模拟使用距离向量算法的路由器,计算最短路由，输出邻居列表,分组设定生存时间，超过生存时间被丢弃，需要重新发送分组。-Simulation using the distance vector algorithm routers, computing the shortest route, the output neighbor list, the survival time of group setting, more than the survival time is discarded, ne