设计一个医院选址程序。一个城市里有n个社区给定n个社区之间的交通图。若社区i与社区j之间有路可通，则将顶点i与顶点j之间用边连接，边上的权值Wij表示这条道路的长度。现打算在这n个社区中选定一个小区建一所医院，那么这间医院的所在的社区应该使这个城市的所有居民都能方便的到达（即使距离医院最远的小区到医院的路程最短）。-Design of a hospital site selection process. A city where there are n communities for a given n traffic between communities map. If the community i and community j can be a road between the pass, will be between vertex i and vertex j with edge connectivity, edge weights Wij that this path length. It is intended in the n communities selected a district build a hospital, this hospital where the community should make all residents of the city easy to reach (even if the cell farthest away from the hospital to the hospital the shortest distance) .