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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
Number of Ways to Rearrange Sticks With K Sticks Visible	hard	-	facebook
Second Highest Salary Problem	medium	-	adobe amazon apple
Rank Scores	medium	-	adobe amazon apple
Employees Earning More Than Their Managers Problem	easy	-	adobe amazon apple
Game Analysis IV	medium	-	facebook gsn-games
Get Highest Answer Rate Question	medium	-	facebook
Friend Requests I - Overall Acceptance Rate Problem	easy	-	facebook
Friend Requests II - Who Has the Most Friends	medium	-	facebook
Second Degree Follower	medium	-	databricks facebook
Project Employees I	easy	-	facebook
Project Employees II	easy	-	facebook
Project Employees III	medium	-	facebook
Reported Posts	easy	-	facebook
Reported Posts II	medium	-	facebook
User Activity for the Past 30 Days I	easy	-	facebook
User Activity for the Past 30 Days II	easy	-	facebook
Remove All Adjacent Duplicates in String 2	medium	-	bloomberg facebook factset
Queries Quality and Percentage	easy	-	facebook
Report Contiguous Dates	hard	-	facebook
Number of Comments per Post	easy	-	facebook
Minimum Remove to Make Valid Parentheses	medium	-	amazon bloomberg bytedance
Page Recommendations	medium	-	facebook
Number of Ways to Stay in the Same Place After Some Steps	hard	-	facebook google
Ads Performance	easy	-	facebook
Customers Who Bought Products A and B but Not C	medium	-	facebook
Number of Ways to Paint N × 3 Grid	hard	-	akuna-capital facebook
Apples & Oranges	medium	-	facebook
Number of Subsequences That Satisfy the Given Sum Condition	medium	-	facebook google
Lowest Common Ancestor of a Binary Tree 3 - Given Parent Pointer	medium	-	facebook twitter