Problem A
Buka — Problem Statistics

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Submissions	3490
Accepted submissions	1602
Submission ratio	45.90%
Authors	1521
Full solves [?]	1361
Full solve Ratio	89.48%

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-09-06 16:03:50
2	Chenzhang Hu	0.01 s	Bash	2023-09-14 16:21:54
3	Thomas Feld	0.01 s	Bash	2023-09-18 08:51:23

#	User	Runtime	Language	Date
1	Valentk777	0.02 s	C#	2020-10-31 11:52:28
2	Artur Niewiadomski	0.02 s	C#	2020-11-13 16:56:49
3	Thomas Norris	0.02 s	C#	2020-11-15 17:14:32
4	Mikael Fiala-Lundström	0.02 s	C#	2021-04-14 23:30:51
5	Jesper Lundin	0.02 s	C#	2021-11-04 23:04:10
6	Göran Andersson	0.02 s	C#	2022-05-17 19:19:06
7	Frian Tampake	0.02 s	C#	2022-12-23 07:34:19
8	Ruslan Starovoitov	0.03 s	C#	2020-10-31 11:16:18
9	Hidden user	0.03 s	C#	2020-10-31 11:22:53
10	Anders Parsberg Wagner	0.03 s	C#	2020-11-03 13:13:40

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.03 s	F#	2022-09-28 19:02:54
2	Hidden user	0.04 s	F#	2020-10-31 12:13:47

#	User	Runtime	Language	Date
1	Ivan Tserakh	0.08 s	Go	2020-10-31 11:20:58
2	Martynas Budriūnas	0.08 s	Go	2020-11-06 19:21:35
3	Magix	0.08 s	Go	2020-12-12 09:15:18
4	Norbert Voelker	0.08 s	Go	2021-04-26 23:21:35
5	Resa Renaldy	0.08 s	Go	2021-07-22 05:33:53
6	Tony Huynh	0.08 s	Go	2022-01-13 01:44:04

#	User	Runtime	Language	Date
1	Rudy Matela	0.00 s	Haskell	2023-09-16 11:51:53
2	Jørn Lode	0.01 s	Haskell	2020-10-31 11:10:10
3	Steinar Simonnes	0.01 s	Haskell	2020-10-31 11:11:24
4	Klas af Geijerstam	0.01 s	Haskell	2020-10-31 16:12:59
5	Brent Yorgey	0.01 s	Haskell	2020-10-31 20:20:34
6	Hidden user	0.01 s	Haskell	2020-11-06 13:13:27
7	Jan Hrček	0.01 s	Haskell	2020-11-07 14:42:50
8	Alessandro Bruni	0.01 s	Haskell	2020-11-13 16:12:58
9	Emil Østergaard	0.01 s	Haskell	2020-11-13 19:18:51
10	Tjocksii	0.01 s	Haskell	2020-11-14 21:11:40

#	User	Runtime	Language	Date
1	Guangyi Zhou	0.04 s	Java	2025-02-06 19:54:48
2	Mohammad Naufal Hazim Bin Saharudin	0.04 s	Java	2025-05-23 14:54:10
3	Ku Brian	0.05 s	Java	2024-05-16 05:11:02
4	Mathias Fink	0.06 s	Java	2020-10-31 11:05:44
5	Santosh Mahato	0.06 s	Java	2020-10-31 11:26:21
6	Simon Kristiansen	0.06 s	Java	2020-11-01 02:41:15
7	Desireé af Geijerstam	0.06 s	Java	2020-11-01 18:32:23
8	Crystal Sharpe	0.06 s	Java	2020-11-02 05:25:53
9	Nadja Brix Koch	0.06 s	Java	2020-11-03 01:13:35
10	Steven Cheng	0.06 s	Java	2020-11-07 00:52:19

#	User	Runtime	Language	Date
1	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-11-14 01:41:53
2	Peter Kedemo	0.42 s	JavaScript (Node.js)	2020-12-26 00:04:45
3	Linus Ekblom	0.42 s	JavaScript (Node.js)	2021-01-30 01:02:55
4	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-03-05 08:25:33
5	Chris Wong	0.42 s	JavaScript (Node.js)	2021-03-07 22:58:28
6	Daniel Liland	0.42 s	JavaScript (Node.js)	2022-01-27 00:58:39
7	Bas Dirks	0.42 s	JavaScript (Node.js)	2022-02-01 10:57:15

#	User	Runtime	Language	Date
1	Peter Menyes	0.02 s	JavaScript (SpiderMonkey)	2021-09-23 15:31:42
2	Zach Tschetter	0.02 s	JavaScript (SpiderMonkey)	2023-06-15 00:36:06
3	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2024-06-26 18:56:24
4	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-07-27 00:33:58

#	User	Runtime	Language	Date
1	Timothy Gaede	0.51 s	Julia	2024-04-10 10:50:33

#	User	Runtime	Language	Date
1	Roger Bongers	0.14 s	Kotlin	2021-06-27 03:32:16
2	Marit van Dijk	0.14 s	Kotlin	2021-09-17 13:02:44
3	Ola Sundell	0.14 s	Kotlin	2022-10-03 14:28:20
4	Troy Warmboe	0.16 s	Kotlin	2023-04-18 20:54:56
5	Adam Rankin	0.16 s	Kotlin	2023-05-08 23:29:05
6	Kristofer Sokk	0.17 s	Kotlin	2020-10-31 11:30:15
7	Frans-Lukas Lövenvald	0.18 s	Kotlin	2020-11-03 19:54:00
8	Magnus Wass	0.18 s	Kotlin	2020-12-21 22:54:52
9	Zaw Myat	0.18 s	Kotlin	2024-01-15 12:41:14
10	Martijn Muijsers	0.18 s	Kotlin	2024-05-31 22:17:48

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2021-01-26 07:29:26

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.00 s	Perl	2025-09-13 17:39:48
2	Thomas Feld	0.00 s	Perl	2025-09-15 15:57:57

#	User	Runtime	Language	Date
1	Susanne Ragnemalm	0.01 s	PHP	2024-03-30 21:10:25

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.02 s	Prolog	2022-12-21 08:45:11
2	Hakan Kjellerstrand	0.02 s	Prolog	2023-03-02 20:55:25

#	User	Runtime	Language	Date
1	Hasan Kalzi	0.02 s	Python 2	2022-06-17 16:12:52
2	Balamurugan M	0.02 s	Python 2	2023-07-04 16:43:07
3	Björn Magnusson	0.03 s	Python 2	2020-10-31 11:02:06
4	Andreas Björklund	0.03 s	Python 2	2020-10-31 11:03:29
5	Andrei Stoica	0.03 s	Python 2	2020-10-31 11:55:27
6	Yanmarshus Bachtiar	0.03 s	Python 2	2020-11-01 03:42:15
7	Shakeel Samsudeen	0.03 s	Python 2	2020-11-03 04:52:41
8	Johan Lyts	0.03 s	Python 2	2020-11-04 15:26:24
9	Thomas Feld	0.03 s	Python 2	2020-11-12 11:36:57
10	Lars Åström	0.03 s	Python 2	2020-11-14 13:12:43

#	User	Runtime	Language	Date
1	Peter Stauder	0.04 s	Python 3	2022-06-08 22:25:06
2	Joan Rose Paelden	0.04 s	Python 3	2022-06-09 07:32:18
3	Weiguo Jiang	0.04 s	Python 3	2022-06-10 01:00:33
4	Hasan Kalzi	0.04 s	Python 3	2022-06-17 16:11:33
5	Petr	0.04 s	Python 3	2022-06-19 12:08:18
6	arda atci	0.04 s	Python 3	2022-06-21 22:09:12
7	Josh Askin	0.04 s	Python 3	2022-07-08 09:06:17
8	Merih Bora Poçan	0.04 s	Python 3	2022-07-13 02:09:24
9	sathwik reddy	0.04 s	Python 3	2022-07-19 00:06:05
10	Hidden user	0.04 s	Python 3	2022-07-20 04:33:11

#	User	Runtime	Language	Date
1	Kok Dith	0.05 s	Ruby	2021-08-22 16:09:24
2	Gustav Elmqvist	0.05 s	Ruby	2023-03-05 21:53:20
3	Noah Hessen Bjerke	0.06 s	Ruby	2022-12-06 12:40:26
4	dick move	0.06 s	Ruby	2022-12-07 03:57:58
5	Thomas Feld	0.06 s	Ruby	2022-12-07 12:21:40
6	Julian Nohr	0.06 s	Ruby	2022-12-19 16:23:42
7	Christian Pilegaard Cederquist	0.06 s	Ruby	2023-01-12 23:54:51
8	Frederik Spang	0.06 s	Ruby	2023-02-04 12:43:05
9	Andreas Severin Hauch Trøstrup	0.06 s	Ruby	2023-02-12 14:07:11
10	Malte Nilsson	0.06 s	Ruby	2023-06-11 13:52:33

#	User	Runtime	Language	Date
1	Eskil Queseth	0.00 s	Rust	2020-10-31 14:04:31
2	Isak Jägberg	0.00 s	Rust	2021-01-04 19:00:55
3	Eric Pinter	0.00 s	Rust	2022-03-13 08:59:57
4	Freek van Keulen	0.00 s	Rust	2022-05-22 09:14:23
5	Henry Jacobson	0.00 s	Rust	2022-10-24 14:16:48
6	Vincent Lagerros	0.00 s	Rust	2024-07-26 01:41:52
7	Joshua Freudenhammer	0.00 s	Rust	2025-09-28 03:46:39

#	User	Length	Language	Date
1	Danny Robinson	10	Bash	2023-09-06 16:03:50
2	Chenzhang Hu	10	Bash	2023-09-14 16:21:54
3	Thomas Feld	10	Bash	2025-09-15 15:57:34

#	User	Length	Language	Date
1	Julian Duniec	662	C	2023-08-31 15:39:35
2	Jack Gurdin	688	C	2023-10-06 17:23:30
3	louis lin	716	C	2020-11-29 14:45:39
4	Jacob Sutton	768	C	2020-12-22 19:32:25
5	PhilCampbell	796	C	2021-01-13 12:54:24
6	Aron Bergman	960	C	2020-10-31 16:31:01
7	Matthew Hartono	960	C	2022-09-30 16:08:11
8	Benjamin Solomon	962	C	2024-09-10 18:45:53
9	HARITHA S R	987	C	2025-04-07 08:12:26
10	username	1025	C	2020-12-29 22:47:03

#	User	Length	Language	Date
1	Gregory Sinclair	219	C#	2023-12-05 03:43:08
2	Ali Aliev	355	C#	2021-12-27 12:52:34
3	Գոռ Բաղդասարյան	368	C#	2026-01-12 08:43:48
4	Anthony Ye	413	C#	2023-10-29 18:25:09
5	Hidden user	473	C#	2020-11-22 17:11:04
6	Lisa Linder	518	C#	2022-11-17 11:11:35
7	Christoffer Fredriksson	552	C#	2022-11-17 13:56:15
8	Sebastian Sternberg	556	C#	2021-01-30 19:03:44
9	Umar Rasyid	565	C#	2025-01-08 05:14:15
10	Anders Parsberg Wagner	613	C#	2020-11-03 13:13:40

#	User	Length	Language	Date
1	Frans Meulenbroeks	265	C++	2025-02-17 17:58:53
2	Tyler Fernando	305	C++	2022-11-01 07:28:44
3	Brad	362	C++	2022-06-14 17:11:05
4	Mohsen Mahroos	392	C++	2023-02-06 04:05:53
5	Ghada Bouzidi	393	C++	2020-10-31 11:38:34
6	Hidden user	406	C++	2020-12-02 10:36:12
7	Grae Yeandle	408	C++	2020-11-23 18:02:37
8	Hyunjun Lee	425	C++	2022-10-28 15:09:11
9	Faur Cristian Mugur	441	C++	2023-10-27 18:53:42
10	Vladyslav Reznikov	448	C++	2022-08-27 16:24:03

#	User	Length	Language	Date
1	Hidden user	543	F#	2020-10-31 12:13:47
2	Jacob Harris Cryer Kragh	585	F#	2022-09-28 19:02:54

#	User	Length	Language	Date
1	Martynas Budriūnas	266	Go	2020-11-06 19:21:35
2	Resa Renaldy	505	Go	2021-07-22 05:33:53
3	Tony Huynh	568	Go	2022-01-13 01:44:04
4	Norbert Voelker	599	Go	2021-04-26 23:21:35
5	Magix	980	Go	2020-12-12 09:15:18
6	Ivan Tserakh	1137	Go	2020-10-31 11:20:58

#	User	Length	Language	Date
1	Rudy Matela	86	Haskell	2023-09-16 11:51:53
2	Emil Østergaard	117	Haskell	2020-11-13 19:18:51
3	Zach Tschetter	133	Haskell	2021-09-25 19:50:12
4	Alessandro Bruni	138	Haskell	2020-11-13 16:12:58
5	Øyvind Almli	169	Haskell	2021-10-09 17:55:06
6	Isaac Arvestad	179	Haskell	2020-12-03 20:11:16
7	Steinar Simonnes	189	Haskell	2020-10-31 11:11:24
8	Hidden user	192	Haskell	2021-01-11 17:40:30
9	Hidden user	208	Haskell	2020-11-06 13:13:27
10	Klas af Geijerstam	211	Haskell	2020-10-31 16:12:59

#	User	Length	Language	Date
1	Rasmus Poulsen	317	Java	2024-01-31 14:20:30
2	Thanh Le	328	Java	2022-12-18 05:04:39
3	Jason Liu	342	Java	2023-05-01 15:50:43
4	Huy Le	376	Java	2022-12-17 05:36:58
5	Oghenetejiri Erhurun	397	Java	2024-10-21 18:07:17
6	Dennis Kaiser	412	Java	2022-10-25 14:27:21
7	TobiasZ	413	Java	2023-06-27 15:27:14
8	Amine Braham	421	Java	2021-12-01 22:16:33
9	Hugo Morvan	421	Java	2021-12-02 18:32:53
10	Felix	427	Java	2022-10-25 14:27:28

#	User	Length	Language	Date
1	Peter Kedemo	275	JavaScript (Node.js)	2020-12-26 00:04:45
2	Bas Dirks	412	JavaScript (Node.js)	2022-02-01 10:57:15
3	Howard Tin Chi Chan	468	JavaScript (Node.js)	2021-03-05 08:25:33
4	Daniel Liland	473	JavaScript (Node.js)	2022-01-27 00:58:39
5	Linus Ekblom	586	JavaScript (Node.js)	2021-01-30 01:02:55
6	Andoko Chandra	761	JavaScript (Node.js)	2020-11-14 01:41:53
7	Chris Wong	903	JavaScript (Node.js)	2021-03-07 22:58:28

#	User	Length	Language	Date
1	Zach Tschetter	105	JavaScript (SpiderMonkey)	2023-06-15 00:36:06
2	Bjørn Chr. Soltvedt	113	JavaScript (SpiderMonkey)	2024-06-26 18:56:24
3	Jimmy Gustafsson	191	JavaScript (SpiderMonkey)	2024-07-27 00:33:58
4	Peter Menyes	452	JavaScript (SpiderMonkey)	2021-09-23 15:31:42

#	User	Length	Language	Date
1	Timothy Gaede	456	Julia	2024-04-10 10:50:33

#	User	Length	Language	Date
1	Troy Warmboe	209	Kotlin	2023-04-18 20:54:56
2	Adam Rankin	267	Kotlin	2023-05-08 23:29:05
3	Marit van Dijk	305	Kotlin	2021-09-17 13:02:44
4	Chris Johnson	319	Kotlin	2023-09-05 05:23:49
5	Kristofer Sokk	372	Kotlin	2020-10-31 11:30:15
6	Martijn Muijsers	488	Kotlin	2024-05-31 22:17:48
7	Lewis Johnson	497	Kotlin	2023-09-05 13:20:02
8	Roger Bongers	511	Kotlin	2021-06-27 03:32:16
9	Ola Sundell	512	Kotlin	2022-10-03 14:28:20
10	Magnus Wass	533	Kotlin	2020-12-21 22:54:52

#	User	Length	Language	Date
1	Ingemar Ragnemalm	545	Pascal	2021-01-26 07:29:26

#	User	Length	Language	Date
1	Chenzhang Hu	6	Perl	2025-09-13 17:39:48
2	Thomas Feld	6	Perl	2025-09-15 15:57:57

#	User	Length	Language	Date
1	Susanne Ragnemalm	761	PHP	2024-03-30 21:10:25

#	User	Length	Language	Date
1	Hakan Kjellerstrand	74	Prolog	2023-03-15 18:51:13
2	Andriy Zyevakov	705	Prolog	2022-12-21 08:45:11

#	User	Length	Language	Date
1	Jakob Fridesjö	40	Python 2	2023-01-29 20:37:55
2	Shakeel Samsudeen	48	Python 2	2020-11-03 04:52:41
3	Nick Wu	61	Python 2	2022-03-14 22:31:09
4	Lars Åström	82	Python 2	2020-11-14 13:12:43
5	Johan Lyts	86	Python 2	2020-11-05 14:23:52
6	Björn Magnusson	90	Python 2	2020-10-31 11:02:06
7	Andreas Björklund	100	Python 2	2020-10-31 11:03:29
8	Thomas Feld	110	Python 2	2020-11-12 11:36:57
9	Sivasankaran D	121	Python 2	2026-01-09 10:16:27
10	Yanmarshus Bachtiar	140	Python 2	2020-11-01 03:42:15

#	User	Length	Language	Date
1	Hidden user	32	Python 3	2022-11-22 19:10:49
2	Karen Birgitta Hanssen	32	Python 3	2022-12-05 23:30:14
3	Noah Hessen Bjerke	32	Python 3	2022-12-06 07:58:06
4	Hidden user	32	Python 3	2022-12-09 23:19:34
5	Clement Oh	32	Python 3	2023-05-07 14:11:43
6	Logan Pipes	32	Python 3	2023-10-05 19:21:41
7	Joel Niemelä	32	Python 3	2025-05-31 08:07:22
8	David Aldenbro	32	Python 3	2025-08-26 22:38:05
9	Jason Clarke	35	Python 3	2024-01-18 11:26:30
10	Tim Poulsen	36	Python 3	2020-11-01 15:29:00

#	User	Length	Language	Date
1	Thomas Feld	17	Ruby	2023-04-24 15:36:22
2	Julian Nohr	18	Ruby	2022-12-19 16:28:18
3	dick move	19	Ruby	2022-12-07 03:57:58
4	Frederik Spang	21	Ruby	2023-02-05 16:43:56
5	Andreas Severin Hauch Trøstrup	21	Ruby	2023-02-12 15:20:51
6	Gustav Elmqvist	23	Ruby	2023-03-05 21:53:20
7	Noah Hessen Bjerke	24	Ruby	2022-12-06 12:48:15
8	Christian Pilegaard Cederquist	51	Ruby	2023-01-12 23:54:51
9	Malte Nilsson	98	Ruby	2023-06-11 13:52:33
10	Kok Dith	134	Ruby	2021-08-22 16:09:24

#	User	Length	Language	Date
1	Henry Jacobson	797	Rust	2022-10-24 15:02:15
2	Eskil Queseth	943	Rust	2020-10-31 14:04:31
3	Freek van Keulen	947	Rust	2022-05-22 09:14:23
4	Isak Jägberg	1146	Rust	2021-01-04 19:00:55
5	Joshua Freudenhammer	1193	Rust	2025-09-28 03:46:39
6	Eric Pinter	1592	Rust	2022-03-13 08:59:57
7	Vincent Lagerros	43247	Rust	2024-07-26 01:41:52

Solution running time distribution