Range of |2|
~~~~~~~~~~~~

In mathematics, range is defined as the difference between the largest
and the smallest values in a set of values. Implement a function named
*range_of* that takes a list of integers and returns the range of it as
an integer. The elements in list are not necessarily in ascending order.
You cannot use built-in functions :math:`\color{purple}{\texttt{min()}}`
or :math:`\color{purple}{\texttt{max()}}`.

.. container:: sampleio

   Sample I/O:

.. |2| image:: ../../figures/difficulty_two.png
   :class: difficulty

.. code:: default

   >>> range_of([1, 4, 6, 28, -10, 0, 0, 1])
   38

   >>> range_of([1])
   0

   >>> range_of([2, 2])
   0

.. raw:: html

   <button type="button" class="collapsible" onclick="toggle()">

Show the Answer

.. raw:: html

   </button>

.. raw:: html

   <div class="hiddenanswer">

.. code:: python

   # as the non-trivial solution
   def range_of(lst):
       min_elem, max_elem = lst[0], lst[0]
       for elem in lst[1:]:
           if elem < min_elem:
               min_elem = elem
           elif elem > max_elem:
               max_elem = elem
       return max_elem - min_elem

.. raw:: html

   </div>