Problem A
Piano Lessons — Problem Statistics

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Submissions	1863
Accepted submissions	826
Submission ratio	44.34%
Authors	628
Full solves [?]	545
Full solve Ratio	86.78%

#	User	Runtime	Language	Date
1	Ivan Petrov	0.06 s	C	2019-03-22 08:24:38
2	Mirel Cosulschi	0.76 s	C	2025-06-06 16:26:04

#	User	Runtime	Language	Date
1	jhoan marcos condori humeres	0.80 s	C#	2024-11-18 03:32:26

#	User	Runtime	Language	Date
1	Constantijn Dekker	0.01 s	C++	2021-03-13 14:08:15
2	Alper Tuzcu	0.01 s	C++	2022-10-06 23:42:00
3	Isaac Arvestad	0.04 s	C++	2019-04-08 17:38:37
4	Tyler Marks	0.04 s	C++	2022-02-19 21:54:20
5	Henry Xia	0.04 s	C++	2022-05-15 05:08:48
6	Luke Videckis	0.04 s	C++	2022-05-28 18:50:27
7	Lucas Turci	0.05 s	C++	2019-03-16 16:49:34
8	Wesley Leung	0.05 s	C++	2019-03-16 16:51:00
9	Sean Purcell	0.05 s	C++	2019-03-16 16:59:48
10	Rodrigo Weigert	0.05 s	C++	2019-03-16 17:16:11

#	User	Runtime	Language	Date
1	Kevin Lim Yong Shen	0.31 s	Java	2022-04-30 05:58:59
2	Danny Mittal	0.33 s	Java	2022-09-20 23:59:37
3	William Quiroga	0.46 s	Java	2019-03-19 18:46:06
4	Jacob Magnuson	0.48 s	Java	2019-03-19 02:07:04
5	Arup Ratan Guha	0.57 s	Java	2019-03-18 04:04:59
6	Max Bagatini Alves	0.60 s	Java	2022-02-24 20:06:06
7	Godmar Back	0.64 s	Java	2021-10-07 17:47:37
8	Benjamin Reidys	0.68 s	Java	2019-03-16 22:49:22
9	Thomas King	0.70 s	Java	2020-08-02 01:34:49
10	Micah Stairs	0.74 s	Java	2019-03-17 16:19:07

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	1.20 s	JavaScript (SpiderMonkey)	2023-08-09 21:40:07
2	Bjørn Chr. Soltvedt	5.20 s	JavaScript (SpiderMonkey)	2019-03-17 22:13:54

#	User	Runtime	Language	Date
1	Hidden user	0.64 s	Julia	2025-03-22 18:45:20

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

#	User	Runtime	Language	Date
1	Chik Cheng Yao	0.76 s	OCaml	2019-10-22 18:23:53

#	User	Runtime	Language	Date
1	Andreas Björklund	0.13 s	Python 2	2019-06-27 16:35:36

#	User	Runtime	Language	Date
1	Chris Cervania	0.09 s	Python 3	2025-11-30 22:50:27
2	Cole Dewis	0.10 s	Python 3	2023-11-17 16:47:27
3	Carlin Boyles	0.10 s	Python 3	2023-11-22 04:38:19
4	Hidden user	0.10 s	Python 3	2023-12-08 07:09:03
5	Hamidat	0.10 s	Python 3	2025-11-27 15:20:15
6	Roderick Lan	0.10 s	Python 3	2025-12-08 21:06:34
7	Hidden user	0.11 s	Python 3	2022-11-30 02:23:22
8	Ahmad Amali	0.11 s	Python 3	2022-12-04 21:40:06
9	Jeremiah Daniel Regalario	0.11 s	Python 3	2025-06-13 17:46:22
10	Zahid Hasan	0.11 s	Python 3	2025-12-03 01:39:35

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.01 s	Rust	2025-03-15 23:55:06
2	Constantijn Dekker	0.02 s	Rust	2021-06-08 17:14:29
3	Frank Endriss	0.07 s	Rust	2024-09-12 10:31:40
4	Krish Lal	0.31 s	Rust	2025-12-01 01:17:52
5	Logan Travis	0.32 s	Rust	2025-11-24 03:29:36
6	Niklas Sandén	2.45 s	Rust	2023-02-04 12:36:13
7	Yoeri Otten	2.49 s	Rust	2022-04-11 23:37:51

#	User	Length	Language	Date
1	Ivan Petrov	1859	C	2019-03-22 08:24:38
2	Mirel Cosulschi	2783	C	2025-06-06 16:26:04

#	User	Length	Language	Date
1	jhoan marcos condori humeres	1602	C#	2024-11-18 03:32:26

#	User	Length	Language	Date
1	Luis Murillo	649	C++	2019-03-16 19:47:24
2	Hidden user	653	C++	2020-06-05 06:24:55
3	Mohsen Dehbashi	688	C++	2020-10-04 07:05:24
4	Ernest Ng Zi Xuan	690	C++	2024-05-26 08:12:35
5	Jack Young	737	C++	2020-03-06 19:00:48
6	Ghazal Rabiei	747	C++	2020-10-04 07:05:19
7	Igor Silva	768	C++	2019-03-19 03:06:46
8	Markus Mathiasen	784	C++	2023-08-11 14:57:29
9	Julio Cesar Q	792	C++	2019-03-16 21:39:35
10	Jayden Cho	807	C++	2022-12-03 00:42:34

#	User	Length	Language	Date
1	Apurv Parekh	1061	Java	2019-03-16 20:08:14
2	Caren Zurita Mallcu	1070	Java	2025-10-10 03:36:05
3	OLIVER MIGUEL MURILLO CHAVEZ	1237	Java	2025-10-12 19:35:36
4	Mihai Zelina	1265	Java	2019-03-16 17:16:15
5	Mateusz Michal Nowak	1266	Java	2019-10-13 12:27:41
6	GABRIEL CABERO TORRICO	1343	Java	2024-11-15 23:02:51
7	Obligado	1350	Java	2024-12-13 00:13:18
8	Christopher Stephens	1372	Java	2019-03-16 18:12:46
9	Dylan Lyon	1372	Java	2019-03-20 23:31:22
10	Cleysi Maná Chamaca Olivar	1382	Java	2024-11-15 23:24:48

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	876	JavaScript (SpiderMonkey)	2019-03-17 22:13:54
2	Christian Pilegaard Cederquist	9227	JavaScript (SpiderMonkey)	2023-08-09 21:40:07

#	User	Length	Language	Date
1	Hidden user	351	Julia	2025-03-22 18:45:20

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

#	User	Length	Language	Date
1	Chik Cheng Yao	4004	OCaml	2019-10-22 18:23:53

#	User	Length	Language	Date
1	Andreas Björklund	783	Python 2	2019-06-27 16:35:36

#	User	Length	Language	Date
1	Ahmed Chamseddine	511	Python 3	2025-03-09 11:18:56
2	Noam Cohen	551	Python 3	2022-02-22 21:36:06
3	Constantijn Dekker	551	Python 3	2022-05-18 10:44:23
4	Loi Phuc Nguyen	605	Python 3	2023-10-18 10:24:05
5	Khittimasug Jangpai	607	Python 3	2025-07-18 13:21:38
6	Nicholas Russell Saerang	665	Python 3	2023-06-29 01:24:30
7	Ximeng Duan	670	Python 3	2025-12-02 22:44:39
8	Erlend Haugen	695	Python 3	2022-04-25 15:35:46
9	Rasmus Pertel	710	Python 3	2025-05-24 19:34:22
10	DAVID ARTURO SALDAÑA VEIZAGA	725	Python 3	2025-10-13 01:10:44

#	User	Length	Language	Date
1	Yoeri Otten	2782	Rust	2022-04-11 23:37:51
2	Constantijn Dekker	2811	Rust	2021-06-08 17:14:29
3	Logan Travis	6719	Rust	2025-11-24 03:29:36
4	Krish Lal	7802	Rust	2025-12-01 01:17:52
5	Vincent Lagerros	20049	Rust	2024-11-21 23:29:15
6	Frank Endriss	21726	Rust	2024-09-12 10:31:40
7	Niklas Sandén	29318	Rust	2023-02-04 12:36:13

Solution running time distribution