Problem I
Janitor Troubles — Problem Statistics

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Submissions	4716
Accepted submissions	3114
Submission ratio	66.03%
Authors	3030
Full solves [?]	2912
Full solve Ratio	96.11%

#	User	Runtime	Language	Date
1	Thomas Feld	0.01 s	APL	2023-04-27 09:59:45

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.06 s	Bash	2023-10-27 08:22:42

#	User	Runtime	Language	Date
1	Eric Bäckhage	0.02 s	C#	2019-02-17 10:11:22
2	DE	0.02 s	C#	2019-02-26 23:08:06
3	Niklas Huss	0.02 s	C#	2019-02-27 10:38:23
4	Fredrik Stigsson	0.02 s	C#	2019-06-05 14:06:15
5	Risto Kaunisto	0.02 s	C#	2019-07-26 11:43:47
6	Henrik Hallbert	0.02 s	C#	2019-08-28 22:24:17
7	Juuso Liljavirta	0.02 s	C#	2019-09-17 22:14:16
8	Christian Zhuang-Qing Nielsen	0.02 s	C#	2019-09-19 10:19:22
9	Thomas Norris	0.02 s	C#	2019-09-26 20:47:15
10	Thomas Koot	0.02 s	C#	2019-10-01 12:44:45

#	User	Runtime	Language	Date
1	David Cawthon	0.01 s	Common Lisp	2019-08-09 02:00:12
2	Ralf Jonas	0.01 s	Common Lisp	2023-09-08 10:50:51
3	Hidden user	0.02 s	Common Lisp	2019-05-25 09:10:24

#	User	Runtime	Language	Date
1	Patrick Bahr	0.04 s	F#	2021-02-20 18:52:53
2	Jacob Harris Cryer Kragh	0.04 s	F#	2022-05-28 12:24:19
3	oskar holland	0.08 s	F#	2023-09-21 13:03:09

#	User	Runtime	Language	Date
1	David Vinje	0.02 s	Go	2022-08-01 11:46:38
2	Jimmy Nejtron	0.02 s	Go	2022-12-04 18:33:13
3	Markus Weller	0.07 s	Go	2019-04-02 22:14:50
4	Neal McCarthy	0.07 s	Go	2019-04-09 22:21:48
5	Jonathan Rintala	0.07 s	Go	2019-07-28 11:51:22
6	Andreas Gottschalk Krath	0.07 s	Go	2022-04-10 23:31:46
7	Miguel Martinez	0.08 s	Go	2019-07-04 16:26:34
8	Norbert Voelker	0.08 s	Go	2021-04-09 23:09:44
9	Krzysztof Gibuła	0.08 s	Go	2021-05-21 20:41:31
10	Kok Dith	0.08 s	Go	2021-07-30 17:29:30

#	User	Runtime	Language	Date
1	Brian Hwang	0.00 s	Haskell	2022-09-04 03:02:18
2	Daniel Gunleiksrud	0.00 s	Haskell	2022-11-16 11:25:49
3	Mansur Ziiatdinov	0.00 s	Haskell	2023-01-09 18:16:20
4	Sebastian Banert	0.00 s	Haskell	2023-04-19 21:51:46
5	Greg Rosser	0.00 s	Haskell	2023-07-19 22:21:10
6	Steinar Simonnes	0.00 s	Haskell	2024-01-15 08:42:47
7	Brent Yorgey	0.01 s	Haskell	2018-12-24 03:21:17
8	Lim Ming Yean	0.01 s	Haskell	2019-03-02 15:29:11
9	Dan Kattis Mulick	0.01 s	Haskell	2019-03-25 16:52:55
10	Marcus Zimmermann	0.01 s	Haskell	2019-05-12 22:43:48

#	User	Runtime	Language	Date
1	Taras Romanyuk	0.04 s	Java	2025-01-29 21:02:34
2	Lee Heng Sheng	0.05 s	Java	2024-04-17 04:57:14
3	Ku Brian	0.05 s	Java	2024-04-29 06:28:29
4	Markus Bao	0.05 s	Java	2025-07-24 05:52:06
5	Lim Zhan Hong	0.06 s	Java	2020-05-04 10:37:57
6	Ryan Lee Ting Zhern	0.06 s	Java	2020-05-18 15:59:23
7	Mathias Hvid	0.06 s	Java	2020-06-19 19:08:38
8	Travis Dula	0.06 s	Java	2020-07-19 19:55:44
9	Jacob O'Shaughnessy	0.06 s	Java	2020-11-21 22:48:42
10	Javier Jose Marin Salazar	0.06 s	Java	2021-04-02 10:56:30

#	User	Runtime	Language	Date
1	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-02-27 02:00:49
2	console.log	0.05 s	JavaScript (Node.js)	2019-03-08 21:08:55
3	Naresh Murthy	0.05 s	JavaScript (Node.js)	2019-04-11 17:11:57
4	Hidden user	0.05 s	JavaScript (Node.js)	2024-11-27 14:43:38
5	Casper Lundberg	0.09 s	JavaScript (Node.js)	2022-09-14 20:26:57
6	Martin Chemander	0.09 s	JavaScript (Node.js)	2022-11-26 11:59:19
7	Marko Doroch	0.09 s	JavaScript (Node.js)	2022-12-10 23:53:31
8	August Danell Håkansson	0.09 s	JavaScript (Node.js)	2023-05-28 14:40:29
9	Nick Ivanov	0.41 s	JavaScript (Node.js)	2020-03-08 17:42:03
10	Rick van Rheenen	0.42 s	JavaScript (Node.js)	2020-03-25 10:58:43

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2018-12-31 02:14:16
2	Peter Menyes	0.02 s	JavaScript (SpiderMonkey)	2021-02-04 09:28:40
3	Nicklas Utgaard	0.02 s	JavaScript (SpiderMonkey)	2021-04-17 17:53:46
4	Gerald Go	0.02 s	JavaScript (SpiderMonkey)	2021-10-19 18:35:23
5	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2022-08-16 10:08:03
6	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2022-10-30 19:17:10
7	Zach Tschetter	0.02 s	JavaScript (SpiderMonkey)	2023-04-19 18:42:15
8	Evan Magill	0.02 s	JavaScript (SpiderMonkey)	2024-04-12 20:14:17

#	User	Runtime	Language	Date
1	Timothy Gaede	0.42 s	Julia	2025-04-01 05:28:46

#	User	Runtime	Language	Date
1	Marit van Dijk	0.15 s	Kotlin	2021-09-16 19:49:31
2	Hidden user	0.16 s	Kotlin	2019-12-23 05:37:28
3	arda atci	0.18 s	Kotlin	2020-07-07 17:39:30
4	Dayan Ruben Gonzalez	0.19 s	Kotlin	2020-10-07 21:56:26
5	Sarek Høverstad Skotåm	0.19 s	Kotlin	2020-10-11 13:45:25
6	Albert Pala	0.19 s	Kotlin	2021-05-28 13:38:22
7	Neil Harmon	0.20 s	Kotlin	2019-04-11 13:45:05
8	Nicholas Johnson	0.20 s	Kotlin	2021-04-19 02:27:24
9	Adam Rankin	0.20 s	Kotlin	2023-04-24 21:36:46
10	Zaw Myat	0.20 s	Kotlin	2024-02-04 22:28:02

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.00 s	Lua	2023-11-16 21:51:20

#	User	Runtime	Language	Date
1	Matthew Lutze	0.00 s	OCaml	2020-06-14 08:02:14
2	Fredrik Eriksson	0.00 s	OCaml	2024-10-16 20:58:47

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-04-27 18:09:32

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2019-02-08 16:05:24
2	David Connolly	0.00 s	Pascal	2021-11-23 11:58:20

#	User	Runtime	Language	Date
1	Saito Ta	0.01 s	Perl	2024-04-03 10:06:55

#	User	Runtime	Language	Date
1	Renate	0.01 s	PHP	2021-05-07 09:16:38
2	Andre Wahyudi	0.01 s	PHP	2022-09-20 05:46:33

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.02 s	Prolog	2023-01-27 20:29:34

#	User	Runtime	Language	Date
1	Hasan Kalzi	0.02 s	Python 2	2022-06-18 11:17:02
2	Hermon Mulat	0.03 s	Python 2	2019-01-04 19:15:42
3	Emad Medher	0.03 s	Python 2	2019-01-26 19:09:20
4	Johan Lyts	0.03 s	Python 2	2019-02-17 21:31:58
5	Jesper Öqvist	0.03 s	Python 2	2019-02-25 15:27:03
6	Andrei Stoica	0.03 s	Python 2	2019-03-05 14:40:09
7	Garðar Ingvarsson	0.03 s	Python 2	2019-04-23 17:18:38
8	David Nilsson	0.03 s	Python 2	2019-07-16 16:33:14
9	Thomas Feld	0.03 s	Python 2	2019-08-30 10:15:44
10	Andreas Björklund	0.03 s	Python 2	2019-09-05 19:32:37

#	User	Runtime	Language	Date
1	Steven Halim	0.02 s	Python 3	2018-12-24 05:08:03
2	Christofer Ohlsson	0.02 s	Python 3	2018-12-26 22:06:49
3	Wayne	0.02 s	Python 3	2019-01-05 15:49:03
4	Petra Marc	0.02 s	Python 3	2019-01-13 12:27:54
5	Catalin Popa	0.02 s	Python 3	2019-01-21 15:19:35
6	Mert Cenk Yediparmak	0.02 s	Python 3	2019-01-22 22:46:25
7	Hidden user	0.02 s	Python 3	2019-01-23 01:06:33
8	Alexei Fedotov	0.02 s	Python 3	2019-01-25 12:55:27
9	Denis Benčič	0.02 s	Python 3	2019-01-28 10:51:08
10	Dylan Do Amaral	0.02 s	Python 3	2019-01-31 11:24:28

#	User	Runtime	Language	Date
1	Laurent Voisin	0.04 s	Ruby	2019-07-30 00:32:14
2	Jonathan Ogden	0.05 s	Ruby	2021-05-26 19:40:45
3	Hadi Qovaizi	0.05 s	Ruby	2021-07-16 14:07:46
4	Régis Hanol	0.05 s	Ruby	2022-01-07 11:06:48
5	TobiasZ	0.05 s	Ruby	2022-01-15 10:46:06
6	Thomas Feld	0.06 s	Ruby	2022-11-01 13:13:44
7	dick move	0.06 s	Ruby	2022-11-14 16:54:15
8	Eugen Neagoe	0.06 s	Ruby	2023-04-28 11:15:19
9	Alexander Bilde Pedersen	0.06 s	Ruby	2023-05-05 00:18:31
10	Tausif Ahmed	0.06 s	Ruby	2025-04-07 21:23:54

#	User	Runtime	Language	Date
1	Grettir Heimisson	0.00 s	Zig	2025-10-28 10:48:33

#	User	Length	Language	Date
1	Thomas Feld	29	APL	2023-04-27 10:09:42

#	User	Length	Language	Date
1	Chenzhang Hu	58	Bash	2025-09-13 00:39:37

#	User	Length	Language	Date
1	Sawyer Frie	124	C	2023-04-16 22:47:52
2	Stian Toften	169	C	2021-04-18 19:19:44
3	Alex Nugent	178	C	2022-10-27 21:02:40
4	huy lý	183	C	2022-10-04 08:53:00
5	Sophia Ricarte	192	C	2020-09-25 16:33:41
6	紅茶	198	C	2023-01-24 09:56:49
7	Emil Wihlander	206	C	2020-11-26 22:37:06
8	Ramana Palivelu Bhagya Lakshmi	207	C	2020-12-13 10:20:25
9	Adam Johansson	207	C	2023-01-09 14:32:29
10	Sam Ganji	209	C	2023-02-15 16:43:55

#	User	Length	Language	Date
1	Deci Bel	284	C#	2024-12-31 11:52:20
2	traxex	321	C#	2024-04-19 15:56:51
3	Esty Crow	350	C#	2022-09-30 22:10:04
4	Eric Bäckhage	372	C#	2019-02-17 10:11:22
5	Isaac Wong	429	C#	2021-02-09 06:41:12
6	Michael Palkovics	430	C#	2020-01-23 14:25:53
7	Benjamin Bilbeau	438	C#	2023-09-26 18:23:01
8	Sebastián Rodríguez Brauer	439	C#	2023-10-16 02:44:55
9	Martin Skivenesvåg Johannessen	440	C#	2023-10-17 18:28:28
10	Natalia Álvarez Del Castillo García	455	C#	2023-11-29 05:01:38

#	User	Length	Language	Date
1	Jonas Bang Søgaard	150	C++	2023-02-07 07:06:24
2	Elias Lolck	182	C++	2022-12-28 21:03:34
3	Anh Ngô Nhựt	183	C++	2022-10-04 08:48:37
4	Vuong Cao	185	C++	2022-10-09 08:40:37
5	Zane Yu	186	C++	2019-01-06 04:57:04
6	son le thanh	191	C++	2021-10-18 15:27:59
7	Noah Weninger	192	C++	2018-12-22 19:38:59
8	Francesco La Barbera	192	C++	2022-11-15 22:30:37
9	Kerk Tai Heng	192	C++	2025-05-19 07:10:49
10	Michael Jonathan Halim	194	C++	2019-07-26 08:05:28

#	User	Length	Language	Date
1	Ralf Jonas	169	Common Lisp	2023-09-08 10:50:51
2	Hidden user	262	Common Lisp	2019-05-25 09:10:24
3	David Cawthon	374	Common Lisp	2019-08-09 02:00:12

#	User	Length	Language	Date
1	oskar holland	143	F#	2023-09-21 13:03:09
2	Jacob Harris Cryer Kragh	302	F#	2022-05-28 12:24:19
3	Patrick Bahr	1873	F#	2021-02-20 18:52:53

#	User	Length	Language	Date
1	Andreas Gottschalk Krath	214	Go	2022-04-10 23:31:46
2	David Vinje	236	Go	2022-08-01 11:46:38
3	Kok Dith	253	Go	2021-07-30 17:29:30
4	Hidden user	255	Go	2021-12-17 09:37:09
5	Miguel Martinez	303	Go	2019-07-04 16:26:34
6	Jonathan Rintala	305	Go	2019-07-28 11:52:43
7	Markus Weller	422	Go	2019-04-02 22:14:50
8	Jimmy Nejtron	480	Go	2022-12-04 18:33:13
9	Neal McCarthy	569	Go	2019-04-09 22:21:48
10	Krzysztof Gibuła	659	Go	2021-05-21 20:41:31

#	User	Length	Language	Date
1	Phan Ngọc Tiên	118	Haskell	2022-04-01 20:59:49
2	Tim Put	153	Haskell	2021-11-08 03:02:20
3	Steinar Simonnes	159	Haskell	2024-01-15 08:42:47
4	Scott Dauer	160	Haskell	2022-03-04 04:01:48
5	Freek van Keulen	173	Haskell	2021-02-06 13:59:20
6	Sebastian Banert	176	Haskell	2023-04-19 21:51:46
7	Monique Oliveira	187	Haskell	2021-06-25 08:45:41
8	Daniel Gunleiksrud	201	Haskell	2022-11-16 11:25:49
9	Fulano de Tal	247	Haskell	2022-01-24 18:01:53
10	Jan Hrček	253	Haskell	2020-10-19 15:35:08

#	User	Length	Language	Date
1	Lim Ting Kai	304	Java	2023-06-03 10:12:02
2	Luis Santori	330	Java	2020-03-19 21:47:26
3	Anton Sandin	343	Java	2022-04-20 12:56:20
4	Carter Henderson	344	Java	2021-09-17 17:52:51
5	Syed AbuTalib	345	Java	2019-09-30 23:46:04
6	Nate Alden	345	Java	2020-01-21 01:57:11
7	Shawn Chen	346	Java	2020-03-19 21:44:01
8	Rasmus Streubel Nielsen	348	Java	2024-07-29 19:28:30
9	Florin Cazacu	349	Java	2019-08-23 19:25:15
10	Bivash Pandey	352	Java	2019-05-27 20:12:02

#	User	Length	Language	Date
1	Karim Dridi	221	JavaScript (Node.js)	2022-01-14 16:53:29
2	Gurpartap Singh Bhatti	358	JavaScript (Node.js)	2019-02-27 02:00:49
3	Chris Wong	372	JavaScript (Node.js)	2021-02-01 15:10:16
4	Rick van Rheenen	391	JavaScript (Node.js)	2020-03-25 10:58:43
5	Antoine Bauri	401	JavaScript (Node.js)	2021-02-21 18:15:16
6	Howard Tin Chi Chan	440	JavaScript (Node.js)	2021-02-06 22:17:15
7	Nick Ivanov	449	JavaScript (Node.js)	2020-03-08 17:42:03
8	Ali	463	JavaScript (Node.js)	2021-12-19 09:53:49
9	August Danell Håkansson	475	JavaScript (Node.js)	2023-05-28 14:40:29
10	Hovhannes Kantuni	533	JavaScript (Node.js)	2020-09-03 01:18:49

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	87	JavaScript (SpiderMonkey)	2022-10-30 19:22:11
2	Evan Magill	112	JavaScript (SpiderMonkey)	2024-04-12 20:14:17
3	Jimmy Gustafsson	127	JavaScript (SpiderMonkey)	2022-08-16 10:08:03
4	Peter Menyes	162	JavaScript (SpiderMonkey)	2021-02-04 09:28:40
5	Zach Tschetter	208	JavaScript (SpiderMonkey)	2023-04-19 18:42:15
6	Bjørn Chr. Soltvedt	211	JavaScript (SpiderMonkey)	2018-12-31 02:14:16
7	Gerald Go	350	JavaScript (SpiderMonkey)	2021-10-19 18:35:23
8	Nicklas Utgaard	366	JavaScript (SpiderMonkey)	2021-04-17 17:53:46

#	User	Length	Language	Date
1	Timothy Gaede	257	Julia	2025-04-01 05:28:46

#	User	Length	Language	Date
1	Sarek Høverstad Skotåm	201	Kotlin	2020-10-11 13:45:25
2	Nicholas Johnson	214	Kotlin	2021-04-19 02:27:24
3	Albert Pala	250	Kotlin	2021-05-28 13:38:22
4	Dayan Ruben Gonzalez	302	Kotlin	2020-10-07 21:56:26
5	Troy Warmboe	324	Kotlin	2024-04-06 00:41:35
6	Zaw Myat	454	Kotlin	2024-02-04 22:28:02
7	Hidden user	591	Kotlin	2019-12-23 05:37:28
8	arda atci	599	Kotlin	2020-07-07 17:39:30
9	Neil Harmon	645	Kotlin	2019-04-11 13:45:05
10	Marit van Dijk	688	Kotlin	2021-09-16 19:49:31

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	159	Lua	2023-11-16 21:51:20

#	User	Length	Language	Date
1	Fredrik Eriksson	266	OCaml	2024-10-16 20:58:47
2	Matthew Lutze	353	OCaml	2020-06-14 08:02:14

#	User	Length	Language	Date
1	Hidden user	461	Odin	2025-04-27 18:09:32

#	User	Length	Language	Date
1	David Connolly	249	Pascal	2021-11-23 11:58:20
2	Ingemar Ragnemalm	421	Pascal	2019-02-08 16:05:24

#	User	Length	Language	Date
1	Saito Ta	86	Perl	2024-04-03 10:06:55

#	User	Length	Language	Date
1	Renate	123	PHP	2021-05-07 09:16:38
2	Andre Wahyudi	527	PHP	2022-09-20 05:46:33

#	User	Length	Language	Date
1	Hakan Kjellerstrand	205	Prolog	2023-01-27 20:29:34

#	User	Length	Language	Date
1	Thomas Feld	89	Python 2	2019-08-30 10:15:44
2	Sigurður Jens Albertsson	89	Python 2	2021-02-23 21:45:56
3	John Paul Coronado	106	Python 2	2020-09-27 10:16:37
4	Johan Lyts	126	Python 2	2019-02-17 21:31:58
5	Garðar Ingvarsson	126	Python 2	2019-04-23 17:18:38
6	Shakeel Samsudeen	128	Python 2	2020-06-08 21:11:58
7	David Nilsson	132	Python 2	2019-07-16 16:33:14
8	Jesper Öqvist	134	Python 2	2019-02-25 15:27:03
9	Wesley Stephanak	135	Python 2	2019-09-27 00:01:32
10	Mukerem Ali Nur	148	Python 2	2019-10-02 18:55:52

#	User	Length	Language	Date
1	Lawry Sorenson	75	Python 3	2023-06-07 00:55:31
2	Jonathan Ståhl	82	Python 3	2024-10-15 13:20:51
3	Erik Heimdal	83	Python 3	2022-11-25 17:51:28
4	Benjamin Z White	83	Python 3	2023-04-07 22:59:35
5	Clement Oh	83	Python 3	2023-05-03 19:55:24
6	Josh Henderson	83	Python 3	2023-05-15 21:39:15
7	Guk Yi Siong	83	Python 3	2023-06-13 11:17:37
8	Ahmed Chamseddine	83	Python 3	2023-10-20 19:24:27
9	Isaac Erdman	83	Python 3	2024-02-13 06:58:28
10	Wilmer Ansgariusson	83	Python 3	2024-10-15 13:20:58

#	User	Length	Language	Date
1	Thomas Feld	58	Ruby	2023-01-03 09:06:59
2	dick move	60	Ruby	2022-11-14 16:59:14
3	Alexander Bilde Pedersen	84	Ruby	2023-05-05 00:18:31
4	Régis Hanol	97	Ruby	2022-01-07 11:06:48
5	Jonathan Ogden	137	Ruby	2021-05-26 19:40:45
6	Eugen Neagoe	152	Ruby	2023-04-28 11:15:19
7	Chenzhang Hu	162	Ruby	2025-09-22 15:33:13
8	Tausif Ahmed	272	Ruby	2025-04-07 21:23:54
9	Laurent Voisin	277	Ruby	2019-07-30 00:32:14
10	TobiasZ	288	Ruby	2022-01-15 10:46:06

#	User	Length	Language	Date
1	Artur Khuziakhmetov	301	Rust	2023-07-31 17:44:22
2	Emil Dichmann	353	Rust	2025-09-01 17:20:07
3	Vincent Lagerros	356	Rust	2024-12-09 02:49:19
4	Bas Dirks	384	Rust	2021-12-30 00:29:16
5	Andriy Semenistiy	429	Rust	2021-02-15 15:36:36
6	Pankajkumar Patro	430	Rust	2024-07-14 22:28:45
7	Henry Jayakusuma	440	Rust	2020-05-31 08:09:45
8	Selim Yetkin	458	Rust	2023-08-12 01:08:40
9	Chaoyi Yin	508	Rust	2019-04-01 22:45:44
10	Connor Ford	519	Rust	2024-07-02 16:28:00

#	User	Length	Language	Date
1	Grettir Heimisson	2884	Zig	2025-10-28 10:48:33

Solution running time distribution