Problem A
Exam — Problem Statistics

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Submissions	7026
Accepted submissions	3478
Submission ratio	49.50%
Authors	3213
Full solves [?]	2922
Full solve Ratio	90.94%

#	User	Runtime	Language	Date
1	Thomas Feld	0.01 s	APL	2023-07-15 01:18:42

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.06 s	Bash	2023-09-30 19:11:34

#	User	Runtime	Language	Date
1	Anders Høy Seemann Vestergaard	0.02 s	C#	2018-12-12 16:47:50
2	Ron Harper	0.02 s	C#	2019-01-08 21:11:28
3	Eric Bäckhage	0.02 s	C#	2019-02-24 10:33:55
4	Timothy Colaneri	0.02 s	C#	2019-08-11 22:50:57
5	Alex Van Keulen	0.02 s	C#	2019-09-06 18:49:07
6	Travis Lange	0.02 s	C#	2019-09-27 15:53:08
7	Thomas Norris	0.02 s	C#	2019-10-03 21:44:35
8	Onur Kahveci	0.02 s	C#	2019-11-21 11:32:31
9	Gurpartap Singh Bhatti	0.02 s	C#	2020-03-31 04:39:51
10	Yuwono Bangun Nagoro	0.02 s	C#	2020-09-18 17:48:15

#	User	Runtime	Language	Date
1	Hugo Sansaqua	0.01 s	Common Lisp	2020-11-27 16:19:49
2	Alex Lewin	0.02 s	Common Lisp	2019-05-01 03:06:05

#	User	Runtime	Language	Date
1	Allan Kjær Nielsen	0.04 s	F#	2020-11-27 16:35:51
2	Jacob Harris Cryer Kragh	0.04 s	F#	2022-08-28 08:50:05

#	User	Runtime	Language	Date
1	Nischal Bhandari	0.00 s	Go	2025-05-16 22:58:12
2	Nathan Lee	0.00 s	Go	2025-09-04 23:07:46
3	Magix	0.08 s	Go	2020-09-17 20:54:00
4	Norbert Voelker	0.08 s	Go	2021-04-26 12:25:59
5	Krzysztof Gibuła	0.08 s	Go	2021-08-07 22:39:59

#	User	Runtime	Language	Date
1	Jan Hrček	0.00 s	Haskell	2019-05-13 20:54:00
2	Hidden user	0.00 s	Haskell	2019-08-22 19:35:17
3	Steven Fontanella	0.00 s	Haskell	2019-09-19 04:51:39
4	Hidden user	0.00 s	Haskell	2022-12-26 13:17:03
5	Daniel Brännvall	0.00 s	Haskell	2023-06-08 14:13:19
6	Steinar Simonnes	0.00 s	Haskell	2024-03-09 19:52:17
7	Gustav Kristensen	0.00 s	Haskell	2025-11-28 17:16:18
8	Håkon Flatval	0.01 s	Haskell	2018-11-30 06:32:11
9	Intrets	0.01 s	Haskell	2019-08-21 12:55:43
10	Aurélien Pepin	0.01 s	Haskell	2019-09-07 12:14:31

#	User	Runtime	Language	Date
1	Taras Romanyuk	0.04 s	Java	2024-10-23 14:39:44
2	Thanh Nhan Nguyen	0.04 s	Java	2024-11-12 22:20:29
3	Phuc Tan Hien Tran	0.04 s	Java	2024-11-18 23:22:29
4	Thanh Le Binh	0.04 s	Java	2024-11-19 11:11:51
5	James H. Tran	0.04 s	Java	2024-11-19 14:07:37
6	Anvitha Shesh	0.04 s	Java	2024-11-19 15:36:03
7	Guangyi Zhou	0.04 s	Java	2025-02-20 08:01:48
8	Hidden user	0.04 s	Java	2025-04-17 19:54:43
9	Hidden user	0.04 s	Java	2025-04-17 20:13:21
10	Hieu Le	0.05 s	Java	2018-11-03 19:03:56

#	User	Runtime	Language	Date
1	Hidden user	0.04 s	JavaScript (Node.js)	2025-02-02 16:18:24
2	Peter Kedemo	0.42 s	JavaScript (Node.js)	2020-01-06 01:45:02
3	Hidden user	0.42 s	JavaScript (Node.js)	2020-12-29 03:37:30
4	Chris Wong	0.42 s	JavaScript (Node.js)	2021-03-09 23:16:36
5	Howard Tin Chi Chan	0.42 s	JavaScript (Node.js)	2021-03-13 09:15:40
6	Niamh Limerick	0.42 s	JavaScript (Node.js)	2022-02-14 10:40:02
7	Andoko Chandra	0.43 s	JavaScript (Node.js)	2020-10-20 15:25:49

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.02 s	JavaScript (SpiderMonkey)	2018-11-04 11:21:59
2	Zachary DeStefano	0.02 s	JavaScript (SpiderMonkey)	2019-10-13 01:30:44
3	Peter Menyes	0.02 s	JavaScript (SpiderMonkey)	2021-08-29 13:55:12
4	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2022-06-07 17:36:28
5	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-15 10:49:19

#	User	Runtime	Language	Date
1	Timothy Gaede	0.56 s	Julia	2024-04-23 08:08:38

#	User	Runtime	Language	Date
1	Kiel Dowdle	0.13 s	Kotlin	2021-03-30 05:31:26
2	Hidden user	0.14 s	Kotlin	2019-12-05 20:42:11
3	Jacob Huebner	0.14 s	Kotlin	2020-02-24 10:36:27
4	Marit van Dijk	0.15 s	Kotlin	2021-09-17 09:28:04
5	Matthew Swanson	0.16 s	Kotlin	2022-10-19 03:51:39
6	Adam Rankin	0.16 s	Kotlin	2023-05-09 06:31:55
7	Ellis Tsung	0.18 s	Kotlin	2018-11-08 02:53:37
8	Ola Sundell	0.18 s	Kotlin	2019-08-21 12:01:05
9	Neil Harmon	0.19 s	Kotlin	2019-04-29 16:01:59
10	Hidden user	0.19 s	Kotlin	2021-07-02 16:13:25

#	User	Runtime	Language	Date
1	Erik K	0.00 s	OCaml	2021-01-21 09:08:05

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2018-11-06 17:22:20

#	User	Runtime	Language	Date
1	Renate	0.01 s	PHP	2022-08-14 17:46:40

#	User	Runtime	Language	Date
1	Hakan Kjellerstrand	0.02 s	Prolog	2023-02-14 09:01:31
2	Andriy Zyevakov	0.06 s	Prolog	2018-11-14 21:36:19

#	User	Runtime	Language	Date
1	Jesper Öqvist	0.03 s	Python 2	2018-11-04 13:39:18
2	Ethan Arnold	0.03 s	Python 2	2018-11-04 22:51:19
3	Max Holmberg	0.03 s	Python 2	2018-11-05 21:56:13
4	Johann Ly	0.03 s	Python 2	2018-11-06 08:36:41
5	Klas af Geijerstam	0.03 s	Python 2	2018-11-06 17:20:47
6	Lars Åström	0.03 s	Python 2	2018-11-08 00:26:17
7	Jerry Li	0.03 s	Python 2	2018-11-10 04:50:57
8	Henry Xia	0.03 s	Python 2	2018-11-18 12:10:18
9	Maj Stenmark	0.03 s	Python 2	2018-11-20 22:41:26
10	Måns Magnusson	0.03 s	Python 2	2018-12-02 19:18:47

#	User	Runtime	Language	Date
1	Craigory Coppola	0.02 s	Python 3	2018-11-04 02:57:47
2	Jared Gillespie	0.02 s	Python 3	2018-11-04 14:23:17
3	Joseph-Anthony Hardin	0.02 s	Python 3	2018-11-04 18:13:12
4	Kasra Ghodsi	0.02 s	Python 3	2018-11-04 20:06:12
5	Jacob Raymond	0.02 s	Python 3	2018-11-05 02:44:38
6	Bjørn Dons	0.02 s	Python 3	2018-11-05 02:48:33
7	Ram Basnet	0.02 s	Python 3	2018-11-05 06:24:14
8	Christofer Ohlsson	0.02 s	Python 3	2018-11-05 11:19:54
9	Arnav Sastry	0.02 s	Python 3	2018-11-05 13:19:55
10	Iqrar Agalosi Nureyza	0.02 s	Python 3	2018-11-05 14:10:24

#	User	Runtime	Language	Date
1	Miorel Palii	0.04 s	Ruby	2018-11-03 23:10:12
2	Donald Dong	0.04 s	Ruby	2018-12-30 06:16:17
3	Yusuke Ichiki	0.05 s	Ruby	2022-06-10 17:22:47
4	Thomas Feld	0.06 s	Ruby	2023-01-11 14:10:20
5	Chenzhang Hu	0.06 s	Ruby	2024-10-07 12:09:33
6	HuaiYuan Jing	0.07 s	Ruby	2024-02-25 21:51:25
7	Frederik Petersen	0.29 s	Ruby	2025-03-28 13:15:26

#	User	Length	Language	Date
1	Thomas Feld	33	APL	2023-07-15 01:34:36

#	User	Length	Language	Date
1	Chenzhang Hu	62	Bash	2025-09-13 02:16:52

#	User	Length	Language	Date
1	Johan Larsson	289	C	2022-06-08 02:44:11
2	Magnus Wass	353	C	2020-03-17 02:46:55
3	Cal Nolan	360	C	2019-11-17 05:07:38
4	Allan Nouri	384	C	2024-05-07 16:30:21
5	Mirel Cosulschi	405	C	2024-11-01 23:05:44
6	Yogindra Addanki	409	C	2020-04-01 14:23:08
7	Nihat Altiparmak	417	C	2018-11-03 22:16:11
8	James Rettie	428	C	2022-10-25 07:54:25
9	April Clark	430	C	2021-10-06 23:31:59
10	Caleb Kraglund	430	C	2025-09-27 19:52:06

#	User	Length	Language	Date
1	Esty Crow	385	C#	2023-03-24 04:20:13
2	Anthony Ye	435	C#	2023-03-26 18:18:44
3	Nicke Nyfiken	557	C#	2025-03-21 11:32:19
4	Hidden user	564	C#	2022-06-11 15:25:54
5	Գոռ Բաղդասարյան	639	C#	2025-02-13 16:48:53
6	Alex Van Keulen	661	C#	2019-09-06 18:49:07
7	Onur Kahveci	680	C#	2019-11-21 11:32:31
8	Matthew Willacy	700	C#	2021-02-10 22:02:42
9	Eric Weiss	702	C#	2022-08-12 22:39:17
10	Anders Parsberg Wagner	749	C#	2020-10-07 15:26:16

#	User	Length	Language	Date
1	Jiahui Lu	227	C++	2018-11-09 00:43:37
2	Marco Servin	231	C++	2020-07-01 00:07:06
3	Đậu Huy Minh	234	C++	2023-11-04 12:44:11
4	Aryo Aji Wibisono	237	C++	2023-03-14 08:48:45
5	Yeung Man Tsung	242	C++	2023-01-16 13:03:21
6	Bobby Cai Rong	244	C++	2019-01-28 16:41:01
7	Hidden user	245	C++	2020-03-02 02:58:04
8	Way Tan	246	C++	2018-11-19 15:52:06
9	Ayman Zaidane	248	C++	2025-12-05 20:21:15
10	Manuel Alejandro Rodriguez Rivera	250	C++	2021-11-16 11:25:29

#	User	Length	Language	Date
1	Alex Lewin	649	Common Lisp	2019-05-01 03:06:05
2	Hugo Sansaqua	2995	Common Lisp	2020-11-27 16:19:49

#	User	Length	Language	Date
1	Allan Kjær Nielsen	392	F#	2020-11-27 16:35:51
2	Jacob Harris Cryer Kragh	956	F#	2022-08-28 08:50:05

#	User	Length	Language	Date
1	Nischal Bhandari	401	Go	2025-05-16 22:58:12
2	Nathan Lee	668	Go	2025-09-04 23:07:46
3	Krzysztof Gibuła	771	Go	2021-08-07 22:39:59
4	Norbert Voelker	834	Go	2021-04-26 12:25:59
5	Magix	1255	Go	2020-09-17 20:54:00

#	User	Length	Language	Date
1	Steinar Simonnes	176	Haskell	2024-03-09 19:52:17
2	Hidden user	312	Haskell	2022-12-26 13:17:03
3	Håkon Flatval	354	Haskell	2018-11-30 06:32:11
4	Gustav Kristensen	392	Haskell	2025-11-28 17:16:18
5	Anders Aarsæther	446	Haskell	2021-11-08 16:04:42
6	Steven Fontanella	448	Haskell	2019-09-19 04:51:39
7	Hidden user	488	Haskell	2019-08-22 19:35:17
8	Jan Hrček	530	Haskell	2019-05-13 20:54:00
9	Daniel Brännvall	542	Haskell	2023-06-08 14:13:19
10	Aurélien Pepin	606	Haskell	2019-09-07 12:14:31

#	User	Length	Language	Date
1	Prakash Sanyasi	394	Java	2018-12-06 20:38:31
2	Kevin Kauffman	404	Java	2022-01-03 05:59:36
3	Duncan Page	413	Java	2019-02-18 23:34:10
4	BluefrumS	421	Java	2020-01-23 22:42:31
5	Calvin Godfrey	426	Java	2019-10-12 19:23:32
6	Frank Ruskey	429	Java	2018-11-13 01:54:50
7	Echouri Yassine	434	Java	2020-02-02 16:29:10
8	Thomas	446	Java	2020-01-23 22:42:24
9	tonycuba	450	Java	2023-01-22 02:53:21
10	Ruhan Goltay	456	Java	2021-11-17 15:16:45

#	User	Length	Language	Date
1	Peter Kedemo	573	JavaScript (Node.js)	2020-01-06 01:45:02
2	Howard Tin Chi Chan	656	JavaScript (Node.js)	2021-03-13 09:15:40
3	Chris Wong	689	JavaScript (Node.js)	2021-03-09 23:16:36
4	Niamh Limerick	984	JavaScript (Node.js)	2022-02-14 10:40:02
5	Andoko Chandra	1024	JavaScript (Node.js)	2020-10-20 15:25:49
6	Hidden user	1218	JavaScript (Node.js)	2020-12-29 03:37:30
7	Hidden user	1222	JavaScript (Node.js)	2025-02-02 16:18:24

#	User	Length	Language	Date
1	Jimmy Gustafsson	164	JavaScript (SpiderMonkey)	2022-06-07 17:36:28
2	Bjørn Chr. Soltvedt	238	JavaScript (SpiderMonkey)	2018-11-04 11:21:59
3	Christian Pilegaard Cederquist	332	JavaScript (SpiderMonkey)	2023-01-15 10:49:19
4	Zachary DeStefano	349	JavaScript (SpiderMonkey)	2019-10-13 01:30:44
5	Peter Menyes	365	JavaScript (SpiderMonkey)	2021-08-29 13:55:12

#	User	Length	Language	Date
1	Timothy Gaede	441	Julia	2024-04-23 08:08:38

#	User	Length	Language	Date
1	Ellis Tsung	328	Kotlin	2018-11-08 02:53:37
2	Benjamin Laurence Erickson	331	Kotlin	2018-12-24 16:59:12
3	Phường Lên	336	Kotlin	2019-12-30 06:17:38
4	Ali M. Nekoh	340	Kotlin	2025-06-05 11:56:05
5	Matthew Swanson	403	Kotlin	2022-10-19 03:51:39
6	Adam Rankin	571	Kotlin	2023-05-09 06:31:55
7	Marit van Dijk	583	Kotlin	2021-09-17 09:28:04
8	Troy Warmboe	586	Kotlin	2020-02-14 23:07:16
9	Hidden user	611	Kotlin	2019-12-05 20:42:11
10	Jacob Huebner	712	Kotlin	2020-02-24 10:36:27

#	User	Length	Language	Date
1	Erik K	440	OCaml	2021-01-22 02:44:02

#	User	Length	Language	Date
1	Ingemar Ragnemalm	496	Pascal	2018-11-06 17:22:20

#	User	Length	Language	Date
1	Renate	453	PHP	2022-08-14 17:46:40

#	User	Length	Language	Date
1	Hakan Kjellerstrand	484	Prolog	2023-02-14 09:01:31
2	Andriy Zyevakov	862	Prolog	2018-11-14 21:36:19

#	User	Length	Language	Date
1	Justin Su	135	Python 2	2019-10-01 02:50:25
2	Thomas Feld	139	Python 2	2019-09-02 13:49:13
3	Johan Lyts	156	Python 2	2019-07-13 14:10:07
4	Andreas Björklund	164	Python 2	2021-04-02 09:36:28
5	Ethan Arnold	165	Python 2	2018-11-04 22:51:19
6	Abdulselam Hassen	167	Python 2	2019-11-14 10:37:57
7	Henry Xia	169	Python 2	2018-11-18 12:10:18
8	Måns Magnusson	180	Python 2	2018-12-02 19:18:47
9	Jonatan Nilsson	188	Python 2	2019-05-12 12:30:00
10	Maj Stenmark	193	Python 2	2018-11-20 22:41:26

#	User	Length	Language	Date
1	Simon Hellsten	66	Python 3	2023-07-08 16:20:58
2	Clement Oh	68	Python 3	2023-07-14 18:33:36
3	Michael Goldwasser	76	Python 3	2024-03-23 19:09:31
4	Andrew Tapia	76	Python 3	2024-10-11 09:58:45
5	Shashank Bhatt	77	Python 3	2024-10-13 01:26:26
6	David Allemang	78	Python 3	2020-01-22 01:04:29
7	Michael Laurila	79	Python 3	2023-06-08 13:38:18
8	Josh Henderson	79	Python 3	2023-09-04 21:20:05
9	Isak Nyberg	83	Python 3	2023-06-05 18:59:29
10	Benjamin Z White	85	Python 3	2023-04-25 16:40:10

#	User	Length	Language	Date
1	Chenzhang Hu	61	Ruby	2024-10-07 12:09:33
2	Thomas Feld	68	Ruby	2023-01-11 14:22:45
3	Donald Dong	203	Ruby	2018-12-30 06:16:17
4	Miorel Palii	248	Ruby	2018-11-03 23:10:12
5	Yusuke Ichiki	250	Ruby	2022-06-10 17:22:47
6	HuaiYuan Jing	294	Ruby	2024-02-25 21:51:25
7	Frederik Petersen	681	Ruby	2025-03-28 13:15:26

#	User	Length	Language	Date
1	Vincent Lagerros	494	Rust	2025-01-29 20:58:59
2	Pankajkumar Patro	528	Rust	2025-02-22 17:03:13
3	Noah Weninger	654	Rust	2018-11-07 05:26:39
4	Adam Gausmann	672	Rust	2019-09-20 22:25:31
5	Kok Dith	682	Rust	2021-08-17 09:16:31
6	Isak Jägberg	734	Rust	2023-04-21 14:29:20
7	Malthe Mathias Mølgaard Larsen	764	Rust	2023-03-30 11:12:04
8	Thomas Hügel	804	Rust	2021-01-02 10:49:02
9	Freek van Keulen	817	Rust	2021-07-29 10:05:58
10	Thomas Charton-Jaeg	857	Rust	2024-04-04 12:04:22

Solution running time distribution