Problem A
Exact Change — Problem Statistics

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Submissions	12136
Accepted submissions	3168
Submission ratio	26.10%
Authors	2530
Full solves [?]	1883
Full solve Ratio	74.43%

#	User	Runtime	Language	Date
1	James Rettie	0.00 s	C	2022-10-25 06:33:03
2	Hidden user	0.00 s	C	2024-04-08 08:09:12
3	Prateek Jain	0.01 s	C	2015-06-20 13:23:35
4	Lawrence Li	0.01 s	C	2016-02-03 07:24:11
5	Thibault Raffaillac	0.01 s	C	2016-05-25 19:08:03
6	Amad Askor	0.01 s	C	2016-08-15 22:20:35
7	Ruichao Zhang	0.01 s	C	2016-09-30 21:37:28
8	Hidden user	0.01 s	C	2017-11-23 16:57:44
9	Jonatan Šega Car	0.01 s	C	2018-09-07 22:51:41
10	Vương Thiện Trung	0.01 s	C	2018-10-12 19:51:34

#	User	Runtime	Language	Date
1	Rasmus Føgh Sørensen	0.03 s	C#	2022-10-04 13:04:16
2	Amanda Rasille	0.04 s	C#	2021-09-25 17:02:36
3	Adam Grady	0.04 s	C#	2021-10-08 19:24:57
4	Nguyễn Thị Thùy Dung	0.05 s	C#	2016-07-17 17:21:55
5	Nguyễn Thị Thùy Dung	0.05 s	C#	2016-07-17 17:28:17
6	Nguyễn Mạnh Hùng	0.05 s	C#	2016-07-18 05:08:31
7	Phan Trọng Phúc	0.05 s	C#	2016-07-18 05:33:28
8	Andrzej Krajniak	0.05 s	C#	2017-07-30 16:54:09
9	Dỗn Lùng	0.05 s	C#	2019-12-08 03:35:03
10	Hidden user	0.05 s	C#	2021-09-25 17:10:44

#	User	Runtime	Language	Date
1	Abhinav Dusi	0.69 s	Common Lisp	2021-10-14 08:13:11

#	User	Runtime	Language	Date
1	Norbert Voelker	0.07 s	Go	2023-04-17 22:37:00
2	Anthony Alves	0.10 s	Go	2018-02-11 05:55:08
3	Việt Hà Nguyễn	0.13 s	Go	2016-07-17 13:10:04

#	User	Runtime	Language	Date
1	Mikail Khan	0.03 s	Haskell	2022-02-28 03:09:53
2	Zach Tschetter	0.23 s	Haskell	2021-05-18 17:16:00
3	Johan Meier	0.45 s	Haskell	2017-01-13 05:02:53

#	User	Runtime	Language	Date
1	Erik Odenman	0.09 s	Java	2014-03-06 17:49:21
2	Hidden user	0.09 s	Java	2014-12-09 18:41:05
3	Bjørn Dons	0.09 s	Java	2018-12-13 22:54:33
4	Daniyal Ahmad Bekinalkar	0.09 s	Java	2023-10-06 02:16:28
5	Anders Ye	0.10 s	Java	2014-03-06 18:28:59
6	Snæbjörn Þórir Eyjólfsson	0.10 s	Java	2014-12-09 16:23:39
7	Erik Baalhuis	0.10 s	Java	2016-08-03 19:29:44
8	Sahibzada Ahmad Masood	0.10 s	Java	2018-10-25 20:41:13
9	Andree Kaba	0.10 s	Java	2018-10-26 06:35:19
10	Ralf Erik	0.10 s	Java	2025-06-13 16:24:16

#	User	Runtime	Language	Date
1	Ricardo	0.48 s	JavaScript (Node.js)	2020-10-29 17:27:05

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.05 s	JavaScript (SpiderMonkey)	2023-06-08 17:00:49
2	Ionel Hindorean	0.08 s	JavaScript (SpiderMonkey)	2017-03-12 11:29:52
3	Ragur Krishnan	0.08 s	JavaScript (SpiderMonkey)	2017-12-23 01:25:33
4	Hà Minh Ngọc	0.66 s	JavaScript (SpiderMonkey)	2019-09-28 07:42:44

#	User	Runtime	Language	Date
1	Noszály Csaba	0.45 s	Julia	2025-03-17 09:48:35

#	User	Runtime	Language	Date
1	Peter Mikkelsen	0.26 s	Kotlin	2021-09-30 19:37:05
2	Danny Mittal	0.27 s	Kotlin	2022-09-21 01:16:36
3	Leonard Alexander Blechschmidt	0.28 s	Kotlin	2021-12-06 16:38:42
4	Phường Lên	0.38 s	Kotlin	2020-07-10 23:09:57

#	User	Runtime	Language	Date
1	Erik Tjøswold	0.06 s	Python 2	2017-12-30 12:52:05
2	Ruiyang Wang	0.06 s	Python 2	2019-11-01 21:52:37
3	Thomas Feld	0.06 s	Python 2	2020-06-22 13:49:43
4	Bojan Roško	0.07 s	Python 2	2015-06-28 22:22:25
5	Tim Daniel	0.07 s	Python 2	2021-02-24 18:36:11
6	Hepic Hepic	0.08 s	Python 2	2015-06-22 17:18:22
7	Hidden user	0.08 s	Python 2	2017-11-23 17:17:02
8	Oskar Haarklou Veileborg	0.08 s	Python 2	2019-12-19 14:39:55
9	Peter Mikkelsen	0.08 s	Python 2	2021-02-25 13:54:56
10	Robert Welin-Berger	0.10 s	Python 2	2018-11-19 20:11:21

#	User	Runtime	Language	Date
1	Nikolaj Munk Binder Jensen	0.06 s	Python 3	2025-02-13 11:52:28
2	Tan Le	0.06 s	Python 3	2025-10-09 22:53:35
3	Alisa Gagina	0.07 s	Python 3	2021-02-22 00:58:54
4	Hidden user	0.07 s	Python 3	2021-09-24 16:05:09
5	Oscar Werner	0.07 s	Python 3	2021-10-06 21:28:37
6	Bertram Højer	0.07 s	Python 3	2022-09-29 10:18:42
7	Bjarke Dalhoff	0.07 s	Python 3	2022-09-29 11:03:32
8	Julius Roder	0.07 s	Python 3	2022-09-29 11:28:39
9	Varun Asuri	0.07 s	Python 3	2022-10-07 02:59:50
10	Benjamin Apelman	0.07 s	Python 3	2023-07-28 17:20:21

#	User	Runtime	Language	Date
1	Andreas Severin Hauch Trøstrup	0.63 s	Ruby	2024-09-14 13:32:35

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2024-07-07 15:05:56
2	Nicholas Bachmann Tjørnelund	0.01 s	Rust	2021-02-25 13:50:51
3	Juri Petersen	0.01 s	Rust	2022-09-29 07:48:34
4	Anthony Helsel	0.01 s	Rust	2023-07-28 19:05:22
5	Hidden user	0.01 s	Rust	2023-12-07 19:35:37
6	Arvid Kristoffersson	0.01 s	Rust	2024-09-05 14:18:01
7	Lukas Dutrieux	0.01 s	Rust	2025-10-08 18:12:55
8	Hidden user	0.02 s	Rust	2021-09-24 15:44:48
9	Joe Blower	0.02 s	Rust	2025-09-05 04:00:40
10	Thomas Hügel	0.03 s	Rust	2020-12-31 21:13:05

#	User	Length	Language	Date
1	Thibault Raffaillac	554	C	2016-05-25 19:08:03
2	pengin	623	C	2021-07-13 12:10:11
3	Gabriel Stanculescu	626	C	2025-02-15 03:48:01
4	Caeden Whitaker	638	C	2022-01-01 05:57:24
5	Noah Ó Donnaile	698	C	2017-02-26 15:55:38
6	Jonatan Šega Car	734	C	2018-09-07 22:52:39
7	Kangrui Ren	737	C	2019-11-01 22:19:44
8	Yimeng Hu	737	C	2019-11-22 20:22:10
9	Prateek Jain	747	C	2015-06-20 13:23:35
10	Amad Askor	747	C	2016-08-15 22:20:35

#	User	Length	Language	Date
1	Amanda Rasille	1113	C#	2021-09-25 17:09:23
2	Hidden user	1143	C#	2021-09-25 17:10:44
3	Adam Grady	1275	C#	2021-10-08 19:24:57
4	Jayant Notani	1415	C#	2020-04-26 06:31:46
5	Rasmus Føgh Sørensen	1566	C#	2022-10-04 13:04:16
6	Nguyễn Duy Khánh	1740	C#	2016-07-17 16:44:05
7	Duy Khánh	1740	C#	2016-07-17 16:56:26
8	Asger Schou Jacobsen	1934	C#	2022-10-03 12:42:40
9	Phan Trọng Phúc	1946	C#	2016-07-18 05:33:28
10	Dỗn Lùng	2163	C#	2019-12-08 03:35:03

#	User	Length	Language	Date
1	Hidden user	385	C++	2018-11-16 19:41:44
2	Hidden user	420	C++	2024-08-23 17:30:06
3	Johan Wind	438	C++	2017-05-28 22:53:42
4	Alfredo Beaumont	458	C++	2021-06-14 23:57:52
5	Li Yao'an	464	C++	2016-02-03 07:42:01
6	Jessica Ilone	488	C++	2021-03-29 03:43:52
7	Taulant Arapi	495	C++	2020-08-06 16:38:23
8	Lim An Jun	496	C++	2023-02-11 12:06:11
9	Modan Han	503	C++	2015-11-26 02:35:33
10	Zane Yu	504	C++	2019-01-04 08:36:29

#	User	Length	Language	Date
1	Abhinav Dusi	1263	Common Lisp	2021-10-14 08:13:11

#	User	Length	Language	Date
1	Anthony Alves	1259	Go	2018-02-11 05:55:08
2	Việt Hà Nguyễn	1467	Go	2016-07-17 13:10:04
3	Norbert Voelker	1613	Go	2023-04-17 22:37:00

#	User	Length	Language	Date
1	Johan Meier	1302	Haskell	2017-01-13 05:02:53
2	Mikail Khan	1322	Haskell	2022-02-28 03:09:53
3	Zach Tschetter	1497	Haskell	2021-05-18 17:16:00

#	User	Length	Language	Date
1	Sahibzada Ahmad Masood	595	Java	2018-10-25 21:06:06
2	Stephen Royal	719	Java	2015-08-24 15:37:31
3	Vikas Kushwaha	774	Java	2015-07-16 07:16:53
4	Darrin Wiley	814	Java	2016-01-06 03:19:31
5	Steve Tate	817	Java	2016-10-14 19:32:17
6	Ethan Wipond	823	Java	2017-10-05 23:43:13
7	Kiên Nguyễn Tiến Trung	832	Java	2017-02-15 11:51:57
8	Bill Fei	852	Java	2020-07-06 17:22:37
9	Doug Goodman	859	Java	2016-06-30 17:33:58
10	Hidden user	866	Java	2022-04-22 18:44:59

#	User	Length	Language	Date
1	Ricardo	862	JavaScript (Node.js)	2020-10-29 17:27:05

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	942	JavaScript (SpiderMonkey)	2023-06-08 17:00:49
2	Ragur Krishnan	978	JavaScript (SpiderMonkey)	2017-12-23 01:25:33
3	Hà Minh Ngọc	1172	JavaScript (SpiderMonkey)	2016-08-02 11:21:18
4	Ionel Hindorean	1219	JavaScript (SpiderMonkey)	2017-03-12 10:58:15

#	User	Length	Language	Date
1	Noszály Csaba	1146	Julia	2025-03-17 09:48:35

#	User	Length	Language	Date
1	Danny Mittal	471	Kotlin	2022-09-21 01:16:36
2	Peter Mikkelsen	1007	Kotlin	2021-09-30 19:31:46
3	Leonard Alexander Blechschmidt	1144	Kotlin	2021-12-06 16:38:42
4	Phường Lên	1808	Kotlin	2020-07-10 23:09:57

#	User	Length	Language	Date
1	Thomas Feld	350	Python 2	2020-06-22 13:49:43
2	Erik Tjøswold	421	Python 2	2017-12-30 12:52:05
3	Oskar Haarklou Veileborg	454	Python 2	2019-12-19 14:39:55
4	Thore Husfeldt	455	Python 2	2019-08-23 07:47:48
5	Bojan Roško	483	Python 2	2015-06-28 22:22:25
6	Brandon Sovran	516	Python 2	2022-02-15 19:35:05
7	Иззатбек Муханов	591	Python 2	2016-05-28 13:40:28
8	Lars Åström	592	Python 2	2019-11-14 15:36:31
9	Asger Hautop Drewsen	598	Python 2	2018-09-18 20:23:28
10	Tim Daniel	612	Python 2	2021-02-24 18:36:11

#	User	Length	Language	Date
1	Nikolaj Munk Binder Jensen	178	Python 3	2025-02-13 14:07:35
2	Jonathan Hallström	211	Python 3	2023-12-16 13:41:52
3	Michael Goldwasser	223	Python 3	2024-09-22 07:57:56
4	Ryan Farrell	265	Python 3	2024-08-01 20:38:25
5	David Farrow	324	Python 3	2023-07-29 07:44:16
6	Nicholas Russell Saerang	332	Python 3	2023-06-19 20:06:02
7	Szu-Chi Huang	332	Python 3	2023-06-28 10:47:21
8	Thibault Raffaillac	339	Python 3	2023-03-16 18:43:41
9	Jian Shi	354	Python 3	2022-10-29 06:25:22
10	Kelly Dance	362	Python 3	2022-08-24 18:06:41

#	User	Length	Language	Date
1	Andreas Severin Hauch Trøstrup	707	Ruby	2024-09-14 13:33:45

#	User	Length	Language	Date
1	Nicholas Bachmann Tjørnelund	905	Rust	2021-02-25 13:55:39
2	Arvid Kristoffersson	972	Rust	2024-09-05 14:18:01
3	Anthony Helsel	1001	Rust	2023-07-28 19:05:22
4	Hidden user	1198	Rust	2023-12-07 19:35:37
5	Lukas Dutrieux	1366	Rust	2025-10-08 18:12:55
6	Albert Rise Nielsen	1400	Rust	2023-02-14 16:28:56
7	Philip Mørch	1585	Rust	2024-09-29 18:23:15
8	Thomas Hügel	1704	Rust	2020-12-31 21:13:05
9	Andreas Severin Hauch Trøstrup	1783	Rust	2024-09-14 14:16:02
10	Andreas Just Petersen	1799	Rust	2023-09-19 14:28:10

Solution running time distribution