Recursion solves a problem by calling itself on smaller inputs until a base case. Backtracking is recursion that tries a choice, explores further, and undoes the choice when it leads to a dead end.
Recursion and backtracking - Interview Concepts - ExtraBrain is part of ExtraBrain's local-first Mac workflow for live interviews, meetings, transcription, provider control, and responsible AI use.
Recursion solves a problem by calling itself on smaller inputs until a base case. Backtracking is recursion that tries a choice, explores further, and undoes the choice when it leads to a dead end.
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Define a clear base case and how each call reduces the problem toward it.
Choose, explore, and un-choose, pruning branches that cannot lead to a valid solution.
Reach for it on permutations, combinations, subsets, and constraint problems like N-Queens.
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Backtracking is a form of recursion that explores choices and undoes them, systematically searching a solution space with pruning.
Ensure a reachable base case, bound recursion depth, and consider an iterative or memoized approach for deep recursion.
