Problem A
Path Tracing — Problem Statistics

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Submissions	5399
Accepted submissions	1582
Submission ratio	29.30%
Authors	1499
Accepted authors	1291
Author ratio	86.12%

#	User	Runtime	Language	Date
1	Lukasz	0.02 s	C#	2017-02-05 18:30:54
2	Donald Heppner	0.02 s	C#	2017-02-10 00:33:55
3	Mark Wardell	0.02 s	C#	2017-02-14 03:36:37
4	Moo	0.02 s	C#	2017-07-09 12:19:11
5	Jayant Notani	0.02 s	C#	2020-01-26 05:18:01
6	johannesth	0.02 s	C#	2022-04-18 19:54:46
7	Paweł Borkowski	0.03 s	C#	2020-03-04 18:58:24
8	Eralp Karakullukcu	0.03 s	C#	2023-03-09 09:53:08
9	Seth Kitchen	0.07 s	C#	2018-02-24 06:34:50
10	Apurv Parekh	0.08 s	C#	2019-02-22 21:32:09

#	User	Runtime	Language	Date
1	Norbert Voelker	0.07 s	Go	2021-11-05 22:33:38

#	User	Runtime	Language	Date
1	Morgan Hopkins	0.00 s	Haskell	2015-12-23 01:19:58
2	Max Jackson	0.01 s	Haskell	2016-05-01 04:30:36
3	Brent Yorgey	0.01 s	Haskell	2017-10-03 05:11:14
4	Alberto Cerezo Cid	0.01 s	Haskell	2018-10-18 20:19:57
5	Ryan Yates	0.01 s	Haskell	2019-04-27 04:47:27
6	Steinar Simonnes	0.01 s	Haskell	2025-02-04 14:47:08
7	Shinji Koshida	0.01 s	Haskell	2025-02-28 21:27:19
8	Yamato Matsuoka	0.05 s	Haskell	2016-06-04 04:29:18
9	Vasiliy Kevroletin	0.06 s	Haskell	2018-05-15 10:01:37
10	Brian Hwang	0.38 s	Haskell	2021-09-16 22:11:53

#	User	Runtime	Language	Date
1	Michael Sullivan	0.06 s	Java	2016-01-16 03:28:25
2	Terrence Park	0.06 s	Java	2016-02-10 22:38:53
3	Hidden user	0.06 s	Java	2016-09-11 13:59:24
4	Josenildo Silva	0.06 s	Java	2017-05-17 04:32:34
5	Isaac Lee	0.06 s	Java	2018-01-26 02:09:54
6	Liam Keliher	0.06 s	Java	2018-02-02 08:09:08
7	Pontus Eriksson	0.06 s	Java	2018-04-28 13:54:40
8	Micah Stairs	0.07 s	Java	2016-09-04 01:01:14
9	Paul Boddington	0.07 s	Java	2017-01-18 00:07:56
10	Thanh Quach	0.07 s	Java	2017-03-12 14:25:44

#	User	Runtime	Language	Date
1	Sahil Serrka	0.07 s	JavaScript (Node.js)	2024-07-03 10:39:06
2	JS together	0.07 s	JavaScript (Node.js)	2024-07-03 11:21:25
3	Stephanie Keck	0.43 s	JavaScript (Node.js)	2020-01-20 09:20:46
4	Ni Mz	0.44 s	JavaScript (Node.js)	2020-10-30 06:39:50

#	User	Runtime	Language	Date
1	Michael Laszlo	0.01 s	JavaScript (SpiderMonkey)	2016-10-08 04:26:53
2	Piotr Karpała	0.01 s	JavaScript (SpiderMonkey)	2017-02-12 04:52:13
3	Piotr Karpala	0.01 s	JavaScript (SpiderMonkey)	2017-02-12 04:54:06
4	Peter Kedemo	0.02 s	JavaScript (SpiderMonkey)	2016-01-04 12:16:21
5	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2016-03-13 09:35:45
6	Johannes Strelen	0.03 s	JavaScript (SpiderMonkey)	2018-12-06 19:08:21
7	Christian Cederquist	0.03 s	JavaScript (SpiderMonkey)	2023-06-30 17:21:02
8	Zachary DeStefano	0.04 s	JavaScript (SpiderMonkey)	2019-09-28 22:44:31

#	User	Runtime	Language	Date
1	Timothy Gaede	0.73 s	Julia	2024-04-30 04:46:16

#	User	Runtime	Language	Date
1	Hidden user	0.18 s	Kotlin	2017-12-11 19:41:28
2	Mark Mathis	0.20 s	Kotlin	2018-10-17 01:58:38
3	Adam Rankin	0.20 s	Kotlin	2023-09-13 01:08:37
4	Kiel Dowdle	0.30 s	Kotlin	2020-04-02 06:50:46
5	Phường Lên	0.39 s	Kotlin	2020-03-11 04:36:06
6	Chris Johnson	0.61 s	Kotlin	2025-03-12 22:05:54

#	User	Runtime	Language	Date
1	rexifer	0.02 s	Lua	2025-03-16 18:49:01
2	Caleb Austin	0.20 s	Lua	2024-09-01 00:55:23

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-07-10 23:31:42
2	Nguyen Hoang Trung	0.01 s	Pascal	2017-06-17 05:27:36

#	User	Runtime	Language	Date
1	Anthony Galea	0.02 s	PHP	2021-01-16 23:52:03
2	Saginaw George	0.02 s	PHP	2021-01-17 13:39:02

#	User	Runtime	Language	Date
1	Jonas Kylling	0.03 s	Python 2	2015-09-19 12:35:48
2	Lars Tveito	0.03 s	Python 2	2015-10-20 03:00:38
3	Kai Alexander Wig	0.03 s	Python 2	2016-03-16 13:43:14
4	Neal Zane	0.03 s	Python 2	2016-08-03 21:30:11
5	Yan Kalchevsky	0.03 s	Python 2	2017-01-16 21:14:28
6	Nathan Villanueva	0.03 s	Python 2	2017-01-27 07:49:24
7	Jessica Fang	0.03 s	Python 2	2017-01-27 17:46:49
8	Przemysław Curzytek	0.03 s	Python 2	2017-02-06 06:28:17
9	Sigurður Jens Albertsson	0.03 s	Python 2	2017-11-18 02:00:00
10	Juliang Li	0.03 s	Python 2	2018-01-20 19:36:15

#	User	Runtime	Language	Date
1	Max Li	0.02 s	Python 3	2016-04-22 00:17:48
2	Daria Lidina	0.02 s	Python 3	2016-09-20 00:35:05
3	Jason Yuen	0.02 s	Python 3	2016-09-20 00:49:09
4	Juan Manuel Castro	0.02 s	Python 3	2017-05-05 19:37:46
5	Ciara Godwin	0.02 s	Python 3	2017-06-29 22:53:45
6	Manuel Kohnen	0.02 s	Python 3	2017-07-17 20:36:22
7	Jwad Aziz	0.02 s	Python 3	2017-08-05 05:32:58
8	David C.	0.02 s	Python 3	2017-10-25 02:33:02
9	Andre Pratama	0.02 s	Python 3	2018-03-28 06:55:58
10	Vincent Tandya	0.02 s	Python 3	2019-01-15 16:11:35

#	User	Runtime	Language	Date
1	Frederik Petersen	0.11 s	Ruby	2025-01-31 12:32:37

#	User	Runtime	Language	Date
1	Chaoyi Yin	0.00 s	Rust	2019-01-06 06:16:08
2	Bas Dirks	0.00 s	Rust	2022-01-27 20:55:06
3	Erik Magnusson	0.00 s	Rust	2024-12-10 20:14:05
4	C3Speedrun2024	0.00 s	Rust	2024-12-10 20:14:34
5	Hidden user	0.00 s	Rust	2024-12-24 04:15:12
6	Vincent Lagerros	0.00 s	Rust	2025-03-13 21:30:08
7	Alexander Nortung	0.01 s	Rust	2020-03-05 09:40:23
8	David Rasch	0.01 s	Rust	2020-07-24 14:40:58
9	Lucas Heede Vulpius	0.01 s	Rust	2021-02-03 03:50:02
10	Malte Kildelund Rosenkilde	0.01 s	Rust	2025-02-05 23:10:52

#	User	Length	Language	Date
1	Hidden user	893	C	2017-07-13 15:46:29
2	Þórður Agust	1062	C	2019-01-18 18:24:08
3	Hidden user	1399	C	2017-05-16 13:01:17
4	Sorakris Chaladlamsakul	1653	C	2017-05-20 14:25:48
5	Hidden user	1716	C	2025-02-17 11:05:08
6	Syed Abdullah	2119	C	2017-01-16 15:58:35
7	Andrew Roberts	2193	C	2018-05-07 09:33:09
8	Dexter Kwan	2220	C	2023-04-28 17:01:49
9	Wilson Ler	2221	C	2018-02-17 03:51:33
10	Ng Wei Jie	2221	C	2020-02-18 15:52:37

#	User	Length	Language	Date
1	Apurv Parekh	1862	C#	2019-02-22 21:32:09
2	Paweł Borkowski	2171	C#	2020-03-04 18:58:24
3	Jayant Notani	2243	C#	2020-01-26 05:18:01
4	Tomasz Masternak	2537	C#	2018-09-21 14:58:44
5	Andriy Zyevakov	2748	C#	2019-06-20 08:55:00
6	johannesth	3096	C#	2022-04-18 19:54:46
7	Mazen Mohamad	3311	C#	2018-08-31 16:08:56
8	Moo	5434	C#	2017-07-09 12:19:11
9	Eralp Karakullukcu	5535	C#	2023-03-09 09:53:08
10	Mark Wardell	5751	C#	2017-02-14 03:36:37

#	User	Length	Language	Date
1	Hidden user	701	C++	2020-03-25 00:12:52
2	Kieran Horgan	732	C++	2017-08-27 19:34:28
3	Vifill Sverrisson	761	C++	2018-12-31 04:35:14
4	Emmanuel Anaya	774	C++	2020-11-02 03:08:38
5	Hidden user	787	C++	2017-02-24 23:29:29
6	Jason Liu	808	C++	2024-08-27 03:18:45
7	Minh Tam Nguyen	811	C++	2017-12-17 15:44:27
8	Foozhan Ataiefard	815	C++	2017-05-10 18:36:14
9	Herman Karlsson	824	C++	2015-10-30 15:05:33
10	Lim Hong Hui Eugene	831	C++	2017-01-13 16:02:46

#	User	Length	Language	Date
1	Norbert Voelker	1488	Go	2021-11-05 22:43:08

#	User	Length	Language	Date
1	Brent Yorgey	1102	Haskell	2017-10-03 05:11:14
2	Alberto Cerezo Cid	1189	Haskell	2018-10-18 20:19:57
3	Shinji Koshida	1244	Haskell	2025-02-28 21:27:19
4	Ryan Yates	1330	Haskell	2019-04-27 04:47:27
5	Steinar Simonnes	1621	Haskell	2025-02-04 14:48:05
6	Max Jackson	1788	Haskell	2016-05-01 04:30:36
7	Vasiliy Kevroletin	2089	Haskell	2018-05-15 10:01:37
8	Yamato Matsuoka	2196	Haskell	2016-06-04 04:29:18
9	Morgan Hopkins	2416	Haskell	2015-12-23 01:19:58
10	Brian Hwang	2503	Haskell	2021-09-16 22:11:53

#	User	Length	Language	Date
1	Jason Leatherman	1108	Java	2018-02-25 05:32:39
2	Abdelrahman Mokbel	1193	Java	2021-10-29 03:54:25
3	Frank Ruskey	1315	Java	2016-11-17 00:07:39
4	Suhail Khan	1358	Java	2022-08-10 12:16:57
5	Jordan Lamkin	1392	Java	2017-01-27 01:13:53
6	Doug Goodman	1395	Java	2017-03-17 17:58:33
7	Josenildo Silva	1413	Java	2017-05-17 04:32:34
8	Kyar Nyo Aye	1446	Java	2018-03-16 09:21:23
9	James Black	1464	Java	2018-01-26 02:38:25
10	Majeed Thaika	1495	Java	2017-05-20 07:38:40

#	User	Length	Language	Date
1	JS together	1186	JavaScript (Node.js)	2024-07-03 11:21:25
2	Sahil Serrka	1188	JavaScript (Node.js)	2024-07-03 10:39:06
3	Ni Mz	1658	JavaScript (Node.js)	2020-10-30 06:39:50
4	Stephanie Keck	3676	JavaScript (Node.js)	2020-01-20 09:20:46

#	User	Length	Language	Date
1	Johannes Strelen	961	JavaScript (SpiderMonkey)	2018-12-06 19:08:21
2	Bjørn Chr. Soltvedt	1011	JavaScript (SpiderMonkey)	2016-03-13 09:35:45
3	Peter Kedemo	1103	JavaScript (SpiderMonkey)	2016-01-04 12:16:21
4	Zachary DeStefano	1150	JavaScript (SpiderMonkey)	2019-09-28 22:44:31
5	Christian Cederquist	1184	JavaScript (SpiderMonkey)	2023-06-30 17:21:02
6	Michael Laszlo	1780	JavaScript (SpiderMonkey)	2016-10-08 04:26:53
7	Piotr Karpała	4883	JavaScript (SpiderMonkey)	2017-02-12 04:52:13
8	Piotr Karpala	4883	JavaScript (SpiderMonkey)	2017-02-12 04:54:06

#	User	Length	Language	Date
1	Timothy Gaede	2526	Julia	2024-04-30 04:46:16

#	User	Length	Language	Date
1	Hidden user	1141	Kotlin	2017-12-11 19:41:28
2	Kiel Dowdle	1428	Kotlin	2020-04-02 06:45:47
3	Mark Mathis	1435	Kotlin	2018-10-17 01:58:38
4	Chris Johnson	1655	Kotlin	2025-03-12 22:05:54
5	Phường Lên	1995	Kotlin	2020-03-11 04:36:06
6	Adam Rankin	2272	Kotlin	2023-09-13 01:08:37

#	User	Length	Language	Date
1	rexifer	1132	Lua	2025-03-16 18:49:01
2	Caleb Austin	2072	Lua	2024-09-01 00:55:23

#	User	Length	Language	Date
1	Nguyen Hoang Trung	1213	Pascal	2017-06-17 05:27:36
2	Ingemar Ragnemalm	1678	Pascal	2018-07-10 23:31:42

#	User	Length	Language	Date
1	Anthony Galea	5404	PHP	2021-01-16 23:52:03
2	Saginaw George	5404	PHP	2021-01-17 13:39:02

#	User	Length	Language	Date
1	Thomas Feld	476	Python 2	2020-07-22 11:05:58
2	Andreas Björklund	650	Python 2	2020-10-25 09:25:27
3	Yanmarshus Bachtiar	711	Python 2	2020-09-17 12:19:49
4	Sigurður Jens Albertsson	726	Python 2	2017-11-18 02:00:00
5	John Paul Hanson	730	Python 2	2018-10-24 01:08:16
6	Neal Zane	736	Python 2	2016-08-03 21:30:11
7	Asger Hautop Drewsen	739	Python 2	2015-11-22 01:54:23
8	Sindri Magnusson	740	Python 2	2019-01-15 05:07:17
9	Nathan Villanueva	747	Python 2	2017-01-27 07:49:24
10	Tore Norderud	773	Python 2	2015-11-08 02:07:48

#	User	Length	Language	Date
1	Peter Stauder	374	Python 3	2023-01-29 16:40:15
2	Ahmed Chamseddine	407	Python 3	2025-05-15 00:28:19
3	Thøger Bro	568	Python 3	2024-02-06 20:06:01
4	Nicholas Russell Saerang	593	Python 3	2023-08-13 11:18:51
5	Raymond Yang	594	Python 3	2019-12-31 04:47:22
6	Natalie Axelsson	595	Python 3	2017-11-20 22:41:26
7	Kelly Dance	629	Python 3	2023-07-29 18:50:44
8	Jonas Ulsnes Jørgensen	634	Python 3	2025-01-31 14:31:54
9	Eyad Nazir	643	Python 3	2024-01-26 04:38:27
10	Oskar Haarklou Veileborg	649	Python 3	2020-02-03 11:21:22

#	User	Length	Language	Date
1	Frederik Petersen	757	Ruby	2025-01-31 12:32:37

#	User	Length	Language	Date
1	David Rasch	1097	Rust	2020-07-24 14:40:58
2	Vincent Lagerros	1147	Rust	2025-03-13 21:30:08
3	Malte Kildelund Rosenkilde	1336	Rust	2025-02-05 23:10:52
4	Chaoyi Yin	1395	Rust	2019-01-06 06:16:08
5	Bas Dirks	1807	Rust	2022-01-27 20:55:06
6	Alexander Nortung	2462	Rust	2020-03-05 09:40:23
7	Lucas Heede Vulpius	2740	Rust	2021-02-03 04:06:53
8	Hidden user	3373	Rust	2024-12-24 04:15:12
9	Erik Magnusson	5444	Rust	2024-12-10 20:14:05
10	C3Speedrun2024	5444	Rust	2024-12-10 20:14:34

Solution running time distribution