Problem A
Chess Tournament — Problem Statistics

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Submissions	1046
Accepted submissions	342
Submission ratio	32.70%
Authors	315
Accepted authors	249
Author ratio	79.05%

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	C	2024-01-21 12:22:45
2	Ivan Petrov	0.06 s	C	2019-07-09 16:50:55
3	Alexander Bilde Pedersen	0.06 s	C	2025-03-21 20:47:06
4	Bernd Schmidt	0.13 s	C	2017-05-13 04:44:47

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.01 s	C++	2017-12-04 10:06:09
2	Hidden user	0.02 s	C++	2019-08-03 16:40:42
3	Muhamad Affan	0.02 s	C++	2020-07-16 02:37:39
4	Ben Wu	0.02 s	C++	2021-11-17 21:34:29
5	Mark Wong Tau Yew	0.03 s	C++	2019-12-03 09:29:48
6	Eyleifur Bjarkason	0.03 s	C++	2025-07-23 19:45:42
7	Ludo Pulles	0.04 s	C++	2016-11-22 14:53:11
8	Steven Halim	0.04 s	C++	2018-07-18 09:27:48
9	Asger Hautop Drewsen	0.04 s	C++	2018-09-24 09:19:37
10	André Amaral de Sousa	0.04 s	C++	2018-11-08 21:20:07

#	User	Runtime	Language	Date
1	Crystal Sharpe	0.17 s	Java	2020-06-20 05:45:42
2	José Vander Meulen	0.21 s	Java	2018-12-25 20:05:08
3	Bjørn Dons	0.21 s	Java	2023-05-17 21:10:36
4	William Brigham	0.32 s	Java	2018-03-08 22:09:36
5	Tyler VanHaren	0.40 s	Java	2018-03-08 22:01:36
6	Jeroen Bransen	0.41 s	Java	2017-09-15 16:43:47
7	Brent Yorgey	0.41 s	Java	2021-04-24 13:13:17
8	Noah Goldsmid	0.42 s	Java	2018-09-22 15:47:28
9	Erik Baalhuis	0.43 s	Java	2017-08-25 19:06:58
10	William Fiset	0.44 s	Java	2016-11-05 19:19:23

#	User	Runtime	Language	Date
1	Christian Cederquist	0.31 s	JavaScript (SpiderMonkey)	2023-05-09 23:51:59

#	User	Runtime	Language	Date
1	Phường Lên	0.73 s	Kotlin	2020-04-28 04:35:02
2	Hidden user	0.80 s	Kotlin	2020-04-12 04:52:50

#	User	Runtime	Language	Date
1	Andreas Björklund	0.16 s	Python 2	2020-08-24 18:29:47
2	Haochen Chen	0.28 s	Python 2	2016-11-05 19:35:19
3	Lars Åström	0.29 s	Python 2	2019-04-25 21:15:40
4	Måns Magnusson	0.29 s	Python 2	2019-04-26 12:19:42
5	Adriaan de Vries	0.43 s	Python 2	2016-12-18 01:06:35
6	Olav Røthe Bakken	0.62 s	Python 2	2020-03-03 13:08:57

#	User	Runtime	Language	Date
1	Oskar Haarklou Veileborg	0.19 s	Python 3	2022-02-10 19:25:44
2	Duoduo Zhao	0.22 s	Python 3	2025-07-12 21:02:21
3	Hidden user	0.29 s	Python 3	2025-07-24 04:09:17
4	James Cheng	0.30 s	Python 3	2024-10-15 06:50:15
5	Alessandro Della Flora	0.31 s	Python 3	2024-04-20 17:13:57
6	Nishikar Paruchuri	0.31 s	Python 3	2024-10-15 06:44:45
7	Nicholas Russell Saerang	0.32 s	Python 3	2022-03-25 01:43:47
8	Kadriye Yildiz	0.33 s	Python 3	2024-08-22 20:27:18
9	Orn Arnaldsson	0.35 s	Python 3	2025-07-24 16:43:21
10	Ivan	0.36 s	Python 3	2024-05-03 12:44:07

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.01 s	Rust	2025-08-09 23:38:58
2	Daniel Anker Hermansen	0.05 s	Rust	2023-08-23 16:05:27
3	Hidden user	0.19 s	Rust	2024-06-21 17:43:30

#	User	Length	Language	Date
1	Ivan Petrov	1819	C	2019-07-09 16:50:55
2	Hidden user	2317	C	2024-01-21 12:22:45
3	Bernd Schmidt	4313	C	2017-05-13 04:44:47
4	Alexander Bilde Pedersen	8618	C	2025-03-21 20:47:06

#	User	Length	Language	Date
1	Teikn Smith	799	C++	2024-08-02 08:28:28
2	Jan Elffers	907	C++	2019-06-24 10:51:36
3	Frederick Pek	1102	C++	2021-12-13 20:15:02
4	Andreas Grigorjew	1105	C++	2019-02-15 02:08:38
5	Alexander Skidanov	1121	C++	2024-11-08 22:54:21
6	Dragos Neghina	1176	C++	2020-08-15 16:56:27
7	Hidden user	1192	C++	2020-03-04 22:23:05
8	Ragur Krishnan	1196	C++	2019-06-06 08:57:13
9	Evan Michael Bailey	1215	C++	2023-07-29 19:52:43
10	Shoiab A W Mohammed	1217	C++	2022-02-14 22:09:27

#	User	Length	Language	Date
1	Ronald Rojas	1919	Java	2017-07-17 18:30:02
2	Jeroen Bransen	2217	Java	2017-09-15 16:43:47
3	Crystal Sharpe	2254	Java	2020-06-20 05:48:53
4	Doug Goodman	2365	Java	2020-04-22 15:07:10
5	Aldo Chow	2425	Java	2017-07-18 05:02:58
6	John Huddleston	2488	Java	2024-04-22 16:15:31
7	John Huddleston	2494	Java	2024-04-23 16:58:23
8	Tyler VanHaren	2596	Java	2018-03-08 22:01:36
9	Noah Goldsmid	2651	Java	2018-09-22 15:47:28
10	Hidden user	2838	Java	2022-03-26 20:57:55

#	User	Length	Language	Date
1	Christian Cederquist	2257	JavaScript (SpiderMonkey)	2023-05-09 23:51:59

#	User	Length	Language	Date
1	Phường Lên	2522	Kotlin	2020-04-28 04:35:02
2	Hidden user	2892	Kotlin	2020-04-12 04:52:50

#	User	Length	Language	Date
1	Andreas Björklund	848	Python 2	2020-08-24 18:29:47
2	Måns Magnusson	1238	Python 2	2019-04-26 12:19:42
3	Lars Åström	1246	Python 2	2019-04-25 21:15:40
4	Haochen Chen	1341	Python 2	2016-11-05 19:35:19
5	Adriaan de Vries	1366	Python 2	2016-12-18 01:06:35
6	Olav Røthe Bakken	1847	Python 2	2020-03-03 13:08:57

#	User	Length	Language	Date
1	Kelly Dance	738	Python 3	2022-10-27 04:59:11
2	Oskar Haarklou Veileborg	927	Python 3	2022-02-10 19:25:44
3	Bryan Wong Wei Heng	1564	Python 3	2019-12-09 09:06:57
4	Sven Holtrop	1572	Python 3	2019-09-14 18:03:35
5	Jing Huang	1580	Python 3	2017-05-15 01:15:56
6	Leon Tham	1602	Python 3	2019-12-07 08:23:03
7	Martin Aumüller	1809	Python 3	2025-03-21 19:26:06
8	Christofer Ohlsson	1818	Python 3	2021-10-02 09:57:48
9	Hidden user	1819	Python 3	2020-03-04 21:13:58
10	Alexandre	1827	Python 3	2020-03-04 20:56:55

#	User	Length	Language	Date
1	Hidden user	3983	Rust	2024-06-21 17:43:30
2	Daniel Anker Hermansen	28091	Rust	2023-08-23 16:05:27
3	Vincent Lagerros	71783	Rust	2025-08-09 23:38:58

Solution running time distribution