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Array (1906)Sorting (442)Depth First Search (316)Database (301)Breadth First Search (241)Tree (241)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)

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Title	Difficulty	Videos	Companies
Binary Tree Path Sum - Maximum between any two leaves	medium	-
Check if postordered array forms a binary search tree	medium	-
Delete a binary tree completely	medium	-
Evaluation of Arithmetic Expression Tree	medium	-	microsoft
Postorder Node Iterator of Binary Tree	medium	-
Maximum Depth of Binary Tree	easy		adobe amazon apple
Construct Binary Tree from Inorder and Postorder Traversal	medium	-	amazon bloomberg facebook
Binary Tree Postorder Traversal	easy	-	adobe amazon facebook
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Find Duplicate Subtrees	medium	-	amazon bloomberg facebook
Sum of Distances in Tree	hard	-	google
Binary Tree Cameras	hard	-	ebay facebook google
Distribute Coins in Binary Tree	medium		amazon facebook google
Delete Nodes And Return Forest	medium		amazon google
Lowest Common Ancestor of Deepest Leaves	medium	-	bloomberg facebook google
Delete Leaves With a Given Value	medium		amazon google
Number of Good Leaf Nodes Pairs	medium		google