①由乘客给出上车和下车站的地点, 查询换乘公交车的最佳方案。即输出换乘的公车线路，乘车方向、路经车站和换乘的车站。

②输出所有的路线。

③增加和删除路线（管理员操作）。

④查找经过某站点的所有路线。

⑤查找某一路线，并输出其所有站点。

-① given by the passengers on the train and the next station locations, check for the best solution to take the bus. Transfer the output bus lines, car direction, passing the station and transfer station. ② Output all the routes. ③ add and remove routes (administrator operations). ④ After a site to find all the routes. ⑤ find a particular line, and output all of its sites.