Problem A
Letter Optimization — Problem Statistics

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Submissions	1044
Accepted submissions	1003
Submission ratio	96.07%
Authors	265
Full solves [?]	195
Full solve Ratio	73.58%

#	User	Score	Language	Date
1	Bergur Snorrason	100	C	2020-12-18 12:34:46
2	Alexander Bilde Pedersen	100	C	2025-11-16 21:24:58

#	User	Score	Language	Date
1	Markus Swift	100	C#	2018-11-30 20:02:52
2	Loke Gustafsson	100	C#	2018-12-01 14:58:20
3	Niklas Sandén	100	C#	2018-12-02 00:50:06
4	Ibrahim Abdulhussein	100	C#	2018-12-02 13:04:52
5	Marek Gibek	100	C#	2020-12-05 15:07:56
6	Momir Maric	54	C#	2022-03-27 09:43:44
7	Ellinor Jönson	25	C#	2018-12-02 14:27:18

#	User	Score	Language	Date
1	Norbert Voelker	100	Go	2022-07-31 11:51:28

#	User	Score	Language	Date
1	Brent Yorgey	100	Haskell	2022-02-21 15:35:31
2	Fumiaki Takagi	100	Haskell	2023-01-27 01:39:11
3	Udo Stenzel	100	Haskell	2023-03-13 12:29:50
4	TJ Takei	100	Haskell	2025-08-26 10:32:35
5	Filippo Sestini	46	Haskell	2023-06-06 20:51:24

#	User	Score	Language	Date
1	Hidden user	46	JavaScript (Node.js)	2022-07-13 10:09:32
2	Carl Sundvall	25	JavaScript (Node.js)	2018-11-30 10:21:25

#	User	Score	Language	Date
1	Bjørn Chr. Soltvedt	0	JavaScript (SpiderMonkey)	2020-12-08 07:05:26

#	User	Score	Language	Date
1	Hidden user	54	Julia	2023-06-21 16:05:55

#	User	Score	Language	Date
1	Jacob Huebner	100	Kotlin	2021-10-16 01:19:01
2	Kate Eckhart	100	Kotlin	2022-03-02 06:01:51

#	User	Score	Language	Date
1	Mateusz Drwal	100	Python 2	2018-11-30 00:40:17
2	Lars Åström	100	Python 2	2018-11-30 00:44:53
3	Hugo Eberhard	46	Python 2	2018-12-01 15:11:23
4	Fredrik Ekholm	25	Python 2	2018-11-29 15:14:08
5	Simon Lindholm	25	Python 2	2018-11-29 16:46:40

#	User	Score	Language	Date
1	Hidden user	100	Ruby	2023-07-16 13:50:27
2	Natanael Lundberg	46	Ruby	2022-11-07 22:39:58
3	Hugo Winbladh	25	Ruby	2018-12-01 21:44:43

#	User	Score	Language	Date
1	Martin Söderman	100	Rust	2018-12-02 13:06:50
2	Daniel Anker Hermansen	100	Rust	2022-11-28 16:33:58
3	Erik Magnusson	100	Rust	2024-01-31 15:32:18
4	Bas Dirks	0	Rust	2022-01-16 21:19:40

#	User	Runtime	Language	Date
1	Bergur Snorrason	0.02 s	C	2020-12-18 12:34:46
2	Alexander Bilde Pedersen	0.05 s	C	2025-11-16 21:24:58

#	User	Runtime	Language	Date
1	Markus Swift	0.18 s	C#	2018-11-30 20:02:52
2	Niklas Sandén	0.25 s	C#	2018-12-02 00:50:06
3	Loke Gustafsson	0.36 s	C#	2018-12-01 14:58:20
4	Ibrahim Abdulhussein	0.38 s	C#	2018-12-02 13:04:52
5	Marek Gibek	0.62 s	C#	2020-12-05 15:07:56

#	User	Runtime	Language	Date
1	Hidden user	0.02 s	C++	2020-12-12 17:01:13
2	Zhang Jikun	0.02 s	C++	2022-07-29 08:59:40
3	Alexander Kravberg	0.02 s	C++	2023-02-26 00:43:36
4	Gustav Kalander	0.04 s	C++	2018-11-29 21:11:54
5	Hidden user	0.04 s	C++	2022-02-09 13:22:54
6	Hidden user	0.04 s	C++	2022-02-13 06:03:38
7	Mohsen Mahroos	0.04 s	C++	2022-07-20 06:37:14
8	Joshua Andersson	0.04 s	C++	2022-08-22 13:33:19
9	Evan Michael Bailey	0.04 s	C++	2024-02-18 16:40:28
10	Atli Fannar Franklín	0.04 s	C++	2024-12-03 16:13:02

#	User	Runtime	Language	Date
1	Norbert Voelker	0.27 s	Go	2022-07-31 11:51:28

#	User	Runtime	Language	Date
1	TJ Takei	0.61 s	Haskell	2025-08-26 10:32:35
2	Brent Yorgey	0.83 s	Haskell	2023-03-20 16:27:39
3	Fumiaki Takagi	0.86 s	Haskell	2023-01-27 01:39:11
4	Udo Stenzel	1.06 s	Haskell	2023-03-13 12:29:50

#	User	Runtime	Language	Date
1	Crystal Sharpe	0.22 s	Java	2020-12-16 05:25:07
2	Logan Pipes	0.24 s	Java	2023-05-25 02:28:52
3	Bjørn Dons	0.24 s	Java	2023-07-11 15:50:56
4	Lars Corbijn	0.54 s	Java	2021-11-06 19:57:28
5	Kadin Tang	0.59 s	Java	2021-01-05 08:58:59
6	Gary Gurlaskie	0.61 s	Java	2022-04-30 01:24:15
7	Kevin Lim Yong Shen	0.65 s	Java	2022-02-09 04:52:28
8	Sawyer Stanley	0.72 s	Java	2022-03-15 16:58:56
9	Pim Agterberg	0.76 s	Java	2022-06-28 16:37:29
10	Brianna Dunfield	0.86 s	Java	2022-03-15 21:51:26

#	User	Runtime	Language	Date
1	Jacob Huebner	0.54 s	Kotlin	2021-10-16 01:19:01
2	Kate Eckhart	1.13 s	Kotlin	2022-03-02 06:01:51

#	User	Runtime	Language	Date
1	Lars Åström	0.31 s	Python 2	2018-11-30 00:44:53
2	Mateusz Drwal	0.58 s	Python 2	2018-11-30 00:40:17

#	User	Runtime	Language	Date
1	Russell Ng	0.21 s	Python 3	2026-02-08 22:36:56
2	Tai Tze Kin	0.22 s	Python 3	2025-02-18 06:19:44
3	Hidden user	0.22 s	Python 3	2026-02-13 17:45:50
4	Oskar Haarklou Veileborg	0.23 s	Python 3	2021-04-06 14:16:08
5	Ole Vik Lysne	0.23 s	Python 3	2024-09-05 14:16:29
6	Tobias Bessler	0.24 s	Python 3	2025-05-01 01:29:53
7	Steven Halim	0.26 s	Python 3	2024-01-09 09:48:04
8	Kadriye Yildiz	0.27 s	Python 3	2024-08-22 01:45:00
9	Zsolt Németh	0.29 s	Python 3	2024-05-28 03:27:17
10	Goh Teng Fong	0.29 s	Python 3	2025-02-18 10:00:05

#	User	Runtime	Language	Date
1	Hidden user	0.42 s	Ruby	2023-07-16 13:50:27

#	User	Runtime	Language	Date
1	Erik Magnusson	0.04 s	Rust	2024-01-31 15:32:18
2	Martin Söderman	0.06 s	Rust	2018-12-02 13:06:50
3	Daniel Anker Hermansen	0.06 s	Rust	2022-11-28 16:33:58

#	User	Length	Language	Date
1	Alexander Bilde Pedersen	1925	C	2025-11-16 21:24:58
2	Bergur Snorrason	2517	C	2020-12-18 12:34:46

#	User	Length	Language	Date
1	Ibrahim Abdulhussein	2056	C#	2018-12-02 13:04:52
2	Marek Gibek	2976	C#	2020-12-05 15:07:56
3	Loke Gustafsson	3232	C#	2018-12-01 14:58:20
4	Niklas Sandén	4372	C#	2018-12-02 00:50:06
5	Markus Swift	8165	C#	2018-11-30 20:02:52

#	User	Length	Language	Date
1	Evan Michael Bailey	724	C++	2024-02-18 16:40:02
2	Frederick Pek	782	C++	2022-02-08 16:23:59
3	Malte Kildelund Rosenkilde	855	C++	2021-05-30 10:31:31
4	Dmitry Lyubshin	880	C++	2023-03-28 08:57:10
5	Mohsen Mahroos	883	C++	2022-07-20 06:44:41
6	Leslie Yip	883	C++	2025-11-24 15:22:23
7	Matteo Zappia	928	C++	2021-09-16 23:30:36
8	Julian Berg-Larsen	937	C++	2026-01-01 15:08:46
9	Hidden user	945	C++	2020-12-12 16:59:04
10	Ron Ryvchin	952	C++	2023-02-02 15:32:40

#	User	Length	Language	Date
1	Norbert Voelker	2013	Go	2022-07-31 11:51:28

#	User	Length	Language	Date
1	Udo Stenzel	669	Haskell	2023-03-13 12:32:37
2	TJ Takei	3188	Haskell	2025-08-29 01:16:38
3	Brent Yorgey	3211	Haskell	2023-03-20 16:27:39
4	Fumiaki Takagi	4673	Haskell	2023-01-27 01:39:11

#	User	Length	Language	Date
1	Crystal Sharpe	1703	Java	2020-12-16 05:25:07
2	Doug Goodman	1993	Java	2021-07-21 15:16:36
3	Gary Gurlaskie	2370	Java	2022-04-30 01:56:18
4	Logan Pipes	2682	Java	2023-05-25 02:28:52
5	Carl Dybdahl	2809	Java	2021-03-26 17:01:05
6	Lars Corbijn	2867	Java	2021-11-06 19:57:28
7	Sawyer Stanley	3358	Java	2022-03-15 16:58:56
8	Kevin Lim Yong Shen	3674	Java	2022-02-09 04:52:28
9	Pim Agterberg	3930	Java	2022-06-28 16:37:29
10	Christtoffer Grrünberg	4099	Java	2024-02-11 20:59:46

#	User	Length	Language	Date
1	Jacob Huebner	2056	Kotlin	2021-10-16 01:19:01
2	Kate Eckhart	2094	Kotlin	2022-03-02 06:01:51

#	User	Length	Language	Date
1	Lars Åström	1316	Python 2	2018-11-30 00:44:53
2	Mateusz Drwal	1873	Python 2	2018-11-30 00:40:17

#	User	Length	Language	Date
1	Nicholas Russell Saerang	491	Python 3	2024-08-09 13:23:59
2	Oskar Haarklou Veileborg	585	Python 3	2021-04-06 14:15:20
3	Tai Tze Kin	622	Python 3	2025-02-18 06:19:44
4	Zsolt Németh	635	Python 3	2024-05-28 03:27:17
5	Hugo Eberhard	649	Python 3	2018-12-01 15:16:23
6	Thomas Meyer-Lehnert	658	Python 3	2022-05-20 19:44:04
7	Ole Vik Lysne	683	Python 3	2024-09-05 14:24:22
8	Jiayi Liu	704	Python 3	2025-11-13 11:00:47
9	Felix Steinberger Eriksson	726	Python 3	2022-04-30 04:12:45
10	Hidden user	728	Python 3	2023-06-21 16:59:53

#	User	Length	Language	Date
1	Hidden user	868	Ruby	2023-07-16 13:50:27

#	User	Length	Language	Date
1	Martin Söderman	1698	Rust	2018-12-02 13:06:50
2	Erik Magnusson	4436	Rust	2024-01-31 15:32:18
3	Daniel Anker Hermansen	14812	Rust	2022-11-28 16:33:58

Solution running time distribution