title: Constructing the largest number possible by rearranging a list
body: <p>Say I have an array of positive whole integers; I'd like to manipulate the order so that the concatenation of the resultant array is the largest number possible. For example <code>[97, 9, 13]</code> results in <code>99713</code>; <code>[9,1,95,17,5]</code> results in <code>9955171</code>. I'm not sure of an answer.</p>