Problem I
Cleaning Robot — Problem Statistics

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Submissions	898
Accepted submissions	195
Submission ratio	21.71%
Authors	211
Full solves [?]	156
Full solve Ratio	73.93%

#	User	Runtime	Language	Date
1	Theodore Pan	0.53 s	C++	2023-05-08 00:02:28
2	Jason Yuen	0.59 s	C++	2021-08-14 17:59:07
3	Kelly Dance	0.60 s	C++	2023-05-09 02:06:04
4	Jeremy Lim	0.61 s	C++	2025-06-13 18:37:50
5	Carlos Miguel Soto	0.63 s	C++	2023-01-27 20:18:29
6	Mingyang Deng	0.71 s	C++	2021-08-14 17:54:37
7	Eric Hu	0.71 s	C++	2021-08-14 19:34:55
8	Seyoon Ragavan	0.75 s	C++	2021-08-14 20:07:12
9	Federico Quijada	0.75 s	C++	2023-01-28 21:51:12
10	Vittal Ayer	0.81 s	C++	2025-10-30 05:39:16

#	User	Runtime	Language	Date
1	Bjørn Dons	1.69 s	Java	2023-01-08 21:22:29
2	Joshua Fair	2.74 s	Java	2021-08-14 17:55:59
3	Arnav Sastry	3.30 s	Java	2022-03-08 04:17:03
4	Liang Lyu	3.92 s	Java	2021-08-14 19:50:50
5	Arup Ratan Guha	6.84 s	Java	2022-05-20 20:05:59
6	Ray Bai	7.15 s	Java	2021-08-14 18:48:41

#	User	Runtime	Language	Date
1	Jacob Huebner	1.89 s	Kotlin	2022-04-26 00:15:45

#	User	Runtime	Language	Date
1	Pratyanch Jain	7.57 s	Python 2	2024-04-12 07:04:33

#	User	Runtime	Language	Date
1	Nikil Roashan Selvam	4.24 s	Python 3	2025-05-04 04:29:49
2	Lucas Patten	4.74 s	Python 3	2024-07-25 06:00:06
3	Caleb Dastrup	4.95 s	Python 3	2024-07-25 05:46:29
4	Andy Liang	7.17 s	Python 3	2025-05-04 04:26:31
5	Ryan Farrell	7.80 s	Python 3	2024-07-25 04:03:50

#	User	Length	Language	Date
1	Jingbang Chen	1790	C++	2021-08-14 18:02:04
2	Quanquan Liu	1851	C++	2021-08-15 15:49:25
3	Alexander Skidanov	2004	C++	2025-01-20 20:58:53
4	Felipe Chen Wu	2039	C++	2023-01-27 22:05:54
5	Jeremy Lim	2039	C++	2025-06-13 18:37:50
6	Andrew He	2066	C++	2021-08-14 17:44:03
7	Phan Đình Khôi	2075	C++	2023-12-15 02:59:35
8	Antonio Hachisuca	2095	C++	2024-06-14 23:06:33
9	Илья Малиновский	2104	C++	2025-01-20 20:04:28
10	Simon	2128	C++	2022-04-26 20:32:33

#	User	Length	Language	Date
1	Arnav Sastry	3008	Java	2022-03-08 04:17:03
2	Arup Ratan Guha	4433	Java	2022-05-20 20:05:59
3	Joshua Fair	5395	Java	2021-08-14 17:55:59
4	Ray Bai	9101	Java	2021-08-14 18:48:41
5	Bjørn Dons	9159	Java	2023-01-08 21:22:29
6	Liang Lyu	9760	Java	2021-08-14 19:50:50

#	User	Length	Language	Date
1	Jacob Huebner	4220	Kotlin	2022-04-26 00:15:45

#	User	Length	Language	Date
1	Pratyanch Jain	3159	Python 2	2024-04-12 07:04:33

#	User	Length	Language	Date
1	Nikil Roashan Selvam	998	Python 3	2025-05-04 04:38:03
2	Lucas Patten	1113	Python 3	2024-07-25 06:00:06
3	Caleb Dastrup	1282	Python 3	2024-07-25 05:49:00
4	Ryan Farrell	1541	Python 3	2024-07-25 04:03:50
5	Andy Liang	2479	Python 3	2025-05-04 04:26:31

Solution running time distribution