Combinatorics

Badge Level 4 × 157

Solve 20 problems on Combinatorics topic.

# User Unlock date Country XP
157 yds88228 Sept. 17, 2019, 8:02 p.m.   110
156 Oren Milman Sept. 16, 2019, 12:33 p.m. 285
155 mchap3 Sept. 13, 2019, 3:46 p.m.   95
154 death July 26, 2019, 12:34 a.m. 103
153 Leo Mazaev July 19, 2019, 8:43 p.m. 285
152 IgorKozlovskii May 20, 2019, 9:31 p.m. 94
151 DW Daniel Kim April 16, 2019, 7:51 a.m. 285
150 Kuang Chuan Lo March 19, 2019, 11:45 a.m. 88
149 András Szilágyi Feb. 15, 2019, 6:20 p.m. 223
148 Ivan Appel Nov. 6, 2018, 9:23 p.m. 87
147 Shumin Li Nov. 3, 2018, 7:30 a.m. 108
146 匡盟盟 Nov. 1, 2018, 7:16 a.m. 109
145 JPH Oct. 24, 2018, 4:56 a.m. 281
144 LiQiuhui Sept. 29, 2018, 5:35 p.m.   110
143 cxrjj Sept. 20, 2018, 10:02 a.m. 153
142 gautrang Sept. 10, 2018, 6:22 a.m. 285
141 Arnaud Liehrmann Aug. 9, 2018, 7:14 p.m. 196
140 Frederick June 22, 2018, 7:15 p.m. 158
139 zhengt June 11, 2018, 9:21 a.m. 80
138 gilgamec May 15, 2018, 1:39 p.m. 160
137 Haibao Tang April 29, 2018, 9:39 p.m. 285
136 dscsamson April 4, 2018, 12:08 p.m. 91
135 malipivo March 22, 2018, 12:30 p.m. 192
134 Emiliamw Feb. 6, 2018, 3:02 a.m.   98
133 ZhenHu Feb. 3, 2018, 12:38 a.m.   207
132 Ann Caplin Jan. 31, 2018, 1:39 a.m. 153
131 Jonathan Dursi Jan. 6, 2018, 4:14 a.m. 102
130 Tamas Kurics Sept. 30, 2017, 1:53 p.m. 280
129 winterriver Sept. 9, 2017, 8:54 p.m.   109
128 NiakTheWizard Aug. 27, 2017, 5:23 p.m. 161
127 Elmar Hinz Aug. 4, 2017, 10:38 a.m. 309
126 Matt Person July 7, 2017, 8:05 a.m. 92
125 Huaiyu Sun May 16, 2017, 6:57 p.m. 287
124 bspitzerR March 15, 2017, 4:47 a.m.   97
123 Dohoon Lee March 9, 2017, 11:27 a.m. 268
122 skafdasschaf Jan. 24, 2017, 1:21 p.m. 148
121 Adam Knapp Jan. 6, 2017, 5:29 p.m. 96
120 Byoungnam Min Jan. 6, 2017, 1:44 a.m. 169
119 cescgina Jan. 2, 2017, 6:34 p.m. 285
118 SaraS Dec. 12, 2016, 9:30 a.m.   77
117 dcyoo Dec. 2, 2016, 4:57 a.m.   108
116 Strahil Ivanov Pastuhov Aug. 26, 2016, 8:18 a.m. 258
115 Evgeny Polevikov Aug. 12, 2016, 4 p.m. 158
114 Błażej Kramarski Aug. 8, 2016, 12:11 a.m. 139
113 lding July 15, 2016, 1:24 a.m.   139
112 bspitzer July 4, 2016, 6:16 p.m.   108
111 ray_chenrf June 19, 2016, 10:57 a.m. 146
110 Oguz Hidir May 27, 2016, 1:08 a.m. 285
109 yx749 May 22, 2016, 10:45 a.m. 319
108 Ming Jie Wong May 18, 2016, 1:22 p.m. 141
107 holomorph__ May 13, 2016, 7:30 p.m. 74
106 Hélio Wang April 22, 2016, 2:07 p.m. 245
105 Dmitry Ischenko March 16, 2016, 6:23 p.m. 106
104 Saddam Hossain Feb. 24, 2016, 6:26 p.m. 189
103 Naveen kumar Feb. 20, 2016, 8:16 p.m. 214
102 Tomáš Hromada Feb. 2, 2016, 9:45 p.m. 111
101 alexpm100 Jan. 20, 2016, 1:11 a.m.   194
100 xiaodili Jan. 12, 2016, 11:58 p.m. 319
99 simra73 Jan. 9, 2016, 7:05 a.m.   99
98 kapoozy Nov. 27, 2015, 8:39 p.m. 114
97 Peter Groenhout Oct. 27, 2015, 5:45 a.m. 100
96 IIMOG Oct. 2, 2015, 11:04 a.m. 319
95 Anngaocui Sept. 29, 2015, 2:34 a.m.   97
94 kaptajnbligh Sept. 26, 2015, 11:47 p.m. 86
93 nathankitchen Sept. 23, 2015, 10:11 p.m.   86
92 gustav Sept. 13, 2015, 2:12 p.m. 85
91 Alexey Dobronadezhdin Sept. 4, 2015, 9:06 p.m. 313
90 Filip Hrenić Aug. 17, 2015, 5:46 a.m. 126
89 Fan Zhang Aug. 14, 2015, 8:31 a.m. 207
88 Enes Poyraz July 31, 2015, 12:11 a.m. 237
87 LisperWhisper July 28, 2015, 11:51 a.m. 165
86 Edgar Martínez Encarnación July 25, 2015, 5:53 p.m. 284
85 Alexander Pfundner July 2, 2015, 1:06 p.m. 117
84 Eugene Baulin June 29, 2015, 6:09 p.m. 198
83 Quan Wei June 26, 2015, 1:24 p.m. 268
82 Bo Chen June 8, 2015, 8:57 p.m. 227
81 Alex Ostrovski June 7, 2015, 2:43 p.m. 105
80 Erika Álvarez May 25, 2015, 1:07 a.m. 309
79 RandyWaterhouse May 21, 2015, 6:35 a.m. 311
78 svengato May 6, 2015, 5:04 a.m.   319
77 Jerry Kiely April 7, 2015, 7:04 a.m. 279
76 kingofthepark March 13, 2015, 11:29 p.m. 102
75 photonic Feb. 15, 2015, 8:16 a.m. 85
74 Fredrik Bergroth Feb. 12, 2015, 1:17 p.m. 194
73 Kuan-Yi Li Feb. 2, 2015, 3:53 p.m.   152
72 Nikita Shpilevoy Jan. 25, 2015, 8:45 p.m. 121
71 Evgeny Karpov Jan. 16, 2015, 4:28 p.m. 125
70 spalac24 Jan. 16, 2015, 9:38 a.m. 87
69 Tarjei Mikkelsen Jan. 1, 2015, 8:39 p.m. 163
68 Peter Georgeson Nov. 30, 2014, 10:13 a.m. 173
67 max Nov. 29, 2014, 11:45 p.m. 117
66 Rok Kralj Nov. 29, 2014, 4:15 p.m. 145
65 Andy Bowes Oct. 12, 2014, 1:38 p.m. 281
64 Nikita Alexeev Oct. 9, 2014, 5:37 a.m. 246
63 Jeremy Teitelbaum Aug. 24, 2014, 2:11 p.m. 96
62 laurent.mazare Aug. 16, 2014, 3:48 p.m. 211
61 Oleg Martynov Aug. 3, 2014, 10:08 a.m. 127
60 Joel Southgate Aug. 2, 2014, 12:42 a.m.   100
59 inamori July 30, 2014, 2:17 p.m. 303
58 Yuanchao Zhang May 16, 2014, 4:20 p.m. 111
57 Zoya May 16, 2014, midnight 105
56 root Feb. 7, 2014, 1:32 a.m. 228
55 Rodrigo Marcuschi Jan. 21, 2014, 2:11 p.m. 240
54 Oren Livne Jan. 6, 2014, 4:11 a.m. 144
53 Tsai, Meng-Gen Dec. 29, 2013, 12:11 p.m. 184
52 Thad Edens Dec. 11, 2013, 8:24 p.m. 104
51 Ivan Komarov Dec. 10, 2013, 9:26 p.m. 153
50 Fernando Ferreira Dec. 5, 2013, 10:42 p.m. 148
49 Victor Frankenstein Nov. 27, 2013, 12:09 p.m. 109
48 smallfry Oct. 30, 2013, 1:37 p.m.   319
47 Alexander Nilov Oct. 26, 2013, 3:32 p.m. 157
46 Dmitry Bychenko Oct. 21, 2013, 11:19 a.m. 250
45 fsipiere Oct. 17, 2013, 3:03 p.m. 99
44 Pavel Kuznetsov Oct. 13, 2013, 9:48 a.m. 107
43 retunsky Sept. 28, 2013, 4:32 a.m.   77
42 oleglyamin Sept. 21, 2013, 10:55 a.m. 113
41 Andrey Popov Sept. 21, 2013, 3:09 a.m. 319
40 sk27 Sept. 5, 2013, 1:06 a.m. 235
39 Yury Grushetsky Aug. 27, 2013, 9:35 p.m. 319
38 Karlik Aug. 13, 2013, 8:44 p.m. 77
37 Russell (Noorista) Myers Aug. 4, 2013, 1:57 a.m. 218
36 Walter Vannini Aug. 2, 2013, 4:52 a.m. 207
35 David Eccles (gringer) July 23, 2013, 5:48 a.m. 288
34 HansWurst July 17, 2013, 8:46 a.m. 101
33 Tomaž Hočevar June 22, 2013, 9:32 a.m. 206
32 plainman June 3, 2013, 2:39 p.m. 98
31 Matthew Fahrbach June 2, 2013, 6:13 p.m. 95
30 Peter de Rivaz June 1, 2013, 12:29 p.m. 157
29 Kevin OConnor May 17, 2013, 11:04 p.m. 112
28 Chunxiao Song May 16, 2013, 6:05 p.m.   115
27 grondilu May 8, 2013, 2:37 p.m. 89
26 董偉業 wai yip tung May 8, 2013, 4:43 a.m. 319
25 Alex Gordeev April 28, 2013, 6:39 p.m. 95
24 E. Choroba April 20, 2013, 11:45 p.m. 258
23 Niyaz Nigmatullin April 20, 2013, 6:52 p.m. 120
22 Natalia Belyaeva April 17, 2013, 9:12 p.m. 293
21 mariel.21 April 7, 2013, 9:14 a.m. 104
20 Mark Mammel April 4, 2013, 2:49 a.m. 319
19 Natalya Ginzburg April 1, 2013, 8:54 a.m. 109
18 Myke March 26, 2013, 6:26 p.m. 110
17 Aleksey Romanenko March 25, 2013, 10:40 a.m. 115
16 Timur Turaev March 25, 2013, 6:28 a.m. 127
15 netoctone March 24, 2013, 3:26 p.m. 175
14 Kevin Lyles March 23, 2013, 9:26 p.m. 132
13 Zorn March 19, 2013, 2:14 a.m.   103
12 kobak March 18, 2013, 7:31 p.m.   108
11 Alexander Potashev March 18, 2013, 10:31 a.m. 206
10 Roman Andreev March 6, 2013, 8:54 p.m. 119
9 leafmoon March 4, 2013, 8:05 a.m. 316
8 sarasouju March 1, 2013, 4:14 a.m. 121

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Combinatorics

The mathematics of counting objects.

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