实验要求：（1）理解图顶点和边的存储方法：邻接矩阵和邻接表；（2）理解图的遍历算法，掌握其应用；（3）应用图的遍历算法判断图是否连通和两顶点间是否存在路径。-Experimental requirements: (1) to understand the storage method: Figure the vertices and edges adjacency matrix and adjacency list (2) to understand graph traversal algor