input: Write a function to determine if a given list of integers can be reordered into non-decreasing order by performing any number of right shift operations. If it is possible, return True; otherwise, return False. If the given list is empty, return True.
  
  assert can_be_sorted_by_shift([1, 2, 3, 4, 5]) == True
  assert can_be_sorted_by_shift([3, 4, 5, 1, 2]) == True
  assert can_be_sorted_by_shift([4, 3, 2, 1]) == True
  assert can_be_sorted_by_shift([5, 3, 2, 4, 1]) == False
  assert can_be_sorted_by_shift([]) == True
output: def can_be_sorted_by_shift(nums):
      if not nums:
          return True
      n = len(nums)
      count = 0
      for i in range(n):
          if nums[i] > nums[(i + 1) % n]:
              count += 1
          if count > 1:
              return False
      return True