static void Main(string[] args)
        {
            int n = 5;

            string[] vertexValue = new string[] { "A", "B", "C", "D", "E" };
            Graph    graph       = new Graph(5);

            //添加顶点
            for (int i = 0; i < n; i++)
            {
                graph.InsertVertex(vertexValue[i]);
            }

            //添加边
            graph.InsertEdge(0, 1, 1);
            graph.InsertEdge(0, 2, 1);
            graph.InsertEdge(1, 2, 1);
            graph.InsertEdge(1, 3, 1);
            graph.InsertEdge(1, 4, 1);

            graph.ShowGraph();
            Console.WriteLine();
            graph.DFSShow();

            Console.ReadLine();
        }