title: given a list of up to 10 integer numbers and a sum, will display a subset of the numbers whose total is that sum
body: <p>Write a program which, given a list of up to 10 integer numbers and a sum, will display a subset of the numbers whose total is that sum if one exists or indicate that none exists otherwise. For example, for the list: 5,13,24,9,3,3 and sum = 28, your program should display 13, 9, 3, 3.</p>
  
  <p>How to do this in C++ using a recursive function?</p>