Q90 Subsets II
Q90 Subsets II

Given a collection of integers that might contain duplicates, nums,
return all possible subsets.

Note:
Elements in a subset must be in non-descending order.
The solution set must not contain duplicate subsets.
For example,
If nums = [1,2,2], a solution is:

[
[2],
[1],
[1,2,2],
[2,2],
[1,2],
[]
]

robertzm/algotest