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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)

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Title	Difficulty	Videos	Companies
Construct K Palindrome Strings	medium		uber
Add Two Numbers represented as Linked List in Reversed Order	medium	-	adobe aetion airbnb
Reverse Integer	medium	-	adobe amazon apple
Roman To Integer	easy		adobe amazon apple
Multiply Strings	medium	-	amazon apple expedia
Rotate n x n matrix by 90 degrees	medium		adobe akuna-capital amazon
Implement Power Function 1	medium	-	adobe amazon apple
Unique Paths in Grid 1 - Count all paths moving right or down	medium		adobe alibaba amazon
Plus One 1 - Given number as array plus one	easy	-	adobe amazon apple
Square root of an integer	easy	-	amazon apple bloomberg
Climbing Stairs - Take atmost 2 Steps	easy		adobe alibaba amazon
Maximum Points on a Line	hard	-	amazon apple bloomberg
Evaluate Reverse Polish Notation	medium	-	amazon atlassian facebook
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
Happy Number	easy	-	adobe airbnb amazon
Basic Calculator 1	hard	-	adobe amazon bloomberg
Basic Calculator 2 Problem	medium	-	airbnb amazon apple
Generate nth ugly number	medium	-	amazon oracle uber
Integer to English Words	hard		amazon apple barclays
Least Number of Perfect Squares that Sums to n	medium	-	adobe amazon apple
Expression Add Operators	hard	-	apple bytedance facebook
Water and Jug	medium	-	amazon google lyft
Insert Delete Search and GetRandom in Constant Time 1 - Dupes not allowed	medium	-	adobe affirm amazon
Insert Delete Search and GetRandom in Constant Time 2 - Duplicates allowed	hard	-	affirm amazon apple
Random Pick Index	medium	-	facebook google uber
Add Two Numbers represented as Linked List in Forward order	medium	-	amazon apple bloomberg
Predict the Winner	medium	-	amazon apple google
Random Pick with Weight	medium	-	amazon apple atlassian
Find the Closest Palindrome	hard	-	amazon facebook google
Solve the Equation	medium	-	amazon google uber
Kth Smallest Number in Multiplication Table	hard	-	google uber
Maximum Swap	medium		amazon apple bytedance
24 Game	hard	-	amazon facebook google
Random Pick with Blacklist	hard	-	amazon google two-sigma
Basic Calculator 3	hard	-	amazon apple bytedance
Reaching Points	hard	-	coursera goldman-sachs google
Split Array With Same Average	hard	-	amazon google microsoft
Consecutive Numbers Sum	hard	-	citadel citrix indeed
New 21 Game	medium	-	apple google uber
Binary Tree Cameras	hard	-	ebay facebook google
K closest Points to Origin	medium	-	amazon apple asana
Minimum Score Triangulation of Polygon	medium	-	uber
Subtract the Product and Sum of Digits of an Integer	easy	-	google quora uber
Split Message Based on Limit Problem	hard	-	amazon uber