Problem A
Safe Houses — Problem Statistics

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Submissions	1827
Accepted submissions	904
Submission ratio	49.48%
Authors	860
Full solves [?]	775
Full solve Ratio	90.12%

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	C	2025-01-22 16:27:46
2	Naveen Kumar S	0.00 s	C	2025-04-17 15:43:55
3	Bergur Snorrason	0.02 s	C	2019-11-13 10:42:13
4	Stephen Downward	0.04 s	C	2019-03-16 18:40:16
5	Spencer Killen	0.04 s	C	2019-03-16 19:34:19
6	Ivan Petrov	0.04 s	C	2019-03-22 10:38:06
7	Henry Rice	0.04 s	C	2019-08-27 18:22:49
8	Eyleifur Bjarkason	0.04 s	C	2019-11-26 20:49:38
9	Sambit Palit	0.04 s	C	2020-11-09 23:05:31
10	Reepca Russelstein	0.13 s	C	2019-03-16 22:15:03

#	User	Runtime	Language	Date
1	Reed Anderson	0.19 s	C#	2019-03-23 18:02:50
2	Jakub Jarząbek	0.21 s	C#	2020-11-05 23:06:15
3	Mikael Fiala-Lundström	0.23 s	C#	2021-11-06 17:54:14
4	Ben Thompson	0.27 s	C#	2019-03-23 19:31:17
5	Adam Grady	0.28 s	C#	2021-09-13 21:17:27
6	Benjamin Bilbeau	0.32 s	C#	2024-01-08 17:48:20
7	Brad Beise	0.32 s	C#	2024-01-12 14:55:44
8	Emmanuel Adeniji	0.33 s	C#	2019-03-23 19:29:33
9	Hidden user	0.34 s	C#	2019-03-23 19:02:41
10	Caden Waters	0.35 s	C#	2019-03-23 19:20:32

#	User	Runtime	Language	Date
1	Hidden user	0.40 s	Common Lisp	2019-06-23 00:26:54

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.91 s	F#	2023-02-11 17:16:20

#	User	Runtime	Language	Date
1	Norbert Voelker	0.28 s	Go	2021-09-13 22:17:58

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.50 s	Haskell	2024-05-13 13:13:48
2	Kristian Sørdal	0.52 s	Haskell	2023-01-18 09:42:19
3	Hidden user	1.19 s	Haskell	2023-01-07 14:31:29

#	User	Runtime	Language	Date
1	Steven Cheng	0.07 s	Java	2020-05-01 02:17:23
2	Bjørn Dons	0.09 s	Java	2019-09-23 20:52:57
3	Morten Flensborg Jensen	0.09 s	Java	2020-04-03 20:18:45
4	Karam Alkontar	0.10 s	Java	2019-03-16 17:26:22
5	Benjamin Reidys	0.10 s	Java	2019-03-16 23:47:57
6	Brent Yorgey	0.10 s	Java	2019-12-31 23:51:10
7	William Quiroga	0.11 s	Java	2019-03-19 19:27:33
8	Ali Orooji	0.12 s	Java	2022-10-19 20:43:08
9	Crystal Sharpe	0.13 s	Java	2020-02-26 05:34:35
10	Blake Gassman	0.13 s	Java	2022-02-19 20:10:08

#	User	Runtime	Language	Date
1	Griffin Tomaszewski	0.22 s	JavaScript (Node.js)	2025-01-07 00:11:04
2	Peter Kedemo	0.54 s	JavaScript (Node.js)	2019-12-30 22:09:01
3	Alex Wendte	1.14 s	JavaScript (Node.js)	2019-03-24 00:46:30
4	Ismail Tahiri	1.33 s	JavaScript (Node.js)	2020-07-27 10:27:40

#	User	Runtime	Language	Date
1	Jimmy Gustafsson	0.04 s	JavaScript (SpiderMonkey)	2025-07-17 15:25:57
2	Bjørn Chr. Soltvedt	0.16 s	JavaScript (SpiderMonkey)	2019-03-17 15:08:02
3	Christian Pilegaard Cederquist	0.19 s	JavaScript (SpiderMonkey)	2023-04-21 21:47:10

#	User	Runtime	Language	Date
1	Noszály Csaba	0.66 s	Julia	2025-03-02 09:23:51
2	Timothy Gaede	0.70 s	Julia	2024-04-23 15:26:13

#	User	Runtime	Language	Date
1	Hidden user	0.32 s	Kotlin	2019-12-27 01:37:00
2	Adam Rankin	0.38 s	Kotlin	2023-05-07 07:07:17
3	Stephen Atwood	0.38 s	Kotlin	2024-04-02 19:28:25
4	Thanh Le	0.45 s	Kotlin	2021-07-06 06:08:34

#	User	Runtime	Language	Date
1	Maj Stenmark	0.05 s	Python 2	2019-09-17 17:49:40
2	Jonatan Nilsson	0.06 s	Python 2	2019-09-17 17:16:26
3	Lars Åström	0.06 s	Python 2	2019-09-18 15:47:35
4	Carter Nelson	0.24 s	Python 2	2019-03-23 17:48:19
5	Herbert Ilhan Tanujaya	0.24 s	Python 2	2019-05-10 15:30:09
6	Johann Ly	0.25 s	Python 2	2019-03-16 17:30:46
7	Victoria Guenter	0.27 s	Python 2	2019-03-16 21:36:15
8	Johan Lyts	0.30 s	Python 2	2021-02-09 14:29:23
9	Stephen (Joe) Malone	0.33 s	Python 2	2019-03-23 18:33:29
10	Saeed Askari	0.34 s	Python 2	2019-03-16 17:17:43

#	User	Runtime	Language	Date
1	Jason Yuen	0.04 s	Python 3	2019-03-16 17:18:34
2	Jakob Kallestad	0.04 s	Python 3	2019-06-23 18:37:25
3	Alwin Peng	0.04 s	Python 3	2019-09-21 22:50:46
4	Finn Lidbetter	0.05 s	Python 3	2019-03-17 17:25:39
5	Vincent Tandya	0.05 s	Python 3	2019-03-23 20:26:13
6	Dominic Berzin Chua Way Gin	0.05 s	Python 3	2025-04-17 13:57:15
7	Jason Yin	0.06 s	Python 3	2025-01-20 06:01:49
8	Thomas Craddock	0.06 s	Python 3	2025-04-19 03:39:54
9	Preston Agoawike	0.06 s	Python 3	2025-04-20 00:12:18
10	Kariv Gorkoff	0.06 s	Python 3	2025-04-22 23:56:49

#	User	Runtime	Language	Date
1	Niklas Sandén	0.00 s	Rust	2023-02-04 14:48:13
2	Vincent Lagerros	0.00 s	Rust	2025-08-05 19:03:45
3	Marcus Persson	0.01 s	Rust	2025-08-24 11:05:28
4	Klas af Geijerstam	0.02 s	Rust	2020-11-18 09:25:14
5	Bas Dirks	0.04 s	Rust	2022-01-21 10:33:54
6	Hidden user	0.04 s	Rust	2023-06-04 18:29:52
7	Pahlevi Fikri Auliya	0.05 s	Rust	2020-11-19 01:17:43

#	User	Length	Language	Date
1	Stephen Downward	939	C	2019-03-16 18:40:16
2	Henry Rice	1013	C	2019-08-27 18:22:49
3	Spencer Killen	1140	C	2019-03-16 19:34:19
4	Sambit Palit	1302	C	2020-11-09 23:05:31
5	Ivan Petrov	1385	C	2019-03-22 10:38:06
6	Naveen Kumar S	1739	C	2025-04-17 15:43:55
7	Bergur Snorrason	1896	C	2019-11-13 10:40:49
8	Hidden user	1930	C	2025-01-22 16:27:46
9	Reepca Russelstein	2004	C	2019-03-16 22:15:03
10	Eyleifur Bjarkason	6437	C	2019-11-26 20:49:58

#	User	Length	Language	Date
1	Adam Grady	1360	C#	2021-09-13 21:17:27
2	Hidden user	1551	C#	2019-03-23 19:02:41
3	Caden Waters	1615	C#	2019-03-23 19:20:32
4	Ben Thompson	1659	C#	2019-03-23 19:31:17
5	Reed Anderson	1660	C#	2019-03-23 18:02:50
6	Steve Williams	1679	C#	2024-01-09 01:02:00
7	Benjamin Bilbeau	1682	C#	2024-01-08 17:48:20
8	Brad Beise	1730	C#	2024-01-12 14:55:44
9	Mikael Fiala-Lundström	2099	C#	2021-11-06 17:54:14
10	Lev Nikolaj Kavs	2139	C#	2019-03-23 20:47:37

#	User	Length	Language	Date
1	Luis Murillo	560	C++	2019-03-16 17:30:03
2	Ryan Chew	562	C++	2019-03-19 16:13:35
3	Bezaliel Silva	568	C++	2019-03-16 17:27:02
4	陳連恩	573	C++	2021-07-15 10:35:12
5	Jonathan Ramirez	585	C++	2019-03-16 22:38:06
6	Anshil Gandhi	597	C++	2019-05-06 18:07:41
7	Michael Pfeifer	601	C++	2019-03-16 17:34:44
8	Hyunjun Lee	605	C++	2022-11-23 13:03:27
9	Shen Guanglong	606	C++	2024-05-07 08:32:02
10	José Gabriel Pereira	610	C++	2019-03-16 17:41:05

#	User	Length	Language	Date
1	Hidden user	459	Common Lisp	2019-06-23 00:26:54

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	950	F#	2023-02-11 17:16:20

#	User	Length	Language	Date
1	Norbert Voelker	1276	Go	2021-09-13 22:17:58

#	User	Length	Language	Date
1	Hidden user	686	Haskell	2023-01-07 14:31:29
2	Steinar Simonnes	1138	Haskell	2024-05-13 13:11:50
3	Kristian Sørdal	1250	Haskell	2023-01-18 09:42:19

#	User	Length	Language	Date
1	Arup Ratan Guha	794	Java	2021-02-17 15:12:44
2	Joseph Durie	823	Java	2019-03-16 17:22:28
3	Andy Phan	832	Java	2019-03-19 19:35:55
4	Lior Barak	929	Java	2019-03-16 17:08:39
5	Brennan Cleland	956	Java	2022-10-20 21:43:30
6	Caleb Reath	969	Java	2019-03-16 18:37:44
7	Santosh Gupta	987	Java	2019-03-16 19:29:21
8	Michael Waller	990	Java	2019-03-16 17:57:31
9	Michael Scott	1002	Java	2020-09-10 21:44:59
10	Syed AbuTalib	1014	Java	2020-03-25 00:27:35

#	User	Length	Language	Date
1	Ismail Tahiri	915	JavaScript (Node.js)	2020-07-27 10:59:42
2	Peter Kedemo	957	JavaScript (Node.js)	2019-12-30 22:09:01
3	Alex Wendte	1218	JavaScript (Node.js)	2019-03-24 00:52:50
4	Griffin Tomaszewski	2106	JavaScript (Node.js)	2025-01-07 00:11:04

#	User	Length	Language	Date
1	Jimmy Gustafsson	460	JavaScript (SpiderMonkey)	2025-07-17 15:25:57
2	Christian Pilegaard Cederquist	519	JavaScript (SpiderMonkey)	2023-04-21 21:49:13
3	Bjørn Chr. Soltvedt	524	JavaScript (SpiderMonkey)	2019-03-17 15:08:02

#	User	Length	Language	Date
1	Noszály Csaba	1014	Julia	2025-03-02 09:23:51
2	Timothy Gaede	1476	Julia	2024-04-23 15:26:13

#	User	Length	Language	Date
1	Stephen Atwood	613	Kotlin	2024-04-02 19:28:25
2	Thanh Le	737	Kotlin	2021-07-06 06:08:34
3	Adam Rankin	1389	Kotlin	2023-05-07 07:07:17
4	Hidden user	1399	Kotlin	2019-12-27 01:37:00

#	User	Length	Language	Date
1	Saeed Askari	300	Python 2	2019-03-16 17:17:43
2	Johan Lyts	337	Python 2	2021-02-09 14:29:23
3	Stephen (Joe) Malone	352	Python 2	2019-03-23 18:33:29
4	Herbert Ilhan Tanujaya	364	Python 2	2019-05-10 15:30:09
5	Victoria Guenter	410	Python 2	2019-03-16 21:36:15
6	Andreas Björklund	426	Python 2	2019-06-27 17:53:27
7	Daniel Wolff	432	Python 2	2019-03-16 18:16:51
8	Hidden user	461	Python 2	2019-07-22 18:51:45
9	Carter Nelson	492	Python 2	2019-03-23 17:48:19
10	Yanmarshus Bachtiar	513	Python 2	2020-09-11 06:50:48

#	User	Length	Language	Date
1	Nino Bašić	167	Python 3	2023-01-07 12:56:41
2	Teikn Smith	179	Python 3	2021-11-19 22:53:06
3	Thomas Feld	216	Python 3	2022-08-29 13:20:31
4	Ahmed Chamseddine	216	Python 3	2024-09-06 10:59:25
5	Farzam Abrishami	228	Python 3	2023-12-24 15:24:31
6	Eduardo Vicente Petry	232	Python 3	2023-01-26 07:47:06
7	Thibault Raffaillac	277	Python 3	2021-12-02 18:14:55
8	Yong Mao	300	Python 3	2023-05-14 04:22:17
9	Oskar Haarklou Veileborg	313	Python 3	2020-02-28 13:43:16
10	Christian Blumenthal	329	Python 3	2023-07-05 14:23:55

#	User	Length	Language	Date
1	Bas Dirks	779	Rust	2022-01-21 10:33:54
2	Marcus Persson	1113	Rust	2025-08-24 11:05:28
3	Vincent Lagerros	1300	Rust	2025-08-05 19:03:45
4	Hidden user	1382	Rust	2023-06-04 18:29:52
5	Pahlevi Fikri Auliya	2386	Rust	2020-11-19 01:17:43
6	Klas af Geijerstam	6048	Rust	2020-11-18 09:25:14
7	Niklas Sandén	26653	Rust	2023-02-04 14:48:13

Solution running time distribution