在12个互异元素构成的有序数组a[1..12]中进行二分查找（即折半查找，向下取整），若待查找的元素正好等于a[9]，则在此过程中，依次与数组中的（ ）比较后，查找成功结束。
- A.a[6]、a[7]、a[8]、a[9]
- B.a[6]、a[9]
- C.a[6]、a[7]、a[9]
- D.a[6]、a[8]、a[9]
正确答案及解析
正确答案
解析
二分查找的基本思想是将n个元素分成大致相等的两部分，取a[n/2]与x做比较，如果x=a[n/2],则找到x,算法中止；如果x＜a[n/2],则只要在数组a的左半部分继续搜索x,如果x>a[n/2],则只要在数组a的右半部搜索x。故查找顺序如下图所示：
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