Another way to look at this is that 2^ 33 is about 8.5 billion >>> pow(2, 33) 8589934592 There are less than 8.5 billion people in the world, so you could jus

Another way to look at this is that 2^ 33 is about 8.5 billion >>> pow(2, 33) 8589934592 There are less than 8.5 billion people in the world, so you could just create a map from each person to a number in the set.