Problem I
Virtual Friends — Problem Statistics

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Submissions	14637
Accepted submissions	3707
Submission ratio	25.33%
Authors	3081
Full solves [?]	2346
Full solve Ratio	76.14%

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	C	2016-05-15 17:11:53
2	Sabit Zahin	0.02 s	C	2015-10-20 18:26:12
3	Maksim Bober	0.03 s	C	2016-09-30 22:01:52
4	Hidden user	0.03 s	C	2017-05-01 04:35:29
5	Hidden user	0.03 s	C	2017-05-01 07:09:21
6	Oscar Cusin	0.04 s	C	2024-02-01 09:37:35
7	Hidden user	0.04 s	C	2024-02-14 22:08:34
8	Hidden user	0.04 s	C	2024-02-21 09:01:51
9	Mirel Cosulschi	0.07 s	C	2022-11-14 11:43:37
10	pengin	0.16 s	C	2022-03-22 10:56:16

#	User	Runtime	Language	Date
1	Anders Petersen	0.17 s	C#	2022-09-14 08:44:45
2	Wojciech Borowiecki	0.28 s	C#	2017-03-07 03:40:50
3	Ben-Richard Ebbesvik	0.28 s	C#	2024-01-04 23:37:22
4	Андрей Титов	0.32 s	C#	2015-12-29 08:07:42
5	Seth Kitchen	0.34 s	C#	2018-02-25 02:39:21
6	traxex	0.41 s	C#	2024-05-06 17:09:14
7	Jayant Notani	0.53 s	C#	2020-03-27 21:21:21
8	German A.	0.54 s	C#	2025-06-21 01:14:26
9	Nicolai	0.54 s	C#	2025-11-18 23:24:11
10	Frankie Chen	0.66 s	C#	2019-07-30 16:20:57

#	User	Runtime	Language	Date
1	Agis Daniels	0.02 s	C++	2021-12-12 13:03:26
2	Edgardo Deza	0.03 s	C++	2015-08-31 01:09:26
3	Hidden user	0.03 s	C++	2017-04-13 16:55:13
4	Jonas Nockert	0.03 s	C++	2017-05-15 12:23:13
5	Hidden user	0.03 s	C++	2017-09-29 00:10:08
6	Ebou Jobe	0.03 s	C++	2017-09-29 07:03:33
7	Naufal Makarim	0.03 s	C++	2017-11-19 15:46:14
8	Marouen Helali	0.03 s	C++	2017-11-25 14:06:06
9	Owen Li	0.03 s	C++	2018-02-10 01:24:45
10	Blair Du	0.03 s	C++	2018-02-12 01:11:47

#	User	Runtime	Language	Date
1	Patrick Bahr	0.65 s	F#	2021-02-12 22:14:14
2	Jesper Bengtson	0.73 s	F#	2021-02-12 23:33:12

#	User	Runtime	Language	Date
1	Adam Engsig	0.08 s	Go	2023-05-11 09:22:47
2	Norbert Voelker	0.34 s	Go	2022-10-28 18:24:10
3	Paul Boddington	0.38 s	Go	2016-05-18 03:01:21
4	Krzysztof Gibuła	0.45 s	Go	2021-05-27 22:35:23

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.29 s	Haskell	2025-07-29 10:12:47
2	Hidden user	0.34 s	Haskell	2022-01-27 02:21:10
3	Dan Greco	0.49 s	Haskell	2025-09-13 18:23:12
4	Vasiliy Kevroletin	0.57 s	Haskell	2018-05-24 11:10:25
5	Zach Tschetter	0.81 s	Haskell	2021-04-17 14:40:29

#	User	Runtime	Language	Date
1	Clement Oh	0.12 s	Java	2022-08-07 19:40:18
2	Sven Rönnbäck	0.12 s	Java	2023-10-04 21:04:12
3	Hà Minh Ngọc	0.20 s	Java	2016-08-10 05:18:12
4	Darko Aleksic	0.24 s	Java	2020-03-21 04:56:31
5	Marcus Johansson	0.25 s	Java	2016-09-07 18:19:45
6	Marcus Danielsson	0.26 s	Java	2016-09-07 16:20:25
7	Joachim Borup	0.26 s	Java	2021-02-22 20:03:42
8	Asmus Tørsleff	0.26 s	Java	2022-01-16 23:20:40
9	Marco Vincenzo Karaan	0.27 s	Java	2015-11-04 03:20:45
10	William Fiset	0.28 s	Java	2016-11-04 16:16:53

#	User	Runtime	Language	Date
1	Christopher Walther	0.55 s	JavaScript (Node.js)	2021-04-16 16:35:22
2	Robin	0.57 s	JavaScript (Node.js)	2020-10-13 10:31:47

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.31 s	JavaScript (SpiderMonkey)	2016-12-21 01:30:40
2	Christian Pilegaard Cederquist	0.36 s	JavaScript (SpiderMonkey)	2023-06-09 06:18:49
3	Zach Tschetter	0.46 s	JavaScript (SpiderMonkey)	2024-11-20 19:37:47

#	User	Runtime	Language	Date
1	Björn Holm	0.45 s	Kotlin	2019-04-29 18:23:27
2	Chelsea Hoernemann	0.50 s	Kotlin	2022-11-16 22:02:23
3	Hidden user	0.57 s	Kotlin	2020-04-14 19:18:33
4	Ali M. Nekoh	0.72 s	Kotlin	2025-06-25 04:27:49
5	Jacob Huebner	0.75 s	Kotlin	2021-05-11 03:08:42
6	Adam Rankin	0.76 s	Kotlin	2023-09-09 16:21:37
7	Garrison Hatcher	0.82 s	Kotlin	2019-11-11 18:08:42
8	Chris Johnson	0.93 s	Kotlin	2025-04-05 04:21:49
9	Phường Lên	0.94 s	Kotlin	2020-05-30 06:49:34

#	User	Runtime	Language	Date
1	Peter Hairatidis	0.11 s	Lua	2025-09-23 21:10:47

#	User	Runtime	Language	Date
1	crapcode	0.28 s	PHP	2022-06-21 22:19:25

#	User	Runtime	Language	Date
1	Edgardo Deza	0.15 s	Python 2	2015-08-31 01:59:06
2	Sergey Pashkovsky	0.17 s	Python 2	2017-11-24 17:43:33
3	Thomas Feld	0.17 s	Python 2	2020-06-23 11:59:30
4	Yan Kalchevsky	0.18 s	Python 2	2017-02-11 20:56:56
5	Christofer Ohlsson	0.20 s	Python 2	2015-05-18 18:40:22
6	Przemysław Curzytek	0.20 s	Python 2	2017-03-08 00:33:34
7	Tal Melamed	0.20 s	Python 2	2017-09-15 02:14:12
8	Max Holmberg	0.21 s	Python 2	2018-11-11 15:48:22
9	So Kimsu	0.24 s	Python 2	2015-07-07 16:29:39
10	Agis Daniels	0.25 s	Python 2	2021-12-12 12:44:29

#	User	Runtime	Language	Date
1	Donald Heppner	0.15 s	Python 3	2017-03-08 04:48:45
2	Cameron Jeffery	0.16 s	Python 3	2025-09-18 15:29:54
3	Jim Deverick	0.17 s	Python 3	2025-09-23 17:52:54
4	Zaid Witwit	0.17 s	Python 3	2025-09-23 21:21:26
5	Hidden user	0.18 s	Python 3	2019-11-01 14:56:59
6	Hidden user	0.18 s	Python 3	2019-11-14 11:05:54
7	Hector Arranz	0.18 s	Python 3	2019-12-27 21:37:04
8	Jiaming Kong	0.18 s	Python 3	2025-08-07 06:07:22
9	aglaé	0.18 s	Python 3	2025-09-23 21:36:06
10	Ronaldo Lopez-Mendez	0.18 s	Python 3	2025-09-23 21:40:27

#	User	Runtime	Language	Date
1	Macdara mac an tSionnaigh	0.25 s	Ruby	2019-10-31 01:17:17
2	Alexandre Arruda	0.26 s	Ruby	2021-11-22 22:54:08
3	Hidden user	0.28 s	Ruby	2019-02-25 15:23:47
4	Thomas Feld	0.55 s	Ruby	2023-08-17 08:28:25

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.01 s	Rust	2024-01-31 13:53:36
2	Rasmus Andersson	0.02 s	Rust	2024-02-05 22:57:01
3	Joe Blower	0.02 s	Rust	2025-08-23 00:18:08
4	Connor Skees	0.03 s	Rust	2020-10-24 18:02:50
5	Pahlevi Fikri Auliya	0.03 s	Rust	2020-11-08 23:50:06
6	Jens Larsen	0.03 s	Rust	2021-09-14 20:24:17
7	Christoffer Andersson	0.03 s	Rust	2024-02-03 21:00:39
8	Mario Rodriguez	0.04 s	Rust	2020-01-19 14:34:39
9	Jonas Ulsnes Jørgensen	0.04 s	Rust	2022-01-29 12:07:55
10	Egor Kulikov	0.05 s	Rust	2024-11-14 14:43:28

#	User	Length	Language	Date
1	Hidden user	1239	C	2017-05-01 04:35:29
2	Maksim Bober	1317	C	2016-09-30 22:01:52
3	Sabit Zahin	1371	C	2015-10-20 18:26:12
4	Mirel Cosulschi	1888	C	2022-11-14 11:43:37
5	pengin	2501	C	2022-03-22 10:56:16
6	Hidden user	4751	C	2016-05-14 01:10:49
7	Hidden user	5040	C	2017-05-01 07:09:21
8	Oscar Cusin	8510	C	2024-02-01 09:25:44
9	Hidden user	76220	C	2024-02-14 22:08:34
10	Hidden user	77491	C	2024-02-21 09:01:51

#	User	Length	Language	Date
1	traxex	1208	C#	2024-05-06 17:09:14
2	German A.	1643	C#	2025-06-21 01:14:26
3	Nicolai	1861	C#	2025-11-18 23:24:11
4	Frankie Chen	2301	C#	2019-07-30 16:20:57
5	Jayant Notani	2414	C#	2020-03-27 21:21:21
6	Robbe Decraemer	2432	C#	2020-04-16 17:39:11
7	Андрей Титов	3108	C#	2015-12-29 08:07:42
8	Ben-Richard Ebbesvik	4791	C#	2024-01-04 23:37:22
9	Anders Petersen	5139	C#	2022-09-14 08:44:45
10	Wojciech Borowiecki	5586	C#	2017-03-07 03:40:50

#	User	Length	Language	Date
1	Elias Lolck	607	C++	2021-02-12 15:48:23
2	Markus Mathiasen	616	C++	2021-11-04 18:55:18
3	Zane Yu	634	C++	2019-01-23 13:50:45
4	Valeriu Motroi	672	C++	2016-04-28 16:09:51
5	Brandon Zhang	692	C++	2019-05-03 19:50:27
6	Lim An Jun	693	C++	2023-02-12 04:42:55
7	Nikola Stojkovski	697	C++	2024-06-13 14:35:46
8	Thiên Tài Zero	719	C++	2016-11-24 14:06:46
9	Ásmundur Óskar Ásmundsson	721	C++	2019-02-11 13:05:33
10	Gabriel Pereira de Carvalho	732	C++	2019-05-25 17:59:48

#	User	Length	Language	Date
1	Jesper Bengtson	2912	F#	2021-02-12 23:42:21
2	Patrick Bahr	3030	F#	2021-02-12 22:14:14

#	User	Length	Language	Date
1	Paul Boddington	1193	Go	2016-05-18 03:01:21
2	Krzysztof Gibuła	1401	Go	2021-05-27 22:35:23
3	Norbert Voelker	1779	Go	2022-10-28 18:24:10
4	Adam Engsig	3885	Go	2021-04-20 22:12:37

#	User	Length	Language	Date
1	Dan Greco	1418	Haskell	2025-09-13 18:19:02
2	Zach Tschetter	1691	Haskell	2021-04-17 14:40:29
3	Steinar Simonnes	2449	Haskell	2025-07-29 10:13:36
4	Hidden user	2860	Haskell	2022-01-27 02:21:34
5	Vasiliy Kevroletin	4333	Haskell	2018-05-24 11:10:25

#	User	Length	Language	Date
1	Yeung Man Tsung	1058	Java	2022-07-26 15:02:38
2	Troels Bjerre Lund	1089	Java	2021-09-10 12:47:12
3	Kurtis Van Gent	1138	Java	2016-04-05 20:01:26
4	Sujay Vadlakonda	1206	Java	2021-09-11 00:40:06
5	Nathan Leake	1304	Java	2017-02-10 22:24:36
6	Corentin Simon	1346	Java	2016-05-05 09:24:55
7	Jeremy Lim	1346	Java	2023-12-23 10:18:14
8	Peppzerr BD	1370	Java	2023-04-08 05:29:10
9	Josenildo Silva	1373	Java	2017-05-12 20:03:07
10	Sebastian Secelean	1374	Java	2016-10-01 19:43:47

#	User	Length	Language	Date
1	Robin	1076	JavaScript (Node.js)	2020-10-13 10:31:47
2	Christopher Walther	3139	JavaScript (Node.js)	2021-04-16 16:35:22

#	User	Length	Language	Date
1	Zach Tschetter	903	JavaScript (SpiderMonkey)	2024-11-20 19:37:47
2	Christian Pilegaard Cederquist	977	JavaScript (SpiderMonkey)	2023-06-09 06:17:08
3	Bjørn Chr. Soltvedt	5982	JavaScript (SpiderMonkey)	2016-12-21 01:30:40

#	User	Length	Language	Date
1	Adam Rankin	1310	Kotlin	2023-09-09 16:21:37
2	Ali M. Nekoh	1553	Kotlin	2025-06-25 04:27:49
3	Chris Johnson	1680	Kotlin	2025-04-05 04:21:49
4	Garrison Hatcher	1786	Kotlin	2019-11-11 18:08:42
5	Phường Lên	1910	Kotlin	2020-05-30 06:49:34
6	Jacob Huebner	2230	Kotlin	2021-05-11 03:08:42
7	Hidden user	2336	Kotlin	2020-04-14 19:18:33
8	Björn Holm	2838	Kotlin	2019-04-29 18:23:27
9	Chelsea Hoernemann	3119	Kotlin	2022-11-16 22:02:23

#	User	Length	Language	Date
1	Peter Hairatidis	1453	Lua	2025-09-23 21:10:47

#	User	Length	Language	Date
1	crapcode	672	PHP	2022-06-21 21:38:07

#	User	Length	Language	Date
1	Thomas Feld	470	Python 2	2020-06-23 11:59:30
2	Andreas Björklund	549	Python 2	2019-05-08 18:03:21
3	Nathan Villanueva	565	Python 2	2017-02-10 23:38:17
4	Vinit Udasi	623	Python 2	2022-11-03 20:18:37
5	Anthony Sistilli	641	Python 2	2017-06-18 05:21:15
6	Alfredo Beaumont	645	Python 2	2018-02-24 23:04:47
7	Kevin Tang	691	Python 2	2019-03-15 00:50:08
8	Thore Husfeldt	707	Python 2	2018-11-17 08:19:26
9	Frederik Højholt	740	Python 2	2016-09-04 19:49:32
10	Ida Bredal Skjørten	769	Python 2	2016-11-09 23:24:13

#	User	Length	Language	Date
1	Thibault Raffaillac	205	Python 3	2023-08-15 20:13:03
2	Guillaume SCHMITT	305	Python 3	2023-08-15 14:23:31
3	Kelly Dance	324	Python 3	2022-10-21 03:47:21
4	benoit belasco	348	Python 3	2023-08-15 13:21:53
5	Henri Lemoine	427	Python 3	2022-09-10 04:03:10
6	Zac Friggstad	440	Python 3	2020-02-14 14:10:26
7	Reshab Chhabra	485	Python 3	2018-01-16 00:42:24
8	Jason Cannon	508	Python 3	2020-11-27 21:24:33
9	Oskar Haarklou Veileborg	524	Python 3	2021-02-12 15:16:35
10	Vedant Vyas	542	Python 3	2020-12-11 21:48:55

#	User	Length	Language	Date
1	Thomas Feld	145	Ruby	2023-08-17 08:33:20
2	Hidden user	675	Ruby	2019-02-25 15:23:47
3	Macdara mac an tSionnaigh	958	Ruby	2019-10-31 01:17:17
4	Alexandre Arruda	1472	Ruby	2021-11-22 22:54:08

#	User	Length	Language	Date
1	Chaoyi Yin	1803	Rust	2019-01-23 01:10:06
2	Chen Weikang	2058	Rust	2019-01-19 22:21:38
3	Rasmus Andersson	2147	Rust	2024-02-05 22:57:01
4	Oskar Nehlin	2314	Rust	2018-11-05 18:48:42
5	Mario Rodriguez	2387	Rust	2020-01-19 14:54:56
6	Louis Bouchard	2435	Rust	2024-09-18 03:00:00
7	Eric Pinter	2617	Rust	2021-11-27 23:44:13
8	Kévin Tollemer	2786	Rust	2025-10-03 13:12:24
9	Hidden user	2880	Rust	2025-10-03 13:40:03
10	Jonas Ulsnes Jørgensen	2909	Rust	2022-01-29 12:07:55

Solution running time distribution