Combinatorics

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Solve 10 problems on Combinatorics topic.

# User Unlock date Country XP
159 momohuang Aug. 7, 2013, 8:51 a.m.   37
158 natan.holtzman Aug. 1, 2013, 9:31 p.m.   42
157 Matija Folnovic July 29, 2013, 8:33 p.m. 42
156 Sabino Colonna July 28, 2013, 10:20 a.m. 96
155 kseniya.muratova July 26, 2013, 5:14 p.m.   43
154 Luiz Irber July 25, 2013, 8:19 p.m. 116
153 akso July 24, 2013, 10:49 p.m.   58
152 Radosław Luter July 23, 2013, 11:27 a.m. 40
151 Victoria Benstead-Hume July 20, 2013, 3:37 p.m. 80
150 Iva Miholić July 16, 2013, 9:56 p.m. 36
149 verdandi July 12, 2013, 3:29 p.m. 64
148 Max Hume July 11, 2013, 12:50 a.m. 61
147 Andrey Beloborodov July 7, 2013, 1:27 p.m. 40
146 Stewart Watts July 5, 2013, 8:07 p.m. 64
145 Jonathan Goodwin July 4, 2013, 8:14 p.m.   39
144 anton_klimov July 4, 2013, 10:39 a.m.   27
143 antimatter July 1, 2013, 1:17 a.m.   67
142 mmmnnmn July 1, 2013, 12:53 a.m.   40
141 Alexander Zhernakov June 30, 2013, 10:44 a.m.   30
140 Anna Pologova June 24, 2013, 2:52 p.m.   49
139 MinW June 24, 2013, 6:37 a.m. 79
138 Eishkimo June 16, 2013, 1:30 a.m.   95
137 Gianluca June 12, 2013, 2:29 p.m. 69
136 Conor Lazarou June 11, 2013, 8:22 p.m. 113
135 Ruhshan Ahmed Abir June 11, 2013, 6:24 p.m. 164
134 Nick Travers June 11, 2013, 5:54 a.m. 58
133 hrvoje June 9, 2013, 4:44 p.m. 38
132 Pathfinder June 7, 2013, 4:42 a.m. 71
131 guomulian June 6, 2013, 8:52 a.m.   51
130 Eric Hokamp June 5, 2013, 10:30 p.m. 74
129 Vadim N. June 5, 2013, 12:16 p.m.   76
128 Carlos Joa June 5, 2013, 2:41 a.m. 35
127 Evgeny Rokhlin June 1, 2013, 11:44 a.m. 92
126 Brett Baillie June 1, 2013, 5:12 a.m. 59
125 Sergey Musienko May 29, 2013, 1:21 p.m. 37
124 c_kyle May 27, 2013, 9:15 p.m. 63
123 Jim Chen May 27, 2013, 7:20 a.m. 49
122 Mathias Hörtnagl May 24, 2013, 11:38 p.m. 46
121 loick.michard May 23, 2013, 11:22 a.m. 49
120 Justin Poliey May 21, 2013, 7:56 p.m. 46
119 Chris Davoren May 19, 2013, 7:04 a.m. 39
118 Dmitry Filippov May 17, 2013, 4:48 p.m. 43
117 Gaeowyn May 14, 2013, 4:03 p.m.   48
116 jfunt May 13, 2013, 9:50 p.m. 42
115 emmahe May 4, 2013, 4:18 p.m. 71
114 Daniel E. Cook May 3, 2013, 11:29 p.m. 52
113 Fedintsev Alexander May 3, 2013, 7 a.m. 53
112 Tyler Hyndman May 3, 2013, 5:35 a.m. 58
111 SzB May 2, 2013, 2:26 p.m. 57
110 David Völgyes May 1, 2013, 5:46 p.m. 109
109 Xiaoli Wu May 1, 2013, 2:10 a.m. 35
108 entropicdragon April 30, 2013, 9:25 p.m. 55
107 farful April 29, 2013, 12:57 p.m.   45
106 Boris April 29, 2013, 11:20 a.m. 46
105 Don Vo April 26, 2013, 3:15 p.m. 35
104 Eric Fu April 26, 2013, 12:24 a.m. 62
103 Eduardo Ferreira April 24, 2013, 1:39 p.m. 41
102 Laperche Sylvain April 23, 2013, 1:26 p.m. 79
101 Serj Ivanov April 21, 2013, 5:01 p.m.   39
100 Shrikant Sharat Kandula April 20, 2013, 3:21 p.m. 63
99 Timofey Bondarev April 20, 2013, 2:21 p.m. 73
98 ing. i. April 19, 2013, 7:17 p.m. 46
97 simplice.dolce April 18, 2013, 9:07 a.m.   76
96 Kevin Ushey April 16, 2013, 6:04 a.m.   49
95 Gryte Satas April 16, 2013, 1:20 a.m.   49
94 Anastasia Sirotenko April 13, 2013, 6:19 p.m. 71
93 Katya Gordienko April 12, 2013, 6:40 p.m. 56
92 Dima Gerasimov April 11, 2013, 9:32 p.m. 53
91 Haizan April 11, 2013, 6:11 p.m. 37
90 TheRedBerrys April 8, 2013, 6 p.m.   65
89 Caio Padoan de Sá Godinho April 6, 2013, 12:13 p.m. 43
88 Paulo VJ April 3, 2013, 7:38 p.m. 64
87 Andrea Giancola April 2, 2013, 9:23 a.m. 55
86 Tom Gustafson April 1, 2013, 8:51 p.m. 70
85 popww1 March 31, 2013, 9:02 p.m.   49
84 Jian Li March 31, 2013, 6:53 p.m.   39
83 Jakub Bartczuk March 30, 2013, 7:37 p.m. 65
82 Daniel Horton March 28, 2013, 6:21 p.m.   72
81 Jaideva March 27, 2013, 5:57 p.m. 66
80 ettdizzle March 27, 2013, 5:34 p.m.   38
79 Jason Wang March 26, 2013, 2:45 p.m. 69
78 Tomek Stachowiak March 23, 2013, 1:02 p.m. 71
77 bioiu-li63 March 22, 2013, 9:22 p.m.   36
76 Lolo D. March 21, 2013, 9:09 p.m. 46
75 Youngtae Youn March 20, 2013, 10:22 p.m. 129
74 Xinhui ZENG March 19, 2013, 1:54 a.m. 71
73 Nicolas Aumar March 17, 2013, 9:53 p.m. 85
72 Lee Baker March 16, 2013, 7:06 p.m. 89
71 xpan March 14, 2013, 6:53 a.m. 62
70 Moroccan Coder March 11, 2013, 10:31 p.m. 52
69 Jacob Statnekov March 11, 2013, 6:14 a.m. 52
68 pradeep n. kumbhar March 10, 2013, 9:57 a.m. 144
67 Freek de Bruijn March 9, 2013, 10:40 p.m. 50
66 Sherlock Holmes March 9, 2013, 7:48 p.m. 57
65 Ayiko March 8, 2013, 3:22 p.m. 50
64 ryminai March 8, 2013, 12:59 p.m.   57
63 Guillaume Collet March 8, 2013, 10:54 a.m. 85
62 Un Pau March 7, 2013, 10:44 p.m. 61
61 Victor Lyuboslavsky March 7, 2013, 2:26 a.m. 48
60 Mitchell Szczepanczyk March 7, 2013, 12:15 a.m. 38
59 Andrzej Religa March 5, 2013, 10:36 p.m. 70
58 Yuehang Chen March 5, 2013, 2:42 p.m. 56
57 qilu March 4, 2013, 11:30 a.m. 48
56 traws Feb. 28, 2013, 2:14 p.m. 61
55 Adrian Feb. 26, 2013, 5:56 p.m. 61
54 Denis Kreshikhin Feb. 24, 2013, 7:10 p.m. 46
53 Jason Harris Feb. 24, 2013, 5:36 a.m. 45
52 Simon Gladman Feb. 23, 2013, 4:32 a.m. 63
51 Stanislaw Pitucha Feb. 8, 2013, 11:54 p.m. 66
50 fleandr Jan. 29, 2013, 11:22 a.m. 60
49 Sergey Aganezov Jan. 25, 2013, 1:10 p.m. 66
48 Pedro Pedrosa Jan. 17, 2013, 10:53 p.m. 68
47 Demidenko Vitaly Jan. 17, 2013, 2:45 p.m. 59
46 xcode Jan. 17, 2013, 2:22 p.m. 47
45 blabla404 Jan. 16, 2013, 4:18 p.m. 71
44 Luke McEvoy Jan. 16, 2013, 6:13 a.m. 62
43 João Pedro Silva Jan. 11, 2013, 11:27 p.m. 73
42 Andrew Taylor Jan. 11, 2013, 9:32 p.m. 51
41 jdherg Jan. 10, 2013, 8:11 a.m.   57
40 Vasilis Fatouros Jan. 8, 2013, 8:14 a.m.   51
39 Mikhail Ksenzov Jan. 6, 2013, 5:42 p.m. 68
38 oleg.strikov Jan. 3, 2013, 4:35 p.m.   41
37 Bernie Pope Dec. 31, 2012, 6:09 a.m. 53
36 Thomas Edvalson Dec. 29, 2012, 9:23 p.m. 56
35 Saleem Shafi Dec. 28, 2012, 5:55 p.m. 62
34 tima Dec. 27, 2012, 2:05 p.m. 87
33 yesimon Dec. 24, 2012, 9:15 p.m. 68
32 Tim.MacEachern Dec. 23, 2012, 6:34 p.m. 48
31 Artem Tarasov Dec. 22, 2012, 4:13 p.m. 52
30 Matthew Cook Dec. 19, 2012, 9:01 a.m. 81
29 Paul Bazin Dec. 19, 2012, 7:45 a.m. 82
28 Marcus van Ierssel Dec. 18, 2012, 6:10 a.m. 71
27 Steve Hunter Dec. 11, 2012, 5:18 p.m. 72
26 John Dec. 11, 2012, 1:21 p.m. 77
25 AimHere Dec. 11, 2012, 12:44 p.m. 79
24 gteissier Dec. 8, 2012, 4:36 p.m. 37
23 Ali Ghaffaari Dec. 6, 2012, 4:44 p.m. 63
22 sklarzm Dec. 6, 2012, 10:46 a.m. 46
21 Serhiy Dec. 6, 2012, 8:37 a.m. 81
20 cadaker Dec. 6, 2012, 8:03 a.m. 56
19 Joshua Pevner Dec. 6, 2012, 1:09 a.m. 57
18 Ana Echavarría Dec. 5, 2012, 8:09 p.m. 85
17 Timothy Loh Dec. 5, 2012, 1:36 p.m.   53
16 Brunnhilde_Minkowski Dec. 5, 2012, 5:28 a.m. 56
15 mikefc Dec. 1, 2012, 1:21 p.m. 74
14 Aliaksei Danchanka Nov. 30, 2012, 9:36 p.m. 80
13 hogeus Nov. 27, 2012, 1:14 p.m. 87
12 Ivan Vecerina Oct. 31, 2012, 9:38 a.m. 86
11 Doug Strain Oct. 25, 2012, 8:53 p.m. 58
10 Kirill Zhegulev Oct. 20, 2012, 1:28 a.m. 89

Combinatorics

The mathematics of counting objects.

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