Problem A
Guess the Number — Problem Statistics

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Submissions	26337
Accepted submissions	6127
Submission ratio	23.26%
Authors	5527
Full solves [?]	4548
Full solve Ratio	82.29%

#	User	Runtime	Language	Date
1	Frans Meulenbroeks	0.01 s	Bash	2025-02-07 10:34:26
2	Chenzhang Hu	0.07 s	Bash	2023-11-13 17:02:15

#	User	Runtime	Language	Date
1	Joe Amenta	0.02 s	C#	2014-12-07 06:20:57
2	Mads Storm Hansen	0.02 s	C#	2015-07-20 22:50:27
3	Bas te Kolste	0.02 s	C#	2015-10-10 13:45:56
4	Andriy Zyevakov	0.02 s	C#	2015-10-14 18:25:16
5	Ugnius Skučas	0.02 s	C#	2016-10-15 14:35:47
6	Przemysław Curzytek	0.02 s	C#	2016-11-29 05:42:57
7	Klas af Geijerstam	0.02 s	C#	2016-12-05 20:21:57
8	Max Nylander	0.02 s	C#	2016-12-05 20:26:06
9	Erik Flink	0.02 s	C#	2017-03-22 14:55:29
10	Rasmus Brants	0.02 s	C#	2017-04-27 15:13:03

#	User	Runtime	Language	Date
1	David Cawthon	0.01 s	Common Lisp	2020-06-21 04:34:59
2	Ari Páll Agnarsson	0.01 s	Common Lisp	2021-02-08 02:39:16

#	User	Runtime	Language	Date
1	Einar Andri Víðisson	0.54 s	Elixir	2025-01-15 00:37:04

#	User	Runtime	Language	Date
1	Adam Ekelöf	0.02 s	F#	2021-03-02 16:15:26
2	Jacob Harris Cryer Kragh	0.02 s	F#	2023-04-22 09:28:03
3	Jesper Bengtson	0.04 s	F#	2021-09-09 00:12:48

#	User	Runtime	Language	Date
1	Kåre von Geijer	0.00 s	Go	2023-09-11 18:35:31
2	Annopdanai Pamarapa	0.00 s	Go	2024-02-15 04:32:42
3	Zachary Short	0.00 s	Go	2025-09-16 23:25:42
4	Vetle Håland Bergstad	0.01 s	Go	2019-01-14 16:32:08
5	Mikael Kolanowski	0.02 s	Go	2022-09-24 15:41:10
6	Yitian Wang	0.02 s	Go	2023-01-20 00:10:12
7	Hidden user	0.02 s	Go	2023-05-18 14:59:12
8	Alejandro Germain	0.07 s	Go	2018-10-11 12:37:27
9	Hidden user	0.07 s	Go	2018-10-20 13:52:42
10	Ainun Nazieb	0.07 s	Go	2020-09-24 16:39:21

#	User	Runtime	Language	Date
1	Einar Darri sveinbjörnsson	0.04 s	Java	2024-08-23 16:03:29
2	LI YUXUAN	0.04 s	Java	2024-08-26 11:21:21
3	Elias Hrafn Halldórsson	0.04 s	Java	2024-08-26 13:57:08
4	Víðir D. Krogsgaard	0.04 s	Java	2024-08-26 16:36:48
5	Ivan Ilanić	0.04 s	Java	2024-08-28 21:18:24
6	Wang Xiao Qi	0.04 s	Java	2024-08-30 07:56:03
7	Hidden user	0.04 s	Java	2024-09-04 13:20:19
8	Astrid Heath	0.04 s	Java	2024-09-19 16:19:50
9	Pham Minh Tuan Bui	0.04 s	Java	2024-10-30 01:39:47
10	Thanh Nhan Nguyen	0.04 s	Java	2024-10-31 22:46:35

#	User	Runtime	Language	Date
1	Tim Schumacher	0.04 s	JavaScript (Node.js)	2025-02-27 15:04:33
2	Ihor Kolisnyk	0.04 s	JavaScript (Node.js)	2025-09-02 17:50:04
3	Hjorvar Ingi Haraldsson	0.05 s	JavaScript (Node.js)	2019-02-18 12:50:15
4	Mathias Haugsbø	0.41 s	JavaScript (Node.js)	2020-02-01 11:50:36
5	Tony Baloney	0.42 s	JavaScript (Node.js)	2020-10-31 21:46:35
6	nandro	0.42 s	JavaScript (Node.js)	2020-11-19 00:21:13
7	programmer5000	0.42 s	JavaScript (Node.js)	2021-09-04 19:24:06
8	Nicklas Østerberg	0.42 s	JavaScript (Node.js)	2021-11-28 12:25:12
9	Jaan Jaerving	0.42 s	JavaScript (Node.js)	2022-01-10 11:57:40

#	User	Runtime	Language	Date
1	Bjarki Ágúst Guðmundsson	0.01 s	JavaScript (SpiderMonkey)	2014-07-31 21:11:16
2	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-01-16 17:14:10
3	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2016-02-21 16:22:42
4	Johannes Jensen	0.01 s	JavaScript (SpiderMonkey)	2016-03-06 17:00:52
5	Nguyễn Hùng Cường	0.02 s	JavaScript (SpiderMonkey)	2018-08-13 05:43:30
6	Jimmy Gustafsson	0.02 s	JavaScript (SpiderMonkey)	2022-06-09 21:51:32
7	Christian Pilegaard Cederquist	0.02 s	JavaScript (SpiderMonkey)	2023-01-30 14:10:42
8	Zach Tschetter	0.02 s	JavaScript (SpiderMonkey)	2023-04-17 02:18:27
9	Evan Magill	0.02 s	JavaScript (SpiderMonkey)	2024-09-08 06:39:47
10	Đậu Huy Minh	0.02 s	JavaScript (SpiderMonkey)	2025-09-12 11:33:15

#	User	Runtime	Language	Date
1	Jason Clarke	0.50 s	Julia	2024-02-10 11:26:35
2	Timothy Gaede	0.51 s	Julia	2024-06-18 04:05:58

#	User	Runtime	Language	Date
1	Thanh Le	0.11 s	Kotlin	2021-07-26 23:30:11
2	Hidden user	0.12 s	Kotlin	2018-01-16 17:11:50
3	Marcin Wiśniowski	0.14 s	Kotlin	2017-11-15 15:51:35
4	Dayan Ruben Gonzalez	0.14 s	Kotlin	2020-09-28 17:31:21
5	Håkon Kjelseth	0.16 s	Kotlin	2022-09-30 18:45:55
6	Adam Rankin	0.16 s	Kotlin	2023-05-08 22:41:28
7	Caden G	0.17 s	Kotlin	2019-10-29 02:37:36
8	Dmitry Shostak	0.17 s	Kotlin	2020-07-29 16:16:01
9	Anders B. Clausen	0.17 s	Kotlin	2020-10-31 11:46:10
10	Kristofer Sokk	0.17 s	Kotlin	2020-10-31 11:50:32

#	User	Runtime	Language	Date
1	Danny Robinson	0.00 s	Lua	2023-11-18 22:34:14
2	Zeheng Li	0.00 s	Lua	2023-12-13 00:26:59
3	Shinji Koshida	0.00 s	Lua	2025-04-04 14:34:24
4	Sander de Haan	0.00 s	Lua	2025-04-08 22:26:06
5	Peter Hairatidis	0.00 s	Lua	2025-09-16 23:11:19

#	User	Runtime	Language	Date
1	Hidden user	0.00 s	Nim	2025-05-20 10:43:45

#	User	Runtime	Language	Date
1	Constantijn Dekker	0.00 s	OCaml	2022-06-12 17:19:39
2	Simon Lavoie	0.00 s	OCaml	2024-09-22 21:46:06

#	User	Runtime	Language	Date
1	陳昱諺4B01 Chan Cory Yuk Yin	0.00 s	Pascal	2020-03-01 16:49:27
2	Stefan Schmiedl	0.00 s	Pascal	2025-05-17 23:19:45
3	Đậu Huy Minh	0.00 s	Pascal	2025-09-14 05:03:38

#	User	Runtime	Language	Date
1	Bjarki Ágúst Guðmundsson	0.01 s	PHP	2014-07-31 21:14:09
2	Sin V	0.01 s	PHP	2016-06-12 16:11:39
3	Morten Mehus	0.01 s	PHP	2018-01-16 15:44:05
4	Susanne Ragnemalm	0.01 s	PHP	2018-04-27 18:58:56
5	Jonas Lindenskov Nielsen	0.01 s	PHP	2019-10-15 14:28:34
6	Rodrigo Erazo Hermosilla	0.01 s	PHP	2020-11-22 08:41:52
7	Kasimir Cash	0.01 s	PHP	2024-02-28 12:37:49

#	User	Runtime	Language	Date
1	Daniel Krueger	0.02 s	Prolog	2021-09-04 21:49:35

#	User	Runtime	Language	Date
1	Christofer Ohlsson	0.02 s	Python 2	2015-05-24 19:54:36
2	Magnús Þór Benediktsson	0.02 s	Python 2	2015-05-28 18:59:47
3	Tore Norderud	0.02 s	Python 2	2015-09-20 02:05:44
4	Quan Huynh	0.02 s	Python 2	2015-09-21 10:32:58
5	Greg Hamerly	0.02 s	Python 2	2015-11-23 06:10:22
6	Chris Weston	0.02 s	Python 2	2016-02-23 17:55:16
7	Marko Lazic	0.02 s	Python 2	2016-07-25 16:53:47
8	Agis Daniels	0.02 s	Python 2	2017-01-24 22:53:35
9	Vahagn Altunyan	0.02 s	Python 2	2017-04-11 19:58:21
10	Anthony Sistilli	0.02 s	Python 2	2017-05-30 22:43:43

#	User	Runtime	Language	Date
1	Andri Már Sigurðsson	0.02 s	Python 3	2014-12-05 15:37:37
2	Amy Pandi	0.02 s	Python 3	2015-05-27 15:36:44
3	James Elías Sigurðarson	0.02 s	Python 3	2015-06-14 17:44:04
4	Adam Fazekas	0.02 s	Python 3	2015-10-10 08:13:18
5	Chris Kwiatkowski	0.02 s	Python 3	2016-03-03 02:49:55
6	Max Li	0.02 s	Python 3	2016-03-03 23:41:58
7	Magnus Thomé	0.02 s	Python 3	2016-04-18 21:21:04
8	William Fiset	0.02 s	Python 3	2016-05-18 00:13:55
9	Nathan Collins	0.02 s	Python 3	2016-06-13 22:53:50
10	Christian Lindeström	0.02 s	Python 3	2016-09-13 15:15:59

#	User	Runtime	Language	Date
1	Casper Christensen	0.03 s	Ruby	2016-03-03 20:59:55
2	Zohar Malamant	0.03 s	Ruby	2017-09-13 18:20:05
3	Jason Cheong-Kee-You	0.04 s	Ruby	2018-05-27 03:07:26
4	Hidden user	0.04 s	Ruby	2018-10-20 13:44:31
5	Macdara mac an tSionnaigh	0.04 s	Ruby	2019-10-29 00:44:54
6	Hidden user	0.04 s	Ruby	2019-10-30 21:47:06
7	Kieran Maharaj	0.05 s	Ruby	2020-07-02 14:56:54
8	Harry Zhang	0.06 s	Ruby	2022-12-25 08:57:02
9	Thomas Feld	0.06 s	Ruby	2023-01-11 16:14:04
10	Chenzhang Hu	0.06 s	Ruby	2024-02-06 16:59:30

#	User	Runtime	Language	Date
1	aglaé	0.00 s	Swift	2025-09-16 23:41:40

#	User	Length	Language	Date
1	Chenzhang Hu	60	Bash	2025-09-13 04:51:11
2	Frans Meulenbroeks	118	Bash	2025-02-07 10:46:34

#	User	Length	Language	Date
1	Hidden user	255	C	2014-11-23 15:31:38
2	Anthony Clark	322	C	2017-04-05 23:05:07
3	Raymond Yang	338	C	2021-06-25 23:25:16
4	Johan Öhlin	340	C	2017-06-27 10:49:46
5	Trym Rødvei	347	C	2019-01-16 06:20:35
6	Aron Bergman	365	C	2020-10-31 17:41:24
7	Leonardo Deliyannis Constantin	367	C	2019-04-02 01:14:45
8	Guðrún Herdís Arnarsdóttir	373	C	2022-01-12 16:38:43
9	Atli Fannar Franklín	373	C	2022-01-12 16:38:46
10	Ng Wei Jie	376	C	2020-02-17 21:47:17

#	User	Length	Language	Date
1	Michael Damsgaard	319	C#	2025-01-02 05:12:29
2	Johan Ahlrik	346	C#	2023-07-05 22:06:16
3	Alva Oskarsson	377	C#	2024-11-01 16:40:39
4	Marcellus Mohanna	389	C#	2020-05-08 22:43:44
5	Marek Bina	428	C#	2019-02-20 10:39:27
6	Rodrigo Erazo Hermosilla	478	C#	2020-11-22 08:54:40
7	Elias Böök	507	C#	2020-02-02 11:54:04
8	Carson Price	516	C#	2021-06-22 16:06:11
9	Thomas Norris	520	C#	2019-10-10 22:59:14
10	Amir hosein Hemmasi	556	C#	2021-02-15 21:21:29

#	User	Length	Language	Date
1	Frans Meulenbroeks	136	C++	2025-02-07 10:30:57
2	Tyler Fernando	159	C++	2023-06-21 07:13:49
3	Joseph Winkie	177	C++	2025-02-27 03:00:07
4	Angela Qian	183	C++	2025-09-16 20:28:28
5	Nathaniel McComas	186	C++	2022-11-19 00:06:39
6	OwO	219	C++	2021-01-27 18:50:36
7	Zakariae Elhamadani	223	C++	2025-04-12 04:28:22
8	Yu Ting Yeh	234	C++	2020-05-27 07:48:54
9	SIBO PENG	236	C++	2023-10-24 04:26:08
10	妹様万歳	237	C++	2020-03-19 09:00:36

#	User	Length	Language	Date
1	David Cawthon	429	Common Lisp	2020-06-21 04:34:59
2	Ari Páll Agnarsson	2219	Common Lisp	2021-02-08 02:39:16

#	User	Length	Language	Date
1	Einar Andri Víðisson	581	Elixir	2025-01-15 00:37:04

#	User	Length	Language	Date
1	Adam Ekelöf	284	F#	2021-03-02 15:58:35
2	Jacob Harris Cryer Kragh	389	F#	2023-04-22 09:28:03
3	Jesper Bengtson	1951	F#	2021-09-09 00:12:48

#	User	Length	Language	Date
1	Hidden user	241	Go	2018-10-20 13:52:42
2	Adrian Borup	304	Go	2021-09-09 13:42:57
3	Adrian Bay Dorph	310	Go	2021-09-04 00:42:29
4	John William O'Rourke	313	Go	2017-09-19 21:59:03
5	Lukas L. Hjelmstrand	324	Go	2021-09-09 18:01:13
6	Ainun Nazieb	328	Go	2020-09-24 16:39:21
7	Joachim Borup	330	Go	2021-09-09 09:02:48
8	Adam Ekelöf	337	Go	2021-03-05 13:42:35
9	Hidden user	360	Go	2021-09-13 23:01:13
10	Jonas Hedin	365	Go	2015-02-28 16:05:27

#	User	Length	Language	Date
1	Hidden user	234	Haskell	2018-01-16 12:30:37
2	David Wärn	237	Haskell	2015-06-01 13:14:21
3	Alessandro Bruni	270	Haskell	2021-08-31 12:49:24
4	Joe Little	283	Haskell	2024-10-24 13:24:24
5	Alexander Wahlsten	292	Haskell	2022-09-11 19:00:17
6	David Bergström	297	Haskell	2025-09-02 18:00:16
7	Ragnhild Aalvik	301	Haskell	2018-01-16 16:20:25
8	Stian	329	Haskell	2020-01-13 17:10:06
9	Tim Finnetey	334	Haskell	2020-09-24 15:48:39
10	Jørn Lode	340	Haskell	2020-10-31 11:27:34

#	User	Length	Language	Date
1	John Hershey	302	Java	2024-09-06 17:02:13
2	Ricardo Ruiz	366	Java	2022-09-03 16:06:57
3	Doug Goodman	377	Java	2017-12-15 23:05:52
4	Adam Abdalla	394	Java	2017-08-13 21:11:41
5	Vikas Kushwaha	407	Java	2015-07-08 13:56:38
6	Einar Þór Ívarsson	415	Java	2020-01-10 17:53:55
7	Sơn Phạm Huỳnh	420	Java	2018-08-13 05:21:00
8	Joshua Fair	425	Java	2019-03-22 14:46:39
9	Hidden user	426	Java	2019-11-20 21:08:15
10	Seth Behar	427	Java	2020-07-21 01:45:52

#	User	Length	Language	Date
1	Jaan Jaerving	436	JavaScript (Node.js)	2022-01-10 11:57:40
2	Nicklas Østerberg	457	JavaScript (Node.js)	2021-11-28 12:25:12
3	Mathias Haugsbø	521	JavaScript (Node.js)	2020-02-01 11:50:36
4	Hjorvar Ingi Haraldsson	566	JavaScript (Node.js)	2019-02-18 12:50:15
5	Ihor Kolisnyk	572	JavaScript (Node.js)	2025-09-02 17:50:04
6	Tony Baloney	688	JavaScript (Node.js)	2020-10-31 21:46:35
7	nandro	721	JavaScript (Node.js)	2020-11-19 00:21:13
8	programmer5000	784	JavaScript (Node.js)	2021-09-04 19:24:06
9	Tim Schumacher	1633	JavaScript (Node.js)	2025-02-27 15:04:33

#	User	Length	Language	Date
1	Jimmy Gustafsson	125	JavaScript (SpiderMonkey)	2024-06-18 00:25:18
2	Zach Tschetter	200	JavaScript (SpiderMonkey)	2023-04-17 02:18:27
3	Đậu Huy Minh	203	JavaScript (SpiderMonkey)	2025-09-12 11:33:15
4	Christian Pilegaard Cederquist	251	JavaScript (SpiderMonkey)	2023-01-30 14:10:42
5	Bjarki Ágúst Guðmundsson	256	JavaScript (SpiderMonkey)	2014-07-31 21:11:16
6	Johannes Jensen	268	JavaScript (SpiderMonkey)	2016-03-06 17:00:52
7	Peter Kedemo	277	JavaScript (SpiderMonkey)	2016-02-21 16:22:42
8	Bjørn Chr. Soltvedt	326	JavaScript (SpiderMonkey)	2016-01-16 17:14:10
9	Nguyễn Hùng Cường	358	JavaScript (SpiderMonkey)	2018-08-13 05:43:30
10	Evan Magill	364	JavaScript (SpiderMonkey)	2024-09-08 06:39:47

#	User	Length	Language	Date
1	Jason Clarke	299	Julia	2024-02-10 11:26:35
2	Timothy Gaede	336	Julia	2024-06-18 04:03:00

#	User	Length	Language	Date
1	Vegard Itland	290	Kotlin	2019-01-28 23:46:37
2	Dmitry Shostak	291	Kotlin	2020-07-29 16:16:01
3	Kristofer Sokk	338	Kotlin	2020-10-31 11:50:32
4	Anders B. Clausen	358	Kotlin	2020-10-31 11:46:10
5	Chris Johnson	371	Kotlin	2023-09-25 23:28:16
6	Lewis Johnson	371	Kotlin	2023-09-25 23:41:22
7	Sergey Jakobsen	374	Kotlin	2021-08-24 13:58:04
8	Håkon Kjelseth	411	Kotlin	2022-09-30 18:45:55
9	Adam Rankin	418	Kotlin	2023-05-08 22:41:28
10	Isaac Owomugisha	422	Kotlin	2019-11-06 19:23:57

#	User	Length	Language	Date
1	Danny Robinson	108	Lua	2023-11-18 22:58:51
2	Sander de Haan	163	Lua	2025-04-08 22:44:35
3	Shinji Koshida	231	Lua	2025-04-04 14:34:24
4	Zeheng Li	240	Lua	2023-12-13 00:26:59
5	Peter Hairatidis	564	Lua	2025-09-16 23:11:19

#	User	Length	Language	Date
1	Hidden user	185	Nim	2025-05-20 10:43:45

#	User	Length	Language	Date
1	Simon Lavoie	373	OCaml	2024-09-22 21:46:06
2	Constantijn Dekker	456	OCaml	2022-06-12 17:19:39

#	User	Length	Language	Date
1	陳昱諺4B01 Chan Cory Yuk Yin	276	Pascal	2020-03-01 16:49:27
2	Đậu Huy Minh	513	Pascal	2025-09-14 05:03:38
3	Stefan Schmiedl	820	Pascal	2025-05-17 23:19:45

#	User	Length	Language	Date
1	Kasimir Cash	304	PHP	2024-02-28 12:55:37
2	Susanne Ragnemalm	306	PHP	2018-04-27 18:58:56
3	Bjarki Ágúst Guðmundsson	307	PHP	2014-07-31 21:14:09
4	Sin V	411	PHP	2016-06-12 16:11:39
5	Rodrigo Erazo Hermosilla	432	PHP	2020-11-22 08:41:52
6	Morten Mehus	486	PHP	2018-01-16 15:44:05
7	Jonas Lindenskov Nielsen	773	PHP	2019-10-15 14:28:34

#	User	Length	Language	Date
1	Daniel Krueger	1069	Prolog	2021-09-04 21:49:35

#	User	Length	Language	Date
1	Thomas Feld	128	Python 2	2019-08-16 14:48:41
2	Johan Lyts	162	Python 2	2019-12-25 21:16:49
3	Toy Wang	164	Python 2	2017-11-15 15:28:44
4	Paulo Bu	173	Python 2	2015-02-18 12:04:01
5	Quan Huynh	182	Python 2	2015-09-21 10:32:58
6	Chris Weston	182	Python 2	2016-02-23 17:55:16
7	Eoin Davey	182	Python 2	2017-08-08 14:47:12
8	Vahagn Altunyan	183	Python 2	2017-04-11 19:58:21
9	Dagur Benjamínsson	194	Python 2	2023-08-18 03:47:52
10	Andreas Björklund	195	Python 2	2019-12-26 09:39:38

#	User	Length	Language	Date
1	Sarek Høverstad Skotåm	83	Python 3	2022-09-30 23:32:52
2	Per-Ivar Faust	83	Python 3	2023-09-15 12:38:04
3	Kevin Yu	91	Python 3	2023-09-16 23:16:10
4	Alex Lai	96	Python 3	2023-09-16 07:16:27
5	Felis Sedano Luo Yi	96	Python 3	2023-09-16 09:28:17
6	Harry Zhang	99	Python 3	2024-02-14 17:02:47
7	Joel Niemelä	107	Python 3	2025-06-04 06:53:14
8	Sterling Smith	112	Python 3	2025-03-25 23:37:31
9	Charles Ancheta	115	Python 3	2023-04-15 04:31:47
10	Fredrik Niemelä	118	Python 3	2025-09-11 21:15:53

#	User	Length	Language	Date
1	Thomas Feld	47	Ruby	2023-05-15 10:46:34
2	Chenzhang Hu	51	Ruby	2024-04-14 09:40:13
3	Harry Zhang	149	Ruby	2022-12-25 08:57:02
4	Hidden user	189	Ruby	2018-10-20 13:44:31
5	Zohar Malamant	190	Ruby	2018-01-16 15:04:28
6	Gustav Kalander	193	Ruby	2025-06-02 10:19:30
7	Erik Magnusson	194	Ruby	2025-06-02 12:13:39
8	Hidden user	205	Ruby	2019-10-30 21:47:06
9	Macdara mac an tSionnaigh	252	Ruby	2019-10-29 00:44:54
10	Malte Östling	252	Ruby	2025-06-02 12:19:06

#	User	Length	Language	Date
1	Samuel Kyletoft	401	Rust	2020-06-19 01:21:59
2	Andrzej Wasowski	444	Rust	2021-09-14 10:46:41
3	Joe Blower	446	Rust	2025-06-07 03:55:28
4	Zachary DeStefano	480	Rust	2024-07-09 00:18:25
5	Mattias Davidsson	508	Rust	2023-09-23 22:14:55
6	Viktor Valastin	510	Rust	2020-01-20 18:55:15
7	Serguei Antonovich Kirillov	513	Rust	2019-05-12 23:07:55
8	Jon Pacheco	542	Rust	2018-11-04 13:37:58
9	Hidden user	543	Rust	2022-11-16 21:39:06
10	Vincent Lagerros	557	Rust	2024-04-05 22:19:53

#	User	Length	Language	Date
1	aglaé	632	Swift	2025-09-16 23:41:40

Solution running time distribution