Sum it up Questions Backtracking

#1


Getting wrong output
Please debug this code it not printing in correct order

#2

hi dashpreet
the problem with your code is that it is printing duplicates pairs as well.
you can do something like storing all combinations in a set data structure(which doesn’t allow duplicates).

#3

In which data structure should I store?

#4

SET is not taught yet in this course,how to use it?