162. Find Peak Element

class Solution:
    def findPeakElement(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        left,right = 0, len(nums)-1
        while left < right:
            mid = (left + right)//2
            if nums[mid] < nums[mid+1]:
                left = mid+1
            else:
                right = mid
        return left