Problem A
ACM Contest Scoring — Problem Statistics

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Submissions	15069
Accepted submissions	8404
Submission ratio	55.77%
Authors	7908
Full solves [?]	7346
Full solve Ratio	92.89%

#	User	Runtime	Language	Date
1	Hidden user	0.02 s	APL	2023-03-11 10:56:47

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.02 s	C#	2015-12-01 20:20:12
2	Patrick Johannessen	0.02 s	C#	2015-12-15 07:18:47
3	Jens Mossig	0.02 s	C#	2015-12-24 11:13:56
4	Yuwono Bangun Nagoro	0.02 s	C#	2016-01-23 02:18:50
5	Jay Hal	0.02 s	C#	2016-02-07 21:20:14
6	Hidden user	0.02 s	C#	2016-02-11 10:25:08
7	Faisal Rahman	0.02 s	C#	2016-04-02 05:07:16
8	Luiz Miranda	0.02 s	C#	2016-04-02 21:14:38
9	Joe Amenta	0.02 s	C#	2016-04-05 00:05:24
10	Khin Nyunt	0.02 s	C#	2016-04-13 09:20:06

#	User	Runtime	Language	Date
1	Patrik Nyman	0.01 s	Common Lisp	2022-09-04 08:58:17
2	David Cawthon	0.02 s	Common Lisp	2019-04-10 02:34:08

#	User	Runtime	Language	Date
1	Patrick Bahr	0.04 s	F#	2021-02-20 22:21:55
2	Jacob Harris Cryer Kragh	0.05 s	F#	2022-06-12 13:51:43

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	Java	2025-02-07 18:04:50
2	Nick Wu	0.05 s	Java	2015-11-08 00:06:21
3	Brandon Morris	0.05 s	Java	2015-11-10 15:08:42
4	Matthew Worley	0.05 s	Java	2015-11-10 20:35:01
5	AJ Johnson	0.05 s	Java	2015-11-12 02:35:58
6	Victor Sui	0.05 s	Java	2015-11-13 03:34:24
7	Fredrik Sy	0.05 s	Java	2015-11-13 16:35:53
8	Zimu Qin	0.05 s	Java	2015-11-14 21:52:17
9	Eskil Jarlskog	0.05 s	Java	2015-11-21 14:23:13
10	Jonas Dahl	0.05 s	Java	2015-11-24 18:42:29

#	User	Runtime	Language	Date
1	Calvin Reibenspieß	0.04 s	JavaScript (Node.js)	2024-02-18 19:14:24
2	Hidden user	0.04 s	JavaScript (Node.js)	2025-02-18 21:51:19
3	Nicola Ye	0.04 s	JavaScript (Node.js)	2025-04-10 23:07:51
4	simonaebid	0.04 s	JavaScript (Node.js)	2025-09-16 10:56:52
5	Ram Basnet	0.05 s	JavaScript (Node.js)	2018-09-27 16:12:21
6	Sander Hellesø	0.05 s	JavaScript (Node.js)	2019-04-20 07:53:05
7	Redho Darmawan	0.05 s	JavaScript (Node.js)	2024-04-22 04:04:58
8	Hidden user	0.05 s	JavaScript (Node.js)	2025-01-26 21:22:00
9	Samuel Högfeldt	0.08 s	JavaScript (Node.js)	2022-06-29 21:14:25
10	Ben Rodkin	0.08 s	JavaScript (Node.js)	2022-10-06 20:41:19

#	User	Runtime	Language	Date
1	Bjørn Zeiler Hougaard	0.01 s	JavaScript (SpiderMonkey)	2015-11-10 18:04:28
2	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-17 23:47:21
3	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-01-06 19:31:37
4	Johannes Jensen	0.01 s	JavaScript (SpiderMonkey)	2016-03-05 16:26:48
5	Tim Oram	0.01 s	JavaScript (SpiderMonkey)	2016-03-14 02:51:58
6	Gabriel Lau	0.01 s	JavaScript (SpiderMonkey)	2016-03-24 02:05:49
7	Hà Minh Ngọc	0.01 s	JavaScript (SpiderMonkey)	2016-07-26 11:45:29
8	Stephen Huh	0.01 s	JavaScript (SpiderMonkey)	2016-10-01 21:00:45
9	J M	0.01 s	JavaScript (SpiderMonkey)	2016-10-06 20:26:27
10	Knut Salomonsson	0.01 s	JavaScript (SpiderMonkey)	2016-11-01 10:42:02

#	User	Runtime	Language	Date
1	Timothy Gaede	0.50 s	Julia	2024-04-28 08:38:08

#	User	Runtime	Language	Date
1	Albert Pala	0.12 s	Kotlin	2021-06-29 12:58:26
2	Слава Гуляев	0.13 s	Kotlin	2017-11-07 12:56:48
3	Jacob Huebner	0.18 s	Kotlin	2020-03-17 00:48:44
4	Adam Rankin	0.18 s	Kotlin	2023-05-11 20:43:06
5	Yang Tang	0.18 s	Kotlin	2023-07-28 07:22:23
6	Filip Belik	0.19 s	Kotlin	2019-10-24 00:39:05
7	Adam Koprowski	0.19 s	Kotlin	2020-09-11 18:22:39
8	James WIlliams	0.19 s	Kotlin	2020-09-26 06:21:14
9	Dayan Ruben Gonzalez	0.19 s	Kotlin	2020-10-01 04:16:20
10	Johnny Baloney	0.19 s	Kotlin	2021-09-12 20:50:32

#	User	Runtime	Language	Date
1	Shehab Ahmed Hatem	0.00 s	Lua	2023-12-04 16:29:49

#	User	Runtime	Language	Date
1	Yuanting Mao	0.00 s	OCaml	2023-08-02 22:51:38

#	User	Runtime	Language	Date
1	Mark Terwilliger	0.00 s	Pascal	2017-09-27 04:46:55
2	Ingemar Ragnemalm	0.00 s	Pascal	2017-12-18 11:25:30
3	Hobert Ho	0.00 s	Pascal	2022-07-22 11:54:48

#	User	Runtime	Language	Date
1	Denis BAURAIN	0.01 s	Perl	2025-12-29 13:15:18

#	User	Runtime	Language	Date
1	Martin Dibakar Björling	0.01 s	PHP	2015-11-24 13:10:12
2	Silvena Lam	0.01 s	PHP	2016-02-06 17:34:40
3	Steven D. Wilson	0.01 s	PHP	2016-03-26 02:16:06
4	Denis Alimov	0.01 s	PHP	2018-01-23 08:47:46
5	Alessandro Pasqualini	0.01 s	PHP	2019-01-14 14:14:46
6	Jonas Lindenskov Nielsen	0.01 s	PHP	2019-11-12 08:36:06
7	Kamal Nayak	0.01 s	PHP	2020-03-09 22:03:08
8	Mattéo Ladrat	0.01 s	PHP	2020-11-26 23:07:20
9	Renate	0.01 s	PHP	2021-05-11 00:11:17
10	陳建宏	0.01 s	PHP	2021-06-13 08:58:32

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-04 21:03:48

#	User	Runtime	Language	Date
1	Christofer Ohlsson	0.02 s	Python 2	2015-11-08 12:17:24
2	Asger Hautop Drewsen	0.02 s	Python 2	2015-11-08 16:11:07
3	Uttam Thakore	0.02 s	Python 2	2015-11-11 22:52:03
4	Drew Torgeson	0.02 s	Python 2	2015-11-12 19:30:45
5	Thomas Simmons	0.02 s	Python 2	2015-11-13 07:14:34
6	Frederik Højholt	0.02 s	Python 2	2015-11-13 09:14:56
7	Urban Pettersson	0.02 s	Python 2	2015-11-14 16:38:58
8	Hans Rusten	0.02 s	Python 2	2015-11-15 15:27:22
9	David Pintor Jr.	0.02 s	Python 2	2015-11-17 21:29:10
10	Hidden user	0.02 s	Python 2	2015-12-20 19:04:46

#	User	Runtime	Language	Date
1	Jack Rosenthal	0.02 s	Python 3	2015-11-15 04:31:09
2	Emil Riis Hansen	0.02 s	Python 3	2015-11-21 12:06:38
3	Johannes Agestam	0.02 s	Python 3	2015-12-09 15:57:16
4	Filip Sjögren	0.02 s	Python 3	2015-12-19 10:51:50
5	Tianyu Zhang	0.02 s	Python 3	2016-01-10 01:41:55
6	Wayne	0.02 s	Python 3	2016-01-20 21:49:23
7	Martin Stensgård	0.02 s	Python 3	2016-01-24 03:12:10
8	Joshua Martin Tjahjadi	0.02 s	Python 3	2016-02-02 16:33:48
9	unkownfire25	0.02 s	Python 3	2016-02-10 14:47:24
10	Øyvind Johansen Amundrud	0.02 s	Python 3	2016-02-16 17:59:59

#	User	Runtime	Language	Date
1	Jinwoo Lee	0.22 s	Racket	2025-02-01 21:26:12

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2015-12-30 23:54:59
2	Gerry Hall	0.03 s	Ruby	2016-03-25 06:50:49
3	Lasse Berglund	0.03 s	Ruby	2016-03-30 13:04:38
4	Kellen Watt	0.03 s	Ruby	2016-06-04 02:46:02
5	Erik Rydbert	0.03 s	Ruby	2016-07-12 05:34:49
6	Sebastian Craig	0.03 s	Ruby	2016-10-18 07:31:56
7	Kevin Suwala	0.03 s	Ruby	2017-01-08 21:58:31
8	Tyler Yasaka	0.03 s	Ruby	2017-11-12 21:25:47
9	Paul Vinell	0.04 s	Ruby	2018-04-18 12:00:39
10	Hidden user	0.04 s	Ruby	2019-02-16 22:08:06

#	User	Runtime	Language	Date
1	Cyril Chaize	0.05 s	TypeScript	2024-01-07 18:17:11

#	User	Runtime	Language	Date
1	Krishan Leong	0.04 s	Visual Basic	2024-02-20 23:28:10

#	User	Runtime	Language	Date
1	Joe Blower	0.00 s	Zig	2025-05-22 21:12:26

#	User	Length	Language	Date
1	Hidden user	213	APL	2023-03-11 10:56:47

#	User	Length	Language	Date
1	Benjamin Iserman	121	C	2023-04-13 21:06:07
2	Sawyer Frie	146	C	2023-04-13 04:58:06
3	Hrant Hovhannisyan	331	C	2017-04-05 11:11:43
4	Mouad Naciri	387	C	2017-04-09 15:08:42
5	Matteus Barreto	389	C	2017-06-13 20:03:31
6	Stefan Kennedy	404	C	2017-03-21 09:42:42
7	Hidden user	407	C	2017-01-24 15:33:13
8	Kevin Surya Pranata	415	C	2018-11-11 02:58:22
9	Ximun Castoreo	423	C	2020-07-09 11:04:49
10	Anton Haglund	435	C	2016-11-17 23:15:18

#	User	Length	Language	Date
1	李陆屿	519	C#	2019-05-02 18:24:18
2	Stanley Tay	655	C#	2018-08-07 11:13:03
3	Shaun Lazaro	711	C#	2016-11-26 20:29:48
4	Sven	715	C#	2024-02-12 21:01:58
5	Nathan Andrews	733	C#	2024-08-20 22:16:41
6	Jack Bulan	775	C#	2016-09-07 02:29:32
7	Hidden user	783	C#	2020-12-14 04:07:07
8	Marek Bina	793	C#	2019-02-25 10:35:23
9	Kunwei Zhang	797	C#	2018-02-06 03:32:43
10	Alejandro Lazaro	801	C#	2023-07-05 14:51:10

#	User	Length	Language	Date
1	Hakan Kjellerstrand	218	C++	2025-03-01 22:56:03
2	Frederick Pek	275	C++	2021-06-01 12:58:05
3	bilise hussein	281	C++	2019-12-07 13:22:40
4	Đậu Huy Minh	290	C++	2022-10-16 17:14:36
5	葉羽	291	C++	2020-05-30 18:49:28
6	Yury Kuvshynov	302	C++	2021-10-06 22:13:15
7	Yeung Man Tsung	302	C++	2022-12-30 08:16:51
8	Herman Karlsson	308	C++	2015-12-09 15:51:11
9	Ical Firdaus	310	C++	2016-01-28 07:40:44
10	Youssef Osrhir	313	C++	2019-05-13 01:40:34

#	User	Length	Language	Date
1	David Cawthon	851	Common Lisp	2019-04-10 02:34:08
2	Patrik Nyman	863	Common Lisp	2022-09-04 08:58:17

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1287	F#	2022-06-12 13:51:43
2	Patrick Bahr	2294	F#	2021-02-20 22:21:55

#	User	Length	Language	Date
1	Arne Philipeit	383	Go	2019-01-16 04:08:25
2	Matthew Ling	467	Go	2018-01-08 04:43:17
3	Ken Mango	467	Go	2019-04-27 06:28:03
4	Ng Wei Jie	467	Go	2020-02-17 13:28:09
5	Mubarek Shikur	467	Go	2022-06-28 16:06:58
6	Mubarek Shikur	467	Go	2022-10-19 18:09:05
7	Alfredo Ruiz	467	Go	2022-12-03 21:03:06
8	Sky	467	Go	2022-12-03 22:25:53
9	Gabriel Mena	467	Go	2023-05-06 19:36:59
10	Sarah Odigie	467	Go	2023-05-06 19:43:09

#	User	Length	Language	Date
1	Brent Yorgey	371	Haskell	2017-10-04 23:45:28
2	Li Jun	492	Haskell	2023-06-21 12:06:17
3	Wisut Hantanong	511	Haskell	2016-11-25 13:25:10
4	Håkon Flatval	562	Haskell	2018-08-10 18:29:26
5	David Zacek	573	Haskell	2021-05-11 15:27:39
6	Hidden user	643	Haskell	2019-08-13 18:23:24
7	Arnold Meijster	667	Haskell	2025-12-13 17:25:59
8	Bernardo Brust	687	Haskell	2025-07-29 14:36:22
9	Steinar Simonnes	727	Haskell	2023-05-31 00:07:52
10	Anthony Clays	741	Haskell	2017-01-01 18:08:55

#	User	Length	Language	Date
1	Doug Goodman	464	Java	2017-07-30 02:07:53
2	Natalie Longtin	502	Java	2017-10-30 19:52:52
3	William Brigham	503	Java	2017-04-18 05:02:18
4	Eric Xu	504	Java	2020-08-14 22:44:59
5	Mahfoud Othman	514	Java	2016-10-01 23:34:12
6	Gerry Mooney	520	Java	2019-06-12 00:01:23
7	Caeden Whitaker	528	Java	2020-07-05 20:14:34
8	Yifan Sun	537	Java	2021-01-20 17:26:23
9	Stephen Leskowat	539	Java	2023-12-02 21:12:37
10	Wu Jun Jie	542	Java	2019-03-06 16:13:07

#	User	Length	Language	Date
1	Antoine Bauri	666	JavaScript (Node.js)	2021-02-21 17:38:09
2	Ram Basnet	691	JavaScript (Node.js)	2018-09-27 16:12:21
3	lili	699	JavaScript (Node.js)	2023-03-07 11:39:52
4	Calvin Reibenspieß	719	JavaScript (Node.js)	2024-02-18 19:14:24
5	Samuel Högfeldt	723	JavaScript (Node.js)	2022-06-29 21:14:25
6	Aaron	725	JavaScript (Node.js)	2022-11-17 05:11:41
7	_notSalt	753	JavaScript (Node.js)	2019-11-21 07:54:33
8	Ben Rodkin	754	JavaScript (Node.js)	2022-10-06 20:41:19
9	Howard Tin Chi Chan	770	JavaScript (Node.js)	2021-02-07 13:20:48
10	Emil Larsson	794	JavaScript (Node.js)	2019-11-30 13:17:53

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	145	JavaScript (SpiderMonkey)	2022-11-13 03:09:40
2	Jimmy Gustafsson	192	JavaScript (SpiderMonkey)	2024-07-25 21:13:35
3	Peter Menyes	194	JavaScript (SpiderMonkey)	2017-08-10 22:28:05
4	Knut Salomonsson	452	JavaScript (SpiderMonkey)	2016-11-01 10:42:02
5	Gabriel Lau	456	JavaScript (SpiderMonkey)	2016-03-24 02:05:49
6	Abdyrahman Ybytov	476	JavaScript (SpiderMonkey)	2025-02-03 22:39:40
7	J M	502	JavaScript (SpiderMonkey)	2016-10-06 20:26:27
8	Johannes Jensen	525	JavaScript (SpiderMonkey)	2016-03-05 16:26:48
9	Peter Kedemo	534	JavaScript (SpiderMonkey)	2015-12-17 23:47:21
10	Tor Nordqvist	541	JavaScript (SpiderMonkey)	2016-11-05 22:48:34

#	User	Length	Language	Date
1	Timothy Gaede	516	Julia	2024-04-28 08:38:08

#	User	Length	Language	Date
1	Johnny Baloney	548	Kotlin	2021-09-12 20:50:32
2	Sarek Høverstad Skotåm	582	Kotlin	2020-10-22 19:28:32
3	Dmitry Shostak	607	Kotlin	2018-06-20 19:10:31
4	Nicholas Johnson	635	Kotlin	2020-03-23 21:26:50
5	Dayan Ruben Gonzalez	639	Kotlin	2020-10-01 04:16:20
6	Troy Warmboe	678	Kotlin	2020-02-07 21:16:23
7	Yang Tang	716	Kotlin	2023-07-28 07:22:23
8	Adam Koprowski	725	Kotlin	2020-09-11 18:22:39
9	Jacob Huebner	777	Kotlin	2020-04-13 05:34:25
10	Henning Koehler	808	Kotlin	2018-11-02 05:32:11

#	User	Length	Language	Date
1	Shehab Ahmed Hatem	636	Lua	2023-12-04 16:29:49

#	User	Length	Language	Date
1	Yuanting Mao	679	OCaml	2023-08-02 22:51:38

#	User	Length	Language	Date
1	Mark Terwilliger	689	Pascal	2017-09-27 04:46:55
2	Hobert Ho	1470	Pascal	2022-07-22 11:54:48
3	Ingemar Ragnemalm	1504	Pascal	2017-12-18 11:25:30

#	User	Length	Language	Date
1	Denis BAURAIN	505	Perl	2025-12-29 13:15:18

#	User	Length	Language	Date
1	Silvena Lam	574	PHP	2016-02-06 17:34:40
2	Denis Alimov	638	PHP	2018-01-23 08:47:46
3	Renate	683	PHP	2021-05-11 00:11:17
4	Kamal Nayak	706	PHP	2020-03-09 22:03:08
5	Jonas Lindenskov Nielsen	717	PHP	2019-11-12 08:36:06
6	Steven D. Wilson	786	PHP	2016-03-26 02:16:06
7	Martin Dibakar Björling	900	PHP	2015-11-24 13:10:12
8	Mattéo Ladrat	972	PHP	2020-11-26 23:07:20
9	Alessandro Pasqualini	1032	PHP	2019-01-14 14:14:46
10	Krzys Hejno	1047	PHP	2025-04-03 06:25:59

#	User	Length	Language	Date
1	Hakan Kjellerstrand	589	Prolog	2023-02-04 21:03:48

#	User	Length	Language	Date
1	Thomas Feld	198	Python 2	2019-08-19 12:24:15
2	Ben Ao	238	Python 2	2016-11-10 16:07:48
3	Grant Ballard	247	Python 2	2019-01-16 21:59:31
4	Asger Hautop Drewsen	250	Python 2	2015-11-08 16:11:07
5	beagle dog	262	Python 2	2020-05-13 12:48:18
6	Tal Melamed	268	Python 2	2017-12-01 02:49:33
7	Hasan Ramezani	273	Python 2	2016-06-17 14:46:29
8	Karen Mkrtumyan	286	Python 2	2017-03-15 22:47:19
9	Hidden user	287	Python 2	2017-11-21 07:02:42
10	Matt Bonsall	288	Python 2	2016-10-20 16:49:10

#	User	Length	Language	Date
1	June Hoop	107	Python 3	2025-09-17 18:09:31
2	Benjamin Z White	116	Python 3	2023-04-22 14:35:26
3	Gustav Elmqvist	120	Python 3	2023-02-12 19:54:29
4	Kevin Gomez	120	Python 3	2023-09-05 20:47:57
5	Charles Ancheta	129	Python 3	2023-03-16 08:35:26
6	Adam Levav	138	Python 3	2023-01-24 22:40:35
7	Michael Goldwasser	143	Python 3	2024-08-22 05:36:49
8	Jeremy Eastham	146	Python 3	2025-01-17 00:19:50
9	Maxwell Penders	148	Python 3	2024-11-05 02:12:54
10	Spynder	153	Python 3	2023-08-20 17:13:05

#	User	Length	Language	Date
1	Jinwoo Lee	889	Racket	2025-02-01 21:26:12

#	User	Length	Language	Date
1	Thomas Feld	95	Ruby	2022-11-10 13:12:30
2	Alexander Bilde Pedersen	100	Ruby	2023-04-02 01:10:01
3	Russell Ng	104	Ruby	2025-05-24 23:17:32
4	Régis Hanol	180	Ruby	2022-01-11 15:22:15
5	Hidden user	206	Ruby	2019-02-16 22:08:06
6	Macdara mac an tSionnaigh	265	Ruby	2019-09-17 17:45:25
7	Paul Vinell	307	Ruby	2018-04-18 12:00:39
8	Casper Christensen	327	Ruby	2015-12-30 23:54:59
9	Kevin Suwala	331	Ruby	2017-01-08 21:58:31
10	Michael Go	354	Ruby	2024-05-26 18:53:52

#	User	Length	Language	Date
1	Vincent Lagerros	578	Rust	2025-01-24 18:57:06
2	Joost Scheffer	793	Rust	2021-04-19 09:03:40
3	Pankajkumar Patro	804	Rust	2024-12-09 01:02:31
4	Chaoyi Yin	815	Rust	2019-04-01 17:47:14
5	Hidden user	832	Rust	2024-06-30 18:06:09
6	Artur Khuziakhmetov	841	Rust	2022-07-07 20:51:01
7	Johan Larsson	843	Rust	2021-01-28 20:22:15
8	Kok Dith	881	Rust	2021-08-04 07:29:38
9	Hidden user	889	Rust	2025-12-30 19:35:04
10	Bas Dirks	898	Rust	2022-01-09 17:20:44

#	User	Length	Language	Date
1	Cyril Chaize	2606	TypeScript	2024-01-07 18:17:11

#	User	Length	Language	Date
1	Krishan Leong	781	Visual Basic	2024-02-20 23:28:10

#	User	Length	Language	Date
1	Joe Blower	1486	Zig	2025-05-22 21:12:26

Solution running time distribution