Problem A
Moscow Dream — Problem Statistics

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Submissions	16451
Accepted submissions	5200
Submission ratio	31.61%
Authors	4840
Full solves [?]	4438
Full solve Ratio	91.69%

#	User	Runtime	Language	Date
1	Johan Clarström	0.01 s	APL	2025-11-23 19:39:29

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-09-03 08:06:02
2	Thomas Feld	0.01 s	Bash	2023-09-13 13:14:35
3	Chenzhang Hu	0.07 s	Bash	2024-05-09 15:45:26

#	User	Runtime	Language	Date
1	Sebastian Gielinger	0.02 s	C#	2019-12-12 12:13:15
2	Linus Ekblom	0.02 s	C#	2019-12-18 09:35:48
3	Thomas Norris	0.02 s	C#	2020-01-06 20:12:04
4	Michael Palkovics	0.02 s	C#	2020-01-23 15:48:31
5	Francois Brunet	0.02 s	C#	2020-01-30 20:45:42
6	Abhishek Gupta	0.02 s	C#	2020-09-21 08:01:07
7	Anders Parsberg Wagner	0.02 s	C#	2020-11-07 10:26:40
8	Chi Tran	0.02 s	C#	2020-12-07 07:55:23
9	Hidden user	0.02 s	C#	2020-12-18 04:41:49
10	Sebastian Sternberg	0.02 s	C#	2021-01-29 21:12:16

#	User	Runtime	Language	Date
1	Hidden user	0.01 s	Common Lisp	2020-01-26 08:22:09
2	crusoe	0.01 s	Common Lisp	2020-07-31 07:13:04
3	David Cawthon	0.01 s	Common Lisp	2020-09-12 16:13:10

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.03 s	F#	2023-01-23 09:18:20

#	User	Runtime	Language	Date
1	José Rivera	0.00 s	Go	2023-05-29 23:18:03
2	GRIBOEDOV	0.00 s	Go	2023-09-04 21:23:56
3	Joneil Negrite	0.00 s	Go	2023-10-03 15:56:44
4	Husain Satan	0.00 s	Go	2023-11-10 10:58:51
5	Albert Leung	0.00 s	Go	2024-08-10 02:48:22
6	Syahril Maula Yahya	0.00 s	Go	2024-08-24 15:03:16
7	n k	0.00 s	Go	2025-01-10 18:48:23
8	Hidden user	0.02 s	Go	2023-04-04 19:00:24
9	Conrad Parker	0.08 s	Go	2020-08-11 23:25:36
10	Hidden user	0.08 s	Go	2020-10-20 03:30:07

#	User	Runtime	Language	Date
1	Brandon Tang	0.00 s	Haskell	2022-07-28 04:04:45
2	Nicholas Marsh	0.00 s	Haskell	2022-09-16 19:52:01
3	Matthew Gvasalia	0.00 s	Haskell	2023-04-16 21:21:36
4	Li Jun	0.00 s	Haskell	2023-06-20 16:57:51
5	vagabundus	0.00 s	Haskell	2024-05-02 19:05:24
6	Trung Do	0.00 s	Haskell	2025-06-14 23:29:11
7	Brent Yorgey	0.01 s	Haskell	2019-12-11 23:49:44
8	Aurélien Pepin	0.01 s	Haskell	2019-12-24 23:36:04
9	Daniel Cabral	0.01 s	Haskell	2019-12-26 07:29:13
10	Hidden user	0.01 s	Haskell	2020-01-09 18:24:53

#	User	Runtime	Language	Date
1	CUX "INDIO" PRADA	0.04 s	Java	2024-08-07 02:10:55
2	Vashista Basava	0.04 s	Java	2024-08-10 13:08:57
3	Ahsan Malik	0.04 s	Java	2024-10-04 09:01:02
4	Elton Murillo	0.04 s	Java	2025-02-09 16:57:26
5	Tony Chen	0.04 s	Java	2025-04-05 17:49:25
6	Pavel M	0.05 s	Java	2024-04-07 19:47:56
7	Ku Brian	0.05 s	Java	2024-05-13 10:23:27
8	Julius Griebel	0.05 s	Java	2024-05-13 20:20:18
9	Hidden user	0.05 s	Java	2024-05-15 18:15:55
10	Jannik We	0.06 s	Java	2020-05-17 21:03:54

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	JavaScript (Node.js)	2024-11-04 07:12:35
2	Rizky Muliawan	0.05 s	JavaScript (Node.js)	2024-02-22 12:15:25
3	anchorpad	0.09 s	JavaScript (Node.js)	2023-01-14 07:16:33
4	Peter Kedemo	0.42 s	JavaScript (Node.js)	2020-01-01 12:40:05
5	Antony Santos	0.42 s	JavaScript (Node.js)	2020-03-27 20:25:07
6	Hidden user	0.42 s	JavaScript (Node.js)	2020-08-06 23:35:26
7	Andoko Chandra	0.42 s	JavaScript (Node.js)	2020-10-13 15:13:20
8	Imran Brown	0.42 s	JavaScript (Node.js)	2020-11-11 03:56:20
9	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-03-05 09:37:54
10	Chris Wong	0.42 s	JavaScript (Node.js)	2021-03-05 11:38:36

#	User	Runtime	Language	Date
1	Peter Menyes	0.02 s	JavaScript (SpiderMonkey)	2021-08-24 20:49:32
2	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-02-11 00:03:50
3	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2024-07-21 14:34:45
4	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2019-12-10 02:35:41

#	User	Runtime	Language	Date
1	Timothy Gaede	0.38 s	Julia	2024-04-10 15:28:57
2	Danny Robinson	0.57 s	Julia	2023-09-03 08:04:06

#	User	Runtime	Language	Date
1	Ola Sundell	0.14 s	Kotlin	2021-05-22 22:13:36
2	Marit van Dijk	0.14 s	Kotlin	2021-09-17 09:42:56
3	Sergei Dryganets	0.14 s	Kotlin	2022-05-26 23:19:23
4	James WIlliams	0.15 s	Kotlin	2020-08-28 04:32:03
5	Hidden user	0.16 s	Kotlin	2019-12-23 22:15:47
6	arda atci	0.18 s	Kotlin	2020-07-11 01:23:35
7	Pavlo Stavytskyi	0.18 s	Kotlin	2022-07-29 03:42:18
8	Luis Flores	0.18 s	Kotlin	2023-06-09 00:18:08
9	SatishKumar Gollapudi	0.18 s	Kotlin	2023-06-26 11:14:49
10	Adam Koprowski	0.19 s	Kotlin	2020-08-11 01:00:27

#	User	Runtime	Language	Date
1	Antonio Fernandez	0.00 s	Lua	2024-12-21 18:52:13

#	User	Runtime	Language	Date
1	Matthew Lutze	0.00 s	OCaml	2020-05-23 06:40:39
2	Steven Halim	0.00 s	OCaml	2020-07-05 17:23:21
3	Philip Pham	0.00 s	OCaml	2020-08-05 02:22:22
4	addamove	0.00 s	OCaml	2021-01-30 23:46:31
5	Danil Braun	0.00 s	OCaml	2021-05-06 16:47:58
6	Enzo Gurgel	0.00 s	OCaml	2023-07-27 23:10:57
7	Sebastian Banert	0.00 s	OCaml	2024-07-28 13:31:06
8	Xiu-Heng Hua	0.00 s	OCaml	2024-08-06 18:23:21
9	Julia Plotnikova	0.00 s	OCaml	2024-08-07 09:33:01
10	Hidden user	0.00 s	OCaml	2025-06-22 13:28:35

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2019-12-19 20:16:29
2	Minh Nhựt Đặng	0.00 s	Pascal	2022-07-18 05:59:28

#	User	Runtime	Language	Date
1	Connor Billings	0.01 s	PHP	2020-01-02 01:58:43
2	陳建宏	0.01 s	PHP	2021-05-04 17:52:30
3	Renate	0.01 s	PHP	2021-05-11 02:36:33
4	Mochi Cake	0.01 s	PHP	2023-09-17 17:42:30

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.02 s	Prolog	2022-12-13 16:04:05
2	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-12 17:44:20

#	User	Runtime	Language	Date
1	Nguyen Thanh Trung	0.03 s	Python 2	2019-12-03 17:57:30
2	Thomas Feld	0.03 s	Python 2	2019-12-10 10:31:42
3	Johan Lyts	0.03 s	Python 2	2019-12-10 14:23:33
4	Mark Thomas	0.03 s	Python 2	2019-12-12 02:56:28
5	Noble Mushtak	0.03 s	Python 2	2020-01-18 01:58:52
6	Andreas Björklund	0.03 s	Python 2	2020-01-21 16:27:27
7	Guan Yang Ze	0.03 s	Python 2	2020-03-13 14:20:34
8	Yanmarshus Bachtiar	0.03 s	Python 2	2020-08-18 16:21:24
9	Björn Martinsson	0.03 s	Python 2	2020-08-27 17:59:50
10	Andrei Stoica	0.03 s	Python 2	2020-10-29 15:18:57

#	User	Runtime	Language	Date
1	Vương Thiện Trung	0.02 s	Python 3	2019-12-06 03:29:28
2	Nhân Trần Nguyễn	0.02 s	Python 3	2019-12-06 05:42:11
3	Cáo Quảng	0.02 s	Python 3	2019-12-06 05:42:46
4	April Chao	0.02 s	Python 3	2019-12-10 04:09:03
5	Vincent Tandya	0.02 s	Python 3	2019-12-10 04:56:21
6	Bryan Wong Wei Heng	0.02 s	Python 3	2019-12-10 06:51:20
7	Jason Cannon	0.02 s	Python 3	2019-12-10 16:18:07
8	すうぇっりえるはこん	0.02 s	Python 3	2019-12-10 22:46:49
9	Jack Yeo	0.02 s	Python 3	2019-12-11 11:17:59
10	Charley Sheaffer	0.02 s	Python 3	2019-12-11 23:14:33

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	Ruby	2019-12-17 00:37:24
2	Hidden user	0.05 s	Ruby	2021-07-04 12:54:23
3	Thomas Feld	0.06 s	Ruby	2023-01-11 12:12:10
4	michael r lederle	0.06 s	Ruby	2023-01-13 04:38:25
5	Blake Dixon	0.07 s	Ruby	2023-11-14 03:14:02
6	Russell Ng	0.07 s	Ruby	2025-05-20 09:43:33
7	Chenzhang Hu	0.12 s	Ruby	2025-09-22 16:09:25

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Swift	2024-09-03 21:25:18

#	User	Length	Language	Date
1	Johan Clarström	79	APL	2025-11-23 21:48:27

#	User	Length	Language	Date
1	Thomas Feld	48	Bash	2023-09-13 13:39:38
2	Danny Robinson	53	Bash	2023-09-03 08:06:02
3	Chenzhang Hu	60	Bash	2025-09-13 01:23:09

#	User	Length	Language	Date
1	Eduardo Núñez	93	C	2024-02-25 16:31:00
2	Pranjan Sana	170	C	2025-09-23 09:24:51
3	zeno	181	C	2025-01-04 16:08:15
4	FreedomKnight	186	C	2022-02-04 04:36:16
5	Austin Calder	187	C	2023-10-25 17:08:41
6	Leslie Yip	191	C	2022-09-07 06:49:31
7	Andrew Roberts	193	C	2019-12-13 23:21:54
8	Diego Pinheiro	193	C	2023-04-18 12:26:53
9	Jared Blase Sy	197	C	2020-10-20 09:54:58
10	Dean Menezes	201	C	2022-05-08 23:34:10

#	User	Length	Language	Date
1	Hidden user	274	C#	2024-07-31 15:45:32
2	florist swe	285	C#	2024-12-07 23:05:49
3	Yevgeniy Sheyer	320	C#	2025-02-17 01:27:21
4	Esty Crow	400	C#	2025-05-16 08:05:16
5	clarence chen	415	C#	2025-05-16 19:07:22
6	Gustav Junedahl	431	C#	2022-04-25 11:19:05
7	Adiseshu Utukuri	466	C#	2023-04-18 19:52:18
8	Göran Andersson	484	C#	2022-05-16 19:17:05
9	Thomas Norris	520	C#	2020-01-06 20:12:04
10	Michael Palkovics	526	C#	2020-01-23 15:48:31

#	User	Length	Language	Date
1	Hakan Kjellerstrand	109	C++	2025-02-15 09:09:26
2	Tyler Fernando	112	C++	2022-11-05 12:49:19
3	Ralf Merhof	113	C++	2024-05-17 21:25:12
4	Lukas Fried	138	C++	2022-11-22 12:20:37
5	Hidden user	149	C++	2025-07-28 20:30:13
6	Jalvin Chan Jia Xiang	155	C++	2020-01-03 05:17:25
7	Way Tan	157	C++	2020-01-30 12:46:58
8	Moamen Albyaa	158	C++	2024-07-27 22:29:41
9	Thái Phúc Tiến	159	C++	2024-11-04 16:11:04
10	Sam Farrell	163	C++	2022-12-27 08:08:57

#	User	Length	Language	Date
1	crusoe	203	Common Lisp	2020-07-31 07:13:04
2	Hidden user	250	Common Lisp	2020-01-26 08:30:32
3	David Cawthon	313	Common Lisp	2020-09-12 16:13:10

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	342	F#	2023-01-23 09:18:20

#	User	Length	Language	Date
1	n k	211	Go	2025-01-10 18:48:23
2	Hidden user	216	Go	2023-04-04 19:00:24
3	Conrad Parker	219	Go	2020-08-11 23:25:36
4	José Rivera	251	Go	2023-05-29 23:22:51
5	Mandala Binsar	268	Go	2020-11-13 16:10:19
6	Resa Renaldy	271	Go	2021-07-16 05:52:13
7	GRIBOEDOV	291	Go	2023-09-04 21:23:56
8	Joneil Negrite	321	Go	2023-10-03 15:56:44
9	Husain Satan	366	Go	2023-11-10 10:58:51
10	Syahril Maula Yahya	370	Go	2024-08-24 15:03:16

#	User	Length	Language	Date
1	Li Jun	155	Haskell	2023-06-20 16:57:51
2	Steinar Simonnes	178	Haskell	2024-03-23 19:42:24
3	Nicholas Marsh	186	Haskell	2022-09-16 19:52:01
4	Matthew Gvasalia	211	Haskell	2023-04-16 21:21:36
5	Zach Tschetter	224	Haskell	2020-11-02 04:05:07
6	Øyvind Almli	236	Haskell	2021-09-22 23:12:39
7	Brent Yorgey	284	Haskell	2019-12-11 23:49:44
8	Yen Tien	285	Haskell	2021-01-31 04:32:28
9	Brandon Tang	292	Haskell	2022-07-28 04:04:45
10	Jan Hrček	336	Haskell	2020-11-21 09:34:18

#	User	Length	Language	Date
1	Gloriouz Zeus	296	Java	2023-04-22 16:22:11
2	Clayton Almeida	299	Java	2024-07-21 22:08:26
3	Viraj Modi	299	Java	2024-10-27 16:15:27
4	Léo BOUDER	301	Java	2023-04-21 20:17:33
5	Mayur Suresh	303	Java	2022-01-03 20:13:14
6	Kayla Williams	305	Java	2022-10-04 22:10:25
7	Kayla Williams	305	Java	2022-10-04 22:11:47
8	Stephen Young	310	Java	2023-01-04 01:08:24
9	JamJam	310	Java	2023-04-21 16:42:33
10	Kaka Richaard	312	Java	2022-09-17 19:39:52

#	User	Length	Language	Date
1	Peter Kedemo	318	JavaScript (Node.js)	2020-01-01 12:40:05
2	Erick De Santiago Anaya	406	JavaScript (Node.js)	2021-05-22 01:02:58
3	Rizky Muliawan	430	JavaScript (Node.js)	2024-02-22 12:15:25
4	Chris Wong	471	JavaScript (Node.js)	2021-03-05 11:38:36
5	Hidden user	481	JavaScript (Node.js)	2020-08-06 23:35:26
6	anchorpad	491	JavaScript (Node.js)	2023-01-14 07:16:33
7	Bart Louwers	512	JavaScript (Node.js)	2022-02-06 13:46:02
8	Imran Brown	525	JavaScript (Node.js)	2020-11-11 03:56:20
9	Howard Tin Chi Chan	538	JavaScript (Node.js)	2021-03-05 09:37:54
10	Hidden user	593	JavaScript (Node.js)	2024-11-04 07:12:35

#	User	Length	Language	Date
1	Jimmy Gustafsson	72	JavaScript (SpiderMonkey)	2024-07-21 14:34:45
2	Christian Pilegaard Cederquist	83	JavaScript (SpiderMonkey)	2023-02-11 00:03:50
3	Peter Menyes	132	JavaScript (SpiderMonkey)	2021-08-24 20:49:32
4	Bjørn Chr. Soltvedt	178	JavaScript (SpiderMonkey)	2019-12-10 02:35:41

#	User	Length	Language	Date
1	Danny Robinson	81	Julia	2023-09-03 08:04:06
2	Timothy Gaede	212	Julia	2024-04-10 15:28:57

#	User	Length	Language	Date
1	Danny Mittal	162	Kotlin	2021-01-30 19:08:13
2	SatishKumar Gollapudi	163	Kotlin	2023-06-26 11:14:49
3	Sergey Jakobsen	178	Kotlin	2021-03-25 13:41:28
4	Einar Kjellback	195	Kotlin	2019-12-17 18:19:43
5	Thanh Le	199	Kotlin	2020-10-02 04:24:04
6	Pavlo Stavytskyi	212	Kotlin	2022-07-29 03:42:18
7	Richard Li	232	Kotlin	2021-01-30 19:08:13
8	Emil Wihlander	233	Kotlin	2024-07-29 18:14:55
9	Adam Koprowski	237	Kotlin	2020-08-11 01:00:27
10	Dayan Ruben Gonzalez	299	Kotlin	2020-10-07 19:18:54

#	User	Length	Language	Date
1	Antonio Fernandez	204	Lua	2024-12-21 18:52:13

#	User	Length	Language	Date
1	Xiu-Heng Hua	189	OCaml	2024-08-06 18:23:21
2	addamove	208	OCaml	2021-01-30 23:46:31
3	Steven Halim	210	OCaml	2020-07-05 17:23:21
4	Sebastian Banert	212	OCaml	2024-07-28 13:31:06
5	Julia Plotnikova	219	OCaml	2024-08-07 09:33:01
6	Philip Pham	266	OCaml	2020-08-05 02:22:22
7	Danil Braun	269	OCaml	2021-05-06 16:47:58
8	Matthew Lutze	327	OCaml	2020-05-23 06:40:39
9	Hidden user	331	OCaml	2025-06-22 13:28:35
10	Enzo Gurgel	507	OCaml	2023-07-27 23:10:57

#	User	Length	Language	Date
1	Ingemar Ragnemalm	182	Pascal	2019-12-19 20:16:29
2	Minh Nhựt Đặng	232	Pascal	2022-07-18 05:59:28

#	User	Length	Language	Date
1	Renate	135	PHP	2021-05-11 02:36:33
2	Mochi Cake	178	PHP	2023-09-17 17:42:30
3	Connor Billings	237	PHP	2020-01-02 01:58:43
4	陳建宏	309	PHP	2021-05-04 17:52:30

#	User	Length	Language	Date
1	Hakan Kjellerstrand	235	Prolog	2023-02-12 17:44:20
2	Andriy Zyevakov	495	Prolog	2022-12-13 16:04:05

#	User	Length	Language	Date
1	Thomas Feld	78	Python 2	2019-12-10 10:31:42
2	Guan Yang Ze	118	Python 2	2020-03-13 14:20:34
3	Andreas Björklund	119	Python 2	2020-01-21 16:27:27
4	Johan Lyts	128	Python 2	2019-12-10 14:23:33
5	Nguyen Thanh Trung	147	Python 2	2019-12-03 17:57:30
6	Björn Martinsson	194	Python 2	2020-08-27 17:59:50
7	Yanmarshus Bachtiar	229	Python 2	2020-08-18 16:21:24
8	Mark Thomas	244	Python 2	2019-12-12 02:56:28
9	emma barbisan	246	Python 2	2021-02-16 00:26:01
10	Noble Mushtak	252	Python 2	2020-01-18 01:58:52

#	User	Length	Language	Date
1	Benjamin Z White	73	Python 3	2023-04-03 14:08:17
2	Guk Yi Siong	74	Python 3	2022-11-18 08:31:38
3	Nguyên Khôi Đỗ	75	Python 3	2024-12-16 01:10:36
4	Charles Ancheta	77	Python 3	2023-03-25 09:50:48
5	Tai Tze Kin	79	Python 3	2024-01-14 17:46:10
6	David Aldenbro	85	Python 3	2025-07-02 09:38:05
7	Mattéo	87	Python 3	2022-10-03 22:14:07
8	Eduardo Núñez	87	Python 3	2024-02-25 16:34:03
9	Troels Bjerre Lund	90	Python 3	2021-04-17 19:19:22
10	Alexandre Douard	90	Python 3	2023-10-10 18:00:55

#	User	Length	Language	Date
1	Thomas Feld	60	Ruby	2023-08-29 13:48:34
2	Russell Ng	69	Ruby	2025-05-20 09:43:33
3	Hidden user	90	Ruby	2021-07-04 12:54:23
4	Blake Dixon	122	Ruby	2023-11-14 03:14:02
5	Chenzhang Hu	160	Ruby	2025-09-22 16:09:25
6	michael r lederle	310	Ruby	2023-01-13 04:38:25
7	Hidden user	347	Ruby	2019-12-17 00:37:24

#	User	Length	Language	Date
1	Vincent Lagerros	215	Rust	2024-12-03 22:55:26
2	Ishtiaq Hussain Naqi	324	Rust	2024-10-14 09:25:33
3	Hidden user	384	Rust	2024-04-07 22:48:57
4	David Zacek	394	Rust	2021-06-08 18:35:39
5	Pankajkumar Patro	416	Rust	2024-08-21 16:36:50
6	Sarch Reato	418	Rust	2025-09-21 14:06:16
7	Hidden user	422	Rust	2025-11-29 21:02:32
8	Grant Greer	447	Rust	2024-10-31 00:52:42
9	Hidden user	453	Rust	2022-09-25 01:19:57
10	Thobias Larsen	475	Rust	2023-01-10 22:37:07

#	User	Length	Language	Date
1	Hidden user	369	Swift	2024-09-03 21:25:18

Solution running time distribution