Problem A
Booking a Room — Problem Statistics

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Submissions	15165
Accepted submissions	6886
Submission ratio	45.41%
Authors	6366
Full solves [?]	5932
Full solve Ratio	93.18%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.01 s	Bash	2025-09-12 22:07:49

#	User	Runtime	Language	Date
1	Joe Amenta	0.01 s	C#	2016-04-09 03:40:41
2	Mads Storm Hansen	0.02 s	C#	2015-07-18 16:20:36
3	Niklas Huss	0.02 s	C#	2015-09-12 13:13:30
4	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-05-04 17:03:10
5	Duelene Olson	0.02 s	C#	2016-06-08 02:16:59
6	Robert Low	0.02 s	C#	2016-07-17 20:18:14
7	Linda Hansson	0.02 s	C#	2016-07-31 17:08:14
8	Ugnius Skučas	0.02 s	C#	2016-10-09 21:51:03
9	Ludwig Hedeby	0.02 s	C#	2016-10-10 15:06:39
10	Linnéa Teigen	0.02 s	C#	2016-10-10 16:51:15

#	User	Runtime	Language	Date
1	Benjamin Darnell	0.00 s	COBOL	2020-10-07 09:28:24

#	User	Runtime	Language	Date
1	Dmytro Bihniak	0.01 s	Common Lisp	2019-08-06 11:27:02
2	David Cawthon	0.01 s	Common Lisp	2020-07-18 05:14:53

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.04 s	F#	2022-08-13 10:30:25

#	User	Runtime	Language	Date
1	Georgios Leandros Kyriazis	0.02 s	Go	2023-02-24 17:21:50
2	Alejandro Germain	0.07 s	Go	2018-10-18 00:05:40
3	Jinwoo Lee	0.07 s	Go	2018-12-26 20:22:32
4	Reza Morsali	0.07 s	Go	2018-12-30 12:18:20
5	Krzysztof Gibuła	0.07 s	Go	2019-03-14 20:47:30
6	Sander Hellesø	0.07 s	Go	2019-04-12 19:50:27
7	Norbert Voelker	0.07 s	Go	2021-04-23 18:21:05
8	Jonas Hedin	0.08 s	Go	2015-02-25 23:34:16
9	Hidden user	0.08 s	Go	2016-07-28 20:56:11
10	Giles Hutton	0.08 s	Go	2016-08-21 19:36:51

#	User	Runtime	Language	Date
1	Bala Krishna	0.04 s	Java	2024-08-16 15:14:44
2	Lim Shao Qi	0.04 s	Java	2024-10-17 11:44:37
3	Guangyi Zhou	0.04 s	Java	2024-12-06 18:45:55
4	Abdur-Rahman Ahmed	0.04 s	Java	2025-09-29 21:31:57
5	Kell Skogh	0.05 s	Java	2015-06-21 15:37:55
6	Đỗ Duy Tân	0.05 s	Java	2015-09-10 10:11:14
7	Tú Huỳnh	0.05 s	Java	2015-09-10 18:07:57
8	Hanh Nguyen	0.05 s	Java	2015-09-11 03:32:07
9	Pål Forsberg	0.05 s	Java	2015-09-30 13:53:17
10	Dennis Ang	0.05 s	Java	2015-10-01 15:45:58

#	User	Runtime	Language	Date
1	Daniel Jessen	0.04 s	JavaScript (Node.js)	2025-03-28 17:00:10
2	Thomas Kobak	0.05 s	JavaScript (Node.js)	2019-02-23 00:51:20
3	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-03-09 18:31:04
4	kenny	0.05 s	JavaScript (Node.js)	2023-09-27 09:51:43
5	Brandon Rude	0.05 s	JavaScript (Node.js)	2023-10-10 05:37:18
6	Hidden user	0.05 s	JavaScript (Node.js)	2023-10-11 02:25:24
7	KraftaN	0.05 s	JavaScript (Node.js)	2023-11-10 21:48:05
8	TEJA KUSUMA	0.05 s	JavaScript (Node.js)	2024-02-06 15:59:50
9	Hidden user	0.05 s	JavaScript (Node.js)	2024-07-05 04:14:10
10	luna lovegood	0.07 s	JavaScript (Node.js)	2019-01-21 06:32:12

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-20 23:41:42
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-01-26 08:40:12
3	Fredrik Ekholm	0.01 s	JavaScript (SpiderMonkey)	2016-10-20 09:09:26
4	J M	0.01 s	JavaScript (SpiderMonkey)	2016-11-06 20:33:43
5	Ionel Hindorean	0.01 s	JavaScript (SpiderMonkey)	2016-12-02 19:48:34
6	Spencer Smith	0.01 s	JavaScript (SpiderMonkey)	2017-06-02 06:16:14
7	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-28 20:51:39
8	Hai Yang Xu	0.01 s	JavaScript (SpiderMonkey)	2017-09-24 04:29:55
9	Andrea Bianchessi	0.01 s	JavaScript (SpiderMonkey)	2017-10-20 10:57:38
10	Zachary DeStefano	0.01 s	JavaScript (SpiderMonkey)	2018-01-30 16:37:40

#	User	Runtime	Language	Date
1	Hidden user	0.46 s	Julia	2025-04-12 20:27:36
2	Timothy Gaede	0.51 s	Julia	2024-03-29 08:21:05
3	Danny Robinson	0.58 s	Julia	2023-06-21 16:18:41

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

#	User	Runtime	Language	Date
1	Ayoub Meskour	0.00 s	Objective-C	2016-06-10 11:00:49

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-05-08 22:31:56
2	Junyu Zhan	0.00 s	Odin	2026-01-19 15:16:48

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2017-08-08 17:06:44
2	Vova Podkorytov	0.00 s	Pascal	2017-12-19 19:24:22
3	Egor Shchetinin	0.00 s	Pascal	2018-01-15 15:18:25
4	林達炘4D20 Lam Tat Yan	0.00 s	Pascal	2020-02-19 05:15:58
5	David Connolly	0.00 s	Pascal	2023-05-03 18:45:50

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	PHP	2018-03-29 19:43:11
2	Caleb Amolo	0.01 s	PHP	2019-09-11 15:55:56
3	Connor Billings	0.01 s	PHP	2020-01-02 16:20:00
4	Rakibul Hassan	0.01 s	PHP	2021-01-18 02:03:09
5	cojonas1	0.01 s	PHP	2021-02-18 13:53:44
6	Eko Priyanto	0.01 s	PHP	2021-09-12 10:28:31
7	Andre Wahyudi	0.01 s	PHP	2023-05-26 10:58:45
8	Renate Fiala-Lundström	0.01 s	PHP	2023-07-21 01:05:35
9	Susanne Ragnemalm	0.01 s	PHP	2024-05-06 18:01:19

#	User	Runtime	Language	Date
1	Hadi Qovaizi	0.01 s	Prolog	2016-04-18 06:36:43
2	Andriy Zyevakov	0.01 s	Prolog	2018-11-19 17:57:58
3	Hakan Kjellerstrand	0.02 s	Prolog	2023-01-20 10:33:15

#	User	Runtime	Language	Date
1	Daniel Palmqvist	0.02 s	Python 2	2014-12-24 17:06:50
2	Christofer Ohlsson	0.02 s	Python 2	2015-04-05 09:31:47
3	Erik Odenman	0.02 s	Python 2	2015-05-21 01:53:37
4	Johannes Agestam	0.02 s	Python 2	2015-06-23 18:30:03
5	Quan Huynh	0.02 s	Python 2	2015-09-10 12:44:36
6	Carl Martin Rosenberg	0.02 s	Python 2	2015-09-19 10:00:00
7	Zbigniew Winiarski	0.02 s	Python 2	2015-10-26 18:01:12
8	Urban Pettersson	0.02 s	Python 2	2015-10-29 21:03:50
9	Izzati Al Vandiar	0.02 s	Python 2	2015-11-02 08:37:01
10	Frederik Højholt	0.02 s	Python 2	2015-11-13 09:48:19

#	User	Runtime	Language	Date
1	Martin Stensgård	0.02 s	Python 3	2015-03-16 00:18:42
2	Saša Levstik	0.02 s	Python 3	2015-05-18 11:02:11
3	Tristan van Leeuwen	0.02 s	Python 3	2015-05-26 21:05:44
4	James Elías Sigurðarson	0.02 s	Python 3	2015-06-01 02:00:36
5	Johannes Agestam	0.02 s	Python 3	2015-06-23 18:19:26
6	Julija Oblak	0.02 s	Python 3	2015-07-10 11:30:29
7	Arnar Leifsson	0.02 s	Python 3	2015-08-06 16:21:09
8	Baldur Tryggvason	0.02 s	Python 3	2015-08-06 18:59:00
9	Ziga Staresinic	0.02 s	Python 3	2015-09-09 15:54:10
10	Maran	0.02 s	Python 3	2015-10-23 22:43:24

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-01-24 16:47:43
2	Gerry Hall	0.03 s	Ruby	2016-03-26 04:02:39
3	Lasse Berglund	0.03 s	Ruby	2016-04-15 11:42:43
4	Yaman Shiekh Deia	0.03 s	Ruby	2016-05-15 01:40:59
5	Erik Rydbert	0.03 s	Ruby	2016-07-07 09:50:32
6	Hidden user	0.03 s	Ruby	2016-08-12 08:11:02
7	Chris Weston	0.03 s	Ruby	2016-09-28 02:35:37
8	Mikee May Ojastro	0.03 s	Ruby	2017-06-08 07:39:52
9	Donald Dong	0.04 s	Ruby	2018-11-19 07:00:04
10	Savvas Alexandrou	0.04 s	Ruby	2018-12-09 17:29:13

#	User	Runtime	Language	Date
1	Cyril Chaize	0.05 s	TypeScript	2023-12-31 17:57:07

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

#	User	Length	Language	Date
1	Chenzhang Hu	56	Bash	2025-09-12 22:07:49

#	User	Length	Language	Date
1	Martin Blom	139	C	2023-12-27 22:11:00
2	Philipp Hergenhahn	235	C	2025-01-03 14:03:48
3	Thibault Raffaillac	298	C	2016-11-28 17:18:06
4	Andros Clarence Chen	303	C	2020-12-19 14:00:01
5	Matthew Hartono	317	C	2022-10-24 11:42:50
6	Aviral Utkarsh	319	C	2017-01-08 15:54:21
7	Hidden user	332	C	2017-02-03 06:27:06
8	Anton Haglund	345	C	2016-12-05 19:35:07
9	Yap Yi Juinn Jacelyn	346	C	2016-12-17 09:41:18
10	Hidden user	347	C	2018-10-31 20:44:33

#	User	Length	Language	Date
1	Esty Crow	509	C#	2023-09-30 03:59:20
2	Marek Bina	512	C#	2019-02-15 20:45:33
3	Shaun Lazaro	586	C#	2016-11-30 00:41:35
4	Christian Sumares	607	C#	2020-05-14 12:18:09
5	Thomas Norris	660	C#	2019-06-24 09:23:42
6	Henrik Andersson	668	C#	2018-10-28 22:00:35
7	Ana Anderlič	671	C#	2024-01-15 20:24:19
8	Schuyler Tay	674	C#	2020-12-28 12:12:03
9	Michael Damsgaard	689	C#	2024-11-24 21:35:45
10	Hidden user	695	C#	2017-04-20 18:00:56

#	User	Length	Language	Date
1	Frans Meulenbroeks	150	C++	2024-11-24 14:32:40
2	Tyler Fernando	168	C++	2023-06-26 05:49:26
3	Jonas Rouven Schoenauer	188	C++	2023-12-06 18:36:09
4	Hidden user	190	C++	2024-03-07 21:52:10
5	a_b__c	196	C++	2021-02-11 18:51:27
6	SiBi	231	C++	2018-12-29 17:30:35
7	Trang Hoang	241	C++	2022-11-12 09:02:11
8	hc nguyen	249	C++	2022-11-12 10:01:23
9	Dhipta Raditya	251	C++	2016-02-04 03:16:26
10	Ritchie Goldwin	257	C++	2019-01-06 17:16:30

#	User	Length	Language	Date
1	Benjamin Darnell	1300	COBOL	2020-10-07 09:28:24

#	User	Length	Language	Date
1	Dmytro Bihniak	368	Common Lisp	2019-08-06 11:27:02
2	David Cawthon	438	Common Lisp	2020-07-18 05:14:53

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	543	F#	2022-08-13 10:30:25

#	User	Length	Language	Date
1	Giles Hutton	359	Go	2016-08-21 19:36:51
2	Jonas Hedin	429	Go	2015-02-25 23:34:16
3	Jinwoo Lee	452	Go	2018-12-26 20:22:32
4	Krzysztof Gibuła	519	Go	2019-03-14 20:47:30
5	Reza Morsali	554	Go	2018-12-30 12:18:20
6	Alejandro Germain	556	Go	2018-10-18 00:05:40
7	Hidden user	623	Go	2016-07-28 20:56:11
8	Georgios Leandros Kyriazis	706	Go	2023-02-24 17:21:50
9	Kristoffer Åhgren	725	Go	2017-05-02 19:17:52
10	Hidden user	861	Go	2019-09-22 02:55:31

#	User	Length	Language	Date
1	David Wärn	176	Haskell	2015-10-09 12:23:41
2	Frederik Haagensen	198	Haskell	2019-10-24 19:50:59
3	Fran Cruz Zamorano	237	Haskell	2018-12-23 19:50:43
4	Llaurence Git	247	Haskell	2018-11-09 10:47:53
5	Steinar Simonnes	264	Haskell	2024-01-22 12:29:37
6	Freek van Keulen	276	Haskell	2021-02-12 15:19:24
7	Jan Hrček	304	Haskell	2020-10-27 11:42:09
8	Qi Ji	320	Haskell	2018-06-20 03:06:32
9	Hidden user	331	Haskell	2025-04-05 15:52:31
10	Noah Harvey	340	Haskell	2016-10-13 12:16:47

#	User	Length	Language	Date
1	Frederik Buur	334	Java	2023-10-17 14:23:59
2	Mitch Price	415	Java	2016-09-01 01:14:16
3	Hidden user	415	Java	2019-09-08 15:00:41
4	Zimu Qin	419	Java	2015-07-18 06:21:36
5	Udit Sanghi	422	Java	2021-07-18 08:55:10
6	Thanh Le	427	Java	2023-03-11 03:27:58
7	Keith Raghubar	428	Java	2016-01-25 18:03:10
8	Nguyễn Mạnh Phúc	429	Java	2017-10-04 14:29:51
9	Nanda Thant Sin	430	Java	2018-05-09 10:57:41
10	Drew Hoover	435	Java	2015-09-11 06:47:26

#	User	Length	Language	Date
1	Gurpartap Singh Bhatti	495	JavaScript (Node.js)	2019-03-09 18:31:04
2	Chris Wong	516	JavaScript (Node.js)	2021-02-23 23:03:54
3	Daniel Jessen	548	JavaScript (Node.js)	2025-03-28 16:34:55
4	Howard Tin Chi Chan	561	JavaScript (Node.js)	2021-03-04 23:35:11
5	Alan Balderrama	565	JavaScript (Node.js)	2023-03-19 04:39:55
6	Zlátko Prodán	577	JavaScript (Node.js)	2023-07-10 16:10:31
7	Hidden user	581	JavaScript (Node.js)	2023-08-28 03:35:05
8	Thomas Kobak	585	JavaScript (Node.js)	2019-02-23 00:51:20
9	Greg Gorlen	609	JavaScript (Node.js)	2021-10-13 22:01:17
10	Hidden user	638	JavaScript (Node.js)	2023-10-11 02:25:24

#	User	Length	Language	Date
1	Jimmy Gustafsson	146	JavaScript (SpiderMonkey)	2024-07-13 00:14:17
2	Bjørn Chr. Soltvedt	269	JavaScript (SpiderMonkey)	2016-01-26 08:40:12
3	Zachary DeStefano	276	JavaScript (SpiderMonkey)	2018-01-30 16:37:40
4	Davíð Helgason	292	JavaScript (SpiderMonkey)	2019-06-20 23:04:53
5	Zach Tschetter	293	JavaScript (SpiderMonkey)	2023-04-22 23:29:49
6	Evan Magill	302	JavaScript (SpiderMonkey)	2024-04-22 01:48:16
7	Christian Pilegaard Cederquist	309	JavaScript (SpiderMonkey)	2023-01-12 15:41:35
8	Peter Menyes	342	JavaScript (SpiderMonkey)	2017-08-28 20:51:39
9	Casey Smith	343	JavaScript (SpiderMonkey)	2019-05-24 22:29:15
10	J M	347	JavaScript (SpiderMonkey)	2016-11-06 20:33:43

#	User	Length	Language	Date
1	Hidden user	95	Julia	2025-04-12 20:29:58
2	Danny Robinson	111	Julia	2023-06-21 16:18:41
3	Timothy Gaede	342	Julia	2024-03-29 08:21:05

#	User	Length	Language	Date
1	Troy Warmboe	280	Kotlin	2020-02-11 19:20:10
2	Jahid Hasan Imon	335	Kotlin	2020-05-22 22:12:14
3	Dmitry Shostak	348	Kotlin	2018-08-20 10:07:29
4	Phường Lên	366	Kotlin	2019-12-25 04:58:56
5	Chris Johnson	402	Kotlin	2023-11-27 23:24:01
6	Lewis Johnson	402	Kotlin	2023-11-27 23:28:55
7	Karl Johan Heimark	409	Kotlin	2024-05-23 20:35:44
8	Adam Koprowski	419	Kotlin	2020-09-08 09:58:51
9	Adam Rankin	433	Kotlin	2023-04-22 19:21:26
10	Eloy Hernández	440	Kotlin	2021-10-06 18:18:07

#	User	Length	Language	Date
1	Ayoub Meskour	446	Objective-C	2016-06-10 11:00:49

#	User	Length	Language	Date
1	Hidden user	729	Odin	2025-05-08 22:31:56
2	Junyu Zhan	977	Odin	2026-01-19 15:16:48

#	User	Length	Language	Date
1	Ingemar Ragnemalm	414	Pascal	2017-08-08 17:06:44
2	Egor Shchetinin	567	Pascal	2018-01-15 15:18:25
3	Vova Podkorytov	606	Pascal	2017-12-19 19:24:22
4	David Connolly	648	Pascal	2023-05-03 18:45:50
5	林達炘4D20 Lam Tat Yan	649	Pascal	2020-02-19 05:15:58

#	User	Length	Language	Date
1	Connor Billings	320	PHP	2020-01-02 16:20:00
2	Hidden user	360	PHP	2018-03-29 19:43:11
3	Eko Priyanto	410	PHP	2021-09-12 10:28:31
4	Caleb Amolo	416	PHP	2019-09-11 15:55:56
5	Rakibul Hassan	416	PHP	2021-01-18 02:03:09
6	Renate Fiala-Lundström	493	PHP	2023-07-21 01:05:35
7	cojonas1	508	PHP	2021-02-18 13:53:44
8	Susanne Ragnemalm	629	PHP	2024-05-06 18:01:19
9	Andre Wahyudi	731	PHP	2023-05-26 10:58:45

#	User	Length	Language	Date
1	Hakan Kjellerstrand	278	Prolog	2023-02-16 10:59:12
2	Andriy Zyevakov	373	Prolog	2018-11-19 17:57:58
3	Hadi Qovaizi	5091	Prolog	2016-04-18 06:36:43

#	User	Length	Language	Date
1	Thomas Feld	124	Python 2	2019-08-19 13:08:39
2	Kuan Wei Heng	130	Python 2	2018-11-21 09:47:18
3	Erik Odenman	144	Python 2	2015-05-21 01:53:37
4	Klas af Geijerstam	159	Python 2	2018-11-12 21:49:51
5	Neal Zane	176	Python 2	2016-03-08 09:28:30
6	Jesper Öqvist	182	Python 2	2018-10-20 18:17:02
7	Shounak Dey	186	Python 2	2017-03-18 19:10:50
8	Cole Bite	189	Python 2	2017-04-04 21:41:31
9	Arne Tobias Malkenes Ødegaard	190	Python 2	2015-10-01 18:01:46
10	Asger Hautop Drewsen	192	Python 2	2015-11-18 09:17:10

#	User	Length	Language	Date
1	Avery	83	Python 3	2025-07-31 02:19:13
2	Clement Oh	86	Python 3	2023-06-13 18:29:40
3	Christian Kopping	107	Python 3	2026-03-30 14:25:36
4	Gustav Elmqvist	110	Python 3	2023-02-13 17:00:15
5	Charles Ancheta	119	Python 3	2023-03-24 09:37:22
6	Collin Simpson	119	Python 3	2025-08-31 08:03:39
7	ACMCSU	119	Python 3	2025-08-31 08:04:13
8	Qianlang Chen	123	Python 3	2022-10-26 09:26:48
9	Shashank Bhatt	132	Python 3	2024-06-21 01:59:23
10	Farzam Abrishami	136	Python 3	2024-11-03 02:33:46

#	User	Length	Language	Date
1	Thomas Feld	50	Ruby	2023-02-09 11:46:49
2	Russell Ng	52	Ruby	2025-12-12 23:31:01
3	Eugen Neagoe	161	Ruby	2023-06-19 12:35:49
4	Macdara mac an tSionnaigh	169	Ruby	2019-10-01 23:38:36
5	Hidden user	211	Ruby	2019-03-04 12:19:09
6	Casper Christensen	221	Ruby	2016-01-24 16:47:43
7	Kok Dith	239	Ruby	2021-08-18 11:35:22
8	Donald Dong	267	Ruby	2018-11-19 07:00:04
9	Sebastian Oveland	280	Ruby	2020-03-22 15:04:27
10	Garrett Shropshire	284	Ruby	2022-12-09 17:47:39

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

#	User	Length	Language	Date
1	Cyril Chaize	720	TypeScript	2023-12-31 17:57:07

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

Solution running time distribution