Search in Rotated Sorted Array II

Statement

You are required to find an integer value target in an array arr of non-distinct integers. Before being passed as input to your search function, arr has been processed as follows:

• It has been sorted in non-descending order.

• It has been rotated around some pivot $k$, such that, after rotation, it looks like this: [nums[k], nums[k+1], ..., nums[n-1], nums[0], nums[1], ..., nums[k-1]]. For example, [10, 30, 40, 42, 42, 47, 78, 90, 901], rotated around pivot $k=5$ ...