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33. 搜索旋转排序数组

https://leetcode-cn.com/problems/search-in-rotated-sorted-array/

假设按照升序排序的数组在预先未知的某个点上进行了旋转。

( 例如,数组 [0,1,2,4,5,6,7] 可能变为 [4,5,6,7,0,1,2] )。

搜索一个给定的目标值,如果数组中存在这个目标值,则返回它的索引,否则返回 -1 。

你可以假设数组中不存在重复的元素。

你的算法时间复杂度必须是 O(log n) 级别。

示例 1:

输入: nums = [4,5,6,7,0,1,2], target = 0
输出: 4

示例 2:

输入: nums = [4,5,6,7,0,1,2], target = 3
输出: -1
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