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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
Inorder Successor in Binary Search Tree	medium	-	amazon bloomberg citadel
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Reconstruct Itinerary	hard	-	amazon apple bloomberg