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47 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
Unique BSTs 2 - Generate	medium	-	adobe amazon apple
Unique BSTs 1 - Count	medium	-	adobe amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Same Tree	easy		amazon apple bloomberg
Symmetric Binary Tree	easy	-	adobe alibaba amazon
Binary Tree Level Order Traversal - Level by Level	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
Binary Tree Traversal - Level Order Bottom up	medium	-	adobe amazon apple
Convert Sorted Array to height-balanced Binary Search Tree	easy		airbnb amazon apple
Balanced Binary Tree	easy	-	adobe amazon apple
Minimum Depth of Binary Tree	easy	-	amazon apple facebook
Path Sum 1 - Check if root to leaf path exists	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
Populate next pointer to right node in Perfect Binary Tree	medium	-	amazon apple bloomberg
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
Invert Binary Tree	easy		amazon apple bloomberg
Kth Smallest Element in a BST	medium		affirm amazon apple
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Binary Tree Path - All root to leaf paths	easy	-	adobe amazon apple
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Largest Binary Search Tree BST Subtree	medium	-	amazon apple facebook
Flatten Nested List Iterator	medium	-	airbnb amazon apple
Construct Quad Tree	medium	-	amazon apple google
Serialize and Deserialize N-Ary Tree	hard	-	amazon apple ebay
Delete in a Binary Search Tree	medium	-	amazon apple bloomberg
Most Frequent Subtree Sum	medium	-	amazon apple
Find Largest Value in Each Tree Row	medium		amazon apple facebook
Minimum Absolute Difference in BST	easy	-	amazon apple google
Convert BST to Greater Sum Tree	medium		amazon apple microsoft
Diameter Of a Binary Tree	easy	-	adobe amazon apple
Boundary of Binary Tree	medium	-	adobe amazon apple
Binary Tree Longest Consecutive Sequence II	medium	-	amazon apple facebook
Kill Process	medium	-	amazon apple bloomberg
Merge Two Binary Trees	easy	-	adobe amazon apple
Trim a Binary Search Tree BST	medium	-	adobe amazon apple
Longest Univalue Path	medium	-	amazon apple google
Search in a Binary Search Tree	easy	-	adobe apple google
Kth Largest Element in a Stream	easy		adobe amazon apple
All Nodes Distance K in Binary Tree	medium	-	amazon apple bloomberg
Range Sum of BST	easy	-	amazon apple facebook
Sum of Nodes with Even-Valued Grandparent	medium	-	amazon apple

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