Problem A
Class Photo — Problem Statistics

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Submissions	1419
Accepted submissions	1107
Submission ratio	78.01%
Authors	1052
Full solves [?]	1042
Full solve Ratio	99.05%

#	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
3	Ștefan-Iulian Alecu	0.01 s	APL	2025-11-15 13:40:06

#	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
3	Frans Meulenbroeks	0.01 s	Bash	2026-01-28 13:03:18

#	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
9	Գոռ Բաղդասարյան	0.04 s	C#	2025-11-09 18:29:28
10	Mark Nickelsen	0.04 s	C#	2025-11-09 19:12:42

#	User	Runtime	Language	Date
1	John Hershey	0.01 s	Common Lisp	2025-09-02 17:39:13
2	Kevin Gomez	0.01 s	Common Lisp	2025-11-27 00:05:44

#	User	Runtime	Language	Date
1	dick move	0.00 s	Crystal	2025-10-28 19:16:42
2	Mehrshad Kavousi	0.00 s	Crystal	2025-12-29 23:45:58

#	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
6	Christoph H	0.00 s	Go	2025-11-29 21:59:06
7	Andini Anissa	0.00 s	Go	2025-12-15 02:48:05

#	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
9	Morten Lohne	0.00 s	Haskell	2025-11-12 10:34:11
10	Lucas Scharenbroch	0.00 s	Haskell	2025-11-21 00:44:06

#	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	Lee Heng Sheng	0.04 s	Java	2025-11-08 10:46:05
8	Julius Griebel	0.04 s	Java	2026-02-23 11:17:31
9	Yujin Yang	0.08 s	Java	2025-04-26 18:03:34
10	Sam Rojas	0.08 s	Java	2025-04-26 18:07:26

#	User	Runtime	Language	Date
1	Erlend Raa Vågset	0.04 s	JavaScript (Node.js)	2025-10-02 15:00:46
2	Hidden user	0.04 s	JavaScript (Node.js)	2025-11-25 04:43:44
3	Alex Dunn	0.04 s	JavaScript (Node.js)	2025-12-13 02:48:01
4	Gunnar Salbu	0.05 s	JavaScript (Node.js)	2025-10-10 12:43:38
5	Hidden user	0.05 s	JavaScript (Node.js)	2026-02-24 13:51:05

#	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	Luka Chabot	0.20 s	Kotlin	2025-11-18 08:10:07
2	Bellameche Yanis	0.20 s	Kotlin	2025-11-18 09:59:32
3	yanis ee	0.20 s	Kotlin	2025-11-25 09:10:50
4	Adam Rankin	0.20 s	Kotlin	2026-01-11 20:53:24

#	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	Renate	0.01 s	PHP	2026-02-23 22:06:00

#	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
3	Graham Palmer	0.07 s	Python 2	2026-02-12 22:00:59

#	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	Eugen Neagoe	0.06 s	Ruby	2026-01-17 18:20:54
6	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
3	Ștefan-Iulian Alecu	14	APL	2025-11-15 13:40:06

#	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
3	Frans Meulenbroeks	25	Bash	2026-01-28 13:03:18

#	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	Anuj Kochar	103	C	2025-11-12 12:05:48
7	Sven Rönnbäck	106	C	2025-08-15 18:18:53
8	Luca Stavasius	109	C	2025-11-28 11:52:28
9	Ankam Vinuthna	110	C	2025-10-21 11:07:43
10	Mikkel Cornelius	113	C	2025-09-19 16:34:40

#	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	Tonny Abrahamsson	129	C#	2025-11-13 22:43:25
5	Sam Anderson	137	C#	2025-12-22 21:59:21
6	Գոռ Բաղդասարյան	176	C#	2025-11-09 18:29:28
7	Aditya Bhagavatula	179	C#	2025-09-07 01:34:34
8	Mark Nickelsen	190	C#	2025-11-09 19:12:42
9	William Anton Madsen	211	C#	2025-11-13 08:43:26
10	Michael Utecht	240	C#	2026-01-18 02:36:37

#	User	Length	Language	Date
1	Shiroy Sattur	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	Kerk Tai Heng	94	C++	2025-12-03 17:51:33
5	Ralf Merhof	95	C++	2026-02-21 14:12:12
6	Constantin Ungureanu	96	C++	2025-10-02 11:59:57
7	Brilliant Misalayuk	96	C++	2025-12-30 23:00:48
8	Pablo De la Peña	97	C++	2025-11-04 06:56:31
9	Niall Green	97	C++	2026-01-18 00:35:02
10	Armen Andreasyan	100	C++	2025-08-19 12:53:54

#	User	Length	Language	Date
1	John Hershey	22	Common Lisp	2025-09-02 17:39:13
2	Kevin Gomez	22	Common Lisp	2025-11-27 00:05:44

#	User	Length	Language	Date
1	Mehrshad Kavousi	44	Crystal	2025-12-29 23:45:58
2	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	Christoph H	115	Go	2025-11-29 21:59:06
3	Norbert Voelker	127	Go	2025-08-31 20:35:10
4	Andini Anissa	129	Go	2025-12-15 02:48:05
5	Yafet Seyoum	139	Go	2025-11-01 22:34:25
6	Carla Mathilde Køhlert Moos	183	Go	2025-09-19 16:36:54
7	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	Morten Lohne	73	Haskell	2025-11-12 10:34:11
5	Steinar Simonnes	89	Haskell	2025-08-23 17:58:40
6	Pathompong Kwangtong	107	Haskell	2025-10-01 06:53:30
7	C D	111	Haskell	2025-09-14 04:12:28
8	Brent Yorgey	200	Haskell	2025-08-28 04:48:21
9	Emil Boesgaard Nørbjerg	220	Haskell	2025-09-19 17:11:07
10	Lucas Scharenbroch	358	Haskell	2025-11-21 00:44:06

#	User	Length	Language	Date
1	Einar Þór Ívarsson	190	Java	2026-02-11 14:45:58
2	Benjamin W	198	Java	2025-11-09 00:17:58
3	Joseph Lindsley	200	Java	2025-08-28 04:58:03
4	Lane Braus	207	Java	2026-01-16 00:58:33
5	Keynt Harly Adol	209	Java	2025-10-03 20:52:26
6	Aiman Fariz Zaqwan Bin Akmal Hizam	212	Java	2025-09-19 17:56:14
7	Hidden user	213	Java	2025-09-19 16:36:53
8	Ranjith M	213	Java	2025-10-02 04:26:39
9	Dogsarethemagic	213	Java	2025-11-08 18:14:16
10	Cole Christy	215	Java	2025-12-03 17:56:45

#	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
3	Hidden user	348	JavaScript (Node.js)	2026-02-24 13:51:05
4	Alex Dunn	433	JavaScript (Node.js)	2025-12-13 02:48:01
5	Hidden user	485	JavaScript (Node.js)	2025-11-25 04:43:44

#	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	Bellameche Yanis	88	Kotlin	2025-11-18 09:59:32
2	yanis ee	90	Kotlin	2025-11-25 09:10:50
3	Luka Chabot	94	Kotlin	2025-11-18 08:10:07
4	Adam Rankin	107	Kotlin	2026-01-11 20:53:24

#	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	Renate	74	PHP	2026-02-23 22:06:00

#	User	Length	Language	Date
1	Gunnsteinn Þór Ólason	21	Python 2	2025-11-04 14:20:25
2	Graham Palmer	67	Python 2	2026-02-12 22:00:59
3	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	Alexandre Douard	31	Python 3	2025-11-14 17:44:57
5	Mack Wong Yoong Yee	32	Python 3	2025-08-13 07:13:10
6	Jason Clarke	32	Python 3	2025-08-13 12:32:01
7	Ahmed Chamseddine	32	Python 3	2025-08-13 14:05:28
8	Simen Sørensen	32	Python 3	2025-08-13 22:35:55
9	Hidden user	32	Python 3	2025-08-13 22:44:40
10	Yong Mao	32	Python 3	2025-08-14 02:11:39

#	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
6	Eugen Neagoe	40	Ruby	2026-01-17 18:20:54

#	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	helene	202	Rust	2026-01-25 17:41:23
4	Pankajkumar Patro	212	Rust	2025-09-26 14:32:56
5	Nathaniel Risum	269	Rust	2025-08-22 08:49:27
6	Elijah Gilliam	275	Rust	2026-01-20 14:52:48
7	Jacky Blois	290	Rust	2025-12-15 12:47:48
8	Johannes Sigvardsen	302	Rust	2025-09-19 16:35:05
9	Emil Dichmann	304	Rust	2025-08-17 22:59:04
10	Rasmus Melin	310	Rust	2026-01-19 18:27:14

#	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