Problem A
Reachable Roads — Problem Statistics

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Submissions	8031
Accepted submissions	4017
Submission ratio	50.02%
Authors	3128
Full solves [?]	2877
Full solve Ratio	91.98%

#	User	Runtime	Language	Date
1	Eyleifur Bjarkason	0.00 s	C	2019-12-05 22:30:07
2	Zachariah Goldthorpe	0.01 s	C	2017-08-13 05:10:34
3	Charlie Bouthoorn	0.01 s	C	2019-05-10 13:23:04
4	Ivan Petrov	0.01 s	C	2020-02-03 09:14:02
5	Sambit Palit	0.01 s	C	2020-09-24 17:45:31
6	James Bang	0.01 s	C	2020-11-08 23:03:57
7	Hidden user	0.01 s	C	2020-12-02 15:58:39
8	Xiaochi Wang	0.01 s	C	2022-08-09 09:42:38
9	Mirel Cosulschi	0.01 s	C	2022-12-10 20:33:01
10	Guy Brusovansky	0.02 s	C	2025-02-16 17:34:39

#	User	Runtime	Language	Date
1	traxex	0.05 s	C#	2024-05-07 09:39:35
2	Nils Lenart	0.06 s	C#	2020-03-13 08:31:09
3	Chris Lipina	0.06 s	C#	2023-03-08 23:29:08
4	Roberto Rodriguez Giorgetti	0.06 s	C#	2024-10-02 17:24:19
5	Sean Thomas	0.06 s	C#	2025-04-05 21:29:22
6	Göran Andersson	0.08 s	C#	2022-05-28 02:21:39
7	Andriy Zyevakov	0.22 s	C#	2018-12-01 20:07:44
8	Mikael Fiala-Lundström	0.24 s	C#	2022-02-05 01:17:59

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Common Lisp	2019-07-12 17:43:22

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.10 s	F#	2023-01-14 08:47:18

#	User	Runtime	Language	Date
1	Lucas Pedroso	0.01 s	Go	2024-05-10 20:02:53
2	Ola Dahl	0.04 s	Go	2022-12-12 20:12:21
3	Norbert Voelker	0.10 s	Go	2021-07-14 12:39:20
4	Iker Lissarrague	0.15 s	Go	2022-04-20 05:17:51
5	Conor McGovern	0.40 s	Go	2019-05-11 18:21:02
6	Kristoffer Åhgren	0.56 s	Go	2017-07-08 17:52:08
7	Kyle Weaver	0.58 s	Go	2017-12-01 22:12:03

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.02 s	Haskell	2024-02-05 07:18:24
2	Jan Hrček	0.02 s	Haskell	2024-12-20 06:38:19
3	Amir Shukayev	0.14 s	Haskell	2021-01-20 04:00:17
4	Qi Ji	0.27 s	Haskell	2018-07-09 13:02:40
5	Hidden user	0.33 s	Haskell	2019-10-25 12:36:42
6	Daniel Brännvall	0.58 s	Haskell	2023-08-21 11:47:04

#	User	Runtime	Language	Date
1	Guangyi Zhou	0.05 s	Java	2024-12-16 13:06:39
2	Sven Rönnbäck	0.05 s	Java	2025-12-14 12:18:10
3	William Fiset	0.07 s	Java	2016-11-27 22:33:19
4	Paul Boddington	0.07 s	Java	2017-01-07 19:15:08
5	Mehdi Ichou	0.07 s	Java	2017-04-07 01:57:08
6	Samuel Klingström	0.07 s	Java	2017-09-25 21:39:52
7	Goh Hong Wei, Shawn	0.07 s	Java	2024-10-18 01:21:32
8	Boh Xiang You Basil	0.07 s	Java	2024-11-12 08:55:40
9	Nicholas Russell Saerang	0.08 s	Java	2021-04-03 20:29:18
10	Fong Kai Jie	0.08 s	Java	2024-11-09 08:30:38

#	User	Runtime	Language	Date
1	Thiago Felipe Bastos da Silva	0.15 s	JavaScript (Node.js)	2023-05-24 18:03:32
2	Chijioke Orabueze	0.15 s	JavaScript (Node.js)	2025-12-18 05:24:54
3	Hidden user	0.20 s	JavaScript (Node.js)	2022-07-13 07:21:57
4	Quinn Flavel	0.50 s	JavaScript (Node.js)	2020-10-22 14:45:30
5	Emil Clemedson	0.64 s	JavaScript (Node.js)	2021-08-30 09:37:45

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.05 s	JavaScript (SpiderMonkey)	2016-11-19 19:03:56
2	Jimmy Gustafsson	0.06 s	JavaScript (SpiderMonkey)	2022-08-23 10:35:52
3	Michael Laszlo	0.09 s	JavaScript (SpiderMonkey)	2016-11-07 20:20:02
4	Christian Pilegaard Cederquist	0.11 s	JavaScript (SpiderMonkey)	2023-03-03 09:08:43

#	User	Runtime	Language	Date
1	Ditlef Alexander Diseth	0.25 s	Kotlin	2020-03-03 09:49:33
2	Hidden user	0.28 s	Kotlin	2019-12-08 13:45:21
3	Phường Lên	0.30 s	Kotlin	2019-12-09 04:17:12
4	Jacob Stringer	0.38 s	Kotlin	2018-05-16 05:37:34
5	Dayan Ruben Gonzalez	0.38 s	Kotlin	2020-10-01 02:52:28
6	Jake Bounds	0.53 s	Kotlin	2024-10-11 19:23:12
7	Emil Wihlander	0.57 s	Kotlin	2024-08-01 23:07:23
8	Adam Rankin	0.66 s	Kotlin	2023-08-26 00:18:15
9	Neil Harmon	0.74 s	Kotlin	2019-07-08 13:31:01

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.05 s	Lua	2023-11-29 19:52:34

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.01 s	Pascal	2017-10-18 14:07:08

#	User	Runtime	Language	Date
1	Aarnav Srinivasan	0.07 s	Python 2	2022-07-17 15:23:39
2	Christofer Ohlsson	0.08 s	Python 2	2016-09-13 05:21:04
3	Ram Basnet	0.11 s	Python 2	2019-01-07 07:39:02
4	Maj Stenmark	0.11 s	Python 2	2019-11-09 14:37:51
5	Jesper Öqvist	0.12 s	Python 2	2018-10-28 15:54:31
6	Johann Ly	0.12 s	Python 2	2018-11-03 04:41:35
7	Thomas Feld	0.12 s	Python 2	2019-09-06 08:28:03
8	Guan Yang Ze	0.12 s	Python 2	2019-10-17 16:08:30
9	Andreas Björklund	0.12 s	Python 2	2019-12-15 15:40:49
10	Ethan Dickey	0.12 s	Python 2	2022-03-21 16:52:49

#	User	Runtime	Language	Date
1	Hidden user	0.06 s	Python 3	2019-04-18 13:39:45
2	Aamir Shivji	0.06 s	Python 3	2025-11-03 19:56:20
3	Lara Landauro	0.06 s	Python 3	2025-11-04 00:29:26
4	Subramanian Ramasamy	0.07 s	Python 3	2018-04-09 13:32:04
5	Vishal Mohanty	0.07 s	Python 3	2018-04-09 14:27:21
6	Got Yaoi	0.07 s	Python 3	2018-05-03 00:08:13
7	Mel Howard	0.07 s	Python 3	2018-10-29 16:20:56
8	mike	0.07 s	Python 3	2018-11-09 18:30:18
9	Ram Basnet	0.07 s	Python 3	2019-01-07 07:37:55
10	Ray Sim	0.07 s	Python 3	2019-04-09 07:24:12

#	User	Runtime	Language	Date
1	Artur Khuziakhmetov	0.00 s	Rust	2022-07-13 19:21:48
2	Lasse Grosbøl-Rais	0.00 s	Rust	2023-09-27 12:16:27
3	Egor Kulikov	0.00 s	Rust	2024-12-23 13:37:33
4	Vincent Lagerros	0.00 s	Rust	2025-02-17 10:24:55
5	Joe Blower	0.00 s	Rust	2025-08-18 00:12:17
6	Norman Putra	0.00 s	Rust	2025-11-08 08:43:01
7	Eric Pinter	0.01 s	Rust	2021-05-30 20:27:28
8	Bas Dirks	0.01 s	Rust	2022-07-10 13:50:53
9	Oskar Lindén	0.01 s	Rust	2022-08-23 13:19:09
10	Nicholas	0.01 s	Rust	2023-08-21 10:33:42

#	User	Runtime	Language	Date
1	Ștefan-Iulian Alecu	0.06 s	Visual Basic	2025-11-05 21:21:28

#	User	Length	Language	Date
1	Mirel Cosulschi	703	C	2022-12-10 20:33:01
2	Zachariah Goldthorpe	718	C	2017-08-13 05:10:34
3	Hidden user	819	C	2020-12-02 15:58:39
4	정승일	1106	C	2025-10-28 08:32:35
5	James Bang	1165	C	2020-11-08 23:03:57
6	Xiaochi Wang	1167	C	2022-08-09 09:42:38
7	Solomon Tikabo	1263	C	2025-03-10 18:29:49
8	Guy Brusovansky	1450	C	2025-02-16 17:34:39
9	Sambit Palit	1545	C	2020-09-24 17:45:31
10	Charlie Bouthoorn	4119	C	2019-05-10 13:23:04

#	User	Length	Language	Date
1	traxex	635	C#	2024-05-07 09:39:35
2	Göran Andersson	1008	C#	2022-05-28 02:21:39
3	Chris Lipina	1885	C#	2023-03-08 23:29:08
4	Roberto Rodriguez Giorgetti	1954	C#	2024-10-02 17:24:19
5	Sean Thomas	2082	C#	2025-04-05 21:29:22
6	Nils Lenart	3320	C#	2020-03-13 08:31:09
7	Mikael Fiala-Lundström	3470	C#	2022-02-05 01:17:59
8	Andriy Zyevakov	8749	C#	2018-12-01 20:07:44

#	User	Length	Language	Date
1	William Gan	425	C++	2018-04-16 13:41:07
2	Irvi Firqotul Aini	478	C++	2019-08-18 13:06:57
3	Hidden user	481	C++	2025-02-01 12:39:46
4	陳心誠	492	C++	2024-08-22 06:15:11
5	Lim An Jun	494	C++	2023-02-12 04:54:37
6	右可可	507	C++	2021-09-03 13:46:27
7	人外沙耶	516	C++	2020-11-17 08:37:53
8	Li Hong Sheng Gabriel	520	C++	2018-03-23 14:07:19
9	Yeung Man Tsung	520	C++	2022-11-18 13:26:12
10	Ragur Krishnan	534	C++	2017-08-10 20:07:51

#	User	Length	Language	Date
1	Hidden user	765	Common Lisp	2019-07-12 17:35:59

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1611	F#	2023-01-14 08:47:18

#	User	Length	Language	Date
1	Kristoffer Åhgren	920	Go	2017-07-08 17:52:08
2	Kyle Weaver	953	Go	2017-12-01 22:12:03
3	Conor McGovern	1065	Go	2019-05-11 18:21:02
4	Iker Lissarrague	1100	Go	2022-04-20 05:17:51
5	Lucas Pedroso	1107	Go	2024-05-10 20:02:53
6	Ola Dahl	1714	Go	2022-12-12 20:12:21
7	Norbert Voelker	2622	Go	2021-07-14 12:39:20

#	User	Length	Language	Date
1	Jan Hrček	280	Haskell	2024-12-20 06:38:19
2	Qi Ji	780	Haskell	2018-07-09 13:10:51
3	Daniel Brännvall	852	Haskell	2023-08-21 11:47:04
4	Amir Shukayev	1565	Haskell	2021-01-20 04:00:17
5	Steinar Simonnes	2317	Haskell	2024-02-05 07:18:24
6	Hidden user	11114	Haskell	2019-10-25 12:36:42

#	User	Length	Language	Date
1	Rezwan Arefin	707	Java	2021-07-20 15:44:56
2	Pedro Contipelli	770	Java	2017-02-09 17:21:05
3	Kyar Nyo Aye	809	Java	2018-03-23 16:51:50
4	Mouhssine Assaoud	815	Java	2017-10-13 21:15:23
5	Alexandre Maniet	848	Java	2018-10-30 08:39:37
6	Doug Goodman	858	Java	2018-04-14 15:11:06
7	Nash Kraemer	864	Java	2024-03-01 00:55:14
8	Wu Songnie	889	Java	2017-09-25 23:09:38
9	Hidden user	889	Java	2022-04-30 21:35:58
10	Koh Zhi Quan, Brandon	889	Java	2024-11-01 02:56:00

#	User	Length	Language	Date
1	Thiago Felipe Bastos da Silva	1067	JavaScript (Node.js)	2023-05-24 18:03:32
2	Quinn Flavel	1158	JavaScript (Node.js)	2020-10-22 14:45:30
3	Chijioke Orabueze	1370	JavaScript (Node.js)	2025-12-18 05:24:54
4	Emil Clemedson	1780	JavaScript (Node.js)	2021-08-30 09:37:45
5	Hidden user	2032	JavaScript (Node.js)	2022-07-13 07:21:57

#	User	Length	Language	Date
1	Jimmy Gustafsson	909	JavaScript (SpiderMonkey)	2022-08-23 10:35:52
2	Christian Pilegaard Cederquist	996	JavaScript (SpiderMonkey)	2023-03-03 09:08:43
3	Michael Laszlo	1276	JavaScript (SpiderMonkey)	2016-11-07 20:20:02
4	Bjørn Chr. Soltvedt	5809	JavaScript (SpiderMonkey)	2016-11-19 19:03:56

#	User	Length	Language	Date
1	Dayan Ruben Gonzalez	664	Kotlin	2020-10-01 02:52:28
2	Phường Lên	881	Kotlin	2019-12-09 04:17:12
3	Jacob Stringer	1031	Kotlin	2018-05-16 05:37:34
4	Adam Rankin	1157	Kotlin	2023-08-26 00:18:15
5	Jake Bounds	1215	Kotlin	2024-10-11 19:23:12
6	Emil Wihlander	1297	Kotlin	2024-08-01 23:07:23
7	Hidden user	1549	Kotlin	2019-12-08 13:45:21
8	Neil Harmon	1823	Kotlin	2019-07-08 13:31:01
9	Ditlef Alexander Diseth	3363	Kotlin	2020-03-03 09:49:33

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	1281	Lua	2023-11-29 19:52:34

#	User	Length	Language	Date
1	Ingemar Ragnemalm	3991	Pascal	2017-10-18 14:07:08

#	User	Length	Language	Date
1	Thomas Feld	395	Python 2	2019-09-06 08:28:03
2	Andreas Björklund	482	Python 2	2019-12-15 15:40:49
3	Lars Åström	559	Python 2	2019-10-07 07:18:06
4	Guan Yang Ze	563	Python 2	2019-10-17 16:08:30
5	Jesper Öqvist	610	Python 2	2018-10-28 15:54:31
6	Olav Røthe Bakken	663	Python 2	2020-03-03 10:04:53
7	Johann Ly	665	Python 2	2018-11-03 04:41:35
8	Maj Stenmark	717	Python 2	2019-11-09 14:37:51
9	Christofer Ohlsson	833	Python 2	2016-09-13 05:21:04
10	Wyatt Wismer	967	Python 2	2017-01-18 04:36:25

#	User	Length	Language	Date
1	Michael Goldwasser	266	Python 3	2024-10-10 04:58:50
2	Oh Yi Xiu, Wilson	286	Python 3	2024-01-27 09:50:52
3	Kelly Dance	301	Python 3	2022-11-02 15:25:04
4	Farzam Abrishami	308	Python 3	2024-01-20 15:19:12
5	Ahmed Chamseddine	331	Python 3	2024-07-23 09:15:18
6	Hedelito Dollison	342	Python 3	2023-11-24 15:02:28
7	Oskar Haarklou Veileborg	356	Python 3	2020-02-11 15:05:20
8	Asbjørn Lind	360	Python 3	2025-01-13 13:45:43
9	Hrant Hovhannisyan	363	Python 3	2025-12-27 03:46:51
10	Yu Ting Yeh	366	Python 3	2025-05-06 11:00:53

#	User	Length	Language	Date
1	Artur Khuziakhmetov	1255	Rust	2022-07-13 19:35:27
2	Miguel Buzato	1261	Rust	2024-05-10 18:21:29
3	Nicholas	1341	Rust	2023-08-21 10:33:42
4	Sherman Chann Zhi Shen	1554	Rust	2021-09-09 05:10:51
5	Simon Hallefält	1558	Rust	2023-09-06 16:24:00
6	Jeff Zhang	1654	Rust	2024-12-07 23:21:22
7	Norman Putra	1880	Rust	2025-11-08 08:43:01
8	Lasse Grosbøl-Rais	1971	Rust	2023-09-27 12:05:42
9	James Felder	2080	Rust	2024-09-12 21:43:16
10	Eric Pinter	2115	Rust	2021-05-30 20:27:28

#	User	Length	Language	Date
1	Ștefan-Iulian Alecu	1086	Visual Basic	2025-11-05 21:21:28

Solution running time distribution