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58 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 1 - Count	medium	-	adobe amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Recover Binary Search Tree	medium	-	amazon bloomberg facebook
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
Construct Binary Tree from Inorder and Postorder Traversal	medium	-	amazon bloomberg facebook
Convert Sorted Array to height-balanced Binary Search Tree	easy		airbnb amazon apple
Convert Sorted List into a height-balanced Binary search Tree	medium	-	amazon bloomberg facebook
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
Populate next pointer to right node in Perfect Binary Tree	medium	-	amazon apple bloomberg
Populate next pointer to right node in Binary Tree	medium	-	amazon bloomberg facebook
Binary Tree Path Sum - Maximum between any two nodes	hard		adobe amazon appdynamics
Sum Root to Leaf Numbers	medium	-	amazon bloomberg ebay
Binary Tree Preorder Traversal	easy	-	amazon bloomberg cisco
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
Invert Binary Tree	easy		amazon apple bloomberg
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
Count Univalue Subtrees	medium	-	amazon bloomberg box
Closest Binary Search Tree Value	easy	-	amazon bloomberg facebook
Inorder Successor in Binary Search Tree	medium	-	amazon bloomberg citadel
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Binary Tree Traversal - Vertical Order Traversal	medium	-	adobe amazon bloomberg
Flatten Nested List Iterator	medium	-	airbnb amazon apple
Sum of Left Leaves	easy		adobe amazon bloomberg
Convert Binary Search Tree to Sorted Doubly Linked List	medium	-	amazon bloomberg databricks
Path Sum 3 - Count paths from parent to child	medium	-	amazon bloomberg facebook
Delete in a Binary Search Tree	medium	-	amazon apple bloomberg
Inorder Successor in Binary Search Tree Using Parent link	medium	-	bloomberg google microsoft
Find Bottom Left Tree Value	medium	-	bloomberg microsoft
Diameter Of a Binary Tree	easy	-	adobe amazon apple
Maximum Depth of N-ary Tree	easy	-	amazon bloomberg google
Subtree of Another Tree	easy		amazon bloomberg ebay
Kill Process	medium	-	amazon apple bloomberg
Merge Two Binary Trees	easy	-	adobe amazon apple
Find Duplicate Subtrees	medium	-	amazon bloomberg facebook
Maximum Width of Binary Tree	medium	-	amazon bloomberg ebay
Trim a Binary Search Tree BST	medium	-	adobe amazon apple
Kth Largest Element in a Stream	easy		adobe amazon apple

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