最短路径问题（用无向图表示n个城市之间的交通网络建设规划，顶点表示城市，边上的权表示该线路的造价，试设计一个方案，使得这个交通网的总造价最小。）-The shortest path problem (with undirected graph n cities that transport links between the construction plan, vertex, said city, said the right edge of the construction cost of the line and try to design a program, making the transport network of the total cost of the smallest.)