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Chapter 21, Problem 18RQE
Program Plan Intro

Binary tree:

  • It is a tree data structure which comes under hierarchical data structure.
  • It is made of nodes that have a left child, right child and a data element.

Tree traversal:

  • There are 3 common methods
    • Inorder traversal
    • Preorder traversal
    • Postorder traversal
  • In inorder traversal, the left subtree is encountered first, then data node and then the right subtree.
  • In preorder traversal, the data node is encountered first, then left subtree and then the right subtree.
  • In postorder traversal, the left subtree is encountered first, then right subtree and then the data node.

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