Problem A
Bit by Bit — Problem Statistics

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Submissions	8923
Accepted submissions	2858
Submission ratio	32.03%
Authors	2650
Full solves [?]	2304
Full solve Ratio	86.94%

#	User	Runtime	Language	Date
1	Niklas Huss	0.02 s	C#	2015-09-30 19:49:11
2	Viktor Lindberg	0.02 s	C#	2016-05-04 17:45:11
3	Robert Low	0.02 s	C#	2016-08-12 22:50:17
4	Ugnius Skučas	0.02 s	C#	2016-10-15 14:27:54
5	Pavel Volgarev	0.02 s	C#	2016-11-15 02:46:32
6	Johnson Ho	0.02 s	C#	2016-11-20 21:04:25
7	Iwan	0.02 s	C#	2016-12-05 10:41:26
8	Hidden user	0.02 s	C#	2017-01-16 14:39:32
9	Adrian Reithaug	0.02 s	C#	2017-09-12 13:40:27
10	Vijaya Sekhar Gullapalli	0.02 s	C#	2017-12-07 13:51:59

#	User	Runtime	Language	Date
1	David Cawthon	0.01 s	Common Lisp	2020-07-07 01:40:41

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.03 s	F#	2023-04-05 16:01:28

#	User	Runtime	Language	Date
1	Mukhlas Rosyadi	0.00 s	Go	2023-11-13 05:08:00
2	Husain Satan	0.00 s	Go	2023-11-13 18:34:26
3	Pandhu Hutomo Aditya	0.00 s	Go	2023-11-14 12:14:01
4	Chris Rudolph	0.02 s	Go	2018-10-15 02:40:57
5	Schuyler Tay	0.02 s	Go	2020-05-06 11:15:58
6	James Robb	0.02 s	Go	2020-05-12 09:52:57
7	Krzysztof Gibuła	0.02 s	Go	2021-05-12 20:44:24
8	Erik Rairden	0.02 s	Go	2021-07-07 05:15:33
9	Norbert Voelker	0.02 s	Go	2021-07-29 22:34:29
10	Wei Wang	0.02 s	Go	2021-09-17 06:20:34

#	User	Runtime	Language	Date
1	Wilfried van Asten	0.00 s	Haskell	2015-12-19 19:29:49
2	Lars Tveito	0.01 s	Haskell	2015-07-30 21:00:54
3	Gustav NIlsson	0.01 s	Haskell	2015-12-12 17:29:58
4	Jan Hlavacek	0.01 s	Haskell	2016-11-20 01:14:12
5	Anthony Clays	0.01 s	Haskell	2017-01-17 10:51:16
6	Gaston Gilbert	0.01 s	Haskell	2017-09-20 07:48:57
7	Brent Yorgey	0.01 s	Haskell	2018-05-04 04:37:20
8	Rudi Svartveit	0.01 s	Haskell	2018-09-12 17:20:34
9	Erik Hesselink	0.01 s	Haskell	2020-04-22 12:43:25
10	Juan Miguel Vilar	0.01 s	Haskell	2020-09-16 14:25:38

#	User	Runtime	Language	Date
1	Samuel Klingström	0.05 s	Java	2017-06-07 17:02:19
2	Michael Sullivan	0.06 s	Java	2015-09-18 17:47:00
3	Trần Công Duy	0.06 s	Java	2015-11-18 04:11:45
4	Đỗ Duy Tân	0.06 s	Java	2015-11-18 05:21:45
5	Simon Xue	0.06 s	Java	2016-04-08 04:59:28
6	Dajo Hofman	0.06 s	Java	2016-09-25 11:56:53
7	Martijn Muijsers	0.06 s	Java	2016-11-01 20:48:44
8	Erik Baalhuis	0.06 s	Java	2017-08-26 19:59:15
9	Bjørn Dons	0.06 s	Java	2018-10-17 22:12:48
10	Sven Rönnbäck	0.06 s	Java	2022-01-22 08:02:33

#	User	Runtime	Language	Date
1	João Portugal	0.04 s	JavaScript (Node.js)	2024-08-13 10:01:06
2	Inês e Palma	0.04 s	JavaScript (Node.js)	2025-06-29 14:17:02
3	Faza Rida	0.05 s	JavaScript (Node.js)	2023-11-14 18:18:49
4	Diogo Guedes	0.05 s	JavaScript (Node.js)	2024-06-30 15:33:07
5	Miguel Silva	0.05 s	JavaScript (Node.js)	2024-07-10 23:25:40
6	Daniel Rocha	0.05 s	JavaScript (Node.js)	2024-07-11 17:22:23
7	Marcos Freitas	0.05 s	JavaScript (Node.js)	2025-03-21 09:20:36
8	Miikka Toivola	0.05 s	JavaScript (Node.js)	2025-06-19 11:47:58
9	Xavier Calhau	0.05 s	JavaScript (Node.js)	2025-10-09 18:12:46
10	Nils Asejevs	0.06 s	JavaScript (Node.js)	2019-04-18 11:36:18

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-21 15:23:30
2	Johannes Jensen	0.01 s	JavaScript (SpiderMonkey)	2016-03-06 13:18:14
3	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-07-28 23:25:34
4	Cole Rauh	0.01 s	JavaScript (SpiderMonkey)	2016-10-16 22:35:10
5	J M	0.01 s	JavaScript (SpiderMonkey)	2016-11-09 18:20:04
6	Tor Nordqvist	0.01 s	JavaScript (SpiderMonkey)	2016-11-10 13:08:28
7	Paul Leung	0.01 s	JavaScript (SpiderMonkey)	2017-08-31 12:32:15
8	Andri Rafn	0.01 s	JavaScript (SpiderMonkey)	2018-04-24 14:14:44
9	Simon Titkó	0.02 s	JavaScript (SpiderMonkey)	2024-02-05 19:41:43
10	Hidden user	0.03 s	JavaScript (SpiderMonkey)	2019-08-20 07:48:10

#	User	Runtime	Language	Date
1	Timothy Gaede	0.58 s	Julia	2024-06-06 04:22:37
2	Danny Robinson	0.96 s	Julia	2023-10-06 10:40:43

#	User	Runtime	Language	Date
1	Johnny Baloney	0.15 s	Kotlin	2022-01-06 20:21:38
2	Laksa Pedas	0.21 s	Kotlin	2023-11-13 10:13:19
3	Dayan Ruben Gonzalez	0.23 s	Kotlin	2020-10-05 17:11:05
4	Phường Lên	0.24 s	Kotlin	2019-10-25 21:16:43
5	Hidden user	0.25 s	Kotlin	2020-04-28 17:24:06
6	Adam Koprowski	0.26 s	Kotlin	2020-08-20 21:39:21
7	Adam Rankin	0.26 s	Kotlin	2023-09-22 15:55:23
8	Troels Bjerre Lund	0.27 s	Kotlin	2019-11-03 21:21:08
9	Mike Poland	0.28 s	Kotlin	2019-08-13 20:02:38
10	Eric Huynh	0.29 s	Kotlin	2019-02-02 04:54:26

#	User	Runtime	Language	Date
1	Erik K	0.00 s	OCaml	2020-09-27 08:30:15
2	Hidden user	0.00 s	OCaml	2024-01-21 22:50:11

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-08-29 07:17:02
2	David Connolly	0.00 s	Pascal	2022-04-15 15:55:22

#	User	Runtime	Language	Date
1	Javier Gómez Díaz	0.00 s	Perl	2025-07-25 17:41:41

#	User	Runtime	Language	Date
1	Ludvig Flink	0.01 s	PHP	2021-01-07 15:26:27
2	Raphael Lima	0.01 s	PHP	2024-07-03 21:02:07
3	Pedro Gaspar	0.01 s	PHP	2025-09-28 19:27:47
4	Emerson Nunes	0.01 s	PHP	2025-12-17 14:08:53

#	User	Runtime	Language	Date
1	Christofer Ohlsson	0.03 s	Python 2	2015-03-30 17:05:20
2	Tore Norderud	0.03 s	Python 2	2015-08-12 21:32:46
3	Asger Hautop Drewsen	0.03 s	Python 2	2015-11-21 01:52:46
4	Mark Snow	0.03 s	Python 2	2016-12-08 14:37:46
5	Mayank Makwana	0.03 s	Python 2	2017-09-21 02:52:17
6	Hermon Mulat	0.03 s	Python 2	2018-11-20 17:42:29
7	Hidden user	0.03 s	Python 2	2019-01-25 02:17:12
8	Justin Su	0.03 s	Python 2	2019-10-02 03:55:47
9	Arne Tobias Malkenes Ødegaard	0.04 s	Python 2	2015-11-12 18:54:48
10	Oskar Haarklou Veileborg	0.04 s	Python 2	2015-11-21 14:25:13

#	User	Runtime	Language	Date
1	James Elías Sigurðarson	0.02 s	Python 3	2015-06-19 21:43:21
2	Jack Rosenthal	0.02 s	Python 3	2015-11-23 03:42:31
3	Atli Fannar Franklín	0.02 s	Python 3	2016-04-01 12:53:08
4	Rick van Rheenen	0.02 s	Python 3	2016-04-22 16:19:40
5	Nathan Collins	0.02 s	Python 3	2016-07-11 13:56:45
6	Nicolas Marsceau	0.02 s	Python 3	2016-07-11 14:05:44
7	Christian Lindeström	0.02 s	Python 3	2016-09-22 03:36:36
8	Casper Freksen	0.02 s	Python 3	2016-10-01 00:26:47
9	Matthew Casserly	0.02 s	Python 3	2016-10-18 21:20:39
10	David Castelblanco Benavides	0.02 s	Python 3	2016-12-03 22:42:38

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-01-23 11:48:32
2	Love Engman	0.03 s	Ruby	2017-04-02 11:52:05
3	Macdara mac an tSionnaigh	0.04 s	Ruby	2019-11-04 21:41:45
4	Hidden user	0.05 s	Ruby	2019-01-14 20:17:55
5	Hasanuzzaman Sumon	0.05 s	Ruby	2021-01-02 18:32:35
6	Szymon Madeja	0.06 s	Ruby	2022-09-26 15:10:25
7	Thomas Feld	0.06 s	Ruby	2023-05-09 08:50:18
8	Fabian Levén	0.06 s	Ruby	2024-05-14 12:30:43
9	Patrick Elsen	0.07 s	Ruby	2019-04-27 13:08:45
10	Nils Olsson	0.07 s	Ruby	2024-02-07 13:00:20

#	User	Length	Language	Date
1	Bochuan Lu	1002	C	2017-04-29 18:30:55
2	Miguel Müller	1102	C	2017-11-30 14:10:30
3	Ryan Rodz	1222	C	2025-11-27 22:24:49
4	Hidden user	1226	C	2025-12-01 01:48:50
5	Zachariah Goldthorpe	1234	C	2017-08-12 03:20:13
6	Hidden user	1276	C	2017-11-24 17:00:28
7	Noah Ó Donnaile	1281	C	2017-03-14 21:09:50
8	Tiffany Pham	1282	C	2025-11-26 08:57:43
9	Rewan Saydo	1282	C	2025-11-30 21:30:31
10	Abdulrahman Mohammed-Ali	1287	C	2025-11-27 07:22:39

#	User	Length	Language	Date
1	Benjamin Iserman	1443	C#	2021-10-28 00:38:08
2	Jorge Antunes	1530	C#	2025-10-17 18:35:54
3	Johnson Ho	1701	C#	2016-11-20 21:04:25
4	Henrik Andersson	1785	C#	2018-10-27 22:43:27
5	Andreas Åhlfeldt	1835	C#	2019-09-18 14:16:05
6	David Olmårs	1862	C#	2021-01-13 14:08:37
7	Samee Mushtak	1971	C#	2021-03-07 02:02:49
8	Basile Van Hoorick	2052	C#	2019-09-14 17:47:45
9	Deivasigamani Mahalingam	2087	C#	2021-01-06 15:03:27
10	Viktor Lindberg	2161	C#	2016-05-04 17:45:11

#	User	Length	Language	Date
1	Frans Meulenbroeks	510	C++	2024-11-02 12:55:21
2	a_b__c	540	C++	2021-01-13 17:06:10
3	Thanh Bình Nguyễn	593	C++	2017-11-01 14:29:11
4	Đoàn Công Chính	627	C++	2019-01-02 06:38:17
5	Vu Duy Dung	639	C++	2017-11-01 14:50:02
6	Mugeon Kim	679	C++	2024-03-04 03:44:07
7	Manshant Singh Kohli	698	C++	2017-09-14 02:32:38
8	Matteo Zappia	710	C++	2021-11-05 13:43:28
9	Timothy White	716	C++	2021-09-12 14:25:57
10	14-Phạm Cao Gia Khang- 10A9	725	C++	2022-07-21 19:40:21

#	User	Length	Language	Date
1	David Cawthon	1312	Common Lisp	2020-07-07 01:40:41

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1945	F#	2023-04-05 16:01:28

#	User	Length	Language	Date
1	Aloysius Lee	1160	Go	2020-05-02 15:58:40
2	Krzysztof Gibuła	1213	Go	2021-05-12 20:44:24
3	Ainun Nazieb	1218	Go	2020-09-30 16:35:06
4	Erik Rairden	1260	Go	2021-07-07 05:02:07
5	Schuyler Tay	1282	Go	2020-05-06 12:03:41
6	Rajad	1538	Go	2021-12-13 11:43:25
7	Nicklesh	1538	Go	2021-12-13 11:45:05
8	Norbert Voelker	1587	Go	2021-07-29 22:34:29
9	Michael Laszlo	1598	Go	2016-10-19 12:52:25
10	James Robb	1704	Go	2020-04-27 22:00:27

#	User	Length	Language	Date
1	Anthony Clays	1166	Haskell	2017-01-17 10:51:16
2	Rudi Svartveit	1172	Haskell	2018-09-12 17:20:34
3	Lars Tveito	1203	Haskell	2015-07-30 21:00:54
4	Joshua Coward	1372	Haskell	2021-12-12 02:45:58
5	Gustav NIlsson	1494	Haskell	2015-12-12 17:29:58
6	Jan Hlavacek	1607	Haskell	2016-11-20 01:14:12
7	Steinar Simonnes	1649	Haskell	2025-03-08 20:31:29
8	Jan Hrček	1829	Haskell	2021-04-14 04:56:40
9	Erik Hesselink	1907	Haskell	2020-04-22 12:43:25
10	Brent Yorgey	2095	Haskell	2018-05-04 04:37:20

#	User	Length	Language	Date
1	Doug Goodman	842	Java	2017-09-05 21:45:22
2	Rasmus Poulsen	859	Java	2024-02-05 21:20:34
3	Elizabeth Zou	1015	Java	2018-08-11 17:44:52
4	Duncan Page	1030	Java	2017-11-21 22:20:19
5	Jason Liu	1082	Java	2023-08-25 02:23:32
6	Jiru Xu	1099	Java	2017-09-18 23:50:37
7	Diana Bishop	1100	Java	2018-08-31 16:10:04
8	Soldà Federico	1106	Java	2020-03-03 22:31:01
9	Nils Olsson	1109	Java	2021-02-27 21:23:54
10	Hidden user	1126	Java	2022-01-15 09:24:09

#	User	Length	Language	Date
1	Hidden user	1220	JavaScript (Node.js)	2021-01-02 05:25:03
2	Miguel Silva	1434	JavaScript (Node.js)	2024-07-10 23:25:40
3	Perumalla Kutumba Pavan Kumar	1435	JavaScript (Node.js)	2021-02-15 13:59:25
4	Nils Asejevs	1502	JavaScript (Node.js)	2019-04-18 11:36:18
5	Inês e Palma	1526	JavaScript (Node.js)	2025-06-29 14:17:02
6	João Portugal	1716	JavaScript (Node.js)	2024-08-13 10:01:06
7	Miikka Toivola	1751	JavaScript (Node.js)	2025-06-19 11:47:58
8	Vidhi Kotecha	1818	JavaScript (Node.js)	2021-04-02 07:13:43
9	lisa	1921	JavaScript (Node.js)	2021-09-18 11:00:00
10	Viva Coder	1927	JavaScript (Node.js)	2021-09-15 18:29:28

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	692	JavaScript (SpiderMonkey)	2016-07-28 23:25:34
2	Christian Pilegaard Cederquist	738	JavaScript (SpiderMonkey)	2023-05-27 12:02:20
3	Cole Rauh	816	JavaScript (SpiderMonkey)	2016-10-16 22:35:10
4	Paul Leung	881	JavaScript (SpiderMonkey)	2017-08-31 12:32:15
5	Peter Kedemo	987	JavaScript (SpiderMonkey)	2015-12-21 15:23:30
6	J M	1040	JavaScript (SpiderMonkey)	2016-11-09 18:20:04
7	Johannes Jensen	1046	JavaScript (SpiderMonkey)	2016-03-06 13:18:14
8	Hidden user	1347	JavaScript (SpiderMonkey)	2019-08-20 07:48:10
9	Zach Tschetter	1386	JavaScript (SpiderMonkey)	2023-06-30 03:27:50
10	Simon Titkó	1451	JavaScript (SpiderMonkey)	2024-02-05 19:41:43

#	User	Length	Language	Date
1	Danny Robinson	284	Julia	2023-10-06 10:40:43
2	Timothy Gaede	1819	Julia	2024-06-06 04:22:37

#	User	Length	Language	Date
1	Adam Koprowski	1024	Kotlin	2020-08-20 21:39:21
2	Phường Lên	1066	Kotlin	2019-10-25 21:16:43
3	Laksa Pedas	1280	Kotlin	2023-11-13 10:13:00
4	Dayan Ruben Gonzalez	1352	Kotlin	2020-10-05 17:11:05
5	Jonathan Soo	1384	Kotlin	2019-06-21 09:12:23
6	Johnny Baloney	1479	Kotlin	2022-01-06 20:26:32
7	Hidden user	1646	Kotlin	2020-04-28 17:24:06
8	Eric Huynh	1719	Kotlin	2019-02-02 04:54:26
9	Nuno Silva	1794	Kotlin	2025-09-30 08:01:09
10	Troels Bjerre Lund	1841	Kotlin	2019-11-03 21:33:46

#	User	Length	Language	Date
1	Hidden user	1882	OCaml	2024-01-21 22:50:11
2	Erik K	3864	OCaml	2020-09-27 08:30:15

#	User	Length	Language	Date
1	David Connolly	1901	Pascal	2022-04-15 15:55:22
2	Ingemar Ragnemalm	2284	Pascal	2018-08-29 07:17:02

#	User	Length	Language	Date
1	Javier Gómez Díaz	827	Perl	2025-07-25 17:41:41

#	User	Length	Language	Date
1	Ludvig Flink	1421	PHP	2021-01-07 15:26:27
2	Emerson Nunes	1667	PHP	2025-12-17 14:08:53
3	Pedro Gaspar	1686	PHP	2025-09-28 19:27:47
4	Raphael Lima	1955	PHP	2024-07-03 21:02:07

#	User	Length	Language	Date
1	Thomas Feld	430	Python 2	2019-09-06 08:11:29
2	Asger Hautop Drewsen	536	Python 2	2015-11-21 01:52:46
3	Haggai Liu	547	Python 2	2017-04-25 07:29:49
4	Neal Zane	619	Python 2	2015-12-06 00:27:40
5	Hidden user	638	Python 2	2019-10-28 16:35:12
6	Gurinder Hans	672	Python 2	2017-09-10 06:33:38
7	Arnav Aggarwal	707	Python 2	2020-07-24 14:32:19
8	Dangely Jeanelle	708	Python 2	2017-10-08 21:13:14
9	Oskar Haarklou Veileborg	757	Python 2	2015-11-21 14:25:13
10	Justin Su	760	Python 2	2019-10-02 03:55:47

#	User	Length	Language	Date
1	Tobias Glimmerfors	190	Python 3	2023-07-19 22:05:40
2	Elias Lundell	212	Python 3	2023-07-19 20:38:49
3	Michael Goldwasser	319	Python 3	2024-09-05 04:56:48
4	Harry Zhang	325	Python 3	2023-07-19 10:51:54
5	Benjamin Z White	343	Python 3	2023-03-31 21:44:10
6	Erik Bryland	394	Python 3	2023-07-19 21:53:32
7	Charles Ancheta	401	Python 3	2023-03-24 08:08:04
8	Ahmed Chamseddine	427	Python 3	2024-12-03 20:08:02
9	Simon Titkó	456	Python 3	2024-02-06 23:58:15
10	David Ludwig	501	Python 3	2017-12-04 00:28:14

#	User	Length	Language	Date
1	Thomas Feld	162	Ruby	2023-05-09 08:56:14
2	Hidden user	754	Ruby	2019-01-14 20:17:55
3	Currie Pariñas	826	Ruby	2025-08-09 14:01:22
4	Casper Christensen	873	Ruby	2016-01-23 11:48:32
5	August Holm	967	Ruby	2025-11-20 19:12:24
6	Mark Daniel Soriano	979	Ruby	2025-12-21 09:28:54
7	Fabian Levén	991	Ruby	2024-05-14 12:30:43
8	Macdara mac an tSionnaigh	1110	Ruby	2019-11-04 21:41:45
9	Nils Olsson	1144	Ruby	2024-02-07 13:00:20
10	Leska Ti	1183	Ruby	2025-02-23 08:31:05

#	User	Length	Language	Date
1	Artur Khuziakhmetov	1374	Rust	2022-08-10 08:53:44
2	Robert Janczewski	1490	Rust	2020-02-06 14:48:21
3	Bas Dirks	1987	Rust	2022-01-23 23:20:21
4	Ishtiaq Hussain Naqi	2219	Rust	2023-09-15 06:19:39
5	Hidden user	2299	Rust	2023-04-22 10:34:36
6	Eric Pinter	2331	Rust	2021-06-26 04:37:04
7	Danial Haseeb	2549	Rust	2023-09-11 04:58:42
8	Reis Faar	2562	Rust	2023-05-25 13:48:58
9	Joe Blower	3010	Rust	2025-10-23 00:21:05
10	Spencer Killen	3086	Rust	2020-04-30 03:40:23

Solution running time distribution