# Best binary tree interview questions

A binary tree is a fundamental data structure used in computer science and programming. It consists of interconnected nodes, where each node can have at most two children. Binary trees are commonly used for various operations such as searching, sorting, and organizing data efficiently. When it comes to technical interviews, binary tree questions are quite common as they test the candidate’s understanding of data structures and problem-solving skills. In this article, we will explore a list of binary tree interview questions that can help you prepare for your next interview.

Before we dive into the questions, let’s briefly understand the basics of binary trees. A binary tree can be empty, or it can consist of a root node connected to two subtrees called the left subtree and the right subtree. Each node in the tree contains a value and a link to its children nodes. The left subtree contains nodes with values less than the root node, while the right subtree contains nodes with values greater than the root node.

Binary tree interview questions can cover a wide range of topics, including tree traversal algorithms, insertion and deletion operations, finding the height or depth of a tree, and checking if a tree is balanced or symmetric. These questions require a good understanding of tree concepts and efficient problem-solving techniques.

## See these binary tree interview questions

• What is a binary tree?
• What is the difference between a binary tree and a binary search tree?
• What are the different types of tree traversals?
• What is the difference between pre-order, in-order, and post-order traversals?
• How do you perform an in-order traversal of a binary tree iteratively?
• How do you perform a pre-order traversal of a binary tree iteratively?
• How do you perform a post-order traversal of a binary tree iteratively?
• How do you find the height of a binary tree?
• How do you find the depth of a node in a binary tree?
• How do you find the lowest common ancestor of two nodes in a binary tree?
• How do you find the maximum value in a binary tree?
• How do you find the minimum value in a binary tree?
• How do you insert a node in a binary tree?
• How do you delete a node from a binary tree?
• How do you check if a binary tree is balanced?
• How do you check if a binary tree is symmetric?
• How do you check if a binary tree is a binary search tree?
• How do you find the diameter of a binary tree?
• How do you convert a binary tree to its mirror image?
• How do you find the level order traversal of a binary tree?
• How do you find the zigzag level order traversal of a binary tree?
• How do you find the vertical order traversal of a binary tree?
• How do you check if two binary trees are identical?
• How do you check if a binary tree is a subtree of another binary tree?
• How do you find the distance between two nodes in a binary tree?
• How do you print all paths from the root to leaf nodes in a binary tree?
• How do you find the sum of all elements in a binary tree?
• How do you check if a binary tree is a complete binary tree?
• How do you check if a binary tree is a full binary tree?
• How do you find the kth smallest element in a binary search tree?
• How do you find the kth largest element in a binary search tree?
• How do you find the successor of a node in a binary search tree?
• How do you find the predecessor of a node in a binary search tree?
• How do you check if a binary tree is a binary min heap?
• How do you check if a binary tree is a binary max heap?
• How do you convert a binary tree to a doubly linked list?
• How do you find the LCA of two nodes in a binary search tree?
• How do you find the kth largest element in a binary search tree?
• How do you find the kth smallest element in a binary search tree?
• How do you convert a sorted array to a balanced binary search tree?
• How do you convert a sorted linked list to a balanced binary search tree?
• How do you serialize and deserialize a binary tree?
• How do you check if a binary tree is a valid binary search tree?

These are just a few examples of binary tree interview questions that you might come across during your technical interviews. It’s essential to understand the underlying concepts and practice solving these problems efficiently. By familiarizing yourself with these questions and their solutions, you can improve your chances of performing well in your next binary tree interview.