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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)

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
Two Sum	easy		adobe aetion affirm
Longest Substring Without Repeating Characters	medium		adobe alation alibaba
3Sum0 - Find three elements in an array that sum to a zero	medium		adobe akuna-capital alibaba
Valid Parentheses	easy		adobe airbnb akuna-capital
Search in Rotated Sorted Array	medium		adobe alibaba amazon
Sudoku Solver	hard	-	adobe amazon apple
Multiply Strings	medium	-	amazon apple expedia
Maximum Subarray Sum	medium		adobe alibaba amazon
Set Matrix Zeros	medium		adobe amazon apple
Merge Two Sorted Arrays	easy	-	adobe amazon apple
Decode Ways	medium		adobe amazon apple
Unique BSTs 1 - Count	medium	-	adobe amazon apple
Binary Tree Level Order Traversal - Level by Level	medium		adobe amazon apple
Best Time To Buy And Sell Stock 1 - only one transaction	easy		adobe akuna-capital alibaba
Word Ladder 1 - Get Ladder Length	hard	-	affirm amazon apple
Gas Station	medium	-	amazon apple bloomberg
Copy List with Random Pointer	medium	-	adobe amazon apple
Design LRU Cache	medium	-	adobe alibaba amazon
Intersection of Two Linked Lists	easy	-	airbnb alibaba amazon
2Sum 2 – Input array is sorted	medium		amazon apple bloomberg
House Robber	medium		adobe airbnb amazon
Number of Islands	medium		adobe affirm alibaba
Kth Largest Element in an Array	medium	-	adobe airbnb alibaba
Search a 2D Matrix 2 - Rows and columns are sorted	medium	-	adobe amazon apple
Valid Anagram	easy		amazon apple bloomberg
Maximum Intervals Overlap Count	medium		amazon apple atlassian
Find Median from Data Stream	hard		adobe amazon apple
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Binary Tree Traversal - Vertical Order Traversal	medium	-	adobe amazon bloomberg
Sum of Left Leaves	easy		adobe amazon bloomberg
String Compression	medium	-	akuna-capital amazon apple
Sort Characters By Frequency	medium	-	amazon bloomberg expedia
Subarray Sum Equals K	medium	-	adobe amazon apple
Valid Triangle Number	medium	-	amazon bloomberg expedia
Top K Frequent Words	medium	-	adobe amazon apple
Subarray Product Less Than K	medium	-	akuna-capital atlassian coursera
Find Pivot Index	easy	-	amazon apple bloomberg
Daily Temperatures	medium	-	adobe amazon apple
Uncommon Words from Two Sentences	easy		amazon expedia facebook
K closest Points to Origin	medium	-	amazon apple asana
Subarray Sums Divisible by K	medium		amazon bytedance expedia
The Earliest Moment When Everyone Become Friends	medium	-	expedia
Minimum Swaps to Group All 1's Together 1 - In an array	medium	-	expedia
Find the Smallest Divisor Given a Threshold	medium	-	bytedance expedia salesforce
Break a Palindrome	medium	-	expedia jpmorgan roblox
Rearrange Words in a Sentence	medium	-	expedia
The kth Factor of n	medium	-	expedia