input: Write a python function to get the count of unique values in an array.
  assert get_unique_values([1, 5, 5, 4, 4, 6, 7, 7]) == 5
  assert get_unique_values([10, 20, 20, 10, 30, 40, 40, 50]) == 5
  assert get_unique_values([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 10
output: def get_unique_values(arr):
      return len(set(arr))