从八皇后的例子看出搜速深度有限,仅有几层,而且不可能出现重复状态的问题,因此BACKTRACK过程完全适用,对于八数码问题则不然,必须设置深度范围限制及出现重复状态引起的死循环这两个回溯点. -Examples of Queen' s from eight to see the depth of search speed is limited, only few, but can not state the problem of duplication, so the process