Search In Rotated Array

Problem:

Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. For example, 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2.

You are given a target value to search. If found in the array return its index, otherwise return -1.

You may assume no duplicate exists in the array.

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