Differing pairs

Computer Science Level 3

Given an array of unique randomly sorted integers and a number $k$ it is required to find the count of the unordered pairs in the array that have a difference of $k$ . In the text file, how many unorederd pairs of numbers have a difference of 70.

Details and Assumptions

As an example in the array [2, 8, 4, 3, 1] with $k=2$ is $2$ ....(2,4) and (3,1).