Problem A
Neighborhood Watch — Problem Statistics

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Submissions	2768
Accepted submissions	1033
Submission ratio	37.32%
Authors	895
Full solves [?]	788
Full solve Ratio	88.04%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.12 s	Bash	2024-04-16 16:03:26

#	User	Runtime	Language	Date
1	Jón Steinn Elíasson	0.00 s	C	2024-08-25 00:07:33
2	Bergur Snorrason	0.01 s	C	2019-11-22 08:58:57
3	SiBi	0.02 s	C	2019-04-07 07:54:58
4	Miranda Henry	0.02 s	C	2019-09-26 20:08:02
5	Hidden user	0.02 s	C	2020-05-03 18:19:06
6	vance	0.02 s	C	2020-05-06 19:23:14
7	Sambit Palit	0.02 s	C	2020-11-21 04:48:51
8	Mirel Cosulschi	0.02 s	C	2023-01-04 16:55:00
9	Hidden user	0.02 s	C	2023-07-11 01:09:18
10	Jordan Perry	0.02 s	C	2024-10-11 23:05:27

#	User	Runtime	Language	Date
1	Garðar Ingvarsson	0.00 s	C++	2019-04-10 00:51:12
2	Frank Endriss	0.00 s	C++	2020-01-06 22:30:59
3	Agis Daniels	0.00 s	C++	2020-03-14 16:03:07
4	Geralt of Rivia	0.00 s	C++	2022-08-02 04:04:45
5	Noah Weninger	0.01 s	C++	2018-12-21 00:47:44
6	Chenzhang Hu	0.01 s	C++	2019-10-24 18:50:06
7	sicupu	0.01 s	C++	2022-08-20 08:44:02
8	Lago Duria	0.01 s	C++	2022-10-14 16:35:11
9	Zong Yu Lee	0.01 s	C++	2022-12-23 08:47:38
10	Leszek Hanusiak	0.01 s	C++	2023-06-08 19:36:44

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.07 s	Go	2018-12-26 19:30:04
2	Norbert Voelker	0.09 s	Go	2021-12-12 19:43:18

#	User	Runtime	Language	Date
1	Tim Put	0.01 s	Haskell	2021-03-26 23:37:05
2	Brent Yorgey	0.32 s	Haskell	2019-01-02 21:32:18
3	Joshua Coward	0.35 s	Haskell	2022-01-02 21:22:52
4	Intrets	0.44 s	Haskell	2019-08-17 22:38:45
5	Matthew Regehr	0.47 s	Haskell	2018-11-23 23:34:44

#	User	Runtime	Language	Date
1	Crystal Sharpe	0.08 s	Java	2020-08-26 09:25:40
2	Bjørn Dons	0.11 s	Java	2019-08-17 22:32:27
3	Hidden user	0.11 s	Java	2019-10-28 21:37:19
4	Ahmad Barhamje	0.12 s	Java	2019-05-11 20:09:44
5	Hidden user	0.14 s	Java	2018-11-03 17:28:04
6	Keegan Millard	0.14 s	Java	2018-11-03 18:59:28
7	Sam Reinehr	0.14 s	Java	2018-11-04 04:47:11
8	Hidden user	0.15 s	Java	2018-11-03 17:19:21
9	Olivia Bizimungu	0.16 s	Java	2020-05-10 23:40:27
10	Shawn Ho	0.16 s	Java	2022-02-19 14:55:57

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.08 s	JavaScript (SpiderMonkey)	2023-05-30 02:28:09
2	Bjørn Chr. Soltvedt	0.09 s	JavaScript (SpiderMonkey)	2019-03-01 13:09:11

#	User	Runtime	Language	Date
1	Hidden user	0.42 s	Julia	2025-03-16 21:34:56
2	Timothy Gaede	0.58 s	Julia	2024-08-20 11:06:29

#	User	Runtime	Language	Date
1	Jacob Huebner	0.17 s	Kotlin	2021-10-21 00:54:36
2	Nicholas Johnson	0.29 s	Kotlin	2021-10-19 05:56:18
3	Adam Rankin	0.35 s	Kotlin	2023-10-23 18:11:10
4	Adam Koprowski	0.57 s	Kotlin	2021-06-28 19:29:35
5	Nithin Chalapathi	0.67 s	Kotlin	2018-11-03 20:21:21

#	User	Runtime	Language	Date
1	Greg Gorlen	0.05 s	PHP	2023-02-23 01:13:26

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.33 s	Prolog	2019-04-26 20:03:01

#	User	Runtime	Language	Date
1	Hermon Mulat	0.05 s	Python 2	2018-12-26 04:07:40
2	Agis Daniels	0.05 s	Python 2	2020-03-14 16:07:11
3	Yanmarshus Bachtiar	0.06 s	Python 2	2020-11-23 02:49:39
4	Måns Magnusson	0.08 s	Python 2	2018-11-08 23:08:17
5	Maj Stenmark	0.08 s	Python 2	2018-11-12 23:00:24
6	Jesper Öqvist	0.08 s	Python 2	2019-08-11 16:14:31
7	Thomas Feld	0.08 s	Python 2	2019-10-16 16:27:56
8	Andreas Björklund	0.08 s	Python 2	2020-10-23 17:33:45
9	Johan Lyts	0.09 s	Python 2	2020-03-05 21:33:16

#	User	Runtime	Language	Date
1	Hidden user	0.06 s	Python 3	2025-04-29 22:31:06
2	Giulio Manuzzi	0.07 s	Python 3	2022-10-12 12:06:01
3	Jed Yang	0.07 s	Python 3	2025-01-03 16:23:30
4	Hidden user	0.07 s	Python 3	2025-07-26 13:08:04
5	Russell	0.07 s	Python 3	2025-09-21 10:11:56
6	John Swingle	0.08 s	Python 3	2022-02-12 01:20:07
7	Ahmed Siadomar	0.08 s	Python 3	2023-02-22 06:14:47
8	Hidden user	0.08 s	Python 3	2025-04-29 22:42:11
9	Jiaming Kong	0.08 s	Python 3	2025-07-09 22:42:05
10	Ethan	0.08 s	Python 3	2025-07-20 18:47:38

#	User	Runtime	Language	Date
1	Miorel Palii	0.13 s	Ruby	2018-11-04 17:03:58
2	Thomas Feld	0.14 s	Ruby	2023-02-28 15:07:07
3	Hidden user	0.14 s	Ruby	2023-07-11 01:03:41

#	User	Runtime	Language	Date
1	Jakub Jagiello	0.01 s	Rust	2020-07-11 14:00:08
2	Klas af Geijerstam	0.01 s	Rust	2020-07-11 15:41:14
3	Muhammad Rais Fathin Mudzakir	0.01 s	Rust	2021-05-29 20:01:21
4	Gabriella Gloria	0.02 s	Rust	2025-04-23 17:32:31
5	Mckinley Xie	0.03 s	Rust	2025-04-29 22:56:54
6	Aram Ebtekar	0.04 s	Rust	2019-05-11 20:47:15

#	User	Length	Language	Date
1	Chenzhang Hu	1498	Bash	2024-04-16 16:03:26

#	User	Length	Language	Date
1	Hidden user	226	C	2023-07-11 10:13:54
2	Hidden user	269	C	2020-05-03 18:19:06
3	Jón Steinn Elíasson	334	C	2024-08-25 00:00:57
4	vance	369	C	2020-05-06 19:23:14
5	Mirel Cosulschi	398	C	2023-01-04 16:55:00
6	SiBi	402	C	2019-04-07 07:54:58
7	Sambit Palit	457	C	2020-11-21 04:48:51
8	Miranda Henry	502	C	2019-09-26 20:08:02
9	Jordan Perry	1054	C	2024-10-11 23:05:27
10	Bergur Snorrason	1793	C	2019-11-22 08:58:57

#	User	Length	Language	Date
1	Frans Meulenbroeks	220	C++	2024-10-18 19:23:29
2	Ahmed Hibet	272	C++	2020-11-30 03:44:37
3	2 0 3 7 MD. ASHABUL YAMIN	279	C++	2024-09-19 15:36:08
4	Taylor Bradshaw	290	C++	2018-11-04 03:18:27
5	T1C WLP	290	C++	2020-11-17 02:06:46
6	Francesco Maria Petrangeli	293	C++	2024-10-16 15:54:12
7	Hidden user	296	C++	2024-10-18 12:58:05
8	Hidden user	297	C++	2020-05-03 18:16:54
9	2076 - Mahmodol Hassan Monna	301	C++	2024-09-16 13:43:02
10	Jenn Pang Chow	306	C++	2018-11-14 14:53:30

#	User	Length	Language	Date
1	Jinwoo Lee	507	Go	2018-12-26 19:30:04
2	Norbert Voelker	1151	Go	2021-12-12 19:43:18

#	User	Length	Language	Date
1	Matthew Regehr	248	Haskell	2018-11-23 23:34:44
2	Joshua Coward	339	Haskell	2022-01-02 21:22:52
3	Intrets	375	Haskell	2019-08-17 22:38:45
4	Tim Put	468	Haskell	2021-03-26 22:40:23
5	Brent Yorgey	830	Haskell	2019-01-02 21:32:18

#	User	Length	Language	Date
1	Sophia Khalis	384	Java	2020-04-23 19:21:14
2	Caeden Whitaker	401	Java	2020-07-07 01:29:37
3	Jacob Minder	416	Java	2024-04-09 04:29:14
4	Josh Wozniak	433	Java	2019-10-26 18:38:16
5	Fiona Barry	443	Java	2019-10-27 00:28:19
6	Duncan Page	459	Java	2019-10-14 23:33:17
7	Loi Phuc Nguyen	468	Java	2023-08-30 04:19:06
8	Qianlang Chen	486	Java	2019-11-24 00:50:11
9	Pedro Contipelli	497	Java	2019-10-26 21:03:25
10	Matt Peter	515	Java	2019-02-21 05:25:54

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	340	JavaScript (SpiderMonkey)	2019-03-01 13:09:11
2	Christian Pilegaard Cederquist	397	JavaScript (SpiderMonkey)	2023-05-30 02:28:09

#	User	Length	Language	Date
1	Hidden user	279	Julia	2025-03-16 21:34:56
2	Timothy Gaede	713	Julia	2024-08-20 11:06:29

#	User	Length	Language	Date
1	Adam Rankin	515	Kotlin	2023-10-23 18:11:10
2	Adam Koprowski	605	Kotlin	2021-06-28 19:29:35
3	Nithin Chalapathi	1003	Kotlin	2018-11-03 20:21:21
4	Jacob Huebner	1138	Kotlin	2021-10-21 00:54:36
5	Nicholas Johnson	2249	Kotlin	2021-10-19 05:56:18

#	User	Length	Language	Date
1	Greg Gorlen	427	PHP	2023-02-23 01:13:26

#	User	Length	Language	Date
1	Andriy Zyevakov	714	Prolog	2019-04-26 20:03:01

#	User	Length	Language	Date
1	Thomas Feld	154	Python 2	2019-10-16 16:27:56
2	Måns Magnusson	197	Python 2	2018-11-08 23:08:17
3	Jesper Öqvist	215	Python 2	2019-08-11 16:14:31
4	Andreas Björklund	234	Python 2	2020-10-23 17:33:45
5	Johan Lyts	274	Python 2	2020-03-05 21:33:16
6	Agis Daniels	274	Python 2	2020-03-14 16:07:11
7	Maj Stenmark	376	Python 2	2018-11-12 23:00:24
8	Hermon Mulat	393	Python 2	2018-12-26 04:07:40
9	Yanmarshus Bachtiar	414	Python 2	2020-11-23 02:49:39

#	User	Length	Language	Date
1	Benjamin Z White	106	Python 3	2023-04-21 13:44:08
2	Josip Smolcic	136	Python 3	2018-11-06 07:41:18
3	Matteo D'Agostino	145	Python 3	2022-10-13 00:11:15
4	Lee Isaac	147	Python 3	2023-05-12 11:06:31
5	Clement Oh	147	Python 3	2023-09-22 17:14:27
6	Daniel Bogorad	151	Python 3	2025-07-23 17:29:10
7	Yong Mao	152	Python 3	2022-12-02 03:37:20
8	Victor Zheng	153	Python 3	2018-11-03 22:00:38
9	Hidden user	154	Python 3	2024-01-19 17:25:10
10	Kevin Chen	155	Python 3	2018-11-10 03:30:00

#	User	Length	Language	Date
1	Thomas Feld	64	Ruby	2023-02-28 15:12:19
2	Hidden user	249	Ruby	2023-07-11 01:03:41
3	Miorel Palii	273	Ruby	2018-11-04 17:03:58

#	User	Length	Language	Date
1	Klas af Geijerstam	726	Rust	2020-07-11 15:25:55
2	Aram Ebtekar	1225	Rust	2019-05-11 20:47:15
3	Jakub Jagiello	1237	Rust	2020-07-11 15:32:49
4	Mckinley Xie	1414	Rust	2025-04-29 22:56:54
5	Gabriella Gloria	1481	Rust	2025-04-23 17:32:31
6	Muhammad Rais Fathin Mudzakir	4157	Rust	2021-05-29 20:00:28

Solution running time distribution