根据输入的整数对，输出一个图形的邻接矩阵。并求出各结点的出度和入度；判断邻接矩阵是否是可达性矩阵，从而判断图是否是连通图。-The input of integer pair, the output of a graph adjacency matrix. And obtained the degree of each node and the in-degree determine whether it is up to the adjacency matrix matrix, which