二分查找又称折半查找，它是一种效率较高的查找方法。 　　【二分查找要求】：1.必须采用顺序存储结构 2.必须按关键字大小有序排列。 　　【优缺点】折半查找法的优点是比较次数少，查找速度快，平均性能好 其缺点是要求待查表为有序表，且插入删除困难。因此，折半查找方法适用于不经常变动而查找频繁的有序列表。 　　【算法思想】首先，将表中间位置记录的关键字与查找关键字比较，如果两者相等，则查找成功；否则利用中间位置记录将表分成前、后两个子表，如果中间位置记录的关键字大于查找关键字，则进一步查找前一子表，否则进一步查找后一子表。 　　重复以上过程，直到找到满足条件的记录，使查找成功，或直到子表不存在为止，此时查找不成功。 　　【算法复杂度】假设其数组长度为n，其算法复杂度为o（log（n））

C++编程二分法查找.txt

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