Problem A
Friday the 13th — Problem Statistics

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Submissions	4745
Accepted submissions	2296
Submission ratio	48.39%
Authors	2206
Full solves [?]	2021
Full solve Ratio	91.61%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.08 s	Bash	2024-04-16 16:07:35

#	User	Runtime	Language	Date
1	Bas te Kolste	0.02 s	C#	2015-06-17 12:49:12
2	Mads Storm Hansen	0.02 s	C#	2015-07-17 16:26:52
3	Jens Mossig	0.02 s	C#	2015-08-18 11:47:52
4	Jay Hal	0.02 s	C#	2015-09-18 22:18:32
5	Niklas Huss	0.02 s	C#	2015-09-19 09:30:27
6	Daniel Jansson	0.02 s	C#	2016-02-26 14:33:56
7	Andreas Jansson	0.02 s	C#	2016-02-29 17:13:09
8	Khin Nyunt	0.02 s	C#	2016-04-30 15:21:45
9	Raja Sanjeev Kumar Nakka	0.02 s	C#	2016-06-01 18:56:29
10	Pontus Magnusson	0.02 s	C#	2016-06-08 17:39:23

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.04 s	F#	2022-11-06 18:59:21

#	User	Runtime	Language	Date
1	Neal McCarthy	0.01 s	Go	2018-10-27 20:39:10
2	Krzysztof Gibuła	0.02 s	Go	2019-01-14 16:26:46
3	Jonas S	0.08 s	Go	2017-01-10 22:14:08
4	Norbert Voelker	0.08 s	Go	2021-04-23 19:17:31
5	Kristoffer Åhgren	0.09 s	Go	2017-04-20 12:45:46

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Haskell	2015-09-24 13:49:30
2	Peter Deal	0.00 s	Haskell	2016-05-14 18:32:50
3	Antony Lee	0.00 s	Haskell	2017-10-14 20:29:55
4	Erik Tjøswold	0.00 s	Haskell	2018-04-07 17:42:55
5	Caleb Surovik	0.00 s	Haskell	2021-07-14 06:39:29
6	Li Jun	0.00 s	Haskell	2023-06-29 12:41:34
7	Steinar Simonnes	0.00 s	Haskell	2024-03-27 12:35:58
8	Johan Meier	0.01 s	Haskell	2016-12-28 03:29:39
9	Matthew Johnson	0.01 s	Haskell	2017-01-05 08:51:17
10	Brent Yorgey	0.01 s	Haskell	2017-10-13 06:07:47

#	User	Runtime	Language	Date
1	Jan Štola	0.05 s	Java	2015-04-27 16:58:08
2	William Brigham	0.05 s	Java	2017-04-19 02:02:26
3	John Isak Fjellvang Villanger	0.05 s	Java	2018-09-12 18:21:20
4	José Vander Meulen	0.05 s	Java	2018-11-24 15:37:15
5	Johan Jensen	0.06 s	Java	2015-04-25 12:41:24
6	Per Odlo	0.06 s	Java	2015-04-25 12:42:08
7	Marte Dybevik Løge	0.06 s	Java	2015-04-25 12:55:27
8	Åsmund Vikane	0.06 s	Java	2015-04-25 14:31:10
9	Magnar Myrtveit	0.06 s	Java	2015-04-29 20:22:09
10	Nathaniel Lahn	0.06 s	Java	2015-08-10 04:19:24

#	User	Runtime	Language	Date
1	Paul Molina Plant	0.05 s	JavaScript (Node.js)	2018-08-19 04:31:05
2	Thomas Kobak	0.05 s	JavaScript (Node.js)	2019-02-16 00:56:48
3	Gurpartap Singh Bhatti	0.06 s	JavaScript (Node.js)	2019-04-27 23:31:05
4	Chris Wong	0.41 s	JavaScript (Node.js)	2021-02-21 15:15:48
5	Daniel Cabral	0.42 s	JavaScript (Node.js)	2020-03-31 17:17:05
6	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-20 15:08:04
7	Jonas Pedersen	0.42 s	JavaScript (Node.js)	2020-12-11 17:36:17
8	Khin Nyunt	0.42 s	JavaScript (Node.js)	2021-10-03 14:06:30
9	Niamh Limerick	0.42 s	JavaScript (Node.js)	2022-02-24 19:45:38

#	User	Runtime	Language	Date
1	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-19 22:50:58
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-02-01 14:51:31
3	Johannes Jensen	0.01 s	JavaScript (SpiderMonkey)	2016-03-31 20:33:55
4	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-08-02 23:44:10
5	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-08-28 21:35:48
6	Christian Pilegaard Cederquist	0.03 s	JavaScript (SpiderMonkey)	2023-01-23 02:38:46
7	Zach Tschetter	0.03 s	JavaScript (SpiderMonkey)	2023-06-24 06:29:36

#	User	Runtime	Language	Date
1	Timothy Gaede	0.52 s	Julia	2024-05-10 10:33:22

#	User	Runtime	Language	Date
1	Johnny Baloney	0.14 s	Kotlin	2021-12-05 20:37:27
2	Dayan Ruben Gonzalez	0.18 s	Kotlin	2020-09-29 21:54:33
3	Ravisai Tiruvuri	0.18 s	Kotlin	2024-03-26 06:41:03
4	Adam Rankin	0.19 s	Kotlin	2023-05-10 23:16:05
5	Antony Lee	0.21 s	Kotlin	2017-10-14 20:10:37
6	Kim Stephen Bovim	0.21 s	Kotlin	2021-02-18 15:17:05
7	Even Rognlien	0.21 s	Kotlin	2022-02-22 22:20:24
8	Troy Warmboe	0.22 s	Kotlin	2018-10-20 00:23:34
9	Einar Kjellback	0.22 s	Kotlin	2020-08-17 10:09:10
10	James WIlliams	0.22 s	Kotlin	2020-10-19 04:56:00

#	User	Runtime	Language	Date
1	Silvena Lam	0.01 s	PHP	2016-02-11 17:25:34
2	Susanne Ragnemalm	0.01 s	PHP	2018-11-09 00:55:27

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.01 s	Prolog	2018-11-23 22:01:22
2	Hakan Kjellerstrand	0.02 s	Prolog	2023-03-09 17:44:02

#	User	Runtime	Language	Date
1	Martin Vonheim Larsen	0.03 s	Python 2	2015-04-25 11:33:03
2	Jean Niklas L'orange	0.03 s	Python 2	2015-04-25 11:41:50
3	Stian Jensen	0.03 s	Python 2	2015-04-25 12:16:34
4	Edgar Vedvik	0.03 s	Python 2	2015-04-25 12:16:45
5	Halvor Lund	0.03 s	Python 2	2015-04-25 12:21:51
6	Arne Tobias Malkenes Ødegaard	0.03 s	Python 2	2015-04-25 12:22:12
7	Ida Bredal Skjørten	0.03 s	Python 2	2015-04-25 12:43:54
8	Didrik Pemmer Aalen	0.03 s	Python 2	2015-04-25 12:52:59
9	Vemund Santi	0.03 s	Python 2	2015-04-25 13:02:25
10	Vegard Stikbakke	0.03 s	Python 2	2015-04-25 13:21:41

#	User	Runtime	Language	Date
1	Nils Gustafsson	0.02 s	Python 3	2015-04-25 14:22:26
2	James Elías Sigurðarson	0.02 s	Python 3	2015-05-30 22:40:03
3	Fredrik Carlsen	0.02 s	Python 3	2015-06-07 10:40:32
4	Johannes Agestam	0.02 s	Python 3	2015-06-14 20:36:18
5	Tristan van Leeuwen	0.02 s	Python 3	2015-06-17 15:35:38
6	Martin Stensgård	0.02 s	Python 3	2015-07-25 04:00:03
7	John Harrison	0.02 s	Python 3	2015-09-17 22:41:22
8	田中恭太	0.02 s	Python 3	2015-10-14 02:48:29
9	Emil Riis Hansen	0.02 s	Python 3	2015-10-17 19:20:55
10	Wayne	0.02 s	Python 3	2016-01-26 22:23:14

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-03-12 20:40:28
2	Lasse Berglund	0.03 s	Ruby	2016-05-01 11:59:50
3	Alghi Fariansyah	0.05 s	Ruby	2020-10-30 04:15:03
4	Hidden user	0.05 s	Ruby	2021-01-13 23:37:00
5	Kok Dith	0.05 s	Ruby	2021-08-19 04:38:47
6	Thomas Feld	0.06 s	Ruby	2023-05-04 12:50:24
7	Frans Meulenbroeks	0.06 s	Ruby	2024-10-06 18:26:15

#	User	Runtime	Language	Date
1	John Paul Hanson	0.00 s	Rust	2020-01-16 22:51:18
2	Arnav Sastry	0.00 s	Rust	2021-08-16 23:25:40
3	Bas Dirks	0.00 s	Rust	2022-01-26 09:32:50
4	Isak Jägberg	0.00 s	Rust	2024-11-04 16:40:41
5	Egor Kulikov	0.00 s	Rust	2025-02-06 12:55:03
6	Vincent Lagerros	0.00 s	Rust	2025-09-19 14:08:40
7	Joe Blower	0.00 s	Rust	2025-11-16 23:33:06

#	User	Length	Language	Date
1	Chenzhang Hu	1472	Bash	2024-04-16 16:07:35

#	User	Length	Language	Date
1	Sambit Palit	388	C	2020-10-21 05:04:55
2	Hidden user	392	C	2017-04-18 00:29:44
3	Velvet	398	C	2020-12-11 16:27:17
4	Filly osopher	423	C	2017-03-09 21:50:58
5	Julian Duniec	425	C	2023-08-17 14:55:24
6	Matthew Weston	429	C	2022-03-09 18:01:29
7	Mikael K Eriksson	446	C	2021-01-24 17:56:04
8	Kyawt San	447	C	2022-10-13 11:26:27
9	Anton Haglund	448	C	2016-12-05 16:58:30
10	Olle Eriksson	463	C	2016-11-28 01:23:36

#	User	Length	Language	Date
1	Michael Damsgaard	424	C#	2025-01-02 06:06:52
2	Robert Low	548	C#	2016-07-16 23:38:38
3	Thomas Norris	759	C#	2019-10-22 20:22:53
4	Göran Andersson	793	C#	2022-05-15 14:10:50
5	Khin Nyunt	831	C#	2016-04-30 15:21:45
6	Pontus Magnusson	911	C#	2016-06-08 18:03:42
7	Anders Parsberg Wagner	921	C#	2020-10-30 16:50:08
8	Bas te Kolste	1021	C#	2015-06-17 12:49:12
9	Hidden user	1022	C#	2017-04-20 18:21:21
10	Marius Løkketangen	1026	C#	2021-02-18 15:05:27

#	User	Length	Language	Date
1	Frans Meulenbroeks	173	C++	2024-10-06 17:39:53
2	Antonio Molina Lovett	256	C++	2016-08-06 06:02:56
3	Johan Wind	260	C++	2015-05-15 17:24:13
4	Ganapathy Sanath Balaji	275	C++	2019-08-09 02:59:14
5	Giang Đào	277	C++	2018-10-16 07:02:12
6	Emma Nimstad	280	C++	2015-06-28 15:11:49
7	Markus Mathiasen	289	C++	2021-08-05 13:16:33
8	William Gan	290	C++	2017-08-13 04:01:34
9	Cutes Mouse	297	C++	2023-08-14 08:03:18
10	Ⲡⲟⲓⲙⲏⲛ	298	C++	2022-07-14 12:05:34

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1207	F#	2022-11-06 18:59:21

#	User	Length	Language	Date
1	Krzysztof Gibuła	611	Go	2019-01-14 16:26:46
2	Norbert Voelker	658	Go	2021-04-23 19:17:31
3	Jonas S	982	Go	2017-01-10 22:14:08
4	Neal McCarthy	1150	Go	2018-10-27 20:39:10
5	Kristoffer Åhgren	1308	Go	2017-04-20 12:45:46

#	User	Length	Language	Date
1	Li Jun	281	Haskell	2023-06-29 12:40:08
2	Peter Deal	382	Haskell	2016-05-14 18:32:50
3	Hidden user	446	Haskell	2019-08-25 16:51:31
4	Antony Lee	472	Haskell	2017-10-14 20:45:53
5	Jørn Lode	482	Haskell	2021-10-11 17:59:07
6	Johan Meier	503	Haskell	2016-12-28 03:29:39
7	Matthew Johnson	523	Haskell	2017-01-05 08:51:17
8	Brent Yorgey	562	Haskell	2017-10-13 06:07:47
9	Hidden user	649	Haskell	2023-01-02 18:23:35
10	Steinar Simonnes	673	Haskell	2024-03-27 12:35:58

#	User	Length	Language	Date
1	Doug Goodman	437	Java	2017-12-02 19:34:18
2	Rodi Hasan	460	Java	2015-06-27 18:03:20
3	Jordan Lamkin	460	Java	2017-01-27 23:54:06
4	Sam Huynh	466	Java	2021-08-12 13:07:15
5	Prakash Sanyasi	480	Java	2017-04-06 09:54:22
6	Erlend Raa Vågset	487	Java	2018-09-12 16:50:56
7	Ei Mon Theint	488	Java	2016-05-25 08:38:29
8	Evan Losier	491	Java	2019-10-31 03:36:53
9	Geson Chong	493	Java	2017-04-08 01:35:05
10	Simon Xue	494	Java	2015-11-10 07:50:48

#	User	Length	Language	Date
1	Khin Nyunt	806	JavaScript (Node.js)	2021-10-03 14:06:30
2	Chris Wong	881	JavaScript (Node.js)	2021-02-21 15:15:48
3	Paul Molina Plant	885	JavaScript (Node.js)	2018-08-19 04:31:05
4	Thomas Kobak	904	JavaScript (Node.js)	2019-02-16 00:56:48
5	Daniel Cabral	1002	JavaScript (Node.js)	2020-03-31 17:20:07
6	Niamh Limerick	1221	JavaScript (Node.js)	2022-02-24 19:45:38
7	Gurpartap Singh Bhatti	1402	JavaScript (Node.js)	2019-04-27 23:31:05
8	Andoko Chandra	1462	JavaScript (Node.js)	2020-10-20 15:08:04
9	Jonas Pedersen	3166	JavaScript (Node.js)	2020-12-11 17:36:17

#	User	Length	Language	Date
1	Jimmy Gustafsson	105	JavaScript (SpiderMonkey)	2024-08-02 23:44:10
2	Bjørn Chr. Soltvedt	304	JavaScript (SpiderMonkey)	2016-02-01 14:51:31
3	Peter Menyes	402	JavaScript (SpiderMonkey)	2021-08-28 21:35:48
4	Christian Pilegaard Cederquist	456	JavaScript (SpiderMonkey)	2023-01-23 02:38:46
5	Johannes Jensen	559	JavaScript (SpiderMonkey)	2016-03-31 20:33:55
6	Peter Kedemo	576	JavaScript (SpiderMonkey)	2015-12-19 22:50:58
7	Zach Tschetter	598	JavaScript (SpiderMonkey)	2023-06-24 06:29:36

#	User	Length	Language	Date
1	Timothy Gaede	851	Julia	2024-05-10 10:33:22

#	User	Length	Language	Date
1	Antony Lee	424	Kotlin	2017-10-14 20:10:37
2	Jonathan Soo	463	Kotlin	2019-06-21 11:32:49
3	Dayan Ruben Gonzalez	499	Kotlin	2020-09-29 21:54:33
4	Einar Kjellback	587	Kotlin	2020-08-17 10:09:10
5	Vegard Veiset	635	Kotlin	2022-02-22 15:50:36
6	Eric Huynh	681	Kotlin	2019-02-01 04:57:15
7	Kim Stephen Bovim	686	Kotlin	2021-02-18 15:17:05
8	Adam Rankin	722	Kotlin	2023-05-10 23:16:05
9	Even Rognlien	744	Kotlin	2022-02-22 22:20:24
10	Torbjørn Tessem	775	Kotlin	2022-02-22 16:37:35

#	User	Length	Language	Date
1	Susanne Ragnemalm	784	PHP	2018-11-09 00:55:27
2	Silvena Lam	810	PHP	2016-02-11 17:25:34

#	User	Length	Language	Date
1	Hakan Kjellerstrand	248	Prolog	2023-03-12 10:40:22
2	Andriy Zyevakov	652	Prolog	2018-11-23 22:01:22

#	User	Length	Language	Date
1	Thomas Feld	172	Python 2	2019-08-27 12:18:24
2	Erik Odenman	217	Python 2	2015-05-10 18:10:01
3	Andreas Björklund	225	Python 2	2019-05-12 10:27:35
4	Neal Zane	237	Python 2	2016-03-08 01:51:27
5	Paul Leung	256	Python 2	2017-10-31 16:00:56
6	Haggai Liu	260	Python 2	2017-01-19 22:52:07
7	Haggai Liu	260	Python 2	2017-01-20 09:01:13
8	Balder Søholt Halmrast	268	Python 2	2015-04-25 12:08:41
9	Jesper Öqvist	279	Python 2	2018-10-24 22:52:27
10	Johan Lyts	283	Python 2	2019-07-20 15:13:53

#	User	Length	Language	Date
1	Michael Goldwasser	117	Python 3	2025-08-28 07:21:34
2	Russell Ng	118	Python 3	2025-07-27 11:08:02
3	Ahmed Chamseddine	128	Python 3	2024-08-06 16:21:48
4	Frans Meulenbroeks	138	Python 3	2024-10-06 17:58:38
5	Harry Zhang	141	Python 3	2024-04-23 23:37:01
6	Thibault Raffaillac	179	Python 3	2020-02-01 23:51:50
7	Hakan Kjellerstrand	179	Python 3	2023-03-12 10:35:16
8	Praveen Roshan R R	188	Python 3	2025-09-14 05:16:07
9	Thanishka R	188	Python 3	2025-09-14 05:24:47
10	Zeheng Li	190	Python 3	2024-05-03 17:58:27

#	User	Length	Language	Date
1	Thomas Feld	65	Ruby	2023-05-04 12:50:24
2	Frans Meulenbroeks	124	Ruby	2024-10-06 18:26:15
3	Hidden user	195	Ruby	2021-01-13 23:37:00
4	Kok Dith	280	Ruby	2021-08-19 04:38:47
5	Alghi Fariansyah	319	Ruby	2020-10-30 04:15:03
6	Casper Christensen	426	Ruby	2016-03-12 20:40:28
7	Lasse Berglund	431	Ruby	2016-05-01 11:59:50

#	User	Length	Language	Date
1	Vincent Lagerros	462	Rust	2025-09-19 14:08:40
2	Bas Dirks	644	Rust	2022-01-26 09:32:50
3	John Paul Hanson	1012	Rust	2020-01-16 22:51:18
4	Isak Jägberg	1261	Rust	2024-11-04 16:40:41
5	Joe Blower	1786	Rust	2025-11-16 23:33:06
6	Arnav Sastry	2664	Rust	2021-08-16 23:25:40
7	Egor Kulikov	16082	Rust	2025-02-06 12:55:03

Solution running time distribution