Problem A
Watchdog — Problem Statistics

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Submissions	1737
Accepted submissions	880
Submission ratio	50.66%
Authors	767
Full solves [?]	690
Full solve Ratio	89.96%

#	User	Runtime	Language	Date
1	Ivan Petrov	0.00 s	C	2019-07-04 13:31:16
2	Sambit Palit	0.00 s	C	2020-09-04 23:32:26
3	cikog54399@bboygarage.com	0.00 s	C	2020-12-03 09:05:52
4	Nelson Dan	0.00 s	C	2021-12-05 12:00:27
5	Marcus Forssell Stahre	0.01 s	C	2005-09-22 07:43:21
6	Martin Jackson	0.01 s	C	2017-05-13 23:30:12
7	PhilCampbell	0.01 s	C	2021-02-15 14:51:47
8	Saraswathi (Kunju) Menon	0.01 s	C	2025-01-22 04:33:57
9	Jonatan Nougbele	0.02 s	C	2017-05-17 09:20:55
10	Stevenson	0.02 s	C	2024-11-29 18:48:39

#	User	Runtime	Language	Date
1	Hidden user	0.03 s	C#	2019-04-20 18:38:55
2	Thomas Norris	0.03 s	C#	2020-11-17 16:11:34
3	Robert Warnestam	0.03 s	C#	2021-03-26 21:00:57
4	Marcus Elg	0.04 s	C#	2020-11-12 14:31:26
5	Oskar Smedenmark	0.04 s	C#	2022-07-26 14:59:47
6	Mikael Fiala-Lundström	0.07 s	C#	2022-02-08 17:27:31
7	Göran Andersson	0.09 s	C#	2022-05-20 10:55:39
8	Hidden user	0.18 s	C#	2020-09-11 16:58:07
9	Björn Rundquist	0.29 s	C#	2022-10-05 14:31:29
10	Adam Imbert	0.34 s	C#	2020-12-15 01:58:21

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.26 s	F#	2022-12-23 08:58:52

#	User	Runtime	Language	Date
1	Norbert Voelker	0.02 s	Go	2021-05-08 18:03:16
2	Ian Howell	0.14 s	Go	2021-02-05 20:22:09

#	User	Runtime	Language	Date
1	Gaston Gilbert	0.02 s	Haskell	2020-10-27 18:19:11
2	Hidden user	0.03 s	Haskell	2023-01-22 00:04:52
3	Brent Yorgey	0.04 s	Haskell	2018-06-09 19:58:55
4	Jan Hrček	0.04 s	Haskell	2021-03-16 17:09:04
5	Hidden user	0.07 s	Haskell	2019-09-23 09:15:48
6	Steinar Simonnes	0.07 s	Haskell	2024-02-12 12:28:41
7	Noel Kwan	0.11 s	Haskell	2020-06-09 15:02:10
8	Erik von Brömssen	0.13 s	Haskell	2021-06-19 13:09:07
9	Flocon de Son	0.14 s	Haskell	2020-06-12 06:38:05
10	Chan Ken	0.16 s	Haskell	2021-08-17 15:12:07

#	User	Runtime	Language	Date
1	William Fiset	0.07 s	Java	2017-02-17 15:04:05
2	Sven Rönnbäck	0.07 s	Java	2023-03-25 15:27:50
3	Martijn Muijsers	0.08 s	Java	2017-03-01 20:07:13
4	Hans Gylling	0.09 s	Java	2010-05-29 07:26:21
5	Steven Cheng	0.09 s	Java	2018-05-22 13:35:50
6	Stela Palii	0.11 s	Java	2018-01-12 10:52:24
7	Luke Eales	0.13 s	Java	2023-12-04 12:29:06
8	Andreas Jansson	0.15 s	Java	2021-01-18 18:46:52
9	Aaron Zhou	0.15 s	Java	2023-04-07 16:36:41
10	Kadin Tang	0.16 s	Java	2020-12-23 04:16:15

#	User	Runtime	Language	Date
1	Peter Kedemo	0.47 s	JavaScript (Node.js)	2020-01-02 09:38:41
2	Ismail Tahiri	0.54 s	JavaScript (Node.js)	2020-07-12 21:49:51
3	Oscar Peulicke	0.59 s	JavaScript (Node.js)	2020-10-23 14:44:25
4	Andoko Chandra	0.62 s	JavaScript (Node.js)	2020-10-21 03:05:05
5	Marc Fong	0.76 s	JavaScript (Node.js)	2021-05-06 16:58:25
6	Samuel Högfeldt	0.76 s	JavaScript (Node.js)	2022-07-18 14:16:44
7	Bas Dirks	0.88 s	JavaScript (Node.js)	2021-12-21 17:55:48

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.05 s	JavaScript (SpiderMonkey)	2023-02-08 19:59:00
2	Peter Menyes	0.09 s	JavaScript (SpiderMonkey)	2021-10-13 17:21:14
3	Bjørn Chr. Soltvedt	0.14 s	JavaScript (SpiderMonkey)	2017-02-09 01:26:41
4	Andri Andresson	0.14 s	JavaScript (SpiderMonkey)	2018-04-25 16:49:12
5	Zach Tschetter	0.23 s	JavaScript (SpiderMonkey)	2025-07-26 00:37:06

#	User	Runtime	Language	Date
1	Timothy Gaede	0.72 s	Julia	2024-04-17 04:45:17

#	User	Runtime	Language	Date
1	Mike Wilkes	0.29 s	Kotlin	2018-02-22 03:19:39
2	Colin Gay	0.34 s	Kotlin	2019-05-24 05:01:41
3	Suyash Sinha	0.38 s	Kotlin	2023-09-19 10:49:43
4	Adam Rankin	0.44 s	Kotlin	2023-08-25 23:22:56
5	Neil Harmon	0.55 s	Kotlin	2019-05-14 08:59:59
6	Hidden user	0.66 s	Kotlin	2022-07-22 16:00:46

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.03 s	Pascal	2018-08-17 18:45:18

#	User	Runtime	Language	Date
1	Brynjar Sigurðsson	0.08 s	Python 2	2018-04-24 14:05:01
2	Jesper Öqvist	0.08 s	Python 2	2018-10-27 16:05:02
3	Bjarki Ágúst Guðmundsson	0.09 s	Python 2	2018-04-24 14:00:20
4	Thomas Feld	0.09 s	Python 2	2019-10-24 13:45:49
5	Samuel Holmin	0.11 s	Python 2	2019-05-11 21:16:55
6	Yanmarshus Bachtiar	0.11 s	Python 2	2020-10-27 01:49:36
7	Ismail Tigrek	0.12 s	Python 2	2017-11-11 19:54:49
8	Lars Åström	0.12 s	Python 2	2019-10-18 13:59:48
9	Isaac Lee	0.15 s	Python 2	2019-12-15 20:57:51
10	Andreas Björklund	0.21 s	Python 2	2019-03-08 15:50:31

#	User	Runtime	Language	Date
1	Björn Gunnarsson	0.05 s	Python 3	2018-04-26 10:50:08
2	Ryan Tan	0.07 s	Python 3	2025-07-22 15:51:08
3	Dominic Berzin Chua Way Gin	0.08 s	Python 3	2025-04-17 09:49:54
4	Carter Bridges	0.08 s	Python 3	2025-05-06 18:33:55
5	Jose Mauricio Nuñez Valencia	0.08 s	Python 3	2025-10-24 18:20:11
6	Santiago López Tajonar	0.08 s	Python 3	2025-11-12 03:54:00
7	Collin Simpson	0.08 s	Python 3	2025-12-14 21:22:13
8	Vincent Tandya	0.09 s	Python 3	2019-02-26 05:04:36
9	Christian Lebeda	0.09 s	Python 3	2020-07-13 07:03:43
10	Martin Fesser	0.09 s	Python 3	2020-08-13 10:39:27

#	User	Runtime	Language	Date
1	Christofer Nolander	0.00 s	Rust	2019-02-01 16:31:43
2	Alex G	0.00 s	Rust	2020-03-13 00:37:11
3	Morris Hansing	0.00 s	Rust	2021-02-10 13:05:57
4	Morten Lohne	0.00 s	Rust	2021-08-17 18:40:45
5	Daniel Anker Hermansen	0.00 s	Rust	2022-12-29 21:55:11
6	Robert Janczewski	0.01 s	Rust	2020-02-07 22:32:51
7	Joacim Norlén	0.01 s	Rust	2021-04-22 07:31:25
8	Giang Đào	0.01 s	Rust	2023-01-08 14:14:16
9	Eskil Queseth	0.05 s	Rust	2020-02-08 16:47:04

#	User	Runtime	Language	Date
1	Anton J Olsson	0.19 s	TypeScript	2023-08-05 16:50:31

#	User	Length	Language	Date
1	Ivan Petrov	660	C	2019-07-04 13:31:16
2	cikog54399@bboygarage.com	1028	C	2020-12-03 09:05:52
3	Nelson Dan	1099	C	2021-12-05 12:00:27
4	Max McGinty	1543	C	2025-05-06 20:34:25
5	Martin Jackson	1669	C	2017-05-13 23:30:12
6	Marcus Forssell Stahre	1705	C	2005-09-22 07:43:21
7	Sambit Palit	1868	C	2020-09-04 23:32:26
8	Saraswathi (Kunju) Menon	1879	C	2025-01-22 04:33:57
9	PhilCampbell	1993	C	2021-02-15 14:51:47
10	Jonatan Nougbele	2183	C	2017-05-17 09:20:55

#	User	Length	Language	Date
1	Thomas Norris	1437	C#	2020-11-17 16:11:34
2	Göran Andersson	1605	C#	2022-05-20 10:55:39
3	Hidden user	2682	C#	2020-09-11 16:58:07
4	Zack Latta	2702	C#	2025-05-03 19:24:33
5	Björn Rundquist	2810	C#	2022-10-05 14:31:29
6	Marcus Elg	2814	C#	2020-11-12 14:31:26
7	Adam Imbert	3012	C#	2020-12-15 01:58:21
8	Oskar Smedenmark	3755	C#	2022-07-26 14:59:47
9	Csaba Varga	4809	C#	2020-06-06 19:31:53
10	Hidden user	4822	C#	2019-04-20 18:38:55

#	User	Length	Language	Date
1	Hidden user	536	C++	2020-01-27 20:43:25
2	Johan Wind	622	C++	2018-05-05 16:41:24
3	Frederick Pek	639	C++	2021-06-15 07:10:51
4	Armen Andreasyan	651	C++	2017-06-11 11:42:36
5	Josenildo Silva	697	C++	2018-08-04 13:48:03
6	Đoàn Công Chính	711	C++	2018-12-22 05:04:01
7	Bbshsh Si	734	C++	2021-04-22 16:56:42
8	Grae Yeandle	738	C++	2017-02-25 15:55:36
9	Josh Howell	760	C++	2021-02-23 18:37:11
10	Jason Zhao	773	C++	2024-10-10 03:36:55

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1432	F#	2022-12-23 08:58:52

#	User	Length	Language	Date
1	Ian Howell	1229	Go	2021-02-05 20:22:09
2	Norbert Voelker	1804	Go	2021-05-08 18:06:13

#	User	Length	Language	Date
1	Hidden user	879	Haskell	2023-01-22 00:04:52
2	Steinar Simonnes	1159	Haskell	2024-02-12 12:28:16
3	Erik von Brömssen	1553	Haskell	2021-06-19 13:09:07
4	Flocon de Son	1835	Haskell	2020-06-12 06:38:05
5	Joshua Zygmunt	1840	Haskell	2020-12-26 16:21:43
6	Jan Hrček	1999	Haskell	2021-03-16 17:09:04
7	Brent Yorgey	2205	Haskell	2018-06-09 19:58:55
8	Chan Ken	2246	Haskell	2021-08-17 15:12:07
9	Noel Kwan	2899	Haskell	2020-06-09 15:02:10
10	Hidden user	6293	Haskell	2019-09-23 09:15:48

#	User	Length	Language	Date
1	Doug Goodman	834	Java	2018-06-12 21:16:13
2	Evan Michael Bailey	917	Java	2022-06-04 05:51:49
3	Caeden Whitaker	1005	Java	2020-07-23 05:13:16
4	Eric Leow Yu Quan	1134	Java	2021-01-11 07:45:43
5	Andreas Jansson	1223	Java	2021-01-18 18:46:52
6	Micah Stairs	1247	Java	2017-04-05 01:27:47
7	Ben Blodgett	1340	Java	2024-08-31 18:09:21
8	Morten Blørstad	1351	Java	2021-02-14 10:43:59
9	Crystal Sharpe	1393	Java	2020-03-31 03:17:22
10	Sam Farrell	1426	Java	2021-05-24 06:54:49

#	User	Length	Language	Date
1	Oscar Peulicke	952	JavaScript (Node.js)	2020-10-23 14:44:25
2	Peter Kedemo	1380	JavaScript (Node.js)	2020-01-02 09:38:41
3	Ismail Tahiri	1516	JavaScript (Node.js)	2020-07-12 21:49:51
4	Samuel Högfeldt	1816	JavaScript (Node.js)	2022-07-18 14:16:44
5	Bas Dirks	2104	JavaScript (Node.js)	2021-12-21 17:55:48
6	Marc Fong	2106	JavaScript (Node.js)	2021-05-06 16:59:41
7	Andoko Chandra	2237	JavaScript (Node.js)	2020-10-21 03:05:05

#	User	Length	Language	Date
1	Peter Menyes	692	JavaScript (SpiderMonkey)	2021-10-13 18:19:48
2	Christian Pilegaard Cederquist	824	JavaScript (SpiderMonkey)	2023-02-08 19:59:00
3	Bjørn Chr. Soltvedt	1039	JavaScript (SpiderMonkey)	2017-02-09 01:26:41
4	Zach Tschetter	1698	JavaScript (SpiderMonkey)	2025-07-26 00:37:06
5	Andri Andresson	1721	JavaScript (SpiderMonkey)	2018-04-25 16:49:12

#	User	Length	Language	Date
1	Timothy Gaede	1976	Julia	2024-04-17 04:45:17

#	User	Length	Language	Date
1	Colin Gay	928	Kotlin	2019-05-24 05:01:41
2	Adam Rankin	1150	Kotlin	2023-08-25 23:22:56
3	Suyash Sinha	1424	Kotlin	2023-09-19 10:49:43
4	Hidden user	1954	Kotlin	2022-07-22 16:00:46
5	Mike Wilkes	2119	Kotlin	2018-02-22 03:19:39
6	Neil Harmon	2510	Kotlin	2019-05-14 08:59:59

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1349	Pascal	2018-08-17 18:45:18

#	User	Length	Language	Date
1	Thomas Feld	387	Python 2	2019-10-24 13:45:49
2	Lars Åström	557	Python 2	2019-10-18 13:59:48
3	Andreas Björklund	677	Python 2	2019-03-08 15:50:31
4	Jesper Öqvist	728	Python 2	2018-10-27 16:05:02
5	Samuel Holmin	741	Python 2	2019-05-11 21:16:55
6	Jonatan Nilsson	760	Python 2	2018-07-01 08:00:01
7	Henrik Adolfsson	803	Python 2	2017-05-14 08:24:39
8	Yanmarshus Bachtiar	846	Python 2	2020-10-27 01:49:36
9	Johan Lyts	856	Python 2	2020-06-23 19:17:10
10	Isaac Lee	895	Python 2	2019-12-15 20:57:51

#	User	Length	Language	Date
1	Benjamin Z White	272	Python 3	2023-05-26 19:55:11
2	Charles Ancheta	298	Python 3	2023-04-18 20:57:20
3	Ahmed Chamseddine	332	Python 3	2024-08-22 14:55:15
4	Jayden Pahukula	334	Python 3	2023-10-18 23:31:35
5	Yong Mao	346	Python 3	2023-10-02 22:33:14
6	Thibault Raffaillac	347	Python 3	2024-08-05 16:54:08
7	Artur Khuziakhmetov	419	Python 3	2025-02-12 08:46:03
8	Timothy Baeckelant	445	Python 3	2024-01-22 22:02:24
9	Vedran Čačić	447	Python 3	2019-03-27 19:52:35
10	M Base 2	447	Python 3	2021-05-28 18:52:13

#	User	Length	Language	Date
1	Morris Hansing	1621	Rust	2021-02-10 13:05:57
2	Morten Lohne	1652	Rust	2021-08-17 18:40:45
3	Robert Janczewski	2126	Rust	2020-02-07 22:32:51
4	Joacim Norlén	2213	Rust	2021-04-22 07:31:25
5	Eskil Queseth	2472	Rust	2020-02-08 16:47:04
6	Christofer Nolander	3296	Rust	2019-02-01 16:31:43
7	Alex G	3347	Rust	2020-03-13 00:37:11
8	Giang Đào	7866	Rust	2023-01-08 14:14:16
9	Daniel Anker Hermansen	23294	Rust	2022-12-29 21:55:11

#	User	Length	Language	Date
1	Anton J Olsson	2990	TypeScript	2023-08-05 16:50:31

Solution running time distribution