说明：  本程序的功能是对一个网络拓扑图寻求最短路径，输出结果包括路劲的节点顺序、最短路径的长度等，该程序代码简单，通过备注也容易理解。
(The functionality of the program is a network topology map for the shortest path, the output including the shortest path s node order, the shortest path length, the code is simple and easy to understand through the Notes.)