Problem A
Preludes — Problem Statistics

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Submissions	3628
Accepted submissions	1767
Submission ratio	48.70%
Authors	1690
Full solves [?]	1568
Full solve Ratio	92.78%

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-09-26 11:13:40

#	User	Runtime	Language	Date
1	masosz	0.02 s	C#	2015-02-11 17:37:56
2	Mads Storm Hansen	0.02 s	C#	2015-07-18 10:45:44
3	Yuwono Bangun Nagoro	0.02 s	C#	2016-03-23 13:32:00
4	Robert Low	0.02 s	C#	2016-07-16 12:57:19
5	Duelene Olson	0.02 s	C#	2016-08-07 03:36:15
6	Jens Mossig	0.02 s	C#	2017-02-18 00:02:42
7	Khin Nyunt	0.02 s	C#	2017-04-08 17:33:18
8	Viktor Wesström	0.02 s	C#	2017-09-24 15:25:30
9	Ludwig Hedeby	0.02 s	C#	2017-11-30 14:15:34
10	Johan Pettersson	0.02 s	C#	2018-02-09 10:52:43

#	User	Runtime	Language	Date
1	David Cawthon	0.02 s	Common Lisp	2019-05-10 03:42:47

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.05 s	F#	2022-09-13 18:51:18

#	User	Runtime	Language	Date
1	Georgios Leandros Kyriazis	0.02 s	Go	2022-10-06 20:16:53
2	Paul Komkoff	0.08 s	Go	2013-07-02 09:22:40
3	Adam Evans	0.08 s	Go	2016-08-23 14:52:34
4	Norbert Voelker	0.08 s	Go	2021-04-23 15:03:24

#	User	Runtime	Language	Date
1	Boris Minaev	0.05 s	Java	2013-07-02 08:25:05
2	Moisés Amezcua	0.05 s	Java	2013-07-02 23:33:35
3	Erick Alvarez	0.05 s	Java	2013-07-03 00:52:27
4	Hidden user	0.05 s	Java	2015-02-23 19:11:48
5	Nathaniel Lahn	0.05 s	Java	2015-08-10 19:09:40
6	Łukasz Antkowiak	0.05 s	Java	2015-09-13 23:02:11
7	Dennis Ang	0.05 s	Java	2015-09-23 08:22:25
8	Pål Forsberg	0.05 s	Java	2015-10-03 16:48:19
9	Brandon Morris	0.05 s	Java	2015-10-09 04:21:12
10	David Auer	0.05 s	Java	2015-11-26 15:54:46

#	User	Runtime	Language	Date
1	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-04-30 07:34:20
2	Chris Wong	0.41 s	JavaScript (Node.js)	2021-03-04 02:04:30
3	Daniel Cabral	0.42 s	JavaScript (Node.js)	2020-03-26 14:06:59
4	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-11 15:13:14
5	Hovhannes Kantuni	0.42 s	JavaScript (Node.js)	2021-04-22 23:53:31
6	Khin Nyunt	0.42 s	JavaScript (Node.js)	2021-09-25 16:05:28
7	Niamh Limerick	0.42 s	JavaScript (Node.js)	2022-02-14 11:17:06

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-20 17:25:50
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-08 16:57:35
3	Ionel Hindorean	0.01 s	JavaScript (SpiderMonkey)	2016-12-02 13:05:29
4	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-27 10:32:03
5	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-11 23:41:14
6	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-07-19 22:33:00

#	User	Runtime	Language	Date
1	Timothy Gaede	0.56 s	Julia	2024-06-04 07:04:00

#	User	Runtime	Language	Date
1	Ashish Singh	0.13 s	Kotlin	2023-01-27 08:16:02
2	Johnny Baloney	0.15 s	Kotlin	2021-12-01 22:49:32
3	Neil Harmon	0.16 s	Kotlin	2019-05-06 11:34:24
4	Dayan Ruben Gonzalez	0.16 s	Kotlin	2020-09-29 21:39:08
5	Adam Rankin	0.18 s	Kotlin	2023-04-21 21:12:36
6	Emil Wihlander	0.18 s	Kotlin	2023-07-27 15:38:50
7	Alexandre Conte	0.19 s	Kotlin	2021-09-13 22:58:22
8	Troy Warmboe	0.19 s	Kotlin	2023-04-12 00:16:34
9	Max Holmberg	0.19 s	Kotlin	2023-12-31 12:19:44
10	Joakim Argillander	0.20 s	Kotlin	2018-08-05 18:02:19

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-01-15 20:05:17

#	User	Runtime	Language	Date
1	Denis BAURAIN	0.00 s	Perl	2026-01-28 22:15:19

#	User	Runtime	Language	Date
1	Silvena Lam	0.01 s	PHP	2016-02-12 08:44:56
2	Steven D. Wilson	0.01 s	PHP	2016-11-25 19:51:09
3	Jonas Lindenskov Nielsen	0.01 s	PHP	2019-10-27 17:34:12
4	G V	0.01 s	PHP	2020-01-30 03:03:50
5	Renate Fiala-Lundström	0.01 s	PHP	2023-07-25 00:42:29

#	User	Runtime	Language	Date
1	Hadi Qovaizi	0.01 s	Prolog	2016-05-03 16:15:18

#	User	Runtime	Language	Date
1	Hyun-hwan Jeong	0.02 s	Python 2	2013-07-02 09:19:39
2	Jonas Kylling	0.02 s	Python 2	2015-03-21 20:08:05
3	Christofer Ohlsson	0.02 s	Python 2	2015-04-17 14:22:30
4	Erik Odenman	0.02 s	Python 2	2015-05-10 22:46:18
5	Team Baud	0.02 s	Python 2	2015-09-01 18:12:51
6	Johan Wind	0.02 s	Python 2	2015-09-14 16:53:00
7	Carl Martin Rosenberg	0.02 s	Python 2	2015-09-19 01:06:41
8	Snild Dolkow	0.02 s	Python 2	2015-10-04 12:17:53
9	Asger Hautop Drewsen	0.02 s	Python 2	2015-11-03 21:57:31
10	Alexander Teno	0.02 s	Python 2	2016-02-26 17:48:16

#	User	Runtime	Language	Date
1	Hidden user	0.02 s	Python 3	2013-07-02 11:59:05
2	Hidden user	0.02 s	Python 3	2014-11-13 22:03:10
3	Martin Stensgård	0.02 s	Python 3	2015-03-22 05:06:52
4	James Elías Sigurðarson	0.02 s	Python 3	2015-05-31 23:01:07
5	Johannes Agestam	0.02 s	Python 3	2015-06-17 13:45:11
6	Baldur Tryggvason	0.02 s	Python 3	2015-07-20 17:43:38
7	Arnar Leifsson	0.02 s	Python 3	2015-07-21 00:07:48
8	Eva Debenjak	0.02 s	Python 3	2015-08-06 14:56:05
9	Brian Harrington	0.02 s	Python 3	2015-08-10 14:06:50
10	John Harrison	0.02 s	Python 3	2015-09-18 19:53:00

#	User	Runtime	Language	Date
1	Gerry Hall	0.03 s	Ruby	2016-03-18 05:50:11
2	Lasse Berglund	0.03 s	Ruby	2016-04-21 13:53:27
3	Erik Rydbert	0.03 s	Ruby	2016-07-14 05:02:50
4	Savvas Alexandrou	0.04 s	Ruby	2018-12-15 18:41:14
5	Hidden user	0.04 s	Ruby	2019-03-29 22:13:43
6	Davi Guimarães Leite	0.04 s	Ruby	2019-03-29 22:14:03
7	Hidden user	0.04 s	Ruby	2019-09-30 21:13:43
8	Macdara mac an tSionnaigh	0.04 s	Ruby	2019-09-30 21:19:28
9	Thomas Feld	0.06 s	Ruby	2022-11-25 13:07:38
10	Russell Ng	0.07 s	Ruby	2025-06-04 07:47:39

#	User	Runtime	Language	Date
1	Ștefan-Iulian Alecu	0.04 s	Visual Basic	2025-11-02 20:23:35

#	User	Length	Language	Date
1	Danny Robinson	142	Bash	2023-09-26 11:13:40

#	User	Length	Language	Date
1	Matthew Weston	429	C	2022-03-06 15:52:05
2	Ximun Castoreo	523	C	2023-12-13 11:15:53
3	Albin Sellergren	540	C	2018-09-24 07:37:30
4	Ng Wei Jie	616	C	2020-02-18 17:55:47
5	Leslie Yip	629	C	2022-08-15 16:50:40
6	Dhairya Patel	643	C	2020-07-14 08:47:19
7	Thomas	648	C	2018-09-10 12:53:20
8	Jón Steinn Elíasson	649	C	2017-04-26 21:18:21
9	Blue Panda	649	C	2020-11-09 08:46:09
10	a_b__c	649	C	2021-02-02 16:51:35

#	User	Length	Language	Date
1	Gregory Sinclair	326	C#	2023-11-14 04:24:33
2	Robert Low	685	C#	2016-07-16 12:57:19
3	Göran Andersson	746	C#	2022-05-15 01:15:15
4	Kunwei Zhang	865	C#	2018-02-14 02:49:51
5	Doug Goodman	997	C#	2018-04-13 23:09:25
6	Eric Weiss	1011	C#	2022-07-29 19:23:59
7	Khin Nyunt	1012	C#	2017-04-08 17:33:18
8	Thomas Norris	1017	C#	2019-10-10 22:52:16
9	Hidden user	1026	C#	2020-12-15 06:44:21
10	Lukas P.	1027	C#	2026-02-26 18:54:40

#	User	Length	Language	Date
1	Mugeon Kim	284	C++	2024-01-27 03:58:43
2	Richard Putra	305	C++	2018-02-20 07:07:10
3	Antonio Molina Lovett	344	C++	2016-08-06 20:37:03
4	Herman Karlsson	367	C++	2015-02-12 22:20:09
5	Ralf Merhof	381	C++	2024-03-24 21:18:33
6	Le Heng Chieu	389	C++	2017-08-30 10:51:31
7	Aidan Smith	426	C++	2018-01-22 07:07:30
8	Kaifei Chen	428	C++	2013-07-02 08:07:54
9	Budi Arbenta	434	C++	2017-01-27 09:55:41
10	Jerome Leow	436	C++	2020-12-23 13:59:56

#	User	Length	Language	Date
1	David Cawthon	795	Common Lisp	2019-05-10 03:42:47

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	949	F#	2022-09-13 18:51:18

#	User	Length	Language	Date
1	Paul Komkoff	622	Go	2013-07-02 09:22:40
2	Adam Evans	802	Go	2016-08-23 14:52:34
3	Norbert Voelker	888	Go	2021-04-23 15:03:24
4	Georgios Leandros Kyriazis	1219	Go	2022-10-06 20:16:53

#	User	Length	Language	Date
1	Lars Corbijn	406	Haskell	2015-12-19 19:45:19
2	Håkon Flatval	459	Haskell	2018-08-31 21:40:16
3	Jan Hlavacek	470	Haskell	2016-11-18 14:08:33
4	Li Jun	470	Haskell	2023-06-27 16:50:35
5	Lars Tveito	474	Haskell	2015-08-19 00:33:50
6	Hidden user	519	Haskell	2019-08-25 11:01:22
7	Brent Yorgey	520	Haskell	2017-10-12 18:41:19
8	Jorge Catarecha	547	Haskell	2017-12-17 01:08:30
9	Steinar Simonnes	548	Haskell	2024-01-31 17:46:54
10	Aaron Lengyel	591	Haskell	2021-11-05 22:21:18

#	User	Length	Language	Date
1	Darrin Wiley	666	Java	2016-01-05 21:16:04
2	Pedro Contipelli	692	Java	2016-06-04 05:14:33
3	Doug Goodman	699	Java	2018-03-30 23:03:32
4	Samuel Klingström	706	Java	2017-03-06 11:58:27
5	Timothy Deutsch	724	Java	2018-11-15 00:43:17
6	Eric Leow Yu Quan	726	Java	2021-01-10 07:01:38
7	Khin Nyunt	732	Java	2017-11-12 15:47:37
8	William Beard	732	Java	2020-11-29 05:42:19
9	Simon Xue	739	Java	2015-11-09 21:16:06
10	Brandon Jimenez	741	Java	2022-04-21 15:22:26

#	User	Length	Language	Date
1	Chris Wong	752	JavaScript (Node.js)	2021-03-04 02:04:30
2	Gurpartap Singh Bhatti	866	JavaScript (Node.js)	2019-04-30 07:38:33
3	Khin Nyunt	903	JavaScript (Node.js)	2021-09-25 17:23:35
4	Daniel Cabral	1087	JavaScript (Node.js)	2020-03-26 14:38:50
5	Andoko Chandra	1113	JavaScript (Node.js)	2020-10-11 15:13:14
6	Hovhannes Kantuni	1347	JavaScript (Node.js)	2021-04-22 23:53:31
7	Niamh Limerick	1424	JavaScript (Node.js)	2022-02-14 11:17:06

#	User	Length	Language	Date
1	Jimmy Gustafsson	168	JavaScript (SpiderMonkey)	2024-07-19 22:33:00
2	Christian Pilegaard Cederquist	310	JavaScript (SpiderMonkey)	2023-01-11 23:41:14
3	Peter Menyes	415	JavaScript (SpiderMonkey)	2017-08-27 10:32:03
4	Peter Kedemo	439	JavaScript (SpiderMonkey)	2015-12-20 17:25:50
5	Bjørn Chr. Soltvedt	498	JavaScript (SpiderMonkey)	2016-02-08 16:57:35
6	Ionel Hindorean	637	JavaScript (SpiderMonkey)	2016-12-02 13:05:29

#	User	Length	Language	Date
1	Timothy Gaede	432	Julia	2024-06-04 07:04:00

#	User	Length	Language	Date
1	Cheatahh	479	Kotlin	2025-04-29 16:06:26
2	Emil Wihlander	559	Kotlin	2023-07-27 15:38:50
3	Dayan Ruben Gonzalez	583	Kotlin	2020-09-29 21:39:08
4	Alexandre Conte	589	Kotlin	2021-09-13 22:58:22
5	Troy Warmboe	596	Kotlin	2023-04-12 00:16:34
6	Max Holmberg	667	Kotlin	2023-12-31 12:19:44
7	Einar Kjellback	714	Kotlin	2019-12-16 11:24:01
8	Ashish Singh	729	Kotlin	2023-01-27 08:16:02
9	Eric Huynh	880	Kotlin	2019-02-01 18:34:40
10	Joakim Argillander	957	Kotlin	2018-08-05 18:02:19

#	User	Length	Language	Date
1	Ingemar Ragnemalm	512	Pascal	2018-01-15 20:05:17

#	User	Length	Language	Date
1	Denis BAURAIN	150	Perl	2026-01-29 13:40:55

#	User	Length	Language	Date
1	Renate Fiala-Lundström	493	PHP	2023-07-25 00:42:29
2	Jonas Lindenskov Nielsen	497	PHP	2019-10-27 17:34:12
3	G V	733	PHP	2020-01-30 03:03:50
4	Silvena Lam	750	PHP	2016-02-12 08:44:56
5	Steven D. Wilson	830	PHP	2016-11-25 19:51:09

#	User	Length	Language	Date
1	Hadi Qovaizi	18549	Prolog	2016-05-03 16:15:18

#	User	Length	Language	Date
1	Thomas Feld	241	Python 2	2019-09-03 14:52:52
2	Jesper Öqvist	308	Python 2	2018-10-21 11:15:24
3	Conor McCauley	322	Python 2	2019-10-30 17:04:53
4	Andreas Björklund	329	Python 2	2021-04-01 15:47:17
5	Erik Odenman	331	Python 2	2015-05-10 22:46:18
6	Asger Hautop Drewsen	347	Python 2	2015-11-03 21:57:31
7	Yanmarshus Bachtiar	375	Python 2	2019-10-28 08:46:27
8	Muzakhir Amanzholov	377	Python 2	2017-02-07 21:08:52
9	Snild Dolkow	389	Python 2	2015-10-04 12:29:55
10	Jonas Kylling	390	Python 2	2015-03-21 20:08:05

#	User	Length	Language	Date
1	Nguyên Khôi Đỗ	172	Python 3	2025-05-27 00:09:53
2	Guk Yi Siong	187	Python 3	2023-07-30 06:08:30
3	Tai Tze Kin	190	Python 3	2024-05-02 23:00:25
4	Ahmed Chamseddine	205	Python 3	2024-07-30 12:57:30
5	Hidden user	218	Python 3	2025-12-05 02:15:59
6	Charles Ancheta	236	Python 3	2023-04-12 08:49:47
7	Harry Zhang	242	Python 3	2023-01-03 14:30:01
8	Timothy Baeckelant	261	Python 3	2024-05-26 03:54:32
9	Frank Shin	266	Python 3	2021-05-29 19:31:25
10	Sean Gee	275	Python 3	2020-12-18 21:00:00

#	User	Length	Language	Date
1	Thomas Feld	115	Ruby	2022-11-25 13:07:38
2	Russell Ng	128	Ruby	2025-06-04 07:54:26
3	Hidden user	346	Ruby	2019-09-30 21:13:43
4	Gerry Hall	392	Ruby	2016-03-18 05:50:11
5	Lasse Berglund	486	Ruby	2016-04-21 13:53:27
6	Erik Rydbert	525	Ruby	2016-07-14 05:02:50
7	Macdara mac an tSionnaigh	543	Ruby	2019-09-30 21:19:28
8	Hidden user	631	Ruby	2019-03-29 22:13:43
9	Davi Guimarães Leite	631	Ruby	2019-03-29 22:14:03
10	Savvas Alexandrou	675	Ruby	2018-12-15 18:41:14

#	User	Length	Language	Date
1	David Rasch	648	Rust	2024-01-09 13:33:10
2	Artur Khuziakhmetov	731	Rust	2025-01-16 15:12:34
3	Kok Dith	857	Rust	2021-08-15 14:42:45
4	Pankajkumar Patro	923	Rust	2024-11-02 17:00:35
5	Isak Jägberg	1013	Rust	2024-10-24 13:55:47
6	jaswanth	1115	Rust	2024-03-12 14:56:01
7	Evelyn May	1186	Rust	2020-01-25 22:29:26
8	Bas Dirks	1189	Rust	2022-01-04 11:46:04
9	Robert Janczewski	1191	Rust	2020-02-09 21:51:50
10	Christofer Nolander	1225	Rust	2018-11-16 08:08:06

#	User	Length	Language	Date
1	Ștefan-Iulian Alecu	835	Visual Basic	2025-11-02 20:23:35

Solution running time distribution