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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)

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Title	Difficulty	Videos	Companies
Highway Billboard	medium	-	microsoft netapp yahoo
Add Two Numbers represented as Linked List in Reversed Order	medium	-	adobe aetion airbnb
Longest Substring Without Repeating Characters	medium		adobe alation alibaba
Longest Palindromic Substring	medium		adobe airbnb alibaba
Reverse Integer	medium	-	adobe amazon apple
Container With Most Water	medium		adobe amazon apple
Integer To Roman	medium	-	adobe amazon apple
3Sum0 - Find three elements in an array that sum to a zero	medium		adobe akuna-capital alibaba
Letter Combinations of a Phone Number	medium	-	amazon apple atlassian
4Sum	medium	-	adobe amazon apple
Generate Parentheses	medium	-	adobe alibaba amazon
Reverse a directed graph	medium	-	yahoo
Search in Rotated Sorted Array	medium		adobe alibaba amazon
Find first and last positions of target element in sorted array	medium	-	airbnb amazon apple
Permutations of Array 1	medium	-	adobe amazon apple
Group Anagrams	medium		adobe affirm amazon
Maximum Subarray Sum	medium		adobe alibaba amazon
Merge Overlapping Intervals	medium		adobe alibaba amazon
Unique Paths in Grid 2 - Count all paths moving right or down with obstacles	medium	-	amazon apple bloomberg
Edit Distance	medium	-	adobe amazon apple
Dutch National Flag DNF	medium		amazon apple bloomberg
Subsets 1	medium		adobe amazon apple
Word Search 1 - Find if word exists	medium		adobe amazon apple
Restore IP Addresses	medium	-	adobe amazon apple
Unique BSTs 2 - Generate	medium	-	adobe amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Binary Tree Level Order Traversal - Level by Level	medium		adobe amazon apple
Binary Tree Traversal - Zigzag Level Order Traversal	medium	-	amazon apple bloomberg
Construct Binary Tree from Inorder and Preorder Traversal	medium		adobe amazon apple
Flatten binary tree to linked list in order of preorder traversal	medium	-	adobe amazon apple
Best Time To Buy And Sell Stock 2 - Any number of times	medium	-	adobe amazon apple
Palindrome Partitioning	medium		adobe amazon bloomberg
Copy List with Random Pointer	medium	-	adobe amazon apple
Word Break 1 - Check if word is breakable	medium		adobe amazon apple
Design LRU Cache	medium	-	adobe alibaba amazon
Find Peak Element in a Given Array	medium	-	amazon apple bloomberg
Second Highest Salary Problem	medium	-	adobe amazon apple
Rank Scores	medium	-	adobe amazon apple
Number of Islands	medium		adobe affirm alibaba
Count Primes	medium	-	adobe amazon apple
Course Schedule 1 - Is it Possible	medium		amazon apple bloomberg
Kth Largest Element in an Array	medium	-	adobe airbnb alibaba
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Delete non-tail Node in linked list, Given only access to that Node	medium		adobe amazon apple
Product of Array Except Self	medium		adobe amazon apple
Search a 2D Matrix 2 - Rows and columns are sorted	medium	-	adobe amazon apple
Prune Unary nodes to form Full Binary Tree	medium	-	yahoo
Single Number 3 - All elements except two occur twice	medium	-	amazon apple facebook
H-Index	medium	-	adobe bloomberg facebook
Peeking Iterator	medium	-	amazon apple atlassian

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