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4301 problems total

Array (1905)Sorting (440)Depth First Search (316)Database (301)Breadth First Search (241)Tree (240)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)
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TitleDifficultyVideosCompanies
Implement Quack Data Structure with Three Stackshard-
google
Water and Jugmedium-
amazongooglelyft
Find Leaves of Binary Treemedium-
amazonatlassianebay
Merge Two Sorted Iteratorsmedium-
two-sigma
Valid Perfect Squareeasy-
amazonfacebookgoogle
Key-Value Store with Max Key Queryhard-
google
Plus One 2 - Given number as Linked List plus onemedium-
amazongoogle
Calculate Courier Active Time from Event Logseasy-
postmates
Range Additionmedium-
google
Solve System of Linear Addition Equationshard-
google
Sum of Two Integersmedium
amazonapplefacebook
Count Digits Without Loopseasy-
amazon
Super Powmedium-
Find K Pairs with Smallest Sumsmedium-
amazonapplefacebook
Guess Number Higher or Lowereasy-
applegooglemicrosoft
Guess Number Higher or Lower IImedium-
adobegoogle
Find Closest Coin by Manhattan Distanceeasy-
google
Wiggle Subsequencemedium-
amazonfacebookuber
Combination Sum 4 - All permutationsmedium-
amazonfacebookgoogle
Kth Smallest Element in a Sorted Matrixmedium-
adobeamazonapple
Design Phone Directorymedium-
dropboxgooglemicrosoft
Insert Delete Search and GetRandom in Constant Time 1 - Dupes not allowedmedium-
adobeaffirmamazon
Convert Hex String to Base64easy-
paypal
Insert Delete Search and GetRandom in Constant Time 2 - Duplicates allowedhard-
affirmamazonapple
Decode Base64 String to Hexeasy-
google
Linked List Random Nodemedium-
amazonfacebookgoogle
Ransom Noteeasy-
amazonapplemicrosoft
Shuffle an Arraymedium-
amazonapplebloomberg
Decrypt XOR-Encoded Hexadecimal Stringmedium-
apple
Mini Parsermedium-
airbnbgoogle
Lexicographical Numbersmedium
adobebloombergbytedance
Explaining API vs SDK to Non-Technical Personmedium-
amazon
First Unique Character in a Stringeasy-
adobeamazonapple
Explaining Web Cookies to Non-Technical Personmedium-
airtable
Longest Absolute File Pathmedium-
amazonapplefacebook
Find the Differenceeasy-
adobeamazongoogle
Elimination Gamemedium-
amazonbloombergquora
Find Missing 1000 Numbers in Large Rangemedium-
two sigma
Perfect Rectanglehard-
applegoogleuber
Is Subsequenceeasy
amazonbloombergcoursera
Find Largest Consecutive Integer Range in Arraymedium-
airbnb
UTF-8 Validationmedium-
amazonapplefacebook
Decode Stringmedium-
alibabaamazonappdynamics
Longest Substring with At Least K Repeating Charactersmedium-
adobeamazonbaidu
Rotate Functionmedium-
amazon
Find Largest Subset of Compatible Jobs (Interval Scheduling)medium-
microsoft
Integer Replacementmedium-
amazonbaidubloomberg
Random Pick Indexmedium-
facebookgoogleuber
Evaluate Divisionmedium-
adobeamazonbloomberg
Nth Digitmedium-
facebookgoogle
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