这是一道ACM的关于交通运输的题目！主要用到了递归算法！有参考价值！-ACM on the subject of transport! Main uses recursive algorithm! Reference value!

一个系统搜索工具,使用了递归的算法,代码很成熟,希望能参考一下该代码,一边能更好的完成工作.-a system search tool, the use of a recursive algorithm, code very mature, hope to make reference to the code. better side of the completed work.

实现凸包算法，可以清晰的看见递归的过程，也可以看出最后的区域-Convex hull algorithm recursive process, you can clearly see, the last area can also be seen