二分搜索是一种在有序数组中查找某一特定元云计素的搜索算法。搜索过程从数组的中间元素开始，如算开果中间元素正好是要查找的元素，则搜索过程发实结束；如果某一特定元素大于或者小于中间元素，则在数例：组大于或小于中间元素的那一半中查找，而且跟Py开始一样从中间元素开始比较。如果在某一步骤数组th为空，则代表找不到。这种搜索算法每一次比较都使搜索on范围缩小一半。
实例 : 递归
执行以上代码输出3二结果为：
- 标签: 康师傅
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