TitleDifficultyCompaniesVideos
Peeking IteratorMediumamazon apple atlassian ebay facebook google microsoft oracle yahoo
Populate next pointer to right node in Binary TreeMediumamazon bloomberg facebook google microsoft oracle
Reconstruct Itinerary ProblemHardamazon 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 Digits ProblemMediumadobe amazon bloomberg bytedance didi facebook google microsoft nutanix oracle snapchat vmware
Remove Outermost Parentheses ProblemEasyapple facebook google
Reverse Words in a String 2Mediumamazon microsoft uber vmware google
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
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 Frequency ProblemMediumamazon bloomberg expedia facebook google linkedin uber
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 1 ProblemEasygoogle
Student Attendance Record 2 ProblemHardgoogle uber
Sudoku Solver ProblemHardadobe amazon apple arista-networks doordash dropbox expedia facebook google microsoft oracle riot-games roblox snapchat uber vmware wish
Swap Nodes in PairsMediumadobe amazon apple bloomberg ebay facebook google lyft microsoft oracle sap uber
Valid Number ProblemHardadobe amazon apple facebook google linkedin microsoft tripadvisor
Valid Parenthesis StringMediumalibaba amazon bloomberg facebook google
Valid Sudoku ProblemMediumadobe amazon apple bloomberg cruise-automation doordash facebook google microsoft oracle pinterest roblox salesforce snapchat twitter uber vmware
Validate Binary Search Tree ProblemMediumadobe 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 Address ProblemMediumamazon cisco facebook google microsoft twitter uber
Encode String with Shortest Length ProblemHardgoogle
Magical String ProblemMediumgoogle
Permutation in String ProblemMediumamazon bloomberg facebook google lyft microsoft uber yahoo yandex
Remove All Adjacent Duplicates In String 1Easyamazon bloomberg facebook google oracle paypal paytm
Diagonal Traverse 2 ProblemMediumfacebook google
Most Common Word ProblemEasyamazon apple google microsoft oracle
Linked List Random Node ProblemMediumamazon facebook google
Max Area of Island ProblemMediumadobe affirm amazon apple bloomberg bytedance cruise-automation doordash facebook google intuit mathworks microsoft oracle palantir-technologies qualtrics twitch uber wish zillow
Design Skiplist ProblemHardebay google microsoft pure-storage twitter
Koko Eating Bananas ProblemMediumadobe airbnb amazon facebook google
Number of ProvincesMediumadobe amazon atlassian bloomberg drawbridge ebay facebook goldman-sachs google linkedin microsoft pocket-gems salesforce twitter two-sigma uber
Shortest Path in Binary MatrixMediumamazon facebook google microsoft uber
Similar String Groups ProblemHardamazon facebook google snapchat
Subarray Sum Equals KMediumadobe amazon apple bloomberg ebay expedia facebook goldman-sachs google indeed linkedin microsoft oracle quora snapchat twilio uber wish yahoo yandex
Sum of Distances in Tree ProblemHardgoogle
Island Perimeter ProblemEasyamazon apple bloomberg facebook google microsoft
All O`one Data Structure ProblemHardamazon bloomberg facebook google linkedin microsoft uber
Flatten a Multilevel Doubly Linked List ProblemMediumamazon apple bloomberg facebook google microsoft uber
K-th Smallest in Lexicographical Order ProblemHardbytedance google hulu
Valid Word SquareEasybloomberg google
Add Strings ProblemEasyadobe airbnb amazon apple bloomberg bytedance facebook google microsoft nvidia oracle snapchat square
Binary Watch ProblemEasyapple google