Problem A
Incognito — Problem Statistics

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Submissions	3493
Accepted submissions	1702
Submission ratio	48.73%
Authors	1714
Full solves [?]	1483
Full solve Ratio	86.52%

#	User	Runtime	Language	Date
1	Bas te Kolste	0.02 s	C#	2015-07-28 14:09:21
2	Andriy Zyevakov	0.02 s	C#	2015-10-20 15:07:14
3	Patrick Nobbe	0.02 s	C#	2016-04-02 19:14:55
4	Peter Thorsen	0.02 s	C#	2016-05-01 09:03:50
5	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-06-30 20:16:26
6	Erik Flink	0.02 s	C#	2016-09-21 13:52:36
7	Michael Malkiewicz	0.02 s	C#	2016-10-16 21:04:13
8	Anej Jereb	0.02 s	C#	2016-12-12 16:08:24
9	Hidden user	0.02 s	C#	2017-01-20 23:41:37
10	Klas af Geijerstam	0.02 s	C#	2017-04-09 21:46:34

#	User	Runtime	Language	Date
1	David Cawthon	0.01 s	Common Lisp	2019-08-15 02:06:38
2	Nicholas Lantz	0.03 s	Common Lisp	2019-05-03 19:37:53

#	User	Runtime	Language	Date
1	Theodor Beskow	0.00 s	Go	2026-02-07 15:07:14
2	Hidden user	0.02 s	Go	2018-10-21 17:29:02
3	Christian Persson	0.02 s	Go	2019-10-19 14:25:32
4	Eddy Wu	0.03 s	Go	2018-12-20 09:56:54
5	Dylan Mcdougall	0.03 s	Go	2019-10-02 03:57:18
6	Norbert Voelker	0.08 s	Go	2021-08-27 22:52:52
7	Laust Brock-Nannestad	0.10 s	Go	2021-10-05 23:24:34

#	User	Runtime	Language	Date
1	Joakim Lundborg	0.00 s	Haskell	2015-09-27 11:55:03
2	Hidden user	0.00 s	Haskell	2016-04-03 15:50:57
3	Hidden user	0.00 s	Haskell	2016-07-20 02:07:11
4	Brent Yorgey	0.00 s	Haskell	2016-09-30 03:26:48
5	Johan Meier	0.00 s	Haskell	2017-01-01 11:43:34
6	Hidden user	0.00 s	Haskell	2017-05-19 13:14:53
7	Atli Fannar Franklín	0.00 s	Haskell	2017-08-22 18:05:27
8	Mattias Aronsson Adler	0.00 s	Haskell	2018-07-10 18:19:02
9	Qi Ji	0.00 s	Haskell	2018-07-11 21:01:30
10	Md Akif Chowdhury	0.00 s	Haskell	2023-06-20 06:15:34

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.04 s	Java	2025-05-16 16:44:39
2	Taras Romanyuk	0.05 s	Java	2024-09-19 23:03:26
3	Sriniketh Vangaru	0.05 s	Java	2024-09-24 00:27:12
4	Mark Meysenburg	0.05 s	Java	2025-04-24 17:20:58
5	Alvin Lee	0.05 s	Java	2025-09-26 01:43:43
6	Rene Argento	0.05 s	Java	2026-01-05 03:33:48
7	Erik Odenman	0.06 s	Java	2013-11-07 17:30:53
8	Hidden user	0.06 s	Java	2014-10-27 22:51:31
9	Jimmy Mårdell	0.06 s	Java	2014-12-23 11:18:42
10	Patrik Hörnqvist	0.06 s	Java	2015-05-30 00:59:20

#	User	Runtime	Language	Date
1	Karra Caye Santillan	0.04 s	JavaScript (Node.js)	2025-08-06 03:06:26
2	Emil Clemedson	0.42 s	JavaScript (Node.js)	2021-09-21 08:55:57

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2016-01-04 17:44:13
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-03-09 04:18:19
3	Johannes Jensen	0.01 s	JavaScript (SpiderMonkey)	2016-09-16 13:09:50
4	Michael Laszlo	0.01 s	JavaScript (SpiderMonkey)	2016-10-09 05:06:15
5	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-06-08 05:56:06
6	Subasinha Dias	0.02 s	JavaScript (SpiderMonkey)	2023-09-29 13:37:09
7	Zachary DeStefano	0.03 s	JavaScript (SpiderMonkey)	2019-09-26 23:49:55

#	User	Runtime	Language	Date
1	Timothy Gaede	0.54 s	Julia	2024-05-08 12:19:25

#	User	Runtime	Language	Date
1	Jacob Huebner	0.14 s	Kotlin	2022-03-08 01:01:42
2	Dayan Ruben Gonzalez	0.17 s	Kotlin	2020-09-30 19:23:21
3	Josie Bierbaum	0.20 s	Kotlin	2019-10-27 21:46:44
4	Adam Rankin	0.20 s	Kotlin	2023-09-14 21:51:32
5	Caden G	0.21 s	Kotlin	2019-10-27 21:49:13
6	Troy Warmboe	0.22 s	Kotlin	2018-10-19 23:25:08
7	Mohsen Dehbashi	0.25 s	Kotlin	2019-07-30 18:12:11
8	Mohamadhassan Ebrahimi	0.25 s	Kotlin	2019-11-03 10:59:06
9	Mohamma Ali Bashari movahhed	0.25 s	Kotlin	2019-11-03 11:18:49

#	User	Runtime	Language	Date
1	Joe Walbran	0.00 s	OCaml	2019-11-01 03:24:27

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2019-04-26 22:30:26

#	User	Runtime	Language	Date
1	Jesper Brodersen	0.01 s	PHP	2018-11-01 13:46:33
2	Emil Riis Hansen	0.01 s	PHP	2018-11-01 14:23:36

#	User	Runtime	Language	Date
1	Johannes Agestam	0.02 s	Python 2	2015-06-23 00:26:39
2	Sigurður Jens Albertsson	0.02 s	Python 2	2017-11-22 22:16:38
3	Patrik Lilja	0.03 s	Python 2	2015-05-20 21:29:47
4	Christofer Ohlsson	0.03 s	Python 2	2015-07-09 00:30:03
5	Thanh Do Quang	0.03 s	Python 2	2015-09-12 16:26:53
6	Asger Hautop Drewsen	0.03 s	Python 2	2016-01-27 16:20:34
7	Andrew Read-McFarland	0.03 s	Python 2	2016-02-15 20:55:02
8	Hidden user	0.03 s	Python 2	2016-02-21 21:08:36
9	Tore Norderud	0.03 s	Python 2	2016-03-12 16:54:36
10	Urban Pettersson	0.03 s	Python 2	2016-05-22 16:58:34

#	User	Runtime	Language	Date
1	James Elías Sigurðarson	0.02 s	Python 3	2015-06-15 11:39:12
2	Johannes Agestam	0.02 s	Python 3	2015-06-23 00:25:44
3	Anej Jereb	0.02 s	Python 3	2015-08-15 22:19:51
4	Damian Bemben	0.02 s	Python 3	2015-09-14 18:42:48
5	Victor Zheng	0.02 s	Python 3	2015-10-04 04:30:11
6	Adam Fazekas	0.02 s	Python 3	2015-11-15 20:07:02
7	Mikael Hedin	0.02 s	Python 3	2015-12-22 23:39:39
8	Clint Nieuwendijk	0.02 s	Python 3	2016-03-30 11:33:58
9	Magnus Thomé	0.02 s	Python 3	2016-05-03 07:01:58
10	Jack Rosenthal	0.02 s	Python 3	2016-07-18 03:47:04

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-02-04 14:53:02
2	Dylan Mcdougall	0.04 s	Ruby	2019-10-02 14:19:31
3	Hidden user	0.05 s	Ruby	2022-02-02 22:07:25
4	Thomas Feld	0.06 s	Ruby	2023-04-17 15:42:41
5	Clement Oh	0.06 s	Ruby	2023-11-20 17:42:49

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Rust	2019-03-02 20:29:36
2	Isak Jägberg	0.00 s	Rust	2019-08-24 15:16:01
3	Robert Janczewski	0.00 s	Rust	2020-02-06 13:46:01
4	Joshua Ji	0.00 s	Rust	2020-11-04 19:37:34
5	David Rasch	0.00 s	Rust	2020-11-11 12:28:17
6	Muhammad Rais Fathin Mudzakir	0.00 s	Rust	2021-06-07 00:26:35
7	Jasper Pluijmers	0.00 s	Rust	2021-10-18 16:30:00
8	Bas Dirks	0.00 s	Rust	2022-02-11 10:39:47
9	Daniel Anker Hermansen	0.00 s	Rust	2023-09-19 15:51:05
10	Vincent Lagerros	0.00 s	Rust	2024-10-12 20:47:26

#	User	Length	Language	Date
1	Ivan Petrov	599	C	2019-07-01 09:38:45
2	Nathan Agius	680	C	2023-04-19 05:18:22
3	Anton Lindroth	805	C	2021-10-16 14:37:48
4	Hidden user	893	C	2017-12-06 19:33:06
5	Matthew Johnson	905	C	2015-06-16 05:20:30
6	Oscar Andersson	987	C	2022-05-29 14:26:35
7	Mirel Cosulschi	996	C	2024-07-30 21:56:07
8	Pim Heeman	1061	C	2019-05-20 22:20:50
9	Sambit Palit	1131	C	2020-11-11 23:34:07
10	Hidden user	2403	C	2021-01-05 07:47:05

#	User	Length	Language	Date
1	Michael Malkiewicz	795	C#	2016-10-16 21:04:13
2	Armin Krauss	892	C#	2018-11-09 09:47:24
3	Jens Schmidt Hansen	971	C#	2018-10-08 16:13:15
4	Arek Swierczek	1013	C#	2020-12-04 21:10:03
5	Raja Sanjeev Kumar Nakka	1033	C#	2016-06-30 20:16:26
6	Anders Parsberg Wagner	1048	C#	2020-10-30 16:28:49
7	Bas te Kolste	1082	C#	2015-10-10 11:50:16
8	Thomas Norris	1105	C#	2019-06-22 19:04:26
9	Niklas Huss	1111	C#	2019-02-26 08:43:21
10	Mehdi Adelzadeh	1128	C#	2019-06-26 21:52:02

#	User	Length	Language	Date
1	Mathias Gernez	270	C++	2025-09-11 23:46:05
2	Zane Yu	293	C++	2019-01-04 15:05:03
3	James Tan	312	C++	2024-11-16 17:34:28
4	Shah Mohammad	315	C++	2024-10-22 11:07:04
5	SiBi	331	C++	2019-04-15 13:58:11
6	Alex Rudzenis	335	C++	2024-01-21 14:43:43
7	Zachary Polansky	339	C++	2017-05-07 03:37:48
8	Jesús Pacheco Alonso	343	C++	2025-02-10 13:48:17
9	Hidden user	345	C++	2020-02-23 12:46:52
10	Sidhant Bansal	349	C++	2018-01-13 14:34:03

#	User	Length	Language	Date
1	Nicholas Lantz	927	Common Lisp	2019-05-03 19:37:53
2	David Cawthon	977	Common Lisp	2019-08-15 02:06:38

#	User	Length	Language	Date
1	Theodor Beskow	439	Go	2026-02-07 15:07:14
2	Dylan Mcdougall	463	Go	2019-10-02 03:57:18
3	Norbert Voelker	679	Go	2021-08-27 22:52:52
4	Eddy Wu	806	Go	2018-12-20 09:56:54
5	Laust Brock-Nannestad	858	Go	2021-10-05 23:24:34
6	Hidden user	963	Go	2018-10-21 17:29:02
7	Christian Persson	1744	Go	2019-10-19 14:25:32

#	User	Length	Language	Date
1	Hidden user	198	Haskell	2016-07-20 02:19:56
2	Hidden user	372	Haskell	2017-05-19 13:25:09
3	Md Akif Chowdhury	418	Haskell	2023-06-20 06:15:34
4	Brent Yorgey	430	Haskell	2016-09-30 03:26:48
5	Albert Lai	452	Haskell	2019-10-18 23:16:07
6	Jonas Kastberg Hinrichsen	466	Haskell	2020-10-30 19:36:33
7	Rushil U	512	Haskell	2021-10-07 06:11:56
8	Atli Fannar Franklín	513	Haskell	2017-08-22 18:05:27
9	Emil Østergaard	550	Haskell	2020-10-30 18:09:11
10	Johan Meier	557	Haskell	2017-01-01 11:43:34

#	User	Length	Language	Date
1	Eric Leow Yu Quan	528	Java	2021-01-04 08:28:18
2	Kurtis Van Gent	542	Java	2016-02-16 15:38:08
3	David Joy	561	Java	2019-10-18 06:15:48
4	Amon Al-khatib	598	Java	2015-12-20 00:10:22
5	Drew Hoover	601	Java	2015-10-12 23:32:35
6	Thomas King	604	Java	2019-06-22 18:54:27
7	Benjamin Laurence Erickson	606	Java	2016-02-15 00:56:45
8	Doug Goodman	613	Java	2016-06-09 16:42:37
9	ga em	634	Java	2019-10-15 04:41:03
10	Duc Pham	634	Java	2019-10-15 04:42:02

#	User	Length	Language	Date
1	Karra Caye Santillan	328	JavaScript (Node.js)	2025-08-06 03:06:26
2	Emil Clemedson	870	JavaScript (Node.js)	2021-09-21 08:55:57

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	250	JavaScript (SpiderMonkey)	2023-06-08 05:56:06
2	Zachary DeStefano	313	JavaScript (SpiderMonkey)	2019-09-26 23:49:55
3	Bjørn Chr. Soltvedt	396	JavaScript (SpiderMonkey)	2016-03-09 04:33:20
4	Peter Kedemo	484	JavaScript (SpiderMonkey)	2016-01-04 17:44:13
5	Johannes Jensen	589	JavaScript (SpiderMonkey)	2016-09-16 13:09:50
6	Subasinha Dias	825	JavaScript (SpiderMonkey)	2023-09-29 13:37:09
7	Michael Laszlo	1056	JavaScript (SpiderMonkey)	2016-10-09 05:06:15

#	User	Length	Language	Date
1	Timothy Gaede	803	Julia	2024-05-08 12:19:25

#	User	Length	Language	Date
1	Mohamma Ali Bashari movahhed	347	Kotlin	2019-11-03 11:18:49
2	Mohamadhassan Ebrahimi	356	Kotlin	2019-11-03 10:59:06
3	Adam Rankin	367	Kotlin	2023-09-14 21:51:32
4	Mohsen Dehbashi	371	Kotlin	2019-11-02 09:27:56
5	Troy Warmboe	389	Kotlin	2018-10-19 23:37:09
6	Dayan Ruben Gonzalez	474	Kotlin	2020-09-30 19:23:21
7	Josie Bierbaum	593	Kotlin	2019-10-27 21:46:44
8	Caden G	864	Kotlin	2019-10-27 21:49:13
9	Jacob Huebner	1291	Kotlin	2022-03-08 01:01:42

#	User	Length	Language	Date
1	Joe Walbran	1161	OCaml	2019-11-01 03:24:27

#	User	Length	Language	Date
1	Ingemar Ragnemalm	970	Pascal	2019-04-26 22:30:26

#	User	Length	Language	Date
1	Jesper Brodersen	820	PHP	2018-11-01 13:46:33
2	Emil Riis Hansen	1651	PHP	2018-11-01 14:23:36

#	User	Length	Language	Date
1	Thomas Feld	171	Python 2	2019-09-06 13:45:05
2	Johan Wind	226	Python 2	2017-06-07 19:11:41
3	Lars Åström	236	Python 2	2019-06-02 22:02:03
4	Andreas Björklund	239	Python 2	2020-03-12 17:56:31
5	Guan Yang Ze	246	Python 2	2019-09-13 18:48:22
6	Justin Su	261	Python 2	2018-10-02 01:42:35
7	Thomas Vu	268	Python 2	2019-02-08 10:45:15
8	Haggai Liu	269	Python 2	2017-03-21 00:32:10
9	David Lim	270	Python 2	2017-09-27 14:23:57
10	Eoin Davey	278	Python 2	2017-09-01 15:37:38

#	User	Length	Language	Date
1	Michael Wu	139	Python 3	2025-09-26 03:15:37
2	Krish Shah	142	Python 3	2025-10-03 05:00:58
3	Charles Ancheta	143	Python 3	2023-04-15 04:39:48
4	Peter Stauder	158	Python 3	2022-10-17 20:41:42
5	Si Jie Tan	160	Python 3	2026-03-14 09:07:18
6	Ahmed Chamseddine	174	Python 3	2025-03-07 15:29:01
7	Aaruni Gupta	179	Python 3	2025-10-03 05:28:41
8	Tai Tze Kin	192	Python 3	2024-05-11 16:15:14
9	Wilbert Chu	195	Python 3	2024-11-15 22:32:05
10	Isaac Erdman	201	Python 3	2024-09-20 06:10:51

#	User	Length	Language	Date
1	Thomas Feld	79	Ruby	2023-04-17 15:43:30
2	Clement Oh	146	Ruby	2023-11-20 17:42:49
3	Casper Christensen	239	Ruby	2016-02-04 14:53:02
4	Hidden user	329	Ruby	2022-02-02 22:07:25
5	Dylan Mcdougall	465	Ruby	2019-10-02 14:19:31

#	User	Length	Language	Date
1	Bas Dirks	659	Rust	2022-02-11 10:39:47
2	David Rasch	699	Rust	2020-11-11 12:28:17
3	Jasper Pluijmers	1005	Rust	2021-10-18 16:30:00
4	Robert Janczewski	1096	Rust	2020-02-06 13:46:01
5	Joshua Ji	1116	Rust	2020-11-04 19:37:34
6	Isak Jägberg	1315	Rust	2019-08-24 15:16:01
7	Hidden user	2949	Rust	2019-03-02 20:29:36
8	Muhammad Rais Fathin Mudzakir	4167	Rust	2021-06-07 00:26:35
9	Vincent Lagerros	19675	Rust	2024-10-12 20:47:26
10	Daniel Anker Hermansen	20954	Rust	2023-09-19 15:51:05

Solution running time distribution