Problem A
Vaccine Efficacy — Problem Statistics

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Submissions	3423
Accepted submissions	1314
Submission ratio	38.39%
Authors	1224
Full solves [?]	1069
Full solve Ratio	87.34%

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.00 s	C	2021-03-28 17:35:01
2	Max Nilsson	0.00 s	C	2021-07-05 23:46:08
3	April Clark	0.00 s	C	2021-09-28 16:17:26
4	Gergő Kádas	0.00 s	C	2022-10-22 18:21:19
5	Thatsit	0.00 s	C	2022-11-15 22:58:17
6	Shaan Edoardo Vashisht	0.00 s	C	2022-11-16 01:58:50
7	Hidden user	0.00 s	C	2022-11-25 23:22:20
8	Eyleifur Bjarkason	0.00 s	C	2022-12-07 01:21:28
9	Hidden user	0.00 s	C	2022-12-23 22:49:02

#	User	Runtime	Language	Date
1	Fredrik Möller	0.03 s	C#	2021-04-08 18:22:55
2	Kalle Hansen	0.03 s	C#	2021-05-17 22:01:26
3	Mikael Fiala-Lundström	0.03 s	C#	2021-07-18 03:08:24
4	ThatMatrix	0.03 s	C#	2022-01-19 15:52:29
5	Michael Jonsson	0.04 s	C#	2023-09-29 18:53:05
6	Steve Williams	0.04 s	C#	2023-12-11 01:08:50
7	Benjamin Bilbeau	0.04 s	C#	2023-12-11 21:07:06

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.06 s	F#	2023-03-04 15:57:38

#	User	Runtime	Language	Date
1	Norbert Voelker	0.08 s	Go	2021-09-26 22:17:38
2	Sergey Jakobsen	0.16 s	Go	2022-01-04 02:35:10

#	User	Runtime	Language	Date
1	Brent Yorgey	0.01 s	Haskell	2021-03-28 21:44:56
2	Hidden user	0.01 s	Haskell	2023-01-12 09:06:20
3	Steinar Simonnes	0.01 s	Haskell	2025-06-13 11:46:46
4	Isaac Arvestad	0.02 s	Haskell	2021-09-15 08:57:12
5	Jan Hrček	0.03 s	Haskell	2021-03-29 08:02:15

#	User	Runtime	Language	Date
1	Crystal Sharpe	0.07 s	Java	2021-04-08 02:09:37
2	Emil Bak-Møller	0.07 s	Java	2021-08-02 23:07:08
3	Ranjith M	0.07 s	Java	2025-09-07 03:00:09
4	Ho Lyun Jeong	0.08 s	Java	2021-04-16 03:30:06
5	Kevin Lim Yong Shen	0.08 s	Java	2021-06-01 11:51:28
6	Ethan Fan	0.08 s	Java	2021-08-10 20:26:27
7	Josh Henderson	0.08 s	Java	2021-11-20 22:16:34
8	Ray Bai	0.08 s	Java	2021-12-08 19:58:57
9	Hidden user	0.08 s	Java	2022-10-23 23:06:04
10	Issa Issack	0.08 s	Java	2023-10-21 23:01:36

#	User	Runtime	Language	Date
1	Gábor Harangozó	0.10 s	JavaScript (Node.js)	2023-07-24 15:42:47

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2021-03-28 10:05:06
2	Andrew Stoute	0.03 s	JavaScript (SpiderMonkey)	2023-12-14 15:02:58
3	Christian Pilegaard Cederquist	0.04 s	JavaScript (SpiderMonkey)	2023-03-19 18:39:45

#	User	Runtime	Language	Date
1	Timothy Gaede	0.57 s	Julia	2024-06-25 13:25:44
2	Noszály Csaba	0.68 s	Julia	2025-04-08 21:26:48

#	User	Runtime	Language	Date
1	Jacob Huebner	0.13 s	Kotlin	2021-08-13 23:18:02
2	Kiel Dowdle	0.14 s	Kotlin	2021-08-13 23:11:26
3	Nicholas Johnson	0.16 s	Kotlin	2021-10-07 05:20:23
4	Chelsea Hoernemann	0.18 s	Kotlin	2022-11-09 03:16:00
5	Adam Rankin	0.21 s	Kotlin	2023-05-08 21:09:25
6	Sondre Nilsen	0.22 s	Kotlin	2021-04-08 15:54:46
7	Kelly Dance	0.23 s	Kotlin	2022-09-25 00:36:19
8	Danzel Artamadja	0.26 s	Kotlin	2021-07-14 15:44:44

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2021-06-06 22:07:13

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.03 s	Prolog	2022-08-22 20:54:21

#	User	Runtime	Language	Date
1	Yanmarshus Bachtiar	0.05 s	Python 2	2021-05-30 12:01:32
2	Johan Lyts	0.07 s	Python 2	2021-04-06 14:24:30

#	User	Runtime	Language	Date
1	Yousef Hassan	0.05 s	Python 3	2025-09-07 22:30:47
2	Zuhier	0.05 s	Python 3	2025-09-08 21:01:09
3	Russell	0.05 s	Python 3	2025-09-21 07:59:47
4	Łukasz Łukaszew	0.06 s	Python 3	2021-03-29 09:20:02
5	Hidden user	0.06 s	Python 3	2022-03-12 14:59:08
6	Mikael Kiste	0.06 s	Python 3	2022-05-27 21:09:33
7	Lucas Anderson	0.06 s	Python 3	2022-09-14 03:59:51
8	Jacob Albers	0.06 s	Python 3	2022-09-17 02:20:03
9	Kiu Yan Yu	0.06 s	Python 3	2022-10-08 09:18:19
10	Tan Yu Wei	0.06 s	Python 3	2022-10-09 02:29:14

#	User	Runtime	Language	Date
1	Miorel Palii	0.07 s	Ruby	2022-03-26 08:02:03
2	Thomas Feld	0.07 s	Ruby	2023-03-02 16:03:09

#	User	Runtime	Language	Date
1	Marc Fong	0.00 s	Rust	2021-06-02 04:14:14
2	Sherman Chann Zhi Shen	0.00 s	Rust	2021-09-22 09:53:02
3	Bas Dirks	0.00 s	Rust	2022-01-13 19:54:26
4	Artur Khuziakhmetov	0.00 s	Rust	2022-07-23 19:57:30
5	Niklas Sandén	0.00 s	Rust	2023-02-11 15:43:17
6	Vincent Lagerros	0.00 s	Rust	2025-03-03 18:39:35

#	User	Length	Language	Date
1	Hidden user	922	C	2022-12-23 22:49:02
2	April Clark	1014	C	2021-09-28 16:17:26
3	Shaan Edoardo Vashisht	1575	C	2022-11-16 01:58:50
4	Max Nilsson	1591	C	2021-07-05 23:46:08
5	Bergur Snorrason	1902	C	2021-03-28 17:35:01
6	Thatsit	2925	C	2022-11-15 22:58:17
7	Hidden user	3091	C	2022-11-25 23:22:20
8	Gergő Kádas	4321	C	2022-10-22 18:21:19
9	Eyleifur Bjarkason	8060	C	2022-12-07 01:21:28

#	User	Length	Language	Date
1	Benjamin Bilbeau	2047	C#	2023-12-11 21:07:06
2	Michael Jonsson	2056	C#	2023-09-29 18:53:05
3	Steve Williams	2641	C#	2023-12-11 01:08:50
4	Mikael Fiala-Lundström	2810	C#	2021-07-18 03:08:24
5	ThatMatrix	3423	C#	2022-01-19 15:52:29
6	Fredrik Möller	3473	C#	2021-04-08 18:22:55
7	Kalle Hansen	3473	C#	2021-05-17 22:01:26

#	User	Length	Language	Date
1	Zac Friggstad	503	C++	2021-04-12 17:18:58
2	Dmitry Lyubshin	543	C++	2023-03-25 06:14:07
3	Chris Trevisan	556	C++	2021-04-11 01:47:06
4	Frederick Pek	606	C++	2021-12-10 06:29:39
5	Grae Yeandle	607	C++	2021-03-27 20:28:56
6	David Trettin	619	C++	2022-08-28 17:28:58
7	人外沙耶	653	C++	2021-03-31 19:53:43
8	Mulyani	666	C++	2021-03-29 12:09:08
9	Hyunjun Lee	668	C++	2022-10-12 12:35:06
10	Reiya Downs	695	C++	2021-04-22 21:24:03

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1554	F#	2023-03-04 15:57:38

#	User	Length	Language	Date
1	Sergey Jakobsen	612	Go	2022-01-04 02:35:10
2	Norbert Voelker	1201	Go	2021-09-26 22:17:38

#	User	Length	Language	Date
1	Isaac Arvestad	941	Haskell	2021-09-15 08:57:12
2	Steinar Simonnes	1178	Haskell	2025-06-13 11:51:43
3	Jan Hrček	1592	Haskell	2021-03-29 08:02:15
4	Brent Yorgey	2305	Haskell	2021-03-28 21:44:56
5	Hidden user	2748	Haskell	2023-01-12 09:06:20

#	User	Length	Language	Date
1	Doug Goodman	821	Java	2021-11-20 19:01:39
2	Markus Bao	947	Java	2024-01-06 14:52:49
3	Eric Leow Yu Quan	983	Java	2021-04-27 16:03:16
4	Ethan Fan	1094	Java	2021-08-10 20:26:27
5	Arup Ratan Guha	1099	Java	2024-12-15 23:48:17
6	Satya Sai Rama Reddy Chinnam	1100	Java	2024-11-08 17:57:39
7	Cody Korman	1140	Java	2022-09-17 23:38:34
8	Brandon Ou	1214	Java	2021-12-08 18:59:14
9	John Vincent Chua	1252	Java	2023-06-11 16:14:18
10	Gabriel Porch	1256	Java	2024-06-21 04:13:47

#	User	Length	Language	Date
1	Gábor Harangozó	2505	JavaScript (Node.js)	2023-07-24 15:42:47

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	415	JavaScript (SpiderMonkey)	2021-03-28 10:05:06
2	Christian Pilegaard Cederquist	636	JavaScript (SpiderMonkey)	2023-03-19 18:39:45
3	Andrew Stoute	1998	JavaScript (SpiderMonkey)	2023-12-14 15:02:58

#	User	Length	Language	Date
1	Noszály Csaba	216	Julia	2025-04-08 21:45:41
2	Timothy Gaede	662	Julia	2024-06-25 13:25:44

#	User	Length	Language	Date
1	Adam Rankin	708	Kotlin	2023-05-08 21:09:25
2	Kelly Dance	883	Kotlin	2022-09-25 00:36:19
3	Jacob Huebner	943	Kotlin	2021-08-13 23:18:02
4	Danzel Artamadja	952	Kotlin	2021-07-14 15:44:44
5	Sondre Nilsen	1133	Kotlin	2021-04-08 15:54:46
6	Chelsea Hoernemann	2534	Kotlin	2022-11-09 03:16:00
7	Nicholas Johnson	2788	Kotlin	2021-10-07 05:20:23
8	Kiel Dowdle	3943	Kotlin	2021-08-13 23:11:26

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1682	Pascal	2021-06-06 22:07:13

#	User	Length	Language	Date
1	Andriy Zyevakov	2625	Prolog	2022-08-22 20:54:21

#	User	Length	Language	Date
1	Yanmarshus Bachtiar	981	Python 2	2021-05-30 12:01:32
2	Johan Lyts	1153	Python 2	2021-04-06 14:28:02

#	User	Length	Language	Date
1	Benjamin Z White	179	Python 3	2023-05-11 15:48:05
2	Nino Bašić	220	Python 3	2023-01-09 20:03:32
3	Eduardo Vicente Petry	241	Python 3	2023-01-27 00:53:13
4	Ahmed Chamseddine	303	Python 3	2024-06-17 12:15:32
5	Tianyi Cheng	316	Python 3	2023-10-09 09:26:13
6	Brandon Chua Chi Yan	316	Python 3	2023-10-09 17:13:48
7	K Lin	317	Python 3	2023-03-09 05:50:17
8	Wu Mingkun	322	Python 3	2022-10-08 06:05:19
9	Nicholas Russell Saerang	324	Python 3	2023-06-23 21:04:59
10	Xiong Qingwei	333	Python 3	2022-10-10 11:48:16

#	User	Length	Language	Date
1	Thomas Feld	150	Ruby	2023-05-24 10:21:04
2	Miorel Palii	556	Ruby	2022-03-26 08:02:03

#	User	Length	Language	Date
1	Artur Khuziakhmetov	891	Rust	2022-07-23 19:57:30
2	Vincent Lagerros	896	Rust	2025-03-03 18:39:35
3	Sherman Chann Zhi Shen	945	Rust	2021-09-22 09:53:02
4	Bas Dirks	1722	Rust	2022-01-13 19:54:26
5	Marc Fong	2260	Rust	2021-06-02 04:14:14
6	Niklas Sandén	26546	Rust	2023-02-11 15:43:17

Solution running time distribution