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21 problems total

Array (184)Sorting Algorithms (48)Depth First Search (46)Tree (42)Breadth First Search (36)Linked List (30)Stack (29)Recursion (18)Graph Theory (13)Monotonic Stack (10)Queue (7)Shortest Path (3)

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Title	Difficulty	Videos	Companies
Binary Tree Inorder Traversal	easy	-	alibaba amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Binary Tree Traversal - Zigzag Level Order Traversal	medium	-	amazon apple bloomberg
Maximum Depth of Binary Tree	easy		adobe amazon apple
Construct Binary Tree from Inorder and Preorder Traversal	medium		adobe amazon apple
Balanced Binary Tree	easy	-	adobe amazon apple
Path Sum 2 - find all root to leaf paths	medium	-	adobe amazon apple
Flatten binary tree to linked list in order of preorder traversal	medium	-	adobe amazon apple
Binary Tree Path Sum - Maximum between any two nodes	hard		adobe amazon appdynamics
Binary Search Tree BST Inorder Iterator	medium	-	alibaba amazon apple
Binary Tree Right Side View	medium	-	adobe amazon apple
Count Complete Tree Nodes	easy	-	amazon bloomberg bytedance
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Binary Tree Traversal - Vertical Order Traversal	medium	-	adobe amazon bloomberg
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Diameter Of a Binary Tree	easy	-	adobe amazon apple
Basic Calculator 3	hard	-	amazon apple bytedance
All Nodes Distance K in Binary Tree	medium	-	amazon apple bloomberg
Check Completeness of a Binary Tree	medium	-	amazon bytedance facebook
Longest Common Subsequence LCS 1 - Get Length	medium		amazon bytedance facebook
Maximum Product of Splitted Binary Tree	medium	-	amazon bytedance microsoft