Problem I
Making Palindromes — Problem Statistics

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Submissions	755
Accepted submissions	211
Submission ratio	27.95%
Authors	199
Full solves [?]	165
Full solve Ratio	82.91%

#	User	Runtime	Language	Date
1	Ivan Petrov	0.28 s	C	2020-02-07 10:57:44

#	User	Runtime	Language	Date
1	Min-Zheng Shieh	0.02 s	C++	2018-09-15 10:55:15
2	Nikola Katov	0.02 s	C++	2025-05-17 03:23:34
3	Steven Halim	0.03 s	C++	2018-09-11 07:51:54
4	Vu Hoang Kien	0.03 s	C++	2018-09-15 04:51:46
5	Tan-Phat Tran	0.03 s	C++	2018-09-15 05:37:08
6	Dat Vu	0.03 s	C++	2018-09-15 06:02:45
7	Luke Videckis	0.03 s	C++	2018-12-25 02:26:13
8	Tấn Phát Trần	0.03 s	C++	2019-02-06 18:41:22
9	Andrei Cotor	0.03 s	C++	2021-11-16 07:39:47
10	paopaomate	0.03 s	C++	2026-03-16 06:17:28

#	User	Runtime	Language	Date
1	Nguyễn Mạnh Phúc	0.19 s	Java	2018-09-22 09:32:02
2	Taras Romanyuk	0.22 s	Java	2024-11-16 01:26:21

#	User	Runtime	Language	Date
1	Paul McBurney	0.31 s	Kotlin	2025-09-10 03:13:26
2	Paul McBurney	0.31 s	Kotlin	2025-09-12 14:33:10

#	User	Runtime	Language	Date
1	Bertrand Evertz	0.21 s	Python 2	2020-12-21 01:55:20

#	User	Runtime	Language	Date
1	Dilhan Salgado	0.30 s	Python 3	2025-09-16 00:55:08
2	Prateek Bhakta	0.41 s	Python 3	2022-01-28 01:13:41
3	Hrant Hovhannisyan	0.46 s	Python 3	2025-07-25 08:41:48
4	Nguyen Cao Duy	0.48 s	Python 3	2024-02-07 04:22:28
5	Nicholas Russell Saerang	0.49 s	Python 3	2023-10-18 10:35:19
6	Firman Syah	0.50 s	Python 3	2025-08-25 11:44:32
7	Prakhar Gandhi	0.55 s	Python 3	2024-02-28 06:11:45

#	User	Length	Language	Date
1	Ivan Petrov	1204	C	2020-02-07 10:57:44

#	User	Length	Language	Date
1	Ibrahem Elhdad	528	C++	2024-06-24 02:03:19
2	Ruihang Lai	534	C++	2018-09-15 09:41:55
3	Liyi Guo	555	C++	2018-09-15 15:24:56
4	Kevin Luvian	600	C++	2018-09-15 06:20:18
5	Tan Nguyen	643	C++	2018-09-15 05:20:14
6	Nguyen Xuan Tung	650	C++	2020-09-02 16:54:15
7	Chen Tong	653	C++	2018-09-15 05:09:38
8	Lim An Jun	673	C++	2022-11-30 02:43:59
9	Vinh Nguyễn Thành	713	C++	2018-09-15 05:08:25
10	Vinda Huang	733	C++	2018-09-15 13:20:33

#	User	Length	Language	Date
1	Taras Romanyuk	3001	Java	2024-11-16 01:26:21
2	Nguyễn Mạnh Phúc	7750	Java	2018-09-22 09:32:02

#	User	Length	Language	Date
1	Paul McBurney	1626	Kotlin	2025-09-10 03:13:26
2	Paul McBurney	1697	Kotlin	2025-09-12 14:33:10

#	User	Length	Language	Date
1	Bertrand Evertz	1455	Python 2	2020-12-20 17:06:44

#	User	Length	Language	Date
1	Nicholas Russell Saerang	426	Python 3	2023-10-18 10:35:19
2	Nguyen Cao Duy	426	Python 3	2024-02-07 04:22:28
3	Prakhar Gandhi	461	Python 3	2024-02-28 06:11:45
4	Hrant Hovhannisyan	530	Python 3	2025-07-25 08:41:48
5	Prateek Bhakta	796	Python 3	2022-01-28 01:13:41
6	Firman Syah	829	Python 3	2025-08-25 11:44:32
7	Dilhan Salgado	872	Python 3	2025-09-16 00:55:08

Solution running time distribution