Problem A
Inverse Factorial — Problem Statistics

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Submissions	12711
Accepted submissions	2621
Submission ratio	20.62%
Authors	3061
Accepted authors	1799
Author ratio	58.77%

#	User	Runtime	Language	Date
1	Max NC	0.02 s	APL	2023-09-08 23:45:48

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.09 s	Bash	2024-04-16 16:34:36

#	User	Runtime	Language	Date
1	Lin Lee	0.00 s	C	2021-05-23 04:00:39
2	Sebastian Miles	0.00 s	C	2022-10-11 13:26:19
3	Isaac Saffold	0.00 s	C	2023-06-03 15:31:01
4	Hidden user	0.00 s	C	2024-11-22 13:34:58
5	Yilun Yao	0.01 s	C	2016-09-24 22:10:28
6	Steve Baker	0.01 s	C	2016-09-24 22:47:02
7	Feliho S. J. Kèfil	0.01 s	C	2016-09-30 22:49:26
8	Gbaguidi E. Hugues	0.01 s	C	2016-10-01 07:24:46
9	Adam Evans	0.01 s	C	2016-10-04 14:43:42
10	Hidden user	0.01 s	C	2016-12-22 12:21:54

#	User	Runtime	Language	Date
1	Talgat Yegizbayev	0.03 s	C#	2016-09-24 22:37:57
2	Ilia Volkov	0.03 s	C#	2016-10-30 09:46:18
3	Klas af Geijerstam	0.03 s	C#	2017-04-10 21:36:45
4	Max Nylander	0.03 s	C#	2017-04-10 21:43:11
5	Þorsteinn Þorvaldsson	0.03 s	C#	2017-06-08 00:08:11
6	Armin Krauss	0.03 s	C#	2018-11-09 11:44:38
7	Soujatya Sanyal	0.03 s	C#	2019-02-10 21:33:50
8	Nicholas Sippley	0.03 s	C#	2019-06-12 02:12:21
9	Patrik Sjölin	0.03 s	C#	2019-07-04 13:32:18
10	Jasmin Baniya	0.03 s	C#	2020-04-27 00:03:28

#	User	Runtime	Language	Date
1	Hidden user	0.08 s	Common Lisp	2019-06-22 04:54:21

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.08 s	F#	2023-08-29 19:04:08

#	User	Runtime	Language	Date
1	Eidan Cohen	0.02 s	Go	2023-01-05 19:27:38
2	Norbert Voelker	0.02 s	Go	2023-03-26 00:44:13
3	Peter Elliott	0.08 s	Go	2019-06-13 06:16:59
4	Hidden user	0.08 s	Go	2022-01-29 07:33:40

#	User	Runtime	Language	Date
1	Tim Put	0.00 s	Haskell	2019-09-14 23:33:49
2	Juan Miguel Vilar	0.01 s	Haskell	2024-06-23 16:28:10
3	Martin Jackson	0.02 s	Haskell	2017-05-08 17:59:33
4	amund lindberg	0.03 s	Haskell	2019-05-22 01:02:51
5	Esther Chong	0.12 s	Haskell	2019-01-29 08:39:58
6	Hidden user	0.13 s	Haskell	2018-10-11 00:02:16
7	Yifeng Pan	0.13 s	Haskell	2019-08-22 13:48:36
8	Johan Meier	0.14 s	Haskell	2017-01-11 23:09:31
9	Olle Eriksson	0.14 s	Haskell	2017-12-08 17:15:08
10	Leslie Yip	0.14 s	Haskell	2022-10-12 15:26:10

#	User	Runtime	Language	Date
1	John Roush	0.05 s	Java	2016-09-25 08:34:26
2	Sven Rönnbäck	0.08 s	Java	2021-11-24 18:24:23
3	Charley Sheaffer	0.09 s	Java	2016-09-29 16:44:47
4	Melvin Tan Jun Keong	0.09 s	Java	2017-03-15 23:01:08
5	Mehdi Ichou	0.09 s	Java	2017-03-28 22:35:26
6	Max Holmberg	0.09 s	Java	2017-04-14 19:25:30
7	Nguyễn Hùng Cường	0.09 s	Java	2018-09-28 09:24:45
8	Nathan Vance	0.10 s	Java	2016-09-24 20:45:46
9	Matthew Worley	0.10 s	Java	2016-09-24 20:57:31
10	Arup Ratan Guha	0.10 s	Java	2016-10-10 21:31:23

#	User	Runtime	Language	Date
1	Eugene Lim	0.02 s	JavaScript (SpiderMonkey)	2017-08-31 11:19:07
2	Nguyễn Mạnh Phúc	0.03 s	JavaScript (SpiderMonkey)	2018-09-27 10:27:08
3	Bernard Perrin	0.04 s	JavaScript (SpiderMonkey)	2019-05-17 10:47:28
4	Bjørn Chr. Soltvedt	0.04 s	JavaScript (SpiderMonkey)	2019-07-09 14:18:58
5	Christian Cederquist	0.10 s	JavaScript (SpiderMonkey)	2023-02-13 15:44:41

#	User	Runtime	Language	Date
1	Noszály Csaba	0.32 s	Julia	2025-03-25 17:42:05
2	Timothy Gaede	0.93 s	Julia	2024-07-02 12:27:21

#	User	Runtime	Language	Date
1	Jacob Huebner	0.20 s	Kotlin	2022-01-14 20:44:38
2	Adam Rankin	0.30 s	Kotlin	2023-09-14 21:17:52
3	Phường Lên	0.36 s	Kotlin	2020-03-03 07:15:38
4	Hidden user	0.36 s	Kotlin	2020-03-03 12:09:51
5	Adam Koprowski	0.36 s	Kotlin	2021-05-05 11:23:14
6	Danny Mittal	0.36 s	Kotlin	2022-09-14 05:07:45
7	Ivan Costa	0.43 s	Kotlin	2019-05-31 22:57:31
8	Jonathan Soo	0.45 s	Kotlin	2019-07-20 16:09:05

#	User	Runtime	Language	Date
1	caselhos	0.02 s	Odin	2025-07-31 23:47:56

#	User	Runtime	Language	Date
1	Ali Pandidan	0.02 s	PHP	2017-02-26 22:04:16

#	User	Runtime	Language	Date
1	Jamie Simon	0.03 s	Python 2	2016-09-24 21:20:10
2	Michael Laszlo	0.03 s	Python 2	2016-09-24 21:30:42
3	Ethan Arnold	0.03 s	Python 2	2017-10-04 03:44:29
4	Nicolas Valdiviezo	0.03 s	Python 2	2017-10-19 05:41:28
5	Nathan Leake	0.03 s	Python 2	2018-11-05 06:21:40
6	Anton van Es	0.03 s	Python 2	2018-11-10 23:26:59
7	Thomas Feld	0.03 s	Python 2	2019-08-27 13:49:29
8	Christian Mattsson	0.03 s	Python 2	2022-09-25 05:32:25
9	Bjarki Ágúst Guðmundsson	0.04 s	Python 2	2016-09-24 03:02:40
10	Lewin Gan	0.04 s	Python 2	2016-09-24 18:43:55

#	User	Runtime	Language	Date
1	Alex Damian	0.02 s	Python 3	2016-09-24 19:04:39
2	Sam Henry	0.02 s	Python 3	2016-09-24 19:54:22
3	Kyle June	0.02 s	Python 3	2016-09-26 01:51:27
4	Nathan Collins	0.02 s	Python 3	2016-09-27 22:01:23
5	Aonghus Lawlor	0.02 s	Python 3	2016-11-07 14:19:57
6	Yang Li	0.02 s	Python 3	2018-05-06 19:27:54
7	Brenten Canfield	0.02 s	Python 3	2019-02-05 02:12:23
8	Prateek Bhakta	0.02 s	Python 3	2019-03-01 00:12:27
9	Yassine Touri	0.02 s	Python 3	2019-04-03 12:06:47
10	Alexei Fedotov	0.02 s	Python 3	2019-07-04 11:05:46

#	User	Runtime	Language	Date
1	Thomas Feld	0.06 s	Ruby	2023-02-01 12:29:29
2	Hidden user	0.07 s	Ruby	2018-10-10 23:32:13
3	Terrence Naldoza	0.08 s	Ruby	2024-12-05 08:27:55
4	Vishal Mohanty	0.19 s	Ruby	2024-03-08 14:40:11

#	User	Runtime	Language	Date
1	Ole Johan Walderhaug	0.00 s	Rust	2020-12-18 00:27:43
2	Vincent Lagerros	0.00 s	Rust	2024-05-16 20:26:39
3	Stian Soltvedt	0.01 s	Rust	2019-05-16 19:10:13
4	Mathias Svensson	0.01 s	Rust	2019-10-24 10:51:46
5	Hidden user	0.01 s	Rust	2019-11-28 21:38:25
6	Albert Rise Nielsen	0.01 s	Rust	2020-11-15 02:37:53
7	Eric Pinter	0.01 s	Rust	2022-05-06 03:39:50
8	Yoeri Otten	0.01 s	Rust	2022-05-08 22:56:10
9	Artur Khuziakhmetov	0.01 s	Rust	2025-01-25 14:16:08
10	Mckinley Xie	0.01 s	Rust	2025-04-20 07:54:23

#	User	Length	Language	Date
1	Max NC	131	APL	2023-09-09 00:50:02

#	User	Length	Language	Date
1	Chenzhang Hu	5	Bash	2024-04-16 16:34:36

#	User	Length	Language	Date
1	Sebastian Miles	97	C	2022-10-11 15:07:52
2	Adam Evans	563	C	2016-10-04 14:43:42
3	Bengt Werstén	572	C	2017-07-08 18:02:24
4	Steve Baker	610	C	2016-09-24 22:47:02
5	Nora Hobæk Hovland	620	C	2019-07-04 21:50:24
6	Hidden user	640	C	2016-12-22 12:21:54
7	Gustav Hedengran	640	C	2016-12-22 12:23:40
8	Hidden user	640	C	2016-12-22 18:02:36
9	Jared Blase Sy	644	C	2021-04-26 23:41:36
10	Fernanda Nascimento	658	C	2022-12-05 03:07:37

#	User	Length	Language	Date
1	traxex	472	C#	2024-05-27 17:56:48
2	Armin Krauss	655	C#	2018-11-09 11:52:27
3	Brian Scott	714	C#	2017-09-28 06:32:30
4	Talgat Yegizbayev	795	C#	2016-09-24 22:37:57
5	Patrik Sjölin	859	C#	2019-07-04 13:32:18
6	Nicholas Sippley	884	C#	2019-06-12 02:12:21
7	Klas af Geijerstam	968	C#	2017-04-10 21:36:45
8	Ludwig Gehlsdorf	985	C#	2020-08-31 12:03:20
9	Frederik Rothe	1058	C#	2021-09-24 13:32:23
10	Jasmin Baniya	1172	C#	2020-04-27 00:03:28

#	User	Length	Language	Date
1	Peter Jin	178	C++	2023-03-21 21:40:56
2	Russell Ng	221	C++	2024-03-08 05:40:27
3	Frans Meulenbroeks	257	C++	2025-05-01 15:48:12
4	Nguyễn Huy Cường	290	C++	2022-10-23 01:00:37
5	Dua Arshad	290	C++	2025-01-07 17:30:51
6	Mohsen Hosseinpoorazar	306	C++	2022-09-15 06:55:44
7	Falah	306	C++	2023-05-28 13:34:28
8	Ali Muhammad Asad	306	C++	2023-07-31 20:12:16
9	Shariq Naiyer	306	C++	2022-05-13 11:43:29
10	Abdul Wahab	306	C++	2025-01-04 19:51:14

#	User	Length	Language	Date
1	Hidden user	634	Common Lisp	2019-06-22 04:54:21

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	708	F#	2023-08-29 19:04:08

#	User	Length	Language	Date
1	Peter Elliott	722	Go	2019-06-13 06:16:59
2	Hidden user	816	Go	2022-01-29 07:33:40
3	Eidan Cohen	1072	Go	2023-01-05 19:27:38
4	Norbert Voelker	1207	Go	2023-03-26 00:15:48

#	User	Length	Language	Date
1	Paul Wild	300	Haskell	2018-05-16 17:04:04
2	Hidden user	392	Haskell	2018-10-10 23:56:20
3	Tim Put	464	Haskell	2019-09-14 01:30:20
4	Olle Eriksson	533	Haskell	2017-12-08 17:15:08
5	Leslie Yip	549	Haskell	2022-10-12 15:26:10
6	Johan Meier	621	Haskell	2017-01-11 23:09:31
7	amund lindberg	625	Haskell	2019-05-07 20:33:39
8	Juan Miguel Vilar	672	Haskell	2024-06-23 16:28:10
9	Morten Lohne	710	Haskell	2017-10-25 01:11:41
10	Martin Jackson	787	Haskell	2017-05-07 23:37:36

#	User	Length	Language	Date
1	Shivam Dutt	474	Java	2016-09-24 19:43:16
2	Catalina T Ionescu	518	Java	2016-10-19 00:50:45
3	Caleb Clark	520	Java	2017-09-23 23:42:17
4	Hidden user	526	Java	2020-06-09 17:09:39
5	Jesse Ventura	537	Java	2016-09-24 21:18:22
6	Alex Coleman	539	Java	2016-10-10 21:15:52
7	Markus Bao	558	Java	2024-10-23 03:13:20
8	Andy Rock	565	Java	2016-09-24 19:26:49
9	Brennan Cleland	566	Java	2023-01-22 02:49:11
10	Samuel Klingström	575	Java	2017-04-01 00:27:32

#	User	Length	Language	Date
1	Christian Cederquist	208	JavaScript (SpiderMonkey)	2023-02-13 15:44:41
2	Nguyễn Mạnh Phúc	397	JavaScript (SpiderMonkey)	2018-09-27 10:27:08
3	Bjørn Chr. Soltvedt	414	JavaScript (SpiderMonkey)	2019-07-16 11:36:52
4	Bernard Perrin	424	JavaScript (SpiderMonkey)	2019-05-17 10:47:28
5	Eugene Lim	827	JavaScript (SpiderMonkey)	2017-08-31 11:19:07

#	User	Length	Language	Date
1	Noszály Csaba	274	Julia	2025-03-25 17:42:05
2	Timothy Gaede	1388	Julia	2024-07-02 12:27:21

#	User	Length	Language	Date
1	Hidden user	582	Kotlin	2020-03-03 12:09:51
2	Phường Lên	597	Kotlin	2020-03-03 07:15:38
3	Adam Koprowski	668	Kotlin	2021-05-05 11:23:14
4	Jacob Huebner	673	Kotlin	2022-01-14 20:41:43
5	Adam Rankin	688	Kotlin	2023-09-14 21:17:52
6	Danny Mittal	700	Kotlin	2022-09-14 05:07:45
7	Ivan Costa	747	Kotlin	2019-05-31 22:57:31
8	Jonathan Soo	1187	Kotlin	2019-07-20 16:09:05

#	User	Length	Language	Date
1	caselhos	1374	Odin	2025-07-31 23:47:56

#	User	Length	Language	Date
1	Ali Pandidan	350	PHP	2017-02-26 22:04:16

#	User	Length	Language	Date
1	Christian Mattsson	141	Python 2	2022-09-25 05:32:25
2	Alex Dai	155	Python 2	2016-09-24 20:52:13
3	Wen Li Looi	224	Python 2	2016-09-24 21:01:37
4	Matt Bonsall	251	Python 2	2016-11-01 16:06:29
5	Thomas Feld	257	Python 2	2019-08-27 13:49:29
6	Zebediah Figura	264	Python 2	2016-09-24 20:48:35
7	David Nilsson	269	Python 2	2019-03-19 19:01:26
8	Justin Su	270	Python 2	2019-10-03 15:11:52
9	Vifill Sverrisson	273	Python 2	2018-10-03 01:50:53
10	Kuan Wei Heng	277	Python 2	2017-09-28 04:58:29

#	User	Length	Language	Date
1	Vishal Mohanty	82	Python 3	2024-03-08 14:25:36
2	Christian Mattsson	85	Python 3	2022-10-11 06:09:51
3	Gustav Kalander	96	Python 3	2022-10-11 01:44:59
4	Sebastian Miles	98	Python 3	2022-10-11 01:50:17
5	Ole Vik Lysne	100	Python 3	2025-05-23 14:25:10
6	Guk Yi Siong	111	Python 3	2024-01-29 17:36:06
7	Russell Ng	111	Python 3	2024-03-08 05:37:58
8	Hao Ye	112	Python 3	2024-04-10 18:12:38
9	Benjamin Lienard	115	Python 3	2024-03-31 01:36:14
10	Thomas Feld	117	Python 3	2023-02-01 13:10:14

#	User	Length	Language	Date
1	Vishal Mohanty	70	Ruby	2024-03-08 15:37:11
2	Thomas Feld	72	Ruby	2023-02-16 08:44:18
3	Hidden user	244	Ruby	2018-10-10 23:32:13
4	Terrence Naldoza	667	Ruby	2024-11-26 01:18:57

#	User	Length	Language	Date
1	Artur Khuziakhmetov	520	Rust	2025-01-25 14:16:08
2	Vincent Lagerros	560	Rust	2024-05-16 20:15:27
3	Mathias Svensson	646	Rust	2019-10-24 10:51:46
4	Albert Rise Nielsen	861	Rust	2020-11-15 02:37:53
5	Hidden user	1005	Rust	2019-11-28 22:08:09
6	Stian Soltvedt	1031	Rust	2019-05-16 19:10:13
7	Benjamin Kaufmann	1369	Rust	2019-06-12 10:07:36
8	Eric Pinter	1396	Rust	2022-05-06 03:39:50
9	Mckinley Xie	1462	Rust	2025-04-20 07:54:23
10	Ole Johan Walderhaug	2165	Rust	2020-12-18 00:27:43

Solution running time distribution