说明：  编写一个算法程序实现： 1、 用邻接表存储下图： 2、完成对以上图的深度优先搜索，设出发顶点是V1。
(Procedures for the preparation of an algorithm to achieve: 1, with adjacent storage under the map table: 2, completion of the above graph depth-first search, set the starting point is the V1.)