Problem A
Room Painting — Problem Statistics

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Submissions	13592
Accepted submissions	3751
Submission ratio	27.60%
Authors	3255
Full solves [?]	2721
Full solve Ratio	83.59%

#	User	Runtime	Language	Date
1	Arvid Jonasson	0.07 s	APL	2025-06-14 15:35:58

#	User	Runtime	Language	Date
1	Arvid Jonasson	0.01 s	C	2025-06-19 11:51:17
2	Shiyi Du	0.02 s	C	2018-10-13 11:34:50
3	Ivan Petrov	0.02 s	C	2020-01-09 09:23:50
4	Bergur Snorrason	0.02 s	C	2020-10-29 08:20:52
5	Daniel	0.02 s	C	2021-11-18 17:42:19
6	Sang Won	0.02 s	C	2023-08-11 17:38:48
7	Tom	0.02 s	C	2024-11-09 20:58:49
8	Mirel Cosulschi	0.02 s	C	2025-04-24 15:10:51
9	Sambit Palit	0.03 s	C	2020-12-06 20:42:18
10	Francisca Salinas Durbahn (Alumno)	0.03 s	C	2025-05-30 05:15:28

#	User	Runtime	Language	Date
1	traxex	0.07 s	C#	2024-04-30 12:24:06
2	Linda Hansson	0.09 s	C#	2015-10-13 15:11:26
3	Nathan Andrews	0.10 s	C#	2024-10-18 23:28:54
4	Shiyi Du	0.11 s	C#	2018-10-13 10:49:13
5	Jayant Notani	0.12 s	C#	2020-01-25 00:17:33
6	Hidden user	0.13 s	C#	2020-07-21 10:35:20
7	Wesley Matthews	0.13 s	C#	2020-11-23 21:06:15
8	Justin Kennedy	0.14 s	C#	2020-11-23 22:51:28
9	Dan Wolff	0.15 s	C#	2020-02-08 13:48:59
10	Dan Church	0.15 s	C#	2022-06-24 18:31:48

#	User	Runtime	Language	Date
1	Cian Ruane	0.01 s	C++	2017-08-29 14:26:16
2	Eoin Davey	0.01 s	C++	2017-08-29 15:59:45
3	Sergio Vieri	0.01 s	C++	2018-03-25 05:51:29
4	Hidden user	0.01 s	C++	2019-02-18 20:48:06
5	Auburn Ford	0.01 s	C++	2019-03-25 07:47:10
6	Scott MacIntosh	0.01 s	C++	2020-01-31 21:16:20
7	Agis Daniels	0.01 s	C++	2020-03-04 15:30:26
8	Hidden user	0.01 s	C++	2021-07-05 00:50:46
9	Geralt of Rivia	0.01 s	C++	2022-08-16 02:54:08
10	TCFSH69	0.01 s	C++	2024-02-06 05:50:11

#	User	Runtime	Language	Date
1	Hidden user	0.08 s	Common Lisp	2019-07-11 20:42:36

#	User	Runtime	Language	Date
1	Kasper Berthelsen	0.56 s	F#	2022-03-11 18:51:19

#	User	Runtime	Language	Date
1	Kiki Ibrahim	0.02 s	Go	2024-08-10 13:45:02
2	Dylan	0.07 s	Go	2025-09-16 23:55:55
3	Norbert Voelker	0.10 s	Go	2022-02-20 13:08:49
4	Iker Lissarrague	0.10 s	Go	2022-03-15 23:04:44

#	User	Runtime	Language	Date
1	BlackcapCoder	0.06 s	Haskell	2019-05-12 12:40:29
2	Steinar Simonnes	0.08 s	Haskell	2024-06-09 13:50:42
3	Dario Vidas	0.24 s	Haskell	2016-02-16 00:23:23
4	Brent Yorgey	0.26 s	Haskell	2018-08-30 04:26:45
5	Stian	0.40 s	Haskell	2020-01-29 15:33:10
6	Joshua Coward	0.45 s	Haskell	2022-02-07 00:31:13
7	Henrieta Micheľová	0.49 s	Haskell	2020-01-28 12:49:23
8	Mikail Khan	0.69 s	Haskell	2022-02-16 19:08:27
9	Blake Hyde	0.91 s	Haskell	2019-12-03 16:41:05

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.09 s	Java	2024-04-07 19:01:42
2	Bjørn Dons	0.10 s	Java	2018-11-10 20:44:07
3	Mehdi Maick	0.11 s	Java	2018-08-27 20:41:21
4	Dominic Danborn	0.11 s	Java	2022-02-12 17:52:55
5	Siddharth Adusumelli	0.11 s	Java	2022-10-05 20:50:43
6	Kol Greenbaum	0.11 s	Java	2023-02-03 01:37:25
7	Hidden user	0.11 s	Java	2023-10-08 13:50:08
8	Aditya Gupta	0.12 s	Java	2022-02-18 05:38:45
9	Asmus Tørsleff	0.12 s	Java	2022-03-11 17:17:42
10	Jimmy Dinh	0.12 s	Java	2023-02-01 16:30:45

#	User	Runtime	Language	Date
1	Nicklas Østerberg	0.55 s	JavaScript (Node.js)	2021-11-29 11:40:12
2	Stephanie Keck	0.61 s	JavaScript (Node.js)	2020-01-30 22:43:36
3	Max Zheng	0.64 s	JavaScript (Node.js)	2021-10-23 21:18:10

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.09 s	JavaScript (SpiderMonkey)	2023-05-30 21:48:46
2	Christopher Walther	0.11 s	JavaScript (SpiderMonkey)	2021-05-01 02:20:18
3	Peter Kedemo	0.23 s	JavaScript (SpiderMonkey)	2017-06-24 19:07:42
4	Bjørn Chr. Soltvedt	0.31 s	JavaScript (SpiderMonkey)	2018-12-17 23:04:16

#	User	Runtime	Language	Date
1	Noszály Csaba	0.50 s	Julia	2025-05-15 18:53:18
2	Timothy Gaede	0.60 s	Julia	2024-05-30 08:55:45

#	User	Runtime	Language	Date
1	Nico Metger	0.36 s	Kotlin	2021-11-17 22:54:50
2	Phường Lên	0.38 s	Kotlin	2020-06-22 11:48:54
3	Chris Johnson	0.47 s	Kotlin	2023-11-28 01:27:15
4	Ditlef Alexander Diseth	0.48 s	Kotlin	2020-01-28 13:26:16

#	User	Runtime	Language	Date
1	Christian B	0.13 s	Lua	2025-09-05 03:04:15
2	Caleb Austin	0.29 s	Lua	2024-10-18 23:09:49

#	User	Runtime	Language	Date
1	Christofer Ohlsson	0.06 s	Python 2	2015-05-26 13:33:12
2	Luca Della Vedova	0.06 s	Python 2	2016-02-15 22:28:48
3	Ciara Godwin	0.06 s	Python 2	2017-08-29 18:48:43
4	Justin Su	0.06 s	Python 2	2018-10-02 01:47:05
5	Hermon Mulat	0.06 s	Python 2	2018-11-15 17:51:45
6	Thomas Feld	0.07 s	Python 2	2020-06-29 15:43:22
7	Johan Lyts	0.07 s	Python 2	2022-12-28 21:38:00
8	Oskar Haarklou Veileborg	0.09 s	Python 2	2018-11-11 15:44:47
9	Lars Åström	0.09 s	Python 2	2019-05-15 23:47:27
10	Andreas Björklund	0.10 s	Python 2	2020-11-25 21:35:10

#	User	Runtime	Language	Date
1	Anvit Sinha	0.07 s	Python 3	2024-09-29 03:41:54
2	Muhammad Sohail	0.07 s	Python 3	2024-10-04 00:22:39
3	Josh Taylor	0.08 s	Python 3	2022-07-07 04:02:44
4	Camilo Perez Osorio (Alumno)	0.08 s	Python 3	2024-09-26 05:48:55
5	Simon Lavoie	0.08 s	Python 3	2024-10-04 00:37:46
6	Alan Hu	0.08 s	Python 3	2024-10-23 01:41:50
7	Petr	0.08 s	Python 3	2024-12-30 15:28:42
8	satikit tupbumrung	0.08 s	Python 3	2025-02-03 04:27:52
9	Nguyên Khôi Đỗ	0.08 s	Python 3	2025-02-09 04:18:24
10	Rebecca Jackson	0.08 s	Python 3	2025-02-11 00:48:37

#	User	Runtime	Language	Date
1	Thomas Feld	0.20 s	Ruby	2023-03-29 12:51:13

#	User	Runtime	Language	Date
1	Alice Ryhl	0.01 s	Rust	2022-03-11 16:19:41
2	Vincent Lagerros	0.01 s	Rust	2024-08-01 03:21:51
3	Egor Kulikov	0.01 s	Rust	2025-01-10 18:43:06
4	Bas Dirks	0.01 s	Rust	2025-02-02 10:39:18
5	Joe Blower	0.01 s	Rust	2025-08-28 17:52:19
6	David Rasch	0.02 s	Rust	2020-11-19 16:13:52
7	Pahlevi Fikri Auliya	0.02 s	Rust	2021-03-15 23:57:09
8	Polly Clémentine Nielsen Boutet-Livoff	0.02 s	Rust	2022-03-11 17:23:37
9	Akemi Izuko	0.02 s	Rust	2022-09-07 04:09:13
10	Hidden user	0.02 s	Rust	2024-12-26 07:47:05

#	User	Runtime	Language	Date
1	Danial Haseeb	0.08 s	Swift	2023-09-29 20:04:46

#	User	Length	Language	Date
1	Arvid Jonasson	93	APL	2025-06-19 02:08:04

#	User	Length	Language	Date
1	Efren Jewel Dela Cruz	645	C	2025-10-18 12:22:13
2	Mirel Cosulschi	690	C	2025-04-24 15:10:51
3	Ivan Petrov	796	C	2020-01-09 09:23:50
4	Francisca Salinas Durbahn (Alumno)	1000	C	2025-05-30 05:15:28
5	Daniel	1044	C	2021-11-18 17:42:19
6	Sang Won	1379	C	2023-08-11 17:38:48
7	Filiph Salomonsson	1381	C	2025-06-18 14:34:36
8	Martin Berglund	1480	C	2025-06-14 00:06:04
9	Tom	1594	C	2024-11-09 20:58:49
10	Bergur Snorrason	1802	C	2020-10-29 08:20:52

#	User	Length	Language	Date
1	traxex	578	C#	2024-04-30 12:24:06
2	Shiyi Du	818	C#	2018-10-13 05:12:43
3	Nathan Andrews	819	C#	2024-10-18 23:28:54
4	Dan Church	917	C#	2022-06-24 18:31:48
5	Rohan Johnson	1126	C#	2022-11-04 14:40:04
6	Hidden user	1189	C#	2020-07-21 10:35:20
7	Daniel Juhl	1226	C#	2022-03-11 19:25:26
8	Daley Keister	1257	C#	2020-11-23 17:13:17
9	Edvin Mako	1454	C#	2020-02-05 18:23:53
10	Jayant Notani	1675	C#	2020-01-25 00:17:33

#	User	Length	Language	Date
1	Angela Qian	178	C++	2025-02-13 01:16:45
2	Yu-Chen Chan	191	C++	2024-02-06 06:37:27
3	Mugeon Kim	277	C++	2024-04-08 03:31:23
4	Johan Wind	298	C++	2015-09-25 13:54:03
5	Herman Karlsson	301	C++	2016-01-02 00:53:38
6	Flor Elisa Chacón Ochoa	304	C++	2018-06-15 06:31:10
7	Alexander Skidanov	312	C++	2024-10-16 20:49:59
8	__	317	C++	2025-09-07 05:27:47
9	Ryan Chew	318	C++	2019-02-07 11:11:20
10	James Jaya	320	C++	2015-09-15 16:51:14

#	User	Length	Language	Date
1	Hidden user	772	Common Lisp	2019-07-11 20:25:08

#	User	Length	Language	Date
1	Kasper Berthelsen	2118	F#	2022-03-11 18:51:19

#	User	Length	Language	Date
1	Norbert Voelker	602	Go	2022-02-20 13:08:49
2	Iker Lissarrague	943	Go	2022-03-15 23:04:44
3	Dylan	1210	Go	2025-09-16 23:55:55
4	Kiki Ibrahim	1652	Go	2024-08-10 13:45:02

#	User	Length	Language	Date
1	BlackcapCoder	346	Haskell	2019-05-12 12:45:52
2	Mikail Khan	368	Haskell	2022-02-16 19:08:27
3	Stian	423	Haskell	2020-01-29 15:33:10
4	Henrieta Micheľová	516	Haskell	2020-01-28 12:49:23
5	Steinar Simonnes	604	Haskell	2024-06-09 13:50:42
6	Blake Hyde	628	Haskell	2019-12-03 13:51:03
7	Dario Vidas	673	Haskell	2016-02-15 21:56:07
8	Joshua Coward	737	Haskell	2022-02-07 00:31:13
9	Brent Yorgey	1464	Haskell	2018-08-30 04:26:45

#	User	Length	Language	Date
1	Hidden user	454	Java	2023-10-08 13:59:38
2	Sujay Vadlakonda	482	Java	2021-09-04 18:51:23
3	Nikoline Olander Rasmussen	555	Java	2022-03-11 17:10:34
4	Lim Zi Wei	585	Java	2019-10-14 03:22:44
5	Hoàng Minh	589	Java	2018-10-02 04:00:12
6	Zhou Long	596	Java	2022-07-27 21:32:24
7	Johnathan Rhyne	633	Java	2020-02-25 03:07:10
8	Adil Rasiyani	651	Java	2020-01-24 22:24:48
9	Hidden user	671	Java	2023-10-10 20:56:52
10	Olaoluwa Samuel Oke	671	Java	2025-05-14 20:08:02

#	User	Length	Language	Date
1	Max Zheng	840	JavaScript (Node.js)	2021-10-23 21:18:10
2	Nicklas Østerberg	896	JavaScript (Node.js)	2021-11-29 11:40:12
3	Stephanie Keck	8275	JavaScript (Node.js)	2020-01-30 22:43:36

#	User	Length	Language	Date
1	Peter Kedemo	494	JavaScript (SpiderMonkey)	2017-06-24 19:07:42
2	Bjørn Chr. Soltvedt	496	JavaScript (SpiderMonkey)	2018-12-17 23:04:16
3	Christian Pilegaard Cederquist	730	JavaScript (SpiderMonkey)	2023-05-30 21:48:46
4	Christopher Walther	1133	JavaScript (SpiderMonkey)	2021-05-01 02:20:18

#	User	Length	Language	Date
1	Noszály Csaba	380	Julia	2025-05-15 18:53:18
2	Timothy Gaede	2091	Julia	2024-05-30 08:55:45

#	User	Length	Language	Date
1	Nico Metger	1043	Kotlin	2021-11-17 22:54:50
2	Phường Lên	1223	Kotlin	2020-06-22 11:48:54
3	Chris Johnson	1580	Kotlin	2023-11-28 01:27:15
4	Ditlef Alexander Diseth	2986	Kotlin	2020-01-28 13:27:23

#	User	Length	Language	Date
1	Caleb Austin	1358	Lua	2024-10-18 23:09:49
2	Christian B	2877	Lua	2025-09-05 03:04:15

#	User	Length	Language	Date
1	Johan Lyts	232	Python 2	2022-12-27 15:15:01
2	Thomas Feld	240	Python 2	2020-06-29 15:43:22
3	Justin Su	256	Python 2	2018-10-02 01:47:05
4	Andreas Björklund	260	Python 2	2020-11-25 21:35:10
5	Lars Åström	271	Python 2	2019-05-15 23:47:27
6	Hermon Mulat	325	Python 2	2018-11-15 17:51:45
7	William Taylor-Melanson	327	Python 2	2020-01-31 21:14:23
8	Oskar Haarklou Veileborg	331	Python 2	2018-11-11 15:42:32
9	Christofer Ohlsson	352	Python 2	2015-05-26 13:33:12
10	Ciara Godwin	485	Python 2	2017-08-29 18:47:18

#	User	Length	Language	Date
1	Nguyên Khôi Đỗ	123	Python 3	2025-02-09 04:24:15
2	Michael Goldwasser	133	Python 3	2025-09-14 01:16:02
3	Benjamin Z White	142	Python 3	2023-04-12 18:26:38
4	Joey Pabalan	142	Python 3	2025-09-17 00:16:12
5	Peter Stauder	145	Python 3	2023-02-11 20:07:00
6	Tai Tze Kin	167	Python 3	2024-05-04 18:38:43
7	Jian Shi	176	Python 3	2022-10-29 05:24:03
8	Clement Oh	178	Python 3	2023-12-31 17:07:38
9	Shashank Bhatt	180	Python 3	2024-07-22 19:20:19
10	Ahmed Chamseddine	182	Python 3	2024-09-16 13:48:51

#	User	Length	Language	Date
1	Thomas Feld	72	Ruby	2023-03-29 12:51:13

#	User	Length	Language	Date
1	Bas Dirks	596	Rust	2025-02-02 10:39:18
2	Marcus Persson	898	Rust	2025-06-19 04:43:32
3	Eric Källman	908	Rust	2025-06-16 12:54:33
4	Hidden user	947	Rust	2024-12-26 07:47:05
5	David Rasch	1031	Rust	2020-11-19 16:13:52
6	Alice Ryhl	1044	Rust	2022-03-11 16:19:41
7	Polly Clémentine Nielsen Boutet-Livoff	1118	Rust	2022-03-11 17:23:37
8	Viktor Valastin	1332	Rust	2020-01-29 14:16:21
9	Akemi Izuko	1430	Rust	2022-09-07 04:28:53
10	Tuncay Alarcin	1554	Rust	2023-11-12 17:27:56

#	User	Length	Language	Date
1	Danial Haseeb	479	Swift	2023-09-29 20:08:09

Solution running time distribution