Problem A
Peragrams — Problem Statistics

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Submissions	11402
Accepted submissions	5206
Submission ratio	45.66%
Authors	3551
Full solves [?]	3355
Full solve Ratio	94.48%

#	User	Runtime	Language	Date
1	Mitchell Johnstone	0.01 s	APL	2023-09-12 16:48:14
2	Thomas Feld	0.01 s	APL	2023-09-13 12:07:26

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.01 s	Bash	2023-09-20 07:19:31
2	Thomas Feld	0.01 s	Bash	2023-09-26 14:08:15
3	Danny Robinson	0.01 s	Bash	2023-10-04 00:21:37

#	User	Runtime	Language	Date
1	Eamonn Lye	0.01 s	C#	2017-12-01 23:15:44
2	Eamonn Lye	0.01 s	C#	2017-12-01 23:16:05
3	Hidden user	0.02 s	C#	2014-04-06 07:38:35
4	Kunal Bajpai	0.02 s	C#	2014-06-25 06:28:46
5	Dirk van Eeden	0.02 s	C#	2014-09-12 19:50:57
6	Sampath Vuyyuru	0.02 s	C#	2014-09-16 19:16:27
7	Bora Bilgin	0.02 s	C#	2014-09-18 16:57:40
8	Ayk Stepanyan	0.02 s	C#	2014-09-27 02:32:26
9	masosz	0.02 s	C#	2015-01-23 19:37:29
10	Bas te Kolste	0.02 s	C#	2015-06-18 00:00:59

#	User	Runtime	Language	Date
1	Patrick Bahr	0.04 s	F#	2021-02-21 17:21:16
2	Jacob Harris Cryer Kragh	0.05 s	F#	2022-08-04 18:43:12

#	User	Runtime	Language	Date
1	Krzysztof Gibuła	0.07 s	Go	2019-03-17 14:13:59
2	Jesper Bränn	0.08 s	Go	2014-04-11 14:35:02
3	Lucas Dow	0.08 s	Go	2020-09-15 20:17:35
4	Johannes Matsson	0.08 s	Go	2020-09-18 01:04:18
5	Norbert Voelker	0.08 s	Go	2021-04-14 17:28:01
6	Sean Malloy	0.08 s	Go	2021-11-29 20:41:36
7	Sergey Jakobsen	0.08 s	Go	2022-02-02 18:03:44
8	Hidden user	0.09 s	Go	2016-09-17 21:51:59
9	Kellen Watt	0.09 s	Go	2017-10-01 08:40:36
10	Ciarán Ó hAoláin	0.09 s	Go	2017-12-09 01:46:09

#	User	Runtime	Language	Date
1	Taras Romanyuk	0.04 s	Java	2024-11-11 16:29:29
2	Guangyi Zhou	0.04 s	Java	2025-02-08 18:06:30
3	Edvin Tran	0.04 s	Java	2025-05-04 14:24:58
4	Cesar Gonzalez	0.04 s	Java	2025-11-04 02:33:05
5	Didrik Jonassen	0.05 s	Java	2013-09-28 14:22:47
6	Bora Mollamustafaoglu	0.05 s	Java	2013-09-28 14:23:51
7	Alex Best	0.05 s	Java	2013-09-28 15:46:54
8	Casper Freksen	0.05 s	Java	2013-10-04 12:01:38
9	Mikkel Brun Jakobsen	0.05 s	Java	2013-10-04 12:03:27
10	Jens Jensen	0.05 s	Java	2013-10-04 12:04:21

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	JavaScript (Node.js)	2024-11-26 06:52:42
2	Urban Pettersson	0.05 s	JavaScript (Node.js)	2018-06-22 14:58:00
3	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-05-16 05:21:50
4	Samuel Högfeldt	0.10 s	JavaScript (Node.js)	2023-02-07 14:21:04
5	Gustav Ekner	0.41 s	JavaScript (Node.js)	2020-04-05 22:40:42
6	Chris Wong	0.41 s	JavaScript (Node.js)	2021-02-06 17:50:31
7	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-09 20:28:20
8	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-02-13 11:53:54
9	Hidden user	0.42 s	JavaScript (Node.js)	2021-04-01 16:13:44
10	Khin Nyunt	0.42 s	JavaScript (Node.js)	2021-11-27 16:58:34

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2016-01-04 01:23:26
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-02 23:20:01
3	J M	0.01 s	JavaScript (SpiderMonkey)	2016-10-06 21:47:39
4	Cole Rauh	0.01 s	JavaScript (SpiderMonkey)	2016-10-15 22:33:29
5	Sam Bautista	0.01 s	JavaScript (SpiderMonkey)	2017-01-23 18:34:01
6	Davíð Helgason	0.01 s	JavaScript (SpiderMonkey)	2017-08-10 21:22:28
7	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-16 22:59:52
8	Adam Murphy	0.01 s	JavaScript (SpiderMonkey)	2017-10-26 18:03:35
9	Zachary DeStefano	0.01 s	JavaScript (SpiderMonkey)	2018-01-30 07:05:12
10	Andri Andresson	0.01 s	JavaScript (SpiderMonkey)	2018-05-11 14:12:00

#	User	Runtime	Language	Date
1	Danny Robinson	0.61 s	Julia	2023-10-03 23:59:27
2	Timothy Gaede	0.65 s	Julia	2024-03-27 06:32:34

#	User	Runtime	Language	Date
1	Sam Keyser	0.11 s	Kotlin	2022-09-16 05:27:13
2	Neil Harmon	0.14 s	Kotlin	2019-04-26 11:10:43
3	Jacob Huebner	0.14 s	Kotlin	2020-03-18 02:47:52
4	Dayan Ruben Gonzalez	0.15 s	Kotlin	2020-09-28 17:21:14
5	Jahid Hasan Imon	0.18 s	Kotlin	2020-06-23 02:02:51
6	Merih Bora Poçan	0.18 s	Kotlin	2020-09-14 19:58:35
7	Albert Pala	0.18 s	Kotlin	2021-07-06 01:15:51
8	Alexandre Conte	0.18 s	Kotlin	2021-08-27 16:35:44
9	Adam Rankin	0.18 s	Kotlin	2023-04-27 19:31:15
10	Chris Johnson	0.19 s	Kotlin	2023-09-05 11:57:49

#	User	Runtime	Language	Date
1	Sebastian Sternberg	0.00 s	OCaml	2022-05-07 10:24:41
2	Joel Newman	0.00 s	OCaml	2023-11-07 01:32:38

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-03-03 10:04:48

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	PHP	2018-02-11 01:59:08
2	Petr Trofimov	0.01 s	PHP	2021-04-24 12:06:21
3	Renate	0.01 s	PHP	2021-05-30 23:43:31

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Prolog	2016-12-07 23:15:45
2	Aleksandr Terranova	0.01 s	Prolog	2016-12-09 00:50:05
3	Hidden user	0.01 s	Prolog	2016-12-16 23:08:56
4	Jesper Lundholm	0.01 s	Prolog	2016-12-29 23:27:26
5	Hidden user	0.01 s	Prolog	2017-01-16 23:31:26
6	Isaac Arvestad	0.01 s	Prolog	2017-01-22 18:23:49
7	Gustav Hedengran	0.01 s	Prolog	2017-02-07 16:37:04
8	Hidden user	0.01 s	Prolog	2017-02-13 19:11:08
9	Tobias Brodd	0.01 s	Prolog	2017-04-09 22:35:12
10	Hidden user	0.01 s	Prolog	2017-05-01 23:45:17

#	User	Runtime	Language	Date
1	George Strukov	0.02 s	Python 2	2014-04-12 00:42:54
2	Gustaf Waldemarson	0.02 s	Python 2	2014-08-27 18:08:35
3	Martin Stensgård	0.02 s	Python 2	2014-11-26 02:51:27
4	Ingibergur Sindri Stefnisson	0.02 s	Python 2	2014-12-15 16:56:48
5	Hidden user	0.02 s	Python 2	2015-02-15 21:38:47
6	Hidden user	0.02 s	Python 2	2015-02-20 17:51:43
7	Christofer Ohlsson	0.02 s	Python 2	2015-03-29 21:22:07
8	Team Baud	0.02 s	Python 2	2015-04-16 09:51:43
9	Erik Odenman	0.02 s	Python 2	2015-05-10 17:59:17
10	Ashwin Lall	0.02 s	Python 2	2015-09-08 04:35:27

#	User	Runtime	Language	Date
1	Neil Girdhar	0.02 s	Python 3	2013-10-10 23:44:27
2	Alex Loiko	0.02 s	Python 3	2014-03-28 11:47:17
3	Daniel Duberg	0.02 s	Python 3	2014-04-11 15:09:35
4	Henrik Adolfsson	0.02 s	Python 3	2014-04-12 20:44:54
5	Kunal Bajpai	0.02 s	Python 3	2014-07-01 00:45:17
6	David Szeto	0.02 s	Python 3	2014-11-14 22:52:26
7	Nils Gustafsson	0.02 s	Python 3	2015-03-23 22:02:33
8	Brian Harrington	0.02 s	Python 3	2015-04-16 18:41:16
9	James Elías Sigurðarson	0.02 s	Python 3	2015-05-30 23:28:02
10	Fredrik Carlsen	0.02 s	Python 3	2015-06-07 21:34:06

#	User	Runtime	Language	Date
1	Gerry Hall	0.03 s	Ruby	2016-03-25 16:32:58
2	Casper Christensen	0.03 s	Ruby	2016-04-02 22:15:09
3	Lasse Berglund	0.03 s	Ruby	2016-04-04 13:38:09
4	Savvas Alexandrou	0.04 s	Ruby	2019-01-06 15:40:12
5	Martin Larsson	0.05 s	Ruby	2020-02-28 15:11:08
6	Thomas Feld	0.06 s	Ruby	2023-01-05 16:19:19
7	Simon Lindbäck	0.06 s	Ruby	2023-01-27 10:19:19
8	Alexander Hellstén	0.06 s	Ruby	2023-03-05 16:28:06

#	User	Runtime	Language	Date
1	Avid Fayaz	0.00 s	Swift	2024-03-29 16:16:22

#	User	Length	Language	Date
1	Thomas Feld	32	APL	2023-09-13 12:07:26
2	Mitchell Johnstone	35	APL	2023-09-12 16:48:14

#	User	Length	Language	Date
1	Thomas Feld	49	Bash	2023-09-26 14:08:15
2	Chenzhang Hu	49	Bash	2025-09-12 21:20:24
3	Danny Robinson	70	Bash	2023-10-04 00:21:37

#	User	Length	Language	Date
1	a_b__c	91	C	2021-11-27 18:01:19
2	Azeez Daoud	120	C	2023-03-17 10:23:19
3	Gustaf Sundmark	180	C	2023-04-18 13:27:43
4	David Aldenbro	189	C	2023-03-03 10:56:44
5	Alexander Skalski	220	C	2023-03-03 10:33:22
6	Alexander Runebou	221	C	2023-01-16 13:19:16
7	Hidden user	251	C	2019-04-28 21:42:01
8	Ruben Spaans	256	C	2013-09-28 12:10:19
9	Teddy McCabe	259	C	2014-11-13 02:41:17
10	Emil Wihlander	302	C	2020-11-29 03:32:30

#	User	Length	Language	Date
1	Gregory Sinclair	145	C#	2023-12-01 03:42:11
2	Alexander Hellstén	164	C#	2023-03-05 16:56:34
3	Simon Lindbäck	200	C#	2023-03-02 15:15:41
4	Kunwei Zhang	284	C#	2018-02-14 02:54:48
5	Göran Andersson	320	C#	2022-05-13 20:14:48
6	Esty Crow	354	C#	2023-03-24 00:25:52
7	Khin Nyunt	364	C#	2016-09-30 04:01:45
8	Doug Goodman	415	C#	2018-03-23 22:18:14
9	Anthony Ye	444	C#	2023-03-26 18:00:38
10	Robert Low	457	C#	2016-07-16 14:08:34

#	User	Length	Language	Date
1	Frans Meulenbroeks	125	C++	2024-11-24 15:28:27
2	Anders Mouanga	137	C++	2024-04-24 06:05:58
3	Hakan Kjellerstrand	160	C++	2025-02-28 19:58:01
4	Gustaf Sundmark	180	C++	2023-04-18 13:28:16
5	Raynold Ng	212	C++	2018-04-02 09:26:04
6	Yeung Man Tsung	229	C++	2022-11-27 15:41:10
7	Johan Wind	230	C++	2014-09-28 16:27:08
8	Antonio Molina Lovett	233	C++	2016-08-06 20:38:54
9	Chuck Fernández	237	C++	2016-04-18 04:00:57
10	Đậu Huy Minh	247	C++	2023-09-28 14:56:12

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	330	F#	2022-08-04 18:43:12
2	Patrick Bahr	1974	F#	2021-02-21 17:21:16

#	User	Length	Language	Date
1	Ciarán Ó hAoláin	351	Go	2017-12-09 01:46:50
2	Kellen Watt	353	Go	2017-10-01 08:40:36
3	Sean Malloy	385	Go	2021-11-29 20:41:36
4	Sergey Jakobsen	394	Go	2022-02-02 18:03:44
5	Hidden user	421	Go	2016-09-17 21:51:59
6	Krzysztof Gibuła	459	Go	2019-03-17 14:13:59
7	Johannes Matsson	714	Go	2020-09-18 06:01:45
8	Norbert Voelker	845	Go	2021-04-14 17:28:01
9	Jesper Bränn	883	Go	2014-04-11 14:35:02
10	Lucas Dow	919	Go	2020-09-15 20:17:35

#	User	Length	Language	Date
1	Theodor Ström	78	Haskell	2023-02-24 20:00:26
2	Mathias Magnusson	78	Haskell	2023-02-27 13:00:29
3	Emil Hultcrantz	80	Haskell	2022-10-10 20:26:16
4	Carl Chemnitz	80	Haskell	2024-03-20 14:43:33
5	Zhongmin Hu	84	Haskell	2023-03-22 10:22:25
6	Vincent Lagerros	85	Haskell	2025-11-04 16:24:24
7	David Aldenbro	87	Haskell	2023-03-26 21:23:56
8	Victor Hernadi	89	Haskell	2023-04-12 19:12:54
9	Herdi Saleh	90	Haskell	2025-03-24 09:33:33
10	Simon Lindbäck	97	Haskell	2022-11-17 16:40:42

#	User	Length	Language	Date
1	Hidden user	382	Java	2016-10-29 23:44:42
2	Paul Boddington	386	Java	2016-04-20 20:03:02
3	Doug Goodman	395	Java	2018-03-14 15:21:38
4	Zhi Rui Guo	404	Java	2020-11-14 20:29:12
5	Xuehui Chen	410	Java	2018-06-20 17:30:52
6	Kevin Kauffman	410	Java	2021-12-28 21:31:59
7	Josh Wozniak	415	Java	2018-02-16 03:26:03
8	Hidden user	423	Java	2017-12-01 22:32:29
9	Hidden user	423	Java	2017-12-02 00:03:55
10	Molly Sun	423	Java	2021-03-16 09:18:22

#	User	Length	Language	Date
1	Gurpartap Singh Bhatti	505	JavaScript (Node.js)	2019-05-16 05:21:50
2	Urban Pettersson	508	JavaScript (Node.js)	2018-06-22 14:58:00
3	Chris Wong	508	JavaScript (Node.js)	2021-02-06 17:50:31
4	Gustav Ekner	637	JavaScript (Node.js)	2020-04-05 22:40:42
5	Howard Tin Chi Chan	642	JavaScript (Node.js)	2021-02-13 11:53:54
6	Samuel Högfeldt	685	JavaScript (Node.js)	2023-02-07 14:21:04
7	Khin Nyunt	691	JavaScript (Node.js)	2021-11-27 16:58:34
8	Hidden user	834	JavaScript (Node.js)	2021-04-01 16:13:44
9	Andoko Chandra	851	JavaScript (Node.js)	2020-10-09 20:28:20
10	Hidden user	851	JavaScript (Node.js)	2024-11-26 06:52:42

#	User	Length	Language	Date
1	Zach Tschetter	129	JavaScript (SpiderMonkey)	2023-07-17 22:39:54
2	Jimmy Gustafsson	133	JavaScript (SpiderMonkey)	2024-07-20 23:53:09
3	Cole Rauh	209	JavaScript (SpiderMonkey)	2016-10-15 22:33:29
4	Andrea Bianchessi	225	JavaScript (SpiderMonkey)	2019-10-02 22:45:43
5	Saravanan Kathiresan	323	JavaScript (SpiderMonkey)	2016-10-31 23:44:30
6	Christian Pilegaard Cederquist	328	JavaScript (SpiderMonkey)	2023-01-16 23:12:17
7	Zachary DeStefano	336	JavaScript (SpiderMonkey)	2018-01-30 07:05:12
8	Peter Kedemo	352	JavaScript (SpiderMonkey)	2016-01-04 01:23:26
9	J M	373	JavaScript (SpiderMonkey)	2016-10-06 21:47:39
10	Bjørn Chr. Soltvedt	396	JavaScript (SpiderMonkey)	2016-02-02 23:20:01

#	User	Length	Language	Date
1	Danny Robinson	86	Julia	2023-10-03 23:59:27
2	Timothy Gaede	622	Julia	2024-03-27 06:32:34

#	User	Length	Language	Date
1	Dmitry Shostak	208	Kotlin	2019-08-28 18:57:37
2	Troy Warmboe	243	Kotlin	2020-02-11 02:02:05
3	Sam Keyser	262	Kotlin	2022-09-16 05:27:13
4	Alexandre Conte	279	Kotlin	2021-08-27 16:35:44
5	Albert Pala	281	Kotlin	2021-07-06 01:15:51
6	Chris Johnson	307	Kotlin	2023-09-05 11:57:49
7	Lewis Johnson	351	Kotlin	2023-09-05 13:29:01
8	Jacob Huebner	393	Kotlin	2020-03-18 02:47:52
9	Jahid Hasan Imon	422	Kotlin	2020-06-23 02:02:51
10	Dayan Ruben Gonzalez	445	Kotlin	2020-09-28 17:21:14

#	User	Length	Language	Date
1	Sebastian Sternberg	378	OCaml	2022-05-07 10:43:30
2	Joel Newman	514	OCaml	2023-11-07 01:32:38

#	User	Length	Language	Date
1	Ingemar Ragnemalm	454	Pascal	2018-03-03 10:04:48

#	User	Length	Language	Date
1	Renate	247	PHP	2021-05-30 23:43:31
2	Hidden user	374	PHP	2018-02-11 01:59:08
3	Petr Trofimov	382	PHP	2021-04-24 12:06:21

#	User	Length	Language	Date
1	Hidden user	199	Prolog	2025-04-18 22:19:50
2	Andriy Zyevakov	206	Prolog	2017-07-08 19:02:30
3	Natan Odin Herman Hyötyläinen	355	Prolog	2025-04-21 10:38:59
4	Simon Jutvreten	447	Prolog	2025-04-16 01:33:33
5	Hidden user	543	Prolog	2019-04-29 04:59:39
6	Azeez Daoud	546	Prolog	2023-03-22 12:10:17
7	Axel Lindeberg	562	Prolog	2018-01-02 23:46:54
8	Hidden user	644	Prolog	2025-04-17 21:59:08
9	Elin Inoue	738	Prolog	2021-05-19 18:57:22
10	Hidden user	888	Prolog	2017-02-13 19:11:08

#	User	Length	Language	Date
1	Anthony Blackman	102	Python 2	2013-10-11 20:08:38
2	Andreas Eisele	106	Python 2	2018-10-13 15:26:12
3	Mathis Hammel	112	Python 2	2017-02-15 15:29:55
4	Thomas Feld	114	Python 2	2019-08-19 20:38:29
5	Hidden user	119	Python 2	2015-02-20 17:51:43
6	Erik Odenman	119	Python 2	2015-05-10 17:59:17
7	Martin Stensgård	124	Python 2	2014-11-26 02:51:27
8	Cole Bite	125	Python 2	2017-03-13 18:39:42
9	Çağdaş Öztekin	126	Python 2	2017-08-30 00:53:54
10	Neal Zane	127	Python 2	2015-12-14 02:44:12

#	User	Length	Language	Date
1	Victor Hernadi	55	Python 3	2023-04-12 20:00:58
2	Clement Oh	55	Python 3	2023-05-18 12:38:17
3	Mathias Magnusson	57	Python 3	2023-04-12 23:01:36
4	Benjamin Z White	58	Python 3	2023-03-30 11:58:34
5	Emma Ericsson	58	Python 3	2025-07-08 03:46:52
6	Hidden user	58	Python 3	2025-11-28 12:29:04
7	Mattias Kvist	59	Python 3	2024-02-28 23:46:43
8	Simon Lindbäck	61	Python 3	2023-01-27 09:13:25
9	David Worley	73	Python 3	2025-11-19 21:23:12
10	Elias Amha	74	Python 3	2019-11-26 17:20:31

#	User	Length	Language	Date
1	Thomas Feld	45	Ruby	2023-01-05 16:19:19
2	Alexander Hellstén	72	Ruby	2023-03-05 16:41:32
3	Simon Lindbäck	76	Ruby	2023-02-07 16:27:48
4	Gerry Hall	137	Ruby	2016-03-25 16:32:58
5	Martin Larsson	200	Ruby	2020-02-28 15:11:08
6	Lasse Berglund	252	Ruby	2016-04-04 13:38:09
7	Savvas Alexandrou	303	Ruby	2019-01-06 15:40:12
8	Casper Christensen	655	Ruby	2016-04-02 22:15:09

#	User	Length	Language	Date
1	Vincent Lagerros	240	Rust	2023-02-22 18:39:26
2	Paul Nutini	340	Rust	2023-09-12 06:42:50
3	Mathias Magnusson	350	Rust	2023-04-04 14:12:05
4	Artur Khuziakhmetov	360	Rust	2023-06-02 17:36:14
5	Perešíni Peter	367	Rust	2021-03-11 10:30:50
6	Emil Dichmann	372	Rust	2025-10-20 13:59:39
7	Joe Blower	395	Rust	2025-06-19 02:05:08
8	Tamás Bögi	424	Rust	2021-03-05 09:45:15
9	Miroslav Baláž	455	Rust	2021-02-12 14:16:27
10	Natan Odin Herman Hyötyläinen	455	Rust	2025-04-14 15:46:48

#	User	Length	Language	Date
1	Avid Fayaz	776	Swift	2024-03-29 16:16:22

Solution running time distribution