这是一个简单的列车查询系统，含插入、删除，修改，按车次查询，按目的站、始发站查询，车费查询，路程查询等功能，用到了最短路径的算法。-This is a simple train of inquiry systems, including insert, delete, modify, inquiries by the trips, according to the purpose of station stops sending information, fare information, in