All TopicsAlgorithmsBackend
DesignConcurrencyDatabaseDatabase
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Palindrome PermutationEasyamazon apple bloomberg facebook google microsoft uber
Partition to K Equal Sum SubsetsMediumamazon bytedance ebay facebook google houzz linkedin microsoft pinterest vmware
Pascal’s Triangle 2 - Return nth rowEasyamazon goldman-sachs google oracle qualtrics
Peeking IteratorMediumamazon apple atlassian ebay facebook google microsoft oracle yahoo
Populate next pointer to right node in Binary TreeMediumamazon bloomberg facebook google microsoft oracle
Range Sum Query – MutableMediumamazon facebook google twitter
Range Sum Query 2D - ImmutableMediumamazon apple cruise-automation facebook google houzz lyft microsoft vmware
Reconstruct ItineraryHardamazon apple bloomberg citadel facebook goldman-sachs google microsoft qualtrics snapchat square twilio uber yandex yelp
Remove Invalid Parentheses ProblemHardamazon apple bloomberg facebook google houzz ponyai postmates uber
Remove K DigitsMediumadobe amazon bloomberg bytedance didi facebook google microsoft nutanix oracle snapchat vmware
Remove Outermost ParenthesesEasyapple facebook google
Reverse BitsEasyairbnb amazon apple facebook google samsung tencent
Reverse Words in a String 2Mediumamazon google microsoft uber vmware
Rotate n x n matrix by 90 degreesMediumadobe akuna-capital amazon apple bloomberg cisco facebook google groupon houzz lyft microsoft nvidia palantir palantir-technologies quora salesforce uber wish yandex
Scramble StringHardapple google
Search in Rotated Sorted Array 2 - Check if number exists - Duplicates allowedMediumadobe amazon bloomberg facebook google microsoft
Serialize and Deserialize Binary TreeHardamazon apple bloomberg citadel ebay expedia facebook google groupon indeed linkedin microsoft oracle qualtrics quora salesforce snapchat tableau uber vmware yahoo
Shortest Palindrome 1 - Prepending charactersHardadobe amazon bloomberg facebook google microsoft oracle pocket-gems
Sort Characters By FrequencyMediumamazon bloomberg expedia facebook google linkedin uber twitter
Spiral Matrix 1 - ReturnMediumadobe amazon apple bloomberg bytedance cisco drawbridge ebay epic-systems facebook goldman-sachs google hulu linkedin microsoft oracle paypal quip robinhood snapchat uber visa
Square root of an integerEasyamazon apple bloomberg facebook google huawei linkedin lyft microsoft qualtrics uber wayfair
Strobogrammatic Number 1 - Check if strobogrammaticEasycisco facebook google
Strobogrammatic Number 2 - Generate for length nMediumcisco facebook google twitter
Strobogrammatic Number 3 - Count in RangeHardfacebook google
Student Attendance Record 1Easygoogle
Student Attendance Record 2Hardgoogle uber
Sudoku SolverHardadobe amazon apple arista-networks doordash dropbox expedia facebook google microsoft oracle riot-games roblox snapchat uber vmware wish
Surrounded RegionsMediumamazon ebay facebook google splunk uber
Swap Nodes in PairsMediumadobe amazon apple bloomberg ebay facebook google lyft microsoft oracle sap uber
Valid NumberHardadobe amazon apple facebook google linkedin microsoft tripadvisor
Valid Parenthesis StringMediumalibaba amazon bloomberg facebook google
Valid SudokuMediumadobe amazon apple bloomberg cruise-automation doordash facebook google microsoft oracle pinterest roblox salesforce snapchat twitter uber vmware
Validate Binary Search TreeMediumadobe amazon apple asana atlassian bloomberg bytedance capital-one ebay facebook goldman-sachs google linkedin mathworks microsoft oracle salesforce sap tripadvisor uber visa vmware yahoo yandex
Word Break 2 - Construct a sentenceHardamazon apple audible bloomberg bookingcom dropbox ebay facebook google microsoft oracle pinterest snapchat twitter uber zillow
Zigzag IteratorMediumamazon apple cruise-automation facebook google microsoft yandex
Validate IP AddressMediumamazon cisco facebook google microsoft twitter uber
Convex PolygonMediumgoogle
Encode String with Shortest LengthHardgoogle
Heaters ProblemMediumamazon google
Magical StringMediumgoogle
Sliding Window MedianHardamazon apple facebook google microsoft snapchat spotify
Shortest Path in a Grid with Obstacles EliminationHarddidi google
Permutation in StringMediumamazon bloomberg facebook google lyft microsoft uber yahoo yandex
Find in Mountain ArrayHardapple google
Fruit Into BasketsMediumamazon google
Number of Closed IslandsMediumamazon facebook google
Number of Ways to Stay in the Same Place After Some StepsHardfacebook google
Time Needed to Inform All EmployeesMediumgoogle
Remove All Adjacent Duplicates In String 1Easyamazon bloomberg facebook google oracle paypal paytm
Diagonal Traverse 2Mediumfacebook google