Problem A
Yin and Yang Stones — Problem Statistics

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Submissions	4839
Accepted submissions	2884
Submission ratio	59.60%
Authors	2714
Full solves [?]	2516
Full solve Ratio	92.70%

#	User	Runtime	Language	Date
1	Danny Robinson	0.02 s	Bash	2023-09-26 12:08:08
2	Thomas Feld	0.06 s	Bash	2023-09-27 14:13:37
3	Chenzhang Hu	0.06 s	Bash	2023-09-30 16:47:57

#	User	Runtime	Language	Date
1	Simon Snygg	0.02 s	C#	2017-05-12 10:43:11
2	Max Bågling	0.02 s	C#	2017-05-31 21:16:06
3	Hidden user	0.02 s	C#	2017-06-19 18:23:41
4	Khin Nyunt	0.02 s	C#	2017-10-02 09:04:13
5	Faisal Rahman	0.02 s	C#	2017-11-03 12:24:44
6	Kunwei Zhang	0.02 s	C#	2018-02-15 09:01:40
7	Johan Pettersson	0.02 s	C#	2018-04-27 00:02:56
8	Jahurul Satvik	0.02 s	C#	2019-03-31 17:55:38
9	Andreas Åhlfeldt	0.02 s	C#	2019-12-27 15:13:58
10	Carl Eriksson	0.02 s	C#	2020-01-15 13:49:27

#	User	Runtime	Language	Date
1	David Cawthon	0.01 s	Common Lisp	2020-09-13 07:42:33

#	User	Runtime	Language	Date
1	Patrick Bahr	0.04 s	F#	2021-02-20 16:35:36

#	User	Runtime	Language	Date
1	Krzysztof Gibuła	0.08 s	Go	2021-03-25 19:01:26
2	Norbert Voelker	0.08 s	Go	2021-04-07 00:37:04
3	Suka Isnaini	0.11 s	Go	2023-12-17 07:45:09
4	dick move	0.22 s	Go	2021-05-30 21:03:00
5	Jack Kryger Sørensen	0.22 s	Go	2022-01-02 14:36:32
6	Robertus Bagaskara	0.23 s	Go	2022-04-18 18:53:37

#	User	Runtime	Language	Date
1	Sebastian Banert	0.00 s	Haskell	2023-10-05 23:23:26
2	Steinar Simonnes	0.00 s	Haskell	2024-01-31 10:33:51
3	Matthew A Johnson	0.01 s	Haskell	2017-04-26 04:38:03
4	Martin Jackson	0.01 s	Haskell	2017-04-29 03:23:52
5	Olle Eriksson	0.01 s	Haskell	2017-11-20 17:25:24
6	Daniel German	0.01 s	Haskell	2018-06-30 22:13:42
7	Jannik Olbrich	0.01 s	Haskell	2019-04-26 07:07:41
8	Isaac Arvestad	0.01 s	Haskell	2019-05-30 12:28:20
9	Tines J. Valen	0.01 s	Haskell	2019-09-16 17:36:37
10	Flocon de Son	0.01 s	Haskell	2020-06-08 08:07:25

#	User	Runtime	Language	Date
1	Lincoln Craddock	0.04 s	Java	2025-09-09 20:17:46
2	Alexander Fetisov	0.06 s	Java	2017-04-15 19:07:53
3	Kensen Shi	0.06 s	Java	2017-04-15 19:16:32
4	Mitchell Peterson	0.06 s	Java	2017-04-15 19:18:16
5	Ethan Bainbridge	0.06 s	Java	2017-04-15 19:19:14
6	Orlando Rodriguez Hernandez	0.06 s	Java	2017-04-15 19:59:47
7	Nedim Husovic	0.06 s	Java	2017-04-15 20:18:18
8	Finn Lidbetter	0.06 s	Java	2017-04-19 21:20:58
9	Micah Stairs	0.06 s	Java	2017-04-19 22:52:35
10	Aron Bergman	0.06 s	Java	2017-04-24 09:22:26

#	User	Runtime	Language	Date
1	Elias Murcray	0.05 s	JavaScript (Node.js)	2025-10-24 23:51:12
2	Pedro Dantas	0.06 s	JavaScript (Node.js)	2019-02-28 03:07:19
3	Sander Hellesø	0.07 s	JavaScript (Node.js)	2019-04-14 02:02:15
4	Hidden user	0.10 s	JavaScript (Node.js)	2022-11-23 20:17:28
5	Woo Kang	0.43 s	JavaScript (Node.js)	2020-09-14 07:30:52
6	Chris Wong	0.43 s	JavaScript (Node.js)	2021-02-15 15:50:40
7	Adam Kohl	0.43 s	JavaScript (Node.js)	2021-03-13 10:25:26
8	Khin Nyunt	0.43 s	JavaScript (Node.js)	2021-12-11 15:50:24
9	Andoko Chandra	0.44 s	JavaScript (Node.js)	2020-10-08 21:33:01
10	John	0.44 s	JavaScript (Node.js)	2021-03-10 04:22:13

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2017-04-22 20:29:42
2	Davíð Helgason	0.01 s	JavaScript (SpiderMonkey)	2017-08-07 22:09:14
3	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-11 11:52:02
4	Muhammetnur Gurbanmyradow	0.02 s	JavaScript (SpiderMonkey)	2024-09-14 17:30:18
5	Peter Kedemo	0.03 s	JavaScript (SpiderMonkey)	2017-07-04 23:55:44
6	Nicklas Utgaard	0.03 s	JavaScript (SpiderMonkey)	2021-04-24 15:01:15
7	Christian Pilegaard Cederquist	0.03 s	JavaScript (SpiderMonkey)	2023-01-08 02:07:07
8	Zach Tschetter	0.03 s	JavaScript (SpiderMonkey)	2023-06-14 23:06:34
9	Jimmy Gustafsson	0.03 s	JavaScript (SpiderMonkey)	2024-07-08 20:58:18

#	User	Runtime	Language	Date
1	Timothy Gaede	0.47 s	Julia	2024-04-02 05:57:25

#	User	Runtime	Language	Date
1	Benjamin Laurence Erickson	0.15 s	Kotlin	2019-09-17 23:13:48
2	Mike Wilkes	0.22 s	Kotlin	2018-02-11 20:13:46
3	Gaurav Tyagi	0.22 s	Kotlin	2018-11-21 23:51:14
4	Adam Rankin	0.23 s	Kotlin	2023-04-22 19:56:56
5	Jahid Hasan Imon	0.25 s	Kotlin	2020-05-22 22:24:22
6	Simon Lixenfeld	0.25 s	Kotlin	2021-06-11 23:07:28
7	Sergey Jakobsen	0.27 s	Kotlin	2021-03-14 22:40:43
8	Troy Warmboe	0.27 s	Kotlin	2021-10-11 22:40:09
9	Neil Harmon	0.28 s	Kotlin	2019-04-19 12:05:00
10	Dmitry Shostak	0.28 s	Kotlin	2019-09-23 08:34:34

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.01 s	Lua	2023-11-14 23:29:33

#	User	Runtime	Language	Date
1	Evan Magill	0.00 s	OCaml	2023-10-27 17:42:40

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-09-01 22:18:31

#	User	Runtime	Language	Date
1	Trevor	0.02 s	Perl	2024-02-19 20:48:11
2	Ali	0.02 s	Perl	2024-05-15 16:15:58

#	User	Runtime	Language	Date
1	Susanne Ragnemalm	0.01 s	PHP	2018-03-17 20:22:10
2	Hidden user	0.01 s	PHP	2019-03-27 17:41:55
3	Renate Fiala-Lundström	0.01 s	PHP	2021-05-11 01:30:34
4	陳建宏	0.01 s	PHP	2021-06-21 17:46:31
5	Andre Wahyudi	0.01 s	PHP	2023-03-14 10:54:32

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.05 s	Prolog	2023-02-23 23:43:41
2	Andriy Zyevakov	0.09 s	Prolog	2017-07-04 19:09:39

#	User	Runtime	Language	Date
1	Ethan Arnold	0.02 s	Python 2	2017-04-15 19:09:40
2	Sala Gabriel	0.02 s	Python 2	2017-04-24 19:11:39
3	Tomas Alvarez	0.02 s	Python 2	2017-05-08 22:37:51
4	Erin Birkwood	0.02 s	Python 2	2017-06-15 22:21:49
5	Johan Wind	0.02 s	Python 2	2017-06-25 21:03:26
6	Cliodhna Harrison	0.02 s	Python 2	2017-08-04 15:11:20
7	Çağdaş Öztekin	0.02 s	Python 2	2017-08-29 07:40:54
8	Kristmundur Agust	0.02 s	Python 2	2017-10-07 02:28:02
9	Frederik Højholt	0.02 s	Python 2	2017-10-23 17:05:01
10	Dangely Jeanelle	0.02 s	Python 2	2017-11-02 00:09:16

#	User	Runtime	Language	Date
1	Caleb Bryant	0.02 s	Python 3	2017-04-15 19:07:00
2	Eric Williamson	0.02 s	Python 3	2017-04-15 19:14:47
3	Sam Henry	0.02 s	Python 3	2017-04-15 19:16:23
4	Lionel KITIHOUN	0.02 s	Python 3	2017-04-15 19:36:45
5	Chinmay Viraj Raut	0.02 s	Python 3	2017-04-15 19:42:36
6	Christopher Nathaniel Walker	0.02 s	Python 3	2017-04-15 20:54:36
7	Kevin Wang	0.02 s	Python 3	2017-04-15 21:19:16
8	Ram Basnet	0.02 s	Python 3	2017-04-19 20:48:42
9	James Hamm	0.02 s	Python 3	2017-04-21 03:01:05
10	Денис Соболев	0.02 s	Python 3	2017-04-22 14:56:56

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	Ruby	2021-02-13 02:40:22
2	Thomas Feld	0.06 s	Ruby	2022-11-10 12:50:47
3	Noah Hessen Bjerke	0.06 s	Ruby	2022-11-30 21:44:11
4	Hakan Kjellerstrand	0.06 s	Ruby	2023-03-17 10:47:16
5	Eugen Neagoe	0.06 s	Ruby	2023-04-27 01:18:02
6	Chenzhang Hu	0.06 s	Ruby	2023-09-19 19:42:26
7	Hidden user	0.07 s	Ruby	2019-04-01 10:45:59
8	Russell Ng	0.07 s	Ruby	2025-05-26 02:15:50

#	User	Length	Language	Date
1	Chenzhang Hu	37	Bash	2025-09-13 02:18:01
2	Thomas Feld	41	Bash	2023-09-27 14:13:37
3	Danny Robinson	63	Bash	2023-09-26 12:25:11

#	User	Length	Language	Date
1	Atul Anand	170	C	2017-06-21 14:55:36
2	Matthew Weston	176	C	2022-01-19 15:45:30
3	Sebastian Hosbond	209	C	2020-11-02 13:13:00
4	Daniel Nivon	209	C	2023-04-20 21:51:11
5	4A09 Hui Wan 4A09 許運	227	C	2020-03-03 11:39:24
6	David Hinschberger	228	C	2018-11-05 05:26:52
7	Hidden user	231	C	2017-11-20 08:49:23
8	Mikayla Tejada	231	C	2019-12-18 00:50:32
9	Hidden user	231	C	2020-09-09 13:04:40
10	Hidden user	233	C	2020-03-15 12:02:48

#	User	Length	Language	Date
1	Gregory Sinclair	203	C#	2023-10-28 06:04:32
2	Kunwei Zhang	217	C#	2018-02-15 09:01:40
3	Esty Crow	256	C#	2024-07-19 12:42:30
4	Göran Andersson	257	C#	2022-05-12 22:27:31
5	Thomas Norris	372	C#	2020-11-14 22:00:34
6	Khin Nyunt	375	C#	2017-10-02 09:04:13
7	Maykal Droshev	395	C#	2021-02-17 10:17:25
8	Andreas Åhlfeldt	437	C#	2019-12-27 15:13:58
9	Hidden user	456	C#	2017-06-19 18:23:41
10	Vicky Irmawan	485	C#	2020-07-22 04:27:38

#	User	Length	Language	Date
1	鹿目圆	156	C++	2019-02-11 03:53:41
2	Mohammad Sadeghi	160	C++	2019-07-11 13:39:02
3	Markus Mathiasen	167	C++	2021-05-05 16:54:25
4	Darcy Best	169	C++	2026-03-11 19:23:09
5	Frederick Pek	179	C++	2021-06-04 09:20:07
6	Sunny Nguyen	188	C++	2018-10-06 06:04:32
7	Marco Servin	191	C++	2020-07-09 00:34:22
8	Đậu Huy Minh	191	C++	2022-10-17 18:15:13
9	Đoàn Anh Tuấn	192	C++	2020-04-11 17:37:20
10	Austin Tsai	193	C++	2025-09-07 05:48:15

#	User	Length	Language	Date
1	David Cawthon	271	Common Lisp	2020-09-13 07:42:33

#	User	Length	Language	Date
1	Patrick Bahr	1808	F#	2021-02-20 16:35:36

#	User	Length	Language	Date
1	Suka Isnaini	212	Go	2023-12-17 07:45:09
2	dick move	224	Go	2021-05-30 21:03:00
3	Jack Kryger Sørensen	241	Go	2022-01-02 14:36:32
4	Robertus Bagaskara	290	Go	2022-04-18 18:53:37
5	Krzysztof Gibuła	391	Go	2021-03-25 19:01:26
6	Norbert Voelker	497	Go	2021-04-07 00:37:04

#	User	Length	Language	Date
1	Jannik Olbrich	90	Haskell	2019-04-26 07:07:41
2	Tines J. Valen	116	Haskell	2019-09-16 17:36:37
3	Matthew A Johnson	134	Haskell	2017-04-26 04:38:03
4	Olle Eriksson	137	Haskell	2017-11-20 17:25:24
5	Brandon Tang	175	Haskell	2023-05-19 22:02:43
6	David Zacek	182	Haskell	2021-05-11 03:00:42
7	Martin Jackson	184	Haskell	2017-04-29 03:23:52
8	Isaac Arvestad	186	Haskell	2019-05-30 12:28:20
9	Stefan Kennedy	187	Haskell	2017-12-07 19:29:42
10	Hidden user	189	Haskell	2017-08-22 22:10:02

#	User	Length	Language	Date
1	Lincoln Craddock	154	Java	2025-09-09 20:54:49
2	William White	236	Java	2017-04-15 23:41:32
3	Kyle Toom	291	Java	2020-02-20 17:45:47
4	Kevin Kauffman	292	Java	2022-01-02 22:52:36
5	Doug Goodman	312	Java	2018-06-18 23:52:32
6	Timothy Buzzelli	317	Java	2017-04-15 19:05:09
7	Ryan Kelsey	329	Java	2017-04-15 19:10:32
8	Qritel Abdelilah	331	Java	2017-04-30 00:49:09
9	Pedro Contipelli	333	Java	2017-05-08 17:49:02
10	Mohamed Lmoussaoui	335	Java	2017-04-15 19:25:29

#	User	Length	Language	Date
1	Elias Murcray	193	JavaScript (Node.js)	2025-10-24 23:51:12
2	Hidden user	332	JavaScript (Node.js)	2022-11-23 20:17:28
3	Pedro Dantas	370	JavaScript (Node.js)	2019-02-28 03:07:19
4	Chris Wong	420	JavaScript (Node.js)	2021-02-15 15:50:40
5	Woo Kang	532	JavaScript (Node.js)	2020-09-14 07:30:52
6	Sander Hellesø	575	JavaScript (Node.js)	2019-04-14 02:02:15
7	Khin Nyunt	603	JavaScript (Node.js)	2021-12-11 15:50:24
8	dtaylor6306@gmail.com	621	JavaScript (Node.js)	2021-03-07 20:45:28
9	Adam Kohl	673	JavaScript (Node.js)	2021-03-13 10:25:26
10	Andoko Chandra	831	JavaScript (Node.js)	2020-10-08 21:33:01

#	User	Length	Language	Date
1	Jimmy Gustafsson	66	JavaScript (SpiderMonkey)	2024-07-08 20:58:18
2	Zach Tschetter	98	JavaScript (SpiderMonkey)	2023-06-14 23:06:34
3	Bjørn Chr. Soltvedt	152	JavaScript (SpiderMonkey)	2017-04-22 20:29:42
4	Christian Pilegaard Cederquist	161	JavaScript (SpiderMonkey)	2023-01-08 02:07:07
5	Davíð Helgason	175	JavaScript (SpiderMonkey)	2017-08-07 22:09:14
6	Peter Kedemo	214	JavaScript (SpiderMonkey)	2017-07-04 23:55:44
7	Nicklas Utgaard	411	JavaScript (SpiderMonkey)	2021-04-24 15:01:15
8	Muhammetnur Gurbanmyradow	412	JavaScript (SpiderMonkey)	2024-09-14 17:30:18
9	Peter Menyes	440	JavaScript (SpiderMonkey)	2017-08-11 11:52:02

#	User	Length	Language	Date
1	Timothy Gaede	214	Julia	2024-04-02 05:09:04

#	User	Length	Language	Date
1	Nicholas Johnson	100	Kotlin	2020-02-17 01:28:06
2	Sergey Jakobsen	119	Kotlin	2021-03-14 22:40:43
3	Dmitry Shostak	152	Kotlin	2019-09-23 08:34:34
4	Simon Lixenfeld	178	Kotlin	2021-06-11 23:07:28
5	Einar Kjellback	180	Kotlin	2019-12-08 23:16:50
6	Jahid Hasan Imon	210	Kotlin	2020-05-22 22:24:22
7	Troy Warmboe	225	Kotlin	2021-10-11 22:40:09
8	Benjamin Laurence Erickson	320	Kotlin	2019-09-17 23:13:48
9	Adam Rankin	373	Kotlin	2023-04-22 19:56:56
10	Gaurav Tyagi	505	Kotlin	2018-11-21 23:51:14

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	360	Lua	2023-11-14 23:29:33

#	User	Length	Language	Date
1	Evan Magill	285	OCaml	2023-10-27 17:42:40

#	User	Length	Language	Date
1	Ingemar Ragnemalm	269	Pascal	2018-09-01 22:18:31

#	User	Length	Language	Date
1	Ali	146	Perl	2024-05-15 16:15:58
2	Trevor	276	Perl	2024-02-19 20:48:11

#	User	Length	Language	Date
1	Renate Fiala-Lundström	127	PHP	2021-05-11 01:30:34
2	Susanne Ragnemalm	237	PHP	2018-03-17 20:22:10
3	陳建宏	252	PHP	2021-06-21 17:46:31
4	Andre Wahyudi	356	PHP	2023-03-14 10:54:32
5	Hidden user	552	PHP	2019-03-27 17:41:55

#	User	Length	Language	Date
1	Hakan Kjellerstrand	103	Prolog	2023-03-17 11:35:21
2	Andriy Zyevakov	261	Prolog	2017-07-04 19:09:39

#	User	Length	Language	Date
1	Thomas Feld	52	Python 2	2019-08-23 10:10:17
2	Johan Wind	56	Python 2	2017-06-25 21:03:26
3	Michael van der Kamp	64	Python 2	2018-03-23 04:26:18
4	David Brewster	65	Python 2	2017-04-15 21:06:18
5	Yanmarshus Bachtiar	69	Python 2	2020-10-15 01:55:39
6	Winston Luo	71	Python 2	2017-04-15 19:22:31
7	Lars Åström	72	Python 2	2018-11-19 09:36:03
8	Justin Su	75	Python 2	2019-10-02 01:34:13
9	Catalin Popa	76	Python 2	2019-01-03 20:24:29
10	Ethan Arnold	80	Python 2	2017-04-15 19:09:40

#	User	Length	Language	Date
1	Clement Oh	41	Python 3	2023-05-14 13:09:31
2	Daniel Bogorad	41	Python 3	2026-03-13 17:46:43
3	Harry Zhang	42	Python 3	2022-12-19 11:12:50
4	Evan Carr	42	Python 3	2023-12-29 01:43:20
5	Shashank Bhatt	42	Python 3	2024-07-24 03:57:21
6	Kévin Dubrulle	43	Python 3	2024-11-11 11:43:26
7	Sacha De Mulder	43	Python 3	2026-01-21 15:53:24
8	Jesper Bech Christensen	44	Python 3	2022-10-25 12:59:34
9	Hidden user	44	Python 3	2022-11-22 19:42:38
10	Josh Taylor	44	Python 3	2023-06-22 20:39:46

#	User	Length	Language	Date
1	Chenzhang Hu	29	Ruby	2024-04-14 07:35:10
2	Russell Ng	29	Ruby	2025-05-26 02:15:50
3	Thomas Feld	32	Ruby	2022-11-10 12:51:48
4	Hakan Kjellerstrand	41	Ruby	2023-03-17 10:47:16
5	Hidden user	54	Ruby	2021-02-13 02:40:22
6	Noah Hessen Bjerke	69	Ruby	2022-11-30 21:44:11
7	Eugen Neagoe	88	Ruby	2023-04-27 01:18:02
8	Hidden user	115	Ruby	2019-04-01 10:45:59

#	User	Length	Language	Date
1	Vincent Lagerros	281	Rust	2025-09-17 13:46:15
2	Pankajkumar Patro	300	Rust	2024-10-21 18:28:10
3	Hidden user	331	Rust	2026-01-12 19:08:33
4	Shivam Thakur	346	Rust	2019-06-26 23:07:40
5	David Rasch	364	Rust	2022-10-19 11:49:09
6	Hidden user	411	Rust	2021-02-25 13:15:57
7	Isak Jägberg	465	Rust	2024-10-21 12:56:46
8	Freek van Keulen	467	Rust	2021-07-21 18:09:26
9	Bas Dirks	484	Rust	2022-01-02 12:26:23
10	Kok Dith	544	Rust	2021-08-07 15:53:17

Solution running time distribution