Problem A
Red Rover — Problem Statistics

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Submissions	1769
Accepted submissions	986
Submission ratio	55.74%
Authors	902
Full solves [?]	824
Full solve Ratio	91.35%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.09 s	Bash	2024-04-17 18:59:48

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.00 s	C	2019-07-11 22:43:52
2	Sambit Palit	0.00 s	C	2020-11-07 02:17:29
3	PhilCampbell	0.00 s	C	2021-01-28 17:20:57
4	Mirel Cosulschi	0.00 s	C	2024-12-22 13:40:32
5	Naveen Kumar S	0.00 s	C	2025-04-17 15:32:41

#	User	Runtime	Language	Date
1	Kunwei Zhang	0.02 s	C#	2018-06-15 15:21:41
2	Thomas Norris	0.03 s	C#	2019-10-10 22:37:27
3	Joshua Jacoby	0.03 s	C#	2020-06-07 20:47:03
4	Johan Litsfeldt	0.03 s	C#	2021-03-29 12:34:54
5	Göran Andersson	0.03 s	C#	2022-05-14 22:44:46
6	traxex	0.04 s	C#	2024-05-27 09:15:14
7	Johan Pettersson	0.08 s	C#	2018-04-23 14:41:18
8	Krzysztof Magda	0.08 s	C#	2023-07-28 19:45:00
9	Mikael Fiala-Lundström	0.11 s	C#	2021-04-22 21:27:49
10	Alex Van Keulen	0.12 s	C#	2019-09-06 20:31:33

#	User	Runtime	Language	Date
1	Hidden user	0.03 s	Common Lisp	2019-07-18 04:46:37

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.03 s	F#	2022-10-10 19:42:57

#	User	Runtime	Language	Date
1	Norbert Voelker	0.08 s	Go	2021-05-03 18:52:05
2	Resa Renaldy	0.08 s	Go	2021-07-21 07:26:44

#	User	Runtime	Language	Date
1	Matthew Johnson	0.01 s	Haskell	2018-02-17 04:36:07
2	Steinar Simonnes	0.01 s	Haskell	2024-02-19 09:23:39
3	Brent Yorgey	0.02 s	Haskell	2017-11-04 05:35:43
4	Lim Ming Yean	0.02 s	Haskell	2019-03-08 15:15:14
5	Intrets	0.02 s	Haskell	2019-08-21 19:20:39
6	Hidden user	0.02 s	Haskell	2019-08-23 15:52:15
7	Jan Hrček	0.03 s	Haskell	2021-03-26 06:58:43
8	Hidden user	0.04 s	Haskell	2023-01-18 12:34:11
9	Stefan Kennedy	0.06 s	Haskell	2018-09-02 15:01:54
10	Hannah Dougherty	0.06 s	Haskell	2019-05-10 01:55:47

#	User	Runtime	Language	Date
1	James Black	0.06 s	Java	2018-03-09 00:56:21
2	Morgan K Bender	0.06 s	Java	2018-03-09 01:33:17
3	José Vander Meulen	0.06 s	Java	2018-10-25 23:09:07
4	Jacob Merizian	0.07 s	Java	2017-11-04 19:31:59
5	Liam Keliher	0.07 s	Java	2018-06-21 02:12:20
6	Ahmad Barhamje	0.07 s	Java	2018-08-15 04:39:42
7	Castel Christopher	0.07 s	Java	2018-11-07 09:52:23
8	Emanuel Peroni	0.07 s	Java	2018-11-07 20:17:41
9	Sven Rönnbäck	0.07 s	Java	2022-01-22 16:07:35
10	John Roush	0.08 s	Java	2016-10-29 18:16:04

#	User	Runtime	Language	Date
1	Antonia Sisneros	0.09 s	JavaScript (Node.js)	2022-12-09 00:37:14
2	Peter Kedemo	0.41 s	JavaScript (Node.js)	2019-12-27 20:53:13
3	Andoko Chandra	0.53 s	JavaScript (Node.js)	2020-10-18 09:06:48
4	Chris Wong	0.53 s	JavaScript (Node.js)	2021-03-16 22:05:48

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2017-11-19 23:49:25
2	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-09-09 16:50:35
3	Christian Pilegaard Cederquist	0.03 s	JavaScript (SpiderMonkey)	2023-01-18 13:40:03
4	Zach Tschetter	0.09 s	JavaScript (SpiderMonkey)	2025-02-02 02:58:36

#	User	Runtime	Language	Date
1	Timothy Gaede	0.57 s	Julia	2024-06-15 05:07:06

#	User	Runtime	Language	Date
1	Nicholas Johnson	0.16 s	Kotlin	2021-03-30 06:00:53
2	Hidden user	0.18 s	Kotlin	2017-11-25 06:35:43
3	Ellis Tsung	0.20 s	Kotlin	2018-10-25 03:25:51
4	Jacob Huebner	0.21 s	Kotlin	2020-04-19 08:18:41
5	Adam Rankin	0.21 s	Kotlin	2023-05-10 22:47:22
6	Kiel Dowdle	0.23 s	Kotlin	2021-03-22 06:38:59
7	Слава Гуляев	0.26 s	Kotlin	2017-11-06 01:29:51
8	Gaurav Tyagi	0.28 s	Kotlin	2018-11-22 21:32:28
9	David McKenzie	0.31 s	Kotlin	2021-09-15 16:52:40
10	Neil Harmon	0.33 s	Kotlin	2019-04-26 10:37:15

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.02 s	Lua	2023-11-29 21:02:15

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.01 s	Pascal	2019-10-23 18:57:23

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.18 s	Prolog	2023-02-15 19:59:04

#	User	Runtime	Language	Date
1	Niklas Baumstark	0.03 s	Python 2	2016-11-09 21:11:18
2	Wei Peng	0.03 s	Python 2	2016-12-12 20:47:50
3	Maksym Bendeberia	0.03 s	Python 2	2018-02-24 18:03:40
4	Johan Wind	0.03 s	Python 2	2018-03-20 17:44:26
5	Johann Ly	0.03 s	Python 2	2018-04-09 08:34:56
6	Måns Magnusson	0.03 s	Python 2	2018-10-26 10:15:04
7	Jason Pham	0.03 s	Python 2	2018-11-04 19:26:46
8	Catalin Popa	0.03 s	Python 2	2019-01-07 18:20:29
9	Wang Zhi Jian	0.03 s	Python 2	2019-05-07 14:28:12
10	Thomas Feld	0.03 s	Python 2	2019-09-02 11:10:58

#	User	Runtime	Language	Date
1	James Hamm	0.02 s	Python 3	2017-11-06 16:05:40
2	Michael Pfeifer	0.02 s	Python 3	2017-11-06 20:06:02
3	Alexei Fedotov	0.02 s	Python 3	2017-11-07 16:04:49
4	Nathan Collins	0.02 s	Python 3	2017-11-10 14:32:52
5	Manu Lam	0.02 s	Python 3	2017-11-21 18:08:11
6	Peter Beattie	0.02 s	Python 3	2017-11-22 16:49:38
7	Ciara Godwin	0.02 s	Python 3	2017-11-23 18:47:29
8	Jón Steinn Elíasson	0.02 s	Python 3	2017-12-16 16:10:13
9	Jesse Ashmore	0.02 s	Python 3	2017-12-17 20:32:04
10	Денис Соболев	0.02 s	Python 3	2017-12-18 13:43:06

#	User	Runtime	Language	Date
1	Thomas Feld	0.07 s	Ruby	2023-02-28 11:14:23

#	User	Runtime	Language	Date
1	Magix	0.00 s	Rust	2021-12-28 18:11:24
2	Bas Dirks	0.00 s	Rust	2022-01-04 11:36:01
3	Akemi Izuko	0.00 s	Rust	2023-09-06 23:14:22
4	Vincent Lagerros	0.00 s	Rust	2025-06-17 18:22:46
5	Freek van Keulen	0.01 s	Rust	2021-07-28 20:34:56
6	Eric Pinter	0.01 s	Rust	2021-11-27 01:45:06

#	User	Length	Language	Date
1	Chenzhang Hu	1542	Bash	2024-04-17 18:59:48

#	User	Length	Language	Date
1	Bergur Snorrason	811	C	2019-07-11 22:43:52
2	Mirel Cosulschi	880	C	2024-12-22 13:40:32
3	Naveen Kumar S	920	C	2025-04-17 15:32:41
4	Sambit Palit	1005	C	2020-11-07 02:17:29
5	PhilCampbell	1321	C	2021-01-28 17:20:57

#	User	Length	Language	Date
1	Thomas Norris	441	C#	2019-10-10 22:37:27
2	traxex	502	C#	2024-05-27 09:15:14
3	Kunwei Zhang	528	C#	2018-06-15 15:21:41
4	Göran Andersson	871	C#	2022-05-14 22:44:46
5	Joshua Jacoby	897	C#	2020-06-07 20:47:03
6	Alex Van Keulen	902	C#	2019-09-06 20:31:33
7	Liam Percy	1096	C#	2018-04-30 05:58:43
8	Krzysztof Magda	1303	C#	2023-07-28 19:45:00
9	Mikael Fiala-Lundström	1800	C#	2021-04-22 21:27:49
10	Johan Pettersson	2083	C#	2018-04-23 14:41:18

#	User	Length	Language	Date
1	William Gan	377	C++	2018-12-03 10:32:24
2	Anatole HAGBE	441	C++	2023-08-20 18:10:55
3	Kim Jae Woo	472	C++	2018-10-25 02:54:36
4	Hidden user	506	C++	2019-05-06 11:31:20
5	Grae Yeandle	517	C++	2018-03-15 18:17:04
6	Markus Mathiasen	518	C++	2022-10-11 08:28:15
7	Tùng Hoàng Lâm	523	C++	2024-12-09 07:59:25
8	David Venhoek	534	C++	2018-05-13 18:44:46
9	Truong Luan	536	C++	2018-11-14 11:29:54
10	黄红滔	542	C++	2023-04-16 05:28:18

#	User	Length	Language	Date
1	Hidden user	650	Common Lisp	2019-07-18 04:46:37

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1435	F#	2022-10-10 19:42:57

#	User	Length	Language	Date
1	Resa Renaldy	1179	Go	2021-07-21 07:26:44
2	Norbert Voelker	1360	Go	2021-05-03 18:52:05

#	User	Length	Language	Date
1	Lim Ming Yean	715	Haskell	2019-03-08 15:15:14
2	Matthew Johnson	768	Haskell	2018-02-17 04:36:07
3	Hidden user	873	Haskell	2023-01-18 12:34:11
4	Jan Hrček	937	Haskell	2021-03-26 06:58:43
5	Brent Yorgey	1009	Haskell	2017-11-04 05:35:43
6	Steinar Simonnes	1051	Haskell	2024-02-19 09:23:39
7	Hidden user	1072	Haskell	2019-08-23 15:52:15
8	Håkon Flatval	1100	Haskell	2018-08-30 23:24:40
9	Hannah Dougherty	1139	Haskell	2019-05-10 01:55:47
10	Hannah Dougherty	1139	Haskell	2019-05-10 01:56:22

#	User	Length	Language	Date
1	Prakash Sanyasi	384	Java	2019-05-16 17:48:24
2	Ali Pervaiz	474	Java	2019-03-25 16:05:47
3	Michael Shi	499	Java	2021-10-30 23:53:08
4	Weitao Li	501	Java	2017-11-04 18:25:53
5	Theodoric Keith Lim	512	Java	2020-07-08 00:38:26
6	Stela Palii	518	Java	2017-12-23 19:24:35
7	Lam Nguyen	524	Java	2019-11-07 23:04:07
8	Nigel Quinn	538	Java	2018-01-27 21:46:53
9	Hidden user	543	Java	2018-06-05 00:20:34
10	Adam Evans	546	Java	2018-01-10 03:02:20

#	User	Length	Language	Date
1	Peter Kedemo	655	JavaScript (Node.js)	2019-12-27 20:53:13
2	Antonia Sisneros	887	JavaScript (Node.js)	2022-12-09 00:37:14
3	Chris Wong	1125	JavaScript (Node.js)	2021-03-16 22:05:48
4	Andoko Chandra	1146	JavaScript (Node.js)	2020-10-18 09:06:48

#	User	Length	Language	Date
1	Zach Tschetter	222	JavaScript (SpiderMonkey)	2025-02-02 02:58:36
2	Bjørn Chr. Soltvedt	235	JavaScript (SpiderMonkey)	2017-11-19 23:49:25
3	Christian Pilegaard Cederquist	326	JavaScript (SpiderMonkey)	2023-01-18 13:40:03
4	Peter Menyes	349	JavaScript (SpiderMonkey)	2021-09-09 16:53:03

#	User	Length	Language	Date
1	Timothy Gaede	795	Julia	2024-06-15 05:07:06

#	User	Length	Language	Date
1	Einar Kjellback	542	Kotlin	2019-12-16 10:51:13
2	David McKenzie	546	Kotlin	2021-09-15 16:52:40
3	Adam Rankin	666	Kotlin	2023-05-10 22:47:22
4	Ellis Tsung	677	Kotlin	2018-10-25 03:25:51
5	Hidden user	727	Kotlin	2017-11-25 06:35:43
6	Neil Harmon	757	Kotlin	2019-04-26 10:37:15
7	Jacob Huebner	1022	Kotlin	2020-04-19 08:18:41
8	Слава Гуляев	1109	Kotlin	2017-11-06 01:29:51
9	Gaurav Tyagi	1262	Kotlin	2018-11-22 21:32:28
10	Kiel Dowdle	1544	Kotlin	2021-03-22 06:35:45

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	247	Lua	2023-11-29 21:02:15

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1059	Pascal	2019-10-23 18:57:23

#	User	Length	Language	Date
1	Hakan Kjellerstrand	846	Prolog	2023-02-15 20:25:57

#	User	Length	Language	Date
1	Niklas Baumstark	145	Python 2	2016-11-09 21:11:18
2	Thomas Feld	150	Python 2	2019-09-02 11:10:58
3	Johan Wind	167	Python 2	2018-03-20 17:44:26
4	Eoin Davey	182	Python 2	2018-02-03 20:36:59
5	Wang Zhi Jian	191	Python 2	2019-05-07 14:28:12
6	Måns Magnusson	192	Python 2	2018-10-26 10:15:04
7	Lim Hong Hui Eugene	218	Python 2	2018-05-03 10:58:57
8	Yanmarshus Bachtiar	249	Python 2	2020-10-17 05:10:40
9	Maj Stenmark	252	Python 2	2019-10-21 22:54:50
10	Johan Lyts	265	Python 2	2019-07-19 21:22:08

#	User	Length	Language	Date
1	Benjamin Z White	98	Python 3	2023-05-17 22:48:21
2	Dries Wedda	124	Python 3	2023-05-08 13:38:32
3	Thibault Raffaillac	137	Python 3	2023-08-14 12:06:42
4	Noah Hessen Bjerke	141	Python 3	2022-12-19 18:28:00
5	Paul Swingle	148	Python 3	2022-12-11 00:14:01
6	Clement Oh	159	Python 3	2023-10-02 08:20:50
7	Yong Mao	166	Python 3	2023-01-24 01:54:54
8	Tai Tze Kin	166	Python 3	2024-05-05 21:42:55
9	Daniel Bogorad	167	Python 3	2025-09-01 19:45:05
10	Himanshu Kumar	168	Python 3	2023-07-17 20:17:27

#	User	Length	Language	Date
1	Thomas Feld	85	Ruby	2023-05-24 15:14:44

#	User	Length	Language	Date
1	Vincent Lagerros	409	Rust	2025-06-17 18:22:46
2	Freek van Keulen	597	Rust	2021-07-28 20:34:56
3	Magix	926	Rust	2021-12-28 18:11:24
4	Bas Dirks	934	Rust	2022-01-04 11:36:01
5	Akemi Izuko	1855	Rust	2023-09-06 23:14:22
6	Eric Pinter	3929	Rust	2021-11-27 01:45:06

Solution running time distribution