Problem A
Preludes — Problem Statistics

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Submissions	3592
Accepted submissions	1747
Submission ratio	48.64%
Authors	1672
Full solves [?]	1550
Full solve Ratio	92.70%

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

#	User	Runtime	Language	Date
1	masosz	0.02 s	C#	2015-02-11 16:37:56
2	Mads Storm Hansen	0.02 s	C#	2015-07-18 08:45:44
3	Yuwono Bangun Nagoro	0.02 s	C#	2016-03-23 12:32:00
4	Robert Low	0.02 s	C#	2016-07-16 10:57:19
5	Duelene Olson	0.02 s	C#	2016-08-07 01:36:15
6	Jens Mossig	0.02 s	C#	2017-02-17 23:02:42
7	Khin Nyunt	0.02 s	C#	2017-04-08 15:33:18
8	Viktor Wesström	0.02 s	C#	2017-09-24 13:25:30
9	Ludwig Hedeby	0.02 s	C#	2017-11-30 13:15:34
10	Johan Pettersson	0.02 s	C#	2018-02-09 09:52:43

#	User	Runtime	Language	Date
1	David Cawthon	0.02 s	Common Lisp	2019-05-10 01:42:47

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.05 s	F#	2022-09-13 16:51:18

#	User	Runtime	Language	Date
1	Georgios Leandros Kyriazis	0.02 s	Go	2022-10-06 18:16:53
2	Paul Komkoff	0.08 s	Go	2013-07-02 07:22:40
3	Adam Evans	0.08 s	Go	2016-08-23 12:52:34
4	Norbert Voelker	0.08 s	Go	2021-04-23 13:03:24

#	User	Runtime	Language	Date
1	Boris Minaev	0.05 s	Java	2013-07-02 06:25:05
2	Moisés Amezcua	0.05 s	Java	2013-07-02 21:33:35
3	Erick Alvarez	0.05 s	Java	2013-07-02 22:52:27
4	Hidden user	0.05 s	Java	2015-02-23 18:11:48
5	Nathaniel Lahn	0.05 s	Java	2015-08-10 17:09:40
6	Łukasz Antkowiak	0.05 s	Java	2015-09-13 21:02:11
7	Dennis Ang	0.05 s	Java	2015-09-23 06:22:25
8	Pål Forsberg	0.05 s	Java	2015-10-03 14:48:19
9	Brandon Morris	0.05 s	Java	2015-10-09 02:21:12
10	David Auer	0.05 s	Java	2015-11-26 14:54:46

#	User	Runtime	Language	Date
1	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-04-30 05:34:20
2	Chris Wong	0.41 s	JavaScript (Node.js)	2021-03-04 01:04:30
3	Daniel Cabral	0.42 s	JavaScript (Node.js)	2020-03-26 13:06:59
4	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-11 13:13:14
5	Hovhannes Kantuni	0.42 s	JavaScript (Node.js)	2021-04-22 21:53:31
6	Khin Nyunt	0.42 s	JavaScript (Node.js)	2021-09-25 14:05:28
7	Niamh Limerick	0.42 s	JavaScript (Node.js)	2022-02-14 10:17:06

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-20 16:25:50
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-08 15:57:35
3	Ionel Hindorean	0.01 s	JavaScript (SpiderMonkey)	2016-12-02 12:05:29
4	Peter Menyes	0.01 s	JavaScript (SpiderMonkey)	2017-08-27 08:32:03
5	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-11 22:41:14
6	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-07-19 20:33:00

#	User	Runtime	Language	Date
1	Timothy Gaede	0.56 s	Julia	2024-06-04 05:04:00

#	User	Runtime	Language	Date
1	Ashish Singh	0.13 s	Kotlin	2023-01-27 07:16:02
2	Johnny Baloney	0.15 s	Kotlin	2021-12-01 21:49:32
3	Neil Harmon	0.16 s	Kotlin	2019-05-06 09:34:24
4	Dayan Ruben Gonzalez	0.16 s	Kotlin	2020-09-29 19:39:08
5	Adam Rankin	0.18 s	Kotlin	2023-04-21 19:12:36
6	Emil Wihlander	0.18 s	Kotlin	2023-07-27 13:38:50
7	Alexandre Conte	0.19 s	Kotlin	2021-09-13 20:58:22
8	Troy Warmboe	0.19 s	Kotlin	2023-04-11 22:16:34
9	Max Holmberg	0.19 s	Kotlin	2023-12-31 11:19:44
10	Joakim Argillander	0.20 s	Kotlin	2018-08-05 16:02:19

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-01-15 19:05:17

#	User	Runtime	Language	Date
1	Silvena Lam	0.01 s	PHP	2016-02-12 07:44:56
2	Steven D. Wilson	0.01 s	PHP	2016-11-25 18:51:09
3	Jonas Lindenskov Nielsen	0.01 s	PHP	2019-10-27 16:34:12
4	G V	0.01 s	PHP	2020-01-30 02:03:50
5	Renate	0.01 s	PHP	2023-07-24 22:42:29

#	User	Runtime	Language	Date
1	Hadi Qovaizi	0.01 s	Prolog	2016-05-03 14:15:18

#	User	Runtime	Language	Date
1	Hyun-hwan Jeong	0.02 s	Python 2	2013-07-02 07:19:39
2	Jonas Kylling	0.02 s	Python 2	2015-03-21 19:08:05
3	Christofer Ohlsson	0.02 s	Python 2	2015-04-17 12:22:30
4	Erik Odenman	0.02 s	Python 2	2015-05-10 20:46:18
5	Team Baud	0.02 s	Python 2	2015-09-01 16:12:51
6	Johan Wind	0.02 s	Python 2	2015-09-14 14:53:00
7	Carl Martin Rosenberg	0.02 s	Python 2	2015-09-18 23:06:41
8	Snild Dolkow	0.02 s	Python 2	2015-10-04 10:17:53
9	Asger Hautop Drewsen	0.02 s	Python 2	2015-11-03 20:57:31
10	Alexander Teno	0.02 s	Python 2	2016-02-26 16:48:16

#	User	Runtime	Language	Date
1	Hidden user	0.02 s	Python 3	2013-07-02 09:59:05
2	Hidden user	0.02 s	Python 3	2014-11-13 21:03:10
3	Martin Stensgård	0.02 s	Python 3	2015-03-22 04:06:52
4	James Elías Sigurðarson	0.02 s	Python 3	2015-05-31 21:01:07
5	Johannes Agestam	0.02 s	Python 3	2015-06-17 11:45:11
6	Baldur Tryggvason	0.02 s	Python 3	2015-07-20 15:43:38
7	Arnar Leifsson	0.02 s	Python 3	2015-07-20 22:07:48
8	Eva Debenjak	0.02 s	Python 3	2015-08-06 12:56:05
9	Brian Harrington	0.02 s	Python 3	2015-08-10 12:06:50
10	John Harrison	0.02 s	Python 3	2015-09-18 17:53:00

#	User	Runtime	Language	Date
1	Gerry Hall	0.03 s	Ruby	2016-03-18 04:50:11
2	Lasse Berglund	0.03 s	Ruby	2016-04-21 11:53:27
3	Erik Rydbert	0.03 s	Ruby	2016-07-14 03:02:50
4	Savvas Alexandrou	0.04 s	Ruby	2018-12-15 17:41:14
5	Hidden user	0.04 s	Ruby	2019-03-29 21:13:43
6	Davi Guimarães Leite	0.04 s	Ruby	2019-03-29 21:14:03
7	Hidden user	0.04 s	Ruby	2019-09-30 19:13:43
8	Macdara mac an tSionnaigh	0.04 s	Ruby	2019-09-30 19:19:28
9	Thomas Feld	0.06 s	Ruby	2022-11-25 12:07:38
10	Russell Ng	0.07 s	Ruby	2025-06-04 05:47:39

#	User	Runtime	Language	Date
1	Ștefan-Iulian Alecu	0.04 s	Visual Basic	2025-11-02 19:23:35

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

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

#	User	Length	Language	Date
1	Gregory Sinclair	326	C#	2023-11-14 03:24:33
2	Robert Low	685	C#	2016-07-16 10:57:19
3	Göran Andersson	746	C#	2022-05-14 23:15:15
4	Kunwei Zhang	865	C#	2018-02-14 01:49:51
5	Doug Goodman	997	C#	2018-04-13 21:09:25
6	Eric Weiss	1011	C#	2022-07-29 17:23:59
7	Khin Nyunt	1012	C#	2017-04-08 15:33:18
8	Thomas Norris	1017	C#	2019-10-10 20:52:16
9	Hidden user	1026	C#	2020-12-15 05:44:21
10	Duelene Olson	1195	C#	2016-08-07 01:36:15

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

#	User	Length	Language	Date
1	David Cawthon	795	Common Lisp	2019-05-10 01:42:47

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	949	F#	2022-09-13 16:51:18

#	User	Length	Language	Date
1	Paul Komkoff	622	Go	2013-07-02 07:22:40
2	Adam Evans	802	Go	2016-08-23 12:52:34
3	Norbert Voelker	888	Go	2021-04-23 13:03:24
4	Georgios Leandros Kyriazis	1219	Go	2022-10-06 18:16:53

#	User	Length	Language	Date
1	Lars Corbijn	406	Haskell	2015-12-19 18:45:19
2	Håkon Flatval	459	Haskell	2018-08-31 19:40:16
3	Jan Hlavacek	470	Haskell	2016-11-18 13:08:33
4	Li Jun	470	Haskell	2023-06-27 14:50:35
5	Lars Tveito	474	Haskell	2015-08-18 22:33:50
6	Hidden user	519	Haskell	2019-08-25 09:01:22
7	Brent Yorgey	520	Haskell	2017-10-12 16:41:19
8	Jorge Catarecha	547	Haskell	2017-12-17 00:08:30
9	Steinar Simonnes	548	Haskell	2024-01-31 16:46:54
10	Aaron Lengyel	591	Haskell	2021-11-05 21:21:18

#	User	Length	Language	Date
1	Darrin Wiley	666	Java	2016-01-05 20:16:04
2	Pedro Contipelli	692	Java	2016-06-04 03:14:33
3	Doug Goodman	699	Java	2018-03-30 21:03:32
4	Samuel Klingström	706	Java	2017-03-06 10:58:27
5	Timothy Deutsch	724	Java	2018-11-14 23:43:17
6	Eric Leow Yu Quan	726	Java	2021-01-10 06:01:38
7	Khin Nyunt	732	Java	2017-11-12 14:47:37
8	William Beard	732	Java	2020-11-29 04:42:19
9	Simon Xue	739	Java	2015-11-09 20:16:06
10	Brandon Jimenez	741	Java	2022-04-21 13:22:26

#	User	Length	Language	Date
1	Chris Wong	752	JavaScript (Node.js)	2021-03-04 01:04:30
2	Gurpartap Singh Bhatti	866	JavaScript (Node.js)	2019-04-30 05:38:33
3	Khin Nyunt	903	JavaScript (Node.js)	2021-09-25 15:23:35
4	Daniel Cabral	1087	JavaScript (Node.js)	2020-03-26 13:38:50
5	Andoko Chandra	1113	JavaScript (Node.js)	2020-10-11 13:13:14
6	Hovhannes Kantuni	1347	JavaScript (Node.js)	2021-04-22 21:53:31
7	Niamh Limerick	1424	JavaScript (Node.js)	2022-02-14 10:17:06

#	User	Length	Language	Date
1	Jimmy Gustafsson	168	JavaScript (SpiderMonkey)	2024-07-19 20:33:00
2	Christian Pilegaard Cederquist	310	JavaScript (SpiderMonkey)	2023-01-11 22:41:14
3	Peter Menyes	415	JavaScript (SpiderMonkey)	2017-08-27 08:32:03
4	Peter Kedemo	439	JavaScript (SpiderMonkey)	2015-12-20 16:25:50
5	Bjørn Chr. Soltvedt	498	JavaScript (SpiderMonkey)	2016-02-08 15:57:35
6	Ionel Hindorean	637	JavaScript (SpiderMonkey)	2016-12-02 12:05:29

#	User	Length	Language	Date
1	Timothy Gaede	432	Julia	2024-06-04 05:04:00

#	User	Length	Language	Date
1	Cheatahh	479	Kotlin	2025-04-29 14:06:26
2	Emil Wihlander	559	Kotlin	2023-07-27 13:38:50
3	Dayan Ruben Gonzalez	583	Kotlin	2020-09-29 19:39:08
4	Alexandre Conte	589	Kotlin	2021-09-13 20:58:22
5	Troy Warmboe	596	Kotlin	2023-04-11 22:16:34
6	Max Holmberg	667	Kotlin	2023-12-31 11:19:44
7	Einar Kjellback	714	Kotlin	2019-12-16 10:24:01
8	Ashish Singh	729	Kotlin	2023-01-27 07:16:02
9	Eric Huynh	880	Kotlin	2019-02-01 17:34:40
10	Joakim Argillander	957	Kotlin	2018-08-05 16:02:19

#	User	Length	Language	Date
1	Ingemar Ragnemalm	512	Pascal	2018-01-15 19:05:17

#	User	Length	Language	Date
1	Renate	493	PHP	2023-07-24 22:42:29
2	Jonas Lindenskov Nielsen	497	PHP	2019-10-27 16:34:12
3	G V	733	PHP	2020-01-30 02:03:50
4	Silvena Lam	750	PHP	2016-02-12 07:44:56
5	Steven D. Wilson	830	PHP	2016-11-25 18:51:09

#	User	Length	Language	Date
1	Hadi Qovaizi	18549	Prolog	2016-05-03 14:15:18

#	User	Length	Language	Date
1	Thomas Feld	241	Python 2	2019-09-03 12:52:52
2	Jesper Öqvist	308	Python 2	2018-10-21 09:15:24
3	Conor McCauley	322	Python 2	2019-10-30 16:04:53
4	Andreas Björklund	329	Python 2	2021-04-01 13:47:17
5	Erik Odenman	331	Python 2	2015-05-10 20:46:18
6	Asger Hautop Drewsen	347	Python 2	2015-11-03 20:57:31
7	Yanmarshus Bachtiar	375	Python 2	2019-10-28 07:46:27
8	Muzakhir Amanzholov	377	Python 2	2017-02-07 20:08:52
9	Snild Dolkow	389	Python 2	2015-10-04 10:29:55
10	Jonas Kylling	390	Python 2	2015-03-21 19:08:05

#	User	Length	Language	Date
1	Nguyên Khôi Đỗ	172	Python 3	2025-05-26 22:09:53
2	Guk Yi Siong	187	Python 3	2023-07-30 04:08:30
3	Tai Tze Kin	190	Python 3	2024-05-02 21:00:25
4	Ahmed Chamseddine	205	Python 3	2024-07-30 10:57:30
5	Hidden user	218	Python 3	2025-12-05 01:15:59
6	Charles Ancheta	236	Python 3	2023-04-12 06:49:47
7	Harry Zhang	242	Python 3	2023-01-03 13:30:01
8	Timothy Baeckelant	261	Python 3	2024-05-26 01:54:32
9	Frank Shin	266	Python 3	2021-05-29 17:31:25
10	Sean Gee	275	Python 3	2020-12-18 20:00:00

#	User	Length	Language	Date
1	Thomas Feld	115	Ruby	2022-11-25 12:07:38
2	Russell Ng	128	Ruby	2025-06-04 05:54:26
3	Hidden user	346	Ruby	2019-09-30 19:13:43
4	Gerry Hall	392	Ruby	2016-03-18 04:50:11
5	Lasse Berglund	486	Ruby	2016-04-21 11:53:27
6	Erik Rydbert	525	Ruby	2016-07-14 03:02:50
7	Macdara mac an tSionnaigh	543	Ruby	2019-09-30 19:19:28
8	Hidden user	631	Ruby	2019-03-29 21:13:43
9	Davi Guimarães Leite	631	Ruby	2019-03-29 21:14:03
10	Savvas Alexandrou	675	Ruby	2018-12-15 17:41:14

#	User	Length	Language	Date
1	David Rasch	648	Rust	2024-01-09 12:33:10
2	Artur Khuziakhmetov	731	Rust	2025-01-16 14:12:34
3	Kok Dith	857	Rust	2021-08-15 12:42:45
4	Pankajkumar Patro	923	Rust	2024-11-02 16:00:35
5	Isak Jägberg	1013	Rust	2024-10-24 11:55:47
6	jaswanth	1115	Rust	2024-03-12 13:56:01
7	Evelyn May	1186	Rust	2020-01-25 21:29:26
8	Bas Dirks	1189	Rust	2022-01-04 10:46:04
9	Robert Janczewski	1191	Rust	2020-02-09 20:51:50
10	Christofer Nolander	1225	Rust	2018-11-16 07:08:06

#	User	Length	Language	Date
1	Ștefan-Iulian Alecu	835	Visual Basic	2025-11-02 19:23:35

Solution running time distribution