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42 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)

All Topics(4301)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3944)

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Title	Difficulty	Videos	Companies
Calculating the mean and median of an unsorted array	easy	-	uber
Reverse Integer	medium	-	adobe amazon apple
Object-Oriented Design for Task/Job Scheduler	hard	-	uber
Next Permutation	medium	-	adobe amazon apple
Longest Valid Parentheses	hard	-	adobe amazon apple
Valid Sudoku	medium		adobe amazon apple
Sudoku Solver	hard	-	adobe amazon apple
Combination Sum 1	medium		airbnb akuna-capital amazon
Jump Game 2 - Get min jumps	medium	-	adobe amazon apple
Permutations of Array 1	medium	-	adobe amazon apple
Permutations of Array 2 - Array has duplicates	medium	-	adobe amazon apple
Spiral Matrix 1 - Return	medium		adobe amazon apple
Search a 2D Matrix 1 - Elements sorted row-wise and first integer of each row is greater than last element of previous row is greater than last element of previous row	medium	-	adobe amazon apple
Best Time To Buy And Sell Stock 1 - only one transaction	easy		adobe akuna-capital alibaba
Binary Tree Path Sum - Maximum between any two nodes	hard		adobe amazon appdynamics
Surrounded Regions	medium	-	amazon ebay facebook
Friend Words - One Edit Distance	medium	-	amazon facebook google
Fraction to Recurring Decimal	medium	-	airbnb amazon apple
Excel Sheet Column Number	easy	-	amazon apple bloomberg
Rotate an Array to Right	medium	-	amazon bloomberg cisco
Flatten 2D Vector	medium	-	airbnb apple facebook
Trips and Users	hard	-	amazon uber
Generate nth ugly number	medium	-	amazon oracle uber
Find Median from Data Stream	hard		adobe amazon apple
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Remove Invalid Parentheses Problem	hard	-	amazon apple bloomberg
Top K Frequent Elements	medium		amazon apple bloomberg
Design Snake Game	medium	-	amazon apple bloomberg
Design Hit Counter	medium	-	affirm amazon apple
Random Pick Index	medium	-	facebook google uber
Convert Binary Search Tree to Sorted Doubly Linked List	medium	-	amazon bloomberg databricks
Path Sum 3 - Count paths from parent to child	medium	-	amazon bloomberg facebook
Reverse Pairs	hard	-	amazon bytedance google
Permutation in String	medium	-	amazon bloomberg facebook
Falling Squares	hard	-	amazon square uber
Delete and Earn	medium	-	akuna-capital pocket-gems uber
Cherry Pickup	hard	-	adobe akuna-capital amazon
Basic Calculator 3	hard	-	amazon apple bytedance
Custom Sort String	medium	-	amazon facebook google
Minimum Cost For Tickets	medium	-	amazon facebook google
Palindrome Partitioning III	hard	-	apple uber
Split Message Based on Limit Problem	hard	-	amazon uber