Dandn文件给出了输入参数的名称及格式
即在调用prim前先输入邻接矩阵D和节点个数n
输入prim
得到两行的矩阵T,将上下两行数字对应的节点相连即可(The Dandn file gives the name and format of the input parameter
That is, before entering prim, the adjacency matrix D and the number of nodes n are input
Input prim
Get the matrix T of the two row, and connect the nodes corresponding to the two lines of the upper and lower rows)