mediumBacktracking

Subsets

## Problem

Given an integer array `nums` of **unique** elements, return *all possible subsets (the power set)*.

The solution set **must not** contain duplicate subsets. Return the solution in **any order**.

Examples

Input
nums = [1,2,3]
Output
[[],[1],[2],[1,2],[3],[1,3],[2,3],[1,2,3]]
All 8 subsets of [1,2,3].
Input
nums = [0]
Output
[[],[0]]
Empty set and {0}.

Constraints

1 <= nums.length <= 10 -10 <= nums[i] <= 10 All the numbers of nums are unique.
Python
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