class Solution(object):

    def findPeakElement(self, nums):

        """

        :type nums: List[int]

        :rtype: int

        """

        if len(nums) == 0:

            return None

        if len(nums) == 1 or nums[0]>nums[1] :

            return 0

        if nums[-1] > nums[-2]:

            return len(nums)-1

        for i in range(1,len(nums)-1):

            if nums[i] > nums[i-1] and nums[i] > nums[i+1]:

                return i
       

import math

class Solution(object):

    def findPeakElement(self, nums):

        """

        :type nums: List[int]

        :rtype: int

        """

        nums = [-float('inf')] + nums + [-float('inf')]

        for i in range(1, len(nums)-1):

            if nums[i-1] < nums[i] > nums[i+1]:

                return i-1