最近点对的算法： 对给定数量的点，求其中点对的最短距离。（测试样本为1000,5000个点，跑出来的时间均为0（s））详细思路请看程序注释。-The nearest point of the algorithm: for a given number of points, find the point where the shortest distance. (1000,5000 the test sample points, running out of time are 0 (s))