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!

这个程序里面包含ACM中常考的高精度算法的全部,非常有价值,算法比传统的要简单精炼,(This program contains all ACM often take an examination of the high precision of algorithm, are very valuable, algorithm is simple than the traditional refining,)