Problem A
Perket — Problem Statistics

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Submissions	2488
Accepted submissions	1300
Submission ratio	52.25%
Authors	1189
Full solves [?]	1088
Full solve Ratio	91.51%

#	User	Runtime	Language	Date
1	Андрей Титов	0.02 s	C#	2016-01-27 09:03:12
2	Robert Low	0.02 s	C#	2016-07-25 14:12:21
3	Duelene Olson	0.02 s	C#	2017-05-02 22:17:29
4	Faisal Rahman	0.02 s	C#	2018-05-22 05:49:45
5	Henrik Hallbert	0.02 s	C#	2020-02-01 15:15:22
6	Yousef Almutairi	0.02 s	C#	2020-09-14 22:13:54
7	Marcus Elg	0.02 s	C#	2020-10-30 10:03:33
8	Ali Aliev	0.02 s	C#	2022-01-04 15:10:02
9	Jonathan Ibrahim	0.03 s	C#	2020-12-05 14:38:46
10	Hidden user	0.03 s	C#	2021-01-12 16:43:01

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.04 s	F#	2023-01-16 18:31:45

#	User	Runtime	Language	Date
1	Hidden user	0.08 s	Go	2016-05-27 18:37:17
2	Hidden user	0.08 s	Go	2021-04-05 05:26:51
3	Norbert Voelker	0.08 s	Go	2021-07-06 20:10:15

#	User	Runtime	Language	Date
1	Oskar Segersvärd	0.00 s	Haskell	2014-12-14 20:41:07
2	Hidden user	0.00 s	Haskell	2014-12-22 16:51:35
3	Hidden user	0.00 s	Haskell	2015-02-21 12:03:42
4	Carl Agrell	0.00 s	Haskell	2016-09-22 20:14:31
5	Johan Meier	0.00 s	Haskell	2016-12-28 23:29:44
6	Blake Hyde	0.00 s	Haskell	2017-08-21 23:40:44
7	Brent Yorgey	0.00 s	Haskell	2017-10-24 12:44:08
8	Intrets	0.00 s	Haskell	2019-12-02 16:32:11
9	Mason Barnhill	0.00 s	Haskell	2023-08-30 03:52:10
10	Aurélien Pepin	0.01 s	Haskell	2019-09-20 08:38:03

#	User	Runtime	Language	Date
1	Ranjith M	0.04 s	Java	2025-01-07 04:51:06
2	leo wennberg	0.04 s	Java	2025-08-06 21:04:19
3	Simon Klein	0.05 s	Java	2013-04-23 13:29:17
4	Carl Henrik Klåvus	0.05 s	Java	2013-04-23 14:35:57
5	Jens Ståhl	0.05 s	Java	2014-05-09 16:39:55
6	Kai Widell Niigata	0.05 s	Java	2014-05-12 22:20:34
7	Jonas Haglund	0.05 s	Java	2014-06-06 15:48:37
8	Alexander Gomez	0.05 s	Java	2014-12-17 00:36:47
9	Henrik Sandström	0.05 s	Java	2015-01-24 01:56:10
10	Dennis Ang	0.05 s	Java	2015-10-02 03:57:31

#	User	Runtime	Language	Date
1	Vu Le	0.43 s	JavaScript (Node.js)	2021-10-23 23:00:39

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	JavaScript (SpiderMonkey)	2014-12-11 18:33:44
2	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-29 20:05:01
3	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-27 15:49:34
4	Christian Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-03-19 18:03:26
5	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-08-22 18:12:47
6	Hidden user	0.31 s	JavaScript (SpiderMonkey)	2014-12-12 22:28:16

#	User	Runtime	Language	Date
1	Noszály Csaba	0.47 s	Julia	2025-03-02 21:38:05
2	Timothy Gaede	0.60 s	Julia	2024-04-17 07:28:02

#	User	Runtime	Language	Date
1	Adam Rankin	0.18 s	Kotlin	2023-05-10 04:34:28
2	Dayan Ruben Gonzalez	0.19 s	Kotlin	2020-10-08 07:10:16
3	Neil Harmon	0.20 s	Kotlin	2019-07-08 16:08:56
4	Isaac Owomugisha	0.21 s	Kotlin	2020-09-06 20:44:24

#	User	Runtime	Language	Date
1	Óðinn Ágústsson	0.01 s	Lua	2025-01-31 12:49:57

#	User	Runtime	Language	Date
1	Nguyen Hoang Trung	0.00 s	Pascal	2017-06-21 16:46:11
2	Ingemar Ragnemalm	0.00 s	Pascal	2020-01-04 10:23:53

#	User	Runtime	Language	Date
1	Paulo Bu	0.03 s	Python 2	2015-03-20 09:44:17
2	Erik Odenman	0.03 s	Python 2	2015-05-15 01:44:33
3	Christofer Ohlsson	0.03 s	Python 2	2015-06-30 14:17:31
4	Johannes Agestam	0.03 s	Python 2	2015-08-20 10:01:25
5	Samo Ilc	0.03 s	Python 2	2015-08-28 07:25:28
6	Choo Jia Le	0.03 s	Python 2	2016-01-14 04:23:23
7	Erik Sillén	0.03 s	Python 2	2016-07-22 00:26:36
8	Daniel Strizhevsky	0.03 s	Python 2	2016-09-23 22:25:40
9	Benjamin Nichols	0.03 s	Python 2	2016-09-23 22:29:51
10	Issam Baskati	0.03 s	Python 2	2016-12-15 01:55:07

#	User	Runtime	Language	Date
1	Alexandre Loiko	0.02 s	Python 3	2013-04-23 13:43:17
2	Mattis Kancans Envall	0.02 s	Python 3	2015-01-16 15:03:07
3	Brian Harrington	0.02 s	Python 3	2015-04-19 05:36:51
4	James Elías Sigurðarson	0.02 s	Python 3	2015-06-03 15:52:48
5	Johannes Agestam	0.02 s	Python 3	2015-08-20 10:00:38
6	Jeremy Tuloup	0.02 s	Python 3	2015-11-19 18:55:52
7	Gregor Vavdi	0.02 s	Python 3	2016-02-14 14:09:25
8	Wayne	0.02 s	Python 3	2016-02-14 21:19:59
9	Chris Kwiatkowski	0.02 s	Python 3	2016-03-03 03:51:24
10	Max Li	0.02 s	Python 3	2016-03-03 23:46:19

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-03-03 22:15:06
2	Thomas Feld	0.06 s	Ruby	2023-08-21 10:28:13

#	User	Runtime	Language	Date
1	Pahlevi Fikri Auliya	0.00 s	Rust	2021-02-27 22:54:45
2	Jonathan Jiang	0.00 s	Rust	2021-04-10 06:41:44
3	Isak Jägberg	0.00 s	Rust	2021-05-06 17:30:14
4	Bas Dirks	0.00 s	Rust	2022-05-02 17:18:10
5	Vincent Lagerros	0.00 s	Rust	2025-06-11 00:57:41
6	Eric Källman	0.00 s	Rust	2025-08-05 23:30:30

#	User	Length	Language	Date
1	Hidden user	509	C	2014-11-16 16:26:04
2	Hidden user	571	C	2017-11-17 22:01:11
3	Nick Reczek	653	C	2020-09-16 12:19:25
4	Hidden user	704	C	2025-01-18 16:56:47
5	Margaret Polley	739	C	2020-09-15 02:38:52
6	Anirudh Edupuganti	780	C	2020-09-16 22:52:01
7	Ng Wei Jie	788	C	2020-02-18 15:54:14
8	Noah Ó Donnaile	789	C	2018-08-22 21:20:06
9	Naveen Kumar S	811	C	2025-04-11 15:42:38
10	Jón Steinn Elíasson	837	C	2017-07-05 22:24:52

#	User	Length	Language	Date
1	Michael Damsgaard	1086	C#	2024-12-08 07:52:18
2	Göran Andersson	1151	C#	2022-05-30 01:01:01
3	Matthew Drain	1389	C#	2024-10-07 17:04:39
4	Ali Aliev	1551	C#	2022-01-04 15:10:02
5	Marcus Elg	1573	C#	2020-10-30 10:03:33
6	Henrik Hallbert	1677	C#	2020-02-01 15:15:22
7	Robert Low	1978	C#	2016-07-25 14:12:21
8	Faisal Rahman	2137	C#	2018-05-22 05:49:45
9	masosz	2634	C#	2015-03-02 22:08:06
10	Hidden user	2651	C#	2021-01-12 16:43:01

#	User	Length	Language	Date
1	Frans Meulenbroeks	240	C++	2025-02-17 16:28:43
2	Antonio Molina Lovett	318	C++	2016-08-10 10:05:21
3	William Gan	354	C++	2017-01-25 15:39:20
4	syy	371	C++	2020-01-20 13:39:54
5	Way Tan	372	C++	2019-01-13 16:07:14
6	Brandon Zhang	373	C++	2020-05-12 21:24:24
7	Herman Karlsson	375	C++	2015-05-23 09:56:11
8	Julian Neeleman	391	C++	2017-05-16 17:00:37
9	Sarji Elijah See Bona	401	C++	2024-09-24 17:02:20
10	พุฒิเศรษฐ์ him him him	417	C++	2024-01-09 08:05:51

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1139	F#	2023-01-16 18:31:45

#	User	Length	Language	Date
1	Hidden user	576	Go	2021-04-05 05:26:51
2	Hidden user	746	Go	2016-05-27 18:37:17
3	Norbert Voelker	961	Go	2021-07-06 20:10:15

#	User	Length	Language	Date
1	Intrets	422	Haskell	2019-12-02 16:40:35
2	Aurélien Pepin	424	Haskell	2019-09-20 08:38:03
3	Carl Agrell	437	Haskell	2016-09-22 20:14:31
4	Mason Barnhill	448	Haskell	2023-08-30 03:52:10
5	Hidden user	559	Haskell	2014-12-22 16:51:35
6	Jan Hrček	593	Haskell	2021-04-10 19:11:07
7	Johan Meier	610	Haskell	2016-12-28 23:29:44
8	Steinar Simonnes	755	Haskell	2024-05-23 17:56:17
9	Brent Yorgey	789	Haskell	2017-10-24 12:44:08
10	Abel Martin	868	Haskell	2019-09-23 23:37:44

#	User	Length	Language	Date
1	Doug Goodman	583	Java	2018-03-15 22:24:10
2	Tienanh Nguyen	584	Java	2016-09-21 02:42:57
3	Kiên Nguyễn Tiến Trung	639	Java	2017-01-29 13:58:40
4	Marcus Der	694	Java	2020-11-02 03:08:53
5	John Ladera	722	Java	2020-07-14 02:56:23
6	Yacoub Seyni	723	Java	2015-09-27 03:53:53
7	Abigail grace	740	Java	2020-12-07 19:57:37
8	Hidden user	746	Java	2020-09-15 05:01:02
9	Liang Gao	756	Java	2020-09-14 19:23:32
10	Elias Moons	774	Java	2015-08-16 21:07:27

#	User	Length	Language	Date
1	Vu Le	1148	JavaScript (Node.js)	2021-10-23 23:00:39

#	User	Length	Language	Date
1	Jimmy Gustafsson	247	JavaScript (SpiderMonkey)	2024-08-22 18:12:47
2	Christian Cederquist	590	JavaScript (SpiderMonkey)	2023-03-19 18:03:26
3	Peter Kedemo	597	JavaScript (SpiderMonkey)	2015-12-29 20:05:01
4	Hidden user	609	JavaScript (SpiderMonkey)	2014-12-11 18:33:44
5	Hidden user	1136	JavaScript (SpiderMonkey)	2014-12-12 22:28:16
6	Bjørn Chr. Soltvedt	1624	JavaScript (SpiderMonkey)	2016-02-27 15:49:34

#	User	Length	Language	Date
1	Noszály Csaba	208	Julia	2025-03-02 21:53:07
2	Timothy Gaede	1053	Julia	2024-04-17 07:28:02

#	User	Length	Language	Date
1	Dayan Ruben Gonzalez	624	Kotlin	2020-10-08 07:10:16
2	Isaac Owomugisha	1452	Kotlin	2020-09-06 20:44:24
3	Adam Rankin	1467	Kotlin	2023-05-10 04:34:28
4	Neil Harmon	1642	Kotlin	2019-07-08 16:08:56

#	User	Length	Language	Date
1	Óðinn Ágústsson	975	Lua	2025-01-31 12:49:57

#	User	Length	Language	Date
1	Nguyen Hoang Trung	708	Pascal	2017-06-21 16:46:11
2	Ingemar Ragnemalm	813	Pascal	2020-01-04 10:23:53

#	User	Length	Language	Date
1	Thomas Feld	251	Python 2	2019-10-24 13:18:55
2	Erik Odenman	266	Python 2	2015-05-15 01:44:33
3	Andreas Björklund	270	Python 2	2019-09-30 21:53:31
4	Jesper Öqvist	303	Python 2	2018-10-27 22:18:26
5	Johannes Agestam	368	Python 2	2015-08-20 10:02:22
6	Justin Su	368	Python 2	2017-09-25 13:29:51
7	Johan Lyts	395	Python 2	2019-08-19 14:16:54
8	Paulo Bu	409	Python 2	2015-03-20 09:44:17
9	Daniel Strizhevsky	416	Python 2	2016-09-23 22:25:40
10	Shakeel Samsudeen	417	Python 2	2020-07-13 21:34:14

#	User	Length	Language	Date
1	Benjamin Z White	192	Python 3	2023-04-19 18:54:27
2	Ahmed Chamseddine	257	Python 3	2024-08-15 17:33:54
3	Clement Oh	273	Python 3	2023-09-19 09:30:09
4	Yong Mao	278	Python 3	2023-07-03 00:48:36
5	Seyed Mohammad Seyedi	285	Python 3	2025-05-22 16:10:52
6	Tobias Bessler	292	Python 3	2024-08-25 01:01:26
7	James Elías Sigurðarson	295	Python 3	2015-06-03 15:52:48
8	Tai Tze Kin	297	Python 3	2024-01-29 13:06:45
9	Sander Oppen	299	Python 3	2024-12-09 23:42:02
10	Thibault Raffaillac	307	Python 3	2024-08-02 15:55:37

#	User	Length	Language	Date
1	Thomas Feld	122	Ruby	2023-08-21 10:32:14
2	Casper Christensen	321	Ruby	2016-03-03 22:15:06

#	User	Length	Language	Date
1	Vincent Lagerros	850	Rust	2025-06-11 00:57:41
2	Eric Källman	1244	Rust	2025-08-05 23:30:30
3	Jonathan Jiang	1314	Rust	2021-04-10 06:41:44
4	Bas Dirks	1387	Rust	2022-05-02 17:18:10
5	Pahlevi Fikri Auliya	2290	Rust	2021-02-27 22:54:45
6	Isak Jägberg	2408	Rust	2021-05-06 17:30:14

Solution running time distribution