Find Peak Element

A peak element is an element that is strictly greater than its neighbors.

Consider that we are given a list of numbers, such as the following:

[1, 2, 3, 1]

Determine the peak element of this list, and return its index. If the array contains multiple peaks, return the index to any of the peaks.

Constraints

• 1 <= nums.length <= 1000
• -2³¹ <= nums[i] <= 2³¹ - 1
• nums[i] != nums[i + 1] for all valid i.