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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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Showing 1-19 of 19 matching problems.

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All topicsAlgorithm XArrayBacktrackingBidirectional SearchBinary Indexed TreeBinary LiftingBinary SearchBinary Search TreeBinary TreeBit ManipulationBoyer–Moore Majority Vote AlgorithmBoyer–Moore String-Search AlgorithmBracket SequencesBreadth-First SearchBrute-Force SearchBubble SortBucket SortCombinatorics

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StatusTitleDifficulty
100. Same TreeOpen sourceEasy
101. Symmetric TreeOpen sourceEasy
102. Binary Tree Level Order TraversalOpen sourceMedium
103. Binary Tree Zigzag Level Order TraversalOpen sourceMedium
104. Maximum Depth of Binary TreeOpen sourceEasy
107. Binary Tree Level Order Traversal IIOpen sourceMedium
111. Minimum Depth of Binary TreeOpen sourceEasy
112. Path SumOpen sourceEasy
116. Populating Next Right Pointers in Each NodeOpen sourceMedium
117. Populating Next Right Pointers in Each Node IIOpen sourceMedium
126. Word Ladder IIOpen sourceHard
127. Word LadderOpen sourceHard
130. Surrounded RegionsOpen sourceMedium
133. Clone GraphOpen sourceMedium
199. Binary Tree Right Side ViewOpen sourceMedium
200. Number of IslandsOpen sourceMedium
207. Course ScheduleOpen sourceMedium
210. Course Schedule IIOpen sourceMedium
226. Invert Binary TreeOpen sourceEasy