Last Updated: 19 Apr, 2025
Top Trees Interview Questions
You can expect tree questions in many of the top company interviews. Tree coding questions range from smooth and clear tree traversal and searching to complex problems like balancing binary trees or implementing tries. If you are looking for the tree interview questions, you are at the right place. Improve your tree problem solving ability by practicing tree problems here.
Difficulty
Companies
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Hot topics
Arrays
Backtracking
Binary Search
Binary Search Trees
Binary Trees
Breadth-first Search
Depth-first Search
Divide and Conquer
Dynamic Programming
Graph
Greedy
Hash Table
Heap
Linked List
Recursion
Categories
Problem Title
Exp
Difficulty
Avg. time
Attempted
Upvotes
80
Moderate
30 mins
5k
86
80
Moderate
20 mins
1.5k
37
40
Easy
20 mins
12.4k
57
80
Moderate
27 mins
1.4k
26
80
Moderate
20 mins
2.6k
24
80
Moderate
38 mins
12.9k
65
80
Moderate
30 mins
9.5k
60
80
Moderate
35 mins
9.9k
55
120
Hard
20 mins
51.4k
502
40
Easy
15 mins
17k
86
80
Moderate
20 mins
20.4k
63
80
Moderate
25 mins
30k
78
80
Moderate
30 mins
2.2k
20
80
Moderate
25 mins
3k
33
120
Hard
20 mins
6.7k
72
40
Easy
15 mins
5k
31
40
Easy
15 mins
1.1k
8
80
Moderate
10 mins
0.6k
13
40
Easy
10 mins
3.2k
41
40
Easy
10 mins
22.2k
166
80
Moderate
15 mins
16.4k
61
120
Hard
15 mins
6.6k
68
80
Moderate
10 mins
10.4k
66
80
Moderate
15 mins
14.6k
58
40
Easy
15 mins
1.5k
16
1
2
3
4
Frequently Asked Questions
How to approach a tree question?
The first step is to solve the base case, i.e., for the leaf nodes. The second step is to build the tree recursively. Like if you know the answer for the left and right subtree, deduce a formula to find the answer for their parent.
What is a tree in algorithm?
A tree is an hierarchical data structure consisting of various nodes that are connected to each other with edges. A tree originates from one node, which is called the root node. All the nodes (except the root ) have one parent but can have several children.
How to start studying Tree Interview Questions?
I would recommend taking a tree interview questions sheet and solving all the questions one by one. If you get stuck on any problem, check which topic the problem belongs to and give that topic a brief read.
What is the best way to answer Trees Interview Questions?
To answer a tree interview question, follow a two-step approach. First, solve the problem for all the leaf nodes. Secondly, build the tree recursively by figuring out the answer for the parent node given the answer for its left and right sub-tree.