Last Updated: 3 Nov, 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.
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Backtracking
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Binary Trees
Breadth-first Search
Depth-first Search
Dynamic Programming
Graph
Greedy
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Stacks & Queues
Trees
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Categories
Problem Title
Exp
Difficulty
Avg. time
Attempted
Upvotes
80
Moderate
30 mins
5.7k
86
80
Moderate
20 mins
1.6k
37
40
Easy
20 mins
13.4k
58
80
Moderate
27 mins
1.5k
26
80
Moderate
20 mins
2.9k
25
80
Moderate
38 mins
13.5k
66
80
Moderate
30 mins
10.6k
63
80
Moderate
35 mins
11k
58
120
Hard
20 mins
55.3k
525
40
Easy
15 mins
18.5k
92
80
Moderate
20 mins
21.6k
67
80
Moderate
25 mins
32.1k
79
80
Moderate
30 mins
2.3k
20
80
Moderate
25 mins
3.3k
34
120
Hard
20 mins
7.3k
74
40
Easy
15 mins
5.4k
34
40
Easy
15 mins
1.2k
8
80
Moderate
10 mins
0.7k
13
40
Easy
10 mins
3.6k
42
40
Easy
10 mins
24.1k
170
80
Moderate
15 mins
17.7k
63
120
Hard
15 mins
7k
70
80
Moderate
10 mins
11.2k
72
80
Moderate
15 mins
15.3k
58
40
Easy
15 mins
1.6k
16
1
2
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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.