A Binary Tree is a hierarchical data structure where each node can have at most two children: a left child and a right child. It is one of the most important structures in data structures and algorithms because many interview problems revolve around tree traversal, recursion, and hierarchical data processing.
Binary Trees appear frequently in coding interviews at top tech companies because they test your understanding of recursion, traversal strategies, and problem decomposition. Most solutions rely on patterns such as preorder, inorder, and postorder traversals, often implemented using Recursion or iterative approaches with stacks and queues.
When solving Binary Tree problems, you'll commonly apply:
Practicing Binary Tree problems helps you build intuition for recursion, state propagation, and subtree-based reasoning. With 176 practice questions on TalentD, you can gradually progress from basic traversals to complex interview-level tree algorithms.
Most Binary Tree algorithms are naturally expressed using recursive traversal and subtree processing.
Understanding BST properties helps when working with ordered tree operations and common interview variants.
DFS is the foundation for preorder, inorder, and postorder traversals used in many tree problems.
BFS enables level-order traversal and is essential for problems involving tree layers or shortest depth.
| Status | Title | Video | Leetcode | Solve | Difficulty | Companies | Topics |
|---|---|---|---|---|---|---|---|
| 124. Binary Tree Maximum Path Sum | Solve | Hard | Adobe+14 | ||||
| 272. Closest Binary Search Tree Value II | Solve | Hard | Google+1 | ||||
| 297. Serialize and Deserialize Binary Tree | Solve | Hard | Amazon+8 | ||||
| 431. Encode N-ary Tree to Binary Tree | Solve | Hard | - | ||||
| 968. Binary Tree Cameras | Solve | Hard | Amazon+7 | ||||
| 987. Vertical Order Traversal of a Binary Tree | Solve | Hard | Amazon+4 | ||||
| 1028. Recover a Tree From Preorder Traversal | Solve | Hard | Amazon+2 | ||||
| 1373. Maximum Sum BST in Binary Tree | Solve | Hard | Amazon | ||||
| 1569. Number of Ways to Reorder Array to Get Same BST | Solve | Hard | Google | ||||
| 1597. Build Binary Expression Tree From Infix Expression | Solve | Hard | Amazon+1 | ||||
| 1932. Merge BSTs to Create Single BST | Solve | Hard | - | ||||
| 2005. Subtree Removal Game with Fibonacci Tree | Solve | Hard | Sony | ||||
| 2313. Minimum Flips in Binary Tree to Get Result | Solve | Hard | Google | ||||
| 2458. Height of Binary Tree After Subtree Removal Queries | Solve | Hard | Google | ||||
| 2509. Cycle Length Queries in a Tree | Solve | Hard | Arcesium | ||||
| 2792. Count Nodes That Are Great Enough | Solve | Hard | - |
Start Easy, progress to Hard.
Frequently appear alongside Binary Tree.
Common questions about Binary Tree.
A Binary Tree is a hierarchical data structure where each node has at most two children, called the left and right child. It is widely used for representing hierarchical relationships and solving recursive problems.
It helps to understand recursion, stacks, queues, and basic graph traversal techniques. These concepts make it easier to implement both depth-first and breadth-first tree algorithms.
The main traversals are preorder, inorder, postorder, and level-order. These approaches visit nodes in different sequences and are used to solve a wide range of tree problems.
Binary Trees test multiple skills at once, including recursion, traversal strategies, and divide-and-conquer thinking. They also appear in many real-world structures like search trees and heaps.
Practicing 150+ problems is ideal for mastering patterns such as traversal, subtree recursion, and path-based calculations. Working through a diverse set of questions builds strong problem-solving intuition.