Tree Interview Questions

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

Rank

#1790MediumFrequency: 91%

Lowest Common Ancestor of a Binary Tree III

Hash Table Two Pointers Tree Binary Tree

Rank

#366MediumFrequency: 84%

Find Leaves of Binary Tree

Dynamic Programming Tree Depth-First Search Binary Tree

Rank

#124HardFrequency: 83%

Binary Tree Maximum Path Sum

Asked at DoorDash

Rank

#236MediumFrequency: 79%

Lowest Common Ancestor of a Binary Tree

Rank

#199MediumFrequency: 76%

Binary Tree Right Side View

Tree Depth-First Search Breadth-First Search Binary Tree

Rank

#543EasyFrequency: 74%

Diameter of Binary Tree

Rank

#975EasyFrequency: 73%

Range Sum of BST

Tree Depth-First Search Binary Search Tree Binary Tree

Rank

#235MediumFrequency: 72%

Lowest Common Ancestor of a Binary Search Tree

Tree Depth-First Search Binary Search Tree Binary Tree

Rank

#129MediumFrequency: 68%

Sum Root to Leaf Numbers

#10

Rank

#758MediumFrequency: 64%

Convert Binary Search Tree to Sorted Doubly Linked List

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

#11

Rank

#893MediumFrequency: 64%

All Nodes Distance K in Binary Tree

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

#12

Rank

#772MediumFrequency: 63%

Construct Quad Tree

Asked at Uber

Array Divide and Conquer Tree Matrix

#13

Rank

#270EasyFrequency: 62%

Closest Binary Search Tree Value

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

#14

Rank

#1029HardFrequency: 60%

Vertical Order Traversal of a Binary Tree

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

#15

Rank

#998MediumFrequency: 57%

Check Completeness of a Binary Tree

Linked List Stack Tree Depth-First Search Binary Tree

#16

Rank

#114MediumFrequency: 53%

Flatten Binary Tree to Linked List

Asked at Google

#17

Rank

#116MediumFrequency: 51%

Populating Next Right Pointers in Each Node

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

#18

Rank

#173MediumFrequency: 51%

Binary Search Tree Iterator

Stack Tree Design Binary Search Tree Binary Tree Iterator

#19

Rank

#545MediumFrequency: 47%

Boundary of Binary Tree

#20

Rank

#100EasyFrequency: 43%

Same Tree

Tree Depth-First Search Breadth-First Search Binary Tree

#21

Rank

#109MediumFrequency: 37%

Convert Sorted List to Binary Search Tree

Linked List Divide and Conquer Tree Binary Search Tree Binary Tree

#22

Rank

#230MediumFrequency: 37%

Kth Smallest Element in a BST

Tree Depth-First Search Binary Search Tree Binary Tree

#23

Rank

#103MediumFrequency: 36%

Binary Tree Zigzag Level Order Traversal

#24

Rank

#104EasyFrequency: 36%

Maximum Depth of Binary Tree

Tree Depth-First Search 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

Binary Tree Vertical Order Traversal

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

Rank

#1790MediumFrequency: 91%

Lowest Common Ancestor of a Binary Tree III

Hash Table Two Pointers Tree Binary Tree

Rank

#366MediumFrequency: 84%

Find Leaves of Binary Tree

Dynamic Programming Tree Depth-First Search Binary Tree

Rank

#124HardFrequency: 83%

Binary Tree Maximum Path Sum

Asked at DoorDash

Rank

#236MediumFrequency: 79%

Lowest Common Ancestor of a Binary Tree

Rank

#199MediumFrequency: 76%

Binary Tree Right Side View

Tree Depth-First Search Breadth-First Search Binary Tree

Rank

#543EasyFrequency: 74%

Diameter of Binary Tree

Rank

#975EasyFrequency: 73%

Range Sum of BST

Tree Depth-First Search Binary Search Tree Binary Tree

Rank

#235MediumFrequency: 72%

Lowest Common Ancestor of a Binary Search Tree

Tree Depth-First Search Binary Search Tree Binary Tree

Rank

#129MediumFrequency: 68%

Sum Root to Leaf Numbers

#10

Rank

#758MediumFrequency: 64%

Convert Binary Search Tree to Sorted Doubly Linked List

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

#11

Rank

#893MediumFrequency: 64%

All Nodes Distance K in Binary Tree

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

#12

Rank

#772MediumFrequency: 63%

Construct Quad Tree

Asked at Uber

Array Divide and Conquer Tree Matrix

#13

Rank

#270EasyFrequency: 62%

Closest Binary Search Tree Value

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

#14

Rank

#1029HardFrequency: 60%

Vertical Order Traversal of a Binary Tree

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

#15

Rank

#998MediumFrequency: 57%

Check Completeness of a Binary Tree

Linked List Stack Tree Depth-First Search Binary Tree

#16

Rank

#114MediumFrequency: 53%

Flatten Binary Tree to Linked List

Asked at Google

#17

Rank

#116MediumFrequency: 51%

Populating Next Right Pointers in Each Node

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

#18

Rank

#173MediumFrequency: 51%

Binary Search Tree Iterator

Stack Tree Design Binary Search Tree Binary Tree Iterator

#19

Rank

#545MediumFrequency: 47%

Boundary of Binary Tree

#20

Rank

#100EasyFrequency: 43%

Same Tree

Tree Depth-First Search Breadth-First Search Binary Tree

#21

Rank

#109MediumFrequency: 37%

Convert Sorted List to Binary Search Tree

Linked List Divide and Conquer Tree Binary Search Tree Binary Tree

#22

Rank

#230MediumFrequency: 37%

Kth Smallest Element in a BST

Tree Depth-First Search Binary Search Tree Binary Tree

#23

Rank

#103MediumFrequency: 36%

Binary Tree Zigzag Level Order Traversal

#24

Rank

#104EasyFrequency: 36%

Maximum Depth of Binary Tree