A complete binary tree is a special type of binary tree in data structure that has a unique property. In a complete binary tree, all levels of the tree are fully filled except possibly for the last level, which is filled from left to right.

To better understand what this means, let’s take a look at some examples:

## Example 1:

Consider the following binary tree:

1
/ \
2 3
/ \ /
4 5 6

This is not a complete binary tree because the last level is not fully filled. The node with value 6 is missing its left child.

## Example 2:

Now let’s consider another binary tree:

1
/ \
2 3
/ \ / \
4 5 6 7

This is a complete binary tree because all levels are fully filled. Each level has the maximum number of nodes possible except for the last level, which is filled from left to right.

## Properties of Complete Binary Trees:

A complete binary tree has some interesting properties:

**All levels except possibly the last level are completely filled.** This means that all nodes on each level have two children, except for the last level which may be partially filled from left to right.
**All nodes in the last level are as far left as possible.** This property ensures that there are no gaps between nodes in the last level. If there is any gap, then it should be towards the right side.
**The height of a complete binary tree is the minimum possible.** This means that a complete binary tree with n nodes has a height of log_{2}n.

## Applications of Complete Binary Trees:

Complete binary trees have various applications in data structures and algorithms:

**Heap data structure:** Heaps are often implemented using complete binary trees. In a heap, the maximum or minimum element can be efficiently extracted in O(log n) time.
**Binary heap:** A binary heap is a complete binary tree that satisfies the heap property. It is used for efficient implementation of priority queues.
**Huffman coding:** Huffman coding is a lossless data compression algorithm that uses complete binary trees to build optimal prefix codes for characters based on their frequencies.

In conclusion, a complete binary tree is a special type of binary tree where all levels except possibly the last level are completely filled, and all nodes in the last level are as far left as possible. Complete binary trees have applications in various data structures and algorithms, making them an important concept to understand in computer science and programming.

### 8 Related Question Answers Found

A complete binary tree is a special type of binary tree in data structure where all levels, except possibly the last, are completely filled, and all nodes are as far left as possible. In other words, it is a binary tree in which each level is completely filled, except for the last level which is filled from left to right. Properties of a Complete Binary Tree:
Shape Property: A complete binary tree of height h has 2h-1 nodes.

A complete binary tree is an important concept in data structures that plays a significant role in various algorithms and applications. In this article, we will explore what a complete binary tree is, its properties, and how it differs from other types of binary trees. What is a Binary Tree?

A full binary tree is a type of binary tree where every node other than the leaves has two children. In other words, each internal node in a full binary tree has exactly two child nodes. Let’s dive deeper into understanding this concept and its significance in data structures.

A full binary tree is a type of binary tree in data structure where each node has either zero or two children. In other words, every level of the tree is completely filled except possibly for the last level, which is filled from left to right. Properties of a Full Binary Tree
A full binary tree has some unique properties that distinguish it from other types of binary trees:
Every node in a full binary tree has either 0 or 2 children.

What Is Complete Binary Search Tree in Data Structure? In the field of data structures, a binary search tree (BST) is a widely used data structure that provides efficient search, insertion, and deletion operations. A binary search tree is a binary tree where each node follows a specific ordering property: the value of every node in the left subtree is less than the value of the node itself, and the value of every node in the right subtree is greater than the value of the node itself.

A binary tree is a fundamental data structure in computer science that represents a hierarchical structure with a set of connected nodes. Each node in a binary tree can have at most two children, referred to as the left child and the right child. The binary tree is called so because each node can have a maximum of two children, making it a binary branching structure.

A binary tree is a fundamental data structure in computer science and is widely used to represent hierarchical relationships between elements. It consists of nodes, where each node contains a value and has at most two children – a left child and a right child. Structure of a Binary Tree:
Each binary tree has a root node at the top, which serves as the starting point for traversing the tree.

A binary tree is a fundamental data structure in computer science that is used to represent hierarchical relationships between elements. It consists of nodes, each of which can have a maximum of two child nodes – a left child and a right child. The topmost node in the tree is called the root node.