Lecture 266:- Strict Binary Tree

In a strict binary tree, every node has either zero children (a leaf node) or exactly two children. This means that a strict binary tree cannot have nodes with just one child. Each node must either have two children or be a leaf node with no children.

In other words, a strict binary tree is a type of binary tree where every internal (non-leaf) node has exactly two children, and all leaf nodes are at the same level.

Here's an example of a strict binary tree:

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         10       /    \      5      15     / \    /  \    3   8  12  20   / \         / \  2   4       18  25

In this strict binary tree, every internal node (10, 5, 15, 3, 8, 12, and 20) has exactly two children, and all leaf nodes (2, 4, 18, and 25) are at the same level.

It's important to note that not all binary trees are strict binary trees. In a general binary tree, nodes may have zero, one, or two children. However, a strict binary tree enforces the rule that all internal nodes must have exactly two children, making it a special type of binary tree. Strict binary trees have some interesting properties and are used in certain tree-based algorithms and data structures.