Problem A
Egypt — Problem Statistics

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Submissions	10662
Accepted submissions	3364
Submission ratio	31.55%
Authors	3280
Full solves [?]	2904
Full solve Ratio	88.54%

#	User	Runtime	Language	Date
1	Perry Weller (student)	0.10 s	APL	2023-10-03 20:16:32

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-10-18 02:47:20
2	Thomas Feld	0.01 s	Bash	2023-10-18 10:27:04

#	User	Runtime	Language	Date
1	Mazen Mohamad	0.02 s	C#	2018-04-09 15:19:40
2	Дмитро Рудий	0.02 s	C#	2018-04-18 13:18:16
3	Philip Classon	0.02 s	C#	2018-12-27 15:46:36
4	Tom Ilestrand	0.02 s	C#	2019-02-28 16:06:50
5	Håvard Stuberg	0.02 s	C#	2019-05-18 12:10:29
6	Leon V	0.02 s	C#	2019-11-08 14:07:53
7	Thomas Norris	0.02 s	C#	2020-01-08 15:29:05
8	Keyvan Sahafi	0.02 s	C#	2022-06-15 16:33:17
9	Eric Weiss	0.02 s	C#	2022-09-12 22:00:48
10	Julio Axel Montero Barrientos	0.02 s	C#	2022-10-11 23:41:11

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.05 s	F#	2022-10-08 14:34:23

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	Go	2018-11-03 01:11:37
2	Michael Johansson	0.06 s	Go	2022-11-22 15:58:29
3	Hidden user	0.06 s	Go	2023-02-12 05:22:19
4	Krzysztof Gibuła	0.08 s	Go	2021-04-15 20:54:57
5	Norbert Voelker	0.08 s	Go	2021-04-22 00:56:13
6	Andriy Zyevakov	0.09 s	Go	2019-04-14 17:17:24
7	Ali M. Ismail	0.12 s	Go	2018-04-22 23:39:32
8	James McDermott	0.12 s	Go	2018-04-26 23:22:27

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.00 s	Haskell	2024-02-10 16:04:11
2	Brent Yorgey	0.01 s	Haskell	2017-12-31 21:28:03
3	Matthew Johnson	0.01 s	Haskell	2018-03-08 23:48:39
4	Håkon Flatval	0.01 s	Haskell	2018-09-04 01:33:58
5	Hidden user	0.01 s	Haskell	2018-11-03 01:30:10
6	Hidden user	0.01 s	Haskell	2019-05-10 16:59:31
7	Hidden user	0.01 s	Haskell	2019-07-24 15:14:19
8	Hidden user	0.01 s	Haskell	2019-08-28 22:16:36
9	Intrets	0.01 s	Haskell	2019-09-04 15:21:41
10	Aurélien Pepin	0.01 s	Haskell	2019-09-29 16:49:49

#	User	Runtime	Language	Date
1	Guangyi Zhou	0.04 s	Java	2025-07-26 12:53:48
2	Hidden user	0.06 s	Java	2025-02-15 16:29:30
3	Amy Colpitts	0.06 s	Java	2025-08-15 00:31:41
4	Luis Varona	0.06 s	Java	2025-08-15 00:33:37
5	Alexander Matheson	0.06 s	Java	2025-08-15 00:38:53
6	Felix De Silva	0.07 s	Java	2017-12-08 13:33:22
7	Finn Lidbetter	0.07 s	Java	2017-12-09 04:50:00
8	Steven Cheng	0.07 s	Java	2017-12-25 22:55:00
9	Kristoffer Åhgren	0.07 s	Java	2017-12-28 18:10:54
10	James Black	0.07 s	Java	2017-12-28 23:51:22

#	User	Runtime	Language	Date
1	Erlend Raa Vågset	0.04 s	JavaScript (Node.js)	2025-10-09 16:08:30
2	Hidden user	0.06 s	JavaScript (Node.js)	2023-11-22 05:39:38
3	Olle Fagerlin	0.07 s	JavaScript (Node.js)	2019-06-03 10:27:33
4	Samuel Högfeldt	0.09 s	JavaScript (Node.js)	2022-08-21 10:45:56
5	Lin Thu Si	0.10 s	JavaScript (Node.js)	2023-02-12 13:50:53
6	Ryan Garber	0.41 s	JavaScript (Node.js)	2022-03-17 20:25:46
7	Benjamin Robillard	0.41 s	JavaScript (Node.js)	2022-03-17 20:25:47
8	Chris Wong	0.42 s	JavaScript (Node.js)	2021-03-01 20:31:49
9	Ram Basnet	0.42 s	JavaScript (Node.js)	2022-03-17 20:24:58
10	Caleb Rodriguez	0.42 s	JavaScript (Node.js)	2022-03-17 20:25:10

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2017-12-31 18:27:56
2	Zachary DeStefano	0.03 s	JavaScript (SpiderMonkey)	2018-09-01 17:11:19
3	Peter Menyes	0.03 s	JavaScript (SpiderMonkey)	2021-09-19 17:59:52
4	Christian Pilegaard Cederquist	0.03 s	JavaScript (SpiderMonkey)	2023-02-05 08:01:38
5	Zach Tschetter	0.03 s	JavaScript (SpiderMonkey)	2023-04-20 20:28:40
6	Evan Magill	0.03 s	JavaScript (SpiderMonkey)	2024-04-06 22:05:22
7	Jimmy Gustafsson	0.03 s	JavaScript (SpiderMonkey)	2024-07-27 19:59:55

#	User	Runtime	Language	Date
1	Timothy Gaede	0.55 s	Julia	2024-03-27 04:03:32

#	User	Runtime	Language	Date
1	Jahid Hasan Imon	0.15 s	Kotlin	2020-06-25 15:02:12
2	Hidden user	0.22 s	Kotlin	2019-12-03 12:08:58
3	Marit van Dijk	0.23 s	Kotlin	2021-09-17 14:08:27
4	Adam Rankin	0.23 s	Kotlin	2023-05-03 17:18:13
5	Zaw Myat	0.25 s	Kotlin	2023-12-19 14:01:02
6	Neil Harmon	0.27 s	Kotlin	2019-08-29 16:38:59
7	Einar Kjellback	0.29 s	Kotlin	2020-08-13 12:51:02
8	Sergey Jakobsen	0.29 s	Kotlin	2021-06-09 21:51:28
9	Ola Sundell	0.30 s	Kotlin	2019-11-16 10:44:11
10	Adnaan Ahmed	0.30 s	Kotlin	2023-01-03 20:54:36

#	User	Runtime	Language	Date
1	Shinji Koshida	0.00 s	Lua	2025-04-11 19:03:32
2	Ivan Marriott	0.00 s	Lua	2025-10-02 01:29:10

#	User	Runtime	Language	Date
1	Vova Podkorytov	0.00 s	Pascal	2018-03-22 13:46:50
2	Egor Shchetinin	0.00 s	Pascal	2018-03-22 13:50:49
3	Ingemar Ragnemalm	0.00 s	Pascal	2018-07-12 21:28:15
4	Magnus Ragnemalm	0.00 s	Pascal	2018-08-15 20:42:30
5	David Connolly	0.00 s	Pascal	2025-08-15 16:52:43

#	User	Runtime	Language	Date
1	Austin Fernandez	0.01 s	PHP	2019-10-08 12:06:35
2	cojonas1	0.01 s	PHP	2021-02-08 11:27:39
3	Victor Santos	0.01 s	PHP	2024-04-22 02:13:29
4	Susanne Ragnemalm	0.01 s	PHP	2024-05-13 21:39:35

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.02 s	Prolog	2018-11-25 09:35:53

#	User	Runtime	Language	Date
1	Alexander Lee	0.03 s	Python 2	2018-04-19 14:30:32
2	Peter Beattie	0.04 s	Python 2	2018-02-27 17:41:18
3	Manu Lam	0.04 s	Python 2	2018-02-27 19:05:23
4	Denis Godunov	0.04 s	Python 2	2018-07-14 15:24:53
5	Nick Wu	0.04 s	Python 2	2018-08-04 03:14:37
6	Jesper Öqvist	0.04 s	Python 2	2018-10-22 16:55:44
7	Jeff Thomas	0.04 s	Python 2	2018-11-29 18:38:00
8	Andrei Stoica	0.04 s	Python 2	2021-10-05 09:53:56
9	Hidden user	0.05 s	Python 2	2017-12-08 13:19:12
10	Rafael Rivas	0.05 s	Python 2	2018-01-30 03:42:39

#	User	Runtime	Language	Date
1	Christofer Ohlsson	0.02 s	Python 3	2017-12-08 17:10:15
2	Arnar Bjarni Arnarson	0.02 s	Python 3	2017-12-09 00:23:24
3	Ciara Godwin	0.02 s	Python 3	2017-12-09 16:25:21
4	Hakan Celik	0.02 s	Python 3	2017-12-09 17:01:56
5	Денис Соболев	0.02 s	Python 3	2017-12-19 09:10:53
6	Mohamed CHADAD	0.02 s	Python 3	2018-01-04 00:09:39
7	Reshab Chhabra	0.02 s	Python 3	2018-01-04 02:55:44
8	Arnav Sastry	0.02 s	Python 3	2018-01-06 00:22:44
9	Marcus Legendre	0.02 s	Python 3	2018-01-10 10:54:57
10	Ritesh Chhabra	0.02 s	Python 3	2018-01-15 04:00:07

#	User	Runtime	Language	Date
1	Macdara mac an tSionnaigh	0.04 s	Ruby	2019-10-04 20:12:40
2	Hidden user	0.05 s	Ruby	2018-10-30 18:41:49
3	Oleg Smelov	0.05 s	Ruby	2019-02-23 22:22:16
4	Hidden user	0.05 s	Ruby	2021-03-06 21:44:30
5	Kok Dith	0.05 s	Ruby	2021-08-22 13:13:22
6	Thomas Feld	0.06 s	Ruby	2023-01-30 13:52:43

#	User	Length	Language	Date
1	Perry Weller (student)	123	APL	2023-10-03 20:18:10

#	User	Length	Language	Date
1	Thomas Feld	71	Bash	2023-10-18 10:32:01
2	Danny Robinson	77	Bash	2023-10-18 02:47:20

#	User	Length	Language	Date
1	a_b__c	172	C	2021-02-03 10:51:40
2	Giang Truong Gia Lac (FUG CT)	258	C	2021-10-16 05:39:21
3	Pham Nguyen Tuan Nguyen (K17_CT)	277	C	2022-10-11 02:20:36
4	Dody Harianto	281	C	2020-10-05 14:38:11
5	Giang Trương Gia Lạc	284	C	2021-06-01 10:54:08
6	Yeswanth Sai Kumar	299	C	2018-09-24 16:00:04
7	Xiang Li	324	C	2018-10-10 06:56:38
8	Ng Wei Jie	324	C	2020-02-17 20:50:17
9	Roberto Kreshna	324	C	2020-11-26 15:05:48
10	Trần Mạnh Hoàng	324	C	2021-10-17 11:15:14

#	User	Length	Language	Date
1	Göran Andersson	448	C#	2022-05-22 03:02:19
2	Ali Aliev	575	C#	2022-01-04 20:49:49
3	Liam Mislej	626	C#	2020-08-14 14:30:25
4	Leon V	670	C#	2019-11-08 14:07:53
5	Roberto Rodriguez Giorgetti	685	C#	2024-09-19 18:52:12
6	Umar Rasyid	704	C#	2025-02-03 05:54:38
7	Fernanda Ferrer Ortega	726	C#	2023-03-12 20:23:38
8	Abdul Fattah	737	C#	2025-05-20 09:08:38
9	Anton Hedström	742	C#	2023-11-24 14:49:42
10	Jesús Ocampo Rodriguez	745	C#	2023-03-09 01:42:21

#	User	Length	Language	Date
1	Frederik Vase	129	C++	2024-07-09 13:57:49
2	Sebastian Falk	143	C++	2024-07-09 14:02:17
3	Yeung Man Tsung	214	C++	2022-12-27 06:54:47
4	Hidden user	217	C++	2025-01-03 22:59:24
5	Way Tan	235	C++	2018-11-28 15:22:24
6	Ganapathy Sanath Balaji	235	C++	2019-08-09 15:12:21
7	Leonardo Blanger	235	C++	2021-03-02 23:56:27
8	traxex	238	C++	2022-01-11 14:42:08
9	Zane Yu	239	C++	2019-01-10 13:40:26
10	William Gan	240	C++	2018-03-10 12:22:49

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	464	F#	2022-10-08 14:34:23

#	User	Length	Language	Date
1	Hidden user	311	Go	2018-11-03 01:11:37
2	Hidden user	345	Go	2023-02-12 05:22:19
3	Ali M. Ismail	430	Go	2018-04-22 23:39:32
4	Michael Johansson	547	Go	2022-11-22 15:58:29
5	Andriy Zyevakov	583	Go	2019-04-14 17:17:24
6	Norbert Voelker	616	Go	2021-04-22 00:56:13
7	James McDermott	632	Go	2018-04-26 23:22:27
8	Krzysztof Gibuła	647	Go	2021-04-15 20:54:57

#	User	Length	Language	Date
1	Håkon Flatval	258	Haskell	2018-09-04 01:33:58
2	Hidden user	287	Haskell	2018-11-03 01:30:10
3	Sebastian Banert	296	Haskell	2025-01-27 01:24:04
4	Hidden user	301	Haskell	2022-12-26 15:03:50
5	Hidden user	312	Haskell	2019-05-10 16:59:31
6	Jan Hrček	315	Haskell	2020-10-21 09:38:22
7	Øyvind Almli	322	Haskell	2021-09-23 00:20:09
8	Brent Yorgey	357	Haskell	2017-12-31 21:28:03
9	Anders Aarsæther	365	Haskell	2021-11-09 13:55:32
10	Vicky Nguyen	369	Haskell	2022-08-26 23:16:45

#	User	Length	Language	Date
1	Amena Deeb	415	Java	2018-07-12 08:10:27
2	Rahnuma Islam	423	Java	2018-01-05 03:31:56
3	Doug Goodman	436	Java	2018-10-25 21:30:54
4	Xuehui Chen	445	Java	2018-07-16 04:53:55
5	Liam Percy	451	Java	2018-10-26 00:29:43
6	Russell Rivard	453	Java	2022-01-11 16:12:20
7	Abdullah Al Rafi Mahmud	455	Java	2022-02-17 08:08:25
8	Andy Nguyen	460	Java	2025-01-22 17:34:47
9	Souhail	469	Java	2018-10-27 22:59:01
10	Matthew Pimienta	470	Java	2022-03-29 08:06:37

#	User	Length	Language	Date
1	Erlend Raa Vågset	266	JavaScript (Node.js)	2025-10-09 16:08:30
2	Peter Kedemo	499	JavaScript (Node.js)	2019-12-28 00:01:02
3	Chris Wong	508	JavaScript (Node.js)	2021-03-01 20:31:49
4	Lin Thu Si	524	JavaScript (Node.js)	2023-02-12 13:50:53
5	Samuel Högfeldt	594	JavaScript (Node.js)	2022-08-21 10:45:56
6	Howard Tin Chi Chan	607	JavaScript (Node.js)	2021-03-01 20:56:51
7	Marko Lazic	644	JavaScript (Node.js)	2020-09-17 13:03:43
8	Hovhannes Kantuni	675	JavaScript (Node.js)	2021-03-04 19:30:16
9	Olle Fagerlin	678	JavaScript (Node.js)	2019-06-03 10:27:33
10	Hidden user	692	JavaScript (Node.js)	2023-11-22 05:39:38

#	User	Length	Language	Date
1	Jimmy Gustafsson	121	JavaScript (SpiderMonkey)	2024-07-27 19:59:55
2	Christian Pilegaard Cederquist	142	JavaScript (SpiderMonkey)	2023-02-05 08:01:38
3	Zach Tschetter	180	JavaScript (SpiderMonkey)	2023-04-20 20:28:40
4	Bjørn Chr. Soltvedt	245	JavaScript (SpiderMonkey)	2017-12-31 18:27:56
5	Zachary DeStefano	290	JavaScript (SpiderMonkey)	2018-09-01 17:11:19
6	Evan Magill	305	JavaScript (SpiderMonkey)	2024-04-06 22:05:22
7	Peter Menyes	437	JavaScript (SpiderMonkey)	2021-09-19 17:59:52

#	User	Length	Language	Date
1	Timothy Gaede	552	Julia	2024-03-27 04:03:32

#	User	Length	Language	Date
1	Einar Kjellback	294	Kotlin	2020-08-13 12:51:02
2	Jahid Hasan Imon	375	Kotlin	2020-06-25 14:44:20
3	Sergey Jakobsen	408	Kotlin	2021-06-09 21:51:28
4	Marit van Dijk	420	Kotlin	2021-09-17 14:08:27
5	Adnaan Ahmed	480	Kotlin	2023-01-03 20:54:36
6	Troy Warmboe	538	Kotlin	2020-02-19 00:13:17
7	Adam Rankin	625	Kotlin	2023-05-03 17:18:13
8	Hidden user	647	Kotlin	2019-12-03 12:08:58
9	Ola Sundell	843	Kotlin	2019-11-16 10:44:11
10	Neil Harmon	998	Kotlin	2019-08-29 16:38:59

#	User	Length	Language	Date
1	Shinji Koshida	298	Lua	2025-04-11 19:03:32
2	Ivan Marriott	341	Lua	2025-10-02 01:29:10

#	User	Length	Language	Date
1	Magnus Ragnemalm	262	Pascal	2018-08-15 20:42:30
2	Ingemar Ragnemalm	297	Pascal	2018-07-12 21:28:15
3	Vova Podkorytov	368	Pascal	2018-03-22 13:46:50
4	Egor Shchetinin	368	Pascal	2018-03-22 13:50:49
5	David Connolly	688	Pascal	2025-08-15 16:52:43

#	User	Length	Language	Date
1	Victor Santos	322	PHP	2024-04-22 02:13:29
2	Austin Fernandez	327	PHP	2019-10-08 12:06:35
3	Susanne Ragnemalm	402	PHP	2024-05-13 21:39:35
4	cojonas1	525	PHP	2021-02-08 11:27:39

#	User	Length	Language	Date
1	Andriy Zyevakov	335	Prolog	2018-11-25 09:35:53

#	User	Length	Language	Date
1	Thomas Feld	114	Python 2	2019-09-04 16:16:30
2	Jesper Öqvist	155	Python 2	2018-10-22 16:55:44
3	Andreas Eisele	159	Python 2	2018-10-07 11:54:20
4	Guan Yang Ze	175	Python 2	2019-09-08 09:09:09
5	Manu Lam	192	Python 2	2018-02-27 19:05:23
6	Johan Lyts	202	Python 2	2019-08-16 15:07:45
7	Garðar Ingvarsson	203	Python 2	2019-09-09 23:47:33
8	Catalin Popa	214	Python 2	2019-01-15 16:47:41
9	Andreas Björklund	216	Python 2	2020-03-08 18:19:01
10	Fuad Mohammed	223	Python 2	2019-11-15 15:40:35

#	User	Length	Language	Date
1	Clement Oh	91	Python 3	2023-08-20 12:00:15
2	Lawry Sorenson	92	Python 3	2023-09-22 03:39:18
3	Morten Clausen	96	Python 3	2022-10-22 16:44:09
4	Thomas Draper	97	Python 3	2023-09-22 03:40:27
5	Josh Taylor	98	Python 3	2023-09-22 18:47:37
6	Farzam Abrishami	102	Python 3	2024-01-21 13:46:24
7	Jade Mawn	112	Python 3	2024-06-25 18:06:32
8	Guk Yi Siong	115	Python 3	2023-09-09 05:57:24
9	Lee Isaac	118	Python 3	2022-11-17 10:14:47
10	Sterling Smith	118	Python 3	2023-09-22 03:44:40

#	User	Length	Language	Date
1	Thomas Feld	78	Ruby	2023-01-30 13:52:43
2	Hidden user	109	Ruby	2021-03-06 21:44:30
3	Hidden user	160	Ruby	2018-10-30 18:41:49
4	Oleg Smelov	166	Ruby	2019-02-23 22:22:16
5	Kok Dith	188	Ruby	2021-08-22 13:13:22
6	Macdara mac an tSionnaigh	387	Ruby	2019-10-04 20:12:40

#	User	Length	Language	Date
1	Shivam Thakur	423	Rust	2019-06-27 15:01:48
2	Hidden user	514	Rust	2018-11-04 20:17:00
3	Joshua Silva	515	Rust	2024-02-08 23:13:43
4	gard heine kalland	527	Rust	2024-04-13 12:30:45
5	Vincent Lagerros	571	Rust	2025-01-26 16:09:51
6	Bas Dirks	588	Rust	2022-01-07 06:11:05
7	Lukman	596	Rust	2021-08-27 09:23:46
8	Pankajkumar Patro	600	Rust	2024-09-13 16:31:58
9	Sawa	650	Rust	2021-03-01 21:08:00
10	Daniel Power	792	Rust	2020-07-29 00:48:49

Solution running time distribution