Problem A
Firefly — Problem Statistics

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Submissions	8377
Accepted submissions	3392
Submission ratio	40.49%
Authors	2910
Full solves [?]	2433
Full solve Ratio	83.61%

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.01 s	C	2023-01-26 09:38:43
2	Jose Miguel Leyesa	0.02 s	C	2019-09-24 16:12:24
3	Christianne Marie Vinco	0.02 s	C	2019-09-28 05:46:26
4	Julian Rafael Sunpayco	0.02 s	C	2019-10-02 12:25:50
5	Pim Heeman	0.02 s	C	2020-02-19 23:45:33
6	Hidden user	0.02 s	C	2020-07-20 14:24:36
7	Kyle Isaac Tagle	0.02 s	C	2020-07-24 18:14:58
8	username	0.02 s	C	2021-01-03 14:06:31
9	pengin	0.02 s	C	2021-06-08 13:42:00
10	Ching Chang	0.02 s	C	2022-07-10 09:38:05

#	User	Runtime	Language	Date
1	traxex	0.07 s	C#	2024-05-06 17:14:25
2	Edvard Kallas	0.08 s	C#	2024-09-18 16:49:46
3	Martha Läänemägi	0.08 s	C#	2024-09-19 12:55:59
4	Liisi Kask	0.08 s	C#	2024-09-19 14:01:21
5	Kevin Eriksson	0.08 s	C#	2024-09-26 21:10:59
6	Fredrik Baldhagen	0.08 s	C#	2024-10-06 01:38:38
7	Erik van Holland	0.10 s	C#	2019-09-19 14:33:04
8	Frankie Chen	0.10 s	C#	2020-02-08 00:21:21
9	Lukas P.	0.11 s	C#	2026-03-05 18:33:11
10	Apurav Khare	0.12 s	C#	2021-10-27 00:00:13

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	C++	2018-08-12 05:10:15
2	Nathan Mandell	0.01 s	C++	2019-02-23 00:12:41
3	Agis Daniels	0.01 s	C++	2019-05-02 17:21:40
4	Ethan Dickey	0.01 s	C++	2022-02-18 08:19:14
5	Yu-Chen Chan	0.01 s	C++	2024-02-06 04:05:58
6	Leif Eriksson	0.01 s	C++	2025-02-14 12:02:36
7	Johannes Olegård	0.02 s	C++	2016-09-23 13:54:29
8	Lars Hummelgren	0.02 s	C++	2016-09-23 20:33:20
9	Fredrik Präntare	0.02 s	C++	2017-02-09 00:11:56
10	David Berard	0.02 s	C++	2017-04-28 18:53:50

#	User	Runtime	Language	Date
1	Hidden user	0.24 s	Common Lisp	2019-07-30 02:20:35

#	User	Runtime	Language	Date
1	dick move	0.05 s	Crystal	2025-09-28 19:20:20

#	User	Runtime	Language	Date
1	Josh Howard	0.03 s	Go	2026-02-17 05:45:44
2	Norbert Voelker	0.13 s	Go	2022-02-20 17:57:19
3	Miguel Martinez	0.51 s	Go	2019-07-27 11:50:13

#	User	Runtime	Language	Date
1	Hidden user	0.10 s	Haskell	2022-08-29 17:07:43
2	Steinar Simonnes	0.56 s	Haskell	2024-10-21 21:26:28
3	Mikail Khan	0.58 s	Haskell	2022-02-16 21:49:42

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.08 s	Java	2022-04-02 13:45:42
2	Leon Wang	0.08 s	Java	2024-10-02 14:51:39
3	Fabian Terh	0.09 s	Java	2018-10-30 07:30:10
4	Bjørn Dons	0.09 s	Java	2018-11-06 04:17:24
5	Samuel Klingström	0.09 s	Java	2018-11-14 22:25:53
6	Eugene Foo	0.10 s	Java	2018-11-15 19:49:42
7	Crystal Sharpe	0.10 s	Java	2021-03-03 21:36:06
8	Daniel Kun Zhang	0.10 s	Java	2025-03-05 23:06:23
9	William Fiset	0.11 s	Java	2016-09-25 15:09:23
10	José Vander Meulen	0.11 s	Java	2018-10-20 09:20:50

#	User	Runtime	Language	Date
1	Jiaxun Wei	0.43 s	JavaScript (Node.js)	2024-12-03 04:25:45
2	Jiaxun Wei	0.46 s	JavaScript (Node.js)	2024-12-03 04:20:45

#	User	Runtime	Language	Date
1	Christopher Walther	0.13 s	JavaScript (SpiderMonkey)	2021-05-01 00:01:41
2	Bjørn Chr. Soltvedt	0.15 s	JavaScript (SpiderMonkey)	2024-10-10 13:14:30
3	Christian Pilegaard Cederquist	0.24 s	JavaScript (SpiderMonkey)	2023-03-31 12:13:00

#	User	Runtime	Language	Date
1	Juan Miguel Vilar	0.44 s	Kotlin	2020-11-11 18:42:06
2	Nico Metger	0.44 s	Kotlin	2021-11-18 11:53:28
3	Adam Rankin	0.45 s	Kotlin	2023-11-10 01:12:38
4	Silas Lenz	0.61 s	Kotlin	2019-02-14 15:15:38
5	Benjamin Ye	0.65 s	Kotlin	2023-01-25 05:15:27

#	User	Runtime	Language	Date
1	Maj Stenmark	0.06 s	Python 2	2019-10-03 22:04:35
2	Juliang Li	0.07 s	Python 2	2018-03-02 23:51:26
3	Agis Daniels	0.08 s	Python 2	2020-03-24 17:25:33
4	Jacob Stringer	0.10 s	Python 2	2017-08-23 03:26:07
5	Johan Lyts	0.11 s	Python 2	2020-08-14 21:56:30
6	Yanmarshus Bachtiar	0.13 s	Python 2	2020-09-21 05:46:24
7	Andreas Björklund	0.15 s	Python 2	2020-11-02 21:40:32
8	Seyoon Ragavan	0.17 s	Python 2	2018-10-20 18:19:41
9	Philemon Linossier	0.32 s	Python 2	2025-09-16 14:39:05
10	Nishka Awasthi	0.35 s	Python 2	2022-09-18 11:36:28

#	User	Runtime	Language	Date
1	Petr	0.07 s	Python 3	2025-10-27 22:42:23
2	crapcode	0.08 s	Python 3	2023-03-16 20:57:11
3	Daniel Milišnikov	0.08 s	Python 3	2024-09-19 21:28:53
4	Harry Zhang	0.08 s	Python 3	2024-12-07 18:20:19
5	Daniel Amir	0.08 s	Python 3	2025-08-19 10:03:16
6	Matthew Curran	0.08 s	Python 3	2025-10-01 00:46:12
7	Yuan Zhang	0.08 s	Python 3	2025-12-08 00:04:22
8	Siim Tiivel	0.09 s	Python 3	2024-09-18 18:43:07
9	Lennon Shikhman	0.09 s	Python 3	2024-10-30 16:18:44
10	Elton Batista	0.09 s	Python 3	2024-10-30 20:01:37

#	User	Runtime	Language	Date
1	Yusuke Ichiki	0.29 s	Ruby	2022-05-10 07:43:44
2	Thomas Feld	0.30 s	Ruby	2023-07-07 16:03:29
3	Lucas Patten	0.33 s	Ruby	2024-07-22 19:48:07
4	Ivy Wang	0.34 s	Ruby	2023-01-27 10:36:57

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2025-05-28 22:29:24
2	Jianghua Wang	0.01 s	Rust	2023-01-25 22:08:23
3	Ryosuke Takahashi	0.01 s	Rust	2023-05-05 07:27:14
4	Joe Blower	0.01 s	Rust	2025-10-15 02:22:01
5	Iwancof	0.02 s	Rust	2023-05-07 18:02:25
6	Adam Yaser Sweilem	0.02 s	Rust	2025-02-22 11:57:56
7	Lukas Dutrieux	0.02 s	Rust	2025-10-14 23:54:16
8	Rolf Martin Glomsrud	0.03 s	Rust	2022-02-10 19:46:48
9	Bhavesh Pareek	0.03 s	Rust	2022-09-16 03:08:58
10	Adam Guangwei Yu	0.03 s	Rust	2023-01-31 21:03:26

#	User	Length	Language	Date
1	username	492	C	2021-01-03 14:06:31
2	Mirel Cosulschi	543	C	2024-03-22 11:47:37
3	pengin	609	C	2021-06-08 13:42:00
4	Nathan Leake	628	C	2018-03-03 02:22:38
5	Kyle Isaac Tagle	808	C	2020-07-24 18:14:58
6	Julian Rafael Sunpayco	816	C	2019-10-02 12:25:50
7	Jacob Stringer	867	C	2017-08-23 03:49:35
8	Ioannis Br	873	C	2023-03-08 01:41:08
9	Oskar Werkelin Ahlin	876	C	2011-01-29 21:16:01
10	Ching Chang	886	C	2022-07-10 09:38:05

#	User	Length	Language	Date
1	traxex	785	C#	2024-05-06 17:14:25
2	Martha Läänemägi	1165	C#	2024-09-19 16:36:55
3	Liisi Kask	1456	C#	2024-09-19 14:01:21
4	Fredrik Baldhagen	1471	C#	2024-10-06 01:38:38
5	Ben-Richard Ebbesvik	1506	C#	2022-04-14 12:34:16
6	Frankie Chen	1513	C#	2020-02-08 00:21:21
7	Erik van Holland	1550	C#	2019-09-19 14:33:04
8	Kevin Eriksson	1821	C#	2024-09-26 21:10:59
9	Edvard Kallas	1895	C#	2024-09-18 16:56:31
10	Lukas P.	2153	C#	2026-03-05 18:33:11

#	User	Length	Language	Date
1	Angela Qian	183	C++	2025-03-07 04:18:55
2	Michael Cheng	282	C++	2023-02-02 20:37:30
3	Yu-Chen Chan	290	C++	2024-02-06 04:23:16
4	Andrea Puddu	380	C++	2021-02-19 17:54:04
5	Simon Yu	392	C++	2023-01-31 01:57:15
6	Emmanuel Anaya	396	C++	2020-11-03 06:59:31
7	William Gan	423	C++	2018-04-17 18:55:31
8	Eduardo González	424	C++	2019-03-05 05:02:09
9	LIN MING OU XU	426	C++	2025-01-17 03:55:54
10	乃仁薛	456	C++	2020-05-01 14:50:04

#	User	Length	Language	Date
1	Hidden user	916	Common Lisp	2019-07-30 01:57:22

#	User	Length	Language	Date
1	dick move	284	Crystal	2025-09-28 19:20:20

#	User	Length	Language	Date
1	Miguel Martinez	1015	Go	2019-07-27 11:50:13
2	Norbert Voelker	1061	Go	2022-02-20 17:57:19
3	Josh Howard	1068	Go	2026-02-17 05:45:44

#	User	Length	Language	Date
1	Mikail Khan	1316	Haskell	2022-02-16 21:49:42
2	Hidden user	1336	Haskell	2022-08-29 14:46:21
3	Steinar Simonnes	1384	Haskell	2024-10-21 21:26:28

#	User	Length	Language	Date
1	Hidden user	885	Java	2022-02-17 20:52:50
2	Benito Miguel IV Flores	906	Java	2020-11-11 07:29:17
3	Ian Gonzalez	946	Java	2019-04-17 14:26:21
4	David Clutter	963	Java	2025-09-24 02:32:45
5	Charles Boole	971	Java	2019-09-25 14:58:44
6	Brian Jezreel So	971	Java	2019-09-25 14:59:33
7	Conrad Suits	972	Java	2025-09-23 00:23:09
8	Nathan Fowler	994	Java	2021-10-28 20:43:40
9	Thore Husfeldt	1022	Java	2025-02-23 11:39:27
10	Myles Russel Chan	1023	Java	2020-07-20 08:41:44

#	User	Length	Language	Date
1	Jiaxun Wei	1398	JavaScript (Node.js)	2024-12-03 04:25:45
2	Jiaxun Wei	1910	JavaScript (Node.js)	2024-12-03 04:20:45

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	330	JavaScript (SpiderMonkey)	2024-10-10 13:21:55
2	Christian Pilegaard Cederquist	653	JavaScript (SpiderMonkey)	2023-03-31 12:10:27
3	Christopher Walther	1732	JavaScript (SpiderMonkey)	2021-05-01 00:01:41

#	User	Length	Language	Date
1	Benjamin Ye	533	Kotlin	2023-01-25 05:15:27
2	Juan Miguel Vilar	750	Kotlin	2020-11-11 18:42:06
3	Adam Rankin	1104	Kotlin	2023-11-10 01:12:38
4	Nico Metger	1554	Kotlin	2021-11-18 11:53:28
5	Silas Lenz	3308	Kotlin	2019-02-14 15:15:38

#	User	Length	Language	Date
1	Maj Stenmark	322	Python 2	2019-10-03 22:00:05
2	Andreas Björklund	397	Python 2	2020-11-02 21:40:32
3	Seyoon Ragavan	489	Python 2	2018-10-20 18:19:41
4	Johan Lyts	497	Python 2	2020-08-14 21:56:30
5	Jacob Stringer	522	Python 2	2017-08-23 03:26:07
6	Agis Daniels	592	Python 2	2020-03-24 17:27:59
7	Nishka Awasthi	638	Python 2	2022-09-18 11:36:28
8	Juliang Li	762	Python 2	2018-03-02 23:51:26
9	Kuan Wei Heng	956	Python 2	2018-03-31 09:50:06
10	Yanmarshus Bachtiar	1040	Python 2	2020-09-21 05:46:24

#	User	Length	Language	Date
1	Nikolaj Munk Binder Jensen	185	Python 3	2025-02-23 08:21:39
2	Peter Jin	217	Python 3	2022-09-16 18:14:41
3	Michael Goldwasser	226	Python 3	2025-09-13 06:52:24
4	Benjamin Z White	229	Python 3	2023-04-12 22:12:49
5	Shashank Bhatt	241	Python 3	2024-07-22 19:25:27
6	Thore Husfeldt	248	Python 3	2025-02-22 20:05:21
7	David Aldenbro	248	Python 3	2025-10-13 22:47:02
8	Elijah Satrom	254	Python 3	2022-10-12 21:22:25
9	bhavin	258	Python 3	2025-03-06 08:05:57
10	Pratyanch Jain	303	Python 3	2024-02-01 07:12:40

#	User	Length	Language	Date
1	Thomas Feld	127	Ruby	2023-07-07 16:03:29
2	Lucas Patten	303	Ruby	2024-07-22 19:52:04
3	Ivy Wang	412	Ruby	2023-01-27 10:36:57
4	Yusuke Ichiki	814	Ruby	2022-05-10 07:43:44

#	User	Length	Language	Date
1	Jianghua Wang	1150	Rust	2023-01-25 22:08:23
2	Adam Yaser Sweilem	1212	Rust	2025-02-22 11:57:56
3	Lukas Dutrieux	1241	Rust	2025-10-14 23:54:16
4	Bhavesh Pareek	1384	Rust	2022-09-16 03:08:58
5	Judith Hemp	1389	Rust	2021-01-15 22:08:53
6	Adam Guangwei Yu	1534	Rust	2023-01-31 21:03:26
7	Rolf Martin Glomsrud	1834	Rust	2022-02-11 10:41:33
8	Ryan Chau	1876	Rust	2023-02-02 17:59:23
9	Tuncay Alarcin	1950	Rust	2023-11-09 19:11:24
10	Joe Blower	1962	Rust	2025-10-15 02:22:01

Solution running time distribution