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LeetCodeBacktracking / DFSSolved Nov 11, 2025
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Go step by step: try it yourself before the video and the visual. Progress saves on this device.
Community-reported · source · updated 2026-10-08. ● asked in the last 6 months.
Step 1
Know these before you start
Tick what you already know
Concept videoStep 2
Try it on paper
5–10 minutes, no code yet
Given an integer array nums of unique elements, return all possible subsets (the power set). The solution should not contain duplicate subsets.
Step 6
Get it accepted
All test cases pass
Step 7
Review it so it sticks
Re-solve from memory after
Reading the solution first feels like progress, but it makes the next similar problem — and the interview version — much harder, because you skipped the part where you figure it out. Give it an honest 20–30 minutes. Stuck? Re-read the pattern, watch the concept video, or try the brute force first.
Hidden: approach · solution code · optimal solution