Total Questions
100
Medium problems make up 60.00 % of what Citadel asks, so that is the tier to prioritise.
Easy77.00 %
Medium6060.00 %
Hard3333.00 %
Questions
Sort100 shown
- Longest Non-decreasing Subarray From Two ArraysMediumfreq 100
- Binary Tree Maximum Path SumHardfreq 98
- Delete and EarnMediumfreq 95
- Minimum Knight MovesMediumfreq 94
- LFU CacheHardfreq 79
- Minimum Costs Using the Train LineHardfreq 79
- Maximum Total Damage With Spell CastingMediumfreq 77
- Number of Good Binary StringsMediumfreq 77
- Maximum Length of Repeated SubarrayMediumfreq 75
- Best Position for a Service CentreHardfreq 75
- First Completely Painted Row or ColumnMediumfreq 73
- LRU CacheMediumfreq 73
- Subarray Sums Divisible by KMediumfreq 71
- Longest String ChainMediumfreq 71
- Palindromic SubstringsMediumfreq 71
- Serialize and Deserialize Binary TreeHardfreq 68
- Evaluate Reverse Polish NotationMediumfreq 68
- Best Time to Buy and Sell Stock IIMediumfreq 65
- Best Time to Buy and Sell StockEasyfreq 65
- Sliding Window MaximumHardfreq 65
- PermutationsMediumfreq 62
- Find the Duplicate NumberMediumfreq 62
- Length of Longest Subarray With at Most K FrequencyMediumfreq 62
- Evaluate DivisionMediumfreq 62
- Sudoku SolverHardfreq 58
- Validate Binary Search TreeMediumfreq 58
- Robot Room CleanerHardfreq 58
- Insert Delete GetRandom O(1)Mediumfreq 58
- Number of IslandsMediumfreq 58
- Find Median from Data StreamHardfreq 58
- Couples Holding HandsHardfreq 58
- Regular Expression MatchingHardfreq 58
- Perfect SquaresMediumfreq 53
- Design Search Autocomplete SystemHardfreq 53
- Search Suggestions SystemMediumfreq 53
- Trapping Rain WaterHardfreq 53
- Parallel Courses IIIHardfreq 53
- Merge k Sorted ListsHardfreq 53
- Group AnagramsMediumfreq 53
- Rotting OrangesMediumfreq 53
- Design Circular QueueMediumfreq 53
- N-QueensHardfreq 53
- Count Palindromic SubsequencesHardfreq 53
- Design Front Middle Back QueueMediumfreq 47
- Transform to ChessboardHardfreq 47
- Design Excel Sum FormulaHardfreq 47
- Sort Items by Groups Respecting DependenciesHardfreq 47
- Fizz BuzzEasyfreq 47
- Letter Combinations of a Phone NumberMediumfreq 47
- Merge IntervalsMediumfreq 47
- Implement Trie (Prefix Tree)Mediumfreq 47
- Median of Two Sorted ArraysHardfreq 47
- Maximal SquareMediumfreq 47
- Best Time to Buy and Sell Stock IVHardfreq 47
- Longest Increasing Path in a MatrixHardfreq 47
- Minimum Height TreesMediumfreq 47
- Alien DictionaryHardfreq 47
- 3SumMediumfreq 47
- Combination SumMediumfreq 47
- Count Ways To Build Good StringsMediumfreq 47
- Best Time to Buy and Sell Stock IIIHardfreq 47
- House RobberMediumfreq 47
- Word Ladder IIHardfreq 38
- Count Number of Maximum Bitwise-OR SubsetsMediumfreq 38
- Subarray Sum Equals KMediumfreq 38
- Sqrt(x)Easyfreq 38
- Moving Average from Data StreamEasyfreq 38
- Roman to IntegerEasyfreq 38
- Paint HouseMediumfreq 38
- Search a 2D Matrix IIMediumfreq 38
- Climbing StairsEasyfreq 38
- Valid ParenthesesEasyfreq 38
- Rank Transform of a MatrixHardfreq 38
- Longest Increasing SubsequenceMediumfreq 38
- Container With Most WaterMediumfreq 38
- Binary Tree Zigzag Level Order TraversalMediumfreq 38
- Pow(x, n)Mediumfreq 38
- Reorganize StringMediumfreq 38
- Populating Next Right Pointers in Each NodeMediumfreq 38
- Egg Drop With 2 Eggs and N FloorsMediumfreq 38
- Course Schedule IIMediumfreq 38
- Knight Probability in ChessboardMediumfreq 38
- Longest Common SubsequenceMediumfreq 38
- Asteroid CollisionMediumfreq 38
- Course ScheduleMediumfreq 38
- Bus RoutesHardfreq 38
- Word LadderHardfreq 38
- Basic CalculatorHardfreq 38
- Populating Next Right Pointers in Each Node IIMediumfreq 38
- The Skyline ProblemHardfreq 38
- Simplify PathMediumfreq 38
- Word SearchMediumfreq 38
- Unique PathsMediumfreq 38
- Spiral MatrixMediumfreq 38
- Permutations IIMediumfreq 38
- Next PermutationMediumfreq 38
- Predict the WinnerMediumfreq 38
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