Problem A
FBI Universal Control Numbers — Problem Statistics

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Submissions	1576
Accepted submissions	858
Submission ratio	54.44%
Authors	800
Full solves [?]	735
Full solve Ratio	91.88%

#	User	Runtime	Language	Date
1	Eric McKnight	0.00 s	C	2017-10-21 20:06:07
2	Ivan Petrov	0.00 s	C	2017-12-06 10:12:45
3	Bergur Snorrason	0.00 s	C	2020-04-15 12:01:15
4	PhilCampbell	0.00 s	C	2021-02-22 19:09:48
5	Jonathan Ski	0.00 s	C	2021-10-11 19:37:59
6	Eyleifur Bjarkason	0.00 s	C	2022-12-29 20:58:27
7	Anthony Pagnotta	0.00 s	C	2023-01-20 23:32:16
8	Tyler Mulholland	0.00 s	C	2025-02-26 21:05:28
9	Hidden user	0.01 s	C	2017-11-08 22:52:06
10	Hidden user	0.01 s	C	2017-11-22 05:06:39

#	User	Runtime	Language	Date
1	Nick Russell	0.05 s	C#	2018-06-18 21:50:25
2	Muhammad Fathir Irhas	0.07 s	C#	2017-10-29 09:45:11
3	Gurpartap Singh Bhatti	0.07 s	C#	2019-10-27 04:32:44
4	Clemens Kerer	0.07 s	C#	2019-11-01 19:42:54
5	Mikael Fiala-Lundström	0.08 s	C#	2021-06-14 21:33:23
6	Natalie Wagner	0.09 s	C#	2025-10-04 19:15:28
7	Abdellatif Elyoussefy	0.11 s	C#	2020-12-27 12:56:48
8	Göran Andersson	0.11 s	C#	2022-05-22 02:05:22

#	User	Runtime	Language	Date
1	Hidden user	0.07 s	Common Lisp	2019-06-11 04:26:35
2	David Cawthon	0.10 s	Common Lisp	2019-05-11 16:24:11

#	User	Runtime	Language	Date
1	Chris Rudolph	0.13 s	F#	2020-11-13 05:13:09
2	Jacob Harris Cryer Kragh	0.15 s	F#	2022-11-06 15:10:44

#	User	Runtime	Language	Date
1	Norbert Voelker	0.07 s	Go	2021-05-25 13:05:01
2	Hidden user	0.14 s	Go	2019-10-29 17:06:24
3	Ian Howell	0.29 s	Go	2019-09-26 22:57:48

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.01 s	Haskell	2024-03-09 18:54:20
2	Tim Put	0.02 s	Haskell	2021-07-31 00:14:00
3	Hidden user	0.03 s	Haskell	2019-04-14 15:55:07
4	Stian	0.03 s	Haskell	2021-10-11 19:11:46
5	Hidden user	0.04 s	Haskell	2019-09-04 15:34:48
6	Hidden user	0.04 s	Haskell	2023-01-19 00:57:16
7	Patrik Lilja	0.05 s	Haskell	2017-10-29 12:26:57
8	Brent Yorgey	0.05 s	Haskell	2017-11-01 05:23:03
9	vagabundus	0.05 s	Haskell	2024-05-04 16:38:46
10	Olle Eriksson	0.06 s	Haskell	2018-06-27 23:40:08

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.08 s	Java	2023-05-06 19:26:41
2	José Vander Meulen	0.10 s	Java	2018-11-28 23:00:24
3	Bjørn Dons	0.11 s	Java	2018-11-27 03:07:22
4	Samuel Klingström	0.13 s	Java	2020-09-09 17:48:31
5	James Black	0.14 s	Java	2018-02-09 20:17:27
6	Zach Glick	0.15 s	Java	2017-10-21 19:50:46
7	Minwei Xu	0.15 s	Java	2017-10-21 20:49:17
8	Nick Wu	0.15 s	Java	2017-10-23 07:11:06
9	Anh Nguyen	0.16 s	Java	2017-10-21 22:28:15
10	Alyssa Herbst	0.17 s	Java	2017-10-21 21:00:02

#	User	Runtime	Language	Date
1	Ehsan	0.27 s	JavaScript (Node.js)	2022-11-18 23:54:26

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.06 s	JavaScript (SpiderMonkey)	2023-02-17 12:00:45
2	Jimmy Gustafsson	0.06 s	JavaScript (SpiderMonkey)	2024-08-21 09:45:09
3	Bjørn Chr. Soltvedt	0.11 s	JavaScript (SpiderMonkey)	2017-10-24 16:09:21

#	User	Runtime	Language	Date
1	Timothy Gaede	0.80 s	Julia	2024-04-23 04:14:09

#	User	Runtime	Language	Date
1	Danny Mittal	0.28 s	Kotlin	2020-10-08 22:26:29
2	Adam Rankin	0.33 s	Kotlin	2023-11-12 20:11:16
3	Neil Harmon	0.60 s	Kotlin	2019-07-11 15:38:57

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.01 s	Pascal	2019-07-13 11:48:17

#	User	Runtime	Language	Date
1	Seyoon Ragavan	0.07 s	Python 2	2017-11-10 21:42:06
2	Hidden user	0.07 s	Python 2	2018-09-23 13:36:40
3	Johan Lyts	0.07 s	Python 2	2019-07-02 21:48:20
4	Yanmarshus Bachtiar	0.07 s	Python 2	2019-10-31 12:07:20
5	Haochen Chen	0.08 s	Python 2	2017-10-21 19:25:06
6	Simran Virk	0.08 s	Python 2	2017-10-21 22:13:25
7	Honorio Vega	0.08 s	Python 2	2018-03-31 02:42:19
8	Maj Stenmark	0.08 s	Python 2	2019-01-14 21:00:06
9	Martin Wan	0.09 s	Python 2	2017-10-21 20:01:16
10	Aarav Singh	0.09 s	Python 2	2017-10-21 20:11:18

#	User	Runtime	Language	Date
1	Reed Christensen	0.05 s	Python 3	2019-12-09 02:51:15
2	Enzio Kam Hai Hong	0.06 s	Python 3	2019-07-15 18:15:03
3	Cameron Cunningham	0.06 s	Python 3	2019-08-08 03:43:50
4	Dominic Berzin Chua Way Gin	0.06 s	Python 3	2025-04-17 13:49:11
5	Kaleo Shinichi Sato	0.07 s	Python 3	2017-10-21 21:13:44
6	Ram Basnet	0.07 s	Python 3	2018-01-10 07:00:01
7	Yang Li	0.07 s	Python 3	2018-04-24 10:58:44
8	Herbert Ilhan Tanujaya	0.07 s	Python 3	2019-02-14 15:53:28
9	James Boyd	0.07 s	Python 3	2019-11-08 05:37:41
10	John Kuroda	0.07 s	Python 3	2019-11-08 06:05:07

#	User	Runtime	Language	Date
1	Kok Dith	0.11 s	Ruby	2021-09-02 03:55:37

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2025-08-19 18:16:56
2	Hidden user	0.02 s	Rust	2019-12-03 01:03:22
3	David Rasch	0.02 s	Rust	2020-10-08 15:21:23
4	Bas Dirks	0.02 s	Rust	2022-01-08 12:49:35
5	Artur Khuziakhmetov	0.02 s	Rust	2025-01-22 16:06:14
6	Klas af Geijerstam	0.03 s	Rust	2020-09-13 16:45:01

#	User	Length	Language	Date
1	Huy Dinh	911	C	2018-05-11 21:45:27
2	Sambit Palit	972	C	2020-09-20 20:25:43
3	PhilCampbell	1347	C	2021-02-22 19:09:48
4	Hidden user	1367	C	2017-11-22 05:06:39
5	Naveen Kumar S	1981	C	2025-04-14 11:40:35
6	Mikael K Eriksson	2403	C	2021-05-22 14:13:30
7	Bergur Snorrason	2512	C	2020-04-15 11:59:11
8	Jonathan Ski	2744	C	2021-10-11 19:37:59
9	Hidden user	2754	C	2017-11-08 22:52:06
10	Anthony Pagnotta	2832	C	2023-01-20 23:32:16

#	User	Length	Language	Date
1	Göran Andersson	1143	C#	2022-05-22 02:05:22
2	Natalie Wagner	1898	C#	2025-10-04 19:15:28
3	Abdellatif Elyoussefy	2183	C#	2020-12-27 12:56:48
4	Nick Russell	2455	C#	2018-06-18 21:50:25
5	Gurpartap Singh Bhatti	3378	C#	2019-10-27 04:18:46
6	Clemens Kerer	4023	C#	2019-11-01 19:42:54
7	Muhammad Fathir Irhas	4302	C#	2017-10-29 09:45:11
8	Mikael Fiala-Lundström	4551	C#	2021-06-14 21:33:23

#	User	Length	Language	Date
1	William Gan	601	C++	2018-03-10 13:56:58
2	Rik Bauwens	689	C++	2021-02-09 22:15:16
3	Souhail Elkaissi	690	C++	2020-12-25 22:59:41
4	Frederick Pek	691	C++	2021-06-19 16:32:12
5	Johan Wind	714	C++	2018-04-02 07:13:32
6	Ashley Khoo	721	C++	2018-11-07 15:15:10
7	Chase Hinesman	737	C++	2018-05-11 03:19:31
8	人外沙耶	782	C++	2020-11-05 13:02:39
9	Hyunjun Lee	783	C++	2022-10-18 12:32:35
10	Ethan Guo	818	C++	2018-11-16 12:41:52

#	User	Length	Language	Date
1	David Cawthon	1379	Common Lisp	2019-05-11 16:24:11
2	Hidden user	3093	Common Lisp	2019-06-11 04:49:32

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1721	F#	2022-11-06 15:10:44
2	Chris Rudolph	3311	F#	2020-11-13 05:13:09

#	User	Length	Language	Date
1	Norbert Voelker	1469	Go	2021-05-25 13:05:01
2	Ian Howell	1498	Go	2019-09-26 22:57:48
3	Hidden user	2620	Go	2019-10-29 17:06:24

#	User	Length	Language	Date
1	Tim Put	911	Haskell	2021-07-31 00:14:00
2	Hidden user	1081	Haskell	2023-01-19 00:57:16
3	Steinar Simonnes	1098	Haskell	2024-03-09 19:00:35
4	Patrik Lilja	1135	Haskell	2017-10-29 12:26:57
5	Brent Yorgey	1271	Haskell	2017-11-01 05:23:03
6	vagabundus	1331	Haskell	2024-05-04 16:38:46
7	Stian	1954	Haskell	2021-10-11 19:11:46
8	Olle Eriksson	1999	Haskell	2018-06-27 23:40:08
9	Hidden user	4019	Haskell	2019-04-14 15:55:07
10	Hidden user	5943	Haskell	2019-09-04 15:34:48

#	User	Length	Language	Date
1	Ryan Looney	808	Java	2017-10-21 22:27:29
2	Doug Goodman	924	Java	2017-11-21 22:32:13
3	Kyle Workman	1170	Java	2018-09-28 18:23:47
4	Jiru Xu	1174	Java	2017-10-21 19:58:53
5	Jiho Kim	1199	Java	2018-11-08 04:42:41
6	Emilie Hyslop	1240	Java	2022-01-14 06:37:16
7	David Van Nguyen	1257	Java	2024-07-10 20:20:11
8	Olesia Elfimova	1348	Java	2017-10-21 20:10:41
9	Brandon Ou	1395	Java	2020-10-08 07:37:57
10	Andrew Polizzotto	1401	Java	2019-09-30 06:52:50

#	User	Length	Language	Date
1	Ehsan	1198	JavaScript (Node.js)	2022-11-18 23:54:26

#	User	Length	Language	Date
1	Jimmy Gustafsson	350	JavaScript (SpiderMonkey)	2024-08-21 09:45:09
2	Christian Pilegaard Cederquist	796	JavaScript (SpiderMonkey)	2023-02-17 12:00:45
3	Bjørn Chr. Soltvedt	825	JavaScript (SpiderMonkey)	2017-10-24 16:09:21

#	User	Length	Language	Date
1	Timothy Gaede	1391	Julia	2024-04-23 04:14:09

#	User	Length	Language	Date
1	Danny Mittal	1058	Kotlin	2020-10-08 22:26:29
2	Adam Rankin	1580	Kotlin	2023-11-12 20:11:16
3	Neil Harmon	2458	Kotlin	2019-07-11 15:38:57

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1034	Pascal	2019-07-13 11:48:17

#	User	Length	Language	Date
1	Thomas Feld	339	Python 2	2019-09-10 13:53:41
2	Cheng Hang	400	Python 2	2017-12-06 09:59:53
3	Lars Åström	451	Python 2	2019-09-16 16:17:23
4	Akif Patel	494	Python 2	2019-04-25 02:43:55
5	Jesper Öqvist	502	Python 2	2018-10-25 18:40:22
6	Matt Bonsall	522	Python 2	2017-10-22 22:29:56
7	Johan Lyts	704	Python 2	2019-07-02 21:48:20
8	Martin Wan	706	Python 2	2017-10-21 20:01:16
9	Wang Zhi Jian	738	Python 2	2019-05-03 07:12:21
10	Honorio Vega	770	Python 2	2018-03-31 02:42:19

#	User	Length	Language	Date
1	Nguyên Khôi Đỗ	254	Python 3	2025-05-29 23:31:31
2	Thibault Raffaillac	270	Python 3	2024-08-19 17:38:55
3	Russell Ng	270	Python 3	2025-06-06 05:09:34
4	Ahmed Chamseddine	334	Python 3	2024-08-23 17:07:02
5	Jason Cannon	347	Python 3	2019-11-21 20:50:10
6	David Alexander R. Amante	393	Python 3	2023-09-29 17:24:14
7	Kenneth Jensen	449	Python 3	2022-08-18 11:36:38
8	Jón Steinn Elíasson	465	Python 3	2018-05-04 18:49:27
9	Tony Feng	465	Python 3	2019-11-14 16:38:49
10	Alan Sanchez	465	Python 3	2019-12-03 18:43:32

#	User	Length	Language	Date
1	Kok Dith	518	Ruby	2021-09-02 03:55:37

#	User	Length	Language	Date
1	Artur Khuziakhmetov	926	Rust	2025-01-22 16:06:14
2	David Rasch	1715	Rust	2020-10-08 15:21:23
3	Hidden user	2043	Rust	2019-12-03 01:03:22
4	Bas Dirks	2050	Rust	2022-01-08 12:49:35
5	Klas af Geijerstam	7591	Rust	2020-09-13 16:45:01
6	Vincent Lagerros	63431	Rust	2025-08-19 18:16:56

Solution running time distribution