Problem A
Piano Lessons — Problem Statistics

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Submissions	1643
Accepted submissions	713
Submission ratio	43.40%
Authors	541
Accepted authors	464
Author ratio	85.77%

#	User	Runtime	Language	Date
1	Ivan Petrov	0.06 s	C	2019-03-22 09:24:38
2	Hidden user	0.76 s	C	2025-06-06 18:26:04

#	User	Runtime	Language	Date
1	jhoan marcos condori humeres	0.80 s	C#	2024-11-18 04:32:26

#	User	Runtime	Language	Date
1	Constantijn Dekker	0.01 s	C++	2021-03-13 15:08:15
2	Alper Tuzcu	0.01 s	C++	2022-10-07 01:42:00
3	Isaac Arvestad	0.04 s	C++	2019-04-08 19:38:37
4	Tyler Marks	0.04 s	C++	2022-02-19 22:54:20
5	Henry Xia	0.04 s	C++	2022-05-15 07:08:48
6	Luke Videckis	0.04 s	C++	2022-05-28 20:50:27
7	Lucas Turci	0.05 s	C++	2019-03-16 17:49:34
8	Wesley Leung	0.05 s	C++	2019-03-16 17:51:00
9	Sean Purcell	0.05 s	C++	2019-03-16 17:59:48
10	Rodrigo Weigert	0.05 s	C++	2019-03-16 18:16:11

#	User	Runtime	Language	Date
1	Lim Yong Shen, Kevin	0.31 s	Java	2022-04-30 07:58:59
2	Danny Mittal	0.33 s	Java	2022-09-21 01:59:37
3	William Quiroga	0.46 s	Java	2019-03-19 19:46:06
4	Jacob Magnuson	0.48 s	Java	2019-03-19 03:07:04
5	Arup Ratan Guha	0.57 s	Java	2019-03-18 05:04:59
6	Max Bagatini Alves	0.60 s	Java	2022-02-24 21:06:06
7	Godmar Back	0.64 s	Java	2021-10-07 19:47:37
8	Benjamin Reidys	0.68 s	Java	2019-03-16 23:49:22
9	Thomas King	0.70 s	Java	2020-08-02 03:34:49
10	Micah Stairs	0.74 s	Java	2019-03-17 17:19:07

#	User	Runtime	Language	Date
1	Christian Cederquist	1.20 s	JavaScript (SpiderMonkey)	2023-08-09 23:40:07
2	Bjørn Chr. Soltvedt	5.20 s	JavaScript (SpiderMonkey)	2019-03-17 23:13:54

#	User	Runtime	Language	Date
1	Noszály Csaba	0.64 s	Julia	2025-03-22 19:45:20

#	User	Runtime	Language	Date
1	Phường Lên	0.82 s	Kotlin	2020-07-19 21:19:05

#	User	Runtime	Language	Date
1	Chik Cheng Yao	0.76 s	OCaml	2019-10-22 20:23:53

#	User	Runtime	Language	Date
1	Andreas Björklund	0.13 s	Python 2	2019-06-27 18:35:36

#	User	Runtime	Language	Date
1	Cole Dewis	0.10 s	Python 3	2023-11-17 17:47:27
2	Carlin Boyles	0.10 s	Python 3	2023-11-22 05:38:19
3	Hidden user	0.10 s	Python 3	2023-12-08 08:09:03
4	Hidden user	0.11 s	Python 3	2022-11-30 03:23:22
5	Ahmad Amali	0.11 s	Python 3	2022-12-04 22:40:06
6	Jeremiah Daniel Regalario	0.11 s	Python 3	2025-06-13 19:46:22
7	Ashwin Shreekumar	0.12 s	Python 3	2023-11-16 03:16:54
8	Weiguo Jiang	0.12 s	Python 3	2023-11-17 00:34:02
9	Anya Hanatuke	0.12 s	Python 3	2023-11-24 20:05:18
10	Bayley Sapara	0.12 s	Python 3	2023-12-01 19:49:26

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.01 s	Rust	2025-03-16 00:55:06
2	Constantijn Dekker	0.02 s	Rust	2021-06-08 19:14:29
3	Frank Endriss	0.07 s	Rust	2024-09-12 12:31:40
4	Niklas Sandén	2.45 s	Rust	2023-02-04 13:36:13
5	Yoeri Otten	2.49 s	Rust	2022-04-12 01:37:51

#	User	Length	Language	Date
1	Ivan Petrov	1859	C	2019-03-22 09:24:38
2	Hidden user	2783	C	2025-06-06 18:26:04

#	User	Length	Language	Date
1	jhoan marcos condori humeres	1602	C#	2024-11-18 04:32:26

#	User	Length	Language	Date
1	Luis Murillo	649	C++	2019-03-16 20:47:24
2	Willson Wijaya	653	C++	2020-06-05 08:24:55
3	Mohsen Dehbashi	688	C++	2020-10-04 09:05:24
4	Ernest Ng Zi Xuan	690	C++	2024-05-26 10:12:35
5	Jack Young	737	C++	2020-03-06 20:00:48
6	Ghazal Rabiei	747	C++	2020-10-04 09:05:19
7	Igor Silva	768	C++	2019-03-19 04:06:46
8	Markus Mathiasen	784	C++	2023-08-11 16:57:29
9	Julio Cesar Q	792	C++	2019-03-16 22:39:35
10	Jayden Cho	807	C++	2022-12-03 01:42:34

#	User	Length	Language	Date
1	Apurv Parekh	1061	Java	2019-03-16 21:08:14
2	Mihai Zelina	1265	Java	2019-03-16 18:16:15
3	Mateusz Michal Nowak	1266	Java	2019-10-13 14:27:41
4	GABRIEL CABERO TORRICO	1343	Java	2024-11-16 00:02:51
5	Obligado	1350	Java	2024-12-13 01:13:18
6	Dylan Lyon	1372	Java	2019-03-21 00:31:22
7	Christopher Stephens	1372	Java	2019-03-16 19:12:46
8	Cleysi Maná Chamaca Olivar	1382	Java	2024-11-16 00:24:48
9	luis fernando cardernas	1407	Java	2024-11-15 15:20:32
10	Brett Fazio	1409	Java	2019-03-16 18:09:16

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	876	JavaScript (SpiderMonkey)	2019-03-17 23:13:54
2	Christian Cederquist	9227	JavaScript (SpiderMonkey)	2023-08-09 23:40:07

#	User	Length	Language	Date
1	Noszály Csaba	351	Julia	2025-03-22 19:45:20

#	User	Length	Language	Date
1	Phường Lên	1828	Kotlin	2020-07-19 21:19:05

#	User	Length	Language	Date
1	Chik Cheng Yao	4004	OCaml	2019-10-22 20:23:53

#	User	Length	Language	Date
1	Andreas Björklund	783	Python 2	2019-06-27 18:35:36

#	User	Length	Language	Date
1	Ahmed Chamseddine	511	Python 3	2025-03-09 12:18:56
2	Noam Cohen	551	Python 3	2022-02-22 22:36:06
3	Constantijn Dekker	551	Python 3	2022-05-18 12:44:23
4	Loi Phuc Nguyen	605	Python 3	2023-10-18 12:24:05
5	Nicholas Russell Saerang	665	Python 3	2023-06-29 03:24:30
6	Erlend Haugen	695	Python 3	2022-04-25 17:35:46
7	Rasmus Pertel	710	Python 3	2025-05-24 21:34:22
8	Bo Aanes	741	Python 3	2022-04-21 20:42:30
9	Diego Galvez	749	Python 3	2024-05-24 00:39:54
10	Ethan Partidas	753	Python 3	2022-02-20 02:19:48

#	User	Length	Language	Date
1	Yoeri Otten	2782	Rust	2022-04-12 01:37:51
2	Constantijn Dekker	2811	Rust	2021-06-08 19:14:29
3	Vincent Lagerros	20011	Rust	2024-11-22 00:29:15
4	Frank Endriss	21726	Rust	2024-09-12 12:31:40
5	Niklas Sandén	29318	Rust	2023-02-04 13:36:13

Solution running time distribution