程序实现了图论中D算法的编写，输入参数为节点数n、临街矩阵G、源节点v。输出参数为源节点到其他任意节点的最短路径.-The program perform the algorithm of D in grafic theroy,input parameters are the number of node,adject matrix G,source node v.output parameters are the shortest path from source node to destin