Problem A
Prsteni — Problem Statistics

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Submissions	5059
Accepted submissions	3020
Submission ratio	59.70%
Authors	2856
Full solves [?]	2710
Full solve Ratio	94.89%

#	User	Runtime	Language	Date
1	Stefan Baumann	0.01 s	APL	2023-05-15 10:50:39

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.03 s	Bash	2023-10-10 15:51:44

#	User	Runtime	Language	Date
1	masosz	0.02 s	C#	2015-02-17 22:20:09
2	Mads Storm Hansen	0.02 s	C#	2015-07-17 22:50:59
3	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-06-13 17:26:21
4	Robert Low	0.02 s	C#	2016-07-18 17:05:04
5	Ugnius Skučas	0.02 s	C#	2016-10-15 13:13:20
6	Hidden user	0.02 s	C#	2017-04-22 12:12:15
7	Rasmus Brants	0.02 s	C#	2017-05-29 12:02:56
8	Þorsteinn Þorvaldsson	0.02 s	C#	2017-06-04 15:45:36
9	Johan Pettersson	0.02 s	C#	2018-04-12 14:02:07
10	Дмитро Рудий	0.02 s	C#	2018-04-20 22:51:48

#	User	Runtime	Language	Date
1	Kevin Gomez	0.01 s	Common Lisp	2025-05-19 07:50:15
2	David Cawthon	0.02 s	Common Lisp	2019-05-04 01:40:58

#	User	Runtime	Language	Date
1	Sebastian Sternberg	0.04 s	F#	2021-09-13 18:27:06
2	Jacob Harris Cryer Kragh	0.04 s	F#	2022-06-23 19:19:04
3	Patrick Bahr	0.05 s	F#	2021-02-21 14:35:30
4	Morten Clausen	0.08 s	F#	2020-07-31 23:51:37
5	Peter Iatsenia	0.08 s	F#	2026-02-11 15:57:34

#	User	Runtime	Language	Date
1	Romario HUAMANI PACCAYA	0.00 s	Go	2025-08-31 19:13:05
2	Jimmy Nejtron	0.08 s	Go	2020-09-24 16:39:46
3	Norbert Voelker	0.08 s	Go	2021-04-14 16:28:11
4	Krzysztof Gibuła	0.08 s	Go	2021-05-09 22:40:39
5	Yudit Yudiarto	0.08 s	Go	2021-09-19 14:46:16

#	User	Runtime	Language	Date
1	Simon Klein	0.05 s	Java	2011-12-14 19:35:21
2	Aked Hindi	0.05 s	Java	2013-02-05 16:55:23
3	Łukasz Antkowiak	0.05 s	Java	2015-09-13 10:54:38
4	Hidden user	0.05 s	Java	2015-09-16 07:54:41
5	Michael Sullivan	0.05 s	Java	2015-09-16 16:11:05
6	Nick Wu	0.05 s	Java	2015-10-08 01:08:01
7	Michel Langeveld	0.05 s	Java	2015-12-06 22:24:36
8	Hidden user	0.05 s	Java	2016-05-21 12:51:33
9	Martijn Muijsers	0.05 s	Java	2016-10-01 15:58:20
10	William Brigham	0.05 s	Java	2017-04-19 03:09:24

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	JavaScript (Node.js)	2024-11-02 04:30:11
2	Gurushant Gurushant	0.09 s	JavaScript (Node.js)	2023-05-04 21:41:00
3	Hidden user	0.40 s	JavaScript (Node.js)	2019-08-09 06:22:54
4	John	0.42 s	JavaScript (Node.js)	2020-08-07 11:58:33
5	Michael Zetterholm	0.42 s	JavaScript (Node.js)	2020-09-23 14:25:19
6	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-07 17:11:58
7	Ryoki Kunii	0.42 s	JavaScript (Node.js)	2020-10-09 04:15:33
8	Chris Wong	0.42 s	JavaScript (Node.js)	2021-02-06 03:00:41
9	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-02-13 10:23:54
10	Hovhannes Kantuni	0.43 s	JavaScript (Node.js)	2020-10-17 22:15:05

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-23 14:10:34
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-01-28 02:19:59
3	J M	0.01 s	JavaScript (SpiderMonkey)	2016-11-09 01:41:48
4	Tor Nordqvist	0.01 s	JavaScript (SpiderMonkey)	2016-11-15 12:14:33
5	Nicklas Utgaard	0.02 s	JavaScript (SpiderMonkey)	2021-12-23 12:59:12
6	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2022-11-10 22:40:36
7	Evan Magill	0.02 s	JavaScript (SpiderMonkey)	2024-04-25 20:24:47
8	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-06-16 12:30:55
9	Zach Tschetter	0.02 s	JavaScript (SpiderMonkey)	2025-01-31 00:59:13
10	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-02-08 21:31:56

#	User	Runtime	Language	Date
1	Hidden user	0.40 s	Julia	2025-03-19 18:22:00
2	Danny Robinson	0.65 s	Julia	2023-06-23 10:07:30
3	Timothy Gaede	0.71 s	Julia	2024-03-25 04:19:59

#	User	Runtime	Language	Date
1	Emil Eriksmoen Stensland	0.15 s	Kotlin	2021-02-15 01:38:46
2	Gaurav Tyagi	0.16 s	Kotlin	2018-11-21 23:41:58
3	Dayan Ruben Gonzalez	0.16 s	Kotlin	2020-09-29 23:10:40
4	Adam Rankin	0.18 s	Kotlin	2023-05-04 07:14:19
5	Neil Harmon	0.20 s	Kotlin	2019-04-08 15:50:49
6	Adam Koprowski	0.20 s	Kotlin	2021-05-05 08:53:13
7	Albert Pala	0.20 s	Kotlin	2021-07-04 00:06:34
8	Sean Hagen	0.20 s	Kotlin	2021-08-17 00:30:12
9	Magnus Tønnessen	0.20 s	Kotlin	2022-05-13 14:56:01
10	Aleksander	0.21 s	Kotlin	2024-01-02 13:16:40

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Odin	2025-05-04 20:49:08

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-03-01 22:19:59
2	David Connolly	0.00 s	Pascal	2022-07-06 15:23:42

#	User	Runtime	Language	Date
1	Renate Fiala-Lundström	0.01 s	PHP	2021-06-27 10:03:44
2	Nick Hargrove	0.01 s	PHP	2022-05-19 14:54:07
3	Andre Wahyudi	0.01 s	PHP	2022-10-25 08:49:20

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.01 s	Prolog	2019-05-31 08:32:29
2	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-01 11:14:04

#	User	Runtime	Language	Date
1	Urban Pettersson	0.02 s	Python 2	2016-01-22 17:06:16
2	Çağdaş Öztekin	0.02 s	Python 2	2017-09-06 22:18:37
3	Nicholas Joaquin	0.02 s	Python 2	2017-12-31 08:23:58
4	Andrei Stoica	0.02 s	Python 2	2018-05-14 23:29:41
5	Kristmundur Agust	0.03 s	Python 2	2015-03-04 23:31:19
6	Christofer Ohlsson	0.03 s	Python 2	2015-05-08 21:25:36
7	Erik Odenman	0.03 s	Python 2	2015-05-11 23:36:12
8	Snild Dolkow	0.03 s	Python 2	2015-09-13 13:53:50
9	Arne Tobias Malkenes Ødegaard	0.03 s	Python 2	2015-12-05 15:54:58
10	Alexander Teno	0.03 s	Python 2	2016-03-22 22:04:52

#	User	Runtime	Language	Date
1	John Harrison	0.02 s	Python 3	2015-09-16 22:21:05
2	Kent Tsuenchy	0.02 s	Python 3	2016-01-27 06:12:52
3	Terrence Reilly	0.02 s	Python 3	2016-02-25 16:39:09
4	Lucia Pál (Simanová)	0.02 s	Python 3	2016-06-23 00:54:37
5	Drew Lytle	0.02 s	Python 3	2016-09-26 22:28:36
6	Christian Lindeström	0.02 s	Python 3	2016-10-04 14:36:57
7	Joey Chan	0.02 s	Python 3	2016-11-02 00:36:54
8	Carlos Alvarado	0.02 s	Python 3	2016-12-03 05:49:01
9	Rick May	0.02 s	Python 3	2017-03-01 19:43:43
10	Ionel Hindorean	0.02 s	Python 3	2017-03-13 22:06:49

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.13 s	Racket	2025-01-30 03:26:43

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-01-27 13:24:28
2	Clifford Owino	0.03 s	Ruby	2017-05-24 12:55:00
3	노승현	0.04 s	Ruby	2019-05-15 16:44:55
4	Hidden user	0.04 s	Ruby	2019-10-04 18:16:59
5	Hadi Qovaizi	0.05 s	Ruby	2021-08-12 13:03:18
6	Yusuke Ichiki	0.05 s	Ruby	2022-06-20 19:19:52
7	Thomas Feld	0.06 s	Ruby	2022-11-07 09:48:55
8	Alexander Bilde Pedersen	0.06 s	Ruby	2023-05-14 23:45:45
9	Ian Steiner	0.06 s	Ruby	2024-07-31 19:53:26
10	Pratham Patel	0.06 s	Ruby	2025-02-10 17:19:10

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Zig	2025-10-18 11:32:48
2	Grettir Heimisson	0.00 s	Zig	2025-11-11 23:55:49

#	User	Length	Language	Date
1	Stefan Baumann	66	APL	2023-05-15 10:50:39

#	User	Length	Language	Date
1	Chenzhang Hu	32	Bash	2025-09-13 02:05:36

#	User	Length	Language	Date
1	Martin Blom	140	C	2023-10-16 22:39:22
2	Mouad Naciri	263	C	2017-04-02 22:27:20
3	Ximun Castoreo	282	C	2020-07-21 11:56:02
4	Drake Packard	296	C	2018-03-07 00:42:38
5	Mai Tuyết	337	C	2024-07-27 10:23:01
6	Matthew Weston	343	C	2022-01-03 18:38:16
7	이정섭	348	C	2022-12-27 13:06:40
8	Sebastian Weiermann	350	C	2017-07-23 18:24:30
9	andromeda378	350	C	2023-12-11 19:34:08
10	Saskia Scholz	356	C	2023-05-04 08:29:00

#	User	Length	Language	Date
1	Julia Duffy	439	C#	2026-03-18 00:46:28
2	Esty Crow	507	C#	2022-12-14 22:19:11
3	Leslie Yip	533	C#	2022-07-05 16:03:01
4	Thomas Norris	594	C#	2019-06-24 19:26:13
5	Deci Bel	609	C#	2025-08-10 10:52:10
6	Umar Rasyid	626	C#	2025-04-09 01:08:35
7	Kunwei Zhang	627	C#	2018-06-09 06:51:24
8	Anthony Ye	641	C#	2022-12-18 18:43:12
9	Jens Erik	685	C#	2025-11-20 01:07:54
10	Simon Thillemann Nielsen	685	C#	2025-11-20 01:08:15

#	User	Length	Language	Date
1	Frans Meulenbroeks	129	C++	2024-10-15 18:53:36
2	a_b__c	143	C++	2021-08-17 19:50:59
3	Đậu Huy Minh	181	C++	2022-10-13 06:01:27
4	Irawan Tanudirdjo	190	C++	2025-07-28 03:42:53
5	Richard Putra	194	C++	2018-02-20 07:13:12
6	Scott MacIntosh	197	C++	2019-11-06 04:05:34
7	Zane Yu	200	C++	2018-12-31 14:11:25
8	evan	200	C++	2025-09-26 11:39:45
9	Ernest Ng Zi Xuan	201	C++	2025-06-26 03:50:36
10	Yeung Man Tsung	210	C++	2022-11-20 08:47:06

#	User	Length	Language	Date
1	Kevin Gomez	89	Common Lisp	2025-05-19 07:50:15
2	David Cawthon	383	Common Lisp	2019-05-04 01:40:58

#	User	Length	Language	Date
1	Morten Clausen	455	F#	2020-07-31 23:51:37
2	Peter Iatsenia	457	F#	2026-02-11 15:57:34
3	Sebastian Sternberg	487	F#	2021-09-13 18:27:06
4	Jacob Harris Cryer Kragh	516	F#	2022-06-23 19:19:04
5	Patrick Bahr	2033	F#	2021-02-21 14:35:30

#	User	Length	Language	Date
1	Romario HUAMANI PACCAYA	632	Go	2025-08-31 19:13:05
2	Yudit Yudiarto	698	Go	2021-09-19 14:46:16
3	Krzysztof Gibuła	712	Go	2021-05-09 22:40:39
4	Norbert Voelker	826	Go	2021-04-14 16:28:11
5	Jimmy Nejtron	947	Go	2020-09-24 16:39:46

#	User	Length	Language	Date
1	Sebastian Banert	168	Haskell	2023-04-22 13:29:15
2	Llaurence Git	231	Haskell	2018-11-07 13:21:59
3	Anthony Clark	254	Haskell	2017-04-11 22:07:17
4	Jan Hlavacek	293	Haskell	2016-12-08 01:55:26
5	Hidden user	295	Haskell	2019-08-14 13:30:37
6	Rafał Gwoździński	310	Haskell	2021-03-17 21:06:20
7	Shinji Koshida	314	Haskell	2025-02-27 13:31:53
8	Håkon Flatval	330	Haskell	2018-08-30 23:57:20
9	Martin Jackson	338	Haskell	2017-04-12 17:32:15
10	Jan Hrček	342	Haskell	2020-10-24 13:02:19

#	User	Length	Language	Date
1	Prakash Sanyasi	362	Java	2017-06-23 15:14:04
2	Thanh Le	384	Java	2022-12-16 02:23:44
3	Doug Goodman	388	Java	2018-04-08 18:43:56
4	Hidden user	399	Java	2015-02-26 09:31:33
5	Hidden user	413	Java	2014-11-16 13:05:02
6	Stuti Shah	428	Java	2021-09-30 00:44:36
7	Carter Henderson	440	Java	2021-11-17 18:00:47
8	Hamza Raza	442	Java	2016-11-01 23:31:28
9	Pedram Asadzadhe	451	Java	2018-09-27 04:30:02
10	Finn Lidbetter	456	Java	2016-04-05 21:45:10

#	User	Length	Language	Date
1	Hidden user	552	JavaScript (Node.js)	2019-08-09 06:22:54
2	Howard Tin Chi Chan	599	JavaScript (Node.js)	2021-02-13 10:23:54
3	Hovhannes Kantuni	699	JavaScript (Node.js)	2020-10-17 22:15:05
4	Hidden user	702	JavaScript (Node.js)	2024-11-02 19:56:08
5	Gurushant Gurushant	897	JavaScript (Node.js)	2023-05-04 21:41:00
6	Ryoki Kunii	917	JavaScript (Node.js)	2020-10-09 04:15:33
7	John	1050	JavaScript (Node.js)	2020-08-07 11:58:33
8	Andoko Chandra	1086	JavaScript (Node.js)	2020-10-07 17:11:58
9	Michael Zetterholm	1167	JavaScript (Node.js)	2020-09-23 14:25:19
10	Chris Wong	1240	JavaScript (Node.js)	2021-02-06 03:00:41

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	103	JavaScript (SpiderMonkey)	2022-11-10 23:09:36
2	Jimmy Gustafsson	113	JavaScript (SpiderMonkey)	2024-06-16 12:31:48
3	Bjørn Chr. Soltvedt	274	JavaScript (SpiderMonkey)	2016-01-28 02:19:59
4	Zach Tschetter	288	JavaScript (SpiderMonkey)	2025-01-31 00:59:13
5	Evan Magill	386	JavaScript (SpiderMonkey)	2024-04-25 20:24:47
6	Peter Kedemo	409	JavaScript (SpiderMonkey)	2015-12-23 14:10:34
7	J M	482	JavaScript (SpiderMonkey)	2016-11-09 01:41:48
8	Peter Menyes	813	JavaScript (SpiderMonkey)	2021-02-08 21:31:56
9	Nicklas Utgaard	944	JavaScript (SpiderMonkey)	2021-12-23 12:59:12
10	Tor Nordqvist	1530	JavaScript (SpiderMonkey)	2016-11-15 12:14:33

#	User	Length	Language	Date
1	Danny Robinson	82	Julia	2023-06-23 10:07:30
2	Hidden user	90	Julia	2025-03-19 18:38:53
3	Timothy Gaede	952	Julia	2024-03-25 04:19:59

#	User	Length	Language	Date
1	Magnus Tønnessen	321	Kotlin	2022-05-13 14:56:01
2	Albert Pala	371	Kotlin	2021-07-04 00:06:34
3	Adam Rankin	417	Kotlin	2023-05-04 07:14:19
4	Gaurav Tyagi	422	Kotlin	2018-11-21 23:41:58
5	Dayan Ruben Gonzalez	441	Kotlin	2020-09-29 23:10:40
6	Troy Warmboe	539	Kotlin	2020-02-07 00:30:32
7	Sean Hagen	566	Kotlin	2021-08-17 00:30:12
8	Emil Eriksmoen Stensland	624	Kotlin	2021-02-15 01:38:46
9	Aleksander	683	Kotlin	2024-01-02 13:16:40
10	Neil Harmon	807	Kotlin	2019-04-08 15:50:49

#	User	Length	Language	Date
1	Hidden user	340	Odin	2025-05-04 20:49:08

#	User	Length	Language	Date
1	David Connolly	543	Pascal	2022-07-06 15:23:42
2	Ingemar Ragnemalm	1904	Pascal	2018-03-01 22:19:59

#	User	Length	Language	Date
1	Renate Fiala-Lundström	475	PHP	2021-06-27 10:03:44
2	Nick Hargrove	664	PHP	2022-05-19 14:54:07
3	Andre Wahyudi	711	PHP	2022-10-25 08:49:20

#	User	Length	Language	Date
1	Andriy Zyevakov	323	Prolog	2019-05-31 08:32:29
2	Hakan Kjellerstrand	455	Prolog	2023-02-01 11:14:04

#	User	Length	Language	Date
1	Lars Åström	178	Python 2	2019-06-16 23:24:45
2	Seanan Chabra	184	Python 2	2016-11-01 23:40:50
3	Cole Bite	184	Python 2	2017-04-04 22:55:54
4	Thomas Feld	187	Python 2	2019-08-30 10:06:16
5	Erik Odenman	194	Python 2	2015-05-11 23:36:12
6	Stefan Kennedy	205	Python 2	2016-12-22 18:54:10
7	Haggai Liu	205	Python 2	2017-01-19 23:03:37
8	Arne Tobias Malkenes Ødegaard	210	Python 2	2015-12-05 15:54:58
9	Lars Tveito	218	Python 2	2016-04-10 23:09:34
10	Çağdaş Öztekin	231	Python 2	2017-09-06 22:18:37

#	User	Length	Language	Date
1	Kevin Gomez	96	Python 3	2025-05-19 07:45:14
2	Clement Oh	98	Python 3	2023-09-01 16:18:36
3	Benjamin Z White	102	Python 3	2023-04-18 18:22:28
4	Nguyên Khôi Đỗ	113	Python 3	2025-01-09 16:57:25
5	Hidden user	113	Python 3	2025-01-18 23:10:53
6	Alexandre Charland	115	Python 3	2024-09-30 16:47:46
7	Troels Bjerre Lund	121	Python 3	2021-04-15 19:02:39
8	Guk Yi Siong	122	Python 3	2023-06-12 21:21:16
9	David Aldenbro	124	Python 3	2025-02-11 13:02:42
10	Christoph H	124	Python 3	2025-12-12 19:17:01

#	User	Length	Language	Date
1	Jinwoo Lee	312	Racket	2025-01-30 03:26:43

#	User	Length	Language	Date
1	Thomas Feld	54	Ruby	2023-05-15 10:21:56
2	Si Jie Tan	56	Ruby	2026-01-09 06:05:23
3	Alexander Bilde Pedersen	58	Ruby	2023-05-14 23:45:45
4	Ian Steiner	79	Ruby	2024-07-31 19:56:13
5	Yusuke Ichiki	87	Ruby	2022-06-20 19:19:52
6	Casper Christensen	105	Ruby	2016-01-27 13:24:28
7	Hidden user	127	Ruby	2019-10-04 18:16:59
8	Chenzhang Hu	128	Ruby	2025-09-22 16:50:03
9	Clifford Owino	131	Ruby	2017-05-24 12:55:00
10	Eugen Neagoe	137	Ruby	2026-03-16 20:50:12

#	User	Length	Language	Date
1	Emil Dichmann	530	Rust	2025-08-24 14:31:54
2	Kok Dith	568	Rust	2021-08-06 04:18:42
3	Freek van Keulen	617	Rust	2021-07-11 14:43:05
4	David Rasch	626	Rust	2020-09-17 14:58:43
5	David Zacek	640	Rust	2021-05-21 16:31:28
6	Joakim Rastamo	697	Rust	2022-10-05 20:44:07
7	Andriy Semenistiy	793	Rust	2021-01-28 20:18:05
8	Pankajkumar Patro	842	Rust	2024-07-19 22:16:16
9	Albert Rise Nielsen	851	Rust	2020-11-15 22:58:22
10	Nathaniel Risum	862	Rust	2025-09-02 08:46:35

#	User	Length	Language	Date
1	Hidden user	1747	Zig	2025-10-18 11:32:48
2	Grettir Heimisson	2286	Zig	2025-11-11 23:55:49

Solution running time distribution