Problem A
Dominoes 2 — Problem Statistics

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Submissions	7709
Accepted submissions	2523
Submission ratio	32.73%
Authors	2194
Accepted authors	1905
Author ratio	86.83%

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	C	2017-05-27 17:28:47
2	Gia Bao Ho	0.01 s	C	2016-04-13 20:46:05
3	Nguyễn Hoàng	0.01 s	C	2016-05-06 12:18:16
4	Bernd Schmidt	0.01 s	C	2017-05-13 00:52:22
5	pengin	0.01 s	C	2021-08-17 12:59:22
6	Will Killian	0.01 s	C	2022-09-27 22:35:14
7	Hidden user	0.01 s	C	2024-12-15 12:06:25
8	Mehdi Maick	0.02 s	C	2016-08-03 23:52:32
9	Qi Chen	0.02 s	C	2016-10-11 06:28:43
10	Ayoub Chegraoui	0.02 s	C	2017-09-24 23:15:06

#	User	Runtime	Language	Date
1	masosz	0.06 s	C#	2015-02-10 21:12:27
2	Peti29	0.06 s	C#	2017-05-12 23:22:17
3	traxex	0.06 s	C#	2024-05-08 16:21:35
4	Luis fernando Mercado rodrigues	0.06 s	C#	2024-08-29 17:30:23
5	Carlos Palacios	0.06 s	C#	2025-05-09 03:46:04
6	Андрей Титов	0.07 s	C#	2016-02-19 08:09:11
7	Andriy Zyevakov	0.08 s	C#	2015-10-05 22:56:32
8	Jonathan Ibrahim	0.09 s	C#	2020-12-14 07:09:14
9	Nathan Andrews	0.12 s	C#	2024-11-15 22:44:43

#	User	Runtime	Language	Date
1	Sergio Vieri	0.00 s	C++	2018-02-18 05:38:47
2	Alexander Kravberg	0.00 s	C++	2022-10-24 12:48:59
3	Eyleifur Bjarkason	0.00 s	C++	2023-02-19 17:40:51
4	Mårten Wiman	0.01 s	C++	2014-03-06 17:34:21
5	Hidden user	0.01 s	C++	2014-03-06 17:45:13
6	Bjarki Ágúst Guðmundsson	0.01 s	C++	2014-05-28 20:21:20
7	Ingibergur Sindri Stefnisson	0.01 s	C++	2014-12-10 10:57:09
8	Darri Steinn Konráðsson	0.01 s	C++	2014-12-10 13:18:23
9	Davíð Guðni Halldórsson	0.01 s	C++	2014-12-10 13:35:06
10	Hidden user	0.01 s	C++	2014-12-10 14:43:38

#	User	Runtime	Language	Date
1	Maksar Shipkhineev	0.03 s	Go	2025-06-06 10:46:10
2	Norbert Voelker	0.10 s	Go	2021-09-28 18:52:48
3	Việt Hà Nguyễn	0.21 s	Go	2016-08-06 20:11:51
4	Iker Lissarrague	0.24 s	Go	2022-04-20 06:50:40
5	Kristoffer Åhgren	0.74 s	Go	2017-08-03 23:09:21

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.03 s	Haskell	2025-06-02 14:18:48
2	Hidden user	0.04 s	Haskell	2022-09-05 22:59:08
3	Markus Läll	0.21 s	Haskell	2015-02-25 10:46:43
4	Mason Barnhill	0.22 s	Haskell	2023-08-10 04:40:45
5	Matthew Craven	0.28 s	Haskell	2020-04-06 01:54:42

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.06 s	Java	2024-09-21 13:38:41
2	Asmus Tørsleff	0.08 s	Java	2022-03-16 10:50:17
3	Guangyi Zhou	0.08 s	Java	2024-12-02 09:50:46
4	Khánh Nguyễn Tiến	0.09 s	Java	2018-10-05 07:00:54
5	Nguyễn Hùng Cường	0.09 s	Java	2018-10-05 07:09:54
6	Đức Phạm Hoài	0.09 s	Java	2018-10-05 14:23:35
7	Faye Mohamed	0.10 s	Java	2018-02-06 01:19:14
8	Hidden user	0.10 s	Java	2018-02-07 00:02:17
9	Mehdi Maick	0.10 s	Java	2018-12-12 19:33:07
10	Nicholas Russell Saerang	0.10 s	Java	2023-09-30 02:09:29

#	User	Runtime	Language	Date
1	Stephanie Keck	0.66 s	JavaScript (Node.js)	2020-03-20 01:31:51

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.09 s	JavaScript (SpiderMonkey)	2018-07-10 18:07:36
2	Hà Minh Ngọc	0.10 s	JavaScript (SpiderMonkey)	2016-07-29 05:52:28
3	Christian Cederquist	0.12 s	JavaScript (SpiderMonkey)	2023-06-27 16:32:59

#	User	Runtime	Language	Date
1	Timothy Gaede	0.73 s	Julia	2024-06-19 07:01:59

#	User	Runtime	Language	Date
1	Chelsea Hoernemann	0.29 s	Kotlin	2022-11-29 23:22:04
2	Jesper Bech Christensen	0.41 s	Kotlin	2023-09-26 17:59:19
3	Adam Rankin	0.43 s	Kotlin	2023-09-20 05:52:19
4	Hidden user	0.48 s	Kotlin	2019-11-23 05:20:03
5	Jake Bounds	0.52 s	Kotlin	2024-10-11 20:49:20
6	Phường Lên	0.59 s	Kotlin	2019-11-21 06:49:15
7	Luca Mueller	0.59 s	Kotlin	2024-11-02 22:32:10

#	User	Runtime	Language	Date
1	Etienne Guillot-Marquet	0.08 s	Python 2	2017-11-26 04:49:02
2	Ciara Godwin	0.09 s	Python 2	2017-10-01 22:49:12
3	Thomas Feld	0.10 s	Python 2	2020-05-13 08:21:50
4	Hermon Mulat	0.11 s	Python 2	2018-01-06 04:27:20
5	css waw	0.11 s	Python 2	2021-03-26 20:24:14
6	Yanmarshus Bachtiar	0.11 s	Python 2	2021-06-03 02:58:27
7	Nick Wu	0.12 s	Python 2	2015-10-05 10:40:36
8	Josenildo Silva	0.12 s	Python 2	2017-05-06 20:57:44
9	Juliang Li	0.13 s	Python 2	2018-03-23 22:10:41
10	Kayla Branson	0.14 s	Python 2	2017-11-25 00:40:16

#	User	Runtime	Language	Date
1	Ram Basnet	0.07 s	Python 3	2018-12-05 16:05:55
2	Leon Tham	0.07 s	Python 3	2019-12-05 03:32:24
3	Gabriel Caballero	0.07 s	Python 3	2024-10-31 21:48:54
4	Dominic Berzin Chua Way Gin	0.07 s	Python 3	2025-04-18 07:26:30
5	Hyaline Seiche	0.08 s	Python 3	2017-05-12 22:58:07
6	Markus	0.08 s	Python 3	2019-07-10 15:57:15
7	Petr	0.08 s	Python 3	2025-06-29 13:55:04
8	Vishal Mohanty	0.09 s	Python 3	2018-04-09 17:39:45
9	Vincent Tandya	0.09 s	Python 3	2019-01-20 17:33:06
10	Anvit Sinha	0.09 s	Python 3	2024-10-14 04:24:19

#	User	Runtime	Language	Date
1	Joshua Coward	0.13 s	Ruby	2020-08-21 09:36:26

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2024-09-17 17:10:20
2	Hidden user	0.01 s	Rust	2019-04-26 07:25:08
3	Robin Björklin	0.01 s	Rust	2019-04-26 10:13:11
4	Klas af Geijerstam	0.01 s	Rust	2020-11-18 16:38:30
5	Alice Ryhl	0.01 s	Rust	2022-03-11 16:34:48
6	Artur Khuziakhmetov	0.01 s	Rust	2022-07-14 09:16:34
7	Niklas Sandén	0.01 s	Rust	2023-02-21 15:37:36
8	Miguel Roldán Muñoz	0.01 s	Rust	2023-08-07 18:00:28
9	Jeff Zhang	0.01 s	Rust	2024-12-07 23:55:39
10	Egor Kulikov	0.01 s	Rust	2025-01-25 17:37:46

#	User	Length	Language	Date
1	Will Killian	413	C	2022-09-27 22:35:14
2	Gia Bao Ho	620	C	2016-04-16 13:49:38
3	Nguyễn Hoàng	667	C	2016-04-11 14:36:16
4	Nguyen Thanh Chinh	667	C	2016-04-21 22:54:15
5	Hidden user	1011	C	2024-12-15 12:06:25
6	Charlie Bouthoorn	1077	C	2019-05-10 16:04:34
7	Mohamed Lamnaouar	1165	C	2018-02-08 01:38:12
8	Qi Chen	1693	C	2016-10-11 06:28:43
9	Ayoub Chegraoui	1696	C	2017-09-24 23:15:06
10	Mehdi Maick	1769	C	2016-08-03 23:52:32

#	User	Length	Language	Date
1	traxex	951	C#	2024-05-08 16:21:35
2	Carlos Palacios	1659	C#	2025-05-09 03:46:04
3	Peti29	1695	C#	2017-05-12 23:22:17
4	Andriy Zyevakov	2220	C#	2015-10-05 22:56:32
5	Luis fernando Mercado rodrigues	2397	C#	2024-08-29 17:30:23
6	Nathan Andrews	2512	C#	2024-11-15 22:44:43
7	masosz	2571	C#	2015-02-10 21:12:27
8	Андрей Титов	3481	C#	2016-02-19 08:09:11
9	Jonathan Ibrahim	4639	C#	2020-12-14 07:09:14

#	User	Length	Language	Date
1	Nghi Gia	517	C++	2024-04-12 09:57:30
2	William Gan	563	C++	2017-11-29 15:19:26
3	Elias Lolck	563	C++	2022-03-11 16:45:22
4	Yeung Man Tsung	563	C++	2022-11-25 08:29:54
5	Quanmeng Wang	569	C++	2015-10-16 15:40:21
6	Modan Han	573	C++	2017-07-29 22:19:15
7	Matteo Zappia	578	C++	2021-11-30 12:39:59
8	Hidden user	584	C++	2024-12-28 19:46:33
9	Max NC	594	C++	2024-09-26 16:34:30
10	Filippo Xausa	598	C++	2023-01-27 09:23:19

#	User	Length	Language	Date
1	Kristoffer Åhgren	1115	Go	2017-08-03 23:09:21
2	Việt Hà Nguyễn	1378	Go	2016-08-06 20:11:51
3	Iker Lissarrague	1380	Go	2022-04-20 06:50:40
4	Norbert Voelker	1427	Go	2021-09-28 18:52:48
5	Maksar Shipkhineev	2246	Go	2025-06-06 10:46:10

#	User	Length	Language	Date
1	Mason Barnhill	869	Haskell	2023-08-10 04:40:45
2	Matthew Craven	1540	Haskell	2020-04-06 01:54:42
3	Steinar Simonnes	1608	Haskell	2025-06-02 14:21:21
4	Hidden user	1740	Haskell	2022-09-05 22:59:08
5	Markus Läll	1801	Haskell	2015-02-25 10:46:43

#	User	Length	Language	Date
1	Natalie Longtin	757	Java	2019-01-17 21:39:06
2	Daniel West	808	Java	2019-01-17 21:46:03
3	Duncan Page	857	Java	2018-03-26 23:55:15
4	Hidden user	881	Java	2016-10-07 20:59:45
5	Stephen Royal	903	Java	2015-08-28 18:41:02
6	Gabriela Llave	1004	Java	2015-08-31 02:17:39
7	Younes Jarmouni	1029	Java	2018-07-05 14:42:32
8	Viet Dang	1040	Java	2018-03-18 03:04:17
9	Doug Goodman	1046	Java	2017-03-24 16:16:47
10	Jesse Ventura	1049	Java	2018-07-10 23:10:47

#	User	Length	Language	Date
1	Stephanie Keck	6650	JavaScript (Node.js)	2020-03-20 01:31:51

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	661	JavaScript (SpiderMonkey)	2018-07-10 18:07:36
2	Christian Cederquist	874	JavaScript (SpiderMonkey)	2023-06-27 16:32:59
3	Hà Minh Ngọc	1492	JavaScript (SpiderMonkey)	2016-07-29 05:52:28

#	User	Length	Language	Date
1	Timothy Gaede	1649	Julia	2024-06-19 07:01:59

#	User	Length	Language	Date
1	Jesper Bech Christensen	643	Kotlin	2023-09-26 17:59:19
2	Phường Lên	748	Kotlin	2019-11-21 06:49:15
3	Hidden user	983	Kotlin	2019-11-23 05:20:03
4	Jake Bounds	989	Kotlin	2024-10-11 20:49:20
5	Adam Rankin	1496	Kotlin	2023-09-20 05:52:19
6	Luca Mueller	1712	Kotlin	2024-11-02 22:32:10
7	Chelsea Hoernemann	1937	Kotlin	2022-11-29 23:22:04

#	User	Length	Language	Date
1	Thomas Feld	410	Python 2	2020-05-13 08:21:50
2	Oskar Haarklou Veileborg	464	Python 2	2019-04-24 14:14:56
3	Lars Åström	485	Python 2	2018-10-23 15:09:51
4	Yupeng Gu	496	Python 2	2018-06-27 05:43:41
5	Andreas Björklund	555	Python 2	2020-10-22 21:45:45
6	Brandon Sovran	585	Python 2	2022-02-10 01:38:41
7	css waw	624	Python 2	2021-03-26 20:24:14
8	Yanmarshus Bachtiar	654	Python 2	2021-06-03 02:58:27
9	Kayla Branson	675	Python 2	2017-11-25 00:40:16
10	Ciara Godwin	681	Python 2	2017-10-01 22:49:12

#	User	Length	Language	Date
1	Michael Goldwasser	279	Python 3	2024-10-10 06:57:30
2	Lukas Kerren	324	Python 3	2024-02-09 21:25:09
3	Will Killian	328	Python 3	2022-09-27 21:00:28
4	Ahmed Chamseddine	343	Python 3	2024-10-06 18:38:05
5	Ng Hua Yu	401	Python 3	2024-05-04 17:13:45
6	Thibault Raffaillac	402	Python 3	2021-02-14 12:44:24
7	Peter Stauder	403	Python 3	2024-06-05 15:58:15
8	Oskar Haarklou Veileborg	417	Python 3	2023-09-12 16:31:37
9	Elias Amha	429	Python 3	2019-10-11 08:26:35
10	Hidden user	429	Python 3	2020-11-16 13:48:17

#	User	Length	Language	Date
1	Joshua Coward	532	Ruby	2020-08-21 09:36:26

#	User	Length	Language	Date
1	Bas Dirks	1301	Rust	2022-06-14 14:43:14
2	Artur Khuziakhmetov	1345	Rust	2022-07-14 09:16:34
3	Alice Ryhl	1423	Rust	2022-03-11 16:34:48
4	Miguel Roldán Muñoz	1799	Rust	2023-08-07 18:00:28
5	Jeff Zhang	1862	Rust	2024-12-07 23:55:39
6	Hidden user	1920	Rust	2019-04-23 06:43:18
7	Polly Clémentine Nielsen Boutet-Livoff	1950	Rust	2022-03-12 14:40:46
8	Mikkel	2244	Rust	2023-09-19 16:56:29
9	carlo	2994	Rust	2022-11-06 15:29:07
10	Robin Björklin	3474	Rust	2019-04-25 03:36:31

Solution running time distribution