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119 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
Find the Index of the First Occurrence in a String	easy	-	adobe amazon apple
Highway Billboard	medium	-	microsoft netapp yahoo
Two Sum	easy		adobe aetion affirm
Add Two Numbers represented as Linked List in Reversed Order	medium	-	adobe aetion airbnb
Longest Substring Without Repeating Characters	medium		adobe alation alibaba
Median of Two Sorted Arrays	hard	-	adobe airbnb alibaba
Longest Palindromic Substring	medium		adobe airbnb alibaba
Reverse Integer	medium	-	adobe amazon apple
Palindrome Number	easy		adobe amazon apple
Container With Most Water	medium		adobe amazon apple
Integer To Roman	medium	-	adobe amazon apple
Roman To Integer	easy		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
Valid Parentheses	easy		adobe airbnb akuna-capital
Merge Two Sorted Linked Lists	easy		adobe airbnb alibaba
Generate Parentheses	medium	-	adobe alibaba amazon
Lexicographically Smallest String with K-Position Moves	easy	-	yahoo
Merge K Sorted Lists	hard		adobe airbnb alibaba
Reverse a directed graph	medium	-	yahoo
Longest Valid Parentheses	hard	-	adobe amazon apple
Search in Rotated Sorted Array	medium		adobe alibaba amazon
Find first and last positions of target element in sorted array	medium	-	airbnb amazon apple
Trapping Rain Water	hard	-	adobe affirm airbnb
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
Kth Permutation Sequence of Numbers 1 to N	hard	-	amazon apple facebook
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
Minimum Window Substring	hard		adobe airbnb amazon
Subsets 1	medium		adobe amazon apple
Word Search 1 - Find if word exists	medium		adobe amazon apple
Merge Two Sorted Arrays	easy	-	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
Maximum Depth of Binary Tree	easy		adobe amazon apple
Construct Binary Tree from Inorder and Preorder Traversal	medium		adobe amazon apple
Convert Sorted Array to height-balanced Binary Search Tree	easy		airbnb amazon apple
Flatten binary tree to linked list in order of preorder traversal	medium	-	adobe amazon apple
Best Time To Buy And Sell Stock 1 - only one transaction	easy		adobe akuna-capital alibaba
Best Time To Buy And Sell Stock 2 - Any number of times	medium	-	adobe amazon apple
Word Ladder 2 - Get all the ladders	hard	-	amazon apple bloomberg
Palindrome Partitioning	medium		adobe amazon bloomberg

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