Problem A
Alien Numbers — Problem Statistics

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Submissions	6255
Accepted submissions	3105
Submission ratio	49.64%
Authors	3190
Full solves [?]	2764
Full solve Ratio	86.65%

#	User	Runtime	Language	Date
1	John Nowaka	0.02 s	C#	2014-09-23 15:45:04
2	Chris St. John	0.02 s	C#	2014-10-04 03:08:33
3	masosz	0.02 s	C#	2015-01-19 20:03:11
4	Mads Storm Hansen	0.02 s	C#	2015-07-18 10:09:12
5	Andriy Zyevakov	0.02 s	C#	2015-09-08 18:54:24
6	Sam Broughton	0.02 s	C#	2015-09-25 11:36:46
7	Robert Low	0.02 s	C#	2016-08-12 16:19:27
8	Daniel Angulo Sanchez	0.02 s	C#	2016-11-23 05:41:44
9	Khin Nyunt	0.02 s	C#	2016-12-26 17:13:30
10	Hidden user	0.02 s	C#	2017-04-20 21:01:24

#	User	Runtime	Language	Date
1	Patrik Nyman	0.01 s	Common Lisp	2022-09-08 23:25:29
2	David Cawthon	0.02 s	Common Lisp	2019-04-11 01:39:56

#	User	Runtime	Language	Date
1	Kalle Johansson	0.02 s	Dart	2023-07-21 17:31:00

#	User	Runtime	Language	Date
1	Mughees Warraich	0.54 s	Elixir	2025-05-16 06:23:27

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.05 s	F#	2022-09-24 10:58:37
2	Morten Clausen	0.06 s	F#	2020-12-27 19:27:49
3	Evgeniy Sharapov	0.07 s	F#	2021-06-17 06:57:55

#	User	Runtime	Language	Date
1	Haw Jia	0.00 s	Go	2024-06-11 15:12:11
2	Nathan Lee	0.00 s	Go	2025-08-28 18:25:13
3	Manuel Kohnen	0.01 s	Go	2023-11-03 10:08:05
4	Thomas	0.01 s	Go	2024-01-16 20:00:40
5	Yousif Ibrahim	0.01 s	Go	2024-02-05 14:58:00
6	Nischal Bhandari	0.01 s	Go	2025-05-16 22:16:05
7	Vijaya Sekhar Gullapalli	0.02 s	Go	2019-03-28 13:22:23
8	Dhitiwat Jongsuebchoke	0.02 s	Go	2019-06-10 02:19:39
9	Ian Howell	0.02 s	Go	2019-09-05 23:56:55
10	Sergejs Podolaks	0.03 s	Go	2023-03-29 08:58:39

#	User	Runtime	Language	Date
1	Simon Klein	0.06 s	Java	2011-10-26 17:37:02
2	Erik Odenman	0.06 s	Java	2011-10-26 17:41:50
3	Johan Sannemo	0.06 s	Java	2011-11-04 14:28:47
4	Jens Ståhl	0.06 s	Java	2011-11-30 16:13:48
5	Daniel Bernstein	0.06 s	Java	2011-12-19 08:54:47
6	Björn Löfroth	0.06 s	Java	2012-09-19 18:50:25
7	Michael Fu	0.06 s	Java	2013-10-11 20:55:33
8	Yang Zhou	0.06 s	Java	2013-10-11 21:50:29
9	Robert Wenger	0.06 s	Java	2013-10-11 22:27:58
10	James McCorriston	0.06 s	Java	2013-10-11 23:40:04

#	User	Runtime	Language	Date
1	Hallvard Braaten	0.06 s	JavaScript (Node.js)	2019-04-06 17:14:30
2	Dag Jomar Mersland	0.06 s	JavaScript (Node.js)	2019-04-06 19:19:09
3	Samuel Högfeldt	0.08 s	JavaScript (Node.js)	2022-08-05 12:08:57
4	Nikola Stojkovski	0.08 s	JavaScript (Node.js)	2022-08-12 11:34:47
5	Luca Favini	0.08 s	JavaScript (Node.js)	2023-08-25 17:39:02
6	Brandon Alejandro Mosqueda González	0.09 s	JavaScript (Node.js)	2023-03-13 11:20:39
7	Chris Wong	0.41 s	JavaScript (Node.js)	2021-03-16 20:54:52
8	Khin Nyunt	0.42 s	JavaScript (Node.js)	2021-08-21 17:29:53

#	User	Runtime	Language	Date
1	Anton Klarén	0.01 s	JavaScript (SpiderMonkey)	2014-09-05 18:08:11
2	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2016-01-09 08:24:59
3	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-21 19:43:06
4	Tor Nordqvist	0.01 s	JavaScript (SpiderMonkey)	2016-10-24 18:40:15
5	Mira Feiring	0.01 s	JavaScript (SpiderMonkey)	2017-09-27 22:39:00
6	Graham Fairweather	0.01 s	JavaScript (SpiderMonkey)	2017-10-06 17:46:50
7	Ionel Hindorean	0.02 s	JavaScript (SpiderMonkey)	2017-03-16 19:47:00
8	Sean Patel	0.02 s	JavaScript (SpiderMonkey)	2018-05-21 21:08:47
9	Danny Hidayat	0.02 s	JavaScript (SpiderMonkey)	2023-10-24 09:45:03
10	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2025-07-01 00:17:58

#	User	Runtime	Language	Date
1	Konrad Pettersson	0.67 s	Julia	2024-06-07 23:20:10
2	Hidden user	0.69 s	Julia	2023-10-29 07:06:50
3	Danny Robinson	0.72 s	Julia	2023-09-03 09:08:25
4	Timothy Gaede	0.75 s	Julia	2024-05-15 17:57:52

#	User	Runtime	Language	Date
1	Nicholas Johnson	0.13 s	Kotlin	2021-02-27 00:49:09
2	Jacob Huebner	0.17 s	Kotlin	2020-04-05 09:17:56
3	Adam Rankin	0.18 s	Kotlin	2023-05-10 04:07:53
4	Sam Keyser	0.18 s	Kotlin	2023-08-26 17:53:39
5	Bradley Richards	0.19 s	Kotlin	2023-03-06 09:12:50
6	Filip Belik	0.20 s	Kotlin	2019-10-24 03:39:53
7	Jesper Bech Christensen	0.20 s	Kotlin	2023-09-29 13:43:27
8	Neil Harmon	0.21 s	Kotlin	2019-08-29 16:01:51
9	Martijn Polderman	0.21 s	Kotlin	2021-02-08 16:53:43
10	Jesse van der Pluijm	0.21 s	Kotlin	2021-02-08 17:15:09

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.00 s	Lua	2023-11-15 15:02:04

#	User	Runtime	Language	Date
1	Benjamin Valdez	0.00 s	OCaml	2024-02-09 19:54:52
2	Marko Ristic	0.00 s	OCaml	2024-05-03 07:26:39

#	User	Runtime	Language	Date
1	David Connolly	0.00 s	Pascal	2019-01-30 14:52:04

#	User	Runtime	Language	Date
1	Renate	0.01 s	PHP	2023-06-19 23:32:43
2	Przemysław Kaczmarczyk	0.01 s	PHP	2024-05-17 19:38:08

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.03 s	Prolog	2023-03-13 20:20:18

#	User	Runtime	Language	Date
1	Johan Sannemo	0.03 s	Python 2	2012-01-22 02:01:25
2	Patrik Berggren	0.03 s	Python 2	2012-02-29 21:34:27
3	Hidden user	0.03 s	Python 2	2012-10-10 23:09:23
4	Hidden user	0.03 s	Python 2	2013-10-01 17:22:04
5	Ehsan Kia	0.03 s	Python 2	2013-10-11 20:32:54
6	Anthony Blackman	0.03 s	Python 2	2013-10-11 21:52:26
7	Jakob Bergendahl	0.03 s	Python 2	2013-11-12 16:41:01
8	Eivind Fonn	0.03 s	Python 2	2014-10-07 13:46:22
9	Martin Vonheim Larsen	0.03 s	Python 2	2014-12-01 19:00:25
10	Jacob Wejendorp	0.03 s	Python 2	2014-12-29 23:29:19

#	User	Runtime	Language	Date
1	Neil Girdhar	0.02 s	Python 3	2013-10-11 22:49:00
2	Brian Harrington	0.02 s	Python 3	2014-09-15 00:34:41
3	Francisco Couzo	0.02 s	Python 3	2014-10-27 06:45:57
4	Hidden user	0.02 s	Python 3	2014-11-21 23:15:33
5	Igor Brecelj	0.02 s	Python 3	2014-12-14 10:09:43
6	James Elías Sigurðarson	0.02 s	Python 3	2015-03-01 00:23:49
7	Martin Stensgård	0.02 s	Python 3	2015-03-15 02:08:58
8	Alex Loiko	0.02 s	Python 3	2015-05-18 20:12:54
9	Johannes Agestam	0.02 s	Python 3	2015-06-15 15:37:45
10	Johannes Westlund	0.02 s	Python 3	2015-11-04 21:31:38

#	User	Runtime	Language	Date
1	Addison Bean	0.03 s	Ruby	2017-11-01 23:14:00
2	Erik Rydbert	0.03 s	Ruby	2017-11-13 09:09:04
3	Oleg Smelov	0.04 s	Ruby	2019-02-23 22:47:28
4	Hidden user	0.05 s	Ruby	2019-02-28 12:38:38
5	Kok Dith	0.05 s	Ruby	2021-08-23 05:24:14
6	Alexander Bilde Pedersen	0.06 s	Ruby	2023-05-04 17:10:22
7	Thomas Feld	0.06 s	Ruby	2023-05-17 14:45:28
8	Trường Đặng	0.07 s	Ruby	2024-06-17 16:19:26

#	User	Runtime	Language	Date
1	Vincent Buchner	0.04 s	TypeScript	2025-05-15 18:46:05
2	Shulei Wang	0.05 s	TypeScript	2025-05-16 23:19:27

#	User	Runtime	Language	Date
1	Oleksii Ihnatenko	0.00 s	Zig	2024-02-19 20:57:54

#	User	Length	Language	Date
1	Dan Kral	695	C	2014-11-29 21:18:36
2	Nhật Anh Võ Nguyễn	729	C	2016-03-08 15:49:55
3	潘哲軒	734	C	2023-03-16 10:43:02
4	Hidden user	749	C	2024-01-02 21:05:13
5	klimisnotmilk	783	C	2023-07-20 10:51:45
6	Jonas Höglund	881	C	2014-01-06 01:33:39
7	Thành Hưng	906	C	2016-03-08 05:52:07
8	Matthew Weston	910	C	2022-02-28 16:29:02
9	Nguyễn Hoàng	933	C	2016-03-08 18:33:03
10	Chu Quoc Quan	941	C	2016-06-19 06:00:14

#	User	Length	Language	Date
1	Tom Stocker	555	C#	2024-07-15 20:30:57
2	Esty Crow	651	C#	2025-05-23 13:27:03
3	Aiden Bilyeu	664	C#	2023-02-01 04:31:15
4	clarence chen	676	C#	2025-05-30 18:21:15
5	Thomas Norris	689	C#	2019-11-04 19:51:48
6	Göran Andersson	759	C#	2022-05-17 21:04:10
7	Eamonn Lye	793	C#	2017-11-26 07:44:23
8	Henrik Andersson	996	C#	2018-10-30 13:52:41
9	Aaron Michael	1014	C#	2023-08-22 19:21:12
10	Hidden user	1063	C#	2024-01-15 11:34:28

#	User	Length	Language	Date
1	Asger Hautop Drewsen	396	C++	2015-10-01 18:27:51
2	Yeung Man Tsung	399	C++	2022-12-01 07:38:05
3	Antonio Molina Lovett	404	C++	2016-08-07 10:11:10
4	Herman Karlsson	412	C++	2015-05-16 15:30:12
5	Nickir Tay	414	C++	2018-01-27 15:52:13
6	dimas bayu	415	C++	2024-02-09 16:49:28
7	Jayden Wong	426	C++	2023-09-14 23:01:01
8	Vu Minh Duc	453	C++	2023-07-19 11:17:46
9	Johan Wind	475	C++	2015-09-18 17:09:35
10	Colin Bowen	483	C++	2015-11-25 21:04:57

#	User	Length	Language	Date
1	David Cawthon	922	Common Lisp	2019-04-11 01:39:56
2	Patrik Nyman	928	Common Lisp	2022-09-08 23:25:29

#	User	Length	Language	Date
1	Kalle Johansson	1154	Dart	2023-07-21 17:31:00

#	User	Length	Language	Date
1	Mughees Warraich	1395	Elixir	2025-05-16 06:23:27

#	User	Length	Language	Date
1	Morten Clausen	1209	F#	2020-12-27 19:27:49
2	Jacob Harris Cryer Kragh	1429	F#	2022-09-24 10:58:37
3	Evgeniy Sharapov	1799	F#	2021-06-17 06:57:55

#	User	Length	Language	Date
1	Sergejs Podolaks	703	Go	2023-03-29 08:58:39
2	Nischal Bhandari	824	Go	2025-05-16 22:16:05
3	Thomas	850	Go	2024-01-16 20:00:40
4	Vijaya Sekhar Gullapalli	864	Go	2019-03-28 13:22:23
5	Ian Howell	894	Go	2019-09-05 23:56:55
6	Dhitiwat Jongsuebchoke	1011	Go	2019-06-10 02:19:39
7	Yousif Ibrahim	1090	Go	2024-02-05 14:58:00
8	Hidden user	1110	Go	2021-05-26 14:01:32
9	Gustav Larsson	1283	Go	2013-10-31 00:00:31
10	Ciarán Ó hAoláin	1284	Go	2017-10-31 23:16:26

#	User	Length	Language	Date
1	David Wärn	413	Haskell	2015-05-03 20:57:42
2	Udo Stenzel	475	Haskell	2024-06-04 11:14:23
3	Charley Sheaffer	707	Haskell	2023-11-10 19:46:10
4	Brent Yorgey	735	Haskell	2017-10-13 13:47:51
5	Antony Lee	740	Haskell	2017-08-08 19:47:15
6	Jan Hrček	766	Haskell	2021-03-13 17:35:21
7	Joel Gärtner	771	Haskell	2015-04-17 22:01:35
8	Paul Brauner	829	Haskell	2023-06-27 12:09:08
9	姚锦铭	841	Haskell	2017-08-16 19:40:01
10	Patrik Lilja	900	Haskell	2016-10-18 23:46:50

#	User	Length	Language	Date
1	Thuriya Thwin	566	Java	2016-10-25 16:15:48
2	Hidden user	610	Java	2016-11-09 16:59:02
3	Eamonn Lye	694	Java	2017-11-10 01:39:22
4	Hidden user	695	Java	2015-06-22 20:57:08
5	Antonio Blanca	722	Java	2023-02-02 06:10:45
6	Ada Clevinger	726	Java	2018-06-14 15:12:29
7	Cleopatra	728	Java	2016-05-27 18:01:21
8	Andrew J. Zimmer	734	Java	2016-11-05 09:07:12
9	Tyler Drake	745	Java	2017-07-10 17:49:23
10	Hidden user	757	Java	2018-01-29 17:13:38

#	User	Length	Language	Date
1	Nikola Stojkovski	566	JavaScript (Node.js)	2022-08-12 11:34:47
2	Chris Wong	899	JavaScript (Node.js)	2021-03-16 20:54:52
3	Luca Favini	963	JavaScript (Node.js)	2023-08-25 17:39:02
4	Samuel Högfeldt	1079	JavaScript (Node.js)	2022-08-05 12:08:57
5	Khin Nyunt	1122	JavaScript (Node.js)	2021-08-21 17:29:53
6	Hallvard Braaten	1132	JavaScript (Node.js)	2019-04-06 17:14:30
7	Brandon Alejandro Mosqueda González	1322	JavaScript (Node.js)	2023-03-13 11:20:39
8	Dag Jomar Mersland	3740	JavaScript (Node.js)	2019-04-06 19:19:09

#	User	Length	Language	Date
1	Jimmy Gustafsson	194	JavaScript (SpiderMonkey)	2025-07-01 00:17:58
2	Christian Cederquist	497	JavaScript (SpiderMonkey)	2023-01-16 16:56:10
3	Mira Feiring	566	JavaScript (SpiderMonkey)	2017-09-27 22:39:00
4	Zach Tschetter	734	JavaScript (SpiderMonkey)	2024-07-13 02:37:28
5	Tor Nordqvist	765	JavaScript (SpiderMonkey)	2016-10-24 18:40:15
6	Danny Hidayat	784	JavaScript (SpiderMonkey)	2023-10-24 09:45:03
7	Peter Kedemo	804	JavaScript (SpiderMonkey)	2016-01-09 08:24:59
8	Bjørn Chr. Soltvedt	852	JavaScript (SpiderMonkey)	2016-02-21 19:43:06
9	Graham Fairweather	911	JavaScript (SpiderMonkey)	2017-10-06 17:46:50
10	Kiril	1013	JavaScript (SpiderMonkey)	2019-10-13 20:01:51

#	User	Length	Language	Date
1	Danny Robinson	162	Julia	2023-09-03 09:08:25
2	Konrad Pettersson	469	Julia	2024-06-07 23:41:32
3	Hidden user	684	Julia	2023-10-29 07:06:50
4	Timothy Gaede	1263	Julia	2024-05-15 17:57:52

#	User	Length	Language	Date
1	Jesper Bech Christensen	550	Kotlin	2023-09-29 13:46:07
2	Troels Bjerre Lund	614	Kotlin	2019-11-10 22:53:04
3	Chris Johnson	756	Kotlin	2024-11-01 21:56:29
4	Adam Koprowski	821	Kotlin	2021-07-13 21:54:57
5	Sam Keyser	833	Kotlin	2023-08-26 17:53:39
6	Jacob Huebner	965	Kotlin	2020-04-05 09:17:56
7	Bradley Richards	1064	Kotlin	2023-03-06 09:12:50
8	Dayan Ruben Gonzalez	1119	Kotlin	2020-10-05 23:02:21
9	Filip Belik	1256	Kotlin	2019-10-24 03:39:53
10	Adam Rankin	1471	Kotlin	2023-05-10 04:07:53

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	1056	Lua	2023-11-15 15:02:04

#	User	Length	Language	Date
1	Marko Ristic	1145	OCaml	2024-05-03 07:26:39
2	Benjamin Valdez	1154	OCaml	2024-02-09 19:54:52

#	User	Length	Language	Date
1	David Connolly	3883	Pascal	2019-01-30 14:52:04

#	User	Length	Language	Date
1	Przemysław Kaczmarczyk	1362	PHP	2024-05-17 19:38:08
2	Renate	1997	PHP	2023-06-19 23:32:43

#	User	Length	Language	Date
1	Hakan Kjellerstrand	754	Prolog	2023-03-13 20:20:18

#	User	Length	Language	Date
1	Anthony Blackman	256	Python 2	2013-10-11 21:52:26
2	Mehdi Maick	278	Python 2	2016-08-23 18:52:45
3	Thomas Feld	278	Python 2	2019-08-27 15:09:01
4	Meher Béjaoui	290	Python 2	2017-09-26 00:19:12
5	Ethan Paffe	298	Python 2	2019-10-07 19:54:10
6	Neal Zane	305	Python 2	2015-12-13 07:26:16
7	Johan Sannemo	334	Python 2	2012-01-22 02:01:25
8	Çağdaş Öztekin	348	Python 2	2017-09-08 11:43:41
9	Jakob Bergendahl	352	Python 2	2013-11-12 16:41:01
10	Andreas Björklund	361	Python 2	2019-03-16 10:46:08

#	User	Length	Language	Date
1	Chris Kopp	155	Python 3	2023-11-19 04:44:57
2	Lawry Sorenson	161	Python 3	2025-06-01 04:05:54
3	Alan Zhou	173	Python 3	2025-03-01 08:04:22
4	Charles Ancheta	191	Python 3	2023-03-16 08:49:34
5	AMHAOUCH Younes	197	Python 3	2019-09-15 16:16:37
6	Thomas Draper	203	Python 3	2023-03-19 01:20:58
7	Bo Stokes	221	Python 3	2024-04-26 08:33:55
8	Johan Degn	232	Python 3	2023-07-19 16:09:43
9	Kenneth Jensen	237	Python 3	2021-07-20 16:24:06
10	Victor Song	247	Python 3	2021-11-21 23:54:44

#	User	Length	Language	Date
1	Thomas Feld	125	Ruby	2023-05-17 14:53:48
2	Hidden user	294	Ruby	2019-02-28 12:38:38
3	Alexander Bilde Pedersen	385	Ruby	2023-05-04 17:10:22
4	Addison Bean	458	Ruby	2017-11-01 23:14:00
5	Kok Dith	531	Ruby	2021-08-23 05:24:14
6	Oleg Smelov	613	Ruby	2019-02-23 22:47:28
7	Erik Rydbert	751	Ruby	2017-11-13 09:09:04
8	Trường Đặng	942	Ruby	2024-06-17 16:19:26

#	User	Length	Language	Date
1	Hidden user	932	Rust	2023-09-17 16:46:11
2	Pankajkumar Patro	996	Rust	2025-06-15 00:45:27
3	Vincent Lagerros	1052	Rust	2024-12-29 05:14:50
4	Morgan Hopkins	1064	Rust	2019-03-18 06:04:13
5	Andreas Oppebøen	1089	Rust	2023-08-16 21:24:28
6	Robert Janczewski	1092	Rust	2020-02-09 11:37:09
7	David Rasch	1102	Rust	2020-10-21 13:50:02
8	Simon Hallefält	1197	Rust	2023-06-22 17:53:52
9	Haruki Moriguchi	1210	Rust	2019-04-24 19:54:45
10	Mathias Magnusson	1227	Rust	2018-12-07 19:26:52

#	User	Length	Language	Date
1	Shulei Wang	1446	TypeScript	2025-05-16 23:19:27
2	Vincent Buchner	1848	TypeScript	2025-05-15 18:46:05

#	User	Length	Language	Date
1	Oleksii Ihnatenko	1709	Zig	2024-02-19 20:57:54

Solution running time distribution