通信公司准备在n 个村庄中的某些村庄安装基站,对于村庄i ，在其中建立基站的花费 是Ci。我们把村庄看成是一个二维平面上的点。对于每一个基站，他们的规格，配置都是 相同的，一个基站发射的信号可以覆盖以它为中心的半径为R 米的圆形区域(边界上的也 算被覆盖)。现在公司希望用最小的花费，使得这n 个村庄都能被信号覆盖

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