Problem A
Erase Securely — Problem Statistics

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Submissions	10564
Accepted submissions	5079
Submission ratio	48.08%
Authors	4609
Full solves [?]	4311
Full solve Ratio	93.53%

#	User	Runtime	Language	Date
1	Max NC	0.02 s	APL	2023-09-12 21:50:11
2	Thomas Feld	0.02 s	APL	2023-09-13 12:34:42

#	User	Runtime	Language	Date
1	Bas te Kolste	0.01 s	C#	2013-10-05 13:00:12
2	Reiben	0.01 s	C#	2013-10-15 00:15:51
3	James Kelly	0.01 s	C#	2013-10-17 23:39:20
4	Oscar Lindvall	0.01 s	C#	2014-03-19 08:26:12
5	Ilia Denotkine	0.01 s	C#	2014-04-22 23:17:47
6	Roderick Gregory	0.01 s	C#	2014-10-01 03:31:28
7	r0x3r	0.01 s	C#	2014-10-01 23:07:36
8	Sampath Vuyyuru	0.01 s	C#	2014-10-03 01:50:14
9	Emil Lund Kongsgaard	0.01 s	C#	2014-10-03 17:01:19
10	Jimmy Mårdell	0.01 s	C#	2014-10-03 22:20:12

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.03 s	F#	2022-08-26 18:12:26
2	Hjalte Sorgenfrei Mac Dalland	0.04 s	F#	2020-03-06 15:12:54
3	Mads Jespersen	0.04 s	F#	2020-03-06 16:17:10

#	User	Runtime	Language	Date
1	Jimmy Nejtron	0.00 s	Go	2023-09-20 20:57:30
2	Albert Leung	0.00 s	Go	2024-08-15 03:23:42
3	Đinh Văn Luận	0.02 s	Go	2022-12-08 11:22:02
4	Krzysztof Gibuła	0.07 s	Go	2019-03-14 20:36:32
5	Oskar Johanson	0.07 s	Go	2019-10-12 09:57:38
6	Olof Gren	0.08 s	Go	2019-11-19 18:37:01
7	Norbert Voelker	0.08 s	Go	2021-04-20 00:06:40
8	Jack Kryger Sørensen	0.08 s	Go	2022-01-21 11:09:25
9	Tobias Pulls	0.09 s	Go	2014-09-29 23:32:04
10	Kellen Watt	0.09 s	Go	2015-09-30 03:36:18

#	User	Runtime	Language	Date
1	Amy Colpitts	0.04 s	Java	2024-08-13 22:12:10
2	Sagnik Biswas	0.04 s	Java	2024-09-08 11:43:21
3	Hidden user	0.04 s	Java	2024-12-08 13:16:29
4	Guangyi Zhou	0.04 s	Java	2025-02-05 04:47:27
5	Fatima Mahmood	0.04 s	Java	2025-03-18 13:35:01
6	Tal Belkind	0.04 s	Java	2025-03-28 15:34:47
7	Santiago Gutierrez Alzate	0.05 s	Java	2013-10-07 23:05:06
8	Igor Koval	0.05 s	Java	2013-10-15 21:02:57
9	Martin Vonheim Larsen	0.05 s	Java	2014-06-13 11:33:54
10	Hidden user	0.05 s	Java	2014-06-28 08:56:56

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	JavaScript (Node.js)	2024-08-04 04:53:33
2	Casey Oyugi	0.04 s	JavaScript (Node.js)	2025-05-27 23:27:14
3	Sander Hellesø	0.05 s	JavaScript (Node.js)	2019-04-13 09:03:37
4	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-06-08 17:18:15
5	Aleksi Hannula	0.05 s	JavaScript (Node.js)	2023-12-05 10:54:14
6	Roland VH	0.40 s	JavaScript (Node.js)	2019-09-25 18:53:06
7	Chris Wong	0.41 s	JavaScript (Node.js)	2021-02-23 12:12:14
8	Alexander Oliver	0.42 s	JavaScript (Node.js)	2020-03-06 15:25:54
9	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-03-04 21:17:25
10	Ilya Ryazanov	0.42 s	JavaScript (Node.js)	2021-05-15 15:58:52

#	User	Runtime	Language	Date
1	Anton Klarén	0.01 s	JavaScript (SpiderMonkey)	2014-09-04 09:06:10
2	Erik Nygren	0.01 s	JavaScript (SpiderMonkey)	2014-12-01 19:38:46
3	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-19 18:43:20
4	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-01-23 18:08:13
5	Mark Bouchkevitch	0.01 s	JavaScript (SpiderMonkey)	2016-08-07 14:23:50
6	J M	0.01 s	JavaScript (SpiderMonkey)	2016-11-12 16:41:19
7	Ionel Hindorean	0.01 s	JavaScript (SpiderMonkey)	2016-12-02 19:09:25
8	Paul Leung	0.01 s	JavaScript (SpiderMonkey)	2017-02-16 17:09:14
9	Spencer Smith	0.01 s	JavaScript (SpiderMonkey)	2017-06-09 06:26:02
10	Omar Al-Khashab	0.01 s	JavaScript (SpiderMonkey)	2018-04-25 09:09:11

#	User	Runtime	Language	Date
1	Timothy Gaede	0.55 s	Julia	2024-04-02 06:55:17
2	Danny Robinson	0.56 s	Julia	2023-06-25 16:17:07

#	User	Runtime	Language	Date
1	Dayan Ruben Gonzalez	0.16 s	Kotlin	2020-09-28 16:01:17
2	Dmitry Shostak	0.18 s	Kotlin	2018-08-20 17:11:35
3	Jahid Hasan Imon	0.18 s	Kotlin	2020-05-12 02:09:05
4	Adam Rankin	0.18 s	Kotlin	2023-04-25 19:25:08
5	Thore Husfeldt	0.19 s	Kotlin	2020-11-03 19:12:27
6	Emil Wihlander	0.19 s	Kotlin	2023-07-26 22:14:25
7	Hidden user	0.20 s	Kotlin	2019-11-17 06:12:25
8	Neil Harmon	0.21 s	Kotlin	2019-04-29 16:12:56
9	Troy Warmboe	0.21 s	Kotlin	2020-02-06 00:41:49
10	Phường Lên	0.21 s	Kotlin	2020-04-14 20:15:19

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.00 s	OCaml	2022-11-26 05:06:28

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2017-08-08 23:31:14
2	David Connolly	0.00 s	Pascal	2022-04-12 16:03:02

#	User	Runtime	Language	Date
1	Silvena Lam	0.01 s	PHP	2016-02-11 17:42:21
2	Leonard Kalema	0.01 s	PHP	2018-05-18 20:52:01
3	Renate	0.01 s	PHP	2021-11-17 01:16:50
4	Andre Wahyudi	0.01 s	PHP	2023-03-13 09:28:42
5	nazifa	0.01 s	PHP	2025-04-11 03:17:04

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.01 s	Prolog	2016-01-24 09:52:49
2	Hadi Qovaizi	0.02 s	Prolog	2016-04-22 03:21:31
3	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-09 07:03:48

#	User	Runtime	Language	Date
1	Jacob Wejendorp	0.02 s	Python 2	2013-10-06 23:56:09
2	Ehsan Kia	0.02 s	Python 2	2013-10-13 21:43:41
3	Elias Riedel Gårding	0.02 s	Python 2	2014-03-19 09:34:21
4	Torfinn Tyvold Skarvatun	0.02 s	Python 2	2014-09-29 20:41:46
5	Samantha Wojtowicz	0.02 s	Python 2	2014-10-01 00:08:42
6	Linus Ländin	0.02 s	Python 2	2014-10-01 11:58:00
7	Todd Perry	0.02 s	Python 2	2014-10-01 15:45:13
8	Alex Bright	0.02 s	Python 2	2014-10-05 19:27:55
9	Håkon Vågsether	0.02 s	Python 2	2014-10-14 18:36:42
10	Martin Stensgård	0.02 s	Python 2	2014-11-25 19:36:53

#	User	Runtime	Language	Date
1	Changyu Bi	0.02 s	Python 3	2014-09-13 03:50:51
2	Brian Harrington	0.02 s	Python 3	2014-09-13 19:07:51
3	Kalindu De Costa	0.02 s	Python 3	2014-09-18 03:53:40
4	Jerry Cheng	0.02 s	Python 3	2014-09-26 22:43:46
5	Arvin Johansson Arbab	0.02 s	Python 3	2014-09-29 21:34:10
6	Hidden user	0.02 s	Python 3	2014-09-30 10:11:57
7	Fredrik Østrem	0.02 s	Python 3	2014-09-30 17:18:14
8	Hlynur “Glitch” Óskar Guðmundsson	0.02 s	Python 3	2014-09-30 21:28:58
9	Erik Månsson	0.02 s	Python 3	2014-10-01 13:51:22
10	Norman Duncan	0.02 s	Python 3	2014-10-17 11:42:42

#	User	Runtime	Language	Date
1	Gerry Hall	0.03 s	Ruby	2016-03-27 05:16:15
2	Lasse Berglund	0.03 s	Ruby	2016-04-01 07:15:15
3	Kellen Watt	0.03 s	Ruby	2016-07-06 04:22:06
4	Erik Rydbert	0.03 s	Ruby	2016-07-07 12:26:00
5	Hidden user	0.03 s	Ruby	2016-08-14 08:20:52
6	Reinalyn Conde	0.03 s	Ruby	2017-06-08 09:02:52
7	Hidden user	0.04 s	Ruby	2018-10-10 21:07:17
8	Savvas Alexandrou	0.04 s	Ruby	2018-12-15 19:38:48
9	Dalton Parker Caron	0.04 s	Ruby	2019-01-04 02:15:17
10	Hidden user	0.04 s	Ruby	2019-03-04 12:46:24

#	User	Runtime	Language	Date
1	David Granger	0.00 s	Swift	2023-10-06 03:22:48

#	User	Length	Language	Date
1	Thomas Feld	61	APL	2023-09-13 12:43:59
2	Max NC	78	APL	2023-09-12 21:50:11

#	User	Length	Language	Date
1	Martin Blom	161	C	2024-01-29 22:31:50
2	Anton Haglund	370	C	2016-12-05 17:39:56
3	Sebastian Oveland	401	C	2019-12-10 13:55:09
4	Hidden user	403	C	2018-11-01 16:13:10
5	Hidden user	422	C	2016-03-08 12:43:26
6	Raviteja Danakonda	430	C	2018-05-04 11:55:21
7	Viet Anh Ho	434	C	2016-05-07 23:41:00
8	Hidden user	435	C	2021-11-08 05:19:43
9	Ivan Petrov	438	C	2019-07-09 09:33:59
10	Hidden user	442	C	2017-12-28 17:08:43

#	User	Length	Language	Date
1	Jimmy Mårdell	351	C#	2014-10-03 22:20:12
2	Anthony Ye	396	C#	2023-04-30 18:07:05
3	Esty Crow	405	C#	2023-04-27 05:01:31
4	Göran Andersson	560	C#	2022-05-15 16:32:52
5	Саттар Имамов	568	C#	2017-11-05 14:11:34
6	Hidden user	582	C#	2022-11-25 23:43:56
7	r0x3r	594	C#	2014-10-01 23:07:36
8	John Matanda	606	C#	2022-02-12 13:19:43
9	Rasmus Brants	612	C#	2017-03-27 10:14:54
10	kaxi	614	C#	2024-11-25 12:24:22

#	User	Length	Language	Date
1	Mikko Sysikaski	211	C++	2013-10-05 11:45:01
2	Hidden user	230	C++	2020-03-27 23:49:16
3	Antonio Molina Lovett	232	C++	2016-08-06 05:52:29
4	Elias Lolck	237	C++	2022-10-02 12:58:23
5	Jan Livens	257	C++	2017-03-23 16:51:38
6	Wei Liang Tan	265	C++	2019-05-23 10:42:05
7	張均聖	266	C++	2019-07-13 05:09:21
8	黃柏豪	268	C++	2019-04-19 15:42:30
9	Albin Kjellson	269	C++	2023-08-28 23:18:44
10	Đậu Huy Minh	270	C++	2022-10-27 15:26:15

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	443	F#	2022-08-26 18:12:26
2	Mads Jespersen	620	F#	2020-03-06 16:17:10
3	Hjalte Sorgenfrei Mac Dalland	705	F#	2020-03-06 15:12:54

#	User	Length	Language	Date
1	Kellen Watt	448	Go	2015-09-30 03:36:18
2	Jack Kryger Sørensen	457	Go	2022-01-21 11:09:25
3	Jimmy Nejtron	531	Go	2023-09-20 20:57:30
4	Oskar Johanson	533	Go	2019-10-12 09:57:38
5	Olof Gren	602	Go	2019-11-19 18:37:01
6	Krzysztof Gibuła	615	Go	2019-03-14 20:36:32
7	Tobias Pulls	621	Go	2014-09-29 23:32:04
8	Đinh Văn Luận	703	Go	2022-12-08 11:22:02
9	Norbert Voelker	1062	Go	2021-04-20 00:06:40
10	Albert Leung	1348	Go	2024-08-15 03:23:42

#	User	Length	Language	Date
1	Brandon Tang	229	Haskell	2023-05-21 21:12:30
2	Sebastian Banert	230	Haskell	2023-09-08 09:11:10
3	Llaurence Git	246	Haskell	2018-11-07 13:37:10
4	Anthony Clark	261	Haskell	2017-03-05 20:10:00
5	Anthony Clays	285	Haskell	2017-01-23 14:57:42
6	Øyvind Almli	294	Haskell	2021-10-30 15:01:06
7	Steinar Simonnes	300	Haskell	2023-09-30 23:29:28
8	Håkon Flatval	309	Haskell	2018-08-20 16:58:33
9	Blake Hyde	310	Haskell	2015-11-15 04:52:42
10	Lars Tveito	311	Haskell	2015-07-02 08:52:58

#	User	Length	Language	Date
1	Jason Liu	350	Java	2023-05-13 21:24:08
2	Melanie Kirsche	415	Java	2014-09-30 22:44:20
3	Einar Þór Ívarsson	437	Java	2020-02-27 16:39:43
4	Frank Ruskey	451	Java	2018-10-06 21:09:32
5	Kyle Sferrazza	455	Java	2018-09-29 01:21:58
6	Ali Pervaiz	455	Java	2019-03-20 01:05:02
7	Raymond Arrington	455	Java	2024-06-17 17:17:25
8	Jordan Lamkin	473	Java	2017-02-03 23:19:06
9	Markus Olsson	477	Java	2014-10-02 13:23:10
10	Doug Goodman	481	Java	2017-11-07 19:45:44

#	User	Length	Language	Date
1	Roland VH	620	JavaScript (Node.js)	2019-09-25 18:53:06
2	Howard Tin Chi Chan	645	JavaScript (Node.js)	2021-03-04 21:17:25
3	Spencer Davis	709	JavaScript (Node.js)	2021-10-09 07:06:57
4	Sander Hellesø	715	JavaScript (Node.js)	2019-04-13 09:03:37
5	Chris Wong	770	JavaScript (Node.js)	2021-02-23 12:12:14
6	Hidden user	783	JavaScript (Node.js)	2023-08-31 06:43:37
7	Gurpartap Singh Bhatti	799	JavaScript (Node.js)	2019-06-08 17:33:55
8	Niamh Limerick	843	JavaScript (Node.js)	2022-02-20 12:14:54
9	Casey Oyugi	861	JavaScript (Node.js)	2025-05-27 23:27:14
10	Alexander Oliver	878	JavaScript (Node.js)	2020-03-06 15:25:54

#	User	Length	Language	Date
1	Christian Cederquist	146	JavaScript (SpiderMonkey)	2023-01-01 13:05:15
2	Jimmy Gustafsson	184	JavaScript (SpiderMonkey)	2024-07-13 00:20:54
3	Erik Nygren	213	JavaScript (SpiderMonkey)	2014-12-01 19:38:46
4	Peter Menyes	237	JavaScript (SpiderMonkey)	2021-08-18 18:35:23
5	Zach Tschetter	242	JavaScript (SpiderMonkey)	2023-04-18 03:18:42
6	Bjørn Chr. Soltvedt	245	JavaScript (SpiderMonkey)	2016-01-23 18:17:22
7	Peter Kedemo	246	JavaScript (SpiderMonkey)	2015-12-19 18:43:20
8	Evan Magill	269	JavaScript (SpiderMonkey)	2024-09-15 19:43:13
9	Davíð Helgason	283	JavaScript (SpiderMonkey)	2019-06-25 16:48:03
10	J M	350	JavaScript (SpiderMonkey)	2016-11-12 16:41:19

#	User	Length	Language	Date
1	Danny Robinson	120	Julia	2023-06-25 16:17:07
2	Timothy Gaede	294	Julia	2024-04-02 06:55:17

#	User	Length	Language	Date
1	Thore Husfeldt	318	Kotlin	2020-11-03 19:12:27
2	Lewis Johnson	354	Kotlin	2023-09-05 00:01:13
3	Troy Warmboe	357	Kotlin	2020-02-06 00:41:49
4	Emil Wihlander	371	Kotlin	2023-07-26 22:14:25
5	Dmitry Shostak	372	Kotlin	2018-08-20 17:11:35
6	Dayan Ruben Gonzalez	374	Kotlin	2020-09-28 16:01:17
7	Chris Johnson	386	Kotlin	2023-09-05 04:28:39
8	Phường Lên	391	Kotlin	2020-04-14 20:15:19
9	Einar Kjellback	497	Kotlin	2019-12-12 12:58:48
10	Hidden user	548	Kotlin	2019-11-17 06:12:25

#	User	Length	Language	Date
1	Jinwoo Lee	375	OCaml	2022-11-26 05:06:28

#	User	Length	Language	Date
1	Ingemar Ragnemalm	516	Pascal	2017-08-08 23:31:14
2	David Connolly	528	Pascal	2022-04-12 16:03:02

#	User	Length	Language	Date
1	Renate	437	PHP	2021-11-17 01:16:50
2	Leonard Kalema	535	PHP	2018-05-18 20:52:01
3	nazifa	544	PHP	2025-04-11 03:17:04
4	Andre Wahyudi	771	PHP	2023-03-13 09:28:42
5	Silvena Lam	774	PHP	2016-02-11 17:44:48

#	User	Length	Language	Date
1	Hakan Kjellerstrand	496	Prolog	2023-02-09 07:03:48
2	Andriy Zyevakov	1328	Prolog	2016-01-24 09:52:49
3	Hadi Qovaizi	8782	Prolog	2016-04-22 03:21:31

#	User	Length	Language	Date
1	Thomas Feld	137	Python 2	2019-08-19 14:56:55
2	Erik Odenman	201	Python 2	2015-05-10 21:08:43
3	aiR	208	Python 2	2019-03-31 01:31:22
4	Martin Stensgård	209	Python 2	2014-11-25 19:36:53
5	Jesper Öqvist	213	Python 2	2018-10-20 18:16:20
6	Andreas Björklund	217	Python 2	2020-03-09 21:01:57
7	Shaheer Ahmed	218	Python 2	2017-12-09 01:16:06
8	Miguel Alfageme Sanchez	225	Python 2	2017-02-10 07:09:34
9	Hidden user	233	Python 2	2017-12-01 00:13:28
10	Zara Lim	235	Python 2	2018-09-24 09:31:08

#	User	Length	Language	Date
1	Gustav Elmqvist	94	Python 3	2023-02-12 22:34:35
2	Odin Dahlström	98	Python 3	2022-09-19 20:11:47
3	Clement Oh	99	Python 3	2023-06-20 20:27:36
4	Philip Svensson	100	Python 3	2022-09-23 22:10:15
5	Alex Loiko	108	Python 3	2015-06-27 21:16:04
6	Rachel Krohn	112	Python 3	2025-03-28 23:03:28
7	Joey Pabalan	125	Python 3	2025-05-25 01:49:34
8	Thomas Draper	129	Python 3	2023-02-28 17:26:24
9	Tai Tze Kin	131	Python 3	2024-05-02 18:54:21
10	5teff	134	Python 3	2022-09-09 20:23:13

#	User	Length	Language	Date
1	Thomas Feld	79	Ruby	2023-01-30 14:28:22
2	Clement Oh	112	Ruby	2023-10-14 09:45:27
3	Hidden user	189	Ruby	2018-10-10 21:07:17
4	Eugen Neagoe	216	Ruby	2023-06-30 16:56:43
5	Hidden user	252	Ruby	2019-03-04 12:46:24
6	Kellen Watt	262	Ruby	2016-07-06 04:22:06
7	Dalton Parker Caron	295	Ruby	2019-01-04 02:15:17
8	Gerry Hall	305	Ruby	2016-03-27 05:16:15
9	Erik Rydbert	370	Ruby	2016-07-07 12:26:00
10	Reinalyn Conde	372	Ruby	2017-06-08 09:02:52

#	User	Length	Language	Date
1	Vincent Lagerros	269	Rust	2024-09-30 01:00:23
2	Taylor South	447	Rust	2023-12-05 23:20:43
3	Bas Dirks	554	Rust	2022-01-03 20:56:44
4	Adrien Coulier	568	Rust	2019-12-21 15:47:53
5	Einar Persson	581	Rust	2023-08-28 17:37:53
6	Louis Bouchard	651	Rust	2024-09-08 05:01:39
7	Arturas Aleksandraus	664	Rust	2024-01-24 09:51:12
8	Alexander Holmberg	684	Rust	2021-09-17 20:27:40
9	Kok Dith	699	Rust	2021-08-13 09:54:41
10	Constantin Buruiana	703	Rust	2024-09-08 00:27:51

#	User	Length	Language	Date
1	David Granger	613	Swift	2023-10-06 03:22:48

Solution running time distribution