Here is the collection of the Top 50 list of frequently asked interviews question on Tree. Problems in this Article are divided into three Levels so that readers can practice according to the difficulty level step by step.

Level 1

Problems

• Height of Binary Tree
• Determine if two trees are identical Solve
• Mirror tree Solve
• Symmetric Tree Solve
• Diameter of tree Solve
• Checked for Balanced tree Solve
• Children Sum Parent Solve
• Check for BST Solve
• Array to BST Solve
• Largest value in each level of binary tree Solve
• Maximum GCD of siblings of a binary tree Solve
• Zigzag Tree Traversal Solve
• Inorder Successor in BST Solve
• Kth Largest Element in a BST Solve

Level 2

Problems

• Check if subtree Solve
• Single Valued Subtree Solve
• Unique BSTs Solve
• Inorder Traversal (iterative) Solve
• Preorder Traversal (iterative) Solve
• Postorder Traversal(iterative) Solve
• Vertical Traversal of a Binary Tree Solve
• Boundary Traversal Solve
• Construct Binary Tree from Parent array Solve
• Construct Binary Tree from Preorder and Inorder Traversal Solve
• Preorder Traversal and BST Solve
• Construct tree from preorder traversal Solve
• Minimum distance between two given nodes Solve
• Maximum sum leaf to root path Solve
• Odd Even Level Difference Solve
• Lowest Common Ancestor of a Binary Tree Solve
• Ancestors in Binary Tree Solve
• Remove BST keys outside the given range Solve
• Pair with given target in BST Solve
• Sum Tree Solve
• BST to greater sum tree Solve
• BST to max heap Solve
• Clone binary tree with random pointer Solve
• Maximum sum of non adjacent nodes Solve
• Largest BST in a Binary Tree Solve
• Extreme nodes in alternate order Solve

Level 3

Problems

• Connect nodes at same level Solve
• Nodes at given distance in a Binary Tree Solve
• Sorted Linked List to BST Solve
• Binary Tree to Doubly Linked List Solve
• Maximum sum path between two leaf nodes Solve
• K-Sum Paths Solve
• Number of turns in a binary tree Solve
• Merge two BST’s Solve
• Fixing two nodes of a BST Solve
• Burn Binary Tree Solve

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