"""
Chapter 10 - Problem 10.10 - Rank from Stream
Problem:
Imagine you are reading in a stream of integers. Periodically, you wish to be able to look up the
rank of a number x (the number of values less than or equal to x). Implement the data structures
and algorithms to support these operations. That is, implement the method track (int x), which
is called when each number is generated, and the method getRankOfNumber (int x), which returns the 
number of values less than or equal to x (not including x itself).

"""
