There is an integer array `nums` sorted in ascending order (with distinct values).

Prior to being passed to your function, `nums` is possibly rotated at an unknown pivot index `k` (`1 <= 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 possible rotation and an integer `target`, return the index of `target` if it is in `nums`, or `-1` if it is not in `nums`.

You must write an algorithm with `O(log n)` runtime complexity.

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 an ascending array that is possibly rotated.
- `-104 <= target <= 104`