Problem A
Grandpa Bernie — Problem Statistics

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Submissions	11001
Accepted submissions	4148
Submission ratio	37.71%
Authors	3350
Full solves [?]	2885
Full solve Ratio	86.12%

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.07 s	C	2018-12-20 17:31:30
2	Hidden user	0.09 s	C	2017-06-06 07:51:10
3	Martin Stensgård	0.10 s	C	2021-01-02 23:57:36
4	Sami Al Chalati	0.13 s	C	2024-10-24 18:44:34

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.19 s	C#	2019-05-15 15:03:09
2	Klas af Geijerstam	0.26 s	C#	2016-12-14 13:23:57
3	Martin Wedege Hansen	0.37 s	C#	2023-01-31 15:12:18
4	Andreas Kongstad	0.42 s	C#	2023-01-31 13:03:49
5	Casey Hofland	0.46 s	C#	2017-09-04 11:14:50
6	Yuwono Bangun Nagoro	0.47 s	C#	2016-11-09 10:33:29
7	Tristan Close	0.47 s	C#	2017-04-01 06:35:19
8	Jie He	0.48 s	C#	2017-04-29 16:14:42
9	Chris Wong	0.59 s	C#	2021-02-14 23:42:55
10	Umar Rasyid	0.60 s	C#	2025-01-01 05:50:13

#	User	Runtime	Language	Date
1	Øyvind Almli	0.03 s	C++	2022-07-11 22:44:22
2	Hidden user	0.04 s	C++	2017-06-06 07:26:02
3	Agis Daniels	0.04 s	C++	2021-12-17 17:12:22
4	Jim Zheng	0.05 s	C++	2020-02-11 19:01:35
5	Grae Yeandle	0.06 s	C++	2017-01-28 13:32:21
6	Mohammad Sadeghi	0.06 s	C++	2019-08-13 20:19:54
7	Zhang Jikun	0.06 s	C++	2022-07-13 15:41:09
8	Lee Geng Yu	0.07 s	C++	2018-03-04 10:35:30
9	Marcin Chłond	0.07 s	C++	2018-03-16 16:00:42
10	Tan Yuan Cai	0.07 s	C++	2018-04-04 04:28:45

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.38 s	F#	2023-03-06 17:22:20

#	User	Runtime	Language	Date
1	Nathan Lee	0.25 s	Go	2025-09-24 20:42:27
2	Husain Satan	0.47 s	Go	2023-11-06 12:51:07
3	Sander Hellesø	0.56 s	Go	2019-04-19 03:46:28
4	Krzysztof Gibuła	0.59 s	Go	2021-05-09 19:50:23
5	James Robb	0.66 s	Go	2020-04-29 21:31:52
6	James Robb	0.66 s	Go	2020-05-12 10:03:10

#	User	Runtime	Language	Date
1	Øyvind Almli	0.42 s	Haskell	2022-05-21 13:48:14
2	BlackcapCoder	0.49 s	Haskell	2019-05-10 18:28:58
3	Brent Yorgey	0.61 s	Haskell	2018-10-15 16:07:03
4	Hidden user	0.96 s	Haskell	2021-07-15 16:33:25

#	User	Runtime	Language	Date
1	Clement Oh	0.19 s	Java	2022-08-27 17:01:18
2	Sven Rönnbäck	0.23 s	Java	2022-11-27 14:48:01
3	Asmus Tørsleff	0.32 s	Java	2022-02-01 10:04:40
4	William Fiset	0.36 s	Java	2016-07-16 02:20:06
5	Emil Bak-Møller	0.36 s	Java	2021-02-02 10:39:19
6	Samuel Klingström	0.39 s	Java	2017-07-22 09:54:45
7	Darko Aleksic	0.42 s	Java	2020-03-20 06:34:31
8	Jakob Kallestad	0.45 s	Java	2018-09-29 09:46:55
9	Rachel Krohn	0.47 s	Java	2025-03-14 21:14:01
10	Ninghui Li	0.48 s	Java	2020-02-18 04:02:10

#	User	Runtime	Language	Date
1	Alexander Fang	0.45 s	JavaScript (Node.js)	2025-03-28 15:59:44
2	Christopher Walther	0.74 s	JavaScript (Node.js)	2021-04-16 23:40:09
3	Nicklas Østerberg	0.93 s	JavaScript (Node.js)	2025-01-31 11:22:42
4	Róbert Kristian Freysson	0.96 s	JavaScript (Node.js)	2023-03-18 15:03:13

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.30 s	JavaScript (SpiderMonkey)	2023-06-08 15:04:42
2	Bjørn Chr. Soltvedt	0.39 s	JavaScript (SpiderMonkey)	2016-04-26 22:03:00
3	Cole Rauh	0.41 s	JavaScript (SpiderMonkey)	2016-10-16 23:00:57
4	Christopher Walther	0.45 s	JavaScript (SpiderMonkey)	2021-04-16 23:33:07
5	Andri Rafn	0.57 s	JavaScript (SpiderMonkey)	2018-04-24 18:18:02
6	Peter Kedemo	0.60 s	JavaScript (SpiderMonkey)	2016-06-01 17:05:22
7	Zach Tschetter	0.69 s	JavaScript (SpiderMonkey)	2023-05-25 18:51:24

#	User	Runtime	Language	Date
1	Jahid Hasan Imon	0.63 s	Kotlin	2020-08-26 23:27:23
2	Johnny Baloney	0.65 s	Kotlin	2022-01-16 14:28:44
3	Hidden user	0.75 s	Kotlin	2019-12-16 04:10:12
4	Phường Lên	0.76 s	Kotlin	2019-12-16 06:47:00
5	Adam Koprowski	0.84 s	Kotlin	2020-08-29 22:17:55
6	Benjamin Laurence Erickson	0.85 s	Kotlin	2018-07-20 18:22:00

#	User	Runtime	Language	Date
1	Bjarni Jens Kristinsson	0.15 s	Python 2	2019-05-05 19:06:19
2	Christofer Ohlsson	0.16 s	Python 2	2016-04-26 05:35:34
3	Ho Yin Ng	0.16 s	Python 2	2016-10-19 00:29:01
4	Rachel Campbell	0.16 s	Python 2	2017-02-03 05:55:43
5	Maksym Bendeberia	0.16 s	Python 2	2017-07-03 14:58:09
6	Hidden user	0.16 s	Python 2	2018-02-02 22:33:12
7	Kristrún Skúladóttir	0.16 s	Python 2	2019-05-13 21:32:56
8	Jessica Fang	0.17 s	Python 2	2017-01-30 05:08:16
9	Denis Godunov	0.17 s	Python 2	2017-05-31 10:21:53
10	Brynjar Sigurðsson	0.17 s	Python 2	2018-04-24 16:27:29

#	User	Runtime	Language	Date
1	Petr	0.14 s	Python 3	2025-07-13 20:02:37
2	Avery	0.16 s	Python 3	2025-08-04 06:50:52
3	Øyvind Almli	0.17 s	Python 3	2021-11-15 16:09:17
4	Hidden user	0.18 s	Python 3	2025-02-07 21:31:46
5	Pan Boyi	0.19 s	Python 3	2022-11-02 10:38:06
6	Christian Emil Stender	0.19 s	Python 3	2023-01-31 14:45:50
7	Rebecca Jackson	0.19 s	Python 3	2024-12-27 03:08:58
8	Nicolas Ladendorf	0.19 s	Python 3	2025-02-07 21:21:02
9	Hidden user	0.19 s	Python 3	2025-02-07 21:44:52
10	Alexander Thoren	0.19 s	Python 3	2025-02-13 09:20:56

#	User	Runtime	Language	Date
1	Hidden user	0.35 s	Ruby	2019-03-29 14:52:04
2	Andreas Severin Hauch Trøstrup	0.40 s	Ruby	2023-02-03 00:10:44
3	Kieran Maharaj	0.46 s	Ruby	2020-07-04 09:00:02
4	Thomas Feld	0.49 s	Ruby	2023-05-04 11:23:44
5	Frederik Petersen	0.58 s	Ruby	2023-02-02 13:24:46

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.02 s	Rust	2025-06-01 15:01:40
2	Joe Blower	0.04 s	Rust	2025-08-11 00:27:01
3	Florian Nagel	0.07 s	Rust	2019-10-30 20:54:32
4	Connor Skees	0.07 s	Rust	2020-10-25 18:07:20
5	Pahlevi Fikri Auliya	0.07 s	Rust	2020-11-01 23:37:18
6	Marcus Östling	0.07 s	Rust	2024-03-03 19:47:56
7	Egor Kulikov	0.07 s	Rust	2024-12-20 11:45:38
8	Aaron Lengyel	0.14 s	Rust	2022-11-10 06:58:12
9	Malthe Mathias Mølgaard Larsen	0.17 s	Rust	2023-01-31 15:57:33
10	Malte Kildelund Rosenkilde	0.19 s	Rust	2025-02-04 08:27:48

#	User	Length	Language	Date
1	Martin Stensgård	2083	C	2020-05-31 23:38:12
2	Sami Al Chalati	2202	C	2024-10-24 18:44:34
3	Hidden user	3470	C	2017-06-06 07:51:10
4	Bergur Snorrason	5559	C	2018-12-20 17:31:30

#	User	Length	Language	Date
1	Tristan Close	778	C#	2017-04-01 06:35:19
2	Rasmus Bondo Hansen	986	C#	2025-06-23 14:48:09
3	Hidden user	1017	C#	2022-02-01 10:44:34
4	Jie He	1128	C#	2017-04-29 16:14:42
5	Martin Wedege Hansen	1140	C#	2023-01-31 15:12:18
6	Yuwono Bangun Nagoro	1168	C#	2016-11-09 10:33:29
7	Hamdanil Rasyid	1313	C#	2024-12-30 16:05:51
8	Umar Rasyid	1363	C#	2025-01-01 05:50:13
9	Linda Andersson	1391	C#	2021-08-25 14:09:16
10	Casey Hofland	1426	C#	2017-09-04 11:14:50

#	User	Length	Language	Date
1	Randall Rinehart	240	C++	2024-02-21 05:32:39
2	Matthew Shank	259	C++	2024-02-19 03:03:11
3	Mugeon Kim	351	C++	2024-03-15 00:47:00
4	Josephine Tanadi	361	C++	2018-03-31 19:31:25
5	Mustefa Kamil	367	C++	2020-12-25 07:28:13
6	JY Loh	371	C++	2022-12-09 11:28:39
7	Putra Mohammad Danish Bin Mohd Rafee	383	C++	2018-04-05 16:46:20
8	Mustefa Kamil	387	C++	2021-03-31 13:48:21
9	Yeung Man Tsung	388	C++	2022-06-21 16:13:17
10	Chuck Fernández	401	C++	2016-09-23 22:29:56

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1178	F#	2023-03-06 17:22:20

#	User	Length	Language	Date
1	Krzysztof Gibuła	733	Go	2021-05-09 19:50:23
2	Nathan Lee	1060	Go	2025-09-24 20:42:27
3	Sander Hellesø	1341	Go	2019-04-19 03:46:28
4	Husain Satan	1343	Go	2023-11-06 12:51:07
5	James Robb	1530	Go	2020-04-29 21:31:52
6	James Robb	1530	Go	2020-05-12 10:03:10

#	User	Length	Language	Date
1	BlackcapCoder	553	Haskell	2019-05-10 10:56:02
2	Brent Yorgey	1184	Haskell	2018-10-15 16:07:03
3	Øyvind Almli	1299	Haskell	2021-11-15 06:28:24
4	Hidden user	14878	Haskell	2021-07-15 16:33:25

#	User	Length	Language	Date
1	Mitch Price	777	Java	2016-10-05 22:51:59
2	Javier Lee	805	Java	2023-10-08 18:51:48
3	Kaung Htet Wai Yan	870	Java	2023-06-04 16:21:05
4	Jeremy Lim	964	Java	2023-11-20 07:32:39
5	Hoo Kai Sng	989	Java	2024-04-25 14:24:41
6	Eric Leow Yu Quan	1003	Java	2021-03-04 14:56:53
7	Liu Shuyang	1010	Java	2020-03-05 05:07:45
8	Ng Thanapol	1010	Java	2025-03-25 07:58:37
9	Lauren Ji	1023	Java	2022-04-09 15:42:48
10	Abdelrahman Mokbel	1024	Java	2022-10-03 20:34:59

#	User	Length	Language	Date
1	Róbert Kristian Freysson	1034	JavaScript (Node.js)	2023-03-18 15:03:13
2	Alexander Fang	1058	JavaScript (Node.js)	2025-03-28 15:59:44
3	Christopher Walther	1222	JavaScript (Node.js)	2021-04-16 23:40:09
4	Nicklas Østerberg	1309	JavaScript (Node.js)	2025-01-30 19:31:27

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	357	JavaScript (SpiderMonkey)	2023-06-08 15:01:27
2	Bjørn Chr. Soltvedt	371	JavaScript (SpiderMonkey)	2016-04-26 22:03:00
3	Cole Rauh	413	JavaScript (SpiderMonkey)	2016-10-16 23:00:57
4	Zach Tschetter	531	JavaScript (SpiderMonkey)	2023-05-25 18:54:08
5	Peter Kedemo	562	JavaScript (SpiderMonkey)	2016-06-01 17:05:22
6	Andri Rafn	569	JavaScript (SpiderMonkey)	2018-04-24 18:18:02
7	Christopher Walther	1003	JavaScript (SpiderMonkey)	2021-04-16 23:33:07

#	User	Length	Language	Date
1	Benjamin Laurence Erickson	792	Kotlin	2018-07-20 18:22:00
2	Phường Lên	869	Kotlin	2019-12-16 06:47:00
3	Adam Koprowski	980	Kotlin	2020-08-29 22:17:55
4	Johnny Baloney	1005	Kotlin	2022-01-16 14:28:44
5	Hidden user	1026	Kotlin	2019-12-16 04:10:12
6	Jahid Hasan Imon	1924	Kotlin	2020-08-26 23:27:23

#	User	Length	Language	Date
1	Thomas Feld	222	Python 2	2019-09-05 11:38:29
2	Lars Åström	261	Python 2	2018-11-13 07:56:19
3	Yan Kalchevsky	273	Python 2	2017-01-27 21:09:57
4	Andreas Björklund	273	Python 2	2019-06-24 16:40:26
5	Sergey Pashkovsky	275	Python 2	2017-11-27 14:25:26
6	Fromsa Hera	281	Python 2	2018-09-26 16:05:52
7	Matt Bonsall	284	Python 2	2016-10-06 15:04:34
8	Ragur Krishnan	288	Python 2	2019-09-22 22:56:23
9	Riko Jacob	291	Python 2	2019-03-04 10:29:41
10	Hidden user	294	Python 2	2016-12-09 18:02:47

#	User	Length	Language	Date
1	Avery	163	Python 3	2025-08-04 06:29:27
2	Charles Ancheta	173	Python 3	2023-04-15 02:30:02
3	Ahmed Chamseddine	197	Python 3	2025-01-23 07:23:20
4	Farzam Abrishami	223	Python 3	2023-12-31 01:53:07
5	Lim Yong Sheng	227	Python 3	2023-11-14 10:42:53
6	Ashay Sarda	228	Python 3	2022-09-11 19:22:31
7	Thibault Raffaillac	229	Python 3	2020-02-27 17:11:25
8	Noah Hessen Bjerke	235	Python 3	2025-11-04 16:09:56
9	Yonathan Assefa	238	Python 3	2020-12-25 06:27:18
10	Yong Mao	241	Python 3	2023-05-13 22:58:09

#	User	Length	Language	Date
1	Thomas Feld	124	Ruby	2023-05-04 11:23:44
2	Andreas Severin Hauch Trøstrup	197	Ruby	2023-02-03 00:12:41
3	Frederik Petersen	215	Ruby	2023-02-02 13:24:46
4	Hidden user	370	Ruby	2019-03-29 14:52:04
5	Kieran Maharaj	552	Ruby	2020-07-04 09:00:02

#	User	Length	Language	Date
1	Malte Kildelund Rosenkilde	868	Rust	2025-02-04 08:27:48
2	Bas Dirks	1014	Rust	2022-01-17 16:50:13
3	Ishtiaq Hussain Naqi	1078	Rust	2024-10-08 06:45:45
4	Freek van Keulen	1234	Rust	2022-12-01 07:31:15
5	David Rasch	1247	Rust	2020-11-13 11:39:44
6	Andreas Just Petersen	1303	Rust	2023-01-31 13:39:17
7	Malthe Mathias Mølgaard Larsen	1312	Rust	2023-01-31 15:57:33
8	Eric Pinter	1348	Rust	2020-08-04 16:17:54
9	Albert Ross Johannessen	1363	Rust	2024-02-03 13:34:40
10	Zack Groff	1372	Rust	2019-08-07 12:51:07

Solution running time distribution