Problem A
Early Winter — Problem Statistics

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Submissions	4068
Accepted submissions	2093
Submission ratio	51.45%
Authors	1934
Full solves [?]	1812
Full solve Ratio	93.69%

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-11-23 09:38:04

#	User	Runtime	Language	Date
1	Øyvind Skaar	0.02 s	C#	2018-12-13 22:36:04
2	Thomas Norris	0.02 s	C#	2020-01-08 15:23:40
3	Amanda Christensen	0.02 s	C#	2020-11-27 15:25:53
4	Thomas Hoffmann Kilbak	0.02 s	C#	2020-11-27 17:12:35
5	Kristoffer Højelse	0.02 s	C#	2020-12-30 16:00:22
6	Hidden user	0.02 s	C#	2021-02-01 12:16:38
7	Sebastian Sternberg	0.02 s	C#	2021-02-19 18:25:31
8	Ben-Richard Ebbesvik	0.02 s	C#	2022-02-20 13:15:14
9	Peter Løffmann	0.02 s	C#	2022-04-30 14:00:33
10	Maria Spencer	0.02 s	C#	2023-02-14 13:09:01

#	User	Runtime	Language	Date
1	David Cawthon	0.01 s	Common Lisp	2020-09-12 15:22:37
2	Hugo Sansaqua	0.01 s	Common Lisp	2020-11-27 15:07:14
3	Hidden user	0.02 s	Common Lisp	2019-06-07 20:23:06

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.04 s	F#	2022-06-16 16:53:59

#	User	Runtime	Language	Date
1	n k	0.00 s	Go	2025-01-14 13:42:23
2	Ståle Jacobsen	0.07 s	Go	2022-01-19 18:53:23
3	Ian Howell	0.08 s	Go	2019-09-30 17:37:57
4	Norbert Voelker	0.08 s	Go	2021-04-26 10:30:53
5	Jack Kryger Sørensen	0.08 s	Go	2022-01-19 16:47:16

#	User	Runtime	Language	Date
1	Brandon Tang	0.00 s	Haskell	2022-06-15 09:48:26
2	Sebastian Banert	0.00 s	Haskell	2023-10-05 18:14:14
3	Steinar Simonnes	0.00 s	Haskell	2024-01-26 10:55:48
4	Gustav Kristensen	0.00 s	Haskell	2025-11-28 15:54:02
5	Brent Yorgey	0.01 s	Haskell	2018-10-28 19:32:14
6	Zach Tschetter	0.01 s	Haskell	2019-04-15 02:03:20
7	Jan Hrček	0.01 s	Haskell	2019-04-28 17:01:22
8	Christos Kontas	0.01 s	Haskell	2019-07-01 13:10:00
9	Aurélien Pepin	0.01 s	Haskell	2019-07-30 16:24:05
10	Hidden user	0.01 s	Haskell	2019-09-04 13:43:29

#	User	Runtime	Language	Date
1	Anh Mai Le Xuan	0.05 s	Java	2018-10-27 18:04:54
2	Dante Bencivenga	0.05 s	Java	2018-10-27 18:11:27
3	Hidden user	0.05 s	Java	2018-10-28 16:41:39
4	Sơn Phạm Huỳnh	0.05 s	Java	2018-10-29 03:53:54
5	Nam Phan Thành	0.05 s	Java	2018-10-29 03:55:52
6	Phụng Nguyễn Long Kim	0.05 s	Java	2018-10-29 08:13:08
7	Vinh Nguyễn Quang	0.05 s	Java	2018-10-29 08:22:12
8	Ariana Herbst	0.05 s	Java	2018-10-29 17:39:42
9	Lee Chun Yat	0.05 s	Java	2018-12-14 05:21:55
10	José Vander Meulen	0.05 s	Java	2018-12-14 15:05:48

#	User	Runtime	Language	Date
1	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-04-13 04:34:00
2	Sander Hellesø	0.05 s	JavaScript (Node.js)	2019-05-01 20:49:09
3	John	0.09 s	JavaScript (Node.js)	2022-07-16 05:54:55
4	Antonia Sisneros	0.09 s	JavaScript (Node.js)	2022-12-08 18:12:40
5	Peter Kedemo	0.41 s	JavaScript (Node.js)	2019-12-27 23:08:07
6	Chris Wong	0.42 s	JavaScript (Node.js)	2021-03-07 20:45:01
7	Andoko Chandra	0.43 s	JavaScript (Node.js)	2020-10-12 11:35:40

#	User	Runtime	Language	Date
1	Nguyễn Hùng Cường	0.02 s	JavaScript (SpiderMonkey)	2018-10-29 08:29:56
2	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2018-10-29 21:04:22
3	Peter Menyes	0.02 s	JavaScript (SpiderMonkey)	2021-08-29 12:50:24
4	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-10 09:50:25
5	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-07-19 17:40:01

#	User	Runtime	Language	Date
1	Timothy Gaede	0.52 s	Julia	2024-04-02 02:54:14
2	Danny Robinson	0.68 s	Julia	2023-11-23 09:31:56

#	User	Runtime	Language	Date
1	Benjamin Ye	0.14 s	Kotlin	2023-01-09 20:52:02
2	Zhengqing Ye	0.15 s	Kotlin	2018-10-27 18:22:40
3	Ola Sundell	0.15 s	Kotlin	2018-12-03 12:37:52
4	Hidden user	0.16 s	Kotlin	2019-12-03 10:35:53
5	Ahmed Waseem Saeed	0.16 s	Kotlin	2021-12-17 23:53:02
6	Emil Wihlander	0.18 s	Kotlin	2023-07-27 09:47:22
7	Sergey Jakobsen	0.19 s	Kotlin	2021-06-08 15:57:38
8	Adam Rankin	0.19 s	Kotlin	2023-08-25 17:10:02
9	Neil Harmon	0.20 s	Kotlin	2019-05-16 08:14:08
10	Dmitry Shostak	0.21 s	Kotlin	2019-09-14 06:31:26

#	User	Runtime	Language	Date
1	Matthew Lutze	0.00 s	OCaml	2020-06-14 00:35:00

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2019-07-06 11:29:37

#	User	Runtime	Language	Date
1	cojonas1	0.01 s	PHP	2021-02-09 14:38:41
2	陳建宏	0.01 s	PHP	2021-05-29 17:55:16
3	April Clark	0.01 s	PHP	2021-10-24 20:31:02
4	Renate Fiala-Lundström	0.01 s	PHP	2022-07-06 22:35:45
5	Andre Wahyudi	0.01 s	PHP	2023-03-17 08:12:15
6	Susanne Ragnemalm	0.01 s	PHP	2024-03-29 14:07:44

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.01 s	Prolog	2019-05-02 06:27:55
2	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-23 19:00:31

#	User	Runtime	Language	Date
1	Godmar Back	0.03 s	Python 2	2018-10-27 18:09:48
2	Hidden user	0.03 s	Python 2	2018-10-27 18:15:08
3	Ethan Arnold	0.03 s	Python 2	2018-10-27 18:15:15
4	Jesper Öqvist	0.03 s	Python 2	2018-10-29 10:11:22
5	Johann Ly	0.03 s	Python 2	2018-10-30 07:09:42
6	Akil Hamilton	0.03 s	Python 2	2018-11-03 19:36:58
7	Michael Le	0.03 s	Python 2	2018-11-03 19:38:59
8	Max Holmberg	0.03 s	Python 2	2018-11-09 07:55:16
9	Maj Stenmark	0.03 s	Python 2	2018-11-15 08:29:28
10	Måns Magnusson	0.03 s	Python 2	2018-11-20 22:44:28

#	User	Runtime	Language	Date
1	Daniel DeLayo	0.02 s	Python 3	2018-10-27 18:05:11
2	Jacob Reckhard	0.02 s	Python 3	2018-10-27 18:05:27
3	Noah Gergel	0.02 s	Python 3	2018-10-27 18:06:46
4	Leo Gao	0.02 s	Python 3	2018-10-27 18:08:49
5	Jesse Ventura	0.02 s	Python 3	2018-10-27 18:09:23
6	Josip Smolcic	0.02 s	Python 3	2018-10-27 18:10:24
7	Hung Nguyen	0.02 s	Python 3	2018-10-27 18:12:57
8	Marcus Boay	0.02 s	Python 3	2018-10-27 18:14:54
9	Vlad Vladov	0.02 s	Python 3	2018-10-27 18:15:06
10	Victor Zheng	0.02 s	Python 3	2018-10-27 18:16:14

#	User	Runtime	Language	Date
1	Miorel Palii	0.04 s	Ruby	2018-11-03 21:28:30
2	Kok Dith	0.05 s	Ruby	2021-08-18 07:35:25
3	Thomas Feld	0.06 s	Ruby	2022-11-15 09:56:59
4	Ivy Wang	0.06 s	Ruby	2023-01-10 01:14:57

#	User	Runtime	Language	Date
1	Soren Basnet	0.04 s	TypeScript	2025-05-16 04:02:18

#	User	Length	Language	Date
1	Danny Robinson	132	Bash	2023-11-23 09:56:22

#	User	Length	Language	Date
1	Eduardo Núñez	182	C	2024-02-27 22:32:17
2	Martin Blom	194	C	2024-01-04 19:35:57
3	Matthew Weston	255	C	2022-01-28 14:11:49
4	Andrew Roberts	305	C	2019-06-03 23:23:32
5	Sambit Palit	328	C	2020-10-18 03:06:34
6	Mirel Cosulschi	330	C	2024-09-24 11:41:33
7	Tyler Mulholland	336	C	2019-07-25 09:08:38
8	Leo Chen	345	C	2019-04-27 02:41:47
9	Zach Robertson	346	C	2024-02-13 03:51:14
10	Matthew Hartono	351	C	2022-09-12 13:22:21

#	User	Length	Language	Date
1	Gregory Sinclair	278	C#	2023-12-16 20:25:07
2	Göran Andersson	583	C#	2022-05-10 23:23:49
3	Peter Løffmann	609	C#	2022-04-30 14:00:33
4	Thomas Norris	644	C#	2020-01-08 15:23:40
5	Thobias Larsen	661	C#	2023-05-08 18:04:29
6	Hidden user	688	C#	2021-02-01 12:17:26
7	Umar Rasyid	724	C#	2025-02-01 16:11:32
8	Sebastian Sternberg	800	C#	2021-02-19 18:25:31
9	Ben-Richard Ebbesvik	812	C#	2022-02-20 13:15:14
10	Mikael Fiala-Lundström	859	C#	2021-04-17 20:24:10

#	User	Length	Language	Date
1	Guk Yi Siong	209	C++	2023-06-13 06:02:00
2	Tyler Fernando	213	C++	2022-11-08 02:40:37
3	Hakan Kjellerstrand	220	C++	2025-02-21 08:48:22
4	Zane Yu	267	C++	2019-01-10 13:00:57
5	Way Tan	269	C++	2019-02-27 05:31:25
6	Mohammad Sadeghi	272	C++	2019-07-11 03:57:52
7	Đậu Huy Minh	274	C++	2022-11-12 04:54:44
8	William Gan	286	C++	2018-12-06 14:33:56
9	Grae Yeandle	287	C++	2018-12-31 10:47:17
10	Hidden user	290	C++	2020-01-27 16:41:47

#	User	Length	Language	Date
1	Hidden user	227	Common Lisp	2019-06-07 20:23:06
2	David Cawthon	395	Common Lisp	2020-09-12 15:22:37
3	Hugo Sansaqua	2850	Common Lisp	2020-11-27 15:07:14

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	380	F#	2022-06-16 16:53:59

#	User	Length	Language	Date
1	Jack Kryger Sørensen	348	Go	2022-01-19 16:47:16
2	Ian Howell	433	Go	2019-09-30 17:37:57
3	Ståle Jacobsen	605	Go	2022-01-19 18:53:23
4	n k	744	Go	2025-01-14 13:42:23
5	Norbert Voelker	887	Go	2021-04-26 10:30:53

#	User	Length	Language	Date
1	Steinar Simonnes	264	Haskell	2024-01-26 10:55:48
2	Zach Tschetter	292	Haskell	2019-04-15 02:03:20
3	Sebastian Banert	316	Haskell	2023-10-05 18:14:14
4	Gustav Kristensen	358	Haskell	2025-11-28 15:54:02
5	Jan Hrček	371	Haskell	2019-04-28 17:01:22
6	Bo Aanes	428	Haskell	2022-01-18 14:52:56
7	Brent Yorgey	433	Haskell	2018-10-28 19:32:14
8	Aurélien Pepin	455	Haskell	2019-07-30 16:24:05
9	Christos Kontas	462	Haskell	2019-07-01 13:10:00
10	Brandon Tang	510	Haskell	2022-06-15 09:48:26

#	User	Length	Language	Date
1	Jenny Le	410	Java	2018-10-27 18:53:39
2	Olivia Bizimungu	424	Java	2019-10-09 00:52:36
3	Jason Liu	437	Java	2023-05-13 19:18:01
4	Åke Wettergren	447	Java	2018-11-21 12:08:08
5	Nam Phan Thành	448	Java	2018-10-29 03:53:43
6	Ali Pervaiz	460	Java	2019-03-25 15:01:48
7	Cole Adams	463	Java	2018-10-27 18:12:40
8	Caeden Whitaker	466	Java	2020-07-22 04:16:07
9	Joseph Dyer	473	Java	2018-10-27 18:16:26
10	Tom Houben	476	Java	2018-12-17 14:45:39

#	User	Length	Language	Date
1	Peter Kedemo	473	JavaScript (Node.js)	2019-12-27 23:08:07
2	Chris Wong	511	JavaScript (Node.js)	2021-03-07 20:45:01
3	Antonia Sisneros	610	JavaScript (Node.js)	2022-12-08 18:12:40
4	Gurpartap Singh Bhatti	720	JavaScript (Node.js)	2019-04-13 04:34:00
5	Andoko Chandra	769	JavaScript (Node.js)	2020-10-12 11:35:40
6	Sander Hellesø	787	JavaScript (Node.js)	2019-05-01 20:49:09
7	John	863	JavaScript (Node.js)	2022-07-16 05:54:55

#	User	Length	Language	Date
1	Jimmy Gustafsson	174	JavaScript (SpiderMonkey)	2024-07-19 17:40:01
2	Nguyễn Hùng Cường	272	JavaScript (SpiderMonkey)	2018-10-29 08:29:56
3	Peter Menyes	319	JavaScript (SpiderMonkey)	2021-08-29 12:54:52
4	Bjørn Chr. Soltvedt	332	JavaScript (SpiderMonkey)	2018-10-29 21:04:22
5	Christian Pilegaard Cederquist	347	JavaScript (SpiderMonkey)	2023-01-10 09:50:25

#	User	Length	Language	Date
1	Danny Robinson	166	Julia	2023-11-23 09:31:56
2	Timothy Gaede	847	Julia	2024-04-02 02:54:14

#	User	Length	Language	Date
1	Adam Rankin	335	Kotlin	2023-08-25 17:10:02
2	Sergey Jakobsen	339	Kotlin	2021-06-08 15:57:38
3	Troy Warmboe	357	Kotlin	2020-02-18 23:00:48
4	Dmitry Shostak	358	Kotlin	2019-09-14 06:31:26
5	Emil Wihlander	363	Kotlin	2023-07-27 09:47:22
6	Benjamin Ye	422	Kotlin	2023-01-09 20:52:02
7	Ola Sundell	524	Kotlin	2018-12-03 12:37:52
8	Zhengqing Ye	539	Kotlin	2018-10-27 18:22:40
9	Ahmed Waseem Saeed	582	Kotlin	2021-12-17 23:53:02
10	Hidden user	712	Kotlin	2019-12-03 10:35:53

#	User	Length	Language	Date
1	Matthew Lutze	700	OCaml	2020-06-14 00:35:00

#	User	Length	Language	Date
1	Ingemar Ragnemalm	328	Pascal	2019-07-06 11:29:37

#	User	Length	Language	Date
1	April Clark	357	PHP	2021-10-24 20:31:02
2	Renate Fiala-Lundström	374	PHP	2022-07-06 22:35:45
3	cojonas1	496	PHP	2021-02-09 14:38:41
4	Andre Wahyudi	765	PHP	2023-03-17 08:12:15
5	Susanne Ragnemalm	829	PHP	2024-03-29 14:07:44
6	陳建宏	1280	PHP	2021-05-29 17:55:16

#	User	Length	Language	Date
1	Hakan Kjellerstrand	436	Prolog	2023-02-23 19:00:31
2	Andriy Zyevakov	481	Prolog	2019-05-02 06:27:55

#	User	Length	Language	Date
1	Thomas Feld	220	Python 2	2019-09-10 07:57:13
2	Lars Åström	221	Python 2	2018-11-21 12:05:15
3	Björn Magnusson	221	Python 2	2018-11-21 17:01:56
4	Hidden user	226	Python 2	2018-10-27 18:15:08
5	Jesper Öqvist	231	Python 2	2018-10-29 10:11:22
6	Måns Magnusson	237	Python 2	2018-11-20 22:44:28
7	Max Holmberg	242	Python 2	2018-11-09 07:55:16
8	Michael Le	245	Python 2	2018-11-03 19:38:59
9	Andreas Björklund	252	Python 2	2019-09-19 20:02:55
10	Godmar Back	265	Python 2	2018-10-27 18:09:48

#	User	Length	Language	Date
1	Benjamin Z White	155	Python 3	2023-05-17 12:09:52
2	Nguyên Khôi Đỗ	168	Python 3	2024-12-23 20:54:07
3	Kévin Dubrulle	177	Python 3	2024-11-17 14:09:07
4	Ahmed Chamseddine	182	Python 3	2024-07-22 13:56:38
5	Shashank Bhatt	183	Python 3	2024-08-26 16:22:53
6	Thibault Raffaillac	185	Python 3	2023-08-01 13:37:20
7	Adam Levav	189	Python 3	2023-01-24 18:35:32
8	Charles Ancheta	195	Python 3	2023-03-25 19:56:34
9	Harry Zhang	197	Python 3	2022-12-13 15:27:35
10	Mikael Häglund	198	Python 3	2022-12-02 22:30:09

#	User	Length	Language	Date
1	Thomas Feld	120	Ruby	2022-11-15 09:56:59
2	Miorel Palii	231	Ruby	2018-11-03 21:28:30
3	Kok Dith	246	Ruby	2021-08-18 07:35:25
4	Ivy Wang	267	Ruby	2023-01-14 07:39:25

#	User	Length	Language	Date
1	Vincent Lagerros	447	Rust	2025-06-20 21:49:21
2	Pankajkumar Patro	556	Rust	2024-09-15 21:43:28
3	Hidden user	643	Rust	2025-12-14 01:52:20
4	David Rasch	674	Rust	2022-06-22 14:57:20
5	Adam Vandolder	683	Rust	2019-07-10 05:01:00
6	Thobias Larsen	726	Rust	2023-01-28 15:25:28
7	Isak Jägberg	767	Rust	2024-10-21 11:17:09
8	Rolf Martin Glomsrud	778	Rust	2022-01-17 18:25:19
9	Jianghua Wang	797	Rust	2023-01-09 23:01:43
10	Eric Pinter	1086	Rust	2021-11-16 02:39:03

#	User	Length	Language	Date
1	Soren Basnet	866	TypeScript	2025-05-16 04:02:18

Solution running time distribution