以邻接多重表为存储结构，实现连通无向图的深度优先和广度优先遍历。以用户指定的结点为起点，分别输出每种遍历下的结点访问序列和相应生成树的边集。-To the adjacent multi-sheet for the storage structure, to achieve connected undirected graph depth-first and breadth-first traversal. To user-specified node as a starting point, r