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Duolingo LeetCode Questions 2026

Browse LeetCode problems frequently asked by Duolingo. Filter by difficulty and timeframe to focus your interview prep.

Last updated: 20 Feb 2026

ProblemDifficultyFrequencyTopics
Encrypt and Decrypt StringsHARD
100%
ArrayHash TableStringDesignTrie
K Radius Subarray AveragesMEDIUM
87.5%
ArraySliding Window
Minimum Number of People to TeachMEDIUM
87.5%
ArrayHash TableGreedy
Task Scheduler IIMEDIUM
62.5%
ArrayHash TableSimulation
Longest Increasing Path in a MatrixHARD
75%
ArrayDynamic ProgrammingDepth-First SearchBreadth-First SearchGraph TheoryTopological SortMemoizationMatrix

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