Problem A
Inverted Deck — Problem Statistics

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Submissions	2438
Accepted submissions	710
Submission ratio	29.12%
Authors	689
Full solves [?]	575
Full solve Ratio	83.45%

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.03 s	C	2019-11-17 17:47:55
2	Eyleifur Bjarkason	0.03 s	C	2019-11-20 00:04:20
3	Lawry Sorenson	0.03 s	C	2023-09-26 06:25:35
4	Ivan Petrov	0.09 s	C	2019-11-19 14:14:35
5	Teikn Smith	0.11 s	C	2023-09-26 02:51:45
6	Macdara mac an tSionnaigh	0.12 s	C	2019-11-20 15:48:49
7	Hidden user	0.12 s	C	2024-02-26 09:31:17

#	User	Runtime	Language	Date
1	Shantanu Sharma	0.31 s	C#	2025-10-13 03:20:03

#	User	Runtime	Language	Date
1	Wesley Leung	0.03 s	C++	2019-11-17 11:08:20
2	Frank Endriss	0.03 s	C++	2021-02-21 17:49:55
3	Hidden user	0.03 s	C++	2021-04-21 11:44:08
4	Agis Daniels	0.03 s	C++	2021-12-24 15:52:39
5	Lawry Sorenson	0.04 s	C++	2023-09-26 06:15:54
6	Jakob Tejs Knudsen	0.07 s	C++	2019-11-22 15:36:35
7	Damjan Polugic	0.08 s	C++	2019-11-17 22:05:22
8	Hidden user	0.08 s	C++	2019-11-26 02:31:07
9	Nick Wu	0.09 s	C++	2019-11-17 10:32:54
10	Wakaka	0.09 s	C++	2019-11-17 10:38:13

#	User	Runtime	Language	Date
1	Rudy Matela	2.95 s	Haskell	2024-11-16 19:37:05

#	User	Runtime	Language	Date
1	Ryan Tan	0.14 s	Java	2022-06-22 20:36:27
2	Bjørn Dons	0.21 s	Java	2019-11-23 19:57:11
3	Ruslan	0.35 s	Java	2023-01-13 06:31:18
4	Alice Ryhl	0.37 s	Java	2019-11-18 11:53:21
5	Quân Anh	0.41 s	Java	2024-04-20 19:10:45
6	Rene Argento	0.42 s	Java	2021-01-31 03:35:06
7	Emil Bak-Møller	0.43 s	Java	2019-11-19 16:52:17
8	Tjibbe van der Veen	0.43 s	Java	2019-11-21 21:38:27
9	Morten Flensborg Jensen	0.43 s	Java	2019-11-26 01:57:17
10	Kadin Tang	0.43 s	Java	2020-10-10 04:46:57

#	User	Runtime	Language	Date
1	Jeremiah Ang	0.97 s	JavaScript (Node.js)	2020-09-16 05:57:09

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.20 s	JavaScript (SpiderMonkey)	2019-11-23 00:18:59
2	David King	0.22 s	JavaScript (SpiderMonkey)	2019-11-25 15:07:26
3	Christian Pilegaard Cederquist	0.22 s	JavaScript (SpiderMonkey)	2023-11-08 00:03:11

#	User	Runtime	Language	Date
1	Timothy Gaede	0.65 s	Julia	2025-11-04 10:59:54

#	User	Runtime	Language	Date
1	Hidden user	0.53 s	Kotlin	2020-02-29 06:33:21
2	Phường Lên	0.98 s	Kotlin	2020-03-02 04:34:50
3	Adam Rankin	0.98 s	Kotlin	2023-10-06 05:17:35
4	Liu Yuhang	1.16 s	Kotlin	2025-04-18 04:16:27

#	User	Runtime	Language	Date
1	Andreas Björklund	0.22 s	Python 2	2019-11-17 11:15:06
2	Oskar Haarklou Veileborg	0.23 s	Python 2	2019-11-18 16:32:59
3	Conor McCauley	0.24 s	Python 2	2019-11-21 11:38:40
4	Troels Bjerre Lund	0.26 s	Python 2	2019-11-17 18:28:23
5	Maj Stenmark	0.26 s	Python 2	2019-11-18 23:28:04
6	Michael Wright	0.29 s	Python 2	2019-11-17 14:42:05
7	Hidden user	0.29 s	Python 2	2020-09-07 19:15:56
8	Anton Lyxell	0.33 s	Python 2	2019-11-17 11:45:27

#	User	Runtime	Language	Date
1	Petr	0.22 s	Python 3	2025-05-08 00:46:05
2	Stanislavs Jefimovs	0.23 s	Python 3	2021-03-25 23:54:54
3	Peter Moorhouse	0.23 s	Python 3	2022-09-22 16:22:37
4	Hidden user	0.24 s	Python 3	2022-09-06 08:06:48
5	Freja Peulicke	0.25 s	Python 3	2021-02-27 16:42:42
6	Gladwin Yeo	0.25 s	Python 3	2022-05-11 10:20:18
7	Jiayi Liu	0.25 s	Python 3	2024-12-19 22:14:47
8	Tsog Gantumur	0.26 s	Python 3	2021-09-23 00:09:12
9	Regnm0ln1	0.26 s	Python 3	2024-12-19 22:25:37
10	Valerio Camaiani	0.27 s	Python 3	2023-11-29 15:56:03

#	User	Runtime	Language	Date
1	Hidden user	0.39 s	Ruby	2019-11-19 20:44:19
2	Thomas Feld	0.73 s	Ruby	2023-10-18 12:54:45

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.02 s	Rust	2024-08-13 19:15:52
2	Daniel Anker Hermansen	0.03 s	Rust	2023-11-15 23:42:01
3	Rudi Svartveit	0.04 s	Rust	2019-11-17 22:02:00
4	Pahlevi Fikri Auliya	0.06 s	Rust	2020-10-25 00:21:04

#	User	Length	Language	Date
1	Teikn Smith	243	C	2023-09-26 04:41:53
2	Ivan Petrov	868	C	2019-11-19 14:14:35
3	Macdara mac an tSionnaigh	1256	C	2019-11-20 15:48:49
4	Lawry Sorenson	1321	C	2023-09-26 06:40:45
5	Hidden user	1341	C	2024-02-26 09:31:17
6	Bergur Snorrason	2035	C	2019-11-17 17:47:55
7	Eyleifur Bjarkason	6043	C	2019-11-20 00:04:20

#	User	Length	Language	Date
1	Shantanu Sharma	1473	C#	2025-10-13 03:20:03

#	User	Length	Language	Date
1	Hao Du	452	C++	2020-05-02 12:59:12
2	Paolo Pellizzoni	475	C++	2019-12-16 19:32:55
3	Tautvydas Jasiūnas	533	C++	2019-11-19 22:32:19
4	Koo Zhuo Hui	534	C++	2023-12-16 11:38:00
5	Alexander Skidanov	544	C++	2024-10-24 17:49:36
6	Kregor Ööbik	578	C++	2025-11-01 23:02:48
7	Seunghyun Joe	580	C++	2019-11-17 11:20:54
8	Mason Horne	589	C++	2023-08-29 04:30:54
9	Tan Kerway	591	C++	2024-12-22 12:35:22
10	Wiwit Rifa'i	600	C++	2019-11-17 10:36:59

#	User	Length	Language	Date
1	Rudy Matela	1201	Haskell	2024-11-16 19:37:05

#	User	Length	Language	Date
1	Hidden user	934	Java	2019-11-18 01:27:14
2	Neamtu Stefan	1027	Java	2019-12-03 16:30:53
3	Mark van Helvoort	1119	Java	2019-11-17 11:41:03
4	Red Dragio	1152	Java	2019-12-19 15:49:22
5	Abdelrahman Mokbel	1154	Java	2022-09-17 02:57:23
6	Doug Goodman	1175	Java	2020-07-07 19:29:08
7	Crystal Sharpe	1237	Java	2020-04-24 19:28:48
8	HUANG YUQI	1237	Java	2022-06-23 22:38:42
9	Artur Satayev	1247	Java	2019-11-17 11:25:31
10	Sadgunsai Yadav	1259	Java	2021-01-24 23:39:49

#	User	Length	Language	Date
1	Jeremiah Ang	1257	JavaScript (Node.js)	2020-09-16 05:57:09

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	890	JavaScript (SpiderMonkey)	2023-11-08 00:03:11
2	David King	1197	JavaScript (SpiderMonkey)	2019-11-25 15:07:26
3	Bjørn Chr. Soltvedt	1287	JavaScript (SpiderMonkey)	2019-11-23 00:18:59

#	User	Length	Language	Date
1	Timothy Gaede	1022	Julia	2025-11-04 10:59:54

#	User	Length	Language	Date
1	Liu Yuhang	447	Kotlin	2025-04-18 04:16:27
2	Adam Rankin	736	Kotlin	2023-10-06 05:17:35
3	Phường Lên	1266	Kotlin	2020-03-02 04:34:50
4	Hidden user	2021	Kotlin	2020-02-29 06:33:21

#	User	Length	Language	Date
1	Troels Bjerre Lund	339	Python 2	2019-11-17 18:28:23
2	Andreas Björklund	492	Python 2	2019-11-17 11:15:06
3	Maj Stenmark	525	Python 2	2019-11-18 23:28:04
4	Anton Lyxell	627	Python 2	2019-11-17 11:45:27
5	Oskar Haarklou Veileborg	666	Python 2	2019-11-18 16:32:59
6	Conor McCauley	729	Python 2	2019-11-21 11:38:40
7	Michael Wright	972	Python 2	2019-11-17 14:42:05
8	Hidden user	1603	Python 2	2020-09-07 19:15:56

#	User	Length	Language	Date
1	Josh Taylor	237	Python 3	2023-09-27 19:36:26
2	Ryan Farrell	246	Python 3	2023-09-25 23:51:20
3	Dhairya Patel	252	Python 3	2020-11-16 00:35:08
4	Albert Elezer B. Perez	302	Python 3	2023-07-05 16:25:09
5	Hrant Hovhannisyan	314	Python 3	2025-07-24 07:32:36
6	Thore Husfeldt	322	Python 3	2019-11-18 20:24:05
7	Troels Bjerre Lund	324	Python 3	2019-11-17 18:26:50
8	Brandon Tang	333	Python 3	2023-05-21 21:53:20
9	Henrik Grønbech	353	Python 3	2019-11-17 18:43:37
10	Ahmed Siadomar	357	Python 3	2022-06-01 23:22:06

#	User	Length	Language	Date
1	Thomas Feld	152	Ruby	2023-10-18 12:54:45
2	Hidden user	523	Ruby	2019-11-19 20:44:19

#	User	Length	Language	Date
1	Rudi Svartveit	1517	Rust	2019-11-17 22:02:00
2	Pahlevi Fikri Auliya	2389	Rust	2020-10-25 00:21:04
3	Vincent Lagerros	10558	Rust	2024-08-13 19:16:38
4	Daniel Anker Hermansen	24612	Rust	2023-11-15 23:42:01

Solution running time distribution