用无向网表示江苏省南京、无锡、常州、昆山、连云港、南通、镇江、扬州、盐城、徐州，图中顶点表示城市信息，图中的边表示城市之间的距离，存放长度信息。要求能够建立交通网，所花的代价最小。(With no to the network in Jiangsu Province, said Nanjing Wuxi, Changzhou, Kunshan, Lianyungang, Nantong, Zhenjiang, Yangzhou, Yancheng, Xuzhou City, map vertex information, the edge map that the distance between the city and the length of stored information. The minimum cost is required to build a transportation network.)