input: Write a Python function that checks if an array can be sorted in non-decreasing order by any number of right rotations. Return True if it is possible, otherwise return False. If the input array is empty, return True.
  assert can_sort_with_rotations([3, 4, 5, 1, 2])==True
  assert can_sort_with_rotations([3, 5, 10, 1, 2])==True
  assert can_sort_with_rotations([4, 3, 1, 2])==False
  assert can_sort_with_rotations([3, 5, 4, 1, 2])==False
  assert can_sort_with_rotations([])==True
output: def can_sort_with_rotations(arr):
      if not arr:
          return True
      n = len(arr)
      dropped = 0
      for i in range(1, n):
          if arr[i] < arr[i-1]:
              dropped += 1
              if dropped > 1 or arr[i] > arr[0]:
                  return False
      return True if dropped == 0 or arr[0] >= arr[-1] else False