Problem D
Is-A? Has-A? Who Knowz-A? — Problem Statistics

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Submissions	2021
Accepted submissions	442
Submission ratio	21.87%
Authors	394
Full solves [?]	253
Full solve Ratio	64.21%

#	User	Runtime	Language	Date
1	Ivan Petrov	0.27 s	C	2017-11-30 15:26:21

#	User	Runtime	Language	Date
1	Landy Lu	0.01 s	C++	2024-03-27 05:54:54
2	Muhammad Irham Rasyidi	0.02 s	C++	2018-05-03 18:57:02
3	Lin Lee	0.02 s	C++	2018-11-18 11:40:30
4	Rahul Rajesh	0.02 s	C++	2019-04-04 11:55:18
5	Harrison Shen	0.02 s	C++	2020-07-14 23:43:52
6	dan cohen	0.03 s	C++	2025-05-07 15:08:15
7	Alex Dai	0.04 s	C++	2017-11-24 11:59:47
8	Serban Iorga	0.04 s	C++	2018-01-07 11:51:09
9	Vương Thiện Trung	0.04 s	C++	2019-08-20 00:52:14
10	Hidden user	0.04 s	C++	2019-10-27 01:57:14

#	User	Runtime	Language	Date
1	Roddy MacCrimmon	2.72 s	Go	2017-11-06 00:12:44

#	User	Runtime	Language	Date
1	Richard Peng	0.37 s	Java	2017-12-09 17:53:49
2	Nick Wu	0.38 s	Java	2017-10-28 19:21:29
3	Bjørn Dons	0.47 s	Java	2023-07-29 21:40:30
4	Hidden user	0.62 s	Java	2018-10-18 18:54:48
5	Brendan Jones	0.77 s	Java	2022-11-12 00:34:23
6	speedycatfish	0.79 s	Java	2024-02-11 22:23:24
7	Ariana Herbst	0.83 s	Java	2018-10-13 20:39:48
8	Aarav Singh	0.83 s	Java	2018-10-30 02:35:52
9	Yue (Rachel) Guo	1.02 s	Java	2018-10-21 01:27:55
10	Godmar Back	1.03 s	Java	2018-10-14 16:58:35

#	User	Runtime	Language	Date
1	Nicholas Johnson	0.88 s	Kotlin	2021-04-22 01:29:25
2	Kiel Dowdle	0.91 s	Kotlin	2021-04-19 01:03:55
3	Jacob Huebner	1.17 s	Kotlin	2021-04-15 11:53:56
4	Ronald Cruz	1.23 s	Kotlin	2017-12-13 05:41:01

#	User	Runtime	Language	Date
1	Måns Magnusson	0.21 s	Python 2	2018-09-22 22:36:13
2	Björn Magnusson	0.21 s	Python 2	2021-09-23 18:21:41
3	Maj Stenmark	0.24 s	Python 2	2018-09-16 20:21:13
4	Robert Kramer	1.01 s	Python 2	2017-10-30 00:07:18
5	Hidden user	2.04 s	Python 2	2017-11-01 15:24:26
6	Can Liu	2.72 s	Python 2	2018-10-16 07:33:07

#	User	Runtime	Language	Date
1	Jeremy Lim	0.30 s	Python 3	2023-12-11 08:04:44
2	Måns Magnusson	0.55 s	Python 3	2021-09-23 17:48:47
3	Edward Gao	1.25 s	Python 3	2021-03-04 02:30:15
4	Justin Gou	1.67 s	Python 3	2020-12-12 22:39:04
5	Agis Daniels	2.24 s	Python 3	2024-02-03 21:08:35
6	Duoduo Zhao	2.57 s	Python 3	2025-08-10 05:19:30
7	Hidden user	2.77 s	Python 3	2023-08-06 21:21:56
8	João Augusto Pimentel Barbosa	2.85 s	Python 3	2024-06-26 04:17:27
9	Idan Albo	2.92 s	Python 3	2023-12-30 20:49:55
10	Baz Baz	2.93 s	Python 3	2018-10-11 04:03:06

#	User	Length	Language	Date
1	Ivan Petrov	3412	C	2017-11-30 15:26:21

#	User	Length	Language	Date
1	Hao Du	1053	C++	2020-02-28 02:50:47
2	מגיב גן	1077	C++	2025-06-03 23:04:44
3	Jeffrey Lee	1091	C++	2018-05-08 03:41:55
4	Leo Lee	1111	C++	2025-06-20 01:41:28
5	Ernest Ng Zi Xuan	1112	C++	2024-11-12 01:32:44
6	Hidden user	1134	C++	2025-07-15 22:58:14
7	Markus Mathiasen	1169	C++	2023-08-07 16:05:51
8	Pu Chen	1183	C++	2017-11-10 20:15:43
9	Samuel Ferreira	1201	C++	2017-11-01 17:20:11
10	Hidden user	1209	C++	2018-10-13 19:31:38

#	User	Length	Language	Date
1	Roddy MacCrimmon	1181	Go	2017-11-06 00:12:44

#	User	Length	Language	Date
1	Doug Goodman	1432	Java	2017-10-29 15:08:03
2	David Wang	1861	Java	2020-12-12 22:11:26
3	Eimhin McDonald	2023	Java	2017-10-31 04:43:20
4	Darko Aleksic	2063	Java	2019-10-26 05:18:58
5	Jiru Xu	2228	Java	2017-11-03 05:15:34
6	Godmar Back	2331	Java	2018-10-14 16:53:37
7	Nick Jarvis	2343	Java	2018-10-27 19:29:27
8	Nick Wu	2457	Java	2017-10-28 19:21:29
9	Richard Peng	2457	Java	2017-12-09 17:53:49
10	Alex Lind	2465	Java	2018-10-16 18:03:57

#	User	Length	Language	Date
1	Ronald Cruz	1311	Kotlin	2017-12-13 05:41:01
2	Jacob Huebner	1734	Kotlin	2021-04-15 11:53:56
3	Nicholas Johnson	2803	Kotlin	2021-04-22 01:29:25
4	Kiel Dowdle	3684	Kotlin	2021-04-19 01:03:55

#	User	Length	Language	Date
1	Måns Magnusson	1271	Python 2	2018-09-22 22:36:13
2	Robert Kramer	1287	Python 2	2017-10-30 00:07:18
3	Can Liu	1518	Python 2	2018-10-16 07:33:07
4	Maj Stenmark	1611	Python 2	2018-09-16 20:26:21
5	Björn Magnusson	1993	Python 2	2021-09-23 18:21:41
6	Hidden user	2017	Python 2	2017-11-01 15:24:26

#	User	Length	Language	Date
1	Hidden user	993	Python 3	2023-08-06 21:25:45
2	Idan Albo	993	Python 3	2023-12-30 20:49:55
3	Agis Daniels	1051	Python 3	2024-02-03 21:08:35
4	João Augusto Pimentel Barbosa	1207	Python 3	2024-06-26 04:17:27
5	Jeremy Lim	1381	Python 3	2023-12-11 08:17:24
6	Edward Gao	1407	Python 3	2021-03-04 02:30:15
7	Måns Magnusson	1850	Python 3	2021-09-23 17:48:47
8	Justin Gou	1983	Python 3	2020-12-12 22:39:04
9	Baz Baz	3118	Python 3	2018-10-11 04:03:06
10	Duoduo Zhao	3265	Python 3	2025-08-10 05:19:30

Solution running time distribution