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Explain backtracking and use it to generate all permutations / subsets / combinations.

Backtracking is the pattern behind permutations, subsets, N-queens, and constraint problems. The signal is the choose/explore/un-choose template plus pruning, and knowing exactly which knob separates permutations from combinations.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Backtracking is the pattern behind permutations, subsets, N-queens, and constraint problems. The signal is the choose/explore/un-choose template plus pruning, and knowing exactly which knob separates permutations from combinations.

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