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

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Submissions	4902
Accepted submissions	2499
Submission ratio	50.98%
Authors	2322
Full solves [?]	2151
Full solve Ratio	92.64%

#	User	Runtime	Language	Date
1	Michael Palkovics	0.02 s	C#	2019-11-18 15:16:48
2	Muhammed Edip Okur	0.02 s	C#	2019-11-19 06:09:13
3	Johan Pettersson	0.02 s	C#	2019-11-19 15:39:00
4	Wendel Fabian Chinsamy	0.02 s	C#	2019-11-21 10:16:42
5	Rasmus Leyes	0.02 s	C#	2019-11-23 17:02:27
6	Thomas Norris	0.02 s	C#	2019-11-25 15:07:08
7	Sebastian Gielinger	0.02 s	C#	2019-11-27 09:56:03
8	Julian Brandt	0.02 s	C#	2019-11-28 19:56:17
9	Garway Mei	0.02 s	C#	2019-11-29 20:15:46
10	권의현	0.02 s	C#	2019-12-02 23:12:12

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Common Lisp	2020-01-19 03:12:41
2	David Cawthon	0.01 s	Common Lisp	2020-06-22 02:12:56

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

#	User	Runtime	Language	Date
1	Norbert Voelker	0.08 s	Go	2021-04-22 11:54:25
2	Resa Renaldy	0.08 s	Go	2021-07-13 03:38:13
3	Sergey Jakobsen	0.08 s	Go	2022-02-03 22:39:16

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

#	User	Runtime	Language	Date
1	Ragna María Sverrisdóttir	0.04 s	Java	2025-01-21 21:50:27
2	Jason Oliphant	0.05 s	Java	2024-04-12 02:03:28
3	Ku Brian	0.05 s	Java	2024-05-08 03:11:16
4	Lim Zhan Hong	0.06 s	Java	2020-05-22 03:37:02
5	Ryan Lee Ting Zhern	0.06 s	Java	2020-05-23 00:25:02
6	Hidden user	0.06 s	Java	2020-06-03 19:35:27
7	Theodoric Keith Lim	0.06 s	Java	2020-06-07 06:52:23
8	Jannik We	0.06 s	Java	2020-06-09 14:55:08
9	Igor Trúchlik	0.06 s	Java	2020-06-13 08:38:03
10	Samuel Klingström	0.06 s	Java	2020-06-17 18:12:17

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	JavaScript (Node.js)	2024-09-13 18:44:10
2	Peter Kedemo	0.41 s	JavaScript (Node.js)	2019-12-21 15:11:49
3	Chris Wong	0.42 s	JavaScript (Node.js)	2021-02-16 22:05:56
4	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-02-17 07:58:15
5	Logan Emmert	0.42 s	JavaScript (Node.js)	2021-03-06 08:55:19
6	John	0.42 s	JavaScript (Node.js)	2021-04-08 09:30:46
7	Andoko Chandra	0.43 s	JavaScript (Node.js)	2020-10-08 20:43:24

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-15 13:02:22
2	Evan Magill	0.02 s	JavaScript (SpiderMonkey)	2024-06-11 01:54:29
3	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-06-17 19:39:21
4	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2019-11-17 10:16:11
5	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-08-22 18:27:56

#	User	Runtime	Language	Date
1	Timothy Gaede	0.65 s	Julia	2024-03-26 02:27:45
2	Danny Robinson	0.91 s	Julia	2023-09-05 07:46:59

#	User	Runtime	Language	Date
1	Marit van Dijk	0.16 s	Kotlin	2021-09-17 12:36:10
2	Adam Rankin	0.17 s	Kotlin	2023-08-25 23:43:04
3	Caden G	0.18 s	Kotlin	2019-11-18 16:09:03
4	Paul Kelley	0.18 s	Kotlin	2019-11-18 16:16:22
5	Filip Belik	0.18 s	Kotlin	2019-11-20 18:07:13
6	Phường Lên	0.19 s	Kotlin	2019-11-19 05:19:48
7	Hidden user	0.20 s	Kotlin	2019-11-19 12:07:14
8	Einar Kjellback	0.20 s	Kotlin	2019-11-28 14:12:16
9	Troy Warmboe	0.23 s	Kotlin	2020-02-08 23:18:55
10	Chris Johnson	0.26 s	Kotlin	2025-01-29 21:52:31

#	User	Runtime	Language	Date
1	Matthew Lutze	0.00 s	OCaml	2020-05-20 00:30:54

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2019-11-20 14:57:26

#	User	Runtime	Language	Date
1	Connor Billings	0.01 s	PHP	2020-01-03 04:10:41
2	Peter Kvick	0.01 s	PHP	2020-01-23 00:59:42
3	Renate Fiala-Lundström	0.01 s	PHP	2021-06-19 20:43:47

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.02 s	Prolog	2024-08-07 15:45:51
2	Hakan Kjellerstrand	0.03 s	Prolog	2023-02-05 18:36:13

#	User	Runtime	Language	Date
1	Eric Williamson	0.03 s	Python 2	2019-11-11 03:32:53
2	Justin Su	0.03 s	Python 2	2019-11-16 09:22:25
3	Hugo Nissar	0.03 s	Python 2	2019-11-16 12:54:47
4	Ram Basnet	0.03 s	Python 2	2019-11-16 23:28:39
5	Johan Lyts	0.03 s	Python 2	2019-11-17 13:15:07
6	Kevin _	0.03 s	Python 2	2019-11-18 18:40:56
7	Jesper Öqvist	0.03 s	Python 2	2019-11-19 13:34:13
8	Thomas Feld	0.03 s	Python 2	2019-11-26 09:59:48
9	Sigurður Jens Albertsson	0.03 s	Python 2	2019-11-26 21:14:10
10	Mukerem Ali Nur	0.03 s	Python 2	2019-11-27 06:50:31

#	User	Runtime	Language	Date
1	Nick Breems	0.02 s	Python 3	2019-11-10 00:26:24
2	Godmar Back	0.02 s	Python 3	2019-11-10 14:49:12
3	April Chao	0.02 s	Python 3	2019-11-15 18:14:24
4	Sebastian Boldsen Jakobsen	0.02 s	Python 3	2019-11-15 19:30:43
5	William Lynch	0.02 s	Python 3	2019-11-15 19:33:57
6	Steffen Andrè Grønmo	0.02 s	Python 3	2019-11-15 20:07:09
7	Jacob Fahy	0.02 s	Python 3	2019-11-15 20:52:05
8	Bjørn Dons	0.02 s	Python 3	2019-11-15 20:54:40
9	Ron Sprenkels	0.02 s	Python 3	2019-11-15 22:19:08
10	Christofer Ohlsson	0.02 s	Python 3	2019-11-15 22:24:32

#	User	Runtime	Language	Date
1	Macdara mac an tSionnaigh	0.04 s	Ruby	2019-11-26 01:40:30
2	Hidden user	0.04 s	Ruby	2019-11-30 20:21:39
3	Miorel Palii	0.05 s	Ruby	2019-12-01 20:12:39
4	Thomas Feld	0.06 s	Ruby	2022-11-17 14:05:16

#	User	Length	Language	Date
1	Martin Blom	339	C	2024-01-06 23:32:58
2	Bergur Snorrason	660	C	2024-01-17 08:20:49
3	Ximun Castoreo	854	C	2020-02-13 15:27:35
4	PhilCampbell	873	C	2021-01-07 16:17:39
5	Hidden user	875	C	2019-12-04 12:14:00
6	Aileen Zhu	987	C	2020-02-23 16:52:37
7	Mirel Cosulschi	1053	C	2025-02-27 13:49:28
8	Joakim Skoog	1062	C	2019-12-11 18:40:19
9	Emil Wihlander	1064	C	2020-12-05 07:13:42
10	Sambit Palit	1095	C	2020-10-13 18:04:11

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

#	User	Length	Language	Date
1	Jaxon Ballentine	351	C++	2025-06-18 20:08:56
2	Tyler Fernando	352	C++	2022-11-21 09:55:02
3	妹様万歳	571	C++	2020-01-19 02:37:28
4	Alan Bright	580	C++	2024-11-18 13:35:34
5	1中二病怪胎	583	C++	2021-12-22 12:37:47
6	Ritul Kumar Singh	598	C++	2024-04-27 08:32:14
7	WU DI	604	C++	2022-12-07 13:30:09
8	Dmitry Lyubshin	604	C++	2023-03-20 05:13:36
9	justin LI	607	C++	2025-09-03 13:54:07
10	Evan Michael Bailey	621	C++	2024-02-23 15:57:42

#	User	Length	Language	Date
1	Hidden user	1175	Common Lisp	2020-01-19 03:12:41
2	David Cawthon	1477	Common Lisp	2020-06-22 02:12:56

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

#	User	Length	Language	Date
1	Sergey Jakobsen	870	Go	2022-02-03 22:41:33
2	Norbert Voelker	1411	Go	2021-04-22 11:58:25
3	Resa Renaldy	1462	Go	2021-07-13 03:38:13

#	User	Length	Language	Date
1	Steinar Simonnes	417	Haskell	2024-01-30 14:52:54
2	Øyvind Almli	524	Haskell	2021-11-11 22:31:30
3	Sebastian Banert	574	Haskell	2024-06-16 11:59:29
4	Aurélien Pepin	630	Haskell	2019-11-20 10:18:30
5	Mason Barnhill	656	Haskell	2023-10-23 15:16:44
6	Jan Hrček	682	Haskell	2020-11-05 18:06:06
7	Caleb Surovik	922	Haskell	2021-07-02 18:48:49
8	Brent Yorgey	1064	Haskell	2019-11-15 18:15:34
9	Caden Haustein	1202	Haskell	2023-04-21 17:26:36
10	Johan Adamsson	1471	Haskell	2020-02-18 19:45:11

#	User	Length	Language	Date
1	hassoun karoum	864	Java	2020-02-10 19:26:43
2	Team E	875	Java	2019-11-09 17:22:05
3	Natalie Longtin	902	Java	2020-02-29 20:11:56
4	Doug Goodman	920	Java	2019-11-16 15:59:41
5	Evan Losier	926	Java	2019-11-21 02:32:04
6	Meghan Lin	934	Java	2020-02-29 21:54:29
7	Meghan Lin	963	Java	2021-03-05 19:53:46
8	Yoki	1016	Java	2023-02-21 23:00:57
9	Hidden user	1018	Java	2019-11-16 21:26:52
10	David Harmeyer	1018	Java	2019-12-01 17:58:56

#	User	Length	Language	Date
1	Peter Kedemo	911	JavaScript (Node.js)	2019-12-21 15:11:49
2	Chris Wong	1231	JavaScript (Node.js)	2021-02-16 22:05:56
3	John	1360	JavaScript (Node.js)	2021-04-08 09:30:46
4	Hidden user	1567	JavaScript (Node.js)	2024-09-13 18:44:10
5	Howard Tin Chi Chan	1616	JavaScript (Node.js)	2021-02-17 07:58:15
6	Logan Emmert	1803	JavaScript (Node.js)	2021-03-06 08:55:19
7	Andoko Chandra	2357	JavaScript (Node.js)	2020-10-08 20:43:24

#	User	Length	Language	Date
1	Jimmy Gustafsson	329	JavaScript (SpiderMonkey)	2024-06-17 19:39:21
2	Peter Menyes	584	JavaScript (SpiderMonkey)	2021-08-22 18:27:56
3	Bjørn Chr. Soltvedt	702	JavaScript (SpiderMonkey)	2019-11-17 10:16:11
4	Christian Pilegaard Cederquist	779	JavaScript (SpiderMonkey)	2023-01-15 13:02:22
5	Evan Magill	1031	JavaScript (SpiderMonkey)	2024-06-11 01:54:29

#	User	Length	Language	Date
1	Danny Robinson	171	Julia	2023-09-05 07:46:59
2	Timothy Gaede	1522	Julia	2024-03-26 02:27:45

#	User	Length	Language	Date
1	Chris Johnson	550	Kotlin	2025-01-29 21:52:31
2	Troy Warmboe	931	Kotlin	2020-02-08 23:18:55
3	Adam Rankin	931	Kotlin	2023-08-25 23:43:04
4	Hidden user	1022	Kotlin	2019-11-19 12:07:14
5	Caden G	1088	Kotlin	2019-11-18 16:09:03
6	Paul Kelley	1088	Kotlin	2019-11-18 16:16:22
7	Filip Belik	1088	Kotlin	2019-11-20 18:07:13
8	Einar Kjellback	1159	Kotlin	2019-11-28 14:12:16
9	Phường Lên	1322	Kotlin	2019-11-19 05:19:48
10	Marit van Dijk	1464	Kotlin	2021-09-17 12:36:10

#	User	Length	Language	Date
1	Matthew Lutze	1356	OCaml	2020-05-20 00:30:54

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1371	Pascal	2019-11-20 14:57:26

#	User	Length	Language	Date
1	Renate Fiala-Lundström	668	PHP	2021-06-19 20:43:47
2	Connor Billings	1370	PHP	2020-01-03 04:10:41
3	Peter Kvick	1815	PHP	2020-01-23 00:59:42

#	User	Length	Language	Date
1	Hakan Kjellerstrand	265	Prolog	2023-03-04 20:11:05
2	Andriy Zyevakov	1168	Prolog	2024-08-07 15:45:51

#	User	Length	Language	Date
1	Justin Su	366	Python 2	2019-11-16 09:22:25
2	Eric Williamson	422	Python 2	2019-11-11 03:32:53
3	Thomas Feld	432	Python 2	2019-11-26 09:59:48
4	Jesper Öqvist	464	Python 2	2019-11-19 13:34:13
5	Andreas Björklund	568	Python 2	2021-03-25 17:16:57
6	Andrei Stoica	656	Python 2	2021-09-22 11:02:38
7	Yanmarshus Bachtiar	758	Python 2	2020-08-18 08:03:31
8	Mukerem Ali Nur	778	Python 2	2019-11-27 06:50:31
9	Johan Lyts	883	Python 2	2019-11-17 13:15:07
10	Hong An Tran	906	Python 2	2021-04-10 18:59:25

#	User	Length	Language	Date
1	Clement Oh	178	Python 3	2023-10-03 06:54:44
2	Troy Kidd	183	Python 3	2023-09-16 16:52:49
3	Hermann Ingi Hermannsson	187	Python 3	2024-01-17 15:51:15
4	Ahmed Chamseddine	192	Python 3	2024-07-13 18:14:02
5	Vilborg Erlendsdóttir	193	Python 3	2024-01-17 15:56:31
6	Hidden user	198	Python 3	2023-08-17 15:24:52
7	Hidden user	200	Python 3	2020-07-11 19:00:18
8	Charles Ancheta	213	Python 3	2023-04-09 17:14:47
9	Tai Tze Kin	223	Python 3	2024-05-02 19:24:45
10	Henrik Olsen Eide	232	Python 3	2023-09-20 21:45:44

#	User	Length	Language	Date
1	Thomas Feld	101	Ruby	2022-11-17 14:05:16
2	Hidden user	269	Ruby	2019-11-30 20:21:39
3	Miorel Palii	548	Ruby	2019-12-01 20:12:39
4	Macdara mac an tSionnaigh	1101	Ruby	2019-11-26 01:40:30

#	User	Length	Language	Date
1	Vincent Lagerros	691	Rust	2025-02-06 18:08:02
2	Pankajkumar Patro	740	Rust	2024-11-18 16:41:32
3	David Rasch	1094	Rust	2023-08-16 10:15:48
4	Kok Dith	1269	Rust	2021-08-14 15:35:07
5	Emil Skydsgaard	1288	Rust	2022-07-14 14:27:27
6	Bas Dirks	1397	Rust	2022-01-05 09:40:55
7	Ryan Mueller	1424	Rust	2023-12-04 13:58:53
8	Freek van Keulen	1436	Rust	2021-07-25 09:42:52
9	David Zacek	1454	Rust	2021-06-01 16:38:15
10	Alex G	1995	Rust	2020-02-14 21:53:28

Solution running time distribution