说明：  一． 问题描述很多涉及图上操作的算法都是以图的遍历为基础的。试写一个程序，演示在连通的无向图上访问全部节点的操作。二． 基本要求以邻接多重链表为存储结构。实现连通无向图的深度和广度优先遍历。以用户指定的节点为起点，分别输出每种遍历下的节点访问序列和相应生成树的边集。
(one. Description many issues involving maps of algorithms are to traverse the map-based. A written test procedures, demonstrating the connectivity of undirected graph visit all the nodes on the operation. 2. Adjacent to the basic requirements for storage of multiple linked list structure. Connectivity to the map without the depth and breadth- first traversal. User specified nodes as a starting point, the output of each node traversal visit Spanning Tree sequence and the corresponding set of edges.)