Problem K
Blackboard Numbers — Problem Statistics

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Submissions	2866
Accepted submissions	797
Submission ratio	27.81%
Authors	668
Full solves [?]	564
Full solve Ratio	84.43%

#	User	Runtime	Language	Date
1	Daniel Worsnup	0.02 s	C	2016-05-01 04:47:18
2	Isaac Saffold	0.02 s	C	2018-12-25 00:36:32
3	Eyleifur Bjarkason	0.03 s	C	2019-03-15 17:05:39
4	David Hinschberger	0.04 s	C	2018-04-10 22:25:59
5	Tandin Wangchuk	0.04 s	C	2019-06-02 14:10:10
6	Ivan Petrov	0.04 s	C	2019-11-11 08:21:56
7	Marko Grabas	0.04 s	C	2019-11-16 15:47:53
8	i_love_ pickles	0.04 s	C	2019-11-26 15:06:11
9	Bianca Benedictos	0.04 s	C	2019-12-17 18:15:20
10	Maria Jose Elumba	0.04 s	C	2019-12-18 07:27:47

#	User	Runtime	Language	Date
1	Gustav Kalander	0.04 s	C#	2018-06-11 17:43:06
2	Thang Le Huu	0.05 s	C#	2019-11-28 05:09:37
3	Kelvin Snepvangers	0.06 s	C#	2018-10-06 20:47:32
4	Sjoerd Teunisse	0.06 s	C#	2018-10-06 20:48:17
5	Mike Garrett	0.06 s	C#	2019-03-04 04:16:21

#	User	Runtime	Language	Date
1	Noah Weninger	0.00 s	C++	2018-12-25 05:53:21
2	Magnus Hegdahl	0.00 s	C++	2022-01-06 20:26:28
3	Frederick Ivan Tan	0.00 s	C++	2023-02-18 07:38:29
4	Max Nilsson	0.00 s	C++	2023-09-12 23:15:38
5	Gao Tianrun	0.00 s	C++	2024-03-28 07:22:39
6	Tan Kwang Thiag	0.00 s	C++	2024-03-31 19:28:42
7	Trần Cảnh Nam	0.00 s	C++	2025-03-02 14:43:03
8	Lew Choon Hean	0.00 s	C++	2025-05-04 04:32:49
9	Winston Cat	0.00 s	C++	2025-09-14 13:25:40
10	Tamoghno Banerjee	0.00 s	C++	2025-12-07 22:34:35

#	User	Runtime	Language	Date
1	Hidden user	0.09 s	Common Lisp	2019-07-11 07:34:00

#	User	Runtime	Language	Date
1	Harrison Shen	0.02 s	Go	2021-11-04 00:50:18
2	Erlend Fonnes	0.12 s	Go	2021-05-18 22:11:28
3	Aleksandar Mitic	0.13 s	Go	2016-12-24 17:20:01

#	User	Runtime	Language	Date
1	Brent Yorgey	0.01 s	Haskell	2025-02-07 02:25:45
2	Øyvind Almli	0.02 s	Haskell	2021-05-19 10:51:20
3	Morten Lohne	0.24 s	Haskell	2018-04-17 21:38:09
4	Birk Tjelmeland	0.25 s	Haskell	2018-05-23 18:11:12

#	User	Runtime	Language	Date
1	David Brink	0.10 s	Java	2017-01-05 20:34:25
2	Bob Joe	0.10 s	Java	2017-11-06 21:55:53
3	Matthew Zhang	0.10 s	Java	2017-11-08 17:22:20
4	Fredrik Lygre Bergesen	0.10 s	Java	2018-05-03 20:02:20
5	Anil Ghimire	0.10 s	Java	2018-05-27 01:16:53
6	Erik Baalhuis	0.11 s	Java	2015-10-04 21:09:34
7	Robert Slutsky	0.11 s	Java	2017-11-07 12:06:47
8	Joakim Kårstad Tran	0.11 s	Java	2018-05-08 17:26:39
9	Eyleifur Bjarkason	0.11 s	Java	2018-12-18 21:47:03
10	Sawyer Stanley	0.11 s	Java	2022-08-04 23:02:52

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.03 s	JavaScript (SpiderMonkey)	2023-08-13 12:08:52
2	Bjørn Chr. Soltvedt	0.31 s	JavaScript (SpiderMonkey)	2016-10-30 17:31:14

#	User	Runtime	Language	Date
1	Hidden user	0.38 s	Julia	2025-04-22 07:13:23
2	Timothy Gaede	0.94 s	Julia	2024-09-03 07:05:15

#	User	Runtime	Language	Date
1	Phường Lên	0.29 s	Kotlin	2020-02-03 20:38:01
2	Simon Lindhen	0.30 s	Kotlin	2018-10-07 13:51:30
3	Hidden user	0.30 s	Kotlin	2020-02-26 22:42:12
4	Adam Koprowski	0.32 s	Kotlin	2021-04-06 17:24:49
5	poppyer	0.32 s	Kotlin	2022-07-18 16:10:31

#	User	Runtime	Language	Date
1	Oskar Haarklou Veileborg	0.05 s	Python 2	2015-04-25 11:45:58
2	Asger Hautop Drewsen	0.05 s	Python 2	2015-11-01 14:55:33
3	Agis Daniels	0.05 s	Python 2	2020-06-08 13:41:07
4	Patrik Lilja	0.06 s	Python 2	2015-10-22 21:27:18
5	Johan Lyts	0.06 s	Python 2	2020-01-22 14:19:51
6	Lars Tveito	0.08 s	Python 2	2015-10-26 23:55:32
7	Greg Hamerly	0.08 s	Python 2	2015-12-15 22:32:24
8	Tomas Alvarez	0.08 s	Python 2	2017-09-11 18:44:11
9	Daniel Widmer	0.08 s	Python 2	2018-04-18 16:28:00
10	Øyvind Haarberg	0.09 s	Python 2	2018-04-20 14:01:06

#	User	Runtime	Language	Date
1	Bjørn Dons	0.05 s	Python 3	2019-02-22 02:37:17
2	Sander Oppen	0.05 s	Python 3	2024-10-28 20:23:59
3	Nhự Nương Họ Vũ	0.05 s	Python 3	2025-03-25 20:30:17
4	Xiaoyang Xu	0.05 s	Python 3	2025-11-28 01:32:46
5	Ruizhe Jiang	0.05 s	Python 3	2025-12-06 05:10:07
6	Ocram Esah	0.06 s	Python 3	2022-02-15 19:37:45
7	Agis Daniels	0.07 s	Python 3	2020-06-08 13:40:37
8	Sidharth Sundar	0.07 s	Python 3	2021-04-11 22:33:57
9	András Biczó	0.07 s	Python 3	2023-04-16 21:59:05
10	Ole Vik Lysne	0.07 s	Python 3	2025-05-24 12:39:00

#	User	Runtime	Language	Date
1	Thomas Feld	0.06 s	Ruby	2023-08-14 07:59:06
2	Donald Dong	0.23 s	Ruby	2019-04-18 03:51:21
3	Zohar Malamant	0.62 s	Ruby	2018-04-20 23:25:16

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2024-02-02 16:57:03
2	Yoeri Otten	0.07 s	Rust	2022-11-16 14:43:15
3	Jonathan Choi	0.07 s	Rust	2024-04-15 03:59:29
4	Artur Khuziakhmetov	0.07 s	Rust	2025-01-28 08:22:31
5	Arnav Sastry	0.09 s	Rust	2021-08-16 21:45:45

#	User	Length	Language	Date
1	Ivan Petrov	2239	C	2019-11-11 08:21:56
2	Ali A. Alrufaiee	2395	C	2022-09-02 01:49:27
3	Aman Banti	2395	C	2023-06-01 14:14:31
4	Fahmi Dinsefa	2396	C	2023-07-09 12:37:52
5	Minhajur Rahman	2397	C	2021-07-17 15:46:50
6	hk	2398	C	2022-10-22 10:46:21
7	Daniel Worsnup	2478	C	2016-05-01 04:47:18
8	David Hinschberger	2486	C	2018-04-10 22:25:59
9	Tandin Wangchuk	2486	C	2019-06-02 14:10:10
10	i_love_ pickles	2486	C	2019-11-26 15:06:11

#	User	Length	Language	Date
1	Gustav Kalander	2836	C#	2018-06-11 17:43:06
2	Mike Garrett	2905	C#	2019-03-04 04:16:21
3	Thang Le Huu	3171	C#	2019-11-28 05:09:37
4	Sjoerd Teunisse	4018	C#	2019-09-30 19:03:22
5	Kelvin Snepvangers	4308	C#	2018-10-06 20:47:32

#	User	Length	Language	Date
1	Johan Wind	834	C++	2016-04-15 16:24:05
2	David Zheng	916	C++	2018-12-22 22:33:22
3	Malcolm Karutz	941	C++	2019-03-04 08:29:53
4	Geir-Arne Fuglstad	982	C++	2015-04-25 10:46:11
5	Christian Yongwhan Lim	1006	C++	2023-06-23 16:17:48
6	Kaze Ashitano	1023	C++	2020-10-20 10:45:47
7	Mukerem Ali Nur	1045	C++	2019-11-19 09:02:20
8	Brage Isak Keiserås Bakkane	1062	C++	2021-05-24 15:36:52
9	Markus Mathiasen	1064	C++	2023-08-17 20:27:41
10	Kyle Perry	1084	C++	2024-04-11 06:28:03

#	User	Length	Language	Date
1	Hidden user	1092	Common Lisp	2019-07-11 07:34:00

#	User	Length	Language	Date
1	Erlend Fonnes	1144	Go	2021-05-18 22:11:28
2	Harrison Shen	1438	Go	2021-11-03 23:29:29
3	Aleksandar Mitic	2952	Go	2016-12-24 17:20:01

#	User	Length	Language	Date
1	Birk Tjelmeland	640	Haskell	2018-05-23 18:11:12
2	Morten Lohne	1206	Haskell	2018-04-23 15:16:42
3	Øyvind Almli	1447	Haskell	2021-05-18 22:50:06
4	Brent Yorgey	2814	Haskell	2021-03-20 10:59:05

#	User	Length	Language	Date
1	Caeden Whitaker	712	Java	2021-12-22 18:27:00
2	Michael Zündorf	754	Java	2019-02-12 22:31:14
3	Taylor Wong	854	Java	2024-04-14 02:52:32
4	Ng Tze Henn	877	Java	2023-07-29 14:32:35
5	Martin Wan	898	Java	2017-11-05 07:58:56
6	Dick Ong	901	Java	2023-08-03 06:46:50
7	Tan Wei Seng	909	Java	2023-04-12 03:21:36
8	Jan Štola	924	Java	2015-06-07 18:52:24
9	Jeremy Archer	927	Java	2015-05-02 17:18:29
10	Sam Reinehr	982	Java	2018-09-12 22:37:36

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	995	JavaScript (SpiderMonkey)	2016-10-30 17:31:14
2	Christian Pilegaard Cederquist	2365	JavaScript (SpiderMonkey)	2023-08-13 12:08:52

#	User	Length	Language	Date
1	Hidden user	655	Julia	2025-04-22 07:13:23
2	Timothy Gaede	5653	Julia	2024-09-03 07:05:15

#	User	Length	Language	Date
1	poppyer	959	Kotlin	2022-07-18 16:10:31
2	Adam Koprowski	974	Kotlin	2021-04-06 17:24:49
3	Hidden user	1281	Kotlin	2020-02-26 22:42:12
4	Phường Lên	1694	Kotlin	2020-02-03 20:38:01
5	Simon Lindhen	2614	Kotlin	2018-10-07 13:51:30

#	User	Length	Language	Date
1	Tore Norderud	452	Python 2	2015-04-25 16:30:19
2	Herbert Ilhan Tanujaya	510	Python 2	2019-05-03 16:02:10
3	Lars Tveito	631	Python 2	2015-10-26 23:55:32
4	Patrik Lilja	691	Python 2	2015-10-22 21:27:18
5	Guan Yang Ze	747	Python 2	2020-02-11 16:53:03
6	Alex Lewin	766	Python 2	2020-02-19 00:20:56
7	Ragur Krishnan	792	Python 2	2018-12-22 19:22:41
8	Balder Søholt Halmrast	819	Python 2	2015-04-25 10:45:52
9	RandyWaterhouse	831	Python 2	2021-08-14 06:27:27
10	Haggai Liu	833	Python 2	2017-06-15 05:19:25

#	User	Length	Language	Date
1	Benjamin Z White	192	Python 3	2023-06-08 19:28:16
2	Peter Stauder	313	Python 3	2023-01-13 21:04:12
3	Jason Clarke	402	Python 3	2024-04-09 13:39:40
4	Teikn Smith	425	Python 3	2024-08-02 04:14:11
5	Xiaoyang Xu	506	Python 3	2025-11-28 00:58:42
6	Bryan Wong Wei Heng	534	Python 3	2020-04-08 13:11:06
7	Timothy White	551	Python 3	2023-03-11 04:09:12
8	Iman Khodadi	603	Python 3	2022-12-07 12:14:36
9	Ole Vik Lysne	607	Python 3	2025-05-24 12:39:00
10	Joshua Coward	612	Python 3	2021-09-07 22:56:05

#	User	Length	Language	Date
1	Thomas Feld	108	Ruby	2023-08-14 08:26:48
2	Zohar Malamant	340	Ruby	2018-04-20 23:25:16
3	Donald Dong	544	Ruby	2019-04-18 03:51:21

#	User	Length	Language	Date
1	Artur Khuziakhmetov	1219	Rust	2025-01-28 08:22:31
2	Yoeri Otten	2549	Rust	2022-11-16 14:43:15
3	Vincent Lagerros	2694	Rust	2024-02-02 16:57:03
4	Arnav Sastry	2942	Rust	2021-08-16 21:45:45
5	Jonathan Choi	4509	Rust	2024-04-15 03:59:29

Solution running time distribution