Problem A
Opening Ceremony — Problem Statistics

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Submissions	8637
Accepted submissions	2594
Submission ratio	30.03%
Authors	2408
Full solves [?]	2018
Full solve Ratio	83.80%

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.00 s	C	2023-01-30 11:56:10
2	Eyleifur Bjarkason	0.00 s	C	2023-01-30 21:04:06
3	Hidden user	0.00 s	C	2026-03-09 02:12:46
4	Garðar Ingvarsson	0.01 s	C	2019-02-24 17:11:13
5	Shuchi Zhang	0.01 s	C	2019-10-14 12:38:05
6	Sanjiv Dinakar	0.01 s	C	2024-01-17 17:22:29
7	Jeroen Bransen	0.02 s	C	2014-10-06 11:19:59
8	Erik Månsson	0.02 s	C	2014-12-08 02:45:19
9	Jonas Kylling	0.02 s	C	2014-12-13 18:51:15
10	Zining Zhu	0.02 s	C	2015-03-14 22:50:45

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.05 s	C#	2016-10-27 20:04:54
2	Bas te Kolste	0.06 s	C#	2014-10-04 14:53:50
3	masosz	0.06 s	C#	2015-03-16 19:55:20
4	Ivan Joukov	0.06 s	C#	2015-10-03 03:32:34
5	Raul Kooter	0.06 s	C#	2016-12-12 20:15:01
6	traxex	0.06 s	C#	2024-05-06 18:15:16
7	Ayk Stepanyan	0.07 s	C#	2014-10-05 19:49:49
8	Nathan Andrews	0.07 s	C#	2024-09-06 23:46:00
9	Farbror Bieber	0.08 s	C#	2014-10-04 19:27:52
10	Elias Böök	0.08 s	C#	2020-02-02 13:35:00

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	C++	2026-03-09 02:13:25
2	Andrei Bogdan Antonescu	0.01 s	C++	2014-10-04 11:17:36
3	Johan Sannemo	0.01 s	C++	2014-11-25 14:34:02
4	Paul Khadim	0.01 s	C++	2014-12-03 22:53:17
5	Mijia Jiang	0.01 s	C++	2015-03-14 18:25:23
6	Ragnar Groot Koerkamp	0.01 s	C++	2015-03-14 19:20:20
7	David Wärn	0.01 s	C++	2015-05-25 14:19:42
8	Kelly Milla	0.01 s	C++	2015-08-29 10:56:48
9	Hannes Bredberg	0.01 s	C++	2016-03-06 20:16:12
10	Hidden user	0.01 s	C++	2016-11-17 22:40:52

#	User	Runtime	Language	Date
1	Nathan Lee	0.03 s	Go	2025-09-20 16:43:11
2	Norbert Voelker	0.10 s	Go	2022-02-20 21:14:15
3	Fei Dong	0.10 s	Go	2022-09-20 15:09:35

#	User	Runtime	Language	Date
1	Hidden user	0.02 s	Haskell	2026-03-09 02:15:41
2	Steinar Simonnes	0.14 s	Haskell	2025-09-19 16:45:48
3	Brent Yorgey	0.32 s	Haskell	2017-10-17 04:20:33
4	Alessandro Bruni	0.33 s	Haskell	2019-04-13 17:46:07
5	Jørn Lode	0.33 s	Haskell	2022-09-28 20:52:00
6	grabarz	0.34 s	Haskell	2015-08-25 20:42:03
7	Johan Meier	0.34 s	Haskell	2016-12-26 13:14:39
8	Matthew A Johnson	0.34 s	Haskell	2017-01-05 08:29:22
9	Esther Chong	0.34 s	Haskell	2017-11-17 12:56:50
10	David Zacek	0.34 s	Haskell	2021-05-11 14:53:51

#	User	Runtime	Language	Date
1	Nguyễn Hùng Cường	0.07 s	Java	2018-10-08 11:03:00
2	Fynn Rocholl	0.07 s	Java	2025-09-11 13:21:39
3	Jack Fang	0.08 s	Java	2024-09-03 23:36:24
4	Øyvind Johannessen	0.10 s	Java	2018-11-17 22:38:31
5	Jan Štola	0.11 s	Java	2015-04-01 23:24:02
6	Khánh Nguyễn Tiến	0.11 s	Java	2018-10-06 09:02:25
7	Winston Cheung	0.12 s	Java	2017-01-07 00:24:15
8	Đức Phạm Hoài	0.12 s	Java	2018-10-11 10:58:18
9	Leon Wang	0.12 s	Java	2024-09-04 05:36:54
10	Samuel Klingström	0.13 s	Java	2017-06-09 20:24:23

#	User	Runtime	Language	Date
1	ET的實況轉播	0.11 s	JavaScript (Node.js)	2026-03-03 18:57:41
2	Stephanie Keck	0.59 s	JavaScript (Node.js)	2020-02-23 00:38:29

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.04 s	JavaScript (SpiderMonkey)	2016-11-02 22:59:56
2	Christian Pilegaard Cederquist	0.05 s	JavaScript (SpiderMonkey)	2023-05-29 01:07:03

#	User	Runtime	Language	Date
1	Timothy Gaede	0.41 s	Julia	2026-03-09 07:39:40
2	Hidden user	0.44 s	Julia	2025-04-23 07:08:46

#	User	Runtime	Language	Date
1	Benjamin Laurence Erickson	0.43 s	Kotlin	2018-07-20 21:42:09
2	Jacob Huebner	0.47 s	Kotlin	2020-04-21 00:07:27
3	Aksel Holbek Sørbye	0.48 s	Kotlin	2022-10-01 16:22:58
4	Hidden user	0.50 s	Kotlin	2019-12-14 18:35:34
5	Sergey Jakobsen	0.53 s	Kotlin	2022-01-19 18:17:28
6	Phường Lên	0.56 s	Kotlin	2019-12-13 23:42:02
7	Min-Zheng Shieh	0.56 s	Kotlin	2021-03-05 07:01:07
8	0812268崇晉	0.56 s	Kotlin	2022-04-14 18:57:18
9	Adam Rankin	0.64 s	Kotlin	2023-09-13 02:29:10

#	User	Runtime	Language	Date
1	Caleb Austin	0.09 s	Lua	2024-09-07 00:01:15

#	User	Runtime	Language	Date
1	Ishpreet Singh Bhasin	0.07 s	OCaml	2026-01-12 16:49:18

#	User	Runtime	Language	Date
1	Magnus Hagmar	0.05 s	Python 2	2014-10-04 13:25:53
2	Hidden user	0.05 s	Python 2	2014-10-04 14:40:13
3	Hidden user	0.05 s	Python 2	2014-10-04 23:15:35
4	Seb Nord	0.05 s	Python 2	2014-10-05 14:03:27
5	Tore Norderud	0.05 s	Python 2	2014-12-16 23:42:20
6	Christofer Ohlsson	0.05 s	Python 2	2015-03-30 22:33:56
7	Hidden user	0.05 s	Python 2	2015-04-26 19:01:13
8	Frederik Højholt	0.05 s	Python 2	2015-10-25 16:16:11
9	Daniel Moyer	0.05 s	Python 2	2016-11-10 04:31:49
10	Ethan Partidas	0.05 s	Python 2	2016-11-26 21:17:37

#	User	Runtime	Language	Date
1	Hidden user	0.06 s	Python 3	2025-02-03 03:37:43
2	Hidden user	0.06 s	Python 3	2026-03-09 02:03:30
3	Markus Thomsen	0.07 s	Python 3	2019-04-12 16:04:09
4	Riko Jacob	0.07 s	Python 3	2019-04-15 12:21:43
5	Nguyên Vương	0.07 s	Python 3	2019-08-07 17:12:03
6	Alex Lewin	0.07 s	Python 3	2019-10-08 22:13:20
7	Sam Westigard	0.07 s	Python 3	2019-10-10 01:43:47
8	Thomas Vu	0.07 s	Python 3	2019-10-24 05:21:40
9	Henry Stoldt	0.07 s	Python 3	2019-10-26 19:48:01
10	Devioun Foskett	0.07 s	Python 3	2019-11-04 22:43:17

#	User	Runtime	Language	Date
1	Erik Rydbert	0.07 s	Ruby	2016-08-02 13:19:18
2	Hidden user	0.09 s	Ruby	2019-03-04 15:35:34
3	Thomas Marlowe	0.10 s	Ruby	2024-09-11 01:10:40
4	Thomas Feld	0.12 s	Ruby	2023-02-13 13:50:19

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2024-09-17 17:18:44
2	Michael Vesterli	0.01 s	Rust	2019-04-12 16:18:28
3	Peter Hrvola	0.01 s	Rust	2019-04-12 17:33:08
4	Klas af Geijerstam	0.01 s	Rust	2020-10-19 16:22:36
5	Eric Pinter	0.01 s	Rust	2022-05-07 18:49:16
6	Bas Dirks	0.01 s	Rust	2022-05-28 14:15:21
7	Zane Johnson	0.01 s	Rust	2022-09-27 21:34:29
8	Niklas Sandén	0.01 s	Rust	2022-09-29 19:03:30
9	Egor Kulikov	0.01 s	Rust	2025-02-05 12:15:04
10	Joe Blower	0.01 s	Rust	2025-12-02 02:14:52

#	User	Length	Language	Date
1	Ivan Petrov	419	C	2019-05-31 12:53:09
2	Jeroen Bransen	471	C	2014-10-06 11:19:59
3	Erik Månsson	474	C	2014-12-08 02:50:07
4	Jonas Kylling	489	C	2014-12-13 18:51:15
5	Mirel Cosulschi	501	C	2025-03-25 21:43:18
6	ren hao	520	C	2023-03-04 10:09:31
7	Eric McKnight	567	C	2017-10-24 05:07:17
8	Daiqi Wu	569	C	2018-10-18 13:36:59
9	Hidden user	629	C	2020-06-25 11:13:56
10	Bryan Heryanto	820	C	2019-09-26 17:04:23

#	User	Length	Language	Date
1	traxex	302	C#	2024-05-06 18:15:16
2	Nathan Andrews	496	C#	2024-09-06 23:46:00
3	Brian Scott	621	C#	2018-09-13 22:05:07
4	Raul Kooter	1006	C#	2016-12-12 20:15:01
5	Bas te Kolste	1103	C#	2014-10-04 14:53:50
6	Farbror Bieber	1247	C#	2014-10-04 19:27:52
7	masosz	1251	C#	2015-03-16 19:55:20
8	Holger Borum	1343	C#	2019-04-14 11:24:16
9	Elias Böök	1471	C#	2020-02-02 13:35:00
10	Marit Hellestø	1739	C#	2018-08-22 20:29:43

#	User	Length	Language	Date
1	Zane Yu	233	C++	2019-02-03 15:32:43
2	Yui Huang	248	C++	2023-03-03 13:16:29
3	Elias Lolck	250	C++	2023-01-03 11:58:45
4	蘇智海	253	C++	2022-03-04 12:46:34
5	William Gan	258	C++	2017-08-12 17:46:47
6	Matteo Canton	266	C++	2023-12-08 09:27:55
7	Leonardo Lima	266	C++	2024-04-25 16:35:18
8	Camila Maeda Shida	271	C++	2022-06-29 22:04:03
9	Jannik Olbrich	274	C++	2019-07-07 14:21:24
10	Paweł Burzyński	276	C++	2018-10-17 17:43:38

#	User	Length	Language	Date
1	Nathan Lee	641	Go	2025-09-20 16:43:11
2	Norbert Voelker	673	Go	2022-02-20 21:14:15
3	Fei Dong	1396	Go	2022-09-20 15:09:35

#	User	Length	Language	Date
1	Jørn Lode	193	Haskell	2022-09-28 20:54:24
2	Brent Yorgey	306	Haskell	2017-10-17 04:20:33
3	Lukas Polacek	307	Haskell	2015-07-09 21:01:37
4	Esther Chong	391	Haskell	2017-11-17 12:56:50
5	Matthew A Johnson	474	Haskell	2017-01-05 08:29:22
6	grabarz	483	Haskell	2015-08-25 20:42:03
7	Alessandro Bruni	537	Haskell	2019-04-13 17:46:07
8	David Zacek	625	Haskell	2021-05-11 14:52:15
9	Johan Meier	763	Haskell	2016-12-26 13:14:39
10	Steinar Simonnes	1064	Haskell	2025-09-19 16:45:48

#	User	Length	Language	Date
1	Hidden user	387	Java	2023-10-18 01:10:35
2	John Edwards	394	Java	2019-02-08 23:15:56
3	Hidden user	402	Java	2014-10-04 11:22:56
4	Brennan Cleland	414	Java	2023-05-24 20:25:34
5	Nam Phan Thành	420	Java	2018-10-10 10:21:45
6	Måns Magnusson	428	Java	2016-03-08 23:49:44
7	Hidden user	430	Java	2019-01-29 04:24:20
8	Hidden user	445	Java	2015-06-14 16:12:25
9	Qritel Abdelilah	448	Java	2018-05-03 16:29:09
10	Steve Tate	457	Java	2020-03-27 15:05:06

#	User	Length	Language	Date
1	ET的實況轉播	967	JavaScript (Node.js)	2026-03-03 18:57:41
2	Stephanie Keck	8334	JavaScript (Node.js)	2020-02-23 00:38:29

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	385	JavaScript (SpiderMonkey)	2023-05-29 01:07:03
2	Bjørn Chr. Soltvedt	575	JavaScript (SpiderMonkey)	2016-11-02 22:59:56

#	User	Length	Language	Date
1	Timothy Gaede	306	Julia	2026-03-09 07:39:40
2	Hidden user	356	Julia	2025-04-23 07:08:46

#	User	Length	Language	Date
1	Min-Zheng Shieh	244	Kotlin	2021-03-05 07:01:07
2	0812268崇晉	253	Kotlin	2022-04-14 18:57:18
3	Sergey Jakobsen	332	Kotlin	2022-01-19 18:17:28
4	Aksel Holbek Sørbye	368	Kotlin	2022-10-01 16:35:14
5	Jacob Huebner	397	Kotlin	2020-04-21 00:07:27
6	Adam Rankin	447	Kotlin	2023-09-13 02:29:10
7	Benjamin Laurence Erickson	456	Kotlin	2018-07-20 21:42:09
8	Phường Lên	478	Kotlin	2019-12-13 23:42:02
9	Hidden user	1607	Kotlin	2019-12-14 18:35:34

#	User	Length	Language	Date
1	Caleb Austin	609	Lua	2024-09-07 00:01:15

#	User	Length	Language	Date
1	Ishpreet Singh Bhasin	251	OCaml	2026-01-13 06:59:51

#	User	Length	Language	Date
1	Hidden user	109	Python 2	2014-10-06 12:29:46
2	Eoin Davey	132	Python 2	2017-10-18 00:54:40
3	Guan Yang Ze	141	Python 2	2019-10-22 05:46:04
4	Thomas Feld	141	Python 2	2020-06-23 10:09:07
5	Andreas Björklund	148	Python 2	2019-04-12 17:58:58
6	Ethan Arnold	155	Python 2	2017-01-09 07:51:21
7	Michael Huang	156	Python 2	2018-03-23 01:02:41
8	Viktor Bello Thomsen	181	Python 2	2019-11-21 01:41:12
9	Thomas Vu	195	Python 2	2019-10-24 05:22:53
10	Hidden user	221	Python 2	2014-10-04 23:15:35

#	User	Length	Language	Date
1	Clement Oh	80	Python 3	2023-05-31 14:07:08
2	Sander Oppen	91	Python 3	2024-09-29 15:17:17
3	Benjamin Z White	92	Python 3	2023-05-16 11:10:12
4	Pedro Sugiyama	94	Python 3	2024-09-13 03:25:33
5	Varun Asuri	94	Python 3	2024-09-13 03:26:09
6	Peter Stauder	96	Python 3	2023-03-04 21:02:07
7	Ahmed Chamseddine	96	Python 3	2025-08-27 00:54:32
8	Lennart Meyling	100	Python 3	2024-08-12 22:49:59
9	Si Jie Tan	100	Python 3	2026-01-11 02:27:31
10	Hidden user	101	Python 3	2024-02-14 15:12:48

#	User	Length	Language	Date
1	Thomas Feld	55	Ruby	2023-02-13 13:50:19
2	Thomas Marlowe	62	Ruby	2024-09-11 01:10:40
3	Hidden user	168	Ruby	2019-03-04 15:34:33
4	Erik Rydbert	922	Ruby	2016-08-02 13:19:18

#	User	Length	Language	Date
1	Bas Dirks	492	Rust	2022-05-28 14:16:31
2	Peter Hrvola	535	Rust	2019-04-12 17:33:08
3	Michael Vesterli	665	Rust	2019-04-12 16:18:28
4	Zane Johnson	726	Rust	2022-09-27 21:34:29
5	Valdimar Örn	809	Rust	2023-02-07 12:45:44
6	Alessandro Bruni	950	Rust	2019-04-13 12:54:05
7	Mckinley Xie	1101	Rust	2025-01-31 22:52:30
8	許哲瑋	1423	Rust	2024-03-14 10:35:35
9	Eric Pinter	1613	Rust	2022-05-07 18:49:16
10	Joe Blower	1894	Rust	2025-12-02 02:14:52

Solution running time distribution