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12 problems total

Array (1906)Sorting (442)Depth First Search (316)Database (301)Breadth First Search (241)Tree (241)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)

All Topics(4301)Database(305)Java(0)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3945)

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Title	Difficulty	Videos	Companies
Two Sum	easy		adobe aetion affirm
Valid Parentheses	easy		adobe airbnb akuna-capital
Merge Two Sorted Linked Lists	easy		adobe airbnb alibaba
Convert Sorted Array to height-balanced Binary Search Tree	easy		airbnb amazon apple
Single Number 1 - All elements except one occur twice	easy		adobe airbnb amazon
Intersection of Two Linked Lists	easy	-	airbnb alibaba amazon
Reverse Bits	easy		airbnb amazon apple
Happy Number	easy	-	adobe airbnb amazon
Contains Duplicate 1 - Check if array has duplicates	easy		adobe airbnb amazon
Contains Duplicate 2 - within k distance	easy	-	adobe airbnb amazon
Add Strings	easy	-	adobe airbnb amazon
Verifying an Alien Dictionary	easy	-	airbnb amazon facebook