Problem A
Rounded Buttons — Problem Statistics

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Submissions	1550
Accepted submissions	591
Submission ratio	38.13%
Authors	510
Full solves [?]	407
Full solve Ratio	79.80%

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.01 s	C	2018-11-01 17:34:06
2	Thomas Barnette	0.05 s	C	2017-10-10 01:02:06
3	Garðar Sigurðsson	0.05 s	C	2018-11-02 17:42:13
4	Simon Buan	0.05 s	C	2020-03-28 23:45:55
5	Sambit Palit	0.05 s	C	2020-11-01 21:43:26

#	User	Runtime	Language	Date
1	Armin Krauss	0.21 s	C#	2018-11-23 18:04:38
2	Martin Polansky	0.22 s	C#	2023-11-28 19:13:07
3	Andriy Zyevakov	0.25 s	C#	2018-11-30 23:02:04
4	Arpád Reštei	0.26 s	C#	2023-11-28 19:00:08
5	Rohan Johnson	0.32 s	C#	2022-11-03 16:48:50
6	Petra Marc	0.34 s	C#	2022-07-29 15:50:19
7	Lghoumaigui Youssef	0.46 s	C#	2020-03-02 20:38:37

#	User	Runtime	Language	Date
1	Gavin Gray	0.01 s	C++	2020-05-03 07:01:11
2	Alexander Kravberg	0.01 s	C++	2023-08-07 02:05:22
3	Michael Roberts	0.03 s	C++	2019-06-19 07:42:58
4	Tomas Lagland	0.04 s	C++	2017-03-17 22:10:12
5	Le Heng Chieu	0.04 s	C++	2017-09-03 09:25:14
6	Aman Karunakaran	0.04 s	C++	2017-09-08 02:53:47
7	Nick Wu	0.05 s	C++	2016-10-20 07:10:07
8	Steven Halim	0.05 s	C++	2017-09-22 05:25:31
9	Dmitry Lyubshin	0.05 s	C++	2018-05-26 09:50:54
10	Garðar Sigurðsson	0.05 s	C++	2018-11-02 17:38:46

#	User	Runtime	Language	Date
1	David Cawthon	0.55 s	Common Lisp	2019-05-17 03:27:54

#	User	Runtime	Language	Date
1	Erik Rairden	0.10 s	Go	2020-10-14 21:35:02
2	Norbert Voelker	0.36 s	Go	2021-08-23 22:27:03

#	User	Runtime	Language	Date
1	Brent Yorgey	0.50 s	Haskell	2017-11-25 06:08:45
2	Hidden user	0.56 s	Haskell	2023-02-16 09:07:24
3	Aivan Carson	0.82 s	Haskell	2018-11-11 15:39:53

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.11 s	Java	2022-05-10 20:58:37
2	Samuel Klingström	0.12 s	Java	2017-05-07 20:36:37
3	Bjørn Dons	0.14 s	Java	2020-11-24 21:02:44
4	Ahmad Barhamje	0.19 s	Java	2018-08-15 05:03:52
5	Martijn Muijsers	0.28 s	Java	2016-11-12 19:40:30
6	Sam Reinehr	0.30 s	Java	2018-09-13 00:54:36
7	Charley Sheaffer	0.31 s	Java	2018-10-21 19:38:45
8	Liam Keliher	0.32 s	Java	2017-04-28 01:50:53
9	Micah Stairs	0.33 s	Java	2016-12-29 05:20:33
10	Finn Lidbetter	0.34 s	Java	2017-05-12 00:36:06

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.15 s	JavaScript (SpiderMonkey)	2016-10-23 16:03:23
2	Christian Cederquist	0.22 s	JavaScript (SpiderMonkey)	2023-07-26 16:09:41
3	Peter Kedemo	0.26 s	JavaScript (SpiderMonkey)	2016-10-20 21:50:40

#	User	Runtime	Language	Date
1	Adam Rankin	0.90 s	Kotlin	2023-09-11 07:03:53

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.05 s	Pascal	2019-03-27 21:46:53

#	User	Runtime	Language	Date
1	Greg Hamerly	0.16 s	Python 2	2018-10-15 07:23:43
2	Øyvind Haarberg	0.17 s	Python 2	2017-10-13 20:54:40
3	Duncan Page	0.18 s	Python 2	2017-10-10 00:38:25
4	Johan Lyts	0.18 s	Python 2	2020-08-06 22:19:28
5	Harald Andersson	0.19 s	Python 2	2017-08-25 15:28:47
6	Maj Stenmark	0.19 s	Python 2	2019-09-15 17:07:48
7	Thomas Feld	0.20 s	Python 2	2019-09-24 10:28:57
8	Johann Ly	0.22 s	Python 2	2018-09-30 07:46:19
9	Jesper Öqvist	0.23 s	Python 2	2018-10-27 19:03:45
10	Hidden user	0.25 s	Python 2	2018-06-10 22:13:19

#	User	Runtime	Language	Date
1	Yang Li	0.12 s	Python 3	2019-03-13 22:54:25
2	Trym Kvitnes	0.13 s	Python 3	2025-03-10 16:12:01
3	Vebjørn Søreide Øiestad	0.13 s	Python 3	2025-03-10 17:47:41
4	Jonas Haukenes	0.13 s	Python 3	2025-03-26 16:15:46
5	Torstein Strømme	0.14 s	Python 3	2017-10-13 20:53:02
6	Isaac Erdman	0.14 s	Python 3	2024-08-21 04:56:35
7	Jiaming Kong	0.14 s	Python 3	2025-08-07 10:54:04
8	Hugo Alayrangues	0.15 s	Python 3	2019-07-24 16:32:44
9	Simon Andersen	0.15 s	Python 3	2023-03-10 12:22:56
10	Marius Hatland	0.15 s	Python 3	2023-03-14 13:33:26

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.01 s	Rust	2024-07-25 02:12:22
2	David Rasch	0.09 s	Rust	2022-10-24 16:18:20
3	Daniel Liland	0.12 s	Rust	2023-03-09 11:51:52
4	Rolf Martin Glomsrud	0.12 s	Rust	2023-03-28 21:00:34
5	Otakar Hirs	0.13 s	Rust	2023-03-17 16:25:57

#	User	Length	Language	Date
1	Garðar Sigurðsson	1203	C	2018-11-02 17:42:13
2	Sambit Palit	1341	C	2020-11-01 21:43:26
3	Simon Buan	1808	C	2020-03-28 23:45:55
4	Thomas Barnette	2506	C	2017-10-10 01:02:06
5	Bergur Snorrason	5647	C	2018-11-01 17:34:06

#	User	Length	Language	Date
1	Armin Krauss	1581	C#	2018-11-23 18:04:38
2	Rohan Johnson	2488	C#	2022-11-03 16:48:50
3	Arpád Reštei	2627	C#	2023-11-28 19:00:08
4	Lghoumaigui Youssef	2743	C#	2020-03-02 20:38:37
5	Petra Marc	2760	C#	2022-07-29 15:50:19
6	Andriy Zyevakov	4611	C#	2018-11-30 23:02:04
7	Martin Polansky	5863	C#	2023-11-28 19:13:07

#	User	Length	Language	Date
1	Rafael Kristoforus Yanto	545	C++	2025-05-09 20:40:42
2	Johan Wind	743	C++	2018-05-14 00:34:25
3	a_b__c	758	C++	2021-02-26 10:26:58
4	Hidden user	802	C++	2020-03-16 11:14:03
5	Vincent Tandya	815	C++	2018-06-24 12:41:42
6	人外沙耶	841	C++	2021-03-31 19:24:21
7	Hidden user	851	C++	2018-06-23 10:58:50
8	Leonardo Blanger	866	C++	2021-03-05 02:19:26
9	Hidden user	879	C++	2017-07-21 02:08:41
10	Michael Chen	882	C++	2020-11-22 15:40:21

#	User	Length	Language	Date
1	David Cawthon	1865	Common Lisp	2019-05-17 03:27:54

#	User	Length	Language	Date
1	Norbert Voelker	1398	Go	2021-08-23 22:28:55
2	Erik Rairden	2722	Go	2020-10-03 17:49:34

#	User	Length	Language	Date
1	Aivan Carson	858	Haskell	2018-11-10 18:38:33
2	Hidden user	1051	Haskell	2023-02-16 09:07:24
3	Brent Yorgey	1423	Haskell	2017-11-25 06:08:45

#	User	Length	Language	Date
1	Doug Goodman	1117	Java	2018-04-23 15:50:15
2	Sam Reinehr	1368	Java	2018-09-13 00:54:36
3	Carolyn Wang	1434	Java	2022-10-29 22:56:19
4	Samuel Klingström	1608	Java	2017-03-20 21:06:24
5	Finn Lidbetter	1694	Java	2017-05-12 00:36:06
6	Rob Hochberg	1695	Java	2021-01-14 16:15:45
7	Crystal Sharpe	1717	Java	2020-05-05 21:54:51
8	Mark Sturtevant	1738	Java	2020-05-02 19:22:37
9	Eric Leow Yu Quan	1813	Java	2021-01-04 06:06:46
10	Adam Zhu	1864	Java	2022-10-29 20:47:28

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	1069	JavaScript (SpiderMonkey)	2016-10-23 16:03:23
2	Christian Cederquist	1092	JavaScript (SpiderMonkey)	2023-07-26 16:09:41
3	Peter Kedemo	1220	JavaScript (SpiderMonkey)	2016-10-20 21:49:34

#	User	Length	Language	Date
1	Adam Rankin	2082	Kotlin	2023-09-11 07:03:53

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1168	Pascal	2019-03-27 21:46:53

#	User	Length	Language	Date
1	Thomas Feld	575	Python 2	2019-09-24 10:28:57
2	Duncan Page	706	Python 2	2017-10-10 00:38:25
3	Jesper Öqvist	724	Python 2	2018-10-27 19:03:45
4	Greg Hamerly	795	Python 2	2018-10-15 07:23:43
5	Harald Andersson	895	Python 2	2017-08-25 15:28:47
6	Hidden user	919	Python 2	2018-06-10 22:13:19
7	Johan Lyts	984	Python 2	2020-08-06 22:19:28
8	Yanmarshus Bachtiar	1067	Python 2	2020-09-09 04:39:55
9	Maj Stenmark	1131	Python 2	2019-09-15 17:07:48
10	Johann Ly	1311	Python 2	2018-09-30 07:46:19

#	User	Length	Language	Date
1	Lawry Sorenson	280	Python 3	2023-07-08 00:59:35
2	Ahmed Chamseddine	427	Python 3	2025-08-26 00:30:02
3	Thibault Raffaillac	457	Python 3	2021-12-06 12:58:12
4	Shashank Bhatt	475	Python 3	2024-08-20 04:14:59
5	François Moutier	507	Python 3	2020-04-05 12:47:20
6	Isaac Erdman	510	Python 3	2024-08-21 04:56:35
7	Xiu-Heng Hua	528	Python 3	2021-12-07 22:52:44
8	Årne Reime	536	Python 3	2023-03-14 15:23:32
9	Simon Andersen	563	Python 3	2023-03-10 12:27:15
10	Oskar Haarklou Veileborg	642	Python 3	2020-02-13 13:19:47

#	User	Length	Language	Date
1	David Rasch	1499	Rust	2022-10-24 16:18:20
2	Daniel Liland	2385	Rust	2023-03-09 11:51:52
3	Otakar Hirs	3847	Rust	2023-03-17 16:25:57
4	Rolf Martin Glomsrud	3926	Rust	2023-05-15 03:10:41
5	Vincent Lagerros	6655	Rust	2024-07-25 02:12:22

Solution running time distribution