设计无向网的图文件格式，读取图文件，生成基于邻接矩阵和邻接表的无向网，并将邻接矩阵表示法和邻接表表示法相互转换。(The graph file format of the undirected network is designed, the graph files are read, the undirected network based on the adjacency matrix and the adjacency table is generated, and the adjacen