Problem A
Course Scheduling — Problem Statistics

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Submissions	2722
Accepted submissions	1567
Submission ratio	57.57%
Authors	1289
Full solves [?]	1206
Full solve Ratio	93.56%

#	User	Runtime	Language	Date
1	Danny Robinson	0.02 s	Bash	2023-10-31 14:27:53
2	Chenzhang Hu	0.03 s	Bash	2024-03-29 14:41:54

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.01 s	C	2020-11-18 12:38:56
2	Jacob Sutton	0.01 s	C	2021-01-06 03:52:52
3	Anton Siderud	0.01 s	C	2023-03-05 16:37:44
4	Julian Duniec	0.01 s	C	2023-09-18 13:57:08
5	Mirel Cosulschi	0.01 s	C	2024-07-24 18:37:58
6	Sami Al Chalati	0.03 s	C	2024-12-01 19:37:47

#	User	Runtime	Language	Date
1	Adrian Sølvberg	0.04 s	C#	2021-02-24 14:17:52
2	Anton Prasolov	0.04 s	C#	2021-02-24 14:55:41
3	Asbjørn Engås	0.04 s	C#	2021-02-24 19:23:01
4	Yuwono Bangun Nagoro	0.05 s	C#	2020-11-28 19:20:59
5	Lars-Håkon Nystad	0.05 s	C#	2021-02-23 21:49:25
6	Martin E	0.05 s	C#	2021-02-24 00:52:38
7	Eric Weiss	0.05 s	C#	2022-09-09 17:21:44
8	Sano Gharzani	0.05 s	C#	2023-12-01 13:30:46
9	traxex	0.05 s	C#	2024-05-27 08:01:23
10	Viktor Wesström	0.06 s	C#	2020-11-22 13:49:57

#	User	Runtime	Language	Date
1	David Avellan-Hultman	0.01 s	C++	2020-11-17 13:32:11
2	Daniel Schmekel	0.01 s	C++	2020-11-17 13:39:46
3	Bjarni Thor Karason	0.01 s	C++	2020-11-17 15:50:15
4	Tobias Glimmerfors	0.01 s	C++	2020-11-17 17:49:20
5	Max Holmberg	0.01 s	C++	2020-11-17 18:12:25
6	Hidden user	0.01 s	C++	2020-11-18 10:24:41
7	Cian Ruane	0.01 s	C++	2020-11-20 15:21:48
8	Frank Endriss	0.01 s	C++	2020-11-20 20:47:58
9	Tomas Lagland	0.01 s	C++	2020-11-21 23:22:53
10	Zac Friggstad	0.01 s	C++	2020-11-23 20:09:21

#	User	Runtime	Language	Date
1	Oisín Mac Fhearaí	0.02 s	Crystal	2024-08-29 10:56:04

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.09 s	F#	2022-10-15 09:21:16

#	User	Runtime	Language	Date
1	Daniel Agatan	0.02 s	Go	2025-02-24 17:04:41
2	Yitian Wang	0.04 s	Go	2023-03-09 11:13:25
3	Norbert Voelker	0.09 s	Go	2021-05-14 18:29:04
4	Adam Kjærsgaard Nielsen	0.33 s	Go	2024-08-27 11:10:32
5	Kaleb Petersen	0.34 s	Go	2025-03-22 18:37:14
6	Jack Kryger Sørensen	0.46 s	Go	2021-11-04 09:46:01
7	Resa Renaldy	0.50 s	Go	2021-08-03 10:37:16
8	Jahid Hasan Imon	0.59 s	Go	2022-11-23 08:08:43

#	User	Runtime	Language	Date
1	Øyvind Almli	0.02 s	Haskell	2022-11-18 08:21:59
2	Sebastian Banert	0.02 s	Haskell	2024-07-21 18:57:04
3	Brent Yorgey	0.03 s	Haskell	2020-11-20 23:49:38
4	Jan Hrček	0.03 s	Haskell	2021-03-21 13:17:37
5	Steinar Simonnes	0.05 s	Haskell	2024-02-02 16:00:34
6	Hidden user	0.06 s	Haskell	2023-01-03 11:36:14
7	Brian Hwang	0.06 s	Haskell	2024-05-14 22:25:20
8	Ng Tek In	0.07 s	Haskell	2022-08-18 08:32:26
9	Hidden user	0.10 s	Haskell	2021-05-30 13:04:02

#	User	Runtime	Language	Date
1	Crystal Sharpe	0.11 s	Java	2020-12-01 04:54:40
2	Sven Rönnbäck	0.12 s	Java	2021-12-23 07:59:04
3	Liam Keliher	0.14 s	Java	2021-08-19 01:31:33
4	Anish Kambhampati	0.14 s	Java	2022-01-13 00:16:04
5	Lee Jie-Ren Benedict	0.15 s	Java	2024-10-14 05:42:50
6	Lum Yi Ren Johannsen	0.15 s	Java	2024-10-22 16:49:53
7	Desireé af Geijerstam	0.16 s	Java	2021-06-20 11:03:39
8	Dat Vo Nguyen Tien	0.16 s	Java	2021-07-14 16:19:21
9	Julius Griebel	0.16 s	Java	2023-12-26 14:48:46
10	Daryl Ghee Shao Wen	0.16 s	Java	2024-10-14 07:17:40

#	User	Runtime	Language	Date
1	Hidden user	0.08 s	JavaScript (Node.js)	2024-07-07 21:29:57
2	Jira Angel	0.46 s	JavaScript (Node.js)	2021-04-15 06:11:11

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.04 s	JavaScript (SpiderMonkey)	2023-01-15 14:40:09
2	Zach Tschetter	0.05 s	JavaScript (SpiderMonkey)	2023-06-22 00:27:32
3	Jimmy Gustafsson	0.05 s	JavaScript (SpiderMonkey)	2024-07-08 20:47:21
4	Bjørn Chr. Soltvedt	0.06 s	JavaScript (SpiderMonkey)	2020-12-03 08:54:00
5	Peter Menyes	0.06 s	JavaScript (SpiderMonkey)	2021-10-12 21:04:59

#	User	Runtime	Language	Date
1	Timothy Gaede	0.59 s	Julia	2024-04-17 02:32:45
2	Danny Robinson	0.83 s	Julia	2023-10-31 14:17:08

#	User	Runtime	Language	Date
1	Martijn Muijsers	0.32 s	Kotlin	2024-05-31 12:23:23
2	Erik Boman	0.35 s	Kotlin	2021-07-21 23:44:11
3	Emil Wihlander	0.39 s	Kotlin	2023-07-28 15:51:15
4	Bradley Richards	0.39 s	Kotlin	2025-03-20 16:16:42
5	Adam Rankin	0.42 s	Kotlin	2023-04-27 19:21:15
6	Roger Bongers	0.43 s	Kotlin	2021-06-27 02:39:39
7	Troy Warmboe	0.43 s	Kotlin	2023-04-12 02:06:56
8	Ola Sundell	0.44 s	Kotlin	2023-09-08 18:15:23
9	Sergey Jakobsen	0.46 s	Kotlin	2021-09-14 17:57:47

#	User	Runtime	Language	Date
1	Cian Ruane	0.01 s	OCaml	2020-11-20 13:32:34

#	User	Runtime	Language	Date
1	Renate Fiala-Lundström	0.02 s	PHP	2023-07-28 22:54:25

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.06 s	Prolog	2023-02-12 11:25:25

#	User	Runtime	Language	Date
1	Yanmarshus Bachtiar	0.04 s	Python 2	2020-11-19 01:00:43
2	Cian Ruane	0.04 s	Python 2	2020-11-20 13:38:24
3	Thomas Feld	0.04 s	Python 2	2021-05-21 08:34:09
4	Andrei Stoica	0.04 s	Python 2	2021-09-13 23:01:40
5	Hasan Kalzi	0.04 s	Python 2	2022-06-17 16:35:12
6	Agis Daniels	0.05 s	Python 2	2021-12-11 11:26:37
7	Gibransyah	0.05 s	Python 2	2022-03-15 10:12:11
8	Johan Lyts	0.05 s	Python 2	2022-12-26 22:00:17
9	Balamurugan M	0.05 s	Python 2	2023-07-04 17:03:21
10	KALAJAYANTHI M	0.09 s	Python 2	2025-11-12 10:51:56

#	User	Runtime	Language	Date
1	Tan Yu Wei	0.05 s	Python 3	2024-10-02 10:24:28
2	Rebecca Jackson	0.05 s	Python 3	2024-12-27 22:18:09
3	Jarod Whiting	0.05 s	Python 3	2025-03-22 19:47:18
4	Wang Meiyi	0.05 s	Python 3	2025-04-25 09:16:34
5	Jiaming Kong	0.05 s	Python 3	2025-07-06 04:20:52
6	ro011110ot	0.05 s	Python 3	2025-08-07 15:11:24
7	Milton King	0.05 s	Python 3	2025-11-28 20:45:04
8	황종서/AI·소프트웨어학부(소프트웨어전공)	0.05 s	Python 3	2025-12-03 01:34:04
9	Hidden user	0.05 s	Python 3	2026-02-13 17:42:51
10	gulinazha	0.05 s	Python 3	2026-03-09 06:57:48

#	User	Runtime	Language	Date
1	Thomas Feld	0.07 s	Ruby	2023-02-28 14:34:40
2	Kok Dith	0.08 s	Ruby	2021-08-26 05:27:27

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2024-08-18 19:03:39
2	Eric Pinter	0.01 s	Rust	2021-07-02 03:10:31
3	Bas Dirks	0.01 s	Rust	2022-01-08 19:22:59
4	Freek van Keulen	0.01 s	Rust	2022-10-03 17:44:35
5	David Rasch	0.01 s	Rust	2024-01-08 15:32:30
6	Pankajkumar Patro	0.01 s	Rust	2024-09-27 16:12:41
7	Isak Jägberg	0.01 s	Rust	2024-10-18 22:23:08
8	Emil Dichmann	0.01 s	Rust	2025-10-05 08:52:39

#	User	Runtime	Language	Date
1	Ahmed Waseem Saeed	0.06 s	Swift	2024-06-18 16:03:52

#	User	Length	Language	Date
1	Danny Robinson	50	Bash	2023-10-31 14:43:38
2	Chenzhang Hu	50	Bash	2025-09-12 21:29:54

#	User	Length	Language	Date
1	Mirel Cosulschi	1246	C	2024-07-24 18:37:58
2	Sami Al Chalati	1755	C	2024-12-01 19:37:47
3	Julian Duniec	2100	C	2023-09-18 13:57:08
4	Anton Siderud	2295	C	2023-03-05 16:37:44
5	Bergur Snorrason	2322	C	2020-11-18 12:38:56
6	Jacob Sutton	3273	C	2021-01-06 03:52:52

#	User	Length	Language	Date
1	Gregory Sinclair	341	C#	2023-12-06 00:16:29
2	traxex	410	C#	2024-05-27 08:01:23
3	Benjamin Iserman	842	C#	2021-10-28 02:15:07
4	Göran Andersson	842	C#	2022-05-19 21:06:06
5	Michael Damsgaard	936	C#	2024-11-28 20:19:33
6	Eric Weiss	952	C#	2022-09-09 17:21:44
7	Benjamin Bilbeau	1025	C#	2024-08-20 21:19:23
8	Lars-Håkon Nystad	1046	C#	2021-02-23 01:02:19
9	Asbjørn Engås	1055	C#	2021-02-24 19:23:01
10	Jon Vegard Jansen	1119	C#	2021-02-22 11:32:07

#	User	Length	Language	Date
1	Chuah Wan Juin	299	C++	2022-10-20 14:52:20
2	Andrew Roberts	310	C++	2022-11-26 07:59:40
3	Nixon Widjaja	316	C++	2022-10-20 11:19:06
4	Jesús Pacheco Alonso	327	C++	2025-02-28 08:37:59
5	Christian Yongwhan Lim	332	C++	2023-05-25 00:45:41
6	Frederick Pek	335	C++	2021-06-15 07:06:24
7	Mohsen Dehbashi	336	C++	2022-02-02 21:44:14
8	Bernhard Kartefla	336	C++	2023-09-25 12:03:02
9	Gabriel Stanculescu	347	C++	2021-09-26 16:47:22
10	Samuel Tan	347	C++	2022-12-19 14:39:42

#	User	Length	Language	Date
1	Oisín Mac Fhearaí	136	Crystal	2024-08-29 10:56:04

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1195	F#	2022-10-15 09:21:16

#	User	Length	Language	Date
1	Kaleb Petersen	632	Go	2025-03-22 18:37:14
2	Adam Kjærsgaard Nielsen	779	Go	2024-08-27 11:10:32
3	Jack Kryger Sørensen	849	Go	2021-11-04 09:46:01
4	Jahid Hasan Imon	881	Go	2022-11-23 08:08:43
5	Norbert Voelker	951	Go	2021-05-14 18:29:04
6	Daniel Agatan	1067	Go	2025-02-24 17:04:41
7	Yitian Wang	1292	Go	2023-03-09 11:13:25
8	Resa Renaldy	1297	Go	2021-08-03 10:37:16

#	User	Length	Language	Date
1	Øyvind Almli	383	Haskell	2022-11-18 08:14:03
2	Jan Hrček	393	Haskell	2021-03-21 13:14:13
3	Steinar Simonnes	482	Haskell	2024-02-02 16:00:34
4	Ng Tek In	500	Haskell	2022-08-18 08:32:26
5	Sebastian Banert	605	Haskell	2024-07-21 18:57:04
6	Brian Hwang	770	Haskell	2024-05-14 22:25:20
7	Hidden user	956	Haskell	2023-01-03 11:36:14
8	Brent Yorgey	1273	Haskell	2020-11-20 23:49:38
9	Hidden user	10919	Haskell	2021-05-30 13:04:02

#	User	Length	Language	Date
1	Josh Henderson	463	Java	2021-04-08 00:31:30
2	Zach Tschetter	469	Java	2021-04-05 16:06:36
3	Thanh Le	510	Java	2022-12-22 21:39:16
4	Justin Yang	593	Java	2023-01-03 19:07:27
5	Jason Liu	596	Java	2023-05-28 02:59:03
6	Yadunand Prem	653	Java	2023-10-16 05:14:35
7	Ernest Ng Zi Xuan	677	Java	2024-10-14 09:47:14
8	Hunter Mullen	684	Java	2025-02-09 03:46:57
9	Megan Low	687	Java	2024-10-23 21:52:39
10	Marshall D Feng	689	Java	2022-02-04 16:56:29

#	User	Length	Language	Date
1	Jira Angel	687	JavaScript (Node.js)	2021-04-15 06:11:11
2	Hidden user	853	JavaScript (Node.js)	2023-08-31 18:05:20

#	User	Length	Language	Date
1	Jimmy Gustafsson	184	JavaScript (SpiderMonkey)	2024-07-08 20:47:21
2	Christian Pilegaard Cederquist	266	JavaScript (SpiderMonkey)	2023-01-15 14:40:09
3	Bjørn Chr. Soltvedt	436	JavaScript (SpiderMonkey)	2020-12-03 08:54:00
4	Peter Menyes	488	JavaScript (SpiderMonkey)	2021-10-12 21:04:59
5	Zach Tschetter	659	JavaScript (SpiderMonkey)	2023-06-22 00:27:32

#	User	Length	Language	Date
1	Danny Robinson	128	Julia	2023-10-31 14:17:08
2	Timothy Gaede	603	Julia	2024-04-17 02:32:45

#	User	Length	Language	Date
1	Roger Bongers	446	Kotlin	2021-06-27 02:39:39
2	Emil Wihlander	454	Kotlin	2023-07-28 15:51:15
3	Adam Rankin	475	Kotlin	2023-04-27 19:21:15
4	Troy Warmboe	517	Kotlin	2023-04-12 02:06:56
5	Sergey Jakobsen	597	Kotlin	2021-09-14 17:57:47
6	Bradley Richards	664	Kotlin	2025-03-20 16:16:42
7	Ola Sundell	709	Kotlin	2023-09-08 18:15:23
8	Erik Boman	775	Kotlin	2021-07-21 23:44:11
9	Martijn Muijsers	806	Kotlin	2024-05-31 12:23:23

#	User	Length	Language	Date
1	Cian Ruane	1037	OCaml	2020-11-20 13:32:34

#	User	Length	Language	Date
1	Renate Fiala-Lundström	472	PHP	2023-07-28 22:54:25

#	User	Length	Language	Date
1	Hakan Kjellerstrand	359	Prolog	2023-02-12 11:25:25

#	User	Length	Language	Date
1	Thomas Feld	179	Python 2	2021-05-21 08:34:09
2	Johan Lyts	218	Python 2	2022-12-26 22:00:17
3	Yanmarshus Bachtiar	287	Python 2	2020-11-19 01:00:43
4	Cian Ruane	308	Python 2	2020-11-20 13:38:24
5	Gibransyah	455	Python 2	2022-03-15 10:12:11
6	Andrei Stoica	466	Python 2	2021-09-13 23:01:40
7	Agis Daniels	488	Python 2	2021-12-11 11:26:37
8	Hasan Kalzi	714	Python 2	2021-06-25 16:18:37
9	Balamurugan M	714	Python 2	2023-07-04 17:03:21
10	KALAJAYANTHI M	792	Python 2	2025-11-12 10:51:56

#	User	Length	Language	Date
1	Clement Oh	112	Python 3	2023-07-13 19:28:42
2	Wouter Dijkstra	138	Python 3	2022-11-17 08:18:30
3	Si Jie Tan	138	Python 3	2026-01-14 10:41:23
4	Ahmed Chamseddine	157	Python 3	2024-07-16 16:37:24
5	Artur Khuziakhmetov	159	Python 3	2025-03-05 09:13:53
6	Shashank Bhatt	169	Python 3	2024-07-23 06:11:40
7	Seyed Mohammad Seyedi	175	Python 3	2025-05-17 19:25:27
8	David Aldenbro	177	Python 3	2025-02-25 16:27:30
9	David Skocic	183	Python 3	2024-10-18 02:55:47
10	ACMCSU	183	Python 3	2024-10-18 02:56:11

#	User	Length	Language	Date
1	Thomas Feld	59	Ruby	2023-02-28 14:35:54
2	Kok Dith	240	Ruby	2021-08-26 05:27:27

#	User	Length	Language	Date
1	Emil Dichmann	596	Rust	2025-10-05 08:52:39
2	Bas Dirks	645	Rust	2022-01-08 19:22:59
3	David Rasch	745	Rust	2024-01-08 15:32:30
4	Freek van Keulen	748	Rust	2022-10-03 17:44:35
5	Pankajkumar Patro	867	Rust	2024-09-27 16:12:41
6	Isak Jägberg	1004	Rust	2024-10-18 22:23:08
7	Eric Pinter	1169	Rust	2021-07-02 03:10:31
8	Vincent Lagerros	17249	Rust	2024-08-18 19:03:39

#	User	Length	Language	Date
1	Ahmed Waseem Saeed	526	Swift	2024-06-18 16:03:52

Solution running time distribution