Problem A
Association for Computing Machinery — Problem Statistics

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Submissions	3237
Accepted submissions	1255
Submission ratio	38.77%
Authors	1222
Full solves [?]	1078
Full solve Ratio	88.22%

#	User	Runtime	Language	Date
1	Jens Mossig	0.02 s	C#	2015-12-25 13:23:57
2	Robert Low	0.02 s	C#	2016-07-17 14:03:48
3	Khin Nyunt	0.02 s	C#	2017-04-09 10:59:04
4	Armin Krauss	0.02 s	C#	2018-11-24 16:13:40
5	Peter Konnerup Moss	0.02 s	C#	2019-10-18 10:25:41
6	Viktor Máni Mönster	0.02 s	C#	2020-05-26 18:15:33
7	Mikael Fiala-Lundström	0.03 s	C#	2022-01-19 19:06:54

#	User	Runtime	Language	Date
1	Norbert Voelker	0.08 s	Go	2021-08-22 21:36:31

#	User	Runtime	Language	Date
1	Paolo Capriotti	0.00 s	Haskell	2016-09-30 14:52:33
2	Hidden user	0.00 s	Haskell	2023-01-12 21:08:14
3	Steinar Simonnes	0.00 s	Haskell	2024-07-16 15:50:39
4	Brent Yorgey	0.01 s	Haskell	2017-11-08 03:28:24
5	Hidden user	0.01 s	Haskell	2019-11-11 12:44:12

#	User	Runtime	Language	Date
1	Issa Issack	0.04 s	Java	2025-02-15 23:15:59
2	Sven Rönnbäck	0.04 s	Java	2025-05-30 20:38:41
3	Nick Wu	0.05 s	Java	2015-12-10 02:16:26
4	Sumeet Varma	0.05 s	Java	2015-12-10 02:28:04
5	Poik Niok	0.05 s	Java	2015-12-10 02:39:15
6	Hidden user	0.05 s	Java	2015-12-10 12:13:09
7	Trung Nguyen	0.05 s	Java	2015-12-13 09:58:08
8	Brandon Morris	0.05 s	Java	2015-12-14 21:01:53
9	Dennis Shi	0.05 s	Java	2015-12-20 19:00:33
10	Łukasz Antkowiak	0.05 s	Java	2015-12-24 23:08:14

#	User	Runtime	Language	Date
1	Minh Trang Nguyen	0.04 s	JavaScript (Node.js)	2026-01-16 16:16:51
2	Khin Nyunt	0.42 s	JavaScript (Node.js)	2021-12-12 07:27:51

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-20 16:51:56
2	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2016-04-03 21:03:04
3	J M	0.01 s	JavaScript (SpiderMonkey)	2016-11-21 01:03:13
4	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-05-23 10:52:40

#	User	Runtime	Language	Date
1	Timothy Gaede	0.54 s	Julia	2024-08-12 07:26:23

#	User	Runtime	Language	Date
1	Hidden user	0.15 s	Kotlin	2020-02-04 19:46:16
2	Dayan Ruben Gonzalez	0.17 s	Kotlin	2020-09-29 17:45:16
3	Neil Harmon	0.20 s	Kotlin	2019-10-18 10:41:39
4	Adam Rankin	0.20 s	Kotlin	2023-08-31 01:36:19

#	User	Runtime	Language	Date
1	Greg Hamerly	0.02 s	Python 2	2015-12-10 02:49:01
2	Khoai Pham	0.02 s	Python 2	2015-12-10 07:49:01
3	Christofer Ohlsson	0.02 s	Python 2	2015-12-10 10:39:12
4	Frederik Højholt	0.02 s	Python 2	2015-12-11 15:42:56
5	Erik Sillén	0.02 s	Python 2	2015-12-14 21:03:36
6	Kenn Daniel	0.02 s	Python 2	2015-12-27 11:24:02
7	Alexander Teno	0.02 s	Python 2	2016-03-18 17:58:31
8	Jonathan Balls	0.02 s	Python 2	2016-09-30 15:31:28
9	Asher Trockman	0.02 s	Python 2	2016-10-20 00:12:28
10	Ibukunoluwa Oluwayomi	0.02 s	Python 2	2016-12-18 06:58:38

#	User	Runtime	Language	Date
1	Anja Trop	0.02 s	Python 3	2016-03-16 22:04:38
2	Johan Sannemo	0.02 s	Python 3	2016-04-04 11:25:10
3	অম্লান সাহা	0.02 s	Python 3	2016-05-24 10:24:25
4	Lucia Pál (Simanová)	0.02 s	Python 3	2016-06-15 03:11:04
5	Nathan Collins	0.02 s	Python 3	2016-08-16 23:23:32
6	Evan Higgins	0.02 s	Python 3	2016-10-19 23:54:05
7	Óðinn Eyjólfsson	0.02 s	Python 3	2016-10-21 18:43:45
8	Jack Rosenthal	0.02 s	Python 3	2016-10-22 18:33:01
9	John Barczynski	0.02 s	Python 3	2016-10-29 06:59:50
10	Rick May	0.02 s	Python 3	2017-03-02 03:53:01

#	User	Runtime	Language	Date
1	Erik Rydbert	0.03 s	Ruby	2016-07-15 08:11:02
2	Phirasit Charoenchitseriwong	0.03 s	Ruby	2016-12-11 09:27:07
3	Thomas Feld	0.06 s	Ruby	2023-05-02 13:18:52

#	User	Runtime	Language	Date
1	Eric Pinter	0.00 s	Rust	2020-07-27 16:42:35
2	Bas Dirks	0.00 s	Rust	2024-01-27 10:09:56

#	User	Length	Language	Date
1	Tjandra Satria Gunawan	335	C	2015-12-10 02:43:33
2	Ivan Petrov	660	C	2019-08-08 09:17:34
3	Andrew Roberts	775	C	2017-09-25 07:46:43
4	Haobo Jiang	818	C	2016-09-30 14:17:25
5	Samuel Nzembele	974	C	2019-05-04 12:44:34
6	Ng Wei Jie	974	C	2020-02-17 14:06:53
7	Amy Jane Aurellano	974	C	2022-12-09 08:14:04
8	Pranit	974	C	2023-01-26 21:19:05
9	THANISH K	1008	C	2025-04-21 19:56:47
10	Jón Steinn Elíasson	1019	C	2017-07-08 15:49:16

#	User	Length	Language	Date
1	Peter Konnerup Moss	918	C#	2019-10-18 10:25:41
2	Armin Krauss	1056	C#	2018-11-24 16:13:40
3	Viktor Máni Mönster	1224	C#	2020-05-26 18:15:33
4	Robert Low	1351	C#	2016-07-17 14:03:48
5	Jens Mossig	1469	C#	2015-12-25 13:23:57
6	Khin Nyunt	1495	C#	2017-04-09 10:59:04
7	Mikael Fiala-Lundström	1753	C#	2022-01-19 19:06:54

#	User	Length	Language	Date
1	Neal Zane	283	C++	2016-04-03 19:39:43
2	Antonio Molina Lovett	316	C++	2016-08-07 09:46:38
3	Richard Putra	317	C++	2018-02-20 09:10:56
4	Saykot Saha	353	C++	2016-03-10 11:49:17
5	Myungwoo Chun	354	C++	2015-12-11 07:45:48
6	Keefe Johnson	357	C++	2017-05-30 09:06:16
7	Andreas Cendranata	365	C++	2019-01-25 06:55:47
8	Hrant Hovhannisyan	370	C++	2017-04-20 10:04:40
9	Ba Nyar Naing	374	C++	2017-10-11 10:30:41
10	hk	379	C++	2022-10-22 13:18:24

#	User	Length	Language	Date
1	Norbert Voelker	988	Go	2021-08-22 21:36:31

#	User	Length	Language	Date
1	Brent Yorgey	473	Haskell	2017-11-08 03:28:24
2	Hidden user	561	Haskell	2023-01-12 21:08:14
3	Steinar Simonnes	572	Haskell	2024-07-16 15:51:41
4	Paolo Capriotti	605	Haskell	2016-09-30 14:52:33
5	Hidden user	12231	Haskell	2019-11-11 12:44:12

#	User	Length	Language	Date
1	Hidden user	497	Java	2016-09-17 02:04:14
2	Duncan Page	600	Java	2017-11-09 23:32:51
3	Mouhssine Assaoud	631	Java	2016-12-09 03:51:44
4	Stela Palii	640	Java	2017-12-14 06:08:10
5	Åke Wettergren	651	Java	2019-11-25 15:58:28
6	Simon Xue	662	Java	2015-12-20 15:59:10
7	Reinald Kim T. Amplayo	672	Java	2015-12-10 10:36:09
8	Alvin Yan	675	Java	2018-07-12 05:05:09
9	Doug Goodman	678	Java	2017-07-12 20:32:00
10	Gan Hong Yao	685	Java	2021-05-05 05:30:35

#	User	Length	Language	Date
1	Minh Trang Nguyen	1043	JavaScript (Node.js)	2026-01-16 16:16:51
2	Khin Nyunt	1488	JavaScript (Node.js)	2021-12-12 07:27:51

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	157	JavaScript (SpiderMonkey)	2023-05-23 11:19:55
2	Bjørn Chr. Soltvedt	434	JavaScript (SpiderMonkey)	2016-02-20 16:51:56
3	Peter Kedemo	474	JavaScript (SpiderMonkey)	2016-04-03 21:03:04
4	J M	503	JavaScript (SpiderMonkey)	2016-11-21 01:03:13

#	User	Length	Language	Date
1	Timothy Gaede	1114	Julia	2024-08-12 07:26:23

#	User	Length	Language	Date
1	Adam Rankin	544	Kotlin	2023-08-31 01:36:19
2	Dayan Ruben Gonzalez	553	Kotlin	2020-09-29 17:45:16
3	Hidden user	1002	Kotlin	2020-02-04 19:46:16
4	Neil Harmon	1288	Kotlin	2019-10-18 10:41:39

#	User	Length	Language	Date
1	Thomas Feld	186	Python 2	2019-11-20 10:47:28
2	Johan Lyts	227	Python 2	2019-05-11 21:52:02
3	Khoai Pham	277	Python 2	2015-12-10 07:49:01
4	Hidden user	288	Python 2	2019-07-13 10:36:56
5	Alexander Teno	308	Python 2	2016-03-18 17:58:31
6	Guan Yang Ze	311	Python 2	2019-09-27 10:50:07
7	Haggai Liu	339	Python 2	2017-03-28 03:33:08
8	Mukerem Ali Nur	354	Python 2	2019-11-27 07:42:00
9	Maj Stenmark	358	Python 2	2019-09-13 17:26:14
10	Josenildo Silva	366	Python 2	2017-05-02 18:15:57

#	User	Length	Language	Date
1	Peter Stauder	158	Python 3	2022-08-28 22:54:33
2	Yong Mao	172	Python 3	2023-07-02 22:51:27
3	Farzam Abrishami	174	Python 3	2024-02-06 20:23:48
4	Ahmed Chamseddine	190	Python 3	2024-09-18 10:26:47
5	Noah Hessen Bjerke	190	Python 3	2025-11-08 19:56:01
6	Charles Ancheta	195	Python 3	2023-04-13 01:17:17
7	Andreas Björklund	197	Python 3	2023-05-03 18:43:03
8	Tai Tze Kin	201	Python 3	2024-05-04 10:36:29
9	Daniel Bogorad	217	Python 3	2026-01-19 15:03:32
10	Nicholas Russell Saerang	223	Python 3	2023-07-16 19:45:19

#	User	Length	Language	Date
1	Thomas Feld	88	Ruby	2023-05-02 13:28:32
2	Phirasit Charoenchitseriwong	309	Ruby	2016-12-11 09:27:07
3	Erik Rydbert	425	Ruby	2016-07-15 08:11:02

#	User	Length	Language	Date
1	Bas Dirks	1120	Rust	2024-01-27 10:09:56
2	Eric Pinter	1310	Rust	2020-07-27 16:42:35

Solution running time distribution