深度优先遍历的应用，判断图是否连通，是否有回路，是否为强连通，是否为单连通-yeah,it is really good!!

利用邻接矩阵或邻接表存储一张图，分别采用图的深度优先搜索和广度优先搜索遍历该图，并输出遍历结果-Using the adjacency matrix or adjacency list storage a picture, using depth-first search and the breadth first search traversal of the graph, and the output traversal results

创建图的邻接表存储结构,输出邻接表数据(验证创建过程),深度优先遍历(DFS) ,广度优先遍历(BFS),增加一个顶点到图, 删除一个顶点(同时删除其所有邻接边) ,增加一条弧到图,从图中删除一条弧- Creating adjacency table storage structure, the output adjacency table data (validation creation process), depth-first traversal (DFS), breadth-fi