InterviewBit Problems   Combination Sum II : Unsolved

About the Combination Sum II : Unsolved category (1)
Some subsets are missing..why please help (2)
Easier than editorial (1)
Sample test case is wrong or confusing so please dont waste ur tim (3)
Same as previous problem with slight change (1)
Unordered_set<vector<int> > not allowed (2)
Time Complexity analysis (3)
Dont check for 10,1,2,7,6,1,5 and target 8 (2)
Will the two different 15s (at different indexes in given array) not be considere (2)