Problem A
Catalan Square — Problem Statistics

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Submissions	2333
Accepted submissions	1139
Submission ratio	48.82%
Authors	954
Full solves [?]	856
Full solve Ratio	89.73%

#	User	Runtime	Language	Date
1	Chenzhang Hu	0.10 s	Bash	2024-02-05 14:03:26

#	User	Runtime	Language	Date
1	Mirel Cosulschi	0.01 s	C	2024-11-10 15:57:06
2	Ivan Petrov	0.23 s	C	2019-10-15 11:47:56

#	User	Runtime	Language	Date
1	Gabriel Garcia	0.03 s	C#	2015-08-09 16:31:23
2	Brian Scott	0.04 s	C#	2018-09-13 15:29:49
3	Khugan Shanmugeswaran	0.05 s	C#	2015-09-30 04:04:28
4	Arnar Bjarni Arnarson	0.05 s	C#	2015-10-12 04:50:08
5	Tilen	0.05 s	C#	2016-11-25 18:51:22
6	Joel Keleta	0.05 s	C#	2019-09-16 12:53:33
7	masosz	0.06 s	C#	2015-03-20 17:55:00
8	Marcin Nowak	0.15 s	C#	2014-10-06 08:49:50
9	Roxanne Baker	0.23 s	C#	2017-12-11 20:50:56
10	Michael Damsgaard	0.31 s	C#	2025-01-11 15:16:48

#	User	Runtime	Language	Date
1	Johnny Ho	0.00 s	C++	2015-03-14 18:28:00
2	Evan Michael Bailey	0.00 s	C++	2023-07-21 16:06:53
3	Emanuele Rossi	0.01 s	C++	2015-10-09 14:25:02
4	SiBi	0.01 s	C++	2019-04-25 04:02:30
5	Xi Yi	0.02 s	C++	2015-03-14 20:36:03
6	Alex Yao	0.02 s	C++	2016-03-22 20:04:20
7	YanHao Ling	0.02 s	C++	2018-04-19 13:24:56
8	Nita Ray	0.02 s	C++	2019-09-23 02:54:54
9	Norman Putra	0.02 s	C++	2025-11-22 15:11:44
10	Naga Manikanta Chama	0.03 s	C++	2018-11-11 01:34:17

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.21 s	F#	2023-09-20 16:12:03

#	User	Runtime	Language	Date
1	Iker Lissarrague	0.04 s	Go	2023-10-03 17:56:44
2	Kurtis Van Gent	0.08 s	Go	2019-01-25 03:43:21
3	Metin Gülseven	0.08 s	Go	2019-03-12 13:41:56
4	Norbert Voelker	0.08 s	Go	2021-11-06 19:06:52
5	Gabriel Garcia	0.09 s	Go	2015-08-10 02:09:49
6	Ahmed Bihi	0.09 s	Go	2017-03-13 19:24:48
7	Markus Weller	0.09 s	Go	2019-03-28 12:42:20

#	User	Runtime	Language	Date
1	Gabriel Garcia	0.00 s	Haskell	2015-08-09 15:11:33
2	David Wärn	0.01 s	Haskell	2015-05-20 07:49:43
3	Joakim Blikstad	0.01 s	Haskell	2015-05-27 13:28:34
4	Lukas Polacek	0.01 s	Haskell	2015-07-09 19:03:09
5	Lars Tveito	0.01 s	Haskell	2016-09-11 22:52:36
6	Abel Martin	0.01 s	Haskell	2017-03-12 10:50:29
7	Brent Yorgey	0.01 s	Haskell	2017-11-04 16:00:33
8	Qi Ji	0.01 s	Haskell	2019-02-23 17:31:02
9	Aurélien Pepin	0.01 s	Haskell	2019-09-21 11:51:45
10	Josenildo Silva	0.02 s	Haskell	2017-01-04 18:05:51

#	User	Runtime	Language	Date
1	Sven Rönnbäck	0.06 s	Java	2025-02-09 10:11:46
2	Marco Vincenzo Karaan	0.10 s	Java	2015-09-19 07:09:15
3	Russelle Guadalupe	0.10 s	Java	2015-09-27 09:26:17
4	Martijn Muijsers	0.10 s	Java	2017-03-11 16:20:22
5	Anurag Datta	0.10 s	Java	2025-12-10 23:55:32
6	How Si Wei	0.11 s	Java	2016-03-11 01:22:43
7	Ryan Alexander	0.11 s	Java	2016-03-22 13:51:37
8	Simon Xue	0.11 s	Java	2016-04-12 00:55:55
9	Joshua Kirstein	0.12 s	Java	2015-03-14 17:15:48
10	Jeremy Archer	0.12 s	Java	2015-03-14 18:24:20

#	User	Runtime	Language	Date
1	Bas Dirks	0.06 s	JavaScript (Node.js)	2024-01-01 19:30:10

#	User	Runtime	Language	Date
1	Christian Pilegaard Cederquist	0.04 s	JavaScript (SpiderMonkey)	2023-04-07 06:05:51

#	User	Runtime	Language	Date
1	Timothy Gaede	0.66 s	Julia	2024-04-22 01:41:57

#	User	Runtime	Language	Date
1	Adam Rankin	0.25 s	Kotlin	2023-10-21 17:36:58
2	Hidden user	0.27 s	Kotlin	2017-12-12 07:36:11
3	Przemysław Curzytek	0.27 s	Kotlin	2017-12-12 07:38:56
4	Benjamin Laurence Erickson	0.27 s	Kotlin	2019-01-22 20:37:25
5	Jacob Huebner	0.28 s	Kotlin	2020-04-20 22:59:27
6	Hidden user	0.64 s	Kotlin	2020-05-06 06:22:17

#	User	Runtime	Language	Date
1	Hidden user	0.03 s	Python 2	2014-10-04 11:18:45
2	Tore Norderud	0.03 s	Python 2	2014-12-18 13:16:14
3	Mike Simister	0.03 s	Python 2	2015-03-14 21:39:03
4	Gabriel Garcia	0.03 s	Python 2	2015-08-09 22:11:33
5	Nick Wu	0.03 s	Python 2	2015-10-17 06:27:19
6	Frederik Højholt	0.03 s	Python 2	2015-10-25 15:04:04
7	Filip Haglund	0.03 s	Python 2	2015-11-23 17:53:43
8	Timothy Kurniawan	0.03 s	Python 2	2016-10-22 12:36:04
9	Rhys Balevicius	0.03 s	Python 2	2017-10-31 05:58:02
10	Herbert Ilhan Tanujaya	0.03 s	Python 2	2019-03-21 13:06:46

#	User	Runtime	Language	Date
1	Gabriel Garcia	0.02 s	Python 3	2015-08-09 22:05:19
2	Hidden user	0.02 s	Python 3	2015-09-16 15:43:16
3	Hidden user	0.02 s	Python 3	2016-05-11 17:41:01
4	Nathan Collins	0.02 s	Python 3	2016-05-15 16:46:13
5	Linus Eklund	0.02 s	Python 3	2016-05-23 20:00:57
6	Herman Karlsson	0.02 s	Python 3	2016-12-29 12:52:18
7	Josenildo Silva	0.02 s	Python 3	2017-01-04 18:09:53
8	Federico Glaudo	0.02 s	Python 3	2017-09-28 22:13:28
9	Gabe Ambrosio	0.02 s	Python 3	2018-04-28 14:18:53
10	Isaac Saffold	0.02 s	Python 3	2018-04-29 04:14:29

#	User	Runtime	Language	Date
1	Casper Christensen	0.05 s	Ruby	2016-02-13 13:45:24
2	Lee Tze Han	0.06 s	Ruby	2018-06-28 09:58:57
3	Thomas Feld	0.07 s	Ruby	2023-01-02 12:31:59
4	Yung-Luen Lan	0.08 s	Ruby	2016-08-03 00:42:21
5	Miorel Palii	0.09 s	Ruby	2017-12-27 20:03:44
6	Hidden user	0.10 s	Ruby	2019-06-24 09:47:48
7	Chenzhang Hu	0.15 s	Ruby	2025-09-22 12:50:25

#	User	Length	Language	Date
1	Chenzhang Hu	59	Bash	2025-09-13 16:06:38

#	User	Length	Language	Date
1	Ivan Petrov	1344	C	2019-10-15 11:47:56
2	Mirel Cosulschi	1860	C	2024-11-10 15:57:06

#	User	Length	Language	Date
1	Brian Scott	372	C#	2018-09-13 15:29:49
2	Joel Keleta	658	C#	2019-09-16 12:53:33
3	Arnar Bjarni Arnarson	735	C#	2015-10-12 04:50:08
4	Eugene Baranov	747	C#	2016-09-21 21:50:36
5	Tilen	776	C#	2016-11-25 18:51:22
6	Gabriel Garcia	814	C#	2015-08-10 01:00:12
7	Marcin Nowak	850	C#	2014-10-06 08:49:50
8	Michael Damsgaard	1053	C#	2025-01-11 15:16:48
9	Mads Storm Hansen	1073	C#	2015-07-22 20:19:02
10	Kalyan Balla	1276	C#	2015-11-03 22:53:30

#	User	Length	Language	Date
1	Xi Yi	881	C++	2015-03-14 20:36:03
2	SiBi	881	C++	2019-04-25 04:02:30
3	Liyiming Ke	943	C++	2015-10-16 19:35:47
4	Alexander Skidanov	1028	C++	2024-11-09 11:47:43
5	Emanuele Rossi	1141	C++	2015-10-09 14:25:02
6	Yujie An	1152	C++	2016-11-12 15:40:11
7	InDI2k	1178	C++	2025-01-09 06:39:02
8	Johnny Ho	1289	C++	2015-03-14 18:28:00
9	Evan Michael Bailey	1331	C++	2023-07-21 16:06:53
10	Hidden user	1371	C++	2025-11-13 15:42:43

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	504	F#	2023-09-20 16:12:03

#	User	Length	Language	Date
1	Metin Gülseven	278	Go	2019-03-12 13:41:56
2	Markus Weller	403	Go	2019-03-28 12:42:20
3	Norbert Voelker	515	Go	2021-11-06 19:06:52
4	Kurtis Van Gent	614	Go	2019-01-25 03:43:21
5	Iker Lissarrague	686	Go	2023-10-03 17:56:44
6	Gabriel Garcia	688	Go	2015-08-10 02:29:22
7	Ahmed Bihi	999	Go	2017-03-13 19:24:48

#	User	Length	Language	Date
1	Joakim Blikstad	88	Haskell	2015-05-27 13:29:44
2	David Wärn	92	Haskell	2015-05-20 07:49:43
3	Gabriel Garcia	132	Haskell	2015-08-09 03:53:43
4	Lukas Polacek	142	Haskell	2015-07-09 19:03:09
5	Qi Ji	177	Haskell	2019-02-23 17:31:02
6	Klas af Geijerstam	187	Haskell	2020-02-28 07:47:59
7	Lars Tveito	194	Haskell	2016-09-11 22:52:36
8	Jannik Olbrich	200	Haskell	2019-07-07 12:16:57
9	Paul Wild	225	Haskell	2018-09-01 22:26:36
10	Diego Pedraza	292	Haskell	2017-03-14 16:58:33

#	User	Length	Language	Date
1	Og Astorga Diaz	406	Java	2015-11-10 20:41:13
2	Justin D. Cheng	410	Java	2017-11-09 03:25:28
3	Maria Regina Santos de Deus	410	Java	2018-06-10 00:34:51
4	Sam Reinehr	417	Java	2017-10-14 16:44:52
5	Hidden user	428	Java	2018-06-10 00:35:22
6	Evan Michael Bailey	434	Java	2021-05-08 17:20:37
7	Hu Wenyan	452	Java	2017-03-17 12:37:24
8	Markus Wrang	460	Java	2019-05-12 00:13:57
9	William Gan	472	Java	2017-02-22 12:25:05
10	손상준	475	Java	2015-11-14 06:21:00

#	User	Length	Language	Date
1	Bas Dirks	508	JavaScript (Node.js)	2024-01-01 19:30:10

#	User	Length	Language	Date
1	Christian Pilegaard Cederquist	130	JavaScript (SpiderMonkey)	2023-04-07 06:05:51

#	User	Length	Language	Date
1	Timothy Gaede	574	Julia	2024-04-22 01:41:57

#	User	Length	Language	Date
1	Jacob Huebner	357	Kotlin	2020-04-20 22:59:27
2	Adam Rankin	371	Kotlin	2023-10-21 17:36:58
3	Benjamin Laurence Erickson	472	Kotlin	2019-01-22 20:37:25
4	Hidden user	556	Kotlin	2020-05-06 06:22:17
5	Hidden user	2629	Kotlin	2017-12-12 07:36:11
6	Przemysław Curzytek	2629	Kotlin	2017-12-12 07:38:56

#	User	Length	Language	Date
1	Filip Haglund	72	Python 2	2016-10-02 12:01:09
2	Sigurður Jens Albertsson	95	Python 2	2017-12-13 22:55:48
3	Hidden user	97	Python 2	2014-10-06 10:38:28
4	Cherim	99	Python 2	2017-11-01 15:46:38
5	Maru Chan	109	Python 2	2018-03-24 20:44:57
6	Eoin Davey	110	Python 2	2017-10-17 23:20:28
7	Andreas Eisele	112	Python 2	2018-09-13 08:57:34
8	Peter Beattie	116	Python 2	2017-12-08 16:06:45
9	Johan Sannemo	120	Python 2	2014-11-21 20:13:55
10	Neal Zane	122	Python 2	2015-12-27 06:33:19

#	User	Length	Language	Date
1	Shashank Bhatt	57	Python 3	2023-05-07 22:39:40
2	Clement Oh	57	Python 3	2023-05-31 08:09:17
3	Lee Isaac	59	Python 3	2022-11-12 19:26:37
4	Benjamin Z White	59	Python 3	2023-05-16 10:56:20
5	Lennart Meyling	59	Python 3	2024-08-11 01:40:46
6	Peter Stauder	62	Python 3	2022-11-12 20:49:11
7	Tam Keng Hong	63	Python 3	2023-01-05 17:36:07
8	Guillermo Hernández	65	Python 3	2023-12-31 14:32:52
9	udiandianis	66	Python 3	2024-03-24 09:28:26
10	Niklas Sandén	68	Python 3	2022-09-29 16:59:33

#	User	Length	Language	Date
1	Thomas Feld	44	Ruby	2023-01-02 12:31:59
2	Casper Christensen	141	Ruby	2016-02-13 13:45:24
3	Yung-Luen Lan	144	Ruby	2016-08-03 00:42:21
4	Chenzhang Hu	161	Ruby	2025-09-22 12:50:25
5	Miorel Palii	188	Ruby	2017-12-27 20:03:44
6	Lee Tze Han	219	Ruby	2018-06-28 09:58:57
7	Hidden user	242	Ruby	2019-06-24 09:47:48

Solution running time distribution