二分搜索是运用分治策略的典型例子。二分搜索方法充分利用了元素间的次序关系，采用分治策略，可在最坏情况下用O(logn)的时间完成搜索任务。-two hours search is to use the divide and conquer strategy is a typical example. Two-search method full use of the elements in the order, using the divide and conquer strategy, in the worst case with O (logn) time to complete the search.