Problem A
Train Passengers — Problem Statistics

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Submissions	13892
Accepted submissions	4188
Submission ratio	30.15%
Authors	3781
Full solves [?]	3351
Full solve Ratio	88.63%

#	User	Runtime	Language	Date
1	Charlie Forsberg Hedberg	0.01 s	C#	2015-07-07 09:30:59
2	Martin Nyström	0.01 s	C#	2016-12-20 17:00:40
3	Mousami Chand	0.01 s	C#	2018-05-30 09:40:31
4	Hidden user	0.01 s	C#	2018-05-30 10:14:18
5	Adam Bergholtz	0.01 s	C#	2018-05-31 11:52:32
6	Jonas Stensiö	0.01 s	C#	2018-05-31 13:34:22
7	Αναστάσιος Θωμαΐδης	0.01 s	C#	2018-06-01 14:27:24
8	Bas te Kolste	0.02 s	C#	2014-10-04 14:14:03
9	Ayk Stepanyan	0.02 s	C#	2014-10-05 19:46:38
10	masosz	0.02 s	C#	2015-01-20 22:54:43

#	User	Runtime	Language	Date
1	David Cawthon	0.02 s	Common Lisp	2019-05-28 02:42:08
2	Hidden user	0.02 s	Common Lisp	2019-06-11 06:59:22

#	User	Runtime	Language	Date
1	Mads Jespersen	0.04 s	F#	2020-03-08 23:03:58
2	Jacob Harris Cryer Kragh	0.04 s	F#	2023-03-27 17:38:14

#	User	Runtime	Language	Date
1	Chris Vilches	0.00 s	Go	2024-08-16 19:59:45
2	Jinwoo Lee	0.07 s	Go	2018-12-23 19:51:06
3	Norbert Voelker	0.07 s	Go	2021-04-07 16:17:01
4	Nicolai Skogheim	0.08 s	Go	2016-09-29 18:29:04
5	Miguel Martinez	0.08 s	Go	2019-07-22 12:44:19
6	Olof Gren	0.08 s	Go	2019-11-19 19:05:54
7	Ainun Nazieb	0.08 s	Go	2020-08-28 02:45:58
8	Magix	0.08 s	Go	2020-09-16 11:51:43
9	Krzysztof Gibuła	0.08 s	Go	2021-02-23 16:45:19
10	Fei Dong	0.08 s	Go	2022-03-25 15:55:46

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.04 s	Java	2024-08-31 13:20:15
2	Hidden user	0.04 s	Java	2024-09-28 05:10:48
3	Antipov Andrew	0.05 s	Java	2014-10-04 11:35:00
4	Mattis Kancans Envall	0.05 s	Java	2014-10-04 16:03:50
5	Axel Lewenhaupt	0.05 s	Java	2014-10-04 16:05:28
6	Filip Buszko	0.05 s	Java	2014-10-04 16:51:19
7	Jimmy Mårdell	0.05 s	Java	2014-12-23 10:04:37
8	Henrik Sandström	0.05 s	Java	2015-02-08 21:22:40
9	Edward Kim	0.05 s	Java	2015-03-14 18:44:05
10	Yixin Tao	0.05 s	Java	2015-03-14 19:51:27

#	User	Runtime	Language	Date
1	Hidden user	0.05 s	JavaScript (Node.js)	2019-03-01 17:54:00
2	Sander Hellesø	0.05 s	JavaScript (Node.js)	2019-04-20 23:39:37
3	Bálint Tasnádi	0.09 s	JavaScript (Node.js)	2023-03-08 17:22:04
4	Natna Mebrahtu	0.09 s	JavaScript (Node.js)	2023-04-07 21:35:38
5	Hidden user	0.09 s	JavaScript (Node.js)	2023-04-21 23:31:26
6	Jose Cervantes	0.41 s	JavaScript (Node.js)	2020-03-12 06:11:49
7	Swetabh Subham	0.41 s	JavaScript (Node.js)	2021-01-09 23:55:15
8	Kristin Dahlén	0.42 s	JavaScript (Node.js)	2020-02-17 11:24:20
9	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-14 08:47:11
10	William Jessop	0.42 s	JavaScript (Node.js)	2021-03-02 01:25:25

#	User	Runtime	Language	Date
1	Hinse ter Schuur	0.01 s	JavaScript (SpiderMonkey)	2015-11-26 21:52:02
2	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-21 01:08:34
3	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-04-03 15:34:25
4	Hà Minh Ngọc	0.01 s	JavaScript (SpiderMonkey)	2016-07-26 13:26:26
5	Krishna Vishal D	0.01 s	JavaScript (SpiderMonkey)	2017-08-15 23:16:10
6	Peter Menyes	0.02 s	JavaScript (SpiderMonkey)	2021-09-24 22:32:05
7	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-06-05 08:53:25

#	User	Runtime	Language	Date
1	Timothy Gaede	0.50 s	Julia	2024-04-30 13:11:25

#	User	Runtime	Language	Date
1	Huiren Woo	0.11 s	Kotlin	2020-07-11 09:01:53
2	Johnny Baloney	0.13 s	Kotlin	2021-12-02 12:04:50
3	James WIlliams	0.15 s	Kotlin	2020-09-07 20:50:24
4	Dayan Ruben Gonzalez	0.15 s	Kotlin	2020-09-30 02:56:53
5	Benjamin Laurence Erickson	0.16 s	Kotlin	2019-01-11 15:57:56
6	Aksel Holbek Sørbye	0.17 s	Kotlin	2022-09-29 16:18:57
7	Neil Harmon	0.18 s	Kotlin	2019-10-18 12:40:57
8	Dmitry Shostak	0.18 s	Kotlin	2020-07-15 10:44:04
9	Sergey Jakobsen	0.19 s	Kotlin	2021-03-13 15:06:05
10	Ahmed Waseem Saeed	0.19 s	Kotlin	2021-12-22 17:31:09

#	User	Runtime	Language	Date
1	Peter Hairatidis	0.00 s	Lua	2025-10-07 23:12:01

#	User	Runtime	Language	Date
1	Nguyen Hoang Trung	0.00 s	Pascal	2017-06-18 05:15:59
2	Ingemar Ragnemalm	0.00 s	Pascal	2017-09-14 08:27:22

#	User	Runtime	Language	Date
1	Silvena Lam	0.01 s	PHP	2016-06-06 11:26:35
2	Susanne Ragnemalm	0.01 s	PHP	2018-05-22 19:16:23
3	Daniel Savov	0.01 s	PHP	2020-09-17 16:38:29

#	User	Runtime	Language	Date
1	Aleksander Burkow	0.02 s	Python 2	2014-10-04 11:36:36
2	Hidden user	0.02 s	Python 2	2014-10-04 11:38:16
3	When the NULL Breaks	0.02 s	Python 2	2014-10-04 12:32:31
4	Magnus Hagmar	0.02 s	Python 2	2014-10-04 13:42:18
5	Hidden user	0.02 s	Python 2	2014-10-04 23:01:52
6	Hidden user	0.02 s	Python 2	2014-10-06 12:15:37
7	Jacob Wejendorp	0.02 s	Python 2	2014-10-26 18:31:23
8	Erik Fredriksen	0.02 s	Python 2	2014-11-28 18:32:23
9	Erik Jansson	0.02 s	Python 2	2014-12-09 18:12:10
10	Jonas Kylling	0.02 s	Python 2	2014-12-13 18:50:12

#	User	Runtime	Language	Date
1	Hidden user	0.02 s	Python 3	2014-10-08 09:19:30
2	Patrick Johannessen	0.02 s	Python 3	2014-10-29 12:12:44
3	Brian Harrington	0.02 s	Python 3	2015-02-24 00:43:34
4	Martin Stensgård	0.02 s	Python 3	2015-03-16 00:05:16
5	Nils Gustafsson	0.02 s	Python 3	2015-03-25 21:09:26
6	Fredrik Carlsen	0.02 s	Python 3	2015-06-08 01:21:32
7	James Elías Sigurðarson	0.02 s	Python 3	2015-06-11 15:08:40
8	Johannes Agestam	0.02 s	Python 3	2015-06-15 00:30:56
9	John Harrison	0.02 s	Python 3	2015-09-18 17:32:12
10	Victor Zheng	0.02 s	Python 3	2015-10-04 05:07:48

#	User	Runtime	Language	Date
1	Lasse Berglund	0.03 s	Ruby	2016-04-22 11:58:37
2	Sebastian Craig	0.03 s	Ruby	2016-10-20 01:42:11
3	Mridula Prabhu	0.03 s	Ruby	2017-06-04 11:56:26
4	Hidden user	0.05 s	Ruby	2021-07-04 13:05:38
5	Kok Dith	0.05 s	Ruby	2021-08-23 14:42:08
6	Marie Cornellier	0.05 s	Ruby	2021-09-03 03:48:50
7	Thomas Feld	0.06 s	Ruby	2023-03-29 13:55:59
8	Russell Ng	0.07 s	Ruby	2025-06-05 06:05:06

#	User	Length	Language	Date
1	Jeroen Bransen	469	C	2014-10-06 11:25:17
2	Lawrence Li	496	C	2016-01-10 16:32:56
3	Michal Kouril	523	C	2014-10-11 21:36:51
4	Sambit Palit	528	C	2020-10-19 02:20:39
5	Simon M. Binyamin	534	C	2018-01-04 14:10:20
6	PhilCampbell	538	C	2021-01-23 17:45:24
7	Bryan Heryanto	541	C	2019-10-02 11:08:25
8	Ivan Petrov	550	C	2019-05-31 13:23:59
9	Andrew Roberts	582	C	2017-09-13 01:31:25
10	Seth Carter	614	C	2020-09-03 23:24:24

#	User	Length	Language	Date
1	Johan Ahlrik	704	C#	2023-07-05 22:59:48
2	Jonas Stensiö	763	C#	2018-05-31 13:34:22
3	Hidden user	765	C#	2018-05-31 15:05:01
4	Liam Percy	808	C#	2018-09-28 00:21:13
5	ANTON ERIKSSON	908	C#	2023-04-12 14:52:09
6	Marek Bina	927	C#	2019-02-18 17:25:13
7	Doug Goodman	932	C#	2018-07-06 23:30:24
8	Bahareh C Takaldani	979	C#	2023-02-06 06:56:21
9	Göran Andersson	1015	C#	2022-05-21 00:07:20
10	Hidden user	1051	C#	2021-07-07 14:44:53

#	User	Length	Language	Date
1	Mugeon Kim	272	C++	2024-01-27 10:55:38
2	Antonio Molina Lovett	313	C++	2016-08-07 11:02:59
3	Hidden user	315	C++	2023-08-26 19:43:44
4	Herman Karlsson	326	C++	2015-02-08 12:22:22
5	David Wärn	331	C++	2015-04-21 16:54:32
6	Zane Yu	346	C++	2018-12-03 15:36:16
7	Johan Wind	362	C++	2015-05-15 17:07:08
8	Joshua Chan	376	C++	2016-07-30 08:27:42
9	Hidden user	377	C++	2023-04-28 03:38:34
10	Đoàn Công Chính	381	C++	2018-01-18 00:57:22

#	User	Length	Language	Date
1	Hidden user	570	Common Lisp	2019-06-11 06:59:22
2	David Cawthon	1358	Common Lisp	2019-05-28 02:42:08

#	User	Length	Language	Date
1	Mads Jespersen	1036	F#	2020-03-08 23:03:58
2	Jacob Harris Cryer Kragh	1769	F#	2023-03-27 17:38:14

#	User	Length	Language	Date
1	Chris Vilches	483	Go	2024-08-16 19:59:45
2	Fei Dong	531	Go	2022-03-25 15:55:46
3	Olof Gren	678	Go	2019-11-19 19:05:54
4	Ainun Nazieb	785	Go	2020-08-28 02:45:58
5	Krzysztof Gibuła	814	Go	2021-02-23 16:45:19
6	Miguel Martinez	815	Go	2019-07-22 12:44:19
7	Nicolai Skogheim	845	Go	2016-09-29 18:29:04
8	Norbert Voelker	1050	Go	2021-04-07 16:17:01
9	Jinwoo Lee	1153	Go	2018-12-23 19:51:06
10	Magix	1546	Go	2020-09-16 11:51:43

#	User	Length	Language	Date
1	Li Jun	437	Haskell	2023-06-27 18:30:42
2	Lukas Polacek	501	Haskell	2015-07-09 21:02:29
3	Shinji Koshida	530	Haskell	2025-01-21 21:33:51
4	Matthew Johnson	531	Haskell	2017-05-02 21:07:01
5	Caleb Surovik	575	Haskell	2021-07-18 05:11:30
6	David Wärn	578	Haskell	2015-10-09 14:30:10
7	Qi Ji	693	Haskell	2018-12-27 20:06:57
8	Lars Tveito	728	Haskell	2015-08-28 22:54:59
9	Mason Barnhill	795	Haskell	2023-04-22 18:36:26
10	David Zacek	799	Haskell	2021-07-09 21:19:14

#	User	Length	Language	Date
1	Sven Bergius	533	Java	2017-11-23 19:45:33
2	Doug Goodman	546	Java	2018-06-04 16:14:12
3	Natalie Longtin	566	Java	2017-10-30 20:10:25
4	Brennan Cleland	578	Java	2023-06-28 01:34:35
5	Kiên Nguyễn Tiến Trung	581	Java	2017-01-15 12:08:40
6	Likhitha Sadavala	596	Java	2022-07-25 19:07:12
7	Liu Boyu	606	Java	2019-09-08 15:06:01
8	Hidden user	607	Java	2017-11-25 00:20:40
9	Linghao Dai	610	Java	2019-09-03 16:32:42
10	Dai Linghao	610	Java	2019-09-03 16:33:39

#	User	Length	Language	Date
1	Natna Mebrahtu	840	JavaScript (Node.js)	2023-04-07 21:35:38
2	Chris Wong	878	JavaScript (Node.js)	2021-03-13 18:08:54
3	Sander Hellesø	1176	JavaScript (Node.js)	2019-04-20 23:39:37
4	Jose Cervantes	1176	JavaScript (Node.js)	2020-03-12 06:11:49
5	William Jessop	1415	JavaScript (Node.js)	2021-03-02 01:25:25
6	Swetabh Subham	1449	JavaScript (Node.js)	2021-01-09 23:55:15
7	Andoko Chandra	1488	JavaScript (Node.js)	2020-10-14 08:47:11
8	Kristin Dahlén	1535	JavaScript (Node.js)	2020-02-17 11:24:20
9	Bálint Tasnádi	1606	JavaScript (Node.js)	2023-03-08 17:22:04
10	Niamh Limerick	1706	JavaScript (Node.js)	2022-03-25 15:57:02

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	312	JavaScript (SpiderMonkey)	2016-04-03 15:34:25
2	Peter Menyes	505	JavaScript (SpiderMonkey)	2021-09-24 22:32:05
3	Christian Pilegaard Cederquist	546	JavaScript (SpiderMonkey)	2023-06-05 08:53:25
4	Peter Kedemo	784	JavaScript (SpiderMonkey)	2015-12-21 01:08:34
5	Hà Minh Ngọc	897	JavaScript (SpiderMonkey)	2016-07-26 13:26:26
6	Hinse ter Schuur	924	JavaScript (SpiderMonkey)	2015-11-26 21:52:02
7	Krishna Vishal D	955	JavaScript (SpiderMonkey)	2017-08-15 23:16:10

#	User	Length	Language	Date
1	Timothy Gaede	747	Julia	2024-04-30 13:11:25

#	User	Length	Language	Date
1	Dmitry Shostak	515	Kotlin	2020-07-15 10:44:04
2	Dayan Ruben Gonzalez	583	Kotlin	2020-09-30 02:56:53
3	Aksel Holbek Sørbye	648	Kotlin	2022-09-29 16:18:57
4	Adam Rankin	690	Kotlin	2023-08-26 00:04:27
5	Sergey Jakobsen	711	Kotlin	2021-03-13 15:06:05
6	Benjamin Laurence Erickson	722	Kotlin	2019-01-11 15:57:56
7	Ahmed Waseem Saeed	1034	Kotlin	2021-12-22 17:31:09
8	Troy Warmboe	1077	Kotlin	2020-03-05 22:13:58
9	Johnny Baloney	1258	Kotlin	2021-12-02 12:04:50
10	Neil Harmon	1335	Kotlin	2019-10-18 12:40:57

#	User	Length	Language	Date
1	Peter Hairatidis	1425	Lua	2025-10-07 23:12:01

#	User	Length	Language	Date
1	Nguyen Hoang Trung	434	Pascal	2017-06-18 05:15:59
2	Ingemar Ragnemalm	870	Pascal	2017-09-14 08:27:22

#	User	Length	Language	Date
1	Susanne Ragnemalm	656	PHP	2018-05-22 19:16:23
2	Daniel Savov	1219	PHP	2020-09-17 16:38:29
3	Silvena Lam	1387	PHP	2016-06-06 11:52:44

#	User	Length	Language	Date
1	Thomas Feld	194	Python 2	2019-08-23 10:14:48
2	Erik Odenman	283	Python 2	2015-05-10 17:48:04
3	Andreas Björklund	288	Python 2	2019-05-08 21:09:24
4	Jesper Öqvist	293	Python 2	2018-11-02 17:51:24
5	Nicole Hedblom	315	Python 2	2015-07-15 10:00:01
6	Adam Stuart Richardson	343	Python 2	2015-03-14 18:21:05
7	Eoin Davey	366	Python 2	2017-10-18 00:36:30
8	Haggai Liu	367	Python 2	2017-10-26 05:30:58
9	Hidden user	370	Python 2	2014-10-04 23:01:52
10	Jeff Robertson	370	Python 2	2016-10-04 02:01:17

#	User	Length	Language	Date
1	Charles Ancheta	147	Python 3	2023-03-25 07:32:25
2	Sarek Høverstad Skotåm	151	Python 3	2022-10-01 03:19:58
3	Nino Bašić	172	Python 3	2023-01-08 20:42:14
4	Michael Goldwasser	177	Python 3	2025-08-28 06:24:07
5	Farzam Abrishami	217	Python 3	2024-01-28 19:56:33
6	Ahmed Chamseddine	226	Python 3	2025-01-02 21:43:21
7	Yong Mao	248	Python 3	2023-04-14 14:09:15
8	Thibault Raffaillac	268	Python 3	2020-01-29 08:33:33
9	Lim Dewen, Aloysius	269	Python 3	2021-05-03 17:33:33
10	Lee Isaac	284	Python 3	2021-12-04 00:59:31

#	User	Length	Language	Date
1	Thomas Feld	117	Ruby	2023-03-29 13:59:07
2	Russell Ng	126	Ruby	2025-06-05 06:05:06
3	Hidden user	245	Ruby	2021-07-04 13:05:38
4	Kok Dith	400	Ruby	2021-08-23 14:42:08
5	Lasse Berglund	617	Ruby	2016-04-22 11:58:37
6	Marie Cornellier	631	Ruby	2021-09-03 03:48:50
7	Sebastian Craig	1119	Ruby	2016-10-20 01:42:11
8	Mridula Prabhu	1257	Ruby	2017-06-04 11:56:26

#	User	Length	Language	Date
1	Bas Dirks	934	Rust	2022-01-07 09:30:06
2	Hidden user	934	Rust	2022-12-27 01:27:15
3	David Rasch	948	Rust	2021-05-03 12:42:16
4	Ishtiaq Hussain Naqi	1116	Rust	2023-10-22 20:02:54
5	Adam Gausmann	1422	Rust	2018-11-15 00:06:08
6	jaswanth	1654	Rust	2024-03-13 15:07:11
7	Maurice Makaay	1841	Rust	2022-11-29 10:58:14
8	Eskil Queseth	1864	Rust	2019-11-19 19:01:08
9	Hidden user	1945	Rust	2023-10-13 20:46:01
10	Joe Blower	2006	Rust	2025-08-02 19:13:07

Solution running time distribution