Problem A
Planting Trees — Problem Statistics

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Submissions	18617
Accepted submissions	8337
Submission ratio	44.78%
Authors	7230
Accepted authors	6592
Author ratio	91.18%

#	User	Runtime	Language	Date
1	Max NC	0.05 s	APL	2023-09-12 22:07:44

#	User	Runtime	Language	Date
1	Danny Robinson	0.10 s	Bash	2025-01-28 01:40:16

#	User	Runtime	Language	Date
1	Oblok	0.00 s	C	2016-08-31 21:44:17
2	Luis Alves	0.01 s	C	2015-07-19 22:13:59
3	Anton Lyxell	0.01 s	C	2016-02-11 18:02:57
4	Hidden user	0.01 s	C	2017-05-21 09:00:23
5	Bergur Snorrason	0.01 s	C	2018-11-05 20:48:51
6	Yannik Mahlau	0.01 s	C	2019-10-01 05:39:48
7	Eyleifur Bjarkason	0.01 s	C	2020-01-21 15:28:02
8	Raphael Kwankam	0.01 s	C	2020-09-04 09:25:45
9	Matthew Hooper	0.01 s	C	2020-11-19 02:12:17
10	Anton Siderud	0.01 s	C	2022-09-09 19:25:18

#	User	Runtime	Language	Date
1	Matthew Hooper	0.03 s	C#	2020-08-28 20:01:09
2	Joe Amenta	0.04 s	C#	2016-04-09 20:46:57
3	Justin Tse	0.05 s	C#	2016-08-29 06:28:47
4	Владимир Хилько	0.05 s	C#	2022-10-10 07:34:50
5	Noah Santorello	0.06 s	C#	2013-10-08 01:29:48
6	Ilia Denotkine	0.06 s	C#	2014-04-22 23:11:39
7	Randy	0.06 s	C#	2014-09-18 04:59:57
8	Arnar Bjarni Arnarson	0.06 s	C#	2014-09-30 21:31:30
9	Mike Spendlove	0.06 s	C#	2014-10-01 08:42:50
10	Sampath Vuyyuru	0.06 s	C#	2014-10-02 05:45:32

#	User	Runtime	Language	Date
1	Evgeny Savinov	0.01 s	C++	2013-10-05 11:37:49
2	Julián Camargo	0.01 s	C++	2013-10-24 03:46:34
3	Niklas Baumstark	0.01 s	C++	2013-11-18 03:47:22
4	Paul Khadim	0.01 s	C++	2014-09-01 19:23:18
5	Luis Vasquez	0.01 s	C++	2014-09-19 01:38:48
6	Joe Bob	0.01 s	C++	2014-10-01 16:58:55
7	Magnus Olsson	0.01 s	C++	2014-10-03 18:00:39
8	Joe Amenta	0.01 s	C++	2014-11-09 19:52:05
9	Johan Sannemo	0.01 s	C++	2014-11-21 22:01:53
10	Björn Ingi Baldvinsson	0.01 s	C++	2014-12-05 13:33:41

#	User	Runtime	Language	Date
1	Ari Páll Agnarsson	0.09 s	Common Lisp	2021-01-28 03:56:21

#	User	Runtime	Language	Date
1	Matthew Hooper	0.05 s	F#	2020-11-27 09:32:10
2	Jacob Harris Cryer Kragh	0.10 s	F#	2022-07-18 07:50:39
3	Jakob Israelsen	0.14 s	F#	2020-03-06 15:20:40
4	Mads Jespersen	0.21 s	F#	2020-03-06 15:44:21

#	User	Runtime	Language	Date
1	Jonas Mittnacht	0.08 s	Go	2024-02-14 16:56:52
2	Krzysztof Gibuła	0.09 s	Go	2019-03-09 14:24:29
3	Kent Gustavsson	0.09 s	Go	2020-06-05 13:27:00
4	Péter Szakszon	0.09 s	Go	2021-12-20 08:05:37
5	Magix	0.10 s	Go	2020-09-17 13:14:51
6	Norbert Voelker	0.10 s	Go	2021-04-23 15:14:37
7	Tobias Pulls	0.11 s	Go	2014-09-29 23:19:21
8	dick move	0.11 s	Go	2021-05-10 01:20:57
9	Việt Hà Nguyễn	0.14 s	Go	2016-07-21 15:00:45
10	James Robb	0.17 s	Go	2020-05-05 23:17:17

#	User	Runtime	Language	Date
1	Øyvind Almli	0.15 s	Haskell	2021-09-22 18:37:09
2	David Spies	0.16 s	Haskell	2014-11-30 10:03:49
3	Isaac Arvestad	0.16 s	Haskell	2017-02-18 01:23:36
4	Morten Lohne	0.16 s	Haskell	2017-10-25 00:20:58
5	Agus Sentosa Hermawan	0.17 s	Haskell	2020-01-09 01:31:34
6	Blake Nedved	0.31 s	Haskell	2019-10-31 06:27:40
7	Eskil Andréen	0.32 s	Haskell	2015-02-22 18:35:21
8	Jacques Schutte	0.32 s	Haskell	2018-06-20 12:27:13
9	Leslie Yip	0.32 s	Haskell	2022-08-06 08:55:30
10	Bob Smith	0.33 s	Haskell	2016-07-24 07:52:32

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.10 s	Java	2021-12-25 12:58:10
2	Tuấn Nguyễn	0.11 s	Java	2016-09-13 05:15:37
3	Hanh Nguyen	0.12 s	Java	2015-09-11 08:59:45
4	Mehdi Ichou	0.12 s	Java	2017-04-12 02:21:12
5	Fedor Poshman	0.12 s	Java	2018-04-25 13:20:30
6	Dat Vo Nguyen Tien	0.12 s	Java	2021-07-11 11:26:01
7	Ahmad Barhamje	0.12 s	Java	2023-08-17 01:45:13
8	Lee Heng Sheng	0.12 s	Java	2024-05-05 06:00:45
9	Ashu Yadav	0.13 s	Java	2017-06-05 17:04:08
10	José Vander Meulen	0.14 s	Java	2018-12-10 15:59:24

#	User	Runtime	Language	Date
1	Yassin Swag	0.10 s	JavaScript (Node.js)	2023-12-01 12:02:45
2	Hidden user	0.11 s	JavaScript (Node.js)	2024-11-16 01:17:23
3	Jerry Hu	0.14 s	JavaScript (Node.js)	2019-01-25 05:00:14
4	Carl Sundvall	0.15 s	JavaScript (Node.js)	2018-11-16 14:34:13
5	Candace Graus	0.15 s	JavaScript (Node.js)	2019-02-05 05:36:39
6	Zacharias Enochsson	0.15 s	JavaScript (Node.js)	2023-02-04 10:42:26
7	John	0.16 s	JavaScript (Node.js)	2022-07-18 23:57:49
8	Darragh Burke	0.52 s	JavaScript (Node.js)	2020-01-22 23:53:54
9	Chris Wong	0.52 s	JavaScript (Node.js)	2021-02-20 00:01:15
10	Khin Nyunt	0.52 s	JavaScript (Node.js)	2021-11-28 05:36:46

#	User	Runtime	Language	Date
1	Peter Kedemo	0.03 s	JavaScript (SpiderMonkey)	2015-12-22 23:30:15
2	Ricardas Vaitkus	0.03 s	JavaScript (SpiderMonkey)	2016-04-11 08:00:14
3	Johannes Jensen	0.04 s	JavaScript (SpiderMonkey)	2016-03-17 14:20:11
4	Hà Minh Ngọc	0.04 s	JavaScript (SpiderMonkey)	2016-08-08 20:01:42
5	Spencer Smith	0.05 s	JavaScript (SpiderMonkey)	2019-01-16 00:11:15
6	Tor Skude	0.05 s	JavaScript (SpiderMonkey)	2019-05-14 14:33:59
7	Christopher Walther	0.05 s	JavaScript (SpiderMonkey)	2021-05-07 15:26:04
8	Zach Tschetter	0.05 s	JavaScript (SpiderMonkey)	2023-05-03 05:01:35
9	Davíð Helgason	0.06 s	JavaScript (SpiderMonkey)	2019-06-20 14:39:22
10	Ursula Hebert-Johnson	0.06 s	JavaScript (SpiderMonkey)	2020-01-23 19:39:20

#	User	Runtime	Language	Date
1	Timothy Gaede	0.60 s	Julia	2024-03-29 07:52:46
2	Danny Robinson	0.63 s	Julia	2025-01-28 01:27:58

#	User	Runtime	Language	Date
1	Nicholas Johnson	0.38 s	Kotlin	2022-05-27 15:06:27
2	Nico Metger	0.40 s	Kotlin	2021-11-22 19:53:29
3	Jahid Hasan Imon	0.44 s	Kotlin	2020-06-26 13:51:07
4	Dmitry Shostak	0.46 s	Kotlin	2018-06-16 17:33:51
5	Jacob Huebner	0.48 s	Kotlin	2020-03-17 00:25:49
6	Maryam Shafizadegan	0.50 s	Kotlin	2021-04-27 12:09:51
7	Masoud Soleimani	0.52 s	Kotlin	2021-05-02 20:42:39
8	Leonard Alexander Blechschmidt	0.52 s	Kotlin	2021-12-13 18:00:51
9	Yang Tang	0.52 s	Kotlin	2023-07-20 08:20:30
10	Banafshe Bamdad	0.53 s	Kotlin	2021-03-30 08:27:58

#	User	Runtime	Language	Date
1	Nick Porter	0.02 s	Objective-C	2016-08-29 07:56:48

#	User	Runtime	Language	Date
1	Joel Newman	0.06 s	OCaml	2023-09-29 22:13:59

#	User	Runtime	Language	Date
1	David Connolly	0.04 s	Pascal	2022-04-12 15:33:50
2	Ingemar Ragnemalm	0.85 s	Pascal	2017-09-03 10:00:04

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	PHP	2018-03-30 06:39:24
2	Ali Pandidan	0.08 s	PHP	2016-11-01 14:23:03
3	Susanne Ragnemalm	0.09 s	PHP	2018-04-11 15:43:13
4	cojonas1	0.10 s	PHP	2021-04-09 13:15:09
5	Renate	0.10 s	PHP	2021-11-17 01:34:49
6	Andre Wahyudi	0.11 s	PHP	2022-10-25 09:58:39

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.13 s	Prolog	2023-02-07 20:35:20
2	Danny Robinson	0.55 s	Prolog	2025-01-28 01:59:52

#	User	Runtime	Language	Date
1	Agnes Totschnig	0.06 s	Python 3	2019-08-16 09:10:34
2	Will Belote	0.06 s	Python 3	2019-08-21 22:51:18
3	Thomas McKanna	0.06 s	Python 3	2019-08-22 03:34:26
4	Muhammad Natsir	0.06 s	Python 3	2019-08-23 05:25:16
5	Hidden user	0.06 s	Python 3	2019-09-08 08:06:15
6	Thore Husfeldt	0.06 s	Python 3	2019-09-14 23:10:20
7	Tuan Le	0.06 s	Python 3	2019-09-22 23:39:12
8	Hyunwoo Kim	0.06 s	Python 3	2019-09-25 00:57:37
9	Sergio Sanz	0.06 s	Python 3	2019-09-28 04:00:47
10	Adam Hassan	0.06 s	Python 3	2019-10-03 21:36:47

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.42 s	Racket	2025-01-27 03:15:08

#	User	Runtime	Language	Date
1	Ryan	0.07 s	Ruby	2016-08-30 19:34:38
2	Kevin Suwala	0.07 s	Ruby	2017-01-07 03:20:56
3	Hidden user	0.07 s	Ruby	2018-03-27 21:18:12
4	Jason Zareski	0.07 s	Ruby	2018-03-27 21:31:53
5	Gerry Hall	0.08 s	Ruby	2016-03-18 05:40:59
6	John Bowers	0.08 s	Ruby	2018-03-27 22:41:28
7	Donald Dong	0.08 s	Ruby	2018-11-19 06:46:24
8	Mathias	0.08 s	Ruby	2019-09-12 12:13:53
9	Hidden user	0.09 s	Ruby	2019-11-17 20:52:31
10	Ella Moskun	0.10 s	Ruby	2020-09-05 05:39:11

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2024-08-25 17:37:20
2	Magnus Jacobsen	0.01 s	Rust	2019-08-28 17:43:57
3	Florian Nagel	0.01 s	Rust	2019-11-23 19:56:26
4	Conor McGovern	0.01 s	Rust	2019-12-11 22:57:56
5	Simon Green Kristensen	0.01 s	Rust	2020-03-06 16:39:14
6	Ryan Hawkins	0.01 s	Rust	2020-08-30 10:06:00
7	Joshua Ji	0.01 s	Rust	2020-10-21 06:36:56
8	Aidan Taylor	0.01 s	Rust	2021-02-06 05:09:25
9	David Rasch	0.01 s	Rust	2021-02-26 12:55:30
10	Eric Pinter	0.01 s	Rust	2021-07-26 16:34:37

#	User	Length	Language	Date
1	Max NC	63	APL	2023-09-12 22:07:44

#	User	Length	Language	Date
1	Danny Robinson	59	Bash	2025-01-28 01:40:16

#	User	Length	Language	Date
1	Martin Blom	193	C	2024-01-28 00:23:19
2	Mahdi Mouatta	368	C	2017-12-10 23:29:51
3	Abdellah Rami	370	C	2017-12-10 22:36:06
4	Widad Boujaafar	404	C	2017-12-10 23:28:11
5	Matthew Hartono	436	C	2022-09-18 11:52:19
6	Abdellah Naji	437	C	2017-12-10 22:38:09
7	Soumyadeep Roy	439	C	2015-08-26 21:12:54
8	Yassine Hammouch	461	C	2017-12-10 22:55:57
9	Magnus Wass	462	C	2020-03-24 15:06:05
10	Ivan Petrov	466	C	2019-07-09 09:38:54

#	User	Length	Language	Date
1	Gregory Sinclair	205	C#	2023-11-18 17:23:27
2	Sravani Dondapati	333	C#	2023-10-27 19:10:57
3	bhanu prakash konda	353	C#	2023-10-26 19:42:33
4	florist swe	359	C#	2024-12-04 22:22:54
5	Esty Crow	361	C#	2022-12-15 00:34:42
6	李陆屿	363	C#	2019-05-03 19:18:20
7	Klas af Geijerstam	376	C#	2018-04-03 07:19:23
8	Raja Sanjeev Kumar Nakka	395	C#	2016-06-18 04:03:45
9	Arun Kumar Pathipati	411	C#	2023-10-30 02:16:57
10	Hidden user	419	C#	2023-10-24 16:03:26

#	User	Length	Language	Date
1	Mikko Sysikaski	229	C++	2013-10-05 11:41:42
2	Thiên Tài Zero	242	C++	2016-11-23 13:44:01
3	William Gan	250	C++	2016-12-31 12:16:56
4	Tien Nguyen Van	250	C++	2019-08-13 15:31:32
5	Akash Kandpal	252	C++	2016-10-22 14:48:34
6	Elias Lolck	252	C++	2022-04-08 16:16:19
7	Way Tan	254	C++	2018-12-30 11:10:54
8	Herman Karlsson	255	C++	2015-02-11 21:51:31
9	Hidden user	256	C++	2023-07-01 13:53:33
10	Đoàn Công Chính	261	C++	2018-01-08 17:24:51

#	User	Length	Language	Date
1	Ari Páll Agnarsson	1959	Common Lisp	2021-01-28 03:56:21

#	User	Length	Language	Date
1	Matthew Hooper	263	F#	2020-11-27 06:30:09
2	Jacob Harris Cryer Kragh	269	F#	2022-07-18 07:50:39
3	Jakob Israelsen	332	F#	2020-03-06 15:20:40
4	Mads Jespersen	482	F#	2020-03-06 15:44:21

#	User	Length	Language	Date
1	Jonas Hedin	329	Go	2015-02-26 18:20:19
2	Theo Coyne Morgan	341	Go	2019-03-28 03:01:05
3	Tomas Forsman	403	Go	2014-10-02 21:41:40
4	Jonas Mittnacht	407	Go	2024-02-17 16:52:29
5	Ethan Ransom	486	Go	2016-08-31 22:50:02
6	Magnus C.F. Krøyer	490	Go	2019-08-27 18:58:20
7	Hidden user	523	Go	2016-09-15 18:14:48
8	Andriy Zyevakov	544	Go	2019-05-01 11:27:27
9	Tobias Pulls	568	Go	2014-09-29 23:19:21
10	James McDermott	571	Go	2018-05-03 14:09:45

#	User	Length	Language	Date
1	Birk Tjelmeland	115	Haskell	2017-01-12 17:47:54
2	Steinar Simonnes	151	Haskell	2024-01-30 16:55:34
3	Freek van Keulen	166	Haskell	2021-02-08 16:37:41
4	Bjarki Baldursson Harksen	179	Haskell	2021-01-27 12:33:20
5	Frederik Haagensen	182	Haskell	2019-08-28 15:21:53
6	Sebastian Banert	191	Haskell	2023-09-12 17:48:02
7	Jesper Amilon	198	Haskell	2020-08-07 12:29:16
8	Agus Sentosa Hermawan	201	Haskell	2020-01-09 01:30:07
9	Mario Calvarro	203	Haskell	2023-12-15 17:14:16
10	Blake Nedved	208	Haskell	2019-10-31 06:27:40

#	User	Length	Language	Date
1	Melanie Kirsche	380	Java	2014-09-30 22:41:12
2	Stephen Royal	387	Java	2015-08-21 18:53:34
3	Qritel Abdelilah	393	Java	2017-08-11 21:32:04
4	Anshu Kumar	396	Java	2024-12-17 10:22:10
5	Sophia Khalis	406	Java	2017-08-07 22:48:06
6	Sophia Khalis	406	Java	2017-08-07 22:48:43
7	Nikoline Olander Rasmussen	409	Java	2022-04-08 16:19:01
8	Andrew T Hatanpaa	412	Java	2017-06-13 17:17:43
9	Hidden user	412	Java	2015-02-22 17:59:01
10	Nanda Thant Sin	414	Java	2018-05-09 11:25:04

#	User	Length	Language	Date
1	Yassin Swag	366	JavaScript (Node.js)	2023-12-01 12:02:45
2	Chris Wong	494	JavaScript (Node.js)	2021-02-20 00:01:15
3	Ricardo	525	JavaScript (Node.js)	2020-10-22 03:06:49
4	Zacharias Enochsson	594	JavaScript (Node.js)	2023-02-04 10:42:26
5	Hovhannes Kantuni	636	JavaScript (Node.js)	2021-04-23 00:42:49
6	Hidden user	680	JavaScript (Node.js)	2024-11-16 01:17:23
7	Jerry Hu	698	JavaScript (Node.js)	2019-01-25 05:00:14
8	Khin Nyunt	709	JavaScript (Node.js)	2021-11-28 05:36:46
9	Andoko Chandra	723	JavaScript (Node.js)	2020-10-11 15:23:56
10	Ursula Hebert-Johnson	727	JavaScript (Node.js)	2020-01-30 20:46:35

#	User	Length	Language	Date
1	Christian Cederquist	82	JavaScript (SpiderMonkey)	2022-11-13 00:44:37
2	Jimmy Gustafsson	85	JavaScript (SpiderMonkey)	2024-06-18 07:54:43
3	Zach Tschetter	164	JavaScript (SpiderMonkey)	2023-05-03 05:01:35
4	Nguyễn Hùng Cường	171	JavaScript (SpiderMonkey)	2018-07-13 08:37:08
5	Davíð Helgason	182	JavaScript (SpiderMonkey)	2019-06-20 14:39:22
6	Peter Menyes	198	JavaScript (SpiderMonkey)	2021-09-13 21:55:06
7	Evan Magill	204	JavaScript (SpiderMonkey)	2024-10-28 18:12:11
8	Peter Kedemo	225	JavaScript (SpiderMonkey)	2015-12-22 23:30:15
9	Tor Nordqvist	239	JavaScript (SpiderMonkey)	2016-10-27 00:04:22
10	Bjørn Chr. Soltvedt	240	JavaScript (SpiderMonkey)	2016-01-20 09:49:00

#	User	Length	Language	Date
1	Danny Robinson	78	Julia	2025-01-28 01:27:58
2	Timothy Gaede	226	Julia	2024-03-29 07:52:46

#	User	Length	Language	Date
1	Yang Tang	144	Kotlin	2023-07-20 08:20:30
2	Mohamadhassan Ebrahimi	157	Kotlin	2019-11-06 14:54:22
3	Mohamma Ali Bashari movahhed	163	Kotlin	2019-11-08 15:09:50
4	Mohsen Dehbashi	164	Kotlin	2019-10-29 07:27:14
5	Thore Husfeldt	232	Kotlin	2020-11-03 19:24:05
6	Anders B. Clausen	233	Kotlin	2021-07-04 16:37:16
7	Troy Warmboe	235	Kotlin	2021-10-12 03:04:55
8	Dmitry Shostak	253	Kotlin	2018-06-16 17:33:51
9	Leonardo Henry Giorgiani Nogueira	282	Kotlin	2020-09-06 02:08:41
10	Nicholas Johnson	292	Kotlin	2022-05-27 15:06:27

#	User	Length	Language	Date
1	Nick Porter	842	Objective-C	2016-08-29 08:51:46

#	User	Length	Language	Date
1	Joel Newman	911	OCaml	2023-09-29 22:13:59

#	User	Length	Language	Date
1	David Connolly	915	Pascal	2022-04-12 15:33:50
2	Ingemar Ragnemalm	1534	Pascal	2017-09-03 10:00:04

#	User	Length	Language	Date
1	Renate	202	PHP	2021-11-17 01:34:49
2	Ali Pandidan	234	PHP	2016-11-01 14:23:03
3	Susanne Ragnemalm	259	PHP	2018-04-11 15:43:13
4	Hidden user	353	PHP	2018-03-30 06:39:24
5	cojonas1	416	PHP	2021-04-09 13:15:09
6	Andre Wahyudi	595	PHP	2022-10-25 09:58:39

#	User	Length	Language	Date
1	Danny Robinson	237	Prolog	2025-01-28 01:59:52
2	Hakan Kjellerstrand	307	Prolog	2023-02-07 20:35:20

#	User	Length	Language	Date
1	Hidden user	80	Python 3	2018-02-05 22:13:22
2	Danny Chen	81	Python 3	2023-02-19 06:03:20
3	Clement Oh	84	Python 3	2023-06-21 08:58:03
4	Lucian Freeze	85	Python 3	2024-01-13 08:42:30
5	Morten Clausen	86	Python 3	2022-10-23 23:43:42
6	Thomas Draper	86	Python 3	2022-12-14 20:05:30
7	Adil Rasiyani	86	Python 3	2023-02-17 22:35:44
8	Wernher To	86	Python 3	2023-02-18 07:05:38
9	Guillermo Hernández	89	Python 3	2022-08-25 00:26:54
10	I Coello	90	Python 3	2025-03-07 17:42:46

#	User	Length	Language	Date
1	Jinwoo Lee	351	Racket	2025-01-27 03:15:08

#	User	Length	Language	Date
1	Thomas Feld	61	Ruby	2022-11-07 08:54:28
2	Hidden user	79	Ruby	2019-11-17 20:52:31
3	Erik Rydbert	162	Ruby	2016-07-07 02:58:02
4	Donald Dong	174	Ruby	2018-11-19 06:46:24
5	Gerry Hall	203	Ruby	2016-03-18 05:40:59
6	Kevin Suwala	225	Ruby	2017-01-07 03:20:56
7	John Bowers	241	Ruby	2018-03-27 22:41:28
8	Mathias	241	Ruby	2019-09-12 12:13:53
9	Michael Go	245	Ruby	2024-05-25 04:31:25
10	Hidden user	269	Ruby	2018-03-27 21:18:12

#	User	Length	Language	Date
1	David Rasch	500	Rust	2021-02-26 12:55:30
2	Conor McGovern	505	Rust	2019-12-11 22:57:56
3	Dustin Ward	522	Rust	2024-05-01 18:20:04
4	Louis Bouchard	529	Rust	2024-10-04 20:27:27
5	Metin Gülseven	540	Rust	2022-09-25 20:42:21
6	Kok Dith	546	Rust	2021-08-11 10:33:44
7	Bas Dirks	569	Rust	2022-01-04 12:41:46
8	Simon Green Kristensen	575	Rust	2020-03-06 16:39:14
9	Aleksandr Kovalev	576	Rust	2024-06-07 17:01:03
10	Pankajkumar Patro	654	Rust	2024-07-21 00:20:01

Solution running time distribution