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Problem Library

Master these coding challenges to ace your next technical interview. Handpicked problems with personalized spaced repetition.

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All tracksBlind 75NeetCode 150NeetCode 250Striver A to ZSDE Sheet

Showing 9 of 40 problems in SDE Sheet.

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All topicsArrayBacktrackingBinary SearchBinary Search TreeBinary TreeBreadth-First SearchCombinatoricsCountingDepth-First SearchDivide and ConquerDynamic ProgrammingGraph TheoryHash TableHeap (Priority Queue)Linked ListMathMatrixMemoization

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StatusTitleDifficulty
79. Word SearchMedium
98. Validate Binary Search TreeMedium
104. Maximum Depth of Binary TreeEasy
110. Balanced Binary TreeEasy
133. Clone GraphMedium
199. Binary Tree Right Side ViewMedium
200. Number of IslandsMedium
207. Course ScheduleMedium
230. Kth Smallest Element in a BSTMedium