Problem A
Vaccine Efficacy — Problem Statistics

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Submissions	3437
Accepted submissions	1322
Submission ratio	38.46%
Authors	1233
Full solves [?]	1077
Full solve Ratio	87.35%

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.00 s	C	2021-03-28 15:35:01
2	Max Nilsson	0.00 s	C	2021-07-05 21:46:08
3	April Clark	0.00 s	C	2021-09-28 14:17:26
4	Gergő Kádas	0.00 s	C	2022-10-22 16:21:19
5	Thatsit	0.00 s	C	2022-11-15 21:58:17
6	Shaan Edoardo Vashisht	0.00 s	C	2022-11-16 00:58:50
7	Hidden user	0.00 s	C	2022-11-25 22:22:20
8	Eyleifur Bjarkason	0.00 s	C	2022-12-07 00:21:28
9	Mirel Cosulschi	0.00 s	C	2022-12-23 21:49:02

#	User	Runtime	Language	Date
1	Fredrik Möller	0.03 s	C#	2021-04-08 16:22:55
2	Kalle Hansen	0.03 s	C#	2021-05-17 20:01:26
3	Mikael Fiala-Lundström	0.03 s	C#	2021-07-18 01:08:24
4	ThatMatrix	0.03 s	C#	2022-01-19 14:52:29
5	Michael Jonsson	0.04 s	C#	2023-09-29 16:53:05
6	Steve Williams	0.04 s	C#	2023-12-11 00:08:50
7	Benjamin Bilbeau	0.04 s	C#	2023-12-11 20:07:06

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.06 s	F#	2023-03-04 14:57:38

#	User	Runtime	Language	Date
1	Norbert Voelker	0.08 s	Go	2021-09-26 20:17:38
2	Sergey Jakobsen	0.16 s	Go	2022-01-04 01:35:10

#	User	Runtime	Language	Date
1	Brent Yorgey	0.01 s	Haskell	2021-03-28 19:44:56
2	Hidden user	0.01 s	Haskell	2023-01-12 08:06:20
3	Steinar Simonnes	0.01 s	Haskell	2025-06-13 09:46:46
4	Isaac Arvestad	0.02 s	Haskell	2021-09-15 06:57:12
5	Jan Hrček	0.03 s	Haskell	2021-03-29 06:02:15

#	User	Runtime	Language	Date
1	Crystal Sharpe	0.07 s	Java	2021-04-08 00:09:37
2	Emil Bak-Møller	0.07 s	Java	2021-08-02 21:07:08
3	Ranjith M	0.07 s	Java	2025-09-07 01:00:09
4	Ho Lyun Jeong	0.08 s	Java	2021-04-16 01:30:06
5	Kevin Lim Yong Shen	0.08 s	Java	2021-06-01 09:51:28
6	Ethan Fan	0.08 s	Java	2021-08-10 18:26:27
7	Josh Henderson	0.08 s	Java	2021-11-20 21:16:34
8	Ray Bai	0.08 s	Java	2021-12-08 18:58:57
9	Hidden user	0.08 s	Java	2022-10-23 21:06:04
10	Issa Issack	0.08 s	Java	2023-10-21 21:01:36

#	User	Runtime	Language	Date
1	Gábor Harangozó	0.10 s	JavaScript (Node.js)	2023-07-24 13:42:47

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2021-03-28 08:05:06
2	Andrew Stoute	0.03 s	JavaScript (SpiderMonkey)	2023-12-14 14:02:58
3	Christian Pilegaard Cederquist	0.04 s	JavaScript (SpiderMonkey)	2023-03-19 17:39:45

#	User	Runtime	Language	Date
1	Timothy Gaede	0.57 s	Julia	2024-06-25 11:25:44
2	Hidden user	0.68 s	Julia	2025-04-08 19:26:48

#	User	Runtime	Language	Date
1	Jacob Huebner	0.13 s	Kotlin	2021-08-13 21:18:02
2	Kiel Dowdle	0.14 s	Kotlin	2021-08-13 21:11:26
3	Nicholas Johnson	0.16 s	Kotlin	2021-10-07 03:20:23
4	Chelsea Hoernemann	0.18 s	Kotlin	2022-11-09 02:16:00
5	Adam Rankin	0.21 s	Kotlin	2023-05-08 19:09:25
6	Sondre Nilsen	0.22 s	Kotlin	2021-04-08 13:54:46
7	Kelly Dance	0.23 s	Kotlin	2022-09-24 22:36:19
8	Danzel Artamadja	0.26 s	Kotlin	2021-07-14 13:44:44

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2021-06-06 20:07:13

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.03 s	Prolog	2022-08-22 18:54:21

#	User	Runtime	Language	Date
1	Yanmarshus Bachtiar	0.05 s	Python 2	2021-05-30 10:01:32
2	Johan Lyts	0.07 s	Python 2	2021-04-06 12:24:30

#	User	Runtime	Language	Date
1	Yousef Hassan	0.05 s	Python 3	2025-09-07 20:30:47
2	Zuhier	0.05 s	Python 3	2025-09-08 19:01:09
3	Russell	0.05 s	Python 3	2025-09-21 05:59:47
4	Noah Hessen Bjerke	0.05 s	Python 3	2025-11-28 02:21:14
5	Łukasz Łukaszew	0.06 s	Python 3	2021-03-29 07:20:02
6	Hidden user	0.06 s	Python 3	2022-03-12 13:59:08
7	Mikael Kiste	0.06 s	Python 3	2022-05-27 19:09:33
8	Lucas Anderson	0.06 s	Python 3	2022-09-14 01:59:51
9	Jacob Albers	0.06 s	Python 3	2022-09-17 00:20:03
10	Kiu Yan Yu	0.06 s	Python 3	2022-10-08 07:18:19

#	User	Runtime	Language	Date
1	Miorel Palii	0.07 s	Ruby	2022-03-26 07:02:03
2	Thomas Feld	0.07 s	Ruby	2023-03-02 15:03:09

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

#	User	Length	Language	Date
1	Mirel Cosulschi	922	C	2022-12-23 21:49:02
2	April Clark	1014	C	2021-09-28 14:17:26
3	Shaan Edoardo Vashisht	1575	C	2022-11-16 00:58:50
4	Max Nilsson	1591	C	2021-07-05 21:46:08
5	Bergur Snorrason	1902	C	2021-03-28 15:35:01
6	Thatsit	2925	C	2022-11-15 21:58:17
7	Hidden user	3091	C	2022-11-25 22:22:20
8	Gergő Kádas	4321	C	2022-10-22 16:21:19
9	Eyleifur Bjarkason	8060	C	2022-12-07 00:21:28

#	User	Length	Language	Date
1	Benjamin Bilbeau	2047	C#	2023-12-11 20:07:06
2	Michael Jonsson	2056	C#	2023-09-29 16:53:05
3	Steve Williams	2641	C#	2023-12-11 00:08:50
4	Mikael Fiala-Lundström	2810	C#	2021-07-18 01:08:24
5	ThatMatrix	3423	C#	2022-01-19 14:52:29
6	Fredrik Möller	3473	C#	2021-04-08 16:22:55
7	Kalle Hansen	3473	C#	2021-05-17 20:01:26

#	User	Length	Language	Date
1	Zac Friggstad	503	C++	2021-04-12 15:18:58
2	Dmitry Lyubshin	543	C++	2023-03-25 05:14:07
3	Chris Trevisan	556	C++	2021-04-10 23:47:06
4	Frederick Pek	606	C++	2021-12-10 05:29:39
5	Grae Yeandle	607	C++	2021-03-27 19:28:56
6	David Trettin	619	C++	2022-08-28 15:28:58
7	人外沙耶	653	C++	2021-03-31 17:53:43
8	Mulyani	666	C++	2021-03-29 10:09:08
9	Hyunjun Lee	668	C++	2022-10-12 10:35:06
10	Reiya Downs	695	C++	2021-04-22 19:24:03

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1554	F#	2023-03-04 14:57:38

#	User	Length	Language	Date
1	Sergey Jakobsen	612	Go	2022-01-04 01:35:10
2	Norbert Voelker	1201	Go	2021-09-26 20:17:38

#	User	Length	Language	Date
1	Isaac Arvestad	941	Haskell	2021-09-15 06:57:12
2	Steinar Simonnes	1178	Haskell	2025-06-13 09:51:43
3	Jan Hrček	1592	Haskell	2021-03-29 06:02:15
4	Brent Yorgey	2305	Haskell	2021-03-28 19:44:56
5	Hidden user	2748	Haskell	2023-01-12 08:06:20

#	User	Length	Language	Date
1	Doug Goodman	821	Java	2021-11-20 18:01:39
2	Markus Bao	947	Java	2024-01-06 13:52:49
3	Eric Leow Yu Quan	983	Java	2021-04-27 14:03:16
4	Ethan Fan	1094	Java	2021-08-10 18:26:27
5	Arup Ratan Guha	1099	Java	2024-12-15 22:48:17
6	Satya Sai Rama Reddy Chinnam	1100	Java	2024-11-08 16:57:39
7	Cody Korman	1140	Java	2022-09-17 21:38:34
8	Brandon Ou	1214	Java	2021-12-08 17:59:14
9	John Vincent Chua	1252	Java	2023-06-11 14:14:18
10	Gabriel Porch	1256	Java	2024-06-21 02:13:47

#	User	Length	Language	Date
1	Gábor Harangozó	2505	JavaScript (Node.js)	2023-07-24 13:42:47

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	415	JavaScript (SpiderMonkey)	2021-03-28 08:05:06
2	Christian Pilegaard Cederquist	636	JavaScript (SpiderMonkey)	2023-03-19 17:39:45
3	Andrew Stoute	1998	JavaScript (SpiderMonkey)	2023-12-14 14:02:58

#	User	Length	Language	Date
1	Hidden user	216	Julia	2025-04-08 19:45:41
2	Timothy Gaede	662	Julia	2024-06-25 11:25:44

#	User	Length	Language	Date
1	Adam Rankin	708	Kotlin	2023-05-08 19:09:25
2	Kelly Dance	883	Kotlin	2022-09-24 22:36:19
3	Jacob Huebner	943	Kotlin	2021-08-13 21:18:02
4	Danzel Artamadja	952	Kotlin	2021-07-14 13:44:44
5	Sondre Nilsen	1133	Kotlin	2021-04-08 13:54:46
6	Chelsea Hoernemann	2534	Kotlin	2022-11-09 02:16:00
7	Nicholas Johnson	2788	Kotlin	2021-10-07 03:20:23
8	Kiel Dowdle	3943	Kotlin	2021-08-13 21:11:26

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1682	Pascal	2021-06-06 20:07:13

#	User	Length	Language	Date
1	Andriy Zyevakov	2625	Prolog	2022-08-22 18:54:21

#	User	Length	Language	Date
1	Yanmarshus Bachtiar	981	Python 2	2021-05-30 10:01:32
2	Johan Lyts	1153	Python 2	2021-04-06 12:28:02

#	User	Length	Language	Date
1	Benjamin Z White	179	Python 3	2023-05-11 13:48:05
2	Nino Bašić	220	Python 3	2023-01-09 19:03:32
3	Eduardo Vicente Petry	241	Python 3	2023-01-26 23:53:13
4	Noah Hessen Bjerke	284	Python 3	2025-11-28 02:21:14
5	Ahmed Chamseddine	303	Python 3	2024-06-17 10:15:32
6	Tianyi Cheng	316	Python 3	2023-10-09 07:26:13
7	Brandon Chua Chi Yan	316	Python 3	2023-10-09 15:13:48
8	K Lin	317	Python 3	2023-03-09 04:50:17
9	Wu Mingkun	322	Python 3	2022-10-08 04:05:19
10	Nicholas Russell Saerang	324	Python 3	2023-06-23 19:04:59

#	User	Length	Language	Date
1	Thomas Feld	150	Ruby	2023-05-24 08:21:04
2	Miorel Palii	556	Ruby	2022-03-26 07:02:03

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

Solution running time distribution