Problem A
Class Photo — Problem Statistics

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Submissions	893
Accepted submissions	686
Submission ratio	76.82%
Authors	647
Full solves [?]	639
Full solve Ratio	98.76%

#	User	Runtime	Language	Date
1	Matzuka	0.01 s	APL	2025-09-01 13:46:40
2	Simon Baeckelant	0.01 s	APL	2025-10-15 20:18:21

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2025-09-07 23:05:39
2	Chenzhang Hu	0.01 s	Bash	2025-09-12 15:26:03

#	User	Runtime	Language	Date
1	Deci Bel	0.04 s	C#	2025-08-15 23:24:38
2	Dennis Stegnell	0.04 s	C#	2025-08-27 18:36:37
3	Henrik Hallbert	0.04 s	C#	2025-09-01 09:22:22
4	Nicholas Hood	0.04 s	C#	2025-09-02 01:44:37
5	Freek van Keulen	0.04 s	C#	2025-09-03 16:05:55
6	Aditya Bhagavatula	0.04 s	C#	2025-09-07 01:34:34
7	Cory Kalm	0.04 s	C#	2025-09-29 14:36:40
8	Hasan Eldelbani	0.04 s	C#	2025-11-06 16:59:21

#	User	Runtime	Language	Date
1	John Hershey	0.01 s	Common Lisp	2025-09-02 17:39:13

#	User	Runtime	Language	Date
1	dick move	0.00 s	Crystal	2025-10-28 19:16:42

#	User	Runtime	Language	Date
1	Magnus Baasch Langkilde	0.33 s	Erlang	2025-10-21 14:50:03

#	User	Runtime	Language	Date
1	Norbert Voelker	0.00 s	Go	2025-08-31 20:35:10
2	Carla Mathilde Køhlert Moos	0.00 s	Go	2025-09-19 16:36:54
3	Hidden user	0.00 s	Go	2025-09-19 17:14:53
4	Hidden user	0.00 s	Go	2025-10-09 18:34:36
5	Yafet Seyoum	0.00 s	Go	2025-11-01 22:34:25

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.00 s	Haskell	2025-08-23 17:58:40
2	Brent Yorgey	0.00 s	Haskell	2025-08-28 04:48:21
3	Juan Miguel Vilar	0.00 s	Haskell	2025-09-05 16:10:44
4	C D	0.00 s	Haskell	2025-09-14 04:12:28
5	Emil Boesgaard Nørbjerg	0.00 s	Haskell	2025-09-19 17:11:07
6	Pathompong Kwangtong	0.00 s	Haskell	2025-10-01 06:53:30
7	Fabian Mitterwallner	0.00 s	Haskell	2025-10-23 15:34:34
8	Herdi Saleh	0.00 s	Haskell	2025-10-27 09:15:15

#	User	Runtime	Language	Date
1	Min Chang	0.04 s	Java	2025-04-26 18:02:15
2	Guangyi Zhou	0.04 s	Java	2025-08-24 16:18:47
3	Christian Dam	0.04 s	Java	2025-09-19 16:25:04
4	Sean Pettas	0.04 s	Java	2025-09-19 16:27:23
5	Markus Bao	0.04 s	Java	2025-09-29 06:07:17
6	Markus	0.04 s	Java	2025-10-17 22:44:06
7	Yujin Yang	0.08 s	Java	2025-04-26 18:03:34
8	Sam Rojas	0.08 s	Java	2025-04-26 18:07:26
9	Isaac Carman	0.08 s	Java	2025-04-26 18:15:40
10	Hidden user	0.08 s	Java	2025-04-26 18:50:11

#	User	Runtime	Language	Date
1	Erlend Raa Vågset	0.04 s	JavaScript (Node.js)	2025-10-02 15:00:46
2	Gunnar Salbu	0.05 s	JavaScript (Node.js)	2025-10-10 12:43:38

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2025-08-13 09:13:03
2	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2025-08-14 07:31:07
3	Ben Armstrong	0.02 s	JavaScript (SpiderMonkey)	2025-08-18 17:05:10
4	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2025-09-03 11:14:17

#	User	Runtime	Language	Date
1	Timothy Gaede	0.38 s	Julia	2025-08-13 09:15:46

#	User	Runtime	Language	Date
1	Zeheng Li	0.00 s	Lua	2025-08-14 06:59:03
2	Kelium Jojoa	0.00 s	Lua	2025-11-04 17:02:11

#	User	Runtime	Language	Date
1	Alfred Morgan	0.00 s	Nim	2025-10-24 08:36:47

#	User	Runtime	Language	Date
1	Martha Kosa	0.00 s	OCaml	2025-11-06 22:48:33

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2025-09-07 07:24:41

#	User	Runtime	Language	Date
1	Thomas Feld	0.00 s	Perl	2025-08-19 12:57:49
2	Chenzhang Hu	0.00 s	Perl	2025-09-23 18:51:37
3	J Sotomayor	0.00 s	Perl	2025-11-05 22:05:32

#	User	Runtime	Language	Date
1	KALAJAYANTHI M	0.07 s	Python 2	2025-09-22 20:10:14
2	Gunnsteinn Þór Ólason	0.07 s	Python 2	2025-11-04 14:20:25

#	User	Runtime	Language	Date
1	Viktor Gustafsson	0.04 s	Python 3	2025-04-26 18:00:37
2	Alvin Ao	0.04 s	Python 3	2025-04-26 18:01:18
3	Cody O'Brien	0.04 s	Python 3	2025-04-26 18:03:40
4	Aiden Lee	0.04 s	Python 3	2025-04-26 18:04:35
5	Thomas Dixon	0.04 s	Python 3	2025-04-26 18:05:01
6	Samuel Hoeft	0.04 s	Python 3	2025-04-26 18:05:16
7	Carter Moore	0.04 s	Python 3	2025-04-26 18:15:47
8	Alexander Grooms	0.04 s	Python 3	2025-04-26 18:16:00
9	Mack Wong Yoong Yee	0.04 s	Python 3	2025-08-13 07:13:10
10	Jason Clarke	0.04 s	Python 3	2025-08-13 12:32:01

#	User	Runtime	Language	Date
1	Ayush Biswas	0.38 s	Racket	2025-10-29 09:22:30

#	User	Runtime	Language	Date
1	Alexander Bilde Pedersen	0.06 s	Ruby	2025-09-19 16:16:26
2	Frederik Petersen	0.06 s	Ruby	2025-09-19 16:18:06
3	Russell Ng	0.06 s	Ruby	2025-09-20 23:14:23
4	Þorsteinn Sævar Kristjánsson	0.06 s	Ruby	2025-10-01 18:43:56
5	Thomas Feld	0.07 s	Ruby	2025-08-19 12:58:24

#	User	Runtime	Language	Date
1	Cezary Dąbek	0.05 s	TypeScript	2025-09-09 17:09:59

#	User	Runtime	Language	Date
1	Ștefan-Iulian Alecu	0.04 s	Visual Basic	2025-11-02 05:20:11

#	User	Runtime	Language	Date
1	Grettir Heimisson	0.00 s	Zig	2025-10-20 23:32:49

#	User	Length	Language	Date
1	Matzuka	14	APL	2025-09-01 13:47:46
2	Simon Baeckelant	14	APL	2025-10-15 20:19:06

#	User	Length	Language	Date
1	Chenzhang Hu	17	Bash	2025-09-12 15:26:03
2	Danny Robinson	24	Bash	2025-09-07 23:05:39

#	User	Length	Language	Date
1	Jonatan Altebro	75	C	2025-09-01 16:49:45
2	Martin Blom	75	C	2025-09-24 09:53:34
3	Finn Uddling	92	C	2025-09-30 18:52:56
4	Eyleifur Bjarkason	99	C	2025-10-10 18:33:43
5	Sebastian Banert	101	C	2025-08-22 20:38:39
6	Sven Rönnbäck	106	C	2025-08-15 18:18:53
7	Ankam Vinuthna	110	C	2025-10-21 11:07:43
8	Mikkel Cornelius	113	C	2025-09-19 16:34:40
9	Caleb Kraglund	114	C	2025-10-06 17:35:54
10	Alexandros Hadjipaschalis	117	C	2025-10-07 15:10:28

#	User	Length	Language	Date
1	Henrik Hallbert	92	C#	2025-09-01 09:24:33
2	Deci Bel	122	C#	2025-08-15 23:24:38
3	Freek van Keulen	122	C#	2025-09-03 16:05:55
4	Aditya Bhagavatula	179	C#	2025-09-07 01:34:34
5	Hasan Eldelbani	292	C#	2025-11-06 16:59:21
6	Cory Kalm	330	C#	2025-09-29 14:36:40
7	Nicholas Hood	359	C#	2025-09-02 01:44:37
8	Dennis Stegnell	596	C#	2025-08-27 18:36:37

#	User	Length	Language	Date
1	Hidden user	79	C++	2025-08-15 10:09:36
2	Le Hoang Vu	92	C++	2025-09-26 14:45:02
3	Mathias Gernez	93	C++	2025-10-09 17:20:06
4	Constantin Ungureanu	96	C++	2025-10-02 11:59:57
5	Pablo De la Peña	97	C++	2025-11-04 06:56:31
6	Armen Andreasyan	100	C++	2025-08-19 12:53:54
7	Dustin R	101	C++	2025-08-14 04:08:32
8	PUTI SYAFIRA RASYIDAH NIZAR	101	C++	2025-10-12 00:10:37
9	Alfredo Alexander Mejia Merino	101	C++	2025-10-26 17:04:41
10	Tanner Dewit	102	C++	2025-10-12 06:40:40

#	User	Length	Language	Date
1	John Hershey	22	Common Lisp	2025-09-02 17:39:13

#	User	Length	Language	Date
1	dick move	49	Crystal	2025-10-28 19:16:42

#	User	Length	Language	Date
1	Magnus Baasch Langkilde	238	Erlang	2025-10-21 14:50:03

#	User	Length	Language	Date
1	Hidden user	105	Go	2025-10-09 18:34:36
2	Norbert Voelker	127	Go	2025-08-31 20:35:10
3	Yafet Seyoum	139	Go	2025-11-01 22:34:25
4	Carla Mathilde Køhlert Moos	183	Go	2025-09-19 16:36:54
5	Hidden user	205	Go	2025-09-19 17:14:53

#	User	Length	Language	Date
1	Fabian Mitterwallner	33	Haskell	2025-10-23 15:34:34
2	Juan Miguel Vilar	41	Haskell	2025-09-05 16:10:44
3	Herdi Saleh	41	Haskell	2025-10-27 09:15:15
4	Steinar Simonnes	89	Haskell	2025-08-23 17:58:40
5	Pathompong Kwangtong	107	Haskell	2025-10-01 06:53:30
6	C D	111	Haskell	2025-09-14 04:12:28
7	Brent Yorgey	200	Haskell	2025-08-28 04:48:21
8	Emil Boesgaard Nørbjerg	220	Haskell	2025-09-19 17:11:07

#	User	Length	Language	Date
1	Joseph Lindsley	200	Java	2025-08-28 04:58:03
2	Keynt Harly Adol	209	Java	2025-10-03 20:52:26
3	Aiman Fariz Zaqwan Bin Akmal Hizam	212	Java	2025-09-19 17:56:14
4	Hidden user	213	Java	2025-09-19 16:36:53
5	Ranjith M	213	Java	2025-10-02 04:26:39
6	Thomas Anung Basuki	216	Java	2025-08-19 04:54:19
7	Emil Tejn Rasmussen	222	Java	2025-09-09 11:30:40
8	Isaac Carman	226	Java	2025-04-26 18:15:40
9	Isaac Pinder	226	Java	21:07:51
10	PAVITHRA B	228	Java	2025-10-17 10:52:35

#	User	Length	Language	Date
1	Erlend Raa Vågset	125	JavaScript (Node.js)	2025-10-02 15:00:46
2	Gunnar Salbu	212	JavaScript (Node.js)	2025-10-10 12:43:38

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	25	JavaScript (SpiderMonkey)	2025-08-14 07:31:07
2	Jimmy Gustafsson	25	JavaScript (SpiderMonkey)	2025-09-03 11:14:17
3	Bjørn Chr. Soltvedt	28	JavaScript (SpiderMonkey)	2025-08-13 09:13:26
4	Ben Armstrong	28	JavaScript (SpiderMonkey)	2025-08-18 17:05:10

#	User	Length	Language	Date
1	Timothy Gaede	90	Julia	2025-08-13 09:15:46

#	User	Length	Language	Date
1	Zeheng Li	33	Lua	2025-08-14 06:59:03
2	Kelium Jojoa	70	Lua	2025-11-04 17:02:11

#	User	Length	Language	Date
1	Alfred Morgan	93	Nim	2025-10-24 08:36:47

#	User	Length	Language	Date
1	Martha Kosa	48	OCaml	2025-11-06 22:48:33

#	User	Length	Language	Date
1	Ingemar Ragnemalm	92	Pascal	2025-09-07 07:24:41

#	User	Length	Language	Date
1	Chenzhang Hu	6	Perl	2025-09-23 18:51:37
2	Thomas Feld	6	Perl	2025-09-24 12:45:21
3	J Sotomayor	10	Perl	2025-11-05 22:05:32

#	User	Length	Language	Date
1	Gunnsteinn Þór Ólason	21	Python 2	2025-11-04 14:20:25
2	KALAJAYANTHI M	105	Python 2	2025-09-22 20:10:14

#	User	Length	Language	Date
1	Nicholas Russell Saerang	31	Python 3	2025-08-22 11:48:49
2	Guk Yi Siong	31	Python 3	2025-08-22 13:52:54
3	Daniel Bogorad	31	Python 3	2025-10-16 16:43:12
4	Mack Wong Yoong Yee	32	Python 3	2025-08-13 07:13:10
5	Jason Clarke	32	Python 3	2025-08-13 12:32:01
6	Ahmed Chamseddine	32	Python 3	2025-08-13 14:05:28
7	Simen Sørensen	32	Python 3	2025-08-13 22:35:55
8	Hidden user	32	Python 3	2025-08-13 22:44:40
9	Yong Mao	32	Python 3	2025-08-14 02:11:39
10	Ethan Lu	32	Python 3	2025-08-16 00:23:17

#	User	Length	Language	Date
1	Ayush Biswas	64	Racket	2025-10-29 09:22:30

#	User	Length	Language	Date
1	Thomas Feld	19	Ruby	2025-08-19 12:58:24
2	Alexander Bilde Pedersen	21	Ruby	2025-09-19 16:16:26
3	Frederik Petersen	21	Ruby	2025-09-19 16:18:06
4	Russell Ng	21	Ruby	2025-09-20 23:14:23
5	Þorsteinn Sævar Kristjánsson	26	Ruby	2025-10-01 18:43:56

#	User	Length	Language	Date
1	Gustav Kristensen	154	Rust	2025-09-19 16:43:45
2	Vincent Lagerros	164	Rust	2025-08-13 21:30:32
3	Pankajkumar Patro	212	Rust	2025-09-26 14:32:56
4	Nathaniel Risum	269	Rust	2025-08-22 08:49:27
5	Johannes Sigvardsen	302	Rust	2025-09-19 16:35:05
6	Emil Dichmann	304	Rust	2025-08-17 22:59:04
7	David Rasch	324	Rust	2025-08-25 16:37:16
8	Theis Per Holm	334	Rust	2025-09-19 16:25:58
9	Hans Zhao Torkelsson	393	Rust	2025-11-05 21:30:23
10	Zenon	726	Rust	2025-10-15 18:29:41

#	User	Length	Language	Date
1	Cezary Dąbek	405	TypeScript	2025-09-09 17:09:59

#	User	Length	Language	Date
1	Ștefan-Iulian Alecu	94	Visual Basic	2025-11-02 05:20:11

#	User	Length	Language	Date
1	Grettir Heimisson	887	Zig	2025-10-20 23:32:49

Solution running time distribution