Problem A
Forced Choice — Problem Statistics

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Submissions	3350
Accepted submissions	2183
Submission ratio	65.16%
Authors	2056
Full solves [?]	1975
Full solve Ratio	96.06%

#	User	Runtime	Language	Date
1	Matzuka	0.30 s	APL	2025-03-29 16:32:13

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-09-01 12:11:43
2	Chenzhang Hu	0.01 s	Bash	2025-09-12 20:33:09

#	User	Runtime	Language	Date
1	Mikael Fiala-Lundström	0.02 s	C#	2021-03-31 19:43:27
2	Владимир Хилько	0.02 s	C#	2022-05-20 07:53:17
3	Yuwono Bangun Nagoro	0.03 s	C#	2021-04-25 08:37:12
4	Petra Marc	0.03 s	C#	2021-05-02 16:10:17
5	Maykal Droshev	0.03 s	C#	2021-05-25 15:21:06
6	Per Wendt	0.03 s	C#	2021-05-25 16:31:43
7	Toby Maynard	0.03 s	C#	2021-06-11 21:00:45
8	Jonas Thomassen	0.03 s	C#	2021-06-23 20:54:08
9	Victor Hultén Mattsson	0.03 s	C#	2021-07-05 23:31:27
10	Jan Matthiessen	0.03 s	C#	2021-07-21 14:37:45

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.07 s	F#	2022-05-28 21:28:13

#	User	Runtime	Language	Date
1	David Vinje	0.02 s	Go	2022-08-01 18:35:41
2	Krzysztof Gibuła	0.07 s	Go	2021-04-14 00:12:12
3	Norbert Voelker	0.08 s	Go	2021-04-08 20:53:23
4	Yousif Ibrahim	0.09 s	Go	2024-03-25 12:26:15
5	Albert Rise Nielsen	0.14 s	Go	2021-08-20 11:09:33
6	Lucca Dias	0.14 s	Go	2021-11-14 15:54:49
7	Hidden user	0.14 s	Go	2021-12-15 13:40:53
8	Jimmy Nejtron	0.17 s	Go	2022-12-16 16:03:52

#	User	Runtime	Language	Date
1	Tim Put	0.01 s	Haskell	2021-04-18 23:02:00
2	Hidden user	0.01 s	Haskell	2021-05-29 14:27:22
3	Caleb Surovik	0.01 s	Haskell	2021-06-16 00:11:27
4	Ian Koh	0.01 s	Haskell	2021-06-28 09:38:44
5	Brian Hwang	0.01 s	Haskell	2022-09-06 07:06:36
6	Matthew Johnson	0.01 s	Haskell	2022-12-02 18:43:09
7	Sebastian Banert	0.01 s	Haskell	2023-04-21 00:04:14
8	Steinar Simonnes	0.01 s	Haskell	2024-01-15 08:53:57
9	Brent Yorgey	0.02 s	Haskell	2021-03-28 05:37:00
10	Jan Hrček	0.02 s	Haskell	2021-03-28 14:43:47

#	User	Runtime	Language	Date
1	Crystal Sharpe	0.06 s	Java	2021-04-08 03:12:36
2	Sven Rönnbäck	0.06 s	Java	2021-11-30 14:37:34
3	Lee Heng Sheng	0.06 s	Java	2024-04-17 06:59:27
4	Joachim Borup	0.07 s	Java	2021-04-09 16:10:31
5	Emil Bak-Møller	0.07 s	Java	2021-06-06 23:54:21
6	Darshan Vekaria	0.07 s	Java	2022-10-22 19:48:04
7	Samuel Klingström	0.08 s	Java	2021-04-05 19:40:08
8	Goh Zhixuan Jeremiah	0.08 s	Java	2025-02-07 09:41:46
9	Liam Keliher	0.09 s	Java	2021-04-01 03:02:56
10	Kevin Lee	0.09 s	Java	2021-12-08 18:17:40

#	User	Runtime	Language	Date
1	Grant Nelson	0.05 s	JavaScript (Node.js)	2024-01-25 17:28:33
2	Faisal Rahman	0.05 s	JavaScript (Node.js)	2024-02-15 00:17:19
3	Hidden user	0.06 s	JavaScript (Node.js)	2024-08-10 16:49:35
4	John	0.09 s	JavaScript (Node.js)	2022-07-15 03:49:18
5	Marko Doroch	0.09 s	JavaScript (Node.js)	2022-12-12 03:30:03
6	Casper Lundberg	0.10 s	JavaScript (Node.js)	2022-09-14 21:42:52
7	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-03-29 16:51:43
8	Ali	0.42 s	JavaScript (Node.js)	2021-12-19 12:33:12
9	Peter Kedemo	0.42 s	JavaScript (Node.js)	2022-01-02 11:09:03
10	Karim Dridi	0.42 s	JavaScript (Node.js)	2022-01-14 16:36:38

#	User	Runtime	Language	Date
1	Håkan Lindahl	0.02 s	JavaScript (SpiderMonkey)	2022-06-16 00:01:32
2	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2022-08-15 23:33:44
3	Christian Cederquist	0.02 s	JavaScript (SpiderMonkey)	2022-10-31 00:43:42
4	Ben Armstrong	0.02 s	JavaScript (SpiderMonkey)	2025-08-06 20:42:50
5	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2021-03-28 08:37:18
6	Nicklas Utgaard	0.03 s	JavaScript (SpiderMonkey)	2021-04-16 22:00:02
7	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-08-09 12:26:50
8	Zach Tschetter	0.03 s	JavaScript (SpiderMonkey)	2023-05-02 20:53:08

#	User	Runtime	Language	Date
1	Danny Robinson	0.62 s	Julia	2023-09-01 12:25:09
2	Timothy Gaede	0.68 s	Julia	2024-03-31 03:11:55

#	User	Runtime	Language	Date
1	Jacob Huebner	0.14 s	Kotlin	2021-10-07 21:14:22
2	Albert Pala	0.16 s	Kotlin	2021-06-13 16:50:48
3	Nicholas Johnson	0.17 s	Kotlin	2021-10-07 05:32:23
4	Jakub Jagiello	0.24 s	Kotlin	2021-06-14 21:45:53
5	Roger Bongers	0.24 s	Kotlin	2021-06-26 20:35:10
6	Martijn Muijsers	0.24 s	Kotlin	2024-05-27 19:56:39
7	Adam Rankin	0.26 s	Kotlin	2023-04-26 20:16:02
8	Emil Wihlander	0.27 s	Kotlin	2023-07-24 20:23:30
9	Max Holmberg	0.27 s	Kotlin	2023-12-30 11:45:04
10	Marit van Dijk	0.29 s	Kotlin	2021-09-13 19:09:12

#	User	Runtime	Language	Date
1	Jahid Hasan Imon	0.00 s	OCaml	2021-04-15 19:17:57

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Odin	2025-04-30 02:19:36

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2021-03-31 11:24:34
2	David Connolly	0.01 s	Pascal	2021-11-22 13:42:29

#	User	Runtime	Language	Date
1	Saito Ta	0.00 s	Perl	2024-04-08 10:21:26

#	User	Runtime	Language	Date
1	Renate	0.01 s	PHP	2021-04-19 12:26:53
2	Andre Wahyudi	0.01 s	PHP	2022-09-20 06:21:56

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.03 s	Prolog	2023-02-19 20:58:07

#	User	Runtime	Language	Date
1	Yanmarshus Bachtiar	0.03 s	Python 2	2021-05-29 05:53:52
2	Andrei Stoica	0.03 s	Python 2	2021-09-09 12:30:35
3	Hasan Kalzi	0.03 s	Python 2	2022-06-18 10:28:14
4	Andreas Björklund	0.04 s	Python 2	2021-03-28 09:09:02
5	Johan Lyts	0.04 s	Python 2	2021-04-03 21:04:42
6	Thomas Feld	0.04 s	Python 2	2021-05-21 08:21:20
7	Agis Daniels	0.04 s	Python 2	2021-12-13 12:45:02

#	User	Runtime	Language	Date
1	Luis Enrique Cortijo Gonzales	0.04 s	Python 3	2024-09-04 07:09:26
2	Alexandre Charland	0.04 s	Python 3	2024-09-10 22:53:42
3	Anthony	0.04 s	Python 3	2024-09-19 23:01:44
4	Jonathan de Koning	0.04 s	Python 3	2024-09-19 23:43:14
5	Joshua Silva	0.04 s	Python 3	2024-09-20 00:13:39
6	Vivian Tran	0.04 s	Python 3	2024-09-20 00:20:47
7	Fikir Yared	0.04 s	Python 3	2024-09-27 19:58:02
8	Adonyas	0.04 s	Python 3	2024-09-27 20:32:42
9	lankan01	0.04 s	Python 3	2024-09-30 12:05:30
10	Rebecca Jackson	0.04 s	Python 3	2024-10-02 14:41:31

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	Ruby	2021-03-30 21:40:05
2	Jonathan Ogden	0.05 s	Ruby	2021-05-26 21:03:52
3	Régis Hanol	0.05 s	Ruby	2022-01-07 18:39:55
4	TobiasZ	0.05 s	Ruby	2022-01-29 22:12:21
5	Klas af Geijerstam	0.06 s	Ruby	2021-04-07 17:46:02
6	Hadi Qovaizi	0.06 s	Ruby	2021-06-16 21:33:38
7	Thomas Feld	0.06 s	Ruby	2022-11-01 12:30:43
8	dick move	0.06 s	Ruby	2022-11-09 22:08:09
9	Alexander Bilde Pedersen	0.06 s	Ruby	2023-05-07 23:32:06
10	Drew Wilson	0.07 s	Ruby	2023-05-24 18:08:31

#	User	Length	Language	Date
1	Matzuka	89	APL	2025-03-29 16:43:14

#	User	Length	Language	Date
1	Chenzhang Hu	44	Bash	2025-09-12 20:33:09
2	Danny Robinson	79	Bash	2023-09-01 12:11:43

#	User	Length	Language	Date
1	Martin Blom	149	C	2023-10-09 15:07:51
2	Solar Solar	334	C	2021-12-20 08:02:27
3	Raymond Yang	346	C	2021-06-18 22:22:57
4	Ximun Castoreo	347	C	2022-01-07 08:40:54
5	Sambit Palit	363	C	2021-06-26 23:21:48
6	Domnyk Z	371	C	2021-10-07 21:00:07
7	Florian ten Napel	378	C	2025-06-09 13:50:37
8	Sergey Jakobsen	390	C	2021-04-14 21:44:25
9	Andrew Roberts	392	C	2021-05-15 01:58:01
10	Matthew Weston	395	C	2021-12-26 14:06:51

#	User	Length	Language	Date
1	Esty Crow	456	C#	2022-10-03 14:56:41
2	Göran Andersson	540	C#	2022-05-07 22:04:47
3	Deci Bel	567	C#	2025-06-01 11:36:54
4	Petra Marc	584	C#	2021-05-02 16:13:08
5	Eric Weiss	612	C#	2022-05-02 18:34:54
6	Victor Hultén Mattsson	688	C#	2021-07-05 23:31:27
7	Julian Boy	705	C#	2022-12-28 14:34:35
8	Umar Rasyid	728	C#	2025-01-27 00:10:24
9	Gustav Junedahl	745	C#	2022-04-22 19:01:35
10	Mikael Fiala-Lundström	781	C#	2021-03-31 18:45:16

#	User	Length	Language	Date
1	Frans Meulenbroeks	151	C++	2024-11-10 22:50:16
2	a_b__c	169	C++	2021-08-17 19:37:36
3	Darryl Teo	243	C++	2024-02-03 09:41:28
4	owo	251	C++	2024-04-26 02:53:46
5	Yash Mundra	262	C++	2023-03-29 02:00:37
6	Saw Moo De	264	C++	2022-12-22 05:11:48
7	Hein Tay Za	264	C++	2023-01-03 04:38:36
8	黃太陽	265	C++	2021-08-07 21:01:44
9	HYADUKUONING ROQAL	276	C++	2022-11-21 09:39:31
10	Andres Leonel Juarez Careaga	282	C++	2021-05-13 17:03:48

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	410	F#	2022-05-28 21:28:13

#	User	Length	Language	Date
1	Hidden user	351	Go	2021-12-15 13:40:53
2	Jimmy Nejtron	356	Go	2022-12-16 16:03:52
3	Albert Rise Nielsen	383	Go	2021-08-20 11:09:33
4	Yousif Ibrahim	472	Go	2024-03-25 12:26:15
5	David Vinje	502	Go	2022-08-01 18:35:41
6	Krzysztof Gibuła	593	Go	2021-04-14 00:12:12
7	Lucca Dias	669	Go	2021-11-14 15:54:49
8	Norbert Voelker	867	Go	2021-04-08 20:53:23

#	User	Length	Language	Date
1	Matthew Johnson	120	Haskell	2022-12-02 18:52:31
2	Brent Yorgey	162	Haskell	2021-03-28 05:37:00
3	Sebastian Banert	173	Haskell	2023-04-21 00:04:14
4	Tim Put	219	Haskell	2021-04-18 23:02:00
5	Monique Oliveira	243	Haskell	2021-07-13 06:46:21
6	Steinar Simonnes	258	Haskell	2024-01-15 08:53:57
7	Elizabeth Doughty	279	Haskell	2024-02-05 08:34:45
8	Daniel Cabral	300	Haskell	2022-03-03 08:08:20
9	Oisín Mac Fhearaí	343	Haskell	2021-05-22 20:56:18
10	Scott Dauer	346	Haskell	2022-03-05 02:31:34

#	User	Length	Language	Date
1	Raymond Arrington	419	Java	2024-06-08 04:23:50
2	Lim Ting Kai	421	Java	2023-06-03 14:11:35
3	Carter Henderson	427	Java	2021-09-30 17:59:14
4	Mark Jason Galang	465	Java	2022-10-02 16:59:55
5	Brennan Cleland	470	Java	2022-11-20 07:41:31
6	Cory Haas	472	Java	2021-11-18 03:57:22
7	Anton Sandin	475	Java	2022-04-20 13:24:05
8	Wei Lun Toh	480	Java	2022-08-18 06:08:28
9	Tenzin Chophel	495	Java	2021-04-08 19:35:22
10	Selamawit Eshete	496	Java	2022-08-28 03:58:13

#	User	Length	Language	Date
1	Peter Kedemo	378	JavaScript (Node.js)	2022-01-02 11:09:03
2	Karim Dridi	380	JavaScript (Node.js)	2022-01-14 16:36:38
3	Grant Nelson	514	JavaScript (Node.js)	2024-01-25 17:28:33
4	Ali	522	JavaScript (Node.js)	2021-12-19 12:33:12
5	Howard Tin Chi Chan	538	JavaScript (Node.js)	2021-03-29 16:51:43
6	Marko Doroch	550	JavaScript (Node.js)	2022-12-12 03:30:03
7	Hidden user	609	JavaScript (Node.js)	2023-08-04 03:46:10
8	Chris Wong	612	JavaScript (Node.js)	2022-01-12 15:25:48
9	Niamh Limerick	670	JavaScript (Node.js)	2022-02-18 01:40:57
10	John	698	JavaScript (Node.js)	2022-07-15 03:49:18

#	User	Length	Language	Date
1	Christian Cederquist	96	JavaScript (SpiderMonkey)	2022-10-31 00:44:55
2	Peter Menyes	121	JavaScript (SpiderMonkey)	2021-08-09 12:43:01
3	Jimmy Gustafsson	177	JavaScript (SpiderMonkey)	2022-08-15 23:33:44
4	Bjørn Chr. Soltvedt	192	JavaScript (SpiderMonkey)	2021-03-28 08:52:29
5	Ben Armstrong	192	JavaScript (SpiderMonkey)	2025-08-06 20:42:50
6	Zach Tschetter	248	JavaScript (SpiderMonkey)	2023-05-02 20:53:08
7	Håkan Lindahl	341	JavaScript (SpiderMonkey)	2022-06-16 00:01:32
8	Nicklas Utgaard	440	JavaScript (SpiderMonkey)	2021-04-16 22:00:02

#	User	Length	Language	Date
1	Danny Robinson	100	Julia	2023-09-01 12:25:09
2	Timothy Gaede	673	Julia	2024-03-31 03:11:55

#	User	Length	Language	Date
1	Max Holmberg	314	Kotlin	2023-12-30 11:45:04
2	Roger Bongers	347	Kotlin	2021-06-26 20:35:10
3	Lewis Johnson	358	Kotlin	2023-04-28 22:30:53
4	Emil Wihlander	364	Kotlin	2023-07-24 20:23:30
5	Troy Warmboe	396	Kotlin	2021-10-09 02:46:09
6	Jakub Jagiello	407	Kotlin	2021-06-14 21:45:53
7	Marit van Dijk	479	Kotlin	2021-09-13 19:09:12
8	Adam Rankin	497	Kotlin	2023-04-26 20:16:02
9	Martijn Muijsers	535	Kotlin	2024-05-27 19:56:39
10	Hidden user	917	Kotlin	2021-08-20 15:10:12

#	User	Length	Language	Date
1	Jahid Hasan Imon	478	OCaml	2021-04-15 19:17:57

#	User	Length	Language	Date
1	Hidden user	705	Odin	2025-04-30 02:19:36

#	User	Length	Language	Date
1	Ingemar Ragnemalm	378	Pascal	2021-03-31 11:24:34
2	David Connolly	897	Pascal	2021-11-22 13:42:29

#	User	Length	Language	Date
1	Saito Ta	48	Perl	2024-04-08 10:21:26

#	User	Length	Language	Date
1	Renate	287	PHP	2021-04-19 12:26:53
2	Andre Wahyudi	667	PHP	2022-09-20 06:21:56

#	User	Length	Language	Date
1	Hakan Kjellerstrand	275	Prolog	2023-02-19 20:58:07

#	User	Length	Language	Date
1	Thomas Feld	179	Python 2	2021-05-21 08:21:20
2	Johan Lyts	184	Python 2	2021-04-03 21:04:42
3	Yanmarshus Bachtiar	237	Python 2	2021-05-29 05:53:52
4	Andreas Björklund	262	Python 2	2021-03-28 09:09:02
5	Agis Daniels	273	Python 2	2021-12-13 12:46:06
6	Andrei Stoica	334	Python 2	2021-09-09 12:30:35
7	Hasan Kalzi	360	Python 2	2021-03-29 13:47:33

#	User	Length	Language	Date
1	Clement Oh	83	Python 3	2023-07-03 15:24:52
2	Erik Heimdal	90	Python 3	2022-11-26 00:26:51
3	Wilmer Ansgariusson	90	Python 3	2024-10-29 15:38:08
4	Jonathan Ståhl	90	Python 3	2024-10-29 16:35:15
5	Charles Ancheta	91	Python 3	2023-03-27 08:26:45
6	Alexandre Charland	91	Python 3	2024-09-10 22:53:42
7	Tommi Järvenpää	94	Python 3	2024-03-13 13:37:39
8	Hidden user	96	Python 3	2025-08-24 11:55:15
9	Morten Clausen	98	Python 3	2022-09-26 00:21:23
10	Shashank Bhatt	99	Python 3	2023-01-12 01:59:25

#	User	Length	Language	Date
1	Thomas Feld	57	Ruby	2023-01-02 14:27:57
2	dick move	58	Ruby	2022-11-09 22:33:38
3	Russell Ng	69	Ruby	2025-08-15 07:39:13
4	Alexander Bilde Pedersen	103	Ruby	2023-05-07 23:32:06
5	Hidden user	108	Ruby	2021-03-30 21:40:05
6	Régis Hanol	117	Ruby	2022-01-07 18:37:48
7	Jonathan Ogden	138	Ruby	2021-05-26 21:03:52
8	Klas af Geijerstam	153	Ruby	2021-04-07 17:46:02
9	Drew Wilson	210	Ruby	2023-05-24 18:08:31
10	TobiasZ	218	Ruby	2022-01-29 22:12:21

#	User	Length	Language	Date
1	Vincent Lagerros	231	Rust	2024-12-12 02:03:18
2	Bas Dirks	582	Rust	2022-01-03 15:50:40
3	David Rasch	607	Rust	2021-04-02 17:28:26
4	Kok Dith	643	Rust	2021-08-01 04:39:45
5	David Zacek	664	Rust	2021-04-08 03:06:45
6	Thomas	679	Rust	2022-11-04 17:26:21
7	Freek van Keulen	692	Rust	2021-07-10 19:17:00
8	Isak Jägberg	744	Rust	2021-05-05 15:49:16
9	Pankajkumar Patro	752	Rust	2024-07-22 21:36:46
10	Nathaniel Risum	795	Rust	2025-02-24 16:29:12

Solution running time distribution