Tree Interview Questions

Master 25 tree problems frequently asked in technical interviews. These questions test your understanding of treeconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

Binary Tree Vertical Order Traversal

Asked at Meta

Hash Table Tree Depth-First Search Breadth-First Search Sorting Binary Tree

Rank

#1790MediumFrequency: 91%

Lowest Common Ancestor of a Binary Tree III

Asked at Meta

Hash Table Two Pointers Tree Binary Tree

Rank

#129MediumFrequency: 91%

Sum Root to Leaf Numbers

Asked at Apple

Tree Depth-First Search Binary Tree

Rank

#998MediumFrequency: 87%

Check Completeness of a Binary Tree

Asked at Apple

Tree Breadth-First Search Binary Tree

Rank

#366MediumFrequency: 84%

Find Leaves of Binary Tree

Asked at LinkedIn

Tree Depth-First Search Binary Tree

Rank

#124HardFrequency: 84%

Binary Tree Maximum Path Sum

Asked at Salesforce

Dynamic Programming Tree Depth-First Search Binary Tree

Rank

#772MediumFrequency: 83%

Construct Quad Tree

Asked at Infosys

Array Divide and Conquer Tree Matrix

Rank

#104EasyFrequency: 80%

Maximum Depth of Binary Tree

Asked at Flipkart

Tree Depth-First Search Breadth-First Search Binary Tree

Rank

#236MediumFrequency: 79%

Lowest Common Ancestor of a Binary Tree

Asked at Meta

Tree Depth-First Search Binary Tree

Rank

#109MediumFrequency: 79%

Convert Sorted List to Binary Search Tree

Asked at Flipkart

Linked List Divide and Conquer Tree Binary Search Tree Binary Tree

#10

Rank

#199MediumFrequency: 76%

Binary Tree Right Side View

Asked at Meta

Tree Depth-First Search Breadth-First Search Binary Tree

#11

Rank

#173MediumFrequency: 75%

Binary Search Tree Iterator

Asked at Salesforce

Stack Tree Design Binary Search Tree Binary Tree Iterator

#12

Rank

#543EasyFrequency: 74%

Diameter of Binary Tree

Asked at Meta

Tree Depth-First Search Binary Tree

#13

Rank

#975EasyFrequency: 73%

Range Sum of BST

Asked at Meta

Tree Depth-First Search Binary Search Tree Binary Tree

#14

Rank

#235MediumFrequency: 72%

Lowest Common Ancestor of a Binary Search Tree

Asked at LinkedIn

Tree Depth-First Search Binary Search Tree Binary Tree

#15

Rank

#1029HardFrequency: 69%

Vertical Order Traversal of a Binary Tree

Asked at Oracle

Hash Table Tree Depth-First Search Breadth-First Search Sorting Binary Tree

#16

Rank

#758MediumFrequency: 64%

Convert Binary Search Tree to Sorted Doubly Linked List

Asked at Meta

Linked List Stack Tree Depth-First Search Binary Search Tree Binary Tree Doubly-Linked List

#17

Rank

#893MediumFrequency: 64%

All Nodes Distance K in Binary Tree

Asked at Meta

Hash Table Tree Depth-First Search Breadth-First Search Binary Tree

#18

Rank

#270EasyFrequency: 62%

Closest Binary Search Tree Value

Asked at Meta

Binary Search Tree Depth-First Search Binary Search Tree Binary Tree

#19

Rank

#114MediumFrequency: 53%

Flatten Binary Tree to Linked List

Asked at Google

Linked List Stack Tree Depth-First Search Binary Tree

#20

Rank

#116MediumFrequency: 51%

Populating Next Right Pointers in Each Node

Asked at Meta

Linked List Tree Depth-First Search Breadth-First Search Binary Tree

#21

Rank

#545MediumFrequency: 47%

Boundary of Binary Tree

Asked at Meta

Tree Depth-First Search Binary Tree

#22

Rank

#100EasyFrequency: 44%

Same Tree

Asked at DoorDash

Tree Depth-First Search Breadth-First Search Binary Tree

#23

Rank

#230MediumFrequency: 37%

Kth Smallest Element in a BST

Asked at Meta

Tree Depth-First Search Binary Search Tree Binary Tree

#24

Rank

#103MediumFrequency: 36%

Binary Tree Zigzag Level Order Traversal

Asked at Amazon

Tree Breadth-First Search Binary Tree

#25

Rank

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Tree Interview Questions

Master 25 tree problems frequently asked in technical interviews. These questions test your understanding of treeconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard