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CSE205 Lecture 21

CSE205 Lecture 21

Object-Oriented Programming and Data Structures
Connecting the Dots
(202111)

Javier Gonzalez-Sanchez
PRO

October 01, 2021
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  1. jgs CSE 205 Object-Oriented Programming and Data Structures Lecture 21:

    Binary Tree Dr. Javier Gonzalez-Sanchez javiergs@asu.edu javiergs.engineering.asu.edu | javiergs.com PERALTA 230U Office Hours: By appointment
  2. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 2 jgs

    Quiz 05 § Open Today. § You have a week to work § A 30 minutes Quiz about data structures (including Trees)
  3. jgs Nuts and bolts of Binary Trees Nodes

  4. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 4 jgs

    What is the problem with arrays?
  5. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 5 jgs

    I introduce you a List, a Linked List
  6. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 6 jgs

    What about this?
  7. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 7 jgs

    Binary Tree § A non-linear data structure § where each node can have 2 children at most. § keep the tree sorted
  8. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 8 jgs

    Node class Node { public int value; public Node left public Node right; Node(int value){ value = value; left = null; right = null; } }
  9. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 9 jgs

    Tree | insert public class Tree { public void insert(Node node, int value) { if (value < node.value) { if (node.left != null) { insert(node.left, value); } else { System.out.println(" Inserted to left"); node.left = new Node(value); } } else if (value > node.value) { if (node.right != null) { insert(node.right, value); } else { System.out.println(" Inserted to right "); node.right = new Node(value); } } }
  10. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 10 jgs

    Tree | Example public static void main(String args[]) { Tree tree = new Tree(); Node root = new Node(5); tree.insert(root, 2); tree.insert(root, 4); tree.insert(root, 8); tree.insert(root, 6); tree.insert(root, 7); tree.insert(root, 3); tree.insert(root, 9); tree.traverseLevelOrder(); } }
  11. jgs Nuts and bolts of Binary Trees Traverse

  12. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 12 jgs

    Tree | Traverse In Order public void traverseInOrder(Node node) { if (node != null) { traverseInOrder(node.left); System.out.print(" " + node.value); traverseInOrder(node.right); } }
  13. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 13 jgs

    Tree | Traverse In Order
  14. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 14 jgs

    Tree | Traverse Pre Order public void traverseInOrder(Node node) { if (node != null) { System.out.print(" " + node.value); traverseInOrder(node.left); traverseInOrder(node.right); } }
  15. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 15 jgs

    Tree | Traverse Pre Order
  16. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 16 jgs

    Tree | Traverse Post Order public void traverseInOrder(Node node) { if (node != null) { traverseInOrder(node.left); traverseInOrder(node.right); System.out.print(" " + node.value); } }
  17. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 17 jgs

    Tree | Traverse Post Order
  18. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 30 jgs

    Questions
  19. jgs CSE 205 Object-Oriented Programming and Data Structures Javier Gonzalez-Sanchez,

    Ph.D. javiergs@asu.edu Fall 2021 Copyright. These slides can only be used as study material for the class CSE205 at Arizona State University. They cannot be distributed or used for another purpose.