Problem A
Contact Tracing — Problem Statistics

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Submissions	575
Accepted submissions	191
Submission ratio	33.22%
Authors	199
Full solves [?]	169
Full solve Ratio	84.92%

#	User	Runtime	Language	Date
1	Bjørn Dons	0.08 s	Java	2023-08-12 21:30:39
2	Crystal Sharpe	0.11 s	Java	2022-06-16 04:51:12
3	Logan Pipes	0.12 s	Java	2022-06-01 03:25:59
4	Patrick Zhang	0.14 s	Java	2022-05-30 19:24:08
5	Doug Goodman	0.17 s	Java	2022-06-07 18:34:14
6	Peter Li	0.17 s	Java	2023-03-08 01:03:05
7	logan cheng	0.19 s	Java	2023-04-08 01:16:15
8	Arup Guha	0.61 s	Java	2022-12-05 22:08:24
9	Arup Ratan Guha	0.61 s	Java	2022-12-06 01:30:26

#	User	Runtime	Language	Date
1	Milwaukee School of Engineering	0.16 s	Kotlin	2022-05-30 19:06:03
2	Jacob Huebner	0.16 s	Kotlin	2022-05-30 23:11:33

#	User	Runtime	Language	Date
1	Isaac Lee	0.05 s	Python 3	2025-03-20 20:14:47
2	Kyle Layzer	0.05 s	Python 3	2025-05-17 20:37:26
3	Barry Tng	0.06 s	Python 3	2022-06-04 10:16:13
4	Kelly Dance	0.06 s	Python 3	2022-07-27 06:17:52
5	Hidden user	0.06 s	Python 3	2023-04-07 23:33:40
6	Vladyslav Myskiv	0.06 s	Python 3	2024-02-27 03:19:21
7	Jason Oliphant	0.06 s	Python 3	2025-04-19 22:04:52
8	Andy Liang	0.06 s	Python 3	2025-04-28 11:06:21
9	Luke Liu	0.07 s	Python 3	2023-04-06 23:44:44
10	Brigham Young University	0.08 s	Python 3	2022-05-30 19:11:06

#	User	Length	Language	Date
1	Evan Michael Bailey	780	C++	2023-05-28 22:47:44
2	Zhezheng Song	789	C++	2024-02-27 22:10:09
3	Hidden user	792	C++	2022-09-29 22:13:39
4	Daner Mendoza	812	C++	2023-07-16 03:13:59
5	Chenghao Wang	844	C++	2023-04-14 09:44:11
6	Javier Marinkovic	846	C++	2022-12-12 11:39:43
7	Gabriel de Albuquerque Souza Meireles	871	C++	2023-01-28 19:43:38
8	Alex Waese-Perlman	878	C++	2023-04-26 23:13:51
9	Davi Bonfim Moraes Morant de Holanda	887	C++	2023-01-28 19:44:23
10	Dmitry Lyubshin	913	C++	2023-04-28 16:27:31

#	User	Length	Language	Date
1	Doug Goodman	1375	Java	2022-06-07 18:34:14
2	Peter Li	1937	Java	2023-03-08 01:03:05
3	Arup Guha	2549	Java	2022-12-05 22:08:24
4	Patrick Zhang	2749	Java	2022-05-30 19:24:08
5	Crystal Sharpe	2910	Java	2022-06-16 04:51:12
6	Arup Ratan Guha	2973	Java	2022-12-06 01:30:26
7	Logan Pipes	2994	Java	2022-06-01 03:25:59
8	logan cheng	3124	Java	2023-04-08 01:16:15
9	Bjørn Dons	6976	Java	2023-08-12 21:30:39

#	User	Length	Language	Date
1	Milwaukee School of Engineering	1453	Kotlin	2022-05-30 19:06:03
2	Jacob Huebner	1504	Kotlin	2022-05-30 23:11:33

#	User	Length	Language	Date
1	Kelly Dance	469	Python 3	2022-07-27 06:13:18
2	Hidden user	562	Python 3	2022-06-06 02:21:00
3	Vladyslav Myskiv	697	Python 3	2024-02-27 03:19:21
4	Jason Oliphant	738	Python 3	2025-04-19 22:04:52
5	Dante Bencivenga	823	Python 3	2022-05-30 21:45:41
6	Isaac Lee	900	Python 3	2025-03-20 20:14:47
7	Brandon Young	917	Python 3	2023-11-19 20:21:49
8	Thomas Neill	939	Python 3	2022-05-31 23:18:34
9	Barry Tng	1051	Python 3	2022-06-04 10:16:13
10	Andy Liang	1116	Python 3	2025-04-28 11:06:21

Solution running time distribution