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219 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
Count elements in range in sorted matrix	hard	-	google
Count Knight's Tour	hard	-	google
Distributed Wikipedia Crawler System Design	hard	-	google
Median of Two Sorted Arrays	hard	-	adobe airbnb alibaba
Regular Expression Matching	hard	-	adobe airbnb alibaba
Largest value path in a directed graph	hard	-	google
Low bandwidth almost similar file syncing algorithm between two computers	hard	-	google
Merge K Sorted Lists	hard		adobe airbnb alibaba
Minimum Cost to Make at Least One Valid Path in a Grid	hard	-	google
Numbers Of Length N and Values Less Than K	hard	-	google
PageRank Algorithm Implementation	hard	-	google
Split string into fewest palindromic substrings	hard	-	google
K Reverse a linked list	hard	-	adobe amazon apple
Substring with Concatenation of All Words	hard	-	adobe amazon apple
Longest Valid Parentheses	hard	-	adobe amazon apple
Sudoku Solver	hard	-	adobe amazon apple
First Missing Positive	hard	-	adobe amazon apple
Trapping Rain Water	hard	-	adobe affirm airbnb
Wildcard Matching	hard	-	adobe amazon bloomberg
N-Queens	hard	-	adobe amazon apple
Kth Permutation Sequence of Numbers 1 to N	hard	-	amazon apple facebook
Valid Number	hard	-	adobe amazon apple
Text Justification	hard	-	airbnb amazon apple
Minimum Window Substring	hard		adobe airbnb amazon
Largest Rectangle in Histogram	hard	-	adobe amazon bloomberg
Maximal Rectangle	hard	-	adobe amazon bloomberg
Scramble String	hard	-	apple google
Distinct Subsequences	hard	-	adobe amazon barclays
Best Time To Buy And Sell Stock 3 - at most twice	hard	-	amazon apple atlassian
Binary Tree Path Sum - Maximum between any two nodes	hard		adobe amazon appdynamics
Word Ladder 2 - Get all the ladders	hard	-	amazon apple bloomberg
Word Ladder 1 - Get Ladder Length	hard	-	affirm amazon apple
Palindrome Partitioning II	hard	-	amazon google
Candy distribution	hard	-	amazon apple google
Word Break 2 - Construct a sentence	hard		amazon apple audible
Maximum Points on a Line	hard	-	amazon apple bloomberg
Find Minimum in Rotated Sorted Array 2 - Duplicates allowed	hard	-	adobe amazon facebook
Read N Characters Given Read4 2 - Call Multiple Times	hard	-	amazon bloomberg facebook
Dungeon Game	hard	-	amazon google microsoft
Department Top Three Salaries Problem	hard	-	adobe amazon google
Best Time To Buy And Sell Stock 4 - at most k times	hard	-	amazon apple bloomberg
Word Search 2 - Return All Words	hard		airbnb amazon apple
Shortest Palindrome 1 - Prepending characters	hard	-	adobe amazon bloomberg
Skyline Problem	hard	-	adobe amazon apple
Contains Duplicate 3 - within k distance and t difference	hard	-	adobe airbnb apple
Basic Calculator 1	hard	-	adobe amazon bloomberg
Sliding Window Maximum	hard	-	adobe alibaba amazon
Strobogrammatic Number 3 - Count in Range	hard	-	facebook google
Paint House 2 - N houses with k colors with no two adjacent houses with same color color	hard	-	facebook google linkedin
Alien Dictionary	hard		airbnb amazon apple

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