Binary tree traversal is a fundamental concept in data structures. It involves visiting all the nodes in a binary tree in a specific order. There are three common types of binary tree traversal: in-order, pre-order, and post-order.

In-Order Traversal

In in-order traversal, the nodes are visited in the following order: left subtree, root, right subtree.

  • Visit the left subtree.
  • Visit the root.
  • Visit the right subtree.

Pre-Order Traversal

In pre-order traversal, the nodes are visited in the following order: root, left subtree, right subtree.

  • Visit the root.
  • Visit the left subtree.
  • Visit the right subtree.

Post-Order Traversal

In post-order traversal, the nodes are visited in the following order: left subtree, right subtree, root.

  • Visit the left subtree.
  • Visit the right subtree.
  • Visit the root.

Example

Here is an example of a binary tree:

    1
   / \
  2   3
 / \
4   5
  • In-order traversal: 4, 2, 5, 1, 3
  • Pre-order traversal: 1, 2, 4, 5, 3
  • Post-order traversal: 4, 5, 2, 3, 1

Binary Tree Example

For more information on binary tree traversal, you can read our detailed guide on Binary Tree Traversal Algorithms.

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