Problem A
Lifting Walls — Problem Statistics

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Submissions	6148
Accepted submissions	1502
Submission ratio	24.43%
Authors	1282
Full solves [?]	1065
Full solve Ratio	83.07%

#	User	Runtime	Language	Date
1	Stefano Cordio	0.00 s	C	2016-06-26 11:50:48
2	Tapani	0.00 s	C	2017-09-01 12:33:59
3	Bergur Snorrason	0.00 s	C	2021-05-31 09:26:39
4	Alexander Bilde Pedersen	0.00 s	C	2023-02-09 13:24:37
5	Mirel Cosulschi	0.00 s	C	2024-01-03 13:01:47
6	Phan Ngoc Lan	0.28 s	C	2016-07-02 10:12:28
7	Mikael K Eriksson	0.67 s	C	2021-02-17 10:00:37

#	User	Runtime	Language	Date
1	Bas te Kolste	0.02 s	C#	2015-09-09 21:25:59
2	Андрей Титов	0.02 s	C#	2016-01-21 13:13:27
3	Andrzej Krajniak	0.02 s	C#	2016-11-04 23:22:37
4	Khugan Shanmugeswaran	0.02 s	C#	2016-11-05 00:10:29
5	Gustav Kalander	0.03 s	C#	2018-05-15 12:09:33
6	Michael Damsgaard	0.05 s	C#	2024-12-07 23:31:28

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Common Lisp	2019-07-23 23:59:52

#	User	Runtime	Language	Date
1	Norbert Voelker	0.00 s	Go	2025-08-19 22:08:57
2	James Robb	0.03 s	Go	2020-05-04 17:26:58
3	James Robb	0.03 s	Go	2020-05-12 10:14:08
4	Việt Hà Nguyễn	0.08 s	Go	2016-06-30 16:57:28

#	User	Runtime	Language	Date
1	Brent Yorgey	0.00 s	Haskell	2017-12-21 22:30:11
2	Daniel Brännvall	0.00 s	Haskell	2023-08-10 16:37:55
3	Vasiliy Kevroletin	0.02 s	Haskell	2018-06-04 01:23:27

#	User	Runtime	Language	Date
1	Koji Lin	0.05 s	Java	2015-06-05 18:34:52
2	Terrence Park	0.05 s	Java	2016-03-15 05:09:21
3	Andreas Jansson	0.05 s	Java	2016-05-06 17:00:54
4	Stefano Cordio	0.05 s	Java	2016-06-12 08:34:06
5	Nick Wu	0.05 s	Java	2016-07-03 06:07:37
6	Erik Baalhuis	0.05 s	Java	2016-08-01 14:39:41
7	Josenildo Silva	0.05 s	Java	2017-05-08 20:56:49
8	Martijn Muijsers	0.05 s	Java	2017-05-10 14:45:43
9	Bjørn Dons	0.05 s	Java	2018-11-07 01:48:57
10	Fatima Mahmood	0.05 s	Java	2025-02-26 15:18:43

#	User	Runtime	Language	Date
1	Stephanie Keck	0.45 s	JavaScript (Node.js)	2020-02-19 07:51:28

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-05-01 19:46:20
2	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-07-05 15:33:53
3	Peter Kedemo	0.04 s	JavaScript (SpiderMonkey)	2017-06-25 14:33:26

#	User	Runtime	Language	Date
1	Hidden user	0.55 s	Julia	2025-04-06 17:59:20
2	Timothy Gaede	0.94 s	Julia	2025-09-11 06:05:23

#	User	Runtime	Language	Date
1	Johnny Baloney	0.15 s	Kotlin	2022-02-23 18:12:20
2	Love Brandefelt	0.24 s	Kotlin	2017-12-06 16:49:24
3	Adam Koprowski	0.29 s	Kotlin	2020-11-28 22:39:25
4	Isaac Owomugisha	0.33 s	Kotlin	2020-09-03 15:16:48
5	Adam Rankin	0.69 s	Kotlin	2023-09-13 23:11:06

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.04 s	Lua	2023-11-14 01:11:41

#	User	Runtime	Language	Date
1	Mohamed Badawy	0.03 s	Python 2	2015-06-28 14:22:02
2	Neal Zane	0.03 s	Python 2	2015-12-14 01:37:52
3	Caroline Heidenreich	0.03 s	Python 2	2016-10-18 21:08:00
4	Yan Kalchevsky	0.03 s	Python 2	2017-02-14 22:47:00
5	Jesper Öqvist	0.03 s	Python 2	2018-05-14 17:12:32
6	Maj Stenmark	0.03 s	Python 2	2018-05-14 18:52:06
7	Linus Karlsson	0.03 s	Python 2	2018-05-15 17:04:39
8	Lim Hong Hui Eugene	0.03 s	Python 2	2019-04-22 09:19:09
9	Ali Ibrahim	0.04 s	Python 2	2016-10-09 21:35:05
10	Juliang Li	0.04 s	Python 2	2018-02-16 22:12:47

#	User	Runtime	Language	Date
1	Nils Gustafsson	0.02 s	Python 3	2015-03-20 16:03:31
2	Björn Magnusson	0.02 s	Python 3	2016-05-06 15:55:28
3	Patrik Lilja	0.02 s	Python 3	2016-05-28 11:00:09
4	Brian Bauman	0.02 s	Python 3	2016-09-18 22:05:06
5	Ulrich Goertz	0.02 s	Python 3	2017-08-25 19:56:25
6	Henrik Adolfsson	0.02 s	Python 3	2017-12-06 20:57:11
7	Hien Le	0.02 s	Python 3	2018-04-26 18:00:36
8	Nathan Johnson	0.02 s	Python 3	2018-10-28 18:55:13
9	Bartek Gniewosz	0.02 s	Python 3	2018-11-07 12:44:40
10	Michael Goodale	0.02 s	Python 3	2019-02-03 22:39:05

#	User	Runtime	Language	Date
1	Thomas Feld	0.08 s	Ruby	2023-08-29 06:58:15

#	User	Runtime	Language	Date
1	Chaoyi Yin	0.00 s	Rust	2019-02-02 22:56:05
2	Chen Weikang	0.00 s	Rust	2019-02-02 22:59:22
3	Mario Rodriguez	0.00 s	Rust	2020-02-16 15:29:48
4	Jonathan Jiang	0.00 s	Rust	2021-04-11 20:02:56
5	Melker Forsberg	0.00 s	Rust	2023-08-10 12:38:25
6	Muhammad Sohail	0.00 s	Rust	2024-09-20 05:52:06
7	Artur Khuziakhmetov	0.00 s	Rust	2025-02-03 08:51:55
8	Hidden user	0.00 s	Rust	2025-03-01 10:37:58
9	Daniel Anker Hermansen	0.01 s	Rust	2022-12-30 10:01:17
10	Nicholas	0.06 s	Rust	2023-08-09 12:23:52

#	User	Length	Language	Date
1	Phan Ngoc Lan	1252	C	2016-07-02 10:12:28
2	Mirel Cosulschi	1779	C	2024-01-03 13:01:47
3	Tapani	1790	C	2017-09-01 12:33:59
4	Mikael K Eriksson	2059	C	2021-02-17 10:00:37
5	Bergur Snorrason	2369	C	2021-05-31 09:26:39
6	Alexander Bilde Pedersen	2415	C	2023-02-09 13:24:37
7	Stefano Cordio	3189	C	2016-06-26 11:50:48

#	User	Length	Language	Date
1	Michael Damsgaard	2554	C#	2024-12-07 23:36:32
2	Bas te Kolste	2815	C#	2015-09-09 21:25:59
3	Андрей Титов	3823	C#	2016-01-21 13:13:27
4	Gustav Kalander	4138	C#	2018-05-15 12:09:33
5	Khugan Shanmugeswaran	5478	C#	2016-11-05 00:10:29
6	Andrzej Krajniak	5549	C#	2016-11-04 23:22:37

#	User	Length	Language	Date
1	Johan Wind	698	C++	2018-05-15 13:34:47
2	Nazir Nayal	708	C++	2018-08-06 15:00:59
3	吳柏橙	711	C++	2021-02-10 09:10:03
4	Mathias Gernez	712	C++	2025-07-25 21:32:04
5	Diāna Stecka	739	C++	2025-09-03 18:22:05
6	William Gan	826	C++	2017-12-18 04:37:30
7	Jiang Yue	846	C++	2018-02-02 05:48:45
8	Nathaniel Ang	860	C++	2020-03-25 08:23:59
9	Chen Cui	892	C++	2017-11-02 05:53:00
10	Presley Graham	910	C++	2021-03-08 00:36:43

#	User	Length	Language	Date
1	Hidden user	1494	Common Lisp	2019-07-24 00:49:16

#	User	Length	Language	Date
1	Việt Hà Nguyễn	1757	Go	2016-07-01 09:06:30
2	Norbert Voelker	2503	Go	2025-08-19 22:08:57
3	James Robb	2900	Go	2020-05-04 17:29:22
4	James Robb	2900	Go	2020-05-12 10:14:08

#	User	Length	Language	Date
1	Brent Yorgey	1374	Haskell	2017-12-21 22:30:11
2	Daniel Brännvall	1701	Haskell	2023-08-10 16:37:55
3	Vasiliy Kevroletin	5630	Haskell	2018-06-04 01:23:27

#	User	Length	Language	Date
1	Jordan Lamkin	1090	Java	2017-02-17 21:24:53
2	Andres Felipe Borrero	1093	Java	2017-09-16 04:59:42
3	José Vander Meulen	1222	Java	2018-01-23 08:40:06
4	Aaron Hosler	1245	Java	2016-10-11 22:31:11
5	Dhairya Patel	1279	Java	2020-07-19 08:50:48
6	Ingrid Feng	1290	Java	2019-02-11 00:14:27
7	Hidden user	1309	Java	2017-02-16 04:38:30
8	Kurtis Van Gent	1324	Java	2016-10-06 21:00:14
9	Doug Goodman	1338	Java	2016-10-10 17:52:51
10	Tuan Truong	1375	Java	2019-10-14 22:36:14

#	User	Length	Language	Date
1	Stephanie Keck	9485	JavaScript (Node.js)	2020-02-19 07:51:28

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	1078	JavaScript (SpiderMonkey)	2016-05-01 19:46:20
2	Christian Pilegaard Cederquist	1443	JavaScript (SpiderMonkey)	2023-07-05 15:33:53
3	Peter Kedemo	1766	JavaScript (SpiderMonkey)	2017-06-25 14:33:26

#	User	Length	Language	Date
1	Hidden user	320	Julia	2025-04-06 18:08:06
2	Timothy Gaede	2061	Julia	2025-09-11 06:05:23

#	User	Length	Language	Date
1	Adam Koprowski	1212	Kotlin	2020-11-28 22:39:25
2	Love Brandefelt	1474	Kotlin	2017-12-06 16:49:24
3	Johnny Baloney	1965	Kotlin	2022-02-23 18:12:20
4	Adam Rankin	2062	Kotlin	2023-09-13 23:11:06
5	Isaac Owomugisha	2110	Kotlin	2020-09-03 15:16:48

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	3413	Lua	2023-11-14 01:11:41

#	User	Length	Language	Date
1	Thomas Feld	451	Python 2	2020-07-10 08:26:06
2	Andreas Björklund	579	Python 2	2019-05-19 07:33:16
3	Hidden user	669	Python 2	2018-02-16 22:18:53
4	Frederik Højholt	728	Python 2	2016-09-23 09:43:48
5	Lars Åström	734	Python 2	2018-06-23 21:50:50
6	Jessica Fang	782	Python 2	2017-02-12 06:53:17
7	Hidden user	784	Python 2	2017-02-16 19:02:50
8	Mohamed Badawy	820	Python 2	2015-06-28 14:22:02
9	Neal Zane	874	Python 2	2015-12-14 01:37:52
10	Lim Hong Hui Eugene	929	Python 2	2019-04-22 09:19:09

#	User	Length	Language	Date
1	Nikolaj Munk Binder Jensen	275	Python 3	2025-02-07 09:57:15
2	Simon Hellsten	316	Python 3	2023-08-12 17:34:14
3	Michael Goldwasser	350	Python 3	2025-09-04 15:50:13
4	Benjamin Z White	354	Python 3	2023-04-18 21:57:55
5	Markus	436	Python 3	2020-08-05 14:10:17
6	Sam Chen	461	Python 3	2025-09-24 23:56:53
7	Oskar Haarklou Veileborg	478	Python 3	2020-06-06 09:54:31
8	Magnus Eide-Fredriksen	528	Python 3	2024-07-14 15:58:07
9	Thibault Raffaillac	530	Python 3	2021-12-04 14:46:43
10	Troels Bjerre Lund	538	Python 3	2021-04-06 20:49:25

#	User	Length	Language	Date
1	Thomas Feld	176	Ruby	2023-08-29 06:59:59

#	User	Length	Language	Date
1	Artur Khuziakhmetov	1666	Rust	2025-02-03 08:51:55
2	Nicholas	1891	Rust	2023-08-09 12:23:52
3	Muhammad Sohail	2054	Rust	2024-09-20 05:52:06
4	Melker Forsberg	2666	Rust	2023-08-10 12:38:25
5	Jonathan Jiang	4013	Rust	2021-04-11 20:02:56
6	Mario Rodriguez	4136	Rust	2020-02-16 15:29:48
7	Hidden user	8067	Rust	2025-03-01 10:37:58
8	Chen Weikang	23603	Rust	2019-02-02 22:59:22
9	Daniel Anker Hermansen	24083	Rust	2022-12-30 10:01:17
10	Chaoyi Yin	25464	Rust	2019-02-02 22:56:45

Solution running time distribution