导游咨询系统，对输入的景观图的数据，进行运算，得到最近路径-Guide to enter the system, consultation, the data of landscape graph, recent calculations

设计一个交通咨询系统，能让旅客咨询从任一个城市到另一个城市之间的最短路径（里程）。(Design a traffic consulting system that allows passengers to consult the shortest path (mileage) from one city to another.)