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28 problems total

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)

All Topics(4301)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3945)

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Title	Difficulty	Videos	Companies
Unique BSTs 2 - Generate	medium	-	adobe amazon apple
Unique BSTs 1 - Count	medium	-	adobe amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
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
Construct Binary Tree from Inorder and Preorder Traversal	medium		adobe amazon apple
Binary Tree Traversal - Level Order Bottom up	medium	-	adobe amazon apple
Balanced Binary Tree	easy	-	adobe amazon apple
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
Binary Tree Path Sum - Maximum between any two nodes	hard		adobe amazon appdynamics
Binary Tree Postorder Traversal	easy	-	adobe amazon facebook
Binary Tree Right Side View	medium	-	adobe 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
Binary Tree Path - All root to leaf paths	easy	-	adobe amazon apple
Binary Tree Traversal - Vertical Order Traversal	medium	-	adobe amazon bloomberg
Sum of Left Leaves	easy		adobe amazon bloomberg
Diameter Of a Binary Tree	easy	-	adobe amazon apple
Boundary of Binary Tree	medium	-	adobe amazon apple
Merge Two Binary Trees	easy	-	adobe amazon apple
Trim a Binary Search Tree BST	medium	-	adobe amazon apple
Search in a Binary Search Tree	easy	-	adobe apple google
Kth Largest Element in a Stream	easy		adobe amazon apple
Vertical Order Traversal of a Binary Tree	hard	-	adobe amazon bloomberg
Cousins in Binary Tree	easy	-	adobe amazon bloomberg