根据公汽线路信息数据，编写对任意车站，寻找通过该站的汽车线路的M文件；

（3）编写M文件，对任意两个车站m,n，判断是否有线路通过这两车站，若有则编写寻找通过该站的汽车线路的M文件

（4）对任意两个车站m,n，若没有线路直接通过这两车站，编写通过一次转车而到达两站的M文件

-According to the bus line information and data to write on any station to find the M-file line through the station car　(3) the preparation of the M-file, any two stations m, n, determine whether the line through these two stations, if write to find the M-file line through the station car (4) any two stations m, n, if there is no line directly through the two stations, the preparation time to change trains to reach the M-file of the two stations