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Edit distance (Levenshtein): the 2D dynamic programming pattern.

Edit distance is the canonical 2D string DP, behind spell-check, diff, and fuzzy matching. The signal is defining the subproblem and the insert/delete/replace recurrence. Here is the answer.

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

Edit distance is the canonical 2D string DP, behind spell-check, diff, and fuzzy matching. The signal is defining the subproblem and the insert/delete/replace recurrence. Here is the answer.

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