Problem A
Grid — Problem Statistics

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Submissions	13136
Accepted submissions	4869
Submission ratio	37.07%
Authors	3441
Full solves [?]	3015
Full solve Ratio	87.62%

#	User	Runtime	Language	Date
1	Jón Steinn Elíasson	0.01 s	C	2017-06-23 03:17:08
2	Sean Harding	0.01 s	C	2018-05-09 04:21:16
3	Bergur Snorrason	0.01 s	C	2019-06-22 19:32:52
4	Ioannis Br	0.01 s	C	2020-01-12 03:31:25
5	Anton Siderud	0.01 s	C	2020-01-13 17:08:38
6	Ng Wei Jie	0.01 s	C	2020-02-17 21:46:26
7	joe	0.01 s	C	2020-11-20 13:24:13
8	Arup Ratan Guha	0.01 s	C	2022-02-14 19:15:18
9	Komatsuna	0.01 s	C	2022-06-03 02:58:09
10	Johan Larsson	0.01 s	C	2022-08-22 21:03:06

#	User	Runtime	Language	Date
1	Matthew Hooper	0.05 s	C#	2021-03-15 23:57:14
2	Henrik Hallbert	0.06 s	C#	2019-10-24 13:11:50
3	Muzakhir Amanzholov	0.06 s	C#	2021-06-16 03:52:57
4	Jasmin Baniya	0.06 s	C#	2021-06-17 04:23:25
5	Andrei Cosovan	0.07 s	C#	2026-03-01 18:00:41
6	Emad aldeen Issawi	0.08 s	C#	2023-08-20 15:46:31
7	traxex	0.09 s	C#	2024-05-06 20:37:16
8	Pontus Lidholm	0.10 s	C#	2023-08-09 21:07:31
9	Hidden user	0.10 s	C#	2026-03-03 11:48:03
10	Olle Björk	0.11 s	C#	2025-02-15 14:59:44

#	User	Runtime	Language	Date
1	Lingsong Zeng	0.01 s	C++	2016-10-23 19:26:18
2	Tomás Cariño	0.01 s	C++	2016-10-23 19:27:23
3	Darshan Godhia	0.01 s	C++	2016-10-23 22:06:52
4	Nick Wu	0.01 s	C++	2016-10-24 01:51:09
5	Tomas Lagland	0.01 s	C++	2016-10-24 20:35:10
6	Howard Cheng	0.01 s	C++	2016-10-25 21:26:17
7	Hua Fan Cai	0.01 s	C++	2016-11-24 23:11:48
8	Li Da	0.01 s	C++	2016-11-29 15:16:12
9	Clarence Chew	0.01 s	C++	2016-12-07 06:49:53
10	Li Yue Chen	0.01 s	C++	2016-12-07 06:51:10

#	User	Runtime	Language	Date
1	Kevin Retzke	0.05 s	Common Lisp	2019-07-14 05:43:40
2	Hidden user	0.18 s	Common Lisp	2019-07-13 01:40:34

#	User	Runtime	Language	Date
1	Marcus Salzer	0.78 s	Dart	2024-09-18 19:01:40

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.18 s	F#	2023-02-18 17:53:12

#	User	Runtime	Language	Date
1	RAFAEL ESTANISLAU MORAIS DOS SANTOS	0.03 s	Go	2025-05-21 22:12:57
2	Jonas Mittnacht	0.12 s	Go	2024-02-11 17:21:57
3	Krzysztof Gibuła	0.27 s	Go	2021-05-24 23:54:21
4	Norbert Voelker	0.27 s	Go	2021-09-12 00:42:59

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.15 s	Haskell	2024-03-31 18:50:05
2	Joshua Coward	0.94 s	Haskell	2021-11-09 05:10:28

#	User	Runtime	Language	Date
1	Paul Boddington	0.09 s	Java	2017-01-04 06:56:08
2	Sven Rönnbäck	0.09 s	Java	2023-04-28 22:11:25
3	John Isak Fjellvang Villanger	0.10 s	Java	2018-10-25 23:10:04
4	James Black	0.11 s	Java	2017-11-11 03:39:08
5	JOKER	0.11 s	Java	2024-12-03 03:26:44
6	Joakim Sunde	0.12 s	Java	2018-10-25 03:58:38
7	Tristan Madden	0.14 s	Java	2018-04-20 22:49:45
8	William Fiset	0.15 s	Java	2016-10-27 17:48:29
9	Johan Holm Åström	0.15 s	Java	2018-11-15 19:37:56
10	Guangyi Zhou	0.15 s	Java	2025-03-15 04:37:35

#	User	Runtime	Language	Date
1	Thomas Wingsternes	0.37 s	JavaScript (Node.js)	2022-11-10 12:55:02

#	User	Runtime	Language	Date
1	Jimmy Gustafsson	0.06 s	JavaScript (SpiderMonkey)	2022-08-09 13:25:39
2	Håkan Lindahl	0.08 s	JavaScript (SpiderMonkey)	2022-08-21 20:01:28
3	Christian Pilegaard Cederquist	0.27 s	JavaScript (SpiderMonkey)	2023-05-25 12:38:58
4	Bjørn Chr. Soltvedt	0.86 s	JavaScript (SpiderMonkey)	2016-10-30 01:36:10

#	User	Runtime	Language	Date
1	Timothy Gaede	0.72 s	Julia	2025-10-31 05:56:01

#	User	Runtime	Language	Date
1	Sam Keyser	0.36 s	Kotlin	2023-04-19 17:20:59
2	Eric Sjöström	0.39 s	Kotlin	2023-08-15 18:27:51
3	Roy Liu	0.46 s	Kotlin	2023-08-14 20:28:53
4	Chelsea Hoernemann	0.61 s	Kotlin	2022-12-01 21:09:36
5	Hidden user	0.63 s	Kotlin	2019-11-21 15:40:12
6	Phường Lên	0.67 s	Kotlin	2019-11-19 06:05:40
7	poppyer	0.68 s	Kotlin	2022-08-08 01:43:22
8	Aksel Holbek Sørbye	0.80 s	Kotlin	2025-10-03 22:22:24
9	Emil Göransson	0.90 s	Kotlin	2023-08-15 16:40:06
10	Adam Rankin	0.97 s	Kotlin	2023-09-16 03:31:03

#	User	Runtime	Language	Date
1	Marcel Goh	0.03 s	OCaml	2019-11-24 23:41:05
2	Artemis Ngoh	0.24 s	OCaml	2024-04-14 14:17:08

#	User	Runtime	Language	Date
1	Alfredo Beaumont	0.06 s	Odin	2024-02-12 20:24:16

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.03 s	Pascal	2018-12-15 13:20:24

#	User	Runtime	Language	Date
1	Julius Thunström	0.08 s	Python 2	2020-05-30 02:03:54
2	Andreas Björklund	0.10 s	Python 2	2019-04-14 17:38:13
3	Yanmarshus Bachtiar	0.10 s	Python 2	2020-10-18 13:50:38
4	Robin Karlberg	0.16 s	Python 2	2019-02-03 12:23:14
5	Thomas Granbohm	0.16 s	Python 2	2019-02-03 12:23:34
6	Thomas Hayes	0.16 s	Python 2	2022-10-27 17:07:44
7	Sivasankaran D	0.16 s	Python 2	2025-08-25 15:36:42
8	Johan Lyts	0.17 s	Python 2	2019-12-13 14:55:31
9	Rickard Mårtensson	0.19 s	Python 2	2018-03-18 14:26:11
10	Oscar Persson	0.19 s	Python 2	2018-03-18 14:26:37

#	User	Runtime	Language	Date
1	John Djorup	0.09 s	Python 3	2025-05-13 14:58:51
2	Ryan Chattopadhyay	0.09 s	Python 3	2026-03-06 00:01:22
3	Julius Thunström	0.10 s	Python 3	2020-05-30 01:59:59
4	Gustav Nilsson Gisleskog	0.10 s	Python 3	2024-09-07 13:01:21
5	Lawry Sorenson	0.10 s	Python 3	2024-11-15 02:18:59
6	Michael Bratcher	0.10 s	Python 3	2024-12-08 21:59:39
7	Yash Jani	0.10 s	Python 3	2024-12-08 22:44:51
8	Wernher To	0.10 s	Python 3	2025-01-30 19:23:56
9	Julian Dalban	0.10 s	Python 3	2025-03-31 22:12:12
10	Jun Heo	0.10 s	Python 3	2025-04-05 06:53:12

#	User	Runtime	Language	Date
1	Morten Lohne	0.01 s	Rust	2018-11-04 17:27:09
2	Mathias Magnusson	0.01 s	Rust	2019-02-05 12:35:14
3	Isak Jägberg	0.01 s	Rust	2019-05-12 13:53:21
4	Melker Forsberg	0.01 s	Rust	2023-08-07 20:57:29
5	Hidden user	0.01 s	Rust	2023-08-09 14:58:05
6	Nicholas	0.01 s	Rust	2023-08-10 20:28:10
7	Vincent Lagerros	0.01 s	Rust	2024-08-14 21:00:05
8	Emrik Syrjänen	0.01 s	Rust	2025-02-13 15:56:13
9	David Nilsson	0.01 s	Rust	2025-02-13 20:02:21
10	Didzis Urtãns	0.01 s	Rust	2025-03-20 17:46:53

#	User	Runtime	Language	Date
1	Lucas Eduardo	0.04 s	Swift	2025-11-15 14:18:34

#	User	Runtime	Language	Date
1	Ștefan-Iulian Alecu	0.14 s	Visual Basic	2025-11-08 03:45:52

#	User	Length	Language	Date
1	hyunjoon kang	1364	C	2024-10-13 18:25:24
2	Mirel Cosulschi	1564	C	2022-12-04 21:32:38
3	Xiaochi Wang	1605	C	2022-07-17 10:40:46
4	CARLOS EDUARDO CHIARELLA BRAGA	1665	C	2025-05-21 21:34:43
5	Danial Motamedi Mehr	1704	C	2020-02-28 22:45:09
6	Komatsuna	1752	C	2022-06-03 02:58:09
7	Johan Larsson	1753	C	2022-08-22 21:03:06
8	Anton Siderud	2120	C	2020-01-13 17:08:38
9	Mikael Kökeritz	2135	C	2025-02-13 17:47:36
10	Dante Norling	2158	C	2025-02-08 20:57:54

#	User	Length	Language	Date
1	traxex	774	C#	2024-05-06 20:37:16
2	Andrei Cosovan	1111	C#	2026-03-01 18:00:41
3	Sven	1283	C#	2024-02-16 20:27:57
4	Lukas P.	1695	C#	2026-03-30 14:35:34
5	Hidden user	1714	C#	2026-03-03 11:48:03
6	Emad aldeen Issawi	2197	C#	2023-08-20 15:46:31
7	Ludwig Gehlsdorf	2203	C#	2020-08-30 18:32:37
8	Denis Traunter	2422	C#	2024-02-19 00:01:03
9	Matthew Hooper	2528	C#	2021-03-15 23:58:39
10	Muzakhir Amanzholov	2725	C#	2021-06-16 03:52:57

#	User	Length	Language	Date
1	Long Ji	604	C++	2025-10-09 14:02:58
2	Elias Lolck	649	C++	2022-04-08 17:14:48
3	Wen Li Looi	728	C++	2017-03-23 05:02:07
4	Emmanuel Anaya	742	C++	2020-11-04 17:35:37
5	Daniel Bogorad	749	C++	2026-03-10 02:49:49
6	Asbjørn Lind	754	C++	2024-12-25 02:52:01
7	Leonardo Blanger	758	C++	2021-01-02 02:05:56
8	Ernest Ng Zi Xuan	760	C++	2023-03-17 15:23:20
9	bekarhunmain	772	C++	2024-08-03 15:34:07
10	Sean Wei	790	C++	2020-04-24 12:56:05

#	User	Length	Language	Date
1	Kevin Retzke	1731	Common Lisp	2019-07-14 05:43:40
2	Hidden user	2859	Common Lisp	2019-07-13 01:29:33

#	User	Length	Language	Date
1	Marcus Salzer	1588	Dart	2024-09-18 19:01:40

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1500	F#	2023-02-18 17:53:12

#	User	Length	Language	Date
1	RAFAEL ESTANISLAU MORAIS DOS SANTOS	984	Go	2025-05-21 22:12:57
2	Jonas Mittnacht	1210	Go	2024-02-11 17:21:57
3	Krzysztof Gibuła	1560	Go	2021-05-24 23:54:21
4	Norbert Voelker	3701	Go	2021-09-12 00:42:59

#	User	Length	Language	Date
1	Joshua Coward	1251	Haskell	2021-11-09 05:10:28
2	Steinar Simonnes	1638	Haskell	2024-03-31 18:50:05

#	User	Length	Language	Date
1	Doug Goodman	1064	Java	2017-08-17 00:06:16
2	Russell Rivard	1078	Java	2022-03-22 19:22:16
3	Jiru Xu	1105	Java	2017-09-21 00:53:18
4	Azael Zamora	1122	Java	2020-03-05 23:40:12
5	Mitch Price	1138	Java	2016-11-13 05:10:34
6	Eric Williamson	1153	Java	2016-10-23 19:32:20
7	Ninghui Li	1204	Java	2019-09-22 18:01:28
8	Markus Bao	1238	Java	2024-01-05 04:28:59
9	Nathan Nguyen	1246	Java	2022-03-21 19:42:49
10	Nicholas Mugleston	1249	Java	2019-10-16 17:06:52

#	User	Length	Language	Date
1	Thomas Wingsternes	1562	JavaScript (Node.js)	2022-11-10 12:55:02

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	911	JavaScript (SpiderMonkey)	2023-05-25 12:38:58
2	Jimmy Gustafsson	1059	JavaScript (SpiderMonkey)	2022-08-09 13:25:39
3	Bjørn Chr. Soltvedt	1113	JavaScript (SpiderMonkey)	2016-10-30 01:36:10
4	Håkan Lindahl	1475	JavaScript (SpiderMonkey)	2022-08-21 13:14:23

#	User	Length	Language	Date
1	Timothy Gaede	961	Julia	2025-10-31 05:56:01

#	User	Length	Language	Date
1	poppyer	985	Kotlin	2022-08-08 01:43:22
2	Emil Göransson	1282	Kotlin	2023-08-15 16:38:21
3	Sam Keyser	1321	Kotlin	2023-04-19 17:20:59
4	Phường Lên	1587	Kotlin	2019-11-19 06:05:40
5	Adam Rankin	1667	Kotlin	2023-09-16 03:31:03
6	Eric Sjöström	1693	Kotlin	2023-08-15 18:27:51
7	Hidden user	1721	Kotlin	2019-11-21 15:40:12
8	Roy Liu	1813	Kotlin	2023-08-14 20:28:53
9	Chelsea Hoernemann	2479	Kotlin	2022-12-01 21:09:36
10	Aksel Holbek Sørbye	29867	Kotlin	2025-10-03 22:22:24

#	User	Length	Language	Date
1	Marcel Goh	1851	OCaml	2019-11-24 23:41:05
2	Artemis Ngoh	4073	OCaml	2024-04-14 14:17:08

#	User	Length	Language	Date
1	Alfredo Beaumont	864	Odin	2024-02-12 20:24:16

#	User	Length	Language	Date
1	Ingemar Ragnemalm	2565	Pascal	2018-12-15 13:20:24

#	User	Length	Language	Date
1	Thomas Feld	366	Python 2	2019-09-05 16:22:18
2	Ted Ying	438	Python 2	2017-10-15 19:36:12
3	Asger Hautop Drewsen	589	Python 2	2019-01-10 03:59:18
4	Hidden user	594	Python 2	2018-07-29 12:46:09
5	Andreas Björklund	603	Python 2	2019-04-14 17:38:13
6	David Hou	660	Python 2	2018-10-12 02:42:14
7	Jonatan Nilsson	673	Python 2	2018-03-26 18:20:57
8	Jacob Karlsson	675	Python 2	2018-04-04 14:40:51
9	Sivasankaran D	706	Python 2	2025-08-25 15:36:42
10	Oscar Persson	708	Python 2	2018-03-18 14:26:37

#	User	Length	Language	Date
1	Thomas Feld	225	Python 3	2023-08-28 15:27:24
2	Daniel Bogorad	225	Python 3	2026-03-11 17:30:14
3	Simon Hellsten	245	Python 3	2023-08-21 01:07:45
4	Mattéo Delabre	255	Python 3	2022-11-04 15:35:35
5	Blake Herrera	272	Python 3	2022-10-16 23:00:07
6	Josh Taylor	336	Python 3	2023-01-28 00:45:54
7	Jorge EstradaMartinez	346	Python 3	2025-04-17 20:33:39
8	Elliot Anderson	350	Python 3	2026-02-13 13:18:19
9	Andrew Tapia	425	Python 3	2024-10-10 01:38:56
10	Yong Mao	437	Python 3	2023-07-27 13:35:21

#	User	Length	Language	Date
1	Adam Gausmann	1437	Rust	2019-09-28 01:52:32
2	Mathias Magnusson	1500	Rust	2019-02-05 12:35:14
3	Morten Lohne	1661	Rust	2018-11-04 17:23:33
4	Oskar Lindén	1671	Rust	2022-08-09 12:56:38
5	Nicholas	1717	Rust	2023-08-10 20:28:10
6	Joel Simonsson	1878	Rust	2025-02-14 00:01:27
7	Gustav Häggström	1965	Rust	2025-02-12 23:02:05
8	Mckinley Xie	1988	Rust	2025-04-29 23:03:53
9	Didzis Urtãns	1998	Rust	2025-03-20 17:46:53
10	Philip Hedberg	2110	Rust	2026-03-17 16:44:15

#	User	Length	Language	Date
1	Lucas Eduardo	1104	Swift	2025-11-15 14:18:34

#	User	Length	Language	Date
1	Ștefan-Iulian Alecu	1278	Visual Basic	2025-11-08 03:45:52

Solution running time distribution