Problem A
Luhn's Checksum Algorithm — Problem Statistics

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Submissions	5265
Accepted submissions	2664
Submission ratio	50.60%
Authors	2543
Full solves [?]	2388
Full solve Ratio	93.90%

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-09-30 07:29:37

#	User	Runtime	Language	Date
1	Chris McGarty	0.02 s	C#	2018-10-30 19:32:20
2	Sean McGarty	0.02 s	C#	2018-10-31 16:27:42
3	Martin Wallgren	0.02 s	C#	2018-11-28 09:14:02
4	Eric Bäckhage	0.02 s	C#	2019-02-15 21:51:10
5	Mehdi Adelzadeh	0.02 s	C#	2019-06-21 23:54:23
6	Thomas Norris	0.02 s	C#	2019-09-20 18:38:10
7	Keiron Beadle	0.02 s	C#	2019-09-29 16:49:49
8	Michael Palkovics	0.02 s	C#	2019-11-10 02:26:49
9	Johan Pettersson	0.02 s	C#	2019-11-22 04:09:01
10	Sebastian Gielinger	0.02 s	C#	2019-12-12 08:26:53

#	User	Runtime	Language	Date
1	Philippos Boon Alexaki	0.01 s	Common Lisp	2019-11-18 18:01:38
2	David Cawthon	0.02 s	Common Lisp	2019-04-13 03:22:54
3	Hidden user	0.02 s	Common Lisp	2019-05-25 06:10:51
4	Hidden user	0.03 s	Common Lisp	2019-01-08 13:20:00

#	User	Runtime	Language	Date
1	Patrick Bahr	0.04 s	F#	2021-02-21 22:20:51
2	Sebastian Sternberg	0.04 s	F#	2021-08-25 19:01:50
3	Jacob Harris Cryer Kragh	0.04 s	F#	2022-06-27 17:26:59

#	User	Runtime	Language	Date
1	Anmol Sharma	0.02 s	Go	2019-11-08 12:34:46
2	Krzysztof Gibuła	0.02 s	Go	2021-05-11 18:36:29
3	Felix Fatum	0.02 s	Go	2022-09-26 13:48:16
4	William Fiset	0.07 s	Go	2018-10-27 06:40:35
5	Patrik Lilja	0.07 s	Go	2018-11-15 19:15:21
6	Eric Martin	0.07 s	Go	2018-12-24 04:32:31
7	Conor McGovern	0.07 s	Go	2019-03-09 19:49:29
8	Norbert Voelker	0.08 s	Go	2021-04-15 21:38:04

#	User	Runtime	Language	Date
1	Shinji Koshida	0.00 s	Haskell	2025-03-28 09:19:57
2	Brent Yorgey	0.01 s	Haskell	2018-10-17 14:46:50
3	Intrets	0.01 s	Haskell	2019-04-05 18:54:36
4	Matthew Johnson	0.01 s	Haskell	2019-05-15 07:28:33
5	Isaac Arvestad	0.01 s	Haskell	2019-08-11 15:02:56
6	Hidden user	0.01 s	Haskell	2019-08-13 11:53:25
7	Rudi Svartveit	0.01 s	Haskell	2019-09-11 16:47:37
8	Mitchell Wright	0.01 s	Haskell	2020-02-19 18:53:22
9	Steinar Simonnes	0.01 s	Haskell	2020-09-03 20:57:12
10	Andrés Marzal Varó	0.01 s	Haskell	2020-10-10 17:46:13

#	User	Runtime	Language	Date
1	Guangyi Zhou	0.04 s	Java	2025-02-06 11:09:32
2	Anthony Pagnotta	0.04 s	Java	2026-02-26 06:42:11
3	Finn Lidbetter	0.05 s	Java	2018-10-17 16:23:37
4	James Black	0.05 s	Java	2018-10-22 16:54:20
5	José Vander Meulen	0.05 s	Java	2018-10-23 16:40:59
6	Morgan K Bender	0.06 s	Java	2018-10-12 18:15:54
7	Lee Wei Hong	0.06 s	Java	2018-10-18 10:59:53
8	Jason Tomkins	0.06 s	Java	2018-10-19 00:54:04
9	Lexie Nance	0.06 s	Java	2018-10-19 04:36:25
10	Kyle Kelly	0.06 s	Java	2018-10-20 16:08:50

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	JavaScript (Node.js)	2025-01-25 21:42:09
2	Thomas Harmeyer	0.09 s	JavaScript (Node.js)	2022-11-13 15:15:45
3	Jay Cruz	0.09 s	JavaScript (Node.js)	2023-05-07 11:13:16
4	Peter Kedemo	0.42 s	JavaScript (Node.js)	2020-01-01 12:49:12
5	John	0.42 s	JavaScript (Node.js)	2020-07-27 12:13:24
6	Minh Phúc Lê	0.42 s	JavaScript (Node.js)	2020-08-08 17:43:57
7	Hovhannes Kantuni	0.42 s	JavaScript (Node.js)	2020-09-02 19:56:05
8	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-04 09:28:43
9	Chris Wong	0.42 s	JavaScript (Node.js)	2021-02-07 13:32:01
10	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-02-13 14:13:08

#	User	Runtime	Language	Date
1	Håkan Lindahl	0.02 s	JavaScript (SpiderMonkey)	2022-06-16 22:58:49
2	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2018-10-19 18:22:58
3	Jeremy Loh	0.03 s	JavaScript (SpiderMonkey)	2019-01-04 16:28:46
4	Casey Smith	0.03 s	JavaScript (SpiderMonkey)	2019-05-28 16:57:13
5	Nicklas Utgaard	0.03 s	JavaScript (SpiderMonkey)	2019-10-31 20:07:01
6	Rolands	0.03 s	JavaScript (SpiderMonkey)	2020-05-31 16:15:56
7	Zachary DeStefano	0.03 s	JavaScript (SpiderMonkey)	2020-09-04 03:23:45
8	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-03-10 20:52:27
9	Christian Pilegaard Cederquist	0.03 s	JavaScript (SpiderMonkey)	2022-11-15 23:51:27
10	Zach Tschetter	0.03 s	JavaScript (SpiderMonkey)	2023-07-04 04:45:16

#	User	Runtime	Language	Date
1	Timothy Gaede	0.59 s	Julia	2024-06-14 04:02:05

#	User	Runtime	Language	Date
1	Ashish Singh	0.13 s	Kotlin	2023-01-28 07:42:18
2	Hidden user	0.14 s	Kotlin	2019-12-20 14:16:24
3	Johnny Baloney	0.15 s	Kotlin	2021-12-02 12:46:00
4	James WIlliams	0.17 s	Kotlin	2020-09-06 22:37:34
5	arda atci	0.19 s	Kotlin	2020-07-07 22:42:09
6	Zaw Myat	0.20 s	Kotlin	2024-01-15 03:26:45
7	Ola Sundell	0.21 s	Kotlin	2019-08-19 13:50:00
8	Sergey Jakobsen	0.21 s	Kotlin	2021-06-03 00:51:09
9	Neil Harmon	0.22 s	Kotlin	2019-04-09 15:59:09
10	Sarek Høverstad Skotåm	0.22 s	Kotlin	2020-10-10 21:16:25

#	User	Runtime	Language	Date
1	Shinji Koshida	0.00 s	Lua	2025-04-01 09:47:30

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2019-01-09 09:48:08
2	David Connolly	0.00 s	Pascal	2023-05-03 19:26:21

#	User	Runtime	Language	Date
1	Denis BAURAIN	0.01 s	Perl	2026-01-29 23:16:05

#	User	Runtime	Language	Date
1	Renate	0.01 s	PHP	2021-07-17 17:34:11
2	Andre Wahyudi	0.01 s	PHP	2022-10-26 03:34:51

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-08 09:05:21

#	User	Runtime	Language	Date
1	Haochen Chen	0.03 s	Python 2	2018-10-21 23:06:46
2	Johann Ly	0.03 s	Python 2	2018-10-30 07:16:55
3	Eric Törnqvist	0.03 s	Python 2	2018-12-17 22:57:53
4	Andrei Stoica	0.03 s	Python 2	2019-01-16 22:56:55
5	Johan Lyts	0.03 s	Python 2	2019-02-18 22:02:04
6	Martin Tran	0.03 s	Python 2	2019-03-23 18:28:05
7	Hidden user	0.03 s	Python 2	2019-07-01 18:29:33
8	Hasan Kalzi	0.03 s	Python 2	2022-06-18 11:44:03
9	Ciara Godwin	0.04 s	Python 2	2018-10-17 16:15:14
10	Andreas Eisele	0.04 s	Python 2	2018-10-20 00:39:29

#	User	Runtime	Language	Date
1	Graeme Zinck	0.02 s	Python 3	2018-10-12 17:14:26
2	Nigel Quinn	0.02 s	Python 3	2018-10-20 01:11:47
3	Peter Beattie	0.02 s	Python 3	2018-10-23 12:37:51
4	Kevin Chen	0.02 s	Python 3	2018-11-05 03:43:59
5	Łukasz Łukaszew	0.02 s	Python 3	2018-11-24 22:04:48
6	Jakob Kallestad	0.02 s	Python 3	2018-11-25 16:13:23
7	Jacob Raymond	0.02 s	Python 3	2018-11-27 20:19:52
8	Arnav Sastry	0.02 s	Python 3	2018-11-28 03:48:48
9	João Pedro Alvito	0.02 s	Python 3	2018-12-02 15:00:11
10	Manu Lam	0.02 s	Python 3	2018-12-08 19:29:21

#	User	Runtime	Language	Date
1	Macdara mac an tSionnaigh	0.04 s	Ruby	2019-09-15 16:49:39
2	Donald Dong	0.05 s	Ruby	2018-12-31 00:17:55
3	Hidden user	0.05 s	Ruby	2019-03-05 12:56:09
4	Miorel Palii	0.06 s	Ruby	2018-11-05 05:04:37
5	Thomas Feld	0.06 s	Ruby	2022-11-08 15:17:03
6	Russell Ng	0.07 s	Ruby	2025-06-06 14:51:41

#	User	Length	Language	Date
1	Danny Robinson	93	Bash	2023-09-30 07:29:37

#	User	Length	Language	Date
1	Benjamin Iserman	173	C	2023-02-28 20:32:21
2	Ximun Castoreo	442	C	2020-07-07 15:37:21
3	Jón Steinn Elíasson	475	C	2020-03-03 11:53:37
4	SAJEEDHA.M cse	475	C	2020-08-21 14:48:03
5	Sreelakshmi G	475	C	2020-08-22 19:19:42
6	Kiley Thomas	475	C	2021-03-30 10:37:00
7	Jakob Lundkvist	475	C	2022-04-10 22:14:38
8	Khoa Ngo Duc Minh	475	C	2025-08-24 06:28:20
9	Ilhame Ben-saghroune	476	C	2021-05-06 13:21:24
10	Carrot 2221	483	C	2020-12-09 09:46:20

#	User	Length	Language	Date
1	Chris McGarty	501	C#	2018-10-30 19:40:13
2	Göran Andersson	512	C#	2022-05-10 17:44:02
3	Martin Wallgren	590	C#	2018-11-28 09:14:02
4	Esty Crow	635	C#	2023-03-30 21:46:31
5	Thomas Norris	799	C#	2019-09-20 18:38:10
6	Anthony Ye	848	C#	2023-04-02 18:30:22
7	Anton J Olsson	904	C#	2020-06-11 02:45:00
8	Գոռ Բաղդասարյան	987	C#	2026-01-07 07:38:00
9	Eric Bäckhage	1091	C#	2019-02-15 21:51:10
10	Victor Hultén Mattsson	1109	C#	2022-06-20 11:33:34

#	User	Length	Language	Date
1	Anna Roczek	308	C++	2023-07-11 13:54:24
2	Jalvin Chan Jia Xiang	345	C++	2020-04-06 15:33:48
3	Hidden user	346	C++	2020-02-29 22:27:20
4	William Gan	349	C++	2018-12-04 13:55:29
5	Ritchie Goldwin	366	C++	2018-12-27 15:11:32
6	Markus Mathiasen	370	C++	2021-07-03 10:40:22
7	Jerome Leow	378	C++	2020-12-24 07:56:03
8	妹様万歳	380	C++	2020-03-23 15:06:27
9	Jordan Quah Shao Xuan	385	C++	2022-12-08 09:18:38
10	Austin Fernandez	387	C++	2019-08-03 19:11:19

#	User	Length	Language	Date
1	David Cawthon	524	Common Lisp	2019-04-13 03:22:54
2	Hidden user	576	Common Lisp	2019-05-25 06:10:51
3	Philippos Boon Alexaki	689	Common Lisp	2019-11-18 18:01:38
4	Hidden user	1170	Common Lisp	2019-01-08 13:20:00

#	User	Length	Language	Date
1	Sebastian Sternberg	571	F#	2021-08-25 19:01:50
2	Jacob Harris Cryer Kragh	766	F#	2022-06-27 17:26:59
3	Patrick Bahr	2098	F#	2021-02-21 22:20:51

#	User	Length	Language	Date
1	William Fiset	455	Go	2018-10-27 06:40:35
2	Patrik Lilja	647	Go	2018-11-15 19:15:21
3	Eric Martin	683	Go	2018-12-24 04:32:31
4	Conor McGovern	695	Go	2019-03-09 19:49:29
5	Krzysztof Gibuła	753	Go	2021-05-11 18:36:29
6	Norbert Voelker	831	Go	2021-04-15 21:38:04
7	Anmol Sharma	973	Go	2019-11-08 12:34:46
8	Felix Fatum	1244	Go	2022-09-26 13:48:16

#	User	Length	Language	Date
1	Sebastian Banert	265	Haskell	2024-07-04 22:02:58
2	Øyvind Almli	450	Haskell	2021-09-14 14:51:25
3	Hidden user	454	Haskell	2019-08-13 11:53:25
4	Li Jun	459	Haskell	2023-06-27 18:53:35
5	Fulano de Tal	507	Haskell	2022-01-20 04:02:18
6	Intrets	546	Haskell	2019-04-05 18:54:36
7	Shinji Koshida	555	Haskell	2025-03-28 09:19:57
8	Matthew Johnson	603	Haskell	2019-05-15 07:28:33
9	Brian Hwang	627	Haskell	2021-09-15 11:18:42
10	Mitchell Wright	629	Haskell	2020-02-19 18:53:22

#	User	Length	Language	Date
1	Duncan Page	472	Java	2019-03-04 23:42:10
2	Brennan Cleland	558	Java	2022-11-08 00:51:52
3	Caeden Whitaker	565	Java	2020-07-04 05:19:28
4	Kevin Kauffman	578	Java	2021-12-29 00:39:30
5	Sukhjot Singh	579	Java	2019-08-03 19:43:26
6	Carter Henderson	595	Java	2021-11-18 17:59:51
7	Christopher Stephens	618	Java	2022-11-13 00:46:43
8	Ali Pervaiz	634	Java	2019-03-19 22:12:47
9	Russell Rivard	647	Java	2021-05-12 22:28:17
10	Drew Isaacson	648	Java	2020-10-20 00:47:37

#	User	Length	Language	Date
1	Thomas Harmeyer	495	JavaScript (Node.js)	2022-11-13 15:15:45
2	Peter Kedemo	703	JavaScript (Node.js)	2020-01-01 12:49:12
3	Chris Wong	800	JavaScript (Node.js)	2021-02-07 13:32:01
4	Howard Tin Chi Chan	890	JavaScript (Node.js)	2021-02-13 14:13:08
5	Hidden user	931	JavaScript (Node.js)	2025-01-25 21:42:09
6	Hovhannes Kantuni	1001	JavaScript (Node.js)	2020-09-02 19:56:05
7	Andoko Chandra	1092	JavaScript (Node.js)	2020-10-04 09:28:43
8	John	1134	JavaScript (Node.js)	2020-07-27 12:13:24
9	Niamh Limerick	1189	JavaScript (Node.js)	2022-01-30 00:28:51
10	Minh Phúc Lê	1508	JavaScript (Node.js)	2020-08-08 17:43:57

#	User	Length	Language	Date
1	Jimmy Gustafsson	154	JavaScript (SpiderMonkey)	2024-07-12 22:03:21
2	Christian Pilegaard Cederquist	190	JavaScript (SpiderMonkey)	2022-11-15 23:51:27
3	Bjørn Chr. Soltvedt	296	JavaScript (SpiderMonkey)	2018-10-19 18:22:58
4	Peter Menyes	358	JavaScript (SpiderMonkey)	2021-03-10 20:52:27
5	Zachary DeStefano	405	JavaScript (SpiderMonkey)	2020-09-04 03:23:45
6	Zach Tschetter	408	JavaScript (SpiderMonkey)	2023-07-04 04:45:16
7	Casey Smith	575	JavaScript (SpiderMonkey)	2019-05-28 16:57:13
8	Nicklas Utgaard	659	JavaScript (SpiderMonkey)	2019-10-31 20:07:01
9	Håkan Lindahl	677	JavaScript (SpiderMonkey)	2022-06-16 22:58:49
10	Rolands	746	JavaScript (SpiderMonkey)	2020-05-31 16:15:56

#	User	Length	Language	Date
1	Timothy Gaede	534	Julia	2024-06-14 04:02:05

#	User	Length	Language	Date
1	Ashish Singh	506	Kotlin	2023-01-28 07:42:18
2	Sarek Høverstad Skotåm	615	Kotlin	2020-10-10 21:16:25
3	Troy Warmboe	627	Kotlin	2020-02-08 01:41:02
4	Hidden user	747	Kotlin	2019-11-14 21:21:45
5	arda atci	768	Kotlin	2020-07-07 22:42:09
6	Hidden user	854	Kotlin	2020-04-11 18:22:34
7	Hidden user	867	Kotlin	2019-12-20 14:16:24
8	Johnny Baloney	876	Kotlin	2021-12-02 12:46:00
9	Neil Harmon	943	Kotlin	2019-04-09 15:59:09
10	Zaw Myat	1001	Kotlin	2024-01-15 03:26:45

#	User	Length	Language	Date
1	Shinji Koshida	451	Lua	2025-04-01 09:47:30

#	User	Length	Language	Date
1	Ingemar Ragnemalm	583	Pascal	2019-01-09 09:48:08
2	David Connolly	1072	Pascal	2023-05-03 19:26:21

#	User	Length	Language	Date
1	Denis BAURAIN	304	Perl	2026-01-29 23:19:34

#	User	Length	Language	Date
1	Renate	603	PHP	2021-07-17 17:34:11
2	Andre Wahyudi	1106	PHP	2022-10-26 03:34:51

#	User	Length	Language	Date
1	Hakan Kjellerstrand	567	Prolog	2023-02-08 09:05:21

#	User	Length	Language	Date
1	Thomas Feld	165	Python 2	2019-08-29 16:15:47
2	Andreas Eisele	189	Python 2	2018-10-20 00:39:29
3	Lars Åström	225	Python 2	2019-11-13 22:03:34
4	Conor McCauley	242	Python 2	2019-11-01 01:58:18
5	Eric Törnqvist	243	Python 2	2018-12-17 22:57:53
6	Hidden user	271	Python 2	2019-07-13 13:27:12
7	Andreas Björklund	282	Python 2	2019-08-18 14:05:55
8	Jesper Öqvist	283	Python 2	2018-10-22 07:52:06
9	Max Holmberg	306	Python 2	2018-11-09 08:34:57
10	Martin Tran	306	Python 2	2019-03-23 18:28:05

#	User	Length	Language	Date
1	Nguyên Khôi Đỗ	109	Python 3	2025-06-01 17:42:44
2	Clement Oh	110	Python 3	2023-07-10 15:53:17
3	Benjamin Z White	132	Python 3	2023-04-01 09:48:08
4	Tai Tze Kin	138	Python 3	2024-05-05 12:00:31
5	Charles Ancheta	142	Python 3	2023-03-24 05:12:43
6	fecesman	148	Python 3	2019-11-11 23:59:11
7	Prateek Bhakta	153	Python 3	2019-03-21 22:59:41
8	Ahmed Chamseddine	162	Python 3	2024-07-16 17:11:01
9	Vedran Čačić	173	Python 3	2019-01-20 19:53:47
10	Shashank Bhatt	182	Python 3	2023-10-16 22:25:14

#	User	Length	Language	Date
1	Thomas Feld	86	Ruby	2022-11-08 15:17:03
2	Russell Ng	101	Ruby	2025-06-06 14:53:14
3	Hidden user	243	Ruby	2019-03-05 12:56:09
4	Miorel Palii	261	Ruby	2018-11-05 05:04:37
5	Donald Dong	334	Ruby	2018-12-31 00:17:55
6	Macdara mac an tSionnaigh	350	Ruby	2019-09-15 16:49:39

#	User	Length	Language	Date
1	Emil Dichmann	323	Rust	2025-10-01 18:46:41
2	Vincent Lagerros	545	Rust	2025-02-07 15:25:42
3	David Rasch	661	Rust	2020-09-11 11:15:56
4	Pankajkumar Patro	726	Rust	2024-12-17 21:57:02
5	David Zacek	763	Rust	2021-05-25 00:48:23
6	Ryan Mueller	785	Rust	2023-10-23 22:23:51
7	Henrik Josefsson	900	Rust	2025-07-18 15:36:44
8	Bas Dirks	902	Rust	2022-01-01 16:06:18
9	Brendan Jones	929	Rust	2020-06-13 10:30:48
10	Farooq Khan	970	Rust	2020-05-28 23:49:33

Solution running time distribution