题目内容
对有向图来说，邻接矩阵A(G)的第i行1的个数是vi的出度， 第j列1的个数是vj的入度。
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无向图G的完全关联矩阵M(G)中所有元素之和是图各结点度数的和，也是边数的2倍。
图的 邻接矩阵体现的是结点之间的邻接关系； 可达性矩阵体现的是有向图中结点之间的可达关系；完全关联矩阵体现的是结点与边之间的关联关系。
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