Problem A
This Ain't Your Grandpa's Checkerboard — Problem Statistics

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Submissions	4763
Accepted submissions	2423
Submission ratio	50.87%
Authors	2262
Full solves [?]	2093
Full solve Ratio	92.53%

#	User	Runtime	Language	Date
1	Michael Palkovics	0.02 s	C#	2019-11-18 16:16:48
2	Muhammed Edip Okur	0.02 s	C#	2019-11-19 07:09:13
3	Johan Pettersson	0.02 s	C#	2019-11-19 16:39:00
4	Wendel Fabian Chinsamy	0.02 s	C#	2019-11-21 11:16:42
5	Rasmus Leyes	0.02 s	C#	2019-11-23 18:02:27
6	Thomas Norris	0.02 s	C#	2019-11-25 16:07:08
7	Sebastian Gielinger	0.02 s	C#	2019-11-27 10:56:03
8	Julian Brandt	0.02 s	C#	2019-11-28 20:56:17
9	Garway Mei	0.02 s	C#	2019-11-29 21:15:46
10	권의현	0.02 s	C#	2019-12-03 00:12:12

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Common Lisp	2020-01-19 04:12:41
2	David Cawthon	0.01 s	Common Lisp	2020-06-22 04:12:56

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.04 s	F#	2022-07-14 09:57:44

#	User	Runtime	Language	Date
1	Norbert Voelker	0.08 s	Go	2021-04-22 13:54:25
2	Resa Renaldy	0.08 s	Go	2021-07-13 05:38:13
3	Sergey Jakobsen	0.08 s	Go	2022-02-03 23:39:16

#	User	Runtime	Language	Date
1	Caden Haustein	0.00 s	Haskell	2023-04-21 19:26:36
2	Mason Barnhill	0.00 s	Haskell	2023-10-23 17:16:44
3	Steinar Simonnes	0.00 s	Haskell	2024-01-30 15:52:54
4	Sebastian Banert	0.00 s	Haskell	2024-06-16 13:59:29
5	Brent Yorgey	0.01 s	Haskell	2019-11-15 19:15:34
6	Hidden user	0.01 s	Haskell	2019-11-16 14:31:34
7	Aurélien Pepin	0.01 s	Haskell	2019-11-20 11:18:30
8	Johan Adamsson	0.01 s	Haskell	2020-02-18 20:45:11
9	Jan Hrček	0.01 s	Haskell	2020-11-05 19:06:06
10	Caleb Surovik	0.01 s	Haskell	2021-07-02 20:48:49

#	User	Runtime	Language	Date
1	Ragna María Sverrisdóttir	0.04 s	Java	2025-01-21 22:50:27
2	Jason Oliphant	0.05 s	Java	2024-04-12 04:03:28
3	Ku Brian	0.05 s	Java	2024-05-08 05:11:16
4	Lim Zhan Hong	0.06 s	Java	2020-05-22 05:37:02
5	Ryan Lee Ting Zhern	0.06 s	Java	2020-05-23 02:25:02
6	Hidden user	0.06 s	Java	2020-06-03 21:35:27
7	Theodoric Keith Lim	0.06 s	Java	2020-06-07 08:52:23
8	Jannik We	0.06 s	Java	2020-06-09 16:55:08
9	Igor Trúchlik	0.06 s	Java	2020-06-13 10:38:03
10	Samuel Klingström	0.06 s	Java	2020-06-17 20:12:17

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	JavaScript (Node.js)	2024-09-13 20:44:10
2	Peter Kedemo	0.41 s	JavaScript (Node.js)	2019-12-21 16:11:49
3	Chris Wong	0.42 s	JavaScript (Node.js)	2021-02-16 23:05:56
4	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-02-17 08:58:15
5	Logan Emmert	0.42 s	JavaScript (Node.js)	2021-03-06 09:55:19
6	John	0.42 s	JavaScript (Node.js)	2021-04-08 11:30:46
7	Andoko Chandra	0.43 s	JavaScript (Node.js)	2020-10-08 22:43:24

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-15 14:02:22
2	Evan Magill	0.02 s	JavaScript (SpiderMonkey)	2024-06-11 03:54:29
3	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-06-17 21:39:21
4	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2019-11-17 11:16:11
5	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-08-22 20:27:56

#	User	Runtime	Language	Date
1	Timothy Gaede	0.65 s	Julia	2024-03-26 03:27:45
2	Danny Robinson	0.91 s	Julia	2023-09-05 09:46:59

#	User	Runtime	Language	Date
1	Marit van Dijk	0.16 s	Kotlin	2021-09-17 14:36:10
2	Adam Rankin	0.17 s	Kotlin	2023-08-26 01:43:04
3	Caden G	0.18 s	Kotlin	2019-11-18 17:09:03
4	Paul Kelley	0.18 s	Kotlin	2019-11-18 17:16:22
5	Filip Belik	0.18 s	Kotlin	2019-11-20 19:07:13
6	Phường Lên	0.19 s	Kotlin	2019-11-19 06:19:48
7	Hidden user	0.20 s	Kotlin	2019-11-19 13:07:14
8	Einar Kjellback	0.20 s	Kotlin	2019-11-28 15:12:16
9	Troy Warmboe	0.23 s	Kotlin	2020-02-09 00:18:55
10	Chris Johnson	0.26 s	Kotlin	2025-01-29 22:52:31

#	User	Runtime	Language	Date
1	Matthew Lutze	0.00 s	OCaml	2020-05-20 02:30:54

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2019-11-20 15:57:26

#	User	Runtime	Language	Date
1	Connor Billings	0.01 s	PHP	2020-01-03 05:10:41
2	Peter Kvick	0.01 s	PHP	2020-01-23 01:59:42
3	Renate	0.01 s	PHP	2021-06-19 22:43:47

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.02 s	Prolog	2024-08-07 17:45:51
2	Hakan Kjellerstrand	0.03 s	Prolog	2023-02-05 19:36:13

#	User	Runtime	Language	Date
1	Eric Williamson	0.03 s	Python 2	2019-11-11 04:32:53
2	Justin Su	0.03 s	Python 2	2019-11-16 10:22:25
3	Hugo Nissar	0.03 s	Python 2	2019-11-16 13:54:47
4	Ram Basnet	0.03 s	Python 2	2019-11-17 00:28:39
5	Johan Lyts	0.03 s	Python 2	2019-11-17 14:15:07
6	Kevin _	0.03 s	Python 2	2019-11-18 19:40:56
7	Jesper Öqvist	0.03 s	Python 2	2019-11-19 14:34:13
8	Thomas Feld	0.03 s	Python 2	2019-11-26 10:59:48
9	Sigurður Jens Albertsson	0.03 s	Python 2	2019-11-26 22:14:10
10	Mukerem Ali Nur	0.03 s	Python 2	2019-11-27 07:50:31

#	User	Runtime	Language	Date
1	Nick Breems	0.02 s	Python 3	2019-11-10 01:26:24
2	Godmar Back	0.02 s	Python 3	2019-11-10 15:49:12
3	April Chao	0.02 s	Python 3	2019-11-15 19:14:24
4	Sebastian Boldsen Jakobsen	0.02 s	Python 3	2019-11-15 20:30:43
5	William Lynch	0.02 s	Python 3	2019-11-15 20:33:57
6	Steffen Andrè Grønmo	0.02 s	Python 3	2019-11-15 21:07:09
7	Jacob Fahy	0.02 s	Python 3	2019-11-15 21:52:05
8	Bjørn Dons	0.02 s	Python 3	2019-11-15 21:54:40
9	Ron Sprenkels	0.02 s	Python 3	2019-11-15 23:19:08
10	Christofer Ohlsson	0.02 s	Python 3	2019-11-15 23:24:32

#	User	Runtime	Language	Date
1	Macdara mac an tSionnaigh	0.04 s	Ruby	2019-11-26 02:40:30
2	Hidden user	0.04 s	Ruby	2019-11-30 21:21:39
3	Miorel Palii	0.05 s	Ruby	2019-12-01 21:12:39
4	Thomas Feld	0.06 s	Ruby	2022-11-17 15:05:16

#	User	Length	Language	Date
1	Martin Blom	339	C	2024-01-07 00:32:58
2	Bergur Snorrason	660	C	2024-01-17 09:20:49
3	Ximun Castoreo	854	C	2020-02-13 16:27:35
4	PhilCampbell	873	C	2021-01-07 17:17:39
5	Hidden user	875	C	2019-12-04 13:14:00
6	Aileen Zhu	987	C	2020-02-23 17:52:37
7	Mirel Cosulschi	1053	C	2025-02-27 14:49:28
8	Joakim Skoog	1062	C	2019-12-11 19:40:19
9	Emil Wihlander	1064	C	2020-12-05 08:13:42
10	Sambit Palit	1095	C	2020-10-13 20:04:11

#	User	Length	Language	Date
1	Thomas Norris	882	C#	2019-11-25 16:07:08
2	Göran Andersson	1031	C#	2022-05-14 15:26:42
3	Garway Mei	1086	C#	2019-11-29 21:15:46
4	Muhammed Edip Okur	1412	C#	2019-11-19 07:09:13
5	Rasmus Leyes	1511	C#	2019-11-23 18:02:27
6	Wendel Fabian Chinsamy	1827	C#	2019-11-21 11:16:42
7	Thien Do	1829	C#	2020-02-14 17:27:08
8	Simon Lundqvist	1895	C#	2020-02-05 20:42:59
9	Benjamin Bilbeau	1925	C#	2024-08-16 21:06:55
10	Magnus Sjöberg	2083	C#	2020-01-14 10:46:40

#	User	Length	Language	Date
1	Jaxon Ballentine	351	C++	2025-06-18 22:08:56
2	Tyler Fernando	352	C++	2022-11-21 10:55:02
3	妹様万歳	571	C++	2020-01-19 03:37:28
4	Alan Bright	580	C++	2024-11-18 14:35:34
5	1中二病怪胎	583	C++	2021-12-22 13:37:47
6	Ritul Kumar Singh	598	C++	2024-04-27 10:32:14
7	WU DI	604	C++	2022-12-07 14:30:09
8	Dmitry Lyubshin	604	C++	2023-03-20 06:13:36
9	justin LI	607	C++	2025-09-03 15:54:07
10	Evan Michael Bailey	621	C++	2024-02-23 16:57:42

#	User	Length	Language	Date
1	Hidden user	1175	Common Lisp	2020-01-19 04:12:41
2	David Cawthon	1477	Common Lisp	2020-06-22 04:12:56

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1044	F#	2022-07-14 09:57:44

#	User	Length	Language	Date
1	Sergey Jakobsen	870	Go	2022-02-03 23:41:33
2	Norbert Voelker	1411	Go	2021-04-22 13:58:25
3	Resa Renaldy	1462	Go	2021-07-13 05:38:13

#	User	Length	Language	Date
1	Steinar Simonnes	417	Haskell	2024-01-30 15:52:54
2	Øyvind Almli	524	Haskell	2021-11-11 23:31:30
3	Sebastian Banert	574	Haskell	2024-06-16 13:59:29
4	Aurélien Pepin	630	Haskell	2019-11-20 11:18:30
5	Mason Barnhill	656	Haskell	2023-10-23 17:16:44
6	Jan Hrček	682	Haskell	2020-11-05 19:06:06
7	Caleb Surovik	922	Haskell	2021-07-02 20:48:49
8	Brent Yorgey	1064	Haskell	2019-11-15 19:15:34
9	Caden Haustein	1202	Haskell	2023-04-21 19:26:36
10	Johan Adamsson	1471	Haskell	2020-02-18 20:45:11

#	User	Length	Language	Date
1	hassoun karoum	864	Java	2020-02-10 20:26:43
2	Team E	875	Java	2019-11-09 18:22:05
3	Natalie Longtin	902	Java	2020-02-29 21:11:56
4	Doug Goodman	920	Java	2019-11-16 16:59:41
5	Evan Losier	926	Java	2019-11-21 03:32:04
6	Meghan Lin	934	Java	2020-02-29 22:54:29
7	Meghan Lin	963	Java	2021-03-05 20:53:46
8	Yoki	1016	Java	2023-02-22 00:00:57
9	Hidden user	1018	Java	2019-11-16 22:26:52
10	David Harmeyer	1018	Java	2019-12-01 18:58:56

#	User	Length	Language	Date
1	Peter Kedemo	911	JavaScript (Node.js)	2019-12-21 16:11:49
2	Chris Wong	1231	JavaScript (Node.js)	2021-02-16 23:05:56
3	John	1360	JavaScript (Node.js)	2021-04-08 11:30:46
4	Hidden user	1567	JavaScript (Node.js)	2024-09-13 20:44:10
5	Howard Tin Chi Chan	1616	JavaScript (Node.js)	2021-02-17 08:58:15
6	Logan Emmert	1803	JavaScript (Node.js)	2021-03-06 09:55:19
7	Andoko Chandra	2357	JavaScript (Node.js)	2020-10-08 22:43:24

#	User	Length	Language	Date
1	Jimmy Gustafsson	329	JavaScript (SpiderMonkey)	2024-06-17 21:39:21
2	Peter Menyes	584	JavaScript (SpiderMonkey)	2021-08-22 20:27:56
3	Bjørn Chr. Soltvedt	702	JavaScript (SpiderMonkey)	2019-11-17 11:16:11
4	Christian Pilegaard Cederquist	779	JavaScript (SpiderMonkey)	2023-01-15 14:02:22
5	Evan Magill	1031	JavaScript (SpiderMonkey)	2024-06-11 03:54:29

#	User	Length	Language	Date
1	Danny Robinson	171	Julia	2023-09-05 09:46:59
2	Timothy Gaede	1522	Julia	2024-03-26 03:27:45

#	User	Length	Language	Date
1	Chris Johnson	550	Kotlin	2025-01-29 22:52:31
2	Troy Warmboe	931	Kotlin	2020-02-09 00:18:55
3	Adam Rankin	931	Kotlin	2023-08-26 01:43:04
4	Hidden user	1022	Kotlin	2019-11-19 13:07:14
5	Caden G	1088	Kotlin	2019-11-18 17:09:03
6	Paul Kelley	1088	Kotlin	2019-11-18 17:16:22
7	Filip Belik	1088	Kotlin	2019-11-20 19:07:13
8	Einar Kjellback	1159	Kotlin	2019-11-28 15:12:16
9	Phường Lên	1322	Kotlin	2019-11-19 06:19:48
10	Marit van Dijk	1464	Kotlin	2021-09-17 14:36:10

#	User	Length	Language	Date
1	Matthew Lutze	1356	OCaml	2020-05-20 02:30:54

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1371	Pascal	2019-11-20 15:57:26

#	User	Length	Language	Date
1	Renate	668	PHP	2021-06-19 22:43:47
2	Connor Billings	1370	PHP	2020-01-03 05:10:41
3	Peter Kvick	1815	PHP	2020-01-23 01:59:42

#	User	Length	Language	Date
1	Hakan Kjellerstrand	265	Prolog	2023-03-04 21:11:05
2	Andriy Zyevakov	1168	Prolog	2024-08-07 17:45:51

#	User	Length	Language	Date
1	Justin Su	366	Python 2	2019-11-16 10:22:25
2	Eric Williamson	422	Python 2	2019-11-11 04:32:53
3	Thomas Feld	432	Python 2	2019-11-26 10:59:48
4	Jesper Öqvist	464	Python 2	2019-11-19 14:34:13
5	Andreas Björklund	568	Python 2	2021-03-25 18:16:57
6	Andrei Stoica	656	Python 2	2021-09-22 13:02:38
7	Yanmarshus Bachtiar	758	Python 2	2020-08-18 10:03:31
8	Mukerem Ali Nur	778	Python 2	2019-11-27 07:50:31
9	Johan Lyts	883	Python 2	2019-11-17 14:15:07
10	Hong An Tran	906	Python 2	2021-04-10 20:59:25

#	User	Length	Language	Date
1	Clement Oh	178	Python 3	2023-10-03 08:54:44
2	Troy Kidd	183	Python 3	2023-09-16 18:52:49
3	Hermann Ingi Hermannsson	187	Python 3	2024-01-17 16:51:15
4	Ahmed Chamseddine	192	Python 3	2024-07-13 20:14:02
5	Vilborg Erlendsdóttir	193	Python 3	2024-01-17 16:56:31
6	Hidden user	198	Python 3	2023-08-17 17:24:52
7	Hidden user	200	Python 3	2020-07-11 21:00:18
8	Charles Ancheta	213	Python 3	2023-04-09 19:14:47
9	Tai Tze Kin	223	Python 3	2024-05-02 21:24:45
10	Henrik Olsen Eide	232	Python 3	2023-09-20 23:45:44

#	User	Length	Language	Date
1	Thomas Feld	101	Ruby	2022-11-17 15:05:16
2	Hidden user	269	Ruby	2019-11-30 21:21:39
3	Miorel Palii	548	Ruby	2019-12-01 21:12:39
4	Macdara mac an tSionnaigh	1101	Ruby	2019-11-26 02:40:30

#	User	Length	Language	Date
1	Vincent Lagerros	691	Rust	2025-02-06 19:08:02
2	Pankajkumar Patro	740	Rust	2024-11-18 17:41:32
3	David Rasch	1094	Rust	2023-08-16 12:15:48
4	Kok Dith	1269	Rust	2021-08-14 17:35:07
5	Emil Skydsgaard	1288	Rust	2022-07-14 16:27:27
6	Bas Dirks	1397	Rust	2022-01-05 10:40:55
7	Ryan Mueller	1424	Rust	2023-12-04 14:58:53
8	Freek van Keulen	1436	Rust	2021-07-25 11:42:52
9	David Zacek	1454	Rust	2021-06-01 18:38:15
10	Alex G	1995	Rust	2020-02-14 22:53:28

Solution running time distribution