Problem A
Booking a Room — Problem Statistics

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Submissions	15147
Accepted submissions	6874
Submission ratio	45.38%
Authors	6361
Full solves [?]	5927
Full solve Ratio	93.18%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.01 s	Bash	2025-09-12 20:07:49

#	User	Runtime	Language	Date
1	Joe Amenta	0.01 s	C#	2016-04-09 01:40:41
2	Mads Storm Hansen	0.02 s	C#	2015-07-18 14:20:36
3	Niklas Huss	0.02 s	C#	2015-09-12 11:13:30
4	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-05-04 15:03:10
5	Duelene Olson	0.02 s	C#	2016-06-08 00:16:59
6	Robert Low	0.02 s	C#	2016-07-17 18:18:14
7	Linda Hansson	0.02 s	C#	2016-07-31 15:08:14
8	Ugnius Skučas	0.02 s	C#	2016-10-09 19:51:03
9	Ludwig Hedeby	0.02 s	C#	2016-10-10 13:06:39
10	Linnéa Teigen	0.02 s	C#	2016-10-10 14:51:15

#	User	Runtime	Language	Date
1	Benjamin Darnell	0.00 s	COBOL	2020-10-07 07:28:24

#	User	Runtime	Language	Date
1	Dmytro Bihniak	0.01 s	Common Lisp	2019-08-06 09:27:02
2	David Cawthon	0.01 s	Common Lisp	2020-07-18 03:14:53

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.04 s	F#	2022-08-13 08:30:25

#	User	Runtime	Language	Date
1	Georgios Leandros Kyriazis	0.02 s	Go	2023-02-24 16:21:50
2	Alejandro Germain	0.07 s	Go	2018-10-17 22:05:40
3	Jinwoo Lee	0.07 s	Go	2018-12-26 19:22:32
4	Reza Morsali	0.07 s	Go	2018-12-30 11:18:20
5	Krzysztof Gibuła	0.07 s	Go	2019-03-14 19:47:30
6	Sander Hellesø	0.07 s	Go	2019-04-12 17:50:27
7	Norbert Voelker	0.07 s	Go	2021-04-23 16:21:05
8	Jonas Hedin	0.08 s	Go	2015-02-25 22:34:16
9	Hidden user	0.08 s	Go	2016-07-28 18:56:11
10	Giles Hutton	0.08 s	Go	2016-08-21 17:36:51

#	User	Runtime	Language	Date
1	Bala Krishna	0.04 s	Java	2024-08-16 13:14:44
2	Lim Shao Qi	0.04 s	Java	2024-10-17 09:44:37
3	Guangyi Zhou	0.04 s	Java	2024-12-06 17:45:55
4	Abdur-Rahman Ahmed	0.04 s	Java	2025-09-29 19:31:57
5	Kell Skogh	0.05 s	Java	2015-06-21 13:37:55
6	Đỗ Duy Tân	0.05 s	Java	2015-09-10 08:11:14
7	Tú Huỳnh	0.05 s	Java	2015-09-10 16:07:57
8	Hanh Nguyen	0.05 s	Java	2015-09-11 01:32:07
9	Pål Forsberg	0.05 s	Java	2015-09-30 11:53:17
10	Dennis Ang	0.05 s	Java	2015-10-01 13:45:58

#	User	Runtime	Language	Date
1	Daniel Jessen	0.04 s	JavaScript (Node.js)	2025-03-28 16:00:10
2	Thomas Kobak	0.05 s	JavaScript (Node.js)	2019-02-22 23:51:20
3	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-03-09 17:31:04
4	kenny	0.05 s	JavaScript (Node.js)	2023-09-27 07:51:43
5	Brandon Rude	0.05 s	JavaScript (Node.js)	2023-10-10 03:37:18
6	Hidden user	0.05 s	JavaScript (Node.js)	2023-10-11 00:25:24
7	KraftaN	0.05 s	JavaScript (Node.js)	2023-11-10 20:48:05
8	TEJA KUSUMA	0.05 s	JavaScript (Node.js)	2024-02-06 14:59:50
9	Hidden user	0.05 s	JavaScript (Node.js)	2024-07-05 02:14:10
10	luna lovegood	0.07 s	JavaScript (Node.js)	2019-01-21 05:32:12

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-20 22:41:42
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-01-26 07:40:12
3	Fredrik Ekholm	0.01 s	JavaScript (SpiderMonkey)	2016-10-20 07:09:26
4	J M	0.01 s	JavaScript (SpiderMonkey)	2016-11-06 19:33:43
5	Ionel Hindorean	0.01 s	JavaScript (SpiderMonkey)	2016-12-02 18:48:34
6	Spencer Smith	0.01 s	JavaScript (SpiderMonkey)	2017-06-02 04:16:14
7	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-28 18:51:39
8	Hai Yang Xu	0.01 s	JavaScript (SpiderMonkey)	2017-09-24 02:29:55
9	Andrea Bianchessi	0.01 s	JavaScript (SpiderMonkey)	2017-10-20 08:57:38
10	Zachary DeStefano	0.01 s	JavaScript (SpiderMonkey)	2018-01-30 15:37:40

#	User	Runtime	Language	Date
1	Hidden user	0.46 s	Julia	2025-04-12 18:27:36
2	Timothy Gaede	0.51 s	Julia	2024-03-29 07:21:05
3	Danny Robinson	0.58 s	Julia	2023-06-21 14:18:41

#	User	Runtime	Language	Date
1	Johnny Baloney	0.14 s	Kotlin	2022-01-14 14:42:03
2	Joey Haas	0.15 s	Kotlin	2018-12-19 19:55:55
3	Jacob Huebner	0.16 s	Kotlin	2020-03-17 04:07:35
4	Dayan Ruben Gonzalez	0.16 s	Kotlin	2020-09-28 17:15:06
5	Ahmed Waseem Saeed	0.16 s	Kotlin	2021-12-19 13:37:23
6	Phường Lên	0.18 s	Kotlin	2019-12-25 03:58:56
7	Jahid Hasan Imon	0.18 s	Kotlin	2020-05-22 20:12:14
8	James WIlliams	0.18 s	Kotlin	2020-09-29 05:10:08
9	Neil Harmon	0.19 s	Kotlin	2019-05-03 08:01:31
10	Adam Koprowski	0.19 s	Kotlin	2020-09-08 07:58:51

#	User	Runtime	Language	Date
1	Ayoub Meskour	0.00 s	Objective-C	2016-06-10 09:00:49

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-05-08 20:31:56
2	Junyu Zhan	0.00 s	Odin	2026-01-19 14:16:48

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2017-08-08 15:06:44
2	Vova Podkorytov	0.00 s	Pascal	2017-12-19 18:24:22
3	Egor Shchetinin	0.00 s	Pascal	2018-01-15 14:18:25
4	林達炘4D20 Lam Tat Yan	0.00 s	Pascal	2020-02-19 04:15:58
5	David Connolly	0.00 s	Pascal	2023-05-03 16:45:50

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	PHP	2018-03-29 17:43:11
2	Caleb Amolo	0.01 s	PHP	2019-09-11 13:55:56
3	Connor Billings	0.01 s	PHP	2020-01-02 15:20:00
4	Rakibul Hassan	0.01 s	PHP	2021-01-18 01:03:09
5	cojonas1	0.01 s	PHP	2021-02-18 12:53:44
6	Eko Priyanto	0.01 s	PHP	2021-09-12 08:28:31
7	Andre Wahyudi	0.01 s	PHP	2023-05-26 08:58:45
8	Renate Fiala-Lundström	0.01 s	PHP	2023-07-20 23:05:35
9	Susanne Ragnemalm	0.01 s	PHP	2024-05-06 16:01:19

#	User	Runtime	Language	Date
1	Hadi Qovaizi	0.01 s	Prolog	2016-04-18 04:36:43
2	Andriy Zyevakov	0.01 s	Prolog	2018-11-19 16:57:58
3	Hakan Kjellerstrand	0.02 s	Prolog	2023-01-20 09:33:15

#	User	Runtime	Language	Date
1	Daniel Palmqvist	0.02 s	Python 2	2014-12-24 16:06:50
2	Christofer Ohlsson	0.02 s	Python 2	2015-04-05 07:31:47
3	Erik Odenman	0.02 s	Python 2	2015-05-20 23:53:37
4	Johannes Agestam	0.02 s	Python 2	2015-06-23 16:30:03
5	Quan Huynh	0.02 s	Python 2	2015-09-10 10:44:36
6	Carl Martin Rosenberg	0.02 s	Python 2	2015-09-19 08:00:00
7	Zbigniew Winiarski	0.02 s	Python 2	2015-10-26 17:01:12
8	Urban Pettersson	0.02 s	Python 2	2015-10-29 20:03:50
9	Izzati Al Vandiar	0.02 s	Python 2	2015-11-02 07:37:01
10	Frederik Højholt	0.02 s	Python 2	2015-11-13 08:48:19

#	User	Runtime	Language	Date
1	Martin Stensgård	0.02 s	Python 3	2015-03-15 23:18:42
2	Saša Levstik	0.02 s	Python 3	2015-05-18 09:02:11
3	Tristan van Leeuwen	0.02 s	Python 3	2015-05-26 19:05:44
4	James Elías Sigurðarson	0.02 s	Python 3	2015-06-01 00:00:36
5	Johannes Agestam	0.02 s	Python 3	2015-06-23 16:19:26
6	Julija Oblak	0.02 s	Python 3	2015-07-10 09:30:29
7	Arnar Leifsson	0.02 s	Python 3	2015-08-06 14:21:09
8	Baldur Tryggvason	0.02 s	Python 3	2015-08-06 16:59:00
9	Ziga Staresinic	0.02 s	Python 3	2015-09-09 13:54:10
10	Maran	0.02 s	Python 3	2015-10-23 20:43:24

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-01-24 15:47:43
2	Gerry Hall	0.03 s	Ruby	2016-03-26 03:02:39
3	Lasse Berglund	0.03 s	Ruby	2016-04-15 09:42:43
4	Yaman Shiekh Deia	0.03 s	Ruby	2016-05-14 23:40:59
5	Erik Rydbert	0.03 s	Ruby	2016-07-07 07:50:32
6	Hidden user	0.03 s	Ruby	2016-08-12 06:11:02
7	Chris Weston	0.03 s	Ruby	2016-09-28 00:35:37
8	Mikee May Ojastro	0.03 s	Ruby	2017-06-08 05:39:52
9	Donald Dong	0.04 s	Ruby	2018-11-19 06:00:04
10	Savvas Alexandrou	0.04 s	Ruby	2018-12-09 16:29:13

#	User	Runtime	Language	Date
1	Cyril Chaize	0.05 s	TypeScript	2023-12-31 16:57:07

#	User	Runtime	Language	Date
1	Joe Blower	0.00 s	Zig	2025-05-29 03:25:38

#	User	Length	Language	Date
1	Chenzhang Hu	56	Bash	2025-09-12 20:07:49

#	User	Length	Language	Date
1	Martin Blom	139	C	2023-12-27 21:11:00
2	Philipp Hergenhahn	235	C	2025-01-03 13:03:48
3	Thibault Raffaillac	298	C	2016-11-28 16:18:06
4	Andros Clarence Chen	303	C	2020-12-19 13:00:01
5	Matthew Hartono	317	C	2022-10-24 09:42:50
6	Aviral Utkarsh	319	C	2017-01-08 14:54:21
7	Hidden user	332	C	2017-02-03 05:27:06
8	Anton Haglund	345	C	2016-12-05 18:35:07
9	Yap Yi Juinn Jacelyn	346	C	2016-12-17 08:41:18
10	Hidden user	347	C	2018-10-31 19:44:33

#	User	Length	Language	Date
1	Esty Crow	509	C#	2023-09-30 01:59:20
2	Marek Bina	512	C#	2019-02-15 19:45:33
3	Shaun Lazaro	586	C#	2016-11-29 23:41:35
4	Christian Sumares	607	C#	2020-05-14 10:18:09
5	Thomas Norris	660	C#	2019-06-24 07:23:42
6	Henrik Andersson	668	C#	2018-10-28 21:00:35
7	Ana Anderlič	671	C#	2024-01-15 19:24:19
8	Schuyler Tay	674	C#	2020-12-28 11:12:03
9	Michael Damsgaard	689	C#	2024-11-24 20:35:45
10	Hidden user	695	C#	2017-04-20 16:00:56

#	User	Length	Language	Date
1	Frans Meulenbroeks	150	C++	2024-11-24 13:32:40
2	Tyler Fernando	168	C++	2023-06-26 03:49:26
3	Jonas Rouven Schoenauer	188	C++	2023-12-06 17:36:09
4	Hidden user	190	C++	2024-03-07 20:52:10
5	a_b__c	196	C++	2021-02-11 17:51:27
6	SiBi	231	C++	2018-12-29 16:30:35
7	Trang Hoang	241	C++	2022-11-12 08:02:11
8	hc nguyen	249	C++	2022-11-12 09:01:23
9	Dhipta Raditya	251	C++	2016-02-04 02:16:26
10	Ritchie Goldwin	257	C++	2019-01-06 16:16:30

#	User	Length	Language	Date
1	Benjamin Darnell	1300	COBOL	2020-10-07 07:28:24

#	User	Length	Language	Date
1	Dmytro Bihniak	368	Common Lisp	2019-08-06 09:27:02
2	David Cawthon	438	Common Lisp	2020-07-18 03:14:53

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	543	F#	2022-08-13 08:30:25

#	User	Length	Language	Date
1	Giles Hutton	359	Go	2016-08-21 17:36:51
2	Jonas Hedin	429	Go	2015-02-25 22:34:16
3	Jinwoo Lee	452	Go	2018-12-26 19:22:32
4	Krzysztof Gibuła	519	Go	2019-03-14 19:47:30
5	Reza Morsali	554	Go	2018-12-30 11:18:20
6	Alejandro Germain	556	Go	2018-10-17 22:05:40
7	Hidden user	623	Go	2016-07-28 18:56:11
8	Georgios Leandros Kyriazis	706	Go	2023-02-24 16:21:50
9	Kristoffer Åhgren	725	Go	2017-05-02 17:17:52
10	Hidden user	861	Go	2019-09-22 00:55:31

#	User	Length	Language	Date
1	David Wärn	176	Haskell	2015-10-09 10:23:41
2	Frederik Haagensen	198	Haskell	2019-10-24 17:50:59
3	Fran Cruz Zamorano	237	Haskell	2018-12-23 18:50:43
4	Llaurence Git	247	Haskell	2018-11-09 09:47:53
5	Steinar Simonnes	264	Haskell	2024-01-22 11:29:37
6	Freek van Keulen	276	Haskell	2021-02-12 14:19:24
7	Jan Hrček	304	Haskell	2020-10-27 10:42:09
8	Qi Ji	320	Haskell	2018-06-20 01:06:32
9	Hidden user	331	Haskell	2025-04-05 13:52:31
10	Noah Harvey	340	Haskell	2016-10-13 10:16:47

#	User	Length	Language	Date
1	Frederik Buur	334	Java	2023-10-17 12:23:59
2	Mitch Price	415	Java	2016-08-31 23:14:16
3	Hidden user	415	Java	2019-09-08 13:00:41
4	Zimu Qin	419	Java	2015-07-18 04:21:36
5	Udit Sanghi	422	Java	2021-07-18 06:55:10
6	Thanh Le	427	Java	2023-03-11 02:27:58
7	Keith Raghubar	428	Java	2016-01-25 17:03:10
8	Nguyễn Mạnh Phúc	429	Java	2017-10-04 12:29:51
9	Nanda Thant Sin	430	Java	2018-05-09 08:57:41
10	Drew Hoover	435	Java	2015-09-11 04:47:26

#	User	Length	Language	Date
1	Gurpartap Singh Bhatti	495	JavaScript (Node.js)	2019-03-09 17:31:04
2	Chris Wong	516	JavaScript (Node.js)	2021-02-23 22:03:54
3	Daniel Jessen	548	JavaScript (Node.js)	2025-03-28 15:34:55
4	Howard Tin Chi Chan	561	JavaScript (Node.js)	2021-03-04 22:35:11
5	Alan Balderrama	565	JavaScript (Node.js)	2023-03-19 03:39:55
6	Zlátko Prodán	577	JavaScript (Node.js)	2023-07-10 14:10:31
7	Hidden user	581	JavaScript (Node.js)	2023-08-28 01:35:05
8	Thomas Kobak	585	JavaScript (Node.js)	2019-02-22 23:51:20
9	Greg Gorlen	609	JavaScript (Node.js)	2021-10-13 20:01:17
10	Hidden user	638	JavaScript (Node.js)	2023-10-11 00:25:24

#	User	Length	Language	Date
1	Jimmy Gustafsson	146	JavaScript (SpiderMonkey)	2024-07-12 22:14:17
2	Bjørn Chr. Soltvedt	269	JavaScript (SpiderMonkey)	2016-01-26 07:40:12
3	Zachary DeStefano	276	JavaScript (SpiderMonkey)	2018-01-30 15:37:40
4	Davíð Helgason	292	JavaScript (SpiderMonkey)	2019-06-20 21:04:53
5	Zach Tschetter	293	JavaScript (SpiderMonkey)	2023-04-22 21:29:49
6	Evan Magill	302	JavaScript (SpiderMonkey)	2024-04-21 23:48:16
7	Christian Pilegaard Cederquist	309	JavaScript (SpiderMonkey)	2023-01-12 14:41:35
8	Peter Menyes	342	JavaScript (SpiderMonkey)	2017-08-28 18:51:39
9	Casey Smith	343	JavaScript (SpiderMonkey)	2019-05-24 20:29:15
10	J M	347	JavaScript (SpiderMonkey)	2016-11-06 19:33:43

#	User	Length	Language	Date
1	Hidden user	95	Julia	2025-04-12 18:29:58
2	Danny Robinson	111	Julia	2023-06-21 14:18:41
3	Timothy Gaede	342	Julia	2024-03-29 07:21:05

#	User	Length	Language	Date
1	Troy Warmboe	280	Kotlin	2020-02-11 18:20:10
2	Jahid Hasan Imon	335	Kotlin	2020-05-22 20:12:14
3	Dmitry Shostak	348	Kotlin	2018-08-20 08:07:29
4	Phường Lên	366	Kotlin	2019-12-25 03:58:56
5	Chris Johnson	402	Kotlin	2023-11-27 22:24:01
6	Lewis Johnson	402	Kotlin	2023-11-27 22:28:55
7	Karl Johan Heimark	409	Kotlin	2024-05-23 18:35:44
8	Adam Koprowski	419	Kotlin	2020-09-08 07:58:51
9	Adam Rankin	433	Kotlin	2023-04-22 17:21:26
10	Eloy Hernández	440	Kotlin	2021-10-06 16:18:07

#	User	Length	Language	Date
1	Ayoub Meskour	446	Objective-C	2016-06-10 09:00:49

#	User	Length	Language	Date
1	Hidden user	729	Odin	2025-05-08 20:31:56
2	Junyu Zhan	977	Odin	2026-01-19 14:16:48

#	User	Length	Language	Date
1	Ingemar Ragnemalm	414	Pascal	2017-08-08 15:06:44
2	Egor Shchetinin	567	Pascal	2018-01-15 14:18:25
3	Vova Podkorytov	606	Pascal	2017-12-19 18:24:22
4	David Connolly	648	Pascal	2023-05-03 16:45:50
5	林達炘4D20 Lam Tat Yan	649	Pascal	2020-02-19 04:15:58

#	User	Length	Language	Date
1	Connor Billings	320	PHP	2020-01-02 15:20:00
2	Hidden user	360	PHP	2018-03-29 17:43:11
3	Eko Priyanto	410	PHP	2021-09-12 08:28:31
4	Caleb Amolo	416	PHP	2019-09-11 13:55:56
5	Rakibul Hassan	416	PHP	2021-01-18 01:03:09
6	Renate Fiala-Lundström	493	PHP	2023-07-20 23:05:35
7	cojonas1	508	PHP	2021-02-18 12:53:44
8	Susanne Ragnemalm	629	PHP	2024-05-06 16:01:19
9	Andre Wahyudi	731	PHP	2023-05-26 08:58:45

#	User	Length	Language	Date
1	Hakan Kjellerstrand	278	Prolog	2023-02-16 09:59:12
2	Andriy Zyevakov	373	Prolog	2018-11-19 16:57:58
3	Hadi Qovaizi	5091	Prolog	2016-04-18 04:36:43

#	User	Length	Language	Date
1	Thomas Feld	124	Python 2	2019-08-19 11:08:39
2	Kuan Wei Heng	130	Python 2	2018-11-21 08:47:18
3	Erik Odenman	144	Python 2	2015-05-20 23:53:37
4	Klas af Geijerstam	159	Python 2	2018-11-12 20:49:51
5	Neal Zane	176	Python 2	2016-03-08 08:28:30
6	Jesper Öqvist	182	Python 2	2018-10-20 16:17:02
7	Shounak Dey	186	Python 2	2017-03-18 18:10:50
8	Cole Bite	189	Python 2	2017-04-04 19:41:31
9	Arne Tobias Malkenes Ødegaard	190	Python 2	2015-10-01 16:01:46
10	Asger Hautop Drewsen	192	Python 2	2015-11-18 08:17:10

#	User	Length	Language	Date
1	Avery	83	Python 3	2025-07-31 00:19:13
2	Clement Oh	86	Python 3	2023-06-13 16:29:40
3	Gustav Elmqvist	110	Python 3	2023-02-13 16:00:15
4	Charles Ancheta	119	Python 3	2023-03-24 08:37:22
5	Collin Simpson	119	Python 3	2025-08-31 06:03:39
6	ACMCSU	119	Python 3	2025-08-31 06:04:13
7	Qianlang Chen	123	Python 3	2022-10-26 07:26:48
8	Shashank Bhatt	132	Python 3	2024-06-20 23:59:23
9	Farzam Abrishami	136	Python 3	2024-11-03 01:33:46
10	Ryan Farrell	138	Python 3	2023-09-02 23:55:35

#	User	Length	Language	Date
1	Thomas Feld	50	Ruby	2023-02-09 10:46:49
2	Russell Ng	52	Ruby	2025-12-12 22:31:01
3	Eugen Neagoe	161	Ruby	2023-06-19 10:35:49
4	Macdara mac an tSionnaigh	169	Ruby	2019-10-01 21:38:36
5	Hidden user	211	Ruby	2019-03-04 11:19:09
6	Casper Christensen	221	Ruby	2016-01-24 15:47:43
7	Kok Dith	239	Ruby	2021-08-18 09:35:22
8	Donald Dong	267	Ruby	2018-11-19 06:00:04
9	Sebastian Oveland	280	Ruby	2020-03-22 14:04:27
10	Garrett Shropshire	284	Ruby	2022-12-09 16:47:39

#	User	Length	Language	Date
1	Vincent Lagerros	223	Rust	2024-11-24 18:35:33
2	Emil Dichmann	481	Rust	2025-09-20 11:15:30
3	Henry Jacobson	531	Rust	2022-10-24 17:22:12
4	Pankajkumar Patro	624	Rust	2024-08-03 20:22:57
5	Bas Dirks	645	Rust	2022-01-05 04:15:35
6	Ryan Mueller	760	Rust	2023-12-01 14:02:24
7	Reis Faar	945	Rust	2023-09-06 04:06:00
8	Krzys Hejno	982	Rust	2025-02-17 19:33:13
9	Isak Jägberg	992	Rust	2019-08-20 15:10:47
10	Eric Pinter	1050	Rust	2021-07-23 03:47:38

#	User	Length	Language	Date
1	Cyril Chaize	720	TypeScript	2023-12-31 16:57:07

#	User	Length	Language	Date
1	Joe Blower	1059	Zig	2025-05-29 03:25:38

Solution running time distribution