class Solution(object):
    def nextGreaterElements(self, nums):
        """
        :type nums: List[int]
        :rtype: List[int]
        """
        nums2 = nums[:] + nums[:]
        stack = []
        peeks = [-1] * len(nums) * 2
        for i, num in enumerate(nums2):
            while stack and nums2[stack[-1]] < num:
                peeks[stack.pop()] = num
            stack.append(i)
        return peeks[:len(nums)]