Problem A
An Industrial Spy — Problem Statistics

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Submissions	3480
Accepted submissions	1872
Submission ratio	53.79%
Authors	1382
Full solves [?]	1210
Full solve Ratio	87.55%

#	User	Runtime	Language	Date
1	Jesper Öqvist	0.02 s	C	2018-08-30 00:20:49
2	Sabit Zahin	0.03 s	C	2015-10-20 18:13:36
3	Hidden user	0.04 s	C	2019-10-14 04:38:52
4	Ivan Petrov	0.05 s	C	2019-05-23 15:01:36
5	Robin Dražský	0.05 s	C	2022-11-25 23:56:28
6	Hidden user	0.06 s	C	2025-04-26 19:02:54
7	Ryan O'Hara	0.08 s	C	2017-11-10 03:50:32
8	Hidden user	0.09 s	C	2019-07-06 21:30:28
9	Akemi Izuko	0.35 s	C	2023-01-28 05:06:23
10	Lars Kirkholt Melhus	0.52 s	C	2018-10-12 20:06:25

#	User	Runtime	Language	Date
1	Martijn Schuurmans	0.12 s	C#	2016-09-29 08:09:44
2	Vladyslav Panchuk	0.12 s	C#	2025-02-22 21:59:34
3	masosz	0.19 s	C#	2015-03-09 20:58:11
4	Diego Dell	0.19 s	C#	2025-05-29 05:22:08
5	Марія Левицька	0.25 s	C#	2023-07-24 02:26:54
6	Vitalii Buniak	0.25 s	C#	2023-07-24 11:37:14
7	Przemysław Curzytek	0.28 s	C#	2016-11-27 20:10:40
8	David Parker	0.31 s	C#	2023-04-22 15:46:41
9	Павло Немченко	0.69 s	C#	2022-09-29 11:30:58
10	еуые еуые	0.80 s	C#	2023-06-29 16:51:48

#	User	Runtime	Language	Date
1	Dennis Johansson	0.02 s	C++	2014-03-25 23:46:55
2	Stephen Atwood	0.02 s	C++	2015-10-17 05:24:34
3	Kristiyan Balabanov	0.02 s	C++	2016-05-20 01:30:01
4	Minh Phúc Lê	0.02 s	C++	2018-01-19 15:48:42
5	Thomas	0.02 s	C++	2018-12-04 12:04:01
6	Scott MacIntosh	0.02 s	C++	2019-11-19 02:39:13
7	Jerome Leow	0.02 s	C++	2020-12-12 02:59:16
8	Christopher Mårtensson	0.03 s	C++	2018-04-04 07:05:33
9	Armen Andreasyan	0.03 s	C++	2019-04-24 11:11:27
10	fancode	0.03 s	C++	2021-10-21 17:32:35

#	User	Runtime	Language	Date
1	Michal Žáček	0.01 s	Common Lisp	2022-08-07 03:12:15

#	User	Runtime	Language	Date
1	Norbert Voelker	0.10 s	Go	2021-08-26 22:37:17
2	Nick Jarvis	0.48 s	Go	2017-09-22 16:05:21

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.25 s	Haskell	2025-05-28 15:34:58
2	Øyvind Almli	0.31 s	Haskell	2021-05-24 00:50:22
3	Hidden user	0.55 s	Haskell	2022-05-06 19:28:22
4	Tung Nguyen	0.93 s	Haskell	2025-05-15 21:51:51
5	Eskil Andréen	1.07 s	Haskell	2014-12-23 20:21:17
6	Luciano Mattoli	1.12 s	Haskell	2024-12-04 00:58:27
7	David Zacek	1.30 s	Haskell	2021-06-04 19:37:40
8	Lars Tveito	1.34 s	Haskell	2015-08-29 01:04:49
9	Scott Dauer	1.52 s	Haskell	2022-01-07 05:42:19

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.09 s	Java	2025-02-08 19:04:08
2	Bjørn Dons	0.11 s	Java	2018-11-15 21:20:58
3	Frank Ruskey	0.16 s	Java	2016-11-17 19:14:26
4	Evan Dorundo	0.17 s	Java	2015-04-18 19:10:17
5	Sander van Schouwenburg	0.17 s	Java	2017-11-01 09:20:16
6	Nigel Carter	0.19 s	Java	2015-04-18 19:11:01
7	Håkon Hitland	0.19 s	Java	2020-05-18 23:44:27
8	Michael Sullivan	0.20 s	Java	2015-12-28 06:48:59
9	José Vander Meulen	0.20 s	Java	2018-01-13 14:51:28
10	Stephen Royal	0.21 s	Java	2015-04-18 19:07:05

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.31 s	JavaScript (SpiderMonkey)	2016-08-29 00:50:52
2	Christian Cederquist	1.57 s	JavaScript (SpiderMonkey)	2023-05-24 17:35:53
3	Christian Svensson	1.63 s	JavaScript (SpiderMonkey)	2016-08-17 16:13:41

#	User	Runtime	Language	Date
1	Timothy Gaede	0.74 s	Julia	2024-05-21 15:37:03

#	User	Runtime	Language	Date
1	Alexandre Conte	0.95 s	Kotlin	2021-09-17 03:10:14
2	Adam Rankin	1.88 s	Kotlin	2023-09-23 22:48:40
3	Gabriel Novack	1.97 s	Kotlin	2020-02-26 21:10:42

#	User	Runtime	Language	Date
1	Ocram Esah	0.16 s	Python 2	2022-06-06 10:15:23
2	Andreas Björklund	0.18 s	Python 2	2019-10-09 15:46:37
3	Hidden user	0.24 s	Python 2	2017-02-22 12:57:42
4	Johan Lyts	0.24 s	Python 2	2020-10-15 15:04:13
5	Izzati Al Vandiar	0.25 s	Python 2	2015-11-14 12:34:05
6	Paulo Bu	0.26 s	Python 2	2015-04-06 16:59:28
7	Hidden user	0.26 s	Python 2	2018-12-11 00:21:11
8	Gurinder Hans	0.27 s	Python 2	2016-09-04 06:29:02
9	Erik Tjøswold	0.27 s	Python 2	2018-10-12 11:34:22
10	Ethan Chen	0.28 s	Python 2	2015-10-31 03:44:30

#	User	Runtime	Language	Date
1	Wouter Dijkstra	0.16 s	Python 3	2022-07-01 11:42:53
2	Raymond Christopher	0.17 s	Python 3	2024-01-06 20:12:00
3	Ocram Esah	0.19 s	Python 3	2022-06-06 10:15:36
4	Mubarek Shikur	0.22 s	Python 3	2022-06-28 17:41:58
5	Jaga Saju	0.22 s	Python 3	2022-07-02 19:15:20
6	Daniela Cojab Mizrahi	0.22 s	Python 3	2024-11-27 17:51:18
7	Ximena Armijo	0.22 s	Python 3	2025-02-27 21:14:47
8	Santiago Sabat Luna	0.22 s	Python 3	2025-02-28 03:38:52
9	Rafael Ayala Pichardo	0.22 s	Python 3	2025-02-28 17:16:24
10	José Antonio Arzate Martínez	0.22 s	Python 3	2025-03-19 21:28:03

#	User	Runtime	Language	Date
1	Eleanor Janine Juan	0.59 s	Ruby	2025-03-01 07:46:37
2	Thomas Feld	0.75 s	Ruby	2023-05-02 12:54:55
3	Natanael Lundberg	1.27 s	Ruby	2021-09-08 17:53:50
4	André Danielsson	1.62 s	Ruby	2016-12-07 12:04:17

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.03 s	Rust	2024-08-30 00:52:03
2	Michal Žáček	0.04 s	Rust	2022-08-07 02:35:59
3	Judith Hemp	0.08 s	Rust	2021-01-13 11:36:41
4	Xanthron	0.11 s	Rust	2021-08-15 12:44:35
5	Bas Dirks	0.34 s	Rust	2024-02-09 16:59:46

#	User	Runtime	Language	Date
1	Rafael Castro	0.16 s	Zig	2025-03-07 23:17:24

#	User	Length	Language	Date
1	Ivan Petrov	685	C	2019-05-23 15:01:36
2	Lars Kirkholt Melhus	1091	C	2018-10-12 20:06:25
3	Naveen Kumar S	1339	C	2025-05-02 15:19:06
4	Hidden user	1341	C	2025-04-26 19:02:54
5	Jesper Öqvist	1488	C	2018-08-30 00:20:49
6	Akemi Izuko	1665	C	2023-01-28 05:06:23
7	KAVIYA C	1914	C	2025-04-20 08:49:40
8	Hidden user	2046	C	2019-07-06 21:30:28
9	Sabit Zahin	2150	C	2015-10-20 18:13:36
10	Destiny Bailey	2344	C	2021-09-12 23:36:37

#	User	Length	Language	Date
1	Diego Dell	1315	C#	2025-05-29 05:22:08
2	Chris McGarty	1642	C#	2018-10-30 15:57:42
3	Emil Clemedson	1965	C#	2021-09-27 12:11:03
4	Martijn Schuurmans	2114	C#	2016-09-29 08:09:44
5	Kristoffer Strube	2163	C#	2019-09-29 12:41:11
6	Vladyslav Panchuk	2601	C#	2020-03-21 23:17:40
7	Vitalik Dudko	2614	C#	2020-05-18 13:17:07
8	Віталій Дудко	2620	C#	2020-05-18 12:38:25
9	еуые еуые	2653	C#	2023-06-29 16:51:48
10	Apurav Khare	2801	C#	2021-08-26 18:16:23

#	User	Length	Language	Date
1	Omar Salim Moussa	599	C++	2017-08-21 20:20:47
2	William Gan	601	C++	2017-01-25 16:24:56
3	Tomas Hardin	631	C++	2014-09-30 16:16:42
4	Simone Moretti	676	C++	2020-06-01 20:17:39
5	Aryaz Eghbali	677	C++	2015-04-18 19:31:05
6	Anders Westling	716	C++	2012-10-05 23:41:20
7	Håkon Tjeldnes	723	C++	2017-05-23 15:58:07
8	Jerry Zhu	735	C++	2019-10-29 04:20:33
9	Gaël Berlanga	736	C++	2018-04-06 16:50:49
10	Leonardo Blanger	741	C++	2021-04-11 21:12:22

#	User	Length	Language	Date
1	Michal Žáček	2038	Common Lisp	2022-08-06 02:46:49

#	User	Length	Language	Date
1	Nick Jarvis	1207	Go	2017-09-22 16:05:21
2	Norbert Voelker	1916	Go	2021-08-26 22:06:31

#	User	Length	Language	Date
1	David Zacek	539	Haskell	2021-06-04 19:37:40
2	Lars Tveito	574	Haskell	2015-08-29 01:04:49
3	Tung Nguyen	813	Haskell	2025-05-15 21:51:51
4	Eskil Andréen	821	Haskell	2014-12-23 19:46:33
5	Øyvind Almli	1035	Haskell	2021-05-24 00:50:22
6	Hidden user	1280	Haskell	2022-05-06 19:28:22
7	Steinar Simonnes	1306	Haskell	2025-05-28 15:35:42
8	Luciano Mattoli	1692	Haskell	2024-12-04 00:58:27
9	Scott Dauer	2401	Haskell	2022-01-07 05:42:19

#	User	Length	Language	Date
1	Evan Dorundo	875	Java	2015-04-18 19:10:17
2	Stephen Royal	1007	Java	2015-04-18 19:07:05
3	Hidden user	1022	Java	2017-05-06 13:41:57
4	Kurtis Van Gent	1041	Java	2016-02-20 18:23:30
5	Kiên Nguyễn Tiến Trung	1057	Java	2017-01-28 13:09:28
6	Frank Ruskey	1060	Java	2016-11-17 19:14:26
7	Jose Daniel Berba	1176	Java	2015-10-31 01:45:50
8	Zimu Qin	1222	Java	2015-10-23 23:36:12
9	Daniel West	1228	Java	2017-12-07 20:43:58
10	Micah Stairs	1251	Java	2014-10-01 04:05:16

#	User	Length	Language	Date
1	Christian Svensson	1151	JavaScript (SpiderMonkey)	2016-08-17 16:17:15
2	Bjørn Chr. Soltvedt	2559	JavaScript (SpiderMonkey)	2016-08-29 00:50:52
3	Christian Cederquist	2653	JavaScript (SpiderMonkey)	2023-05-24 17:35:53

#	User	Length	Language	Date
1	Timothy Gaede	3994	Julia	2024-05-21 15:32:21

#	User	Length	Language	Date
1	Adam Rankin	1736	Kotlin	2023-09-23 22:48:40
2	Alexandre Conte	1777	Kotlin	2021-09-17 03:10:14
3	Gabriel Novack	2810	Kotlin	2020-02-26 21:10:42

#	User	Length	Language	Date
1	Thomas Feld	432	Python 2	2023-05-02 12:34:34
2	Ethan Chen	521	Python 2	2015-10-31 03:44:30
3	Gurinder Hans	532	Python 2	2016-09-04 06:30:10
4	Lars Tveito	541	Python 2	2015-09-15 16:49:55
5	Måns Magnusson	544	Python 2	2018-10-05 19:33:30
6	Kasra Ghodsi	566	Python 2	2018-10-13 18:32:04
7	Shakeel Samsudeen	578	Python 2	2020-07-13 20:50:06
8	Lars Åström	590	Python 2	2017-11-14 14:51:36
9	Hidden user	598	Python 2	2018-12-11 00:21:11
10	Jákup Innerdahl Hansen	603	Python 2	2022-02-11 19:02:24

#	User	Length	Language	Date
1	Farzam Abrishami	253	Python 3	2025-04-27 19:43:33
2	Benjamin Z White	270	Python 3	2023-05-22 11:34:45
3	Simon Reid	325	Python 3	2023-01-19 20:06:59
4	Lew Choon Hean	341	Python 3	2024-07-04 04:09:03
5	Ahmed Chamseddine	384	Python 3	2025-01-09 18:17:40
6	Suus Brommer	388	Python 3	2025-05-27 17:32:06
7	Raymond Yang	399	Python 3	2019-09-29 20:51:32
8	zain khan	421	Python 3	2025-04-29 16:07:25
9	Manu Lam	441	Python 3	2018-03-18 19:13:37
10	yousef	471	Python 3	2025-04-30 07:13:13

#	User	Length	Language	Date
1	Thomas Feld	120	Ruby	2023-05-02 13:01:16
2	Natanael Lundberg	157	Ruby	2021-09-08 17:53:50
3	André Danielsson	190	Ruby	2016-12-06 20:38:23
4	Eleanor Janine Juan	674	Ruby	2025-03-01 07:34:49

#	User	Length	Language	Date
1	Michal Žáček	1973	Rust	2022-08-04 04:13:36
2	Bas Dirks	2052	Rust	2024-02-09 16:59:46
3	Xanthron	2634	Rust	2021-08-14 12:44:30
4	Judith Hemp	2863	Rust	2021-01-13 11:36:41
5	Vincent Lagerros	26466	Rust	2024-08-30 00:52:44

#	User	Length	Language	Date
1	Rafael Castro	2521	Zig	2025-03-07 23:17:24

Solution running time distribution