数据结构的经典实验程序。以全国主要城市为图的顶点, 铁路连接为图的边, 距离作为加权, 设计完成一个最短路径自动查找系统；输入为出发城市和目标城市, 输出为最短路径和距离。 -data structure of the classic experimental procedure. In major cities across the country to the vertex, the railway linking the edge of the map, as the weighted