Problem A
A Towering Problem — Problem Statistics

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Submissions	6085
Accepted submissions	2492
Submission ratio	40.95%
Authors	2567
Full solves [?]	2211
Full solve Ratio	86.13%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.08 s	Bash	2024-04-16 16:52:46

#	User	Runtime	Language	Date
1	Love Engman	0.02 s	C#	2016-03-15 13:32:49
2	Khin Nyunt	0.02 s	C#	2016-04-20 10:28:47
3	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-05-11 22:49:41
4	Robert Low	0.02 s	C#	2016-08-10 18:28:01
5	Ludwig Hedeby	0.02 s	C#	2016-10-10 14:01:54
6	Robert Warnestam	0.02 s	C#	2017-02-17 17:14:44
7	Hallvard Braaten	0.02 s	C#	2017-03-22 16:33:15
8	Arne Hatlen	0.02 s	C#	2017-03-22 16:45:22
9	Rasmus Brants	0.02 s	C#	2017-05-13 21:56:23
10	Hidden user	0.02 s	C#	2017-07-12 17:52:52

#	User	Runtime	Language	Date
1	Simon Fontana Oscarsson	0.00 s	Go	2023-11-10 14:28:08
2	Kalai	0.00 s	Go	2025-12-23 11:06:02
3	Krzysztof Gibuła	0.07 s	Go	2019-01-19 01:01:36
4	Norbert Voelker	0.07 s	Go	2021-05-22 20:16:50
5	Brandon Ibbotson	0.08 s	Go	2017-01-14 07:04:30
6	Anthony Alves	0.08 s	Go	2018-02-04 04:43:01
7	Lanten Dev	0.09 s	Go	2022-10-24 16:05:45

#	User	Runtime	Language	Date
1	Johan Meier	0.00 s	Haskell	2017-01-15 12:10:07
2	César Antonio Carvajal de la Haza	0.00 s	Haskell	2017-04-18 16:33:20
3	Martin Jackson	0.00 s	Haskell	2017-05-23 17:11:03
4	Morten Lohne	0.00 s	Haskell	2017-09-13 18:04:38
5	Brent Yorgey	0.00 s	Haskell	2017-10-24 12:58:14
6	Yan Passeniouk	0.00 s	Haskell	2022-11-19 20:39:51
7	Mason Barnhill	0.00 s	Haskell	2023-09-15 23:22:34
8	Steinar Simonnes	0.00 s	Haskell	2024-03-22 18:06:09
9	Jason Hooper	0.01 s	Haskell	2019-08-29 00:04:49
10	Hidden user	0.01 s	Haskell	2019-09-22 15:57:31

#	User	Runtime	Language	Date
1	Guangyi Zhou	0.04 s	Java	2025-02-18 18:50:41
2	Daniel Gutierrez Duarte	0.04 s	Java	2025-02-27 18:56:55
3	Joshua Chin	0.04 s	Java	2025-08-22 10:54:30
4	Andreas Jansson	0.05 s	Java	2015-11-26 18:17:57
5	Dennis Shi	0.05 s	Java	2015-12-19 03:00:51
6	Michael Sullivan	0.05 s	Java	2015-12-26 22:49:04
7	Hidden user	0.05 s	Java	2016-01-30 22:11:44
8	Hidden user	0.05 s	Java	2016-08-17 16:13:14
9	Martijn Muijsers	0.05 s	Java	2016-10-01 18:53:32
10	Hidden user	0.05 s	Java	2016-10-18 20:41:59

#	User	Runtime	Language	Date
1	Rixin Yeetsho Dolma	0.04 s	JavaScript (Node.js)	2024-11-15 11:13:03
2	David Allert	0.04 s	JavaScript (Node.js)	2025-01-24 12:15:10
3	Henry Nguyen	0.05 s	JavaScript (Node.js)	2024-01-25 22:44:31
4	Linnea Olsson	0.05 s	JavaScript (Node.js)	2025-01-30 18:06:32
5	Khin Nyunt	0.42 s	JavaScript (Node.js)	2021-12-10 15:05:04
6	Niamh Limerick	0.42 s	JavaScript (Node.js)	2022-04-06 18:01:51

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-28 16:13:08
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-03 01:22:18
3	Mats Krüger Svensson	0.01 s	JavaScript (SpiderMonkey)	2017-03-22 16:00:51
4	Steffen Stenersen	0.01 s	JavaScript (SpiderMonkey)	2017-03-22 16:58:34
5	Øyvind Skaar	0.01 s	JavaScript (SpiderMonkey)	2017-03-22 18:51:48
6	Stian Surén	0.01 s	JavaScript (SpiderMonkey)	2017-04-14 16:57:51
7	Omar Saad	0.01 s	JavaScript (SpiderMonkey)	2017-09-13 18:10:42
8	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-03-01 19:39:19
9	Mas simo	0.02 s	JavaScript (SpiderMonkey)	2023-11-25 20:24:21
10	Bernard Perrin	0.03 s	JavaScript (SpiderMonkey)	2019-06-05 17:43:27

#	User	Runtime	Language	Date
1	Timothy Gaede	0.64 s	Julia	2024-06-06 07:51:49

#	User	Runtime	Language	Date
1	Benjamin Sølvberg Buan	0.15 s	Kotlin	2020-10-06 14:38:36
2	Phường Lên	0.19 s	Kotlin	2019-10-27 19:18:12
3	Dayan Ruben Gonzalez	0.20 s	Kotlin	2020-10-07 17:37:44
4	Adam Rankin	0.20 s	Kotlin	2023-08-29 01:40:30
5	Neil Harmon	0.22 s	Kotlin	2019-07-16 15:22:08
6	Colin Gay	0.24 s	Kotlin	2019-05-25 22:00:39
7	Ola Sundell	0.27 s	Kotlin	2024-10-30 19:33:53

#	User	Runtime	Language	Date
1	Sander de Haan	0.00 s	Lua	2025-05-07 15:04:53
2	teapo	0.00 s	Lua	2025-07-26 11:58:15
3	Juke	0.00 s	Lua	2025-07-26 12:38:02

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2020-01-03 00:59:57

#	User	Runtime	Language	Date
1	G V	0.01 s	PHP	2020-01-20 15:18:10
2	Susanne Ragnemalm	0.01 s	PHP	2023-10-28 22:47:47

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.01 s	Prolog	2016-02-04 11:05:21
2	Daniel Mitchell	0.02 s	Prolog	2017-09-28 00:58:53
3	Danny Robinson	0.03 s	Prolog	2023-11-19 05:28:06

#	User	Runtime	Language	Date
1	Christofer Ohlsson	0.02 s	Python 2	2015-10-31 09:34:48
2	Nick Wu	0.02 s	Python 2	2015-11-19 11:03:37
3	Syafiq Al Atiiq	0.02 s	Python 2	2016-06-28 19:04:09
4	Kasper Borys	0.02 s	Python 2	2016-10-09 11:28:30
5	Wei Peng	0.02 s	Python 2	2016-10-10 22:11:03
6	Hung Tran	0.02 s	Python 2	2016-10-10 22:22:08
7	Maksym Bendeberia	0.02 s	Python 2	2016-10-12 19:38:59
8	Erik Sillén	0.02 s	Python 2	2016-10-14 12:36:48
9	Edison Shi	0.02 s	Python 2	2016-10-26 02:46:28
10	Noah Ó Donnaile	0.02 s	Python 2	2016-11-22 23:29:01

#	User	Runtime	Language	Date
1	Håkon Verås	0.02 s	Python 3	2015-12-26 03:26:23
2	William Fiset	0.02 s	Python 3	2015-12-27 16:28:27
3	Wayne	0.02 s	Python 3	2016-01-21 12:44:57
4	Hidden user	0.02 s	Python 3	2016-01-29 13:02:56
5	Luca Della Vedova	0.02 s	Python 3	2016-02-02 23:14:26
6	Arnar Bjarni Arnarson	0.02 s	Python 3	2016-03-26 19:16:54
7	Atli Fannar Franklín	0.02 s	Python 3	2016-03-31 16:49:05
8	Samuel Dobson	0.02 s	Python 3	2016-04-27 05:49:11
9	Nicolas Marsceau	0.02 s	Python 3	2016-06-17 17:01:13
10	John William O'Rourke	0.02 s	Python 3	2016-09-11 22:02:31

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-02-13 12:43:05
2	Zohar Malamant	0.03 s	Ruby	2017-09-13 17:23:23
3	Nucleo Extensão em Tecnologia da Informação	0.05 s	Ruby	2019-06-01 20:57:48
4	Davi Guimarães Leite	0.05 s	Ruby	2019-06-07 20:07:10
5	Hidden user	0.05 s	Ruby	2021-03-11 13:21:11
6	Robert Haines	0.05 s	Ruby	2022-05-04 15:23:17
7	Thomas Feld	0.06 s	Ruby	2023-05-02 11:54:47
8	Clement Oh	0.07 s	Ruby	2024-02-09 06:24:32
9	Brooks Peterson	0.07 s	Ruby	2025-05-09 06:50:40

#	User	Runtime	Language	Date
1	Peter Toso	0.00 s	Swift	2025-05-16 08:02:11

#	User	Runtime	Language	Date
1	Cyril Chaize	0.05 s	TypeScript	2024-01-01 19:23:58

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Zig	2025-06-11 01:31:31

#	User	Length	Language	Date
1	Chenzhang Hu	1510	Bash	2024-04-16 16:52:46

#	User	Length	Language	Date
1	a_b__c	451	C	2021-02-03 19:19:01
2	Mirel Cosulschi	691	C	2022-12-04 16:51:36
3	Aviral Utkarsh	756	C	2017-02-20 19:58:57
4	Håvard Hansteen Nakling	779	C	2025-04-30 13:03:05
5	PhilCampbell	877	C	2021-02-24 17:39:10
6	Huy Dinh	883	C	2018-05-12 08:04:34
7	Hidden user	886	C	2024-03-08 02:39:13
8	Haobo Jiang	923	C	2016-09-30 10:26:00
9	WU DI	947	C	2023-01-04 17:04:40
10	Nucleo Extensão em Tecnologia da Informação	951	C	2019-06-01 22:37:38

#	User	Length	Language	Date
1	traxex	769	C#	2024-05-25 21:03:26
2	Wenlei Yu	1044	C#	2025-01-17 22:01:41
3	Arne Hatlen	1069	C#	2017-03-22 16:45:22
4	Chase Oberg	1272	C#	2018-02-12 12:29:02
5	Martin Olsson	1279	C#	2025-10-21 15:30:01
6	Tony Enberg	1347	C#	2025-10-27 12:49:19
7	Hallvard Braaten	1373	C#	2017-03-22 16:33:15
8	Robert Low	1374	C#	2016-08-10 18:28:01
9	Eric Weiss	1412	C#	2022-09-16 17:31:18
10	Elias Haloun	1473	C#	2024-10-16 11:13:34

#	User	Length	Language	Date
1	Antonio Molina Lovett	316	C++	2016-08-09 08:08:23
2	Scott MacIntosh	356	C++	2019-10-01 14:45:27
3	Vũ Ngọc Quốc Khánh	394	C++	2019-10-08 16:11:41
4	Giahuy Pham	401	C++	2019-10-03 14:29:45
5	Mic Rey	410	C++	2025-08-17 08:29:47
6	Duarte Nóbrega	431	C++	2018-12-22 15:46:57
7	Bryan Wong Wei Heng	435	C++	2020-02-07 14:05:37
8	Văn Trần	439	C++	2019-10-09 09:49:13
9	Yeung Man Tsung	441	C++	2022-11-20 11:42:17
10	Sơn Nguyễn	442	C++	2019-10-08 16:49:57

#	User	Length	Language	Date
1	Simon Fontana Oscarsson	902	Go	2023-11-10 14:28:08
2	Krzysztof Gibuła	976	Go	2019-01-19 01:01:36
3	Norbert Voelker	1072	Go	2021-05-22 20:16:50
4	Kalai	1080	Go	2025-12-23 11:06:02
5	Lanten Dev	1213	Go	2022-10-24 16:05:45
6	Anthony Alves	2067	Go	2018-02-04 04:43:01
7	Brandon Ibbotson	2680	Go	2017-01-14 07:04:30

#	User	Length	Language	Date
1	Shing Tak Lam	353	Haskell	2021-03-12 15:15:09
2	Greg Gorlen	494	Haskell	2024-02-18 02:31:42
3	Morten Lohne	519	Haskell	2017-09-13 18:04:38
4	Mason Barnhill	554	Haskell	2023-09-15 23:22:34
5	César Antonio Carvajal de la Haza	629	Haskell	2017-04-18 16:33:20
6	Steinar Simonnes	662	Haskell	2024-03-22 18:06:09
7	Yan Passeniouk	721	Haskell	2022-11-19 21:03:33
8	Rebeca Isabel González Gordillo	744	Haskell	2020-03-09 09:41:18
9	Brent Yorgey	773	Haskell	2017-10-24 12:58:14
10	Jan Hrček	850	Haskell	2021-04-01 07:32:49

#	User	Length	Language	Date
1	Doug Goodman	773	Java	2017-08-25 21:10:48
2	Duncan Page	773	Java	2018-02-05 23:38:57
3	Børge Bjørnstadjordet	779	Java	2023-12-24 02:10:53
4	Nathaniel	860	Java	2018-02-01 17:40:44
5	Micah Stairs	876	Java	2015-10-31 01:28:36
6	Mark Anthony Sumpay	876	Java	2017-08-08 17:58:36
7	Ahmed Amine Hachimi	880	Java	2016-12-11 23:37:36
8	Hidden user	890	Java	2017-09-13 17:54:44
9	Issam Baskati	893	Java	2016-12-11 23:31:02
10	Hidden user	897	Java	2018-02-01 07:17:40

#	User	Length	Language	Date
1	Henry Nguyen	1001	JavaScript (Node.js)	2024-01-25 22:44:31
2	David Allert	1338	JavaScript (Node.js)	2025-01-24 12:15:10
3	Rixin Yeetsho Dolma	1752	JavaScript (Node.js)	2024-11-15 11:13:03
4	Niamh Limerick	2104	JavaScript (Node.js)	2022-04-06 18:01:51
5	Linnea Olsson	2168	JavaScript (Node.js)	2025-01-30 18:06:32
6	Khin Nyunt	2841	JavaScript (Node.js)	2021-12-10 15:05:04

#	User	Length	Language	Date
1	Bernard Perrin	506	JavaScript (SpiderMonkey)	2019-06-05 17:43:27
2	Christian Pilegaard Cederquist	645	JavaScript (SpiderMonkey)	2023-03-01 19:39:19
3	Steffen Stenersen	739	JavaScript (SpiderMonkey)	2017-03-22 16:58:34
4	Bjørn Chr. Soltvedt	845	JavaScript (SpiderMonkey)	2016-02-03 01:22:18
5	Mas simo	869	JavaScript (SpiderMonkey)	2023-11-25 20:24:21
6	Peter Kedemo	1078	JavaScript (SpiderMonkey)	2015-12-28 16:13:08
7	Omar Saad	1087	JavaScript (SpiderMonkey)	2017-09-13 18:10:42
8	Mats Krüger Svensson	1094	JavaScript (SpiderMonkey)	2017-03-22 16:00:51
9	Øyvind Skaar	1455	JavaScript (SpiderMonkey)	2017-03-22 18:51:48
10	Stian Surén	2054	JavaScript (SpiderMonkey)	2017-04-14 16:57:51

#	User	Length	Language	Date
1	Timothy Gaede	495	Julia	2024-06-06 07:51:49

#	User	Length	Language	Date
1	Adam Rankin	689	Kotlin	2023-08-29 01:40:30
2	Benjamin Sølvberg Buan	891	Kotlin	2020-10-06 11:16:25
3	Phường Lên	968	Kotlin	2019-10-27 19:18:12
4	Colin Gay	1031	Kotlin	2019-05-25 22:00:39
5	Dayan Ruben Gonzalez	1212	Kotlin	2020-10-07 17:37:44
6	Neil Harmon	1499	Kotlin	2019-07-16 15:22:08
7	Ola Sundell	2440	Kotlin	2024-10-30 19:33:53

#	User	Length	Language	Date
1	Sander de Haan	654	Lua	2025-05-07 15:04:53
2	teapo	686	Lua	2025-07-26 11:58:15
3	Juke	949	Lua	2025-07-26 12:38:02

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1390	Pascal	2020-01-03 00:59:57

#	User	Length	Language	Date
1	G V	549	PHP	2020-01-20 15:18:10
2	Susanne Ragnemalm	2225	PHP	2023-10-28 22:47:47

#	User	Length	Language	Date
1	Danny Robinson	319	Prolog	2023-11-19 05:28:06
2	Daniel Mitchell	1929	Prolog	2017-09-28 00:58:53
3	Andriy Zyevakov	3080	Prolog	2016-02-04 11:05:21

#	User	Length	Language	Date
1	Hubert Teo	303	Python 2	2017-02-25 11:05:22
2	Justin Su	304	Python 2	2017-09-24 07:19:32
3	Cole Bite	306	Python 2	2017-05-03 21:32:53
4	Victor Zheng	330	Python 2	2017-07-08 23:34:58
5	Jesper Öqvist	335	Python 2	2018-10-26 18:02:22
6	Thomas Feld	341	Python 2	2019-09-05 12:36:52
7	Luca Della Vedova	359	Python 2	2016-02-02 23:23:16
8	Andreas Björklund	360	Python 2	2019-03-13 19:06:55
9	Maksym Bendeberia	365	Python 2	2016-10-12 19:38:59
10	Maisam Arif	393	Python 2	2017-01-25 08:23:55

#	User	Length	Language	Date
1	Daniel Bogorad	137	Python 3	2025-09-17 05:55:23
2	Benjamin Z White	155	Python 3	2023-04-22 22:04:59
3	Sterling Smith	157	Python 3	2025-02-24 20:28:42
4	Guk Yi Siong	170	Python 3	2024-01-28 16:23:19
5	Tai Tze Kin	197	Python 3	2024-05-04 19:07:47
6	Jack Rosenthal	214	Python 3	2016-10-22 20:45:30
7	Isaac Erdman	223	Python 3	2024-10-08 17:54:29
8	Elias Amha	230	Python 3	2020-12-16 18:28:35
9	Ahmed Chamseddine	230	Python 3	2024-09-11 10:43:09
10	Asger Hautop Drewsen	233	Python 3	2017-05-31 00:55:50

#	User	Length	Language	Date
1	Thomas Feld	81	Ruby	2023-08-29 15:27:51
2	Clement Oh	125	Ruby	2024-02-20 04:16:26
3	Zohar Malamant	233	Ruby	2017-09-13 17:23:23
4	Robert Haines	276	Ruby	2022-05-04 15:23:17
5	Casper Christensen	285	Ruby	2016-02-13 12:43:05
6	Hidden user	347	Ruby	2021-03-11 13:21:11
7	Nucleo Extensão em Tecnologia da Informação	443	Ruby	2019-06-01 20:57:48
8	Davi Guimarães Leite	443	Ruby	2019-06-07 20:07:10
9	Brooks Peterson	541	Ruby	2025-05-09 06:50:40

#	User	Length	Language	Date
1	Vincent Lagerros	835	Rust	2024-10-09 15:21:34
2	Zachary DeStefano	1132	Rust	2024-07-08 23:55:15
3	Ryan Mueller	1315	Rust	2023-10-17 14:55:42
4	David Rasch	1478	Rust	2023-09-29 16:30:40
5	Bas Dirks	1614	Rust	2022-01-17 09:37:25
6	Quentin Aubecq	1722	Rust	2024-10-18 14:55:55
7	Emil Østergaard	1904	Rust	2024-11-15 22:35:36
8	Mason Ginter	1969	Rust	2023-03-04 00:34:51
9	Joe Blower	2373	Rust	2025-11-04 18:20:43
10	Marcus Östling	2715	Rust	2024-01-07 11:03:22

#	User	Length	Language	Date
1	Peter Toso	1352	Swift	2025-05-16 08:02:11

#	User	Length	Language	Date
1	Cyril Chaize	2553	TypeScript	2024-01-01 19:23:58

#	User	Length	Language	Date
1	Hidden user	1876	Zig	2025-06-11 01:45:37

Solution running time distribution