	Rust	2021-01-24 14:26:50
8	Alex G	1558	Rust	2020-03-05 23:40:10
9	Joel Niemelä	1704	Rust	2019-04-28 13:33:53
10	David Zacek	1775	Rust	2021-06-01 17:07:06

Solution running time distribution