There is an integer array nums sorted in ascending order (with distinct values). Prior to being passed to your function, nums is rotated at an unknown pivot index k (0 <= k < nums.length) such that the resulting array is [nums[k], nums[k+1], ..., nums[n-1], nums[0], nums[1], ..., nums[k-1]] (0-indexed). For example, [0,1,2,4,5,6,7] might be rotated at pivot index 3 and become [4,5,6,7,0,1,2]. Given the array nums after the rotation and an integer target, return the index of target if it is in nums, or -1 if it is not in nums. Example 1: Input: nums = [4,5,6,7,0,1,2], target = 0 Output: 4 Example 2: Input: nums = [4,5,6,7,0,1,2], target = 3 Output: -1 Example 3: Input: nums = [1], target = 0 Output: -1 Constraints: 1 <= nums.length <= 5000 -104 <= nums[i] <= 104 All values of nums are unique. nums is guaranteed to be rotated at some pivot. -104 <= target <= 104 Follow up: Can you achieve this in O(log n) time complexity?