All TopicsAlgorithmsBackend
DesignConcurrencyDatabaseDatabase
DesignJavaJavascriptObject Oriented
DesignProgramming
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Populate next pointer to right node in Binary TreeMediumamazon bloomberg facebook google microsoft oracle
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
Reverse Words in a String 3Easyamazon apple bloomberg microsoft paypal salesforce snapchat yahoo zappos
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
Select Copy Paste 1 - Minimum operationsMediumbloomberg 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
Swap Nodes in PairsMediumadobe amazon apple bloomberg ebay facebook google lyft microsoft oracle sap uber
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
Implement Rand10() Using Rand7()Mediumapple bloomberg bytedance linkedin microsoft
Permutation in StringMediumamazon bloomberg facebook google lyft microsoft uber yahoo yandex
Remove All Adjacent Duplicates In String 1Easyamazon bloomberg facebook google oracle paypal paytm
Find Duplicate SubtreesMediumamazon bloomberg facebook google lyft microsoft oracle uber
Max Area of IslandMediumadobe affirm amazon apple bloomberg bytedance cruise-automation doordash facebook google intuit mathworks microsoft oracle palantir-technologies qualtrics twitch uber wish zillow
Design Browser HistoryMediumbloomberg
Number of ProvincesMediumadobe amazon atlassian bloomberg drawbridge ebay facebook goldman-sachs google linkedin microsoft pocket-gems salesforce twitter two-sigma uber
Subarray Sum Equals KMediumadobe amazon apple bloomberg ebay expedia facebook goldman-sachs google indeed linkedin microsoft oracle quora snapchat twilio uber wish yahoo yandex
Island PerimeterEasyamazon apple bloomberg facebook google microsoft
All O`one Data StructureHardamazon bloomberg facebook google linkedin microsoft uber
Find All Duplicates in an ArrayMediumamazon apple bloomberg facebook google lyft microsoft pocket-gems
Flatten a Multilevel Doubly Linked ListMediumamazon apple bloomberg facebook google microsoft uber
Valid Word SquareEasybloomberg google
Add StringsEasyadobe airbnb amazon apple bloomberg bytedance facebook google microsoft nvidia oracle snapchat square
Daily TemperaturesMediumadobe amazon apple bloomberg cisco expedia facebook goldman-sachs google linkedin microsoft nvidia uber zillow
Path Sum 3 - Count paths from parent to childMediumamazon bloomberg facebook microsoft oracle quora uber zillow
Maximum Subarray SumMediumadobe alibaba amazon apple asana atlassian bloomberg bytedance capital-one cisco citadel ebay expedia facebook goldman-sachs google ibm intel jpmorgan linkedin microsoft morgan-stanley nvidia oracle palantir-technologies paypal qualcomm salesforce sap two-sigma uber visa wayfair yahoo zillow
Find the Index of the First Occurrence in a StringEasyadobe amazon apple bloomberg citadel dropbox ebay facebook google microsoft oracle paypal pocket-gems vmware yahoo yandex
Hand of StraightsMediumbloomberg coupang ebay google
Convert Binary Search Tree to Sorted Doubly Linked ListMediumamazon bloomberg databricks facebook google lyft microsoft oracle uber vmware
Sparse Matrix MultiplicationMediumamazon apple bloomberg facebook google linkedin microsoft snapchat uber
Vertical Order Traversal of a Binary TreeHardadobe amazon bloomberg databricks facebook google linkedin microsoft reddit samsung
Evaluate DivisionMediumadobe amazon bloomberg facebook google microsoft uber
Integer ReplacementMediumamazon baidu bloomberg google microsoft
Longest Substring with At Least K Repeating CharactersMediumadobe amazon baidu bloomberg bytedance facebook google uber
Peak Index in a Mountain ArrayMediumamazon bloomberg facebook google microsoft quora uber
Elimination GameMediumamazon bloomberg quora
Lexicographical NumbersMediumadobe bloomberg bytedance google
Next Greater Element 2Mediumamazon bloomberg facebook google microsoft oracle yahoo
Design Hit CounterMediumaffirm amazon apple atlassian bloomberg bookingcom dropbox google indeed linkedin microsoft netflix oracle pinterest quip snapchat uber visa yahoo zillow
Managers with at Least 5 Direct Reports ProblemMediumamazon bloomberg
Flatten Nested List IteratorMediumairbnb amazon apple atlassian bloomberg ebay facebook google linkedin lyft microsoft oracle pinterest snapchat splunk twitter uber vmware