Problem A
A Classy Problem — Problem Statistics

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Submissions	23681
Accepted submissions	5910
Submission ratio	24.96%
Authors	5312
Full solves [?]	4062
Full solve Ratio	76.47%

#	User	Runtime	Language	Date
1	Martin Stensgård	0.01 s	C	2017-11-12 06:22:48
2	Bergur Snorrason	0.01 s	C	2018-03-06 09:20:43
3	Mattias Andrée	0.01 s	C	2018-05-02 19:47:30
4	Isaac Pashenkov	0.01 s	C	2020-08-20 01:16:44
5	Gustav Nelson Schneider	0.02 s	C	2016-09-12 11:25:26
6	Gustav Schneider	0.02 s	C	2016-09-12 11:26:40
7	Eyleifur Bjarkason	0.02 s	C	2019-03-25 21:54:46
8	Isaac Saffold	0.02 s	C	2019-11-27 14:04:42
9	Didrik Madheden	0.02 s	C	2021-01-20 02:57:38
10	Jack Rosenthal	0.03 s	C	2015-11-15 07:38:19

#	User	Runtime	Language	Date
1	Nicklas Brindstedt	0.10 s	C#	2018-04-03 21:53:46
2	Pontus Magnusson	0.12 s	C#	2024-03-21 13:11:51
3	Fredrik Wiström	0.14 s	C#	2018-03-27 20:44:06
4	Patrik Blomqvist	0.20 s	C#	2023-10-04 12:42:34
5	Andriy Zyevakov	0.20 s	C#	2025-02-03 05:25:37
6	Nicolai	0.20 s	C#	2025-11-17 21:17:49
7	Mikael Nordman	0.21 s	C#	2025-10-29 15:15:37
8	Matias Córdova	0.22 s	C#	2025-06-12 13:56:50
9	Tom Ilestrand	0.23 s	C#	2019-04-15 12:11:03
10	Lucía María Alvarez Sánchez	0.23 s	C#	2023-04-17 02:24:55

#	User	Runtime	Language	Date
1	Lin Lee	0.01 s	C++	2016-07-20 04:40:50
2	Hidden user	0.01 s	C++	2018-04-18 14:29:26
3	Gabriel Demers	0.02 s	C++	2015-12-22 10:35:20
4	Gustav Schneider	0.02 s	C++	2016-09-12 12:21:03
5	Olle Eriksson	0.02 s	C++	2017-12-10 19:39:34
6	Oscar Sandström	0.02 s	C++	2019-05-17 02:38:23
7	Per Westermark	0.02 s	C++	2020-03-27 00:07:45
8	Tymoteusz Talik	0.02 s	C++	2024-11-03 10:20:45
9	CholRyong Jong	0.03 s	C++	2015-12-06 01:47:27
10	Kazi Ashik Islam	0.03 s	C++	2016-03-17 04:58:03

#	User	Runtime	Language	Date
1	Hidden user	0.42 s	Common Lisp	2019-06-25 17:50:24
2	David Cawthon	0.78 s	Common Lisp	2019-04-21 15:40:33

#	User	Runtime	Language	Date
1	Javier Gómez Díaz	0.20 s	Crystal	2024-07-27 14:11:49

#	User	Runtime	Language	Date
1	Hidden user	0.31 s	F#	2022-07-23 15:11:27
2	Jacob Harris Cryer Kragh	0.42 s	F#	2023-09-02 06:15:15

#	User	Runtime	Language	Date
1	Tolga Atam	0.04 s	Go	2024-10-26 04:44:37
2	Adam Engsig	0.07 s	Go	2023-05-11 09:06:47
3	Michael Laszlo	0.24 s	Go	2016-12-25 09:51:12
4	Norbert Voelker	0.24 s	Go	2022-10-15 15:11:08
5	Hidden user	0.25 s	Go	2024-10-05 00:17:10
6	Johannes Moberg	0.26 s	Go	2018-12-02 22:07:03
7	Krzysztof Gibuła	0.26 s	Go	2019-04-19 21:30:56
8	Iker Lissarrague	0.65 s	Go	2022-03-04 18:56:41
9	Daniel Johansson	0.75 s	Go	2019-08-11 21:41:49

#	User	Runtime	Language	Date
1	Rajashekar R M	0.07 s	Haskell	2025-10-31 16:56:07
2	Tomas Möre	0.09 s	Haskell	2016-08-05 13:23:57
3	Isaac Arvestad	0.15 s	Haskell	2017-02-16 23:42:49
4	Wilfried van Asten	0.19 s	Haskell	2015-12-30 03:08:23
5	Hidden user	0.28 s	Haskell	2020-08-12 11:25:30
6	Lars Corbijn	0.38 s	Haskell	2015-12-19 19:45:45
7	Jørn Lode	0.62 s	Haskell	2020-10-05 21:10:51
8	Simon Marechal	0.66 s	Haskell	2016-10-26 12:31:59
9	Adam Vandolder	0.66 s	Haskell	2019-06-24 20:02:34
10	Aurélien Pepin	0.68 s	Haskell	2019-08-08 11:27:38

#	User	Runtime	Language	Date
1	Clement Oh	0.13 s	Java	2022-07-29 19:10:55
2	Soo Qi Xuan Ian	0.19 s	Java	2020-10-19 18:38:41
3	Asmus Tørsleff	0.20 s	Java	2022-01-17 12:45:28
4	Jeremias Nathanial Liew Yong Hui	0.33 s	Java	2019-11-24 15:23:35
5	Viet Anh Ho	0.39 s	Java	2017-03-26 16:30:03
6	Hidden user	0.40 s	Java	2021-09-21 09:48:27
7	Anders Petersen	0.40 s	Java	2021-09-26 11:54:36
8	Petr Ryšavý	0.41 s	Java	2015-11-22 02:59:33
9	Joakim Algrøy	0.42 s	Java	2018-11-15 12:26:46
10	Nick Wu	0.43 s	Java	2016-10-22 20:43:20

#	User	Runtime	Language	Date
1	jack	0.45 s	JavaScript (Node.js)	2024-12-31 00:05:49
2	Kenneth Chen	0.57 s	JavaScript (Node.js)	2022-06-30 03:31:08
3	Samuel Högfeldt	0.63 s	JavaScript (Node.js)	2022-07-10 12:45:07
4	Dmitrijs Balcers	0.93 s	JavaScript (Node.js)	2021-03-28 19:36:52
5	Karim Dridi	0.96 s	JavaScript (Node.js)	2022-01-14 00:11:35
6	Gert Lenaerts	1.15 s	JavaScript (Node.js)	2020-05-01 12:21:55
7	Stephanie Keck	1.17 s	JavaScript (Node.js)	2020-02-07 08:15:11
8	Hovhannes Kantuni	1.44 s	JavaScript (Node.js)	2021-03-11 21:48:53

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.17 s	JavaScript (SpiderMonkey)	2016-08-02 22:55:25
2	Stian Surén	0.19 s	JavaScript (SpiderMonkey)	2017-04-20 08:07:54
3	Christian Pilegaard Cederquist	0.21 s	JavaScript (SpiderMonkey)	2023-06-07 05:15:28
4	Knut Salomonsson	0.24 s	JavaScript (SpiderMonkey)	2016-11-01 14:24:33
5	Zeyad Osama	0.28 s	JavaScript (SpiderMonkey)	2024-01-22 03:55:45
6	Kārlis Gaņģis	0.45 s	JavaScript (SpiderMonkey)	2019-08-27 13:11:40
7	Peter Kedemo	0.48 s	JavaScript (SpiderMonkey)	2016-04-13 20:12:10
8	Djilani Kebaili	0.60 s	JavaScript (SpiderMonkey)	2018-09-23 05:15:45
9	J M	0.70 s	JavaScript (SpiderMonkey)	2016-10-07 20:01:43

#	User	Runtime	Language	Date
1	Timothy Gaede	1.19 s	Julia	2024-04-23 18:18:09

#	User	Runtime	Language	Date
1	Johnny Baloney	0.65 s	Kotlin	2022-01-03 21:55:35
2	Jacob Huebner	0.82 s	Kotlin	2020-02-26 02:34:40
3	Björn Holm	0.90 s	Kotlin	2019-04-29 14:03:35
4	Nicholas Johnson	0.90 s	Kotlin	2021-11-05 00:51:59
5	Hidden user	1.17 s	Kotlin	2020-04-11 18:02:08
6	Stephen Atwood	1.33 s	Kotlin	2024-05-16 17:55:41
7	Adam Rankin	1.45 s	Kotlin	2023-11-10 17:32:53
8	Adam Koprowski	1.47 s	Kotlin	2020-08-20 12:16:43
9	Sergey Jakobsen	1.72 s	Kotlin	2021-06-09 13:15:35
10	Adrian Wireklint	2.12 s	Kotlin	2021-12-31 14:21:15

#	User	Runtime	Language	Date
1	Hidden user	0.23 s	OCaml	2024-01-16 16:07:15
2	Evan Magill	0.27 s	OCaml	2023-10-01 03:51:29

#	User	Runtime	Language	Date
1	Borislav Anchev	0.14 s	PHP	2016-03-14 06:47:29
2	Jeff Cashion	0.15 s	PHP	2018-04-20 17:56:20
3	Connor Billings	0.16 s	PHP	2020-11-21 23:46:31

#	User	Runtime	Language	Date
1	Johannes Agestam	0.14 s	Python 2	2015-12-21 20:17:16
2	Caleb Clark	0.14 s	Python 2	2017-02-27 08:39:55
3	Agis Daniels	0.14 s	Python 2	2020-05-14 22:54:45
4	Manshant Singh Kohli	0.15 s	Python 2	2015-12-05 23:31:32
5	Martin Jackson	0.15 s	Python 2	2016-08-09 17:37:00
6	Frederik Højholt	0.15 s	Python 2	2016-12-13 17:00:21
7	Adriaan de Vries	0.15 s	Python 2	2017-02-16 20:59:26
8	Urban Pettersson	0.16 s	Python 2	2015-11-29 11:49:40
9	Trevor Masters	0.16 s	Python 2	2015-11-30 19:42:28
10	Ailo Aasen	0.16 s	Python 2	2015-12-26 13:15:51

#	User	Runtime	Language	Date
1	Karl Schärlund	0.14 s	Python 3	2018-03-29 08:41:14
2	Petr	0.14 s	Python 3	2025-06-01 11:02:31
3	Fred Bloggs	0.15 s	Python 3	2019-04-05 09:03:02
4	Hyaline Seiche	0.16 s	Python 3	2017-05-13 17:09:45
5	Ryan Farrell	0.17 s	Python 3	2022-07-07 03:44:21
6	Christian Komusiewicz	0.17 s	Python 3	2024-10-29 21:27:41
7	Mark Meysenburg	0.17 s	Python 3	2025-03-05 16:10:46
8	Vincent Tandya	0.18 s	Python 3	2018-12-16 10:22:45
9	Ryan Chew	0.18 s	Python 3	2019-01-04 18:15:09
10	Ryan Strauss	0.18 s	Python 3	2019-01-10 21:38:37

#	User	Runtime	Language	Date
1	Lee Tze Han	0.37 s	Ruby	2018-06-18 16:49:42
2	Loke Gustafsson	0.42 s	Ruby	2021-02-24 12:28:40
3	Hidden user	0.45 s	Ruby	2019-02-16 22:14:44
4	Thomas Feld	0.48 s	Ruby	2023-05-04 13:12:17
5	Odin Hufnagl	0.54 s	Ruby	2024-02-06 18:26:34
6	Mohamed Elalem	0.61 s	Ruby	2021-01-09 15:58:42
7	Djilani Kebaili	0.67 s	Ruby	2018-09-23 17:23:36
8	Casper Christensen	0.87 s	Ruby	2016-03-10 20:44:06

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Rust	2022-02-19 00:23:50
2	Vincent Lagerros	0.02 s	Rust	2024-06-01 13:23:40
3	Bas Dirks	0.04 s	Rust	2025-02-19 20:12:16
4	Joe Blower	0.07 s	Rust	2025-06-11 21:43:57
5	Mathias Svensson	0.08 s	Rust	2020-04-08 10:51:12
6	Christofer Nolander	0.09 s	Rust	2018-11-28 18:00:05
7	Pahlevi Fikri Auliya	0.09 s	Rust	2020-10-26 23:10:24
8	Andrew Blackwell	0.09 s	Rust	2025-09-04 22:51:05
9	David Rasch	0.10 s	Rust	2021-05-11 15:18:29
10	Daniel Anker Hermansen	0.10 s	Rust	2023-05-28 07:21:56

#	User	Runtime	Language	Date
1	Javier Gómez Díaz	0.01 s	Zig	2024-07-27 15:14:58

#	User	Length	Language	Date
1	Thibault Raffaillac	834	C	2017-04-24 16:41:19
2	Jack Rosenthal	1162	C	2015-11-15 07:38:19
3	Isaac Pashenkov	1173	C	2023-06-04 04:29:31
4	Mattias Andrée	1230	C	2018-05-02 18:55:21
5	Martin Stensgård	1519	C	2017-11-12 02:36:25
6	Mirel Cosulschi	1643	C	2025-04-12 20:55:05
7	sicupu	1677	C	2020-11-22 08:48:19
8	Bochuan Lu	1726	C	2017-04-27 21:12:19
9	Gustav Schneider	1730	C	2016-09-12 12:21:26
10	Bui Phuong Nam	1756	C	2022-11-05 04:15:12

#	User	Length	Language	Date
1	Björn Gunnarsson	1394	C#	2016-09-18 15:22:29
2	Þorgeir Auðunn Karlsson	1394	C#	2016-09-18 15:26:45
3	Marek Bina	1445	C#	2019-02-16 16:39:48
4	Liam Percy	1605	C#	2019-01-11 19:20:51
5	Albert Jende	1727	C#	2025-11-17 13:26:10
6	Mateo Salazar Mitchell	1794	C#	2025-06-26 13:48:59
7	Pablo Quiroz	1867	C#	2025-06-21 03:33:50
8	Mikael Nordman	1895	C#	2025-10-29 15:15:37
9	Marius Løkketangen	1990	C#	2017-04-19 15:09:50
10	Shantanu Sharma	2020	C#	2025-10-20 00:45:05

#	User	Length	Language	Date
1	David Narum	654	C++	2018-09-04 14:14:05
2	Hyunjun Lee	756	C++	2022-10-27 07:28:01
3	Johan Wind	767	C++	2015-11-26 13:35:19
4	Dongjian Tang	784	C++	2017-05-18 23:18:39
5	William Gan	790	C++	2017-01-18 15:16:43
6	Lav Radosavljevic	798	C++	2018-07-26 16:12:50
7	Hidden user	810	C++	2017-10-20 10:05:02
8	Ragur Krishnan	817	C++	2018-08-03 16:08:57
9	Birk Tjelmeland	822	C++	2017-11-07 14:49:36
10	Manshant Singh Kohli	826	C++	2017-02-18 22:17:47

#	User	Length	Language	Date
1	Hidden user	1294	Common Lisp	2019-06-25 17:25:34
2	David Cawthon	2498	Common Lisp	2019-04-21 15:40:33

#	User	Length	Language	Date
1	Javier Gómez Díaz	646	Crystal	2024-07-27 14:11:49

#	User	Length	Language	Date
1	Hidden user	1357	F#	2022-07-23 15:12:23
2	Jacob Harris Cryer Kragh	2106	F#	2023-09-02 06:15:15

#	User	Length	Language	Date
1	Iker Lissarrague	1135	Go	2022-03-04 19:30:22
2	Daniel Johansson	1444	Go	2019-08-11 21:41:49
3	Norbert Voelker	1447	Go	2022-10-15 15:11:08
4	Johannes Moberg	1519	Go	2018-12-03 13:35:41
5	Krzysztof Gibuła	1681	Go	2019-04-19 21:30:56
6	Michael Laszlo	1811	Go	2016-12-25 10:00:00
7	Hidden user	1879	Go	2024-10-05 00:17:10
8	Tolga Atam	2490	Go	2024-10-26 04:00:31
9	Adam Engsig	4995	Go	2021-07-03 20:46:08

#	User	Length	Language	Date
1	Anthony Clark	710	Haskell	2017-03-04 01:47:06
2	Paul Wild	748	Haskell	2018-05-01 04:43:18
3	Alberto Cerezo Cid	845	Haskell	2017-03-08 21:45:58
4	Hidden user	871	Haskell	2023-05-24 22:12:43
5	Hidden user	1064	Haskell	2020-08-12 11:25:30
6	Antony Lee	1074	Haskell	2016-12-31 00:28:31
7	Andrew Mark Allen	1112	Haskell	2017-03-09 21:55:48
8	Lim Ming Yean	1137	Haskell	2019-03-29 11:30:27
9	Steinar Simonnes	1163	Haskell	2025-10-10 20:29:38
10	Rajashekar R M	1176	Haskell	2025-10-31 16:56:07

#	User	Length	Language	Date
1	Padjie	618	Java	2022-04-19 18:48:22
2	Kiên Nguyễn Tiến Trung	926	Java	2017-01-21 20:37:35
3	Jonathan Ho Kai Jian	964	Java	2025-09-08 05:28:37
4	Erlandas Miezys	1161	Java	2017-08-02 16:36:31
5	Qianlang Chen	1198	Java	2020-09-22 03:36:59
6	Hidden user	1236	Java	2016-08-18 07:21:31
7	Benjamin Laurence Erickson	1248	Java	2016-10-26 23:47:21
8	Mitch Price	1265	Java	2016-12-20 05:15:01
9	Joshua Alman	1273	Java	2016-10-22 18:27:50
10	Hidden user	1277	Java	2022-05-01 07:12:27

#	User	Length	Language	Date
1	Karim Dridi	1051	JavaScript (Node.js)	2022-01-14 00:11:35
2	Hovhannes Kantuni	1703	JavaScript (Node.js)	2021-03-11 21:48:53
3	Kenneth Chen	1704	JavaScript (Node.js)	2022-06-30 03:31:08
4	Gert Lenaerts	1970	JavaScript (Node.js)	2020-05-01 12:21:55
5	Samuel Högfeldt	2042	JavaScript (Node.js)	2022-07-10 12:45:07
6	jack	2229	JavaScript (Node.js)	2024-12-31 00:05:49
7	Dmitrijs Balcers	2283	JavaScript (Node.js)	2021-03-28 19:36:52
8	Stephanie Keck	15235	JavaScript (Node.js)	2020-02-07 08:15:11

#	User	Length	Language	Date
1	Kārlis Gaņģis	441	JavaScript (SpiderMonkey)	2019-08-27 13:11:40
2	Bjørn Chr. Soltvedt	627	JavaScript (SpiderMonkey)	2016-08-02 22:55:25
3	Peter Kedemo	692	JavaScript (SpiderMonkey)	2016-04-13 20:12:10
4	Christian Pilegaard Cederquist	762	JavaScript (SpiderMonkey)	2023-06-07 05:15:28
5	Knut Salomonsson	1035	JavaScript (SpiderMonkey)	2016-11-01 14:24:33
6	Zeyad Osama	1051	JavaScript (SpiderMonkey)	2024-01-22 03:55:45
7	Djilani Kebaili	1185	JavaScript (SpiderMonkey)	2018-09-23 04:44:18
8	J M	1213	JavaScript (SpiderMonkey)	2016-10-07 20:01:43
9	Stian Surén	1274	JavaScript (SpiderMonkey)	2017-04-20 08:07:54

#	User	Length	Language	Date
1	Timothy Gaede	1396	Julia	2024-04-23 18:18:09

#	User	Length	Language	Date
1	Sergey Jakobsen	741	Kotlin	2021-06-09 13:15:35
2	Adam Koprowski	1047	Kotlin	2020-08-20 12:16:43
3	Stephen Atwood	1099	Kotlin	2024-05-16 17:55:41
4	Adrian Wireklint	1109	Kotlin	2021-12-31 14:21:15
5	Adam Rankin	1319	Kotlin	2023-11-10 17:32:53
6	Jacob Huebner	1591	Kotlin	2020-02-26 02:34:40
7	Johnny Baloney	1663	Kotlin	2022-01-03 21:48:44
8	Hidden user	2211	Kotlin	2020-04-11 18:02:08
9	Björn Holm	2328	Kotlin	2019-04-29 13:52:00
10	Nicholas Johnson	2944	Kotlin	2021-11-05 00:51:59

#	User	Length	Language	Date
1	Hidden user	1311	OCaml	2024-01-16 16:07:15
2	Evan Magill	1508	OCaml	2023-10-01 03:51:29

#	User	Length	Language	Date
1	Borislav Anchev	989	PHP	2016-03-14 06:47:29
2	Connor Billings	1388	PHP	2020-11-21 23:46:31
3	Jeff Cashion	1730	PHP	2018-04-20 17:56:20

#	User	Length	Language	Date
1	Thomas Feld	322	Python 2	2019-08-21 13:15:44
2	Johannes Agestam	334	Python 2	2015-12-21 19:57:22
3	Justin Su	341	Python 2	2019-10-01 22:14:46
4	Nico Weber	393	Python 2	2016-11-16 21:46:04
5	Daniel Strizhevsky	397	Python 2	2016-10-22 18:09:23
6	Jeff Robertson	399	Python 2	2017-04-16 01:39:42
7	Lim Hong Hui Eugene	400	Python 2	2016-08-07 02:29:01
8	Fan Jiang	413	Python 2	2018-09-27 21:24:51
9	Maryam Miri	414	Python 2	2017-03-09 07:12:03
10	Edward Sikorski	417	Python 2	2016-05-22 08:23:03

#	User	Length	Language	Date
1	Erik Åman	193	Python 3	2023-12-08 19:52:13
2	Gustav Elmqvist	199	Python 3	2023-03-27 22:01:39
3	Sander Oppen	201	Python 3	2024-08-20 13:50:29
4	Kaaden RumanCam	211	Python 3	2023-04-27 04:10:52
5	Edvard Walde Heimdal	213	Python 3	2024-08-20 13:43:58
6	Michael Goldwasser	214	Python 3	2024-09-13 04:58:00
7	Kevin Gomez	228	Python 3	2023-08-28 04:55:42
8	Ahmed Chamseddine	237	Python 3	2023-10-23 09:50:29
9	Patrick Jung	243	Python 3	2022-11-05 03:09:20
10	Lee Isaac	261	Python 3	2023-05-27 18:28:41

#	User	Length	Language	Date
1	Thomas Feld	130	Ruby	2023-05-04 13:12:17
2	Hidden user	602	Ruby	2019-02-16 22:14:44
3	Casper Christensen	652	Ruby	2016-03-18 17:06:50
4	Mohamed Elalem	712	Ruby	2021-01-09 15:58:42
5	Lee Tze Han	771	Ruby	2018-06-18 16:49:42
6	Loke Gustafsson	820	Ruby	2021-02-24 12:28:40
7	Djilani Kebaili	893	Ruby	2018-09-23 17:23:36
8	Odin Hufnagl	2549	Ruby	2024-02-06 18:26:34

#	User	Length	Language	Date
1	Bas Dirks	1444	Rust	2022-01-10 20:56:08
2	Mathias Svensson	1501	Rust	2020-04-08 10:51:12
3	Andrew Blackwell	1523	Rust	2025-09-04 22:50:28
4	Joe Blower	1571	Rust	2025-06-11 20:26:55
5	David Rasch	1825	Rust	2021-05-11 15:18:29
6	Simon Hallefält	1938	Rust	2023-07-13 13:14:22
7	Hidden user	2111	Rust	2022-02-19 04:15:54
8	Ming Kang	2249	Rust	2025-06-03 17:28:17
9	Ritwin Narra	2302	Rust	2021-06-18 03:22:25
10	Nikita Chudakov	2304	Rust	2024-01-24 23:45:37

#	User	Length	Language	Date
1	Javier Gómez Díaz	2415	Zig	2024-07-27 15:14:58

Solution running time distribution