逢山开路问题

用的逐步定线方法，在解决这个问题中并不是一个很有效的方法，最好的方法为Dijkstra，但Dijkstra编起来比较简单（已有源程序，只须改变权矩阵），没有再进行练习。-Every mountain open issues with the progressive alignment method, to solve this problem is not a very effective way, I think the best way to Dijkstra, but it is relatively simple to compile Dijkstra (existing source code, only to change the weight matrix ), no longer to practice.