Problem A
Concatenate — Problem Statistics

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Submissions	2750
Accepted submissions	1703
Submission ratio	61.93%
Authors	1650
Accepted authors	1601
Author ratio	97.03%

#	User	Score	Language	Date
1	Matzuka	100	APL	2025-04-11 10:58:38
2	Simon Baeckelant	100	APL	2025-05-15 12:08:32
3	Arvid Jonasson	100	APL	2025-06-10 22:50:17

#	User	Score	Language	Date
1	Konráð Elí Sigurgeirsson	100	Bash	2025-02-22 15:18:06
2	Chenzhang Hu	100	Bash	2025-04-11 10:38:51
3	Mattia Marziali	100	Bash	2025-04-11 12:59:10
4	Danny Robinson	100	Bash	2025-04-22 16:40:25
5	Jakob Rødal Skaar	100	Bash	2025-04-28 20:12:00
6	Frans Meulenbroeks	100	Bash	2025-05-06 21:38:57
7	Thomas Feld	100	Bash	2025-06-25 14:48:45
8	AZm87	100	Bash	2025-07-02 23:40:33
9	Godmar Back	100	Bash	2025-07-08 16:23:56
10	Theodore Chrysafis	100	Bash	2025-08-03 11:54:10

#	User	Score	Language	Date
1	George Black	100	Common Lisp	2025-08-04 22:14:59
2	yraten	100	Common Lisp	2025-04-28 14:18:11

#	User	Score	Language	Date
1	Magnus Baasch Langkilde	100	F#	2025-04-23 09:35:57
2	kristoffer spicker	100	F#	2025-07-26 16:04:06

#	User	Score	Language	Date
1	keyansheng	100	Go	2025-04-16 09:29:25
2	Norbert Voelker	100	Go	2025-05-17 19:49:33
3	Jimmy Nejtron	100	Go	2025-07-04 15:09:14
4	Casper Lundberg	100	Go	2025-07-29 08:10:52

#	User	Score	Language	Date
1	Marco GarciaMontes	100	JavaScript (Node.js)	2025-08-06 10:06:09
2	Ihor Kolisnyk	100	JavaScript (Node.js)	2025-09-02 17:30:10

#	User	Score	Language	Date
1	Bjørn Chr. Soltvedt	100	JavaScript (SpiderMonkey)	2025-04-11 00:25:50
2	Benjamin Justice	100	JavaScript (SpiderMonkey)	2025-04-19 00:33:43
3	Christian Cederquist	100	JavaScript (SpiderMonkey)	2025-04-30 07:00:08
4	Jimmy Gustafsson	100	JavaScript (SpiderMonkey)	2025-05-13 22:28:28
5	Ben Armstrong	100	JavaScript (SpiderMonkey)	2025-06-27 20:41:17

#	User	Score	Language	Date
1	Timothy Gaede	100	Julia	2025-04-11 08:36:42

#	User	Score	Language	Date
1	Hamdanil Rasyid	100	Kotlin	2025-04-12 05:43:37
2	ANDREY FELIPE PINTO URIBE	100	Kotlin	2025-05-09 22:21:37
3	Mikkel C. B. Christensen	100	Kotlin	2025-08-20 21:36:50

#	User	Score	Language	Date
1	Shinji Koshida	100	Lua	2025-04-13 14:04:38
2	Hidden user	100	Lua	2025-05-12 20:07:04
3	Abdulrahman Slaghour	100	Lua	2025-06-25 18:40:15
4	Erlend B	100	Lua	2025-08-21 07:38:17

#	User	Score	Language	Date
1	Nino Bašić	100	Nim	2025-05-31 16:09:21

#	User	Score	Language	Date
1	Hidden user	100	OCaml	2025-05-29 17:24:11
2	John Khoo	100	OCaml	2025-06-10 17:55:35
3	Hidden user	100	OCaml	2025-07-03 08:45:41

#	User	Score	Language	Date
1	Hidden user	100	Odin	2025-04-20 00:50:54

#	User	Score	Language	Date
1	Ingemar Ragnemalm	100	Pascal	2025-04-15 20:48:56
2	Lucka Heric	100	Pascal	2025-07-14 08:23:44
3	David Connolly	100	Pascal	12:06:39
4	Cian Curtis	100	Pascal	19:02:47

#	User	Score	Language	Date
1	J Sotomayor	100	Perl	2025-04-14 04:48:16

#	User	Score	Language	Date
1	Arnar Bjarni Arnarson	100	Prolog	2025-04-12 02:32:05

#	User	Score	Language	Date
1	Hidden user	100	Python 2	2025-04-15 09:38:21
2	Yashvanth S	100	Python 2	2025-07-23 11:47:33
3	Sivasankaran D	100	Python 2	2025-07-24 11:21:09
4	THIRUKUMARAN S	100	Python 2	2025-07-24 11:21:19

#	User	Score	Language	Date
1	Angus Gibson	100	Racket	2025-07-14 01:59:20

#	User	Score	Language	Date
1	Noah Hessen Bjerke	100	Ruby	2025-04-12 21:35:15
2	Russell Ng	100	Ruby	2025-05-12 14:26:31
3	Miorel Palii	100	Ruby	2025-06-28 16:10:35
4	Frederik Petersen	100	Ruby	2025-09-07 16:14:07

#	User	Score	Language	Date
1	Hidden user	100	Swift	2025-04-10 23:52:46
2	La Ode muhammad Yudhy Prayitno	100	Swift	2025-04-12 17:41:49
3	AZm87	100	Swift	2025-07-02 23:33:57

#	User	Score	Language	Date
1	Elina Eriksson Hult	100	TypeScript	2025-07-10 15:33:16

#	User	Runtime	Language	Date
1	Matzuka	0.01 s	APL	2025-04-11 10:58:38
2	Simon Baeckelant	0.01 s	APL	2025-05-15 12:08:32
3	Arvid Jonasson	0.01 s	APL	2025-06-10 22:50:17

#	User	Runtime	Language	Date
1	Konráð Elí Sigurgeirsson	0.01 s	Bash	2025-02-22 15:18:06
2	Chenzhang Hu	0.01 s	Bash	2025-04-11 10:38:51
3	Mattia Marziali	0.01 s	Bash	2025-04-11 12:59:10
4	Danny Robinson	0.01 s	Bash	2025-04-22 16:40:25
5	Jakob Rødal Skaar	0.01 s	Bash	2025-04-28 20:12:00
6	Frans Meulenbroeks	0.01 s	Bash	2025-05-06 21:38:57
7	Thomas Feld	0.01 s	Bash	2025-06-25 14:48:45
8	AZm87	0.01 s	Bash	2025-07-02 23:40:33
9	Godmar Back	0.01 s	Bash	2025-07-08 16:23:56
10	Theodore Chrysafis	0.01 s	Bash	2025-08-03 11:54:10

#	User	Runtime	Language	Date
1	Dennis Stegnell	0.04 s	C#	2025-04-11 07:36:03
2	Deci Bel	0.04 s	C#	2025-04-11 20:00:46
3	svante	0.04 s	C#	2025-04-18 12:54:17
4	Matias Córdova	0.04 s	C#	2025-04-22 15:21:02
5	Nicholas Hood	0.04 s	C#	2025-04-30 02:14:34
6	Julio Cesar	0.04 s	C#	2025-05-02 18:26:03
7	Juan Pablo Morales	0.04 s	C#	2025-05-03 21:15:03
8	Walkyria Audivert Lino	0.04 s	C#	2025-05-08 15:22:50
9	Carlos Palacios	0.04 s	C#	2025-05-09 01:51:15
10	Fabiola M.	0.04 s	C#	2025-05-22 16:12:50

#	User	Runtime	Language	Date
1	George Black	0.01 s	Common Lisp	2025-08-04 22:14:59
2	yraten	0.03 s	Common Lisp	2025-04-28 14:18:11

#	User	Runtime	Language	Date
1	Magnus Baasch Langkilde	0.06 s	F#	2025-04-23 09:35:57
2	kristoffer spicker	0.06 s	F#	2025-07-26 16:04:06

#	User	Runtime	Language	Date
1	keyansheng	0.00 s	Go	2025-04-16 09:29:25
2	Norbert Voelker	0.00 s	Go	2025-05-17 19:49:33
3	Jimmy Nejtron	0.00 s	Go	2025-07-04 15:09:14
4	Casper Lundberg	0.00 s	Go	2025-07-29 08:10:52

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	Java	2025-04-13 14:35:11
2	Ben Cobb	0.04 s	Java	2025-04-14 16:27:18
3	eti2	0.04 s	Java	2025-04-21 14:34:45
4	Guangyi Zhou	0.04 s	Java	2025-05-11 03:22:49
5	Markus Bao	0.04 s	Java	2025-05-31 14:53:28
6	Julius Griebel	0.04 s	Java	2025-06-14 15:05:08
7	Stela Palii	0.04 s	Java	2025-06-16 03:52:20
8	Nathan McAlinden	0.04 s	Java	2025-06-25 19:24:43
9	Cambrien Malenko	0.04 s	Java	2025-07-29 18:32:51
10	BRUNO FELIX DE SOUSA	0.04 s	Java	2025-08-26 02:41:31

#	User	Runtime	Language	Date
1	Marco GarciaMontes	0.04 s	JavaScript (Node.js)	2025-08-06 10:06:09
2	Ihor Kolisnyk	0.04 s	JavaScript (Node.js)	2025-09-02 17:30:10

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2025-04-11 00:25:50
2	Benjamin Justice	0.02 s	JavaScript (SpiderMonkey)	2025-04-19 00:33:43
3	Christian Cederquist	0.02 s	JavaScript (SpiderMonkey)	2025-04-30 07:00:08
4	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2025-05-13 22:28:28
5	Ben Armstrong	0.02 s	JavaScript (SpiderMonkey)	2025-06-27 20:41:17

#	User	Runtime	Language	Date
1	Timothy Gaede	0.29 s	Julia	2025-04-11 08:36:42

#	User	Runtime	Language	Date
1	Hamdanil Rasyid	0.20 s	Kotlin	2025-04-12 05:43:37
2	ANDREY FELIPE PINTO URIBE	0.20 s	Kotlin	2025-05-09 22:21:37
3	Mikkel C. B. Christensen	0.24 s	Kotlin	2025-08-20 21:36:50

#	User	Runtime	Language	Date
1	Shinji Koshida	0.00 s	Lua	2025-04-13 14:04:38
2	Hidden user	0.00 s	Lua	2025-05-12 20:07:04
3	Abdulrahman Slaghour	0.00 s	Lua	2025-06-25 18:40:15
4	Erlend B	0.00 s	Lua	2025-08-21 07:38:17

#	User	Runtime	Language	Date
1	Nino Bašić	0.00 s	Nim	2025-05-31 16:09:21

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	OCaml	2025-05-29 17:24:11
2	John Khoo	0.00 s	OCaml	2025-06-10 17:55:35
3	Hidden user	0.00 s	OCaml	2025-07-03 08:45:41

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-04-20 00:50:54

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2025-04-15 20:48:56
2	Lucka Heric	0.00 s	Pascal	2025-07-14 08:23:44
3	David Connolly	0.00 s	Pascal	12:06:39
4	Cian Curtis	0.00 s	Pascal	19:02:47

#	User	Runtime	Language	Date
1	J Sotomayor	0.00 s	Perl	2025-04-14 04:48:16

#	User	Runtime	Language	Date
1	Arnar Bjarni Arnarson	0.02 s	Prolog	2025-04-12 02:32:05

#	User	Runtime	Language	Date
1	Hidden user	0.07 s	Python 2	2025-04-15 09:38:21
2	Yashvanth S	0.07 s	Python 2	2025-07-23 11:47:33
3	Sivasankaran D	0.07 s	Python 2	2025-07-24 11:21:09
4	THIRUKUMARAN S	0.07 s	Python 2	2025-07-24 11:21:19

#	User	Runtime	Language	Date
1	Einar Darri sveinbjörnsson	0.04 s	Python 3	2025-02-22 13:01:25
2	Hannes Kristján Hannesson	0.04 s	Python 3	2025-02-22 13:03:46
3	Jón Logi Dagbjartsson	0.04 s	Python 3	2025-02-22 13:04:00
4	Hlynur Hafsteinsson	0.04 s	Python 3	2025-02-22 13:05:30
5	Óliver Máni	0.04 s	Python 3	2025-02-22 13:06:22
6	Bjartur Sigurjonsson	0.04 s	Python 3	2025-02-22 13:34:35
7	Samúel Arnar Hafsteinsson	0.04 s	Python 3	2025-02-22 13:40:12
8	Bjarki Ágúst Guðmundsson	0.04 s	Python 3	2025-02-22 13:46:43
9	Milan Petrusic	0.04 s	Python 3	2025-02-22 14:53:03
10	Hidden user	0.04 s	Python 3	2025-02-22 15:14:03

#	User	Runtime	Language	Date
1	Angus Gibson	0.13 s	Racket	2025-07-14 01:59:20

#	User	Runtime	Language	Date
1	Noah Hessen Bjerke	0.06 s	Ruby	2025-04-12 21:35:15
2	Russell Ng	0.07 s	Ruby	2025-05-12 14:26:31
3	Miorel Palii	0.07 s	Ruby	2025-06-28 16:10:35
4	Frederik Petersen	0.07 s	Ruby	2025-09-07 16:14:07

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Swift	2025-04-10 23:52:46
2	La Ode muhammad Yudhy Prayitno	0.00 s	Swift	2025-04-12 17:41:49
3	AZm87	0.00 s	Swift	2025-07-02 23:33:57

#	User	Runtime	Language	Date
1	Elina Eriksson Hult	0.04 s	TypeScript	2025-07-10 15:33:16

#	User	Length	Language	Date
1	Arvid Jonasson	16	APL	2025-06-10 22:50:17
2	Matzuka	20	APL	2025-04-11 11:06:05
3	Simon Baeckelant	29	APL	2025-05-15 12:08:32

#	User	Length	Language	Date
1	Chenzhang Hu	5	Bash	2025-04-11 10:41:27
2	Danny Robinson	9	Bash	2025-04-22 16:40:25
3	Thomas Feld	9	Bash	2025-06-25 14:49:45
4	AZm87	9	Bash	2025-07-02 23:40:33
5	Mattia Marziali	10	Bash	2025-04-11 12:59:10
6	Frans Meulenbroeks	17	Bash	2025-05-06 21:38:57
7	Konráð Elí Sigurgeirsson	23	Bash	2025-02-22 15:18:06
8	Jakob Rødal Skaar	23	Bash	2025-04-28 20:12:00
9	Godmar Back	194	Bash	2025-07-08 16:23:56
10	Theodore Chrysafis	280	Bash	2025-08-03 11:54:10

#	User	Length	Language	Date
1	Carl Pittenger	78	C	2025-08-22 23:51:21
2	Jonatan Altebro	87	C	2025-04-14 12:12:04
3	Hidden user	93	C	2025-04-24 07:17:06
4	MYLAMBIGAI G	103	C	2025-04-18 12:18:14
5	KEERTHIRAJ G	104	C	2025-04-24 10:23:50
6	Hidden user	105	C	2025-04-19 12:26:05
7	KAMALESH SK	106	C	2025-04-16 11:35:15
8	SOUNDHARYA C	106	C	2025-04-23 08:03:30
9	Martin Blom	106	C	15:15:26
10	To Om	109	C	2025-08-31 00:45:51

#	User	Length	Language	Date
1	Jan Matthiessen	58	C#	2025-05-29 19:11:46
2	Mouhamad M.M	74	C#	2025-08-30 19:50:26
3	Morten Jensen	98	C#	2025-08-21 21:35:04
4	svante	102	C#	2025-04-18 12:54:17
5	Deci Bel	109	C#	2025-04-11 20:00:46
6	Fabiola M.	125	C#	2025-05-22 16:12:50
7	Anthony Ye	154	C#	2025-07-17 20:52:45
8	Mika 606	158	C#	2025-05-29 02:38:40
9	Erik Algesten	159	C#	2025-06-21 18:06:48
10	Emmanuel Gorostiaga	176	C#	2025-05-29 02:15:32

#	User	Length	Language	Date
1	Chairunnisa Tsabitah	99	C++	2025-05-15 13:35:43
2	ngmh	103	C++	2025-07-11 20:24:44
3	吳秉諺	105	C++	2025-04-29 14:07:35
4	Frederik Vase	107	C++	2025-06-04 22:27:21
5	Darren Joey Nathan	107	C++	2025-08-26 09:27:55
6	Ralf Merhof	108	C++	2025-04-18 12:10:45
7	Eunike Tan	109	C++	2025-08-28 13:26:22
8	William Handfield	110	C++	2025-05-22 00:26:42
9	Hidden user	110	C++	2025-08-18 13:00:03
10	Irawan Tanudirdjo	110	C++	2025-08-28 13:25:33

#	User	Length	Language	Date
1	yraten	73	Common Lisp	2025-04-28 14:18:11
2	George Black	326	Common Lisp	2025-08-04 22:14:59

#	User	Length	Language	Date
1	kristoffer spicker	86	F#	2025-07-26 16:04:06
2	Magnus Baasch Langkilde	345	F#	2025-04-23 09:35:57

#	User	Length	Language	Date
1	Jimmy Nejtron	120	Go	2025-07-04 15:09:14
2	Norbert Voelker	220	Go	2025-05-17 19:49:33
3	keyansheng	274	Go	2025-04-16 09:29:25
4	Casper Lundberg	441	Go	2025-07-29 08:10:52

#	User	Length	Language	Date
1	Juan Miguel Vilar	26	Haskell	2025-07-22 11:24:29
2	Steinar Simonnes	27	Haskell	2025-04-15 07:27:14
3	Herdi Saleh	28	Haskell	2025-04-16 12:01:56
4	Adhyan H.	49	Haskell	2025-08-30 02:43:12
5	Pathompong Kwangtong	50	Haskell	2025-09-06 15:12:13
6	Jesper Bech Christensen	65	Haskell	2025-08-19 18:39:38
7	Atli Fannar Franklín	78	Haskell	2025-04-11 20:54:20
8	Timur Khazhiev	81	Haskell	2025-04-16 09:39:34
9	hjalte bjoernstrup	81	Haskell	2025-09-05 04:30:21
10	Daniel Cabral	86	Haskell	2025-06-18 12:55:09

#	User	Length	Language	Date
1	LAURA MICHELL GARCIA URIBE	146	Java	2025-08-26 06:42:26
2	eti2	149	Java	2025-04-21 14:39:43
3	VIGNESHWARAN.M	160	Java	2025-04-13 14:32:47
4	Kavya S	173	Java	2025-04-11 06:15:19
5	Jonathan Bartik	176	Java	2025-07-29 19:47:17
6	Hidden user	181	Java	2025-07-26 20:52:05
7	PAVITHRA M	187	Java	2025-04-11 05:59:58
8	Sigurbjörg Erla	190	Java	2025-06-23 01:35:07
9	David Paul	196	Java	2025-05-19 06:36:12
10	Florian Klöckner	197	Java	2025-06-12 17:56:16

#	User	Length	Language	Date
1	Ihor Kolisnyk	196	JavaScript (Node.js)	2025-09-02 17:30:10
2	Marco GarciaMontes	433	JavaScript (Node.js)	2025-08-06 10:06:09

#	User	Length	Language	Date
1	Jimmy Gustafsson	25	JavaScript (SpiderMonkey)	2025-05-13 22:28:28
2	Ben Armstrong	28	JavaScript (SpiderMonkey)	2025-06-27 20:41:17
3	Bjørn Chr. Soltvedt	29	JavaScript (SpiderMonkey)	2025-04-11 00:25:50
4	Benjamin Justice	53	JavaScript (SpiderMonkey)	2025-04-19 00:33:43
5	Christian Cederquist	74	JavaScript (SpiderMonkey)	2025-04-30 07:00:08

#	User	Length	Language	Date
1	Timothy Gaede	88	Julia	2025-04-11 08:36:42

#	User	Length	Language	Date
1	Hamdanil Rasyid	46	Kotlin	2025-04-12 05:43:37
2	ANDREY FELIPE PINTO URIBE	94	Kotlin	2025-05-09 22:21:37
3	Mikkel C. B. Christensen	160	Kotlin	2025-08-20 21:36:50

#	User	Length	Language	Date
1	Erlend B	27	Lua	2025-08-21 07:38:17
2	Hidden user	29	Lua	2025-05-12 20:07:04
3	Shinji Koshida	68	Lua	2025-04-13 14:04:38
4	Abdulrahman Slaghour	78	Lua	2025-06-25 18:40:15

#	User	Length	Language	Date
1	Nino Bašić	72	Nim	2025-05-31 16:09:21

#	User	Length	Language	Date
1	Hidden user	59	OCaml	2025-05-29 17:24:11
2	Hidden user	86	OCaml	2025-07-03 08:45:41
3	John Khoo	91	OCaml	2025-06-10 17:55:35

#	User	Length	Language	Date
1	Hidden user	495	Odin	2025-04-20 00:50:54

#	User	Length	Language	Date
1	Cian Curtis	92	Pascal	19:11:59
2	Ingemar Ragnemalm	104	Pascal	2025-04-15 20:48:56
3	David Connolly	138	Pascal	12:06:39
4	Lucka Heric	141	Pascal	2025-07-14 08:23:44

#	User	Length	Language	Date
1	J Sotomayor	50	Perl	2025-04-14 04:48:16

#	User	Length	Language	Date
1	Arnar Bjarni Arnarson	869	Prolog	2025-04-12 02:32:05

#	User	Length	Language	Date
1	Hidden user	29	Python 2	2025-04-15 09:38:21
2	Yashvanth S	37	Python 2	2025-07-23 11:47:33
3	Sivasankaran D	37	Python 2	2025-07-24 11:21:09
4	THIRUKUMARAN S	37	Python 2	2025-07-24 11:21:19

#	User	Length	Language	Date
1	Einar Darri sveinbjörnsson	22	Python 3	2025-02-22 13:01:25
2	Elvar Árni Bjarnason	22	Python 3	2025-02-22 16:17:13
3	Lorenz Jade Ycot	22	Python 3	2025-03-08 12:36:50
4	Bjørn Chr. Soltvedt	22	Python 3	2025-04-11 00:30:21
5	Jiaye Will Wang	22	Python 3	2025-04-11 02:37:48
6	Nicholas Russell Saerang	22	Python 3	2025-04-11 04:09:36
7	Markus Mathiasen	22	Python 3	2025-04-11 08:39:16
8	Mattia Marziali	22	Python 3	2025-04-11 12:56:58
9	Lasse Letager Hansen	22	Python 3	2025-04-11 13:57:07
10	Simen Sørensen	22	Python 3	2025-04-11 15:32:32

#	User	Length	Language	Date
1	Angus Gibson	102	Racket	2025-07-14 01:59:20

#	User	Length	Language	Date
1	Noah Hessen Bjerke	18	Ruby	2025-04-12 21:35:15
2	Russell Ng	18	Ruby	2025-05-12 14:26:31
3	Frederik Petersen	20	Ruby	2025-09-07 16:14:07
4	Miorel Palii	30	Ruby	2025-06-28 16:10:35

#	User	Length	Language	Date
1	Xiu-Heng Hua	107	Rust	2025-07-02 08:57:47
2	Mikael Fiala-Lundström	146	Rust	2025-04-22 01:10:18
3	Vincent Lagerros	147	Rust	2025-04-11 16:23:44
4	David Rasch	154	Rust	2025-07-03 14:08:36
5	Pankajkumar Patro	185	Rust	2025-04-12 01:14:25
6	Henrik Josefsson	190	Rust	2025-07-10 13:38:25
7	Jonathan Yudi Gunawan	197	Rust	2025-07-29 17:16:08
8	Nicolas Bliss-Carrascosa	208	Rust	2025-08-30 19:59:27
9	Isak Jägberg	219	Rust	2025-04-16 17:25:20
10	Emil Dichmann	230	Rust	2025-08-15 19:34:34

#	User	Length	Language	Date
1	AZm87	32	Swift	2025-07-02 23:33:57
2	Hidden user	50	Swift	2025-04-10 23:52:46
3	La Ode muhammad Yudhy Prayitno	79	Swift	2025-04-12 17:41:49

#	User	Length	Language	Date
1	Elina Eriksson Hult	238	TypeScript	2025-07-10 15:33:16

Solution running time distribution