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38 problems total

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 Inorder Traversal	easy	-	alibaba amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Recover Binary Search Tree	medium	-	amazon bloomberg facebook
Symmetric Binary Tree	easy	-	adobe alibaba amazon
Binary Tree Level Order Traversal - Level by Level	medium		adobe amazon apple
Maximum Depth of Binary Tree	easy		adobe amazon apple
Path Sum 1 - Check if root to leaf path exists	easy	-	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 Tree Postorder Traversal	easy	-	adobe amazon facebook
Binary Search Tree BST Inorder Iterator	medium	-	alibaba amazon apple
Binary Tree Right Side View	medium	-	adobe amazon apple
Kth Smallest Element in a BST	medium		affirm amazon apple
Lowest Common Ancestor of a Binary Search Tree	medium		adobe amazon bloomberg
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Verify Preorder Sequence in Binary Search Tree	medium	-	mathworks uber zenefits
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Binary Tree Longest Consecutive Sequence	medium	-	amazon facebook google
House Robber 3 - Houses in Binary Tree	medium	-	amazon facebook google
Flatten Nested List Iterator	medium	-	airbnb amazon apple
Convert Binary Search Tree to Sorted Doubly Linked List	medium	-	amazon bloomberg databricks
Construct Quad Tree	medium	-	amazon apple google
Serialize and Deserialize N-Ary Tree	hard	-	amazon apple ebay
Path Sum 3 - Count paths from parent to child	medium	-	amazon bloomberg facebook
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Delete in a Binary Search Tree	medium	-	amazon apple bloomberg
Convert BST to Greater Sum Tree	medium		amazon apple microsoft
Find Duplicate Subtrees	medium	-	amazon bloomberg facebook
Print Binary Tree	medium	-	facebook linkedin microsoft
Maximum Width of Binary Tree	medium	-	amazon bloomberg ebay
Second Minimum Node In a Binary Tree	easy	-	amazon linkedin microsoft
Employee Importance	medium	-	amazon google uber
Basic Calculator 3	hard	-	amazon apple bytedance
All Nodes Distance K in Binary Tree	medium	-	amazon apple bloomberg
Construct Binary Tree from Preorder and Postorder Traversal	medium	-	amazon bloomberg facebook
Binary Tree Cameras	hard	-	ebay facebook google
Distribute Coins in Binary Tree	medium		amazon facebook google
Split Message Based on Limit Problem	hard	-	amazon uber