Migratory BirdsEasy
Given an array of bird sightings where every element represents a bird type id, determine the id of the most frequently sighted type. If more than 1 type has been spotted that maximum amount, return the smallest of their ids.
Example
\(arr = [1, 1, 2, 2, 3]\)
There are two each of types \(1\) and \(2\), and one sighting of type \(3\). Pick the lower of the two types seen twice: type \(1\).
