I was asked this at an interview. Find all subsets of ABB. The answer of which is
A B AB BB ABB
I knew the way of finding subsets where you iterate thru each element and then either include it or exclude it. That works well for distinct elements. But in a case like this it gives duplicate answers. In the interview, I just put them in a set to avoid duplicates, but then I was still exploring paths in the recursion that would ultimately end up in the duplicates. The interviewer wanted me to optimize the solution by avoiding exploring duplicate paths. How do I do that?
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