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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
Binary Tree Traversal - Zigzag Level Order Traversal	medium	-	amazon apple bloomberg
Maximum Depth of Binary Tree	easy		adobe amazon apple
Binary Tree Right Side View	medium	-	adobe amazon apple
Number of Islands	medium		adobe affirm alibaba
Course Schedule 1 - Is it Possible	medium		amazon apple bloomberg
Walls and Gates	medium	-	amazon apple bloomberg
Binary Tree Traversal - Vertical Order Traversal	medium	-	adobe amazon bloomberg
Shortest Distance from All Buildings	hard	-	amazon bytedance facebook
Coin Change with Fewest Number of Coins Given Infinite Supply	medium		adobe affirm airbnb
Longest Increasing Path in a Matrix	hard	-	adobe amazon apple
Trapping Rain Water 2	hard	-	amazon apple bytedance
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Max Area of Island	medium	-	adobe affirm amazon
All Nodes Distance K in Binary Tree	medium	-	amazon apple bloomberg
Check Completeness of a Binary Tree	medium	-	amazon bytedance facebook