Problem A
Prsteni — Problem Statistics

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Submissions	5060
Accepted submissions	3021
Submission ratio	59.70%
Authors	2857
Full solves [?]	2711
Full solve Ratio	94.89%

#	User	Runtime	Language	Date
1	Stefan Baumann	0.01 s	APL	2023-05-15 08:50:39

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.03 s	Bash	2023-10-10 13:51:44

#	User	Runtime	Language	Date
1	masosz	0.02 s	C#	2015-02-17 21:20:09
2	Mads Storm Hansen	0.02 s	C#	2015-07-17 20:50:59
3	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-06-13 15:26:21
4	Robert Low	0.02 s	C#	2016-07-18 15:05:04
5	Ugnius Skučas	0.02 s	C#	2016-10-15 11:13:20
6	Hidden user	0.02 s	C#	2017-04-22 10:12:15
7	Rasmus Brants	0.02 s	C#	2017-05-29 10:02:56
8	Þorsteinn Þorvaldsson	0.02 s	C#	2017-06-04 13:45:36
9	Johan Pettersson	0.02 s	C#	2018-04-12 12:02:07
10	Дмитро Рудий	0.02 s	C#	2018-04-20 20:51:48

#	User	Runtime	Language	Date
1	Kevin Gomez	0.01 s	Common Lisp	2025-05-19 05:50:15
2	David Cawthon	0.02 s	Common Lisp	2019-05-03 23:40:58

#	User	Runtime	Language	Date
1	Sebastian Sternberg	0.04 s	F#	2021-09-13 16:27:06
2	Jacob Harris Cryer Kragh	0.04 s	F#	2022-06-23 17:19:04
3	Patrick Bahr	0.05 s	F#	2021-02-21 13:35:30
4	Morten Clausen	0.08 s	F#	2020-07-31 21:51:37
5	Peter Iatsenia	0.08 s	F#	2026-02-11 14:57:34

#	User	Runtime	Language	Date
1	Romario HUAMANI PACCAYA	0.00 s	Go	2025-08-31 17:13:05
2	Jimmy Nejtron	0.08 s	Go	2020-09-24 14:39:46
3	Norbert Voelker	0.08 s	Go	2021-04-14 14:28:11
4	Krzysztof Gibuła	0.08 s	Go	2021-05-09 20:40:39
5	Yudit Yudiarto	0.08 s	Go	2021-09-19 12:46:16

#	User	Runtime	Language	Date
1	Simon Klein	0.05 s	Java	2011-12-14 18:35:21
2	Aked Hindi	0.05 s	Java	2013-02-05 15:55:23
3	Łukasz Antkowiak	0.05 s	Java	2015-09-13 08:54:38
4	Hidden user	0.05 s	Java	2015-09-16 05:54:41
5	Michael Sullivan	0.05 s	Java	2015-09-16 14:11:05
6	Nick Wu	0.05 s	Java	2015-10-07 23:08:01
7	Michel Langeveld	0.05 s	Java	2015-12-06 21:24:36
8	Hidden user	0.05 s	Java	2016-05-21 10:51:33
9	Martijn Muijsers	0.05 s	Java	2016-10-01 13:58:20
10	William Brigham	0.05 s	Java	2017-04-19 01:09:24

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	JavaScript (Node.js)	2024-11-02 03:30:11
2	Gurushant Gurushant	0.09 s	JavaScript (Node.js)	2023-05-04 19:41:00
3	Hidden user	0.40 s	JavaScript (Node.js)	2019-08-09 04:22:54
4	John	0.42 s	JavaScript (Node.js)	2020-08-07 09:58:33
5	Michael Zetterholm	0.42 s	JavaScript (Node.js)	2020-09-23 12:25:19
6	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-07 15:11:58
7	Ryoki Kunii	0.42 s	JavaScript (Node.js)	2020-10-09 02:15:33
8	Chris Wong	0.42 s	JavaScript (Node.js)	2021-02-06 02:00:41
9	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-02-13 09:23:54
10	Hovhannes Kantuni	0.43 s	JavaScript (Node.js)	2020-10-17 20:15:05

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-23 13:10:34
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-01-28 01:19:59
3	J M	0.01 s	JavaScript (SpiderMonkey)	2016-11-09 00:41:48
4	Tor Nordqvist	0.01 s	JavaScript (SpiderMonkey)	2016-11-15 11:14:33
5	Nicklas Utgaard	0.02 s	JavaScript (SpiderMonkey)	2021-12-23 11:59:12
6	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2022-11-10 21:40:36
7	Evan Magill	0.02 s	JavaScript (SpiderMonkey)	2024-04-25 18:24:47
8	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-06-16 10:30:55
9	Zach Tschetter	0.02 s	JavaScript (SpiderMonkey)	2025-01-30 23:59:13
10	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-02-08 20:31:56

#	User	Runtime	Language	Date
1	Hidden user	0.40 s	Julia	2025-03-19 17:22:00
2	Danny Robinson	0.65 s	Julia	2023-06-23 08:07:30
3	Timothy Gaede	0.71 s	Julia	2024-03-25 03:19:59

#	User	Runtime	Language	Date
1	Emil Eriksmoen Stensland	0.15 s	Kotlin	2021-02-15 00:38:46
2	Gaurav Tyagi	0.16 s	Kotlin	2018-11-21 22:41:58
3	Dayan Ruben Gonzalez	0.16 s	Kotlin	2020-09-29 21:10:40
4	Adam Rankin	0.18 s	Kotlin	2023-05-04 05:14:19
5	Neil Harmon	0.20 s	Kotlin	2019-04-08 13:50:49
6	Adam Koprowski	0.20 s	Kotlin	2021-05-05 06:53:13
7	Albert Pala	0.20 s	Kotlin	2021-07-03 22:06:34
8	Sean Hagen	0.20 s	Kotlin	2021-08-16 22:30:12
9	Magnus Tønnessen	0.20 s	Kotlin	2022-05-13 12:56:01
10	Aleksander	0.21 s	Kotlin	2024-01-02 12:16:40

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-05-04 18:49:08

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-03-01 21:19:59
2	David Connolly	0.00 s	Pascal	2022-07-06 13:23:42

#	User	Runtime	Language	Date
1	Renate Fiala-Lundström	0.01 s	PHP	2021-06-27 08:03:44
2	Nick Hargrove	0.01 s	PHP	2022-05-19 12:54:07
3	Andre Wahyudi	0.01 s	PHP	2022-10-25 06:49:20

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.01 s	Prolog	2019-05-31 06:32:29
2	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-01 10:14:04

#	User	Runtime	Language	Date
1	Urban Pettersson	0.02 s	Python 2	2016-01-22 16:06:16
2	Çağdaş Öztekin	0.02 s	Python 2	2017-09-06 20:18:37
3	Nicholas Joaquin	0.02 s	Python 2	2017-12-31 07:23:58
4	Andrei Stoica	0.02 s	Python 2	2018-05-14 21:29:41
5	Kristmundur Agust	0.03 s	Python 2	2015-03-04 22:31:19
6	Christofer Ohlsson	0.03 s	Python 2	2015-05-08 19:25:36
7	Erik Odenman	0.03 s	Python 2	2015-05-11 21:36:12
8	Snild Dolkow	0.03 s	Python 2	2015-09-13 11:53:50
9	Arne Tobias Malkenes Ødegaard	0.03 s	Python 2	2015-12-05 14:54:58
10	Alexander Teno	0.03 s	Python 2	2016-03-22 21:04:52

#	User	Runtime	Language	Date
1	John Harrison	0.02 s	Python 3	2015-09-16 20:21:05
2	Kent Tsuenchy	0.02 s	Python 3	2016-01-27 05:12:52
3	Terrence Reilly	0.02 s	Python 3	2016-02-25 15:39:09
4	Lucia Pál (Simanová)	0.02 s	Python 3	2016-06-22 22:54:37
5	Drew Lytle	0.02 s	Python 3	2016-09-26 20:28:36
6	Christian Lindeström	0.02 s	Python 3	2016-10-04 12:36:57
7	Joey Chan	0.02 s	Python 3	2016-11-01 23:36:54
8	Carlos Alvarado	0.02 s	Python 3	2016-12-03 04:49:01
9	Rick May	0.02 s	Python 3	2017-03-01 18:43:43
10	Ionel Hindorean	0.02 s	Python 3	2017-03-13 21:06:49

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.13 s	Racket	2025-01-30 02:26:43

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-01-27 12:24:28
2	Clifford Owino	0.03 s	Ruby	2017-05-24 10:55:00
3	노승현	0.04 s	Ruby	2019-05-15 14:44:55
4	Hidden user	0.04 s	Ruby	2019-10-04 16:16:59
5	Hadi Qovaizi	0.05 s	Ruby	2021-08-12 11:03:18
6	Yusuke Ichiki	0.05 s	Ruby	2022-06-20 17:19:52
7	Thomas Feld	0.06 s	Ruby	2022-11-07 08:48:55
8	Alexander Bilde Pedersen	0.06 s	Ruby	2023-05-14 21:45:45
9	Ian Steiner	0.06 s	Ruby	2024-07-31 17:53:26
10	Pratham Patel	0.06 s	Ruby	2025-02-10 16:19:10

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Zig	2025-10-18 09:32:48
2	Grettir Heimisson	0.00 s	Zig	2025-11-11 22:55:49

#	User	Length	Language	Date
1	Stefan Baumann	66	APL	2023-05-15 08:50:39

#	User	Length	Language	Date
1	Chenzhang Hu	32	Bash	2025-09-13 00:05:36

#	User	Length	Language	Date
1	Martin Blom	140	C	2023-10-16 20:39:22
2	Mouad Naciri	263	C	2017-04-02 20:27:20
3	Ximun Castoreo	282	C	2020-07-21 09:56:02
4	Drake Packard	296	C	2018-03-06 23:42:38
5	Mai Tuyết	337	C	2024-07-27 08:23:01
6	Matthew Weston	343	C	2022-01-03 17:38:16
7	이정섭	348	C	2022-12-27 12:06:40
8	Sebastian Weiermann	350	C	2017-07-23 16:24:30
9	andromeda378	350	C	2023-12-11 18:34:08
10	Saskia Scholz	356	C	2023-05-04 06:29:00

#	User	Length	Language	Date
1	Julia Duffy	439	C#	2026-03-17 23:46:28
2	Esty Crow	507	C#	2022-12-14 21:19:11
3	Leslie Yip	533	C#	2022-07-05 14:03:01
4	Thomas Norris	594	C#	2019-06-24 17:26:13
5	Deci Bel	609	C#	2025-08-10 08:52:10
6	Umar Rasyid	626	C#	2025-04-08 23:08:35
7	Kunwei Zhang	627	C#	2018-06-09 04:51:24
8	Anthony Ye	641	C#	2022-12-18 17:43:12
9	Jens Erik	685	C#	2025-11-20 00:07:54
10	Simon Thillemann Nielsen	685	C#	2025-11-20 00:08:15

#	User	Length	Language	Date
1	Frans Meulenbroeks	129	C++	2024-10-15 16:53:36
2	a_b__c	143	C++	2021-08-17 17:50:59
3	Đậu Huy Minh	181	C++	2022-10-13 04:01:27
4	Irawan Tanudirdjo	190	C++	2025-07-28 01:42:53
5	Richard Putra	194	C++	2018-02-20 06:13:12
6	Scott MacIntosh	197	C++	2019-11-06 03:05:34
7	Zane Yu	200	C++	2018-12-31 13:11:25
8	evan	200	C++	2025-09-26 09:39:45
9	Ernest Ng Zi Xuan	201	C++	2025-06-26 01:50:36
10	Yeung Man Tsung	210	C++	2022-11-20 07:47:06

#	User	Length	Language	Date
1	Kevin Gomez	89	Common Lisp	2025-05-19 05:50:15
2	David Cawthon	383	Common Lisp	2019-05-03 23:40:58

#	User	Length	Language	Date
1	Morten Clausen	455	F#	2020-07-31 21:51:37
2	Peter Iatsenia	457	F#	2026-02-11 14:57:34
3	Sebastian Sternberg	487	F#	2021-09-13 16:27:06
4	Jacob Harris Cryer Kragh	516	F#	2022-06-23 17:19:04
5	Patrick Bahr	2033	F#	2021-02-21 13:35:30

#	User	Length	Language	Date
1	Romario HUAMANI PACCAYA	632	Go	2025-08-31 17:13:05
2	Yudit Yudiarto	698	Go	2021-09-19 12:46:16
3	Krzysztof Gibuła	712	Go	2021-05-09 20:40:39
4	Norbert Voelker	826	Go	2021-04-14 14:28:11
5	Jimmy Nejtron	947	Go	2020-09-24 14:39:46

#	User	Length	Language	Date
1	Sebastian Banert	168	Haskell	2023-04-22 11:29:15
2	Llaurence Git	231	Haskell	2018-11-07 12:21:59
3	Anthony Clark	254	Haskell	2017-04-11 20:07:17
4	Jan Hlavacek	293	Haskell	2016-12-08 00:55:26
5	Hidden user	295	Haskell	2019-08-14 11:30:37
6	Rafał Gwoździński	310	Haskell	2021-03-17 20:06:20
7	Shinji Koshida	314	Haskell	2025-02-27 12:31:53
8	Håkon Flatval	330	Haskell	2018-08-30 21:57:20
9	Martin Jackson	338	Haskell	2017-04-12 15:32:15
10	Jan Hrček	342	Haskell	2020-10-24 11:02:19

#	User	Length	Language	Date
1	Prakash Sanyasi	362	Java	2017-06-23 13:14:04
2	Thanh Le	384	Java	2022-12-16 01:23:44
3	Doug Goodman	388	Java	2018-04-08 16:43:56
4	Hidden user	399	Java	2015-02-26 08:31:33
5	Hidden user	413	Java	2014-11-16 12:05:02
6	Stuti Shah	428	Java	2021-09-29 22:44:36
7	Carter Henderson	440	Java	2021-11-17 17:00:47
8	Hamza Raza	442	Java	2016-11-01 22:31:28
9	Pedram Asadzadhe	451	Java	2018-09-27 02:30:02
10	Finn Lidbetter	456	Java	2016-04-05 19:45:10

#	User	Length	Language	Date
1	Hidden user	552	JavaScript (Node.js)	2019-08-09 04:22:54
2	Howard Tin Chi Chan	599	JavaScript (Node.js)	2021-02-13 09:23:54
3	Hovhannes Kantuni	699	JavaScript (Node.js)	2020-10-17 20:15:05
4	Hidden user	702	JavaScript (Node.js)	2024-11-02 18:56:08
5	Gurushant Gurushant	897	JavaScript (Node.js)	2023-05-04 19:41:00
6	Ryoki Kunii	917	JavaScript (Node.js)	2020-10-09 02:15:33
7	John	1050	JavaScript (Node.js)	2020-08-07 09:58:33
8	Andoko Chandra	1086	JavaScript (Node.js)	2020-10-07 15:11:58
9	Michael Zetterholm	1167	JavaScript (Node.js)	2020-09-23 12:25:19
10	Chris Wong	1240	JavaScript (Node.js)	2021-02-06 02:00:41

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	103	JavaScript (SpiderMonkey)	2022-11-10 22:09:36
2	Jimmy Gustafsson	113	JavaScript (SpiderMonkey)	2024-06-16 10:31:48
3	Bjørn Chr. Soltvedt	274	JavaScript (SpiderMonkey)	2016-01-28 01:19:59
4	Zach Tschetter	288	JavaScript (SpiderMonkey)	2025-01-30 23:59:13
5	Evan Magill	386	JavaScript (SpiderMonkey)	2024-04-25 18:24:47
6	Peter Kedemo	409	JavaScript (SpiderMonkey)	2015-12-23 13:10:34
7	J M	482	JavaScript (SpiderMonkey)	2016-11-09 00:41:48
8	Peter Menyes	813	JavaScript (SpiderMonkey)	2021-02-08 20:31:56
9	Nicklas Utgaard	944	JavaScript (SpiderMonkey)	2021-12-23 11:59:12
10	Tor Nordqvist	1530	JavaScript (SpiderMonkey)	2016-11-15 11:14:33

#	User	Length	Language	Date
1	Danny Robinson	82	Julia	2023-06-23 08:07:30
2	Hidden user	90	Julia	2025-03-19 17:38:53
3	Timothy Gaede	952	Julia	2024-03-25 03:19:59

#	User	Length	Language	Date
1	Magnus Tønnessen	321	Kotlin	2022-05-13 12:56:01
2	Albert Pala	371	Kotlin	2021-07-03 22:06:34
3	Adam Rankin	417	Kotlin	2023-05-04 05:14:19
4	Gaurav Tyagi	422	Kotlin	2018-11-21 22:41:58
5	Dayan Ruben Gonzalez	441	Kotlin	2020-09-29 21:10:40
6	Troy Warmboe	539	Kotlin	2020-02-06 23:30:32
7	Sean Hagen	566	Kotlin	2021-08-16 22:30:12
8	Emil Eriksmoen Stensland	624	Kotlin	2021-02-15 00:38:46
9	Aleksander	683	Kotlin	2024-01-02 12:16:40
10	Neil Harmon	807	Kotlin	2019-04-08 13:50:49

#	User	Length	Language	Date
1	Hidden user	340	Odin	2025-05-04 18:49:08

#	User	Length	Language	Date
1	David Connolly	543	Pascal	2022-07-06 13:23:42
2	Ingemar Ragnemalm	1904	Pascal	2018-03-01 21:19:59

#	User	Length	Language	Date
1	Renate Fiala-Lundström	475	PHP	2021-06-27 08:03:44
2	Nick Hargrove	664	PHP	2022-05-19 12:54:07
3	Andre Wahyudi	711	PHP	2022-10-25 06:49:20

#	User	Length	Language	Date
1	Andriy Zyevakov	323	Prolog	2019-05-31 06:32:29
2	Hakan Kjellerstrand	455	Prolog	2023-02-01 10:14:04

#	User	Length	Language	Date
1	Lars Åström	178	Python 2	2019-06-16 21:24:45
2	Seanan Chabra	184	Python 2	2016-11-01 22:40:50
3	Cole Bite	184	Python 2	2017-04-04 20:55:54
4	Thomas Feld	187	Python 2	2019-08-30 08:06:16
5	Erik Odenman	194	Python 2	2015-05-11 21:36:12
6	Stefan Kennedy	205	Python 2	2016-12-22 17:54:10
7	Haggai Liu	205	Python 2	2017-01-19 22:03:37
8	Arne Tobias Malkenes Ødegaard	210	Python 2	2015-12-05 14:54:58
9	Lars Tveito	218	Python 2	2016-04-10 21:09:34
10	Çağdaş Öztekin	231	Python 2	2017-09-06 20:18:37

#	User	Length	Language	Date
1	Kevin Gomez	96	Python 3	2025-05-19 05:45:14
2	Clement Oh	98	Python 3	2023-09-01 14:18:36
3	Benjamin Z White	102	Python 3	2023-04-18 16:22:28
4	Nguyên Khôi Đỗ	113	Python 3	2025-01-09 15:57:25
5	Hidden user	113	Python 3	2025-01-18 22:10:53
6	Alexandre Charland	115	Python 3	2024-09-30 14:47:46
7	Troels Bjerre Lund	121	Python 3	2021-04-15 17:02:39
8	Guk Yi Siong	122	Python 3	2023-06-12 19:21:16
9	David Aldenbro	124	Python 3	2025-02-11 12:02:42
10	Christoph H	124	Python 3	2025-12-12 18:17:01

#	User	Length	Language	Date
1	Jinwoo Lee	312	Racket	2025-01-30 02:26:43

#	User	Length	Language	Date
1	Thomas Feld	54	Ruby	2023-05-15 08:21:56
2	Si Jie Tan	56	Ruby	2026-01-09 05:05:23
3	Alexander Bilde Pedersen	58	Ruby	2023-05-14 21:45:45
4	Ian Steiner	79	Ruby	2024-07-31 17:56:13
5	Yusuke Ichiki	87	Ruby	2022-06-20 17:19:52
6	Casper Christensen	105	Ruby	2016-01-27 12:24:28
7	Hidden user	127	Ruby	2019-10-04 16:16:59
8	Chenzhang Hu	128	Ruby	2025-09-22 14:50:03
9	Clifford Owino	131	Ruby	2017-05-24 10:55:00
10	Eugen Neagoe	137	Ruby	2026-03-16 19:50:12

#	User	Length	Language	Date
1	Emil Dichmann	530	Rust	2025-08-24 12:31:54
2	Kok Dith	568	Rust	2021-08-06 02:18:42
3	Freek van Keulen	617	Rust	2021-07-11 12:43:05
4	David Rasch	626	Rust	2020-09-17 12:58:43
5	David Zacek	640	Rust	2021-05-21 14:31:28
6	Joakim Rastamo	697	Rust	2022-10-05 18:44:07
7	Andriy Semenistiy	793	Rust	2021-01-28 19:18:05
8	Pankajkumar Patro	842	Rust	2024-07-19 20:16:16
9	Albert Rise Nielsen	851	Rust	2020-11-15 21:58:22
10	Nathaniel Risum	862	Rust	2025-09-02 06:46:35

#	User	Length	Language	Date
1	Hidden user	1747	Zig	2025-10-18 09:32:48
2	Grettir Heimisson	2286	Zig	2025-11-11 22:55:49

Solution running time distribution