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* refactor: clean to roadmap content * refactor: move shared helpers into scripts/lib
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Subsets
Given an array of unique integers, return all possible subsets, including the empty set. You use backtracking to make a binary decision at each element: include it or skip it, building subsets recursively. This problem teaches the foundation of backtracking, the include/exclude decision tree that underpins all subset and combination problems.
Visit the following resources to learn more: