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Array (174)Sorting (45)Depth First Search (44)Tree (41)Breadth First Search (35)Linked List (28)Stack (27)Recursion (18)Graph Theory (12)Monotonic Stack (8)Queue (6)Shortest Path (2)

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Title	Difficulty	Videos	Companies
Word Search 1 - Find if word exists	medium		adobe amazon apple
Binary Tree Inorder Traversal	easy	-	alibaba amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Maximum Depth of Binary Tree	easy		adobe amazon apple
Balanced Binary Tree	easy	-	adobe amazon apple
Course Schedule 2 - Get Ordered Courses	medium	-	airbnb amazon apple
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Longest Increasing Path in a Matrix	hard	-	adobe amazon apple
Reconstruct Itinerary	hard	-	amazon apple bloomberg
The Maze 1 - Can the Ball Stop at Destination	medium	-	amazon apple facebook
Diameter Of a Binary Tree	easy	-	adobe amazon apple
All Nodes Distance K in Binary Tree	medium	-	amazon apple bloomberg