Problem A
Rings — Problem Statistics

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Submissions	3569
Accepted submissions	1110
Submission ratio	31.10%
Authors	1071
Accepted authors	900
Author ratio	84.03%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.09 s	Bash	2024-04-17 19:19:30

#	User	Runtime	Language	Date
1	William TenHaaf	0.00 s	C	2015-11-04 00:32:40
2	Bergur Snorrason	0.00 s	C	2019-03-14 17:00:20
3	Ivan Petrov	0.00 s	C	2019-07-11 09:01:21
4	Eyleifur Bjarkason	0.00 s	C	2019-12-26 04:24:24
5	Hidden user	0.00 s	C	2024-08-16 01:28:55
6	Aljaz Brodar	0.00 s	C	2025-02-23 21:22:09

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.03 s	C#	2016-03-15 11:03:45
2	samvid mistry	0.06 s	C#	2024-12-25 17:22:05
3	Nathan Andrews	0.09 s	C#	2024-10-24 17:10:39

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Common Lisp	2019-07-19 21:03:51

#	User	Runtime	Language	Date
1	Norbert Voelker	0.02 s	Go	2022-08-24 00:41:36
2	Hidden user	0.03 s	Go	2024-10-02 20:31:37

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.05 s	Java	2025-05-17 21:44:11
2	Michael Sullivan	0.07 s	Java	2016-03-12 02:23:51
3	Hidden user	0.07 s	Java	2016-11-07 21:25:49
4	Martijn Muijsers	0.08 s	Java	2017-03-04 17:10:53
5	Erik Baalhuis	0.08 s	Java	2017-06-06 13:30:58
6	Xingfang Yuan	0.08 s	Java	2017-09-23 18:07:22
7	Caleb Frankenberger	0.08 s	Java	2024-02-08 04:53:28
8	Nick Wu	0.09 s	Java	2015-11-15 03:09:32
9	Aldo Chow	0.09 s	Java	2017-06-16 07:46:17
10	Jerry Zhou	0.09 s	Java	2023-06-08 23:40:19

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2016-11-29 18:06:00
2	Peter Kedemo	0.03 s	JavaScript (SpiderMonkey)	2016-09-11 10:32:06
3	Christian Cederquist	0.07 s	JavaScript (SpiderMonkey)	2023-08-14 23:12:16

#	User	Runtime	Language	Date
1	Timothy Gaede	0.72 s	Julia	2024-08-22 08:03:10

#	User	Runtime	Language	Date
1	Jacob Huebner	0.18 s	Kotlin	2021-07-02 02:06:06
2	Nicholas Johnson	0.20 s	Kotlin	2021-06-30 01:03:46
3	Hidden user	0.21 s	Kotlin	2020-04-11 15:32:20
4	Johnny Baloney	0.31 s	Kotlin	2022-01-02 21:36:30
5	Adam Koprowski	0.35 s	Kotlin	2020-08-19 22:41:24

#	User	Runtime	Language	Date
1	Caleb Austin	0.19 s	Lua	2024-10-27 03:57:36

#	User	Runtime	Language	Date
1	Hermon Mulat	0.04 s	Python 2	2018-01-09 05:44:13
2	Michael Laszlo	0.05 s	Python 2	2017-01-02 05:51:17
3	Trevor Masters	0.06 s	Python 2	2015-11-02 20:06:06
4	Hidden user	0.06 s	Python 2	2015-11-07 03:10:36
5	Andreas Björklund	0.06 s	Python 2	2019-03-29 08:01:37
6	Ted Morin	0.07 s	Python 2	2016-10-08 21:34:05
7	Zheng Dai	0.07 s	Python 2	2016-11-16 22:06:40
8	Thomas Vu	0.07 s	Python 2	2019-02-13 22:31:21
9	blue@macacm.org	0.08 s	Python 2	2016-10-26 00:53:24
10	Yanmarshus Bachtiar	0.08 s	Python 2	2020-10-03 14:43:57

#	User	Runtime	Language	Date
1	Kyle June	0.03 s	Python 3	2016-10-20 22:40:39
2	Brian Bauman	0.03 s	Python 3	2016-10-22 00:51:09
3	Kevin Tang	0.03 s	Python 3	2019-08-02 20:27:30
4	Oliver James Tan	0.04 s	Python 3	2018-04-05 15:58:09
5	James Hamm	0.04 s	Python 3	2018-06-28 17:06:32
6	Bjørn Dons	0.04 s	Python 3	2018-10-17 22:06:51
7	Andrew McGehee	0.04 s	Python 3	2019-01-25 00:28:31
8	Team Seven	0.04 s	Python 3	2019-02-23 21:31:19
9	Alex Lewin	0.04 s	Python 3	2019-02-28 03:32:32
10	Matthew Kan	0.04 s	Python 3	2019-03-18 02:23:58

#	User	Runtime	Language	Date
1	Erik Rydbert	0.14 s	Ruby	2016-08-07 13:06:52

#	User	Runtime	Language	Date
1	Pahlevi Fikri Auliya	0.00 s	Rust	2020-10-25 12:24:52
2	Reis Faar	0.00 s	Rust	2023-05-04 19:00:11
3	Hidden user	0.00 s	Rust	2025-02-05 20:56:24
4	Mckinley Xie	0.00 s	Rust	2025-03-23 03:20:56

#	User	Length	Language	Date
1	Chenzhang Hu	5	Bash	2024-04-17 19:19:30

#	User	Length	Language	Date
1	William TenHaaf	1299	C	2015-11-04 00:32:40
2	Hidden user	1465	C	2024-08-16 01:28:55
3	Ivan Petrov	1816	C	2019-07-11 09:01:21
4	Bergur Snorrason	2916	C	2019-03-14 17:00:20
5	Aljaz Brodar	4249	C	2025-02-23 21:22:09
6	Eyleifur Bjarkason	9613	C	2019-12-26 04:24:24

#	User	Length	Language	Date
1	Nathan Andrews	1627	C#	2024-10-24 17:10:39
2	samvid mistry	2564	C#	2024-12-25 17:22:05
3	Andriy Zyevakov	7031	C#	2016-03-15 11:03:45

#	User	Length	Language	Date
1	Roger Chen	908	C++	2021-08-02 18:36:29
2	bekarhunmain	967	C++	2024-06-05 07:09:58
3	Pakorn Ueareeworakul	988	C++	2018-01-21 10:15:43
4	Duarte Nóbrega	988	C++	2019-02-22 19:55:35
5	Hidden user	1003	C++	2015-10-31 15:52:40
6	Lee Bing Heng	1016	C++	2022-11-22 09:56:08
7	최승주	1019	C++	2016-09-14 15:58:50
8	Brandon Fuller	1036	C++	2016-10-22 17:48:48
9	Hidden user	1042	C++	2023-09-06 11:33:53
10	Mario Tanijaya	1063	C++	2018-03-13 12:48:55

#	User	Length	Language	Date
1	Hidden user	1355	Common Lisp	2019-07-19 21:40:18

#	User	Length	Language	Date
1	Hidden user	1676	Go	2024-10-02 20:31:37
2	Norbert Voelker	1786	Go	2022-08-24 00:45:51

#	User	Length	Language	Date
1	Yeung Man Tsung	1361	Java	2022-06-22 11:47:13
2	Jiru Xu	1401	Java	2016-10-27 23:08:19
3	Frank Luan	1442	Java	2016-10-08 19:41:56
4	Marco Troltsch	1451	Java	2016-07-01 10:59:18
5	Doug Goodman	1553	Java	2017-10-21 20:22:38
6	Qinzhe Liu	1554	Java	2019-02-17 23:34:21
7	Jasper Pillejera	1573	Java	2019-02-03 07:10:48
8	Daniel Wojtowicz	1576	Java	2016-10-08 22:42:44
9	Jacob Burroughs	1577	Java	2016-10-08 19:18:20
10	Hao Ye	1588	Java	2015-11-06 03:30:12

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	1037	JavaScript (SpiderMonkey)	2016-11-29 18:06:00
2	Christian Cederquist	1111	JavaScript (SpiderMonkey)	2023-08-14 23:12:16
3	Peter Kedemo	1366	JavaScript (SpiderMonkey)	2016-09-11 10:32:06

#	User	Length	Language	Date
1	Timothy Gaede	2412	Julia	2024-08-22 08:03:10

#	User	Length	Language	Date
1	Johnny Baloney	1436	Kotlin	2022-01-02 21:46:23
2	Adam Koprowski	2403	Kotlin	2020-08-19 22:41:24
3	Jacob Huebner	2737	Kotlin	2021-07-02 02:06:06
4	Nicholas Johnson	3331	Kotlin	2021-06-30 01:03:46
5	Hidden user	3409	Kotlin	2020-04-11 15:32:20

#	User	Length	Language	Date
1	Caleb Austin	1658	Lua	2024-10-27 03:57:36

#	User	Length	Language	Date
1	Thomas Feld	710	Python 2	2020-08-21 15:18:55
2	Michael Laszlo	921	Python 2	2017-01-02 05:51:17
3	Andreas Björklund	1106	Python 2	2019-03-29 08:01:37
4	Tudor Brindus	1125	Python 2	2016-10-21 23:38:43
5	Thomas Vu	1198	Python 2	2019-02-13 22:31:21
6	Zheng Dai	1275	Python 2	2016-11-16 22:06:40
7	beta@macacm.org	1339	Python 2	2016-10-26 00:42:52
8	Haggai Liu	1343	Python 2	2017-10-29 02:33:54
9	Godmar Back	1408	Python 2	2016-10-09 04:35:46
10	Ted Morin	1484	Python 2	2016-10-08 21:34:05

#	User	Length	Language	Date
1	Benjamin Z White	460	Python 3	2023-07-25 16:46:35
2	Aldo Luna Bueno	502	Python 3	2024-11-01 18:03:48
3	Thibault Raffaillac	685	Python 3	2020-02-07 18:00:11
4	Jason Clarke	727	Python 3	2024-06-08 10:22:54
5	Minh Phan Duc Nhat	740	Python 3	2018-01-22 06:49:29
6	Ahmed Chamseddine	760	Python 3	2025-01-24 21:30:40
7	Carl Agrell	803	Python 3	2016-09-06 14:58:13
8	Robert Nix	806	Python 3	2023-08-18 02:57:53
9	Luke DiGiovanna	823	Python 3	2022-09-24 19:17:34
10	Kevin Lee	841	Python 3	2018-10-17 22:39:27

#	User	Length	Language	Date
1	Erik Rydbert	1515	Ruby	2016-08-07 13:06:52

#	User	Length	Language	Date
1	Mckinley Xie	2547	Rust	2025-03-23 03:20:56
2	Reis Faar	2656	Rust	2023-05-04 19:00:11
3	Pahlevi Fikri Auliya	3102	Rust	2020-10-25 12:24:52
4	Hidden user	4439	Rust	2025-02-05 20:56:24

Solution running time distribution