[理工] [離散]-圖論
10
Let G=(V,E) be a graph where V={x|x屬於{0,1} is a bit string of length 10 }
E={{x,y}|x defferes from y in exactly 2 positions}. Then what is the value
of |E| ?
10 10
解法:對於所有v屬於V,deg(v)=C =45,|V|=2
2
所有deg(x)的和 = 2 |E|
10
2 *45 = 2|E|
9
|E| =2 *45
10
不太懂為何 C ?
2
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