Skip to main content

Java Program To Implement Red Black Tree Operations.

import java.util.Scanner;
public class RedBlackTreeA {
public static void main(String[] args) {

Scanner scan = new Scanner(System.in);
RBTree rbt = new RBTree(Integer.MIN_VALUE);
char ch;

do {       // Deletion of Nodes is not implemented.
System.out.println("Red Black Tree Operations:");
System.out.println("1. Insert ");
System.out.println("2. Search");
System.out.println("3. Count Nodes");
System.out.println("4. Check Empty");
System.out.println("5. Clear Tree\n");
System.out.print("Enter Your Choice: ");

int choice = scan.nextInt();
switch (choice) {

case 1 :
System.out.print("Enter An Integer To Insert: ");
rbt.insert( scan.nextInt() );
break;

case 2 :
System.out.print("Enter An Integer To Search: ");
System.out.println("Search Result : "+ rbt.search( scan.nextInt() ));
break;

case 3 :
System.out.println("Nodes = "+ rbt.countNodes());
break;

case 4 :
System.out.println("Empty Status = "+ rbt.isEmpty());
break;

case 5 :
System.out.println("Tree Cleared");
rbt.makeEmpty();
break;

default :
System.out.print("Wrong Entry \n ");
break;
}

System.out.print("\nPost Order : ");
rbt.postorder();
System.out.print("\nPre Order : ");
rbt.preorder();
System.out.print("\nIn Order : ");
rbt.inorder();

System.out.println("\n\nDo You Want To Continue (Type Y OR N): ");
ch = scan.next().charAt(0);
} while (ch == 'Y'|| ch == 'y');

scan.close();
}}

RedBlackNode.java:
class RedBlackNode {
RedBlackNode left, right;
int element;
int color;

public RedBlackNode(int theElement){
this( theElement, null, null );
}

public RedBlackNode(int theElement, RedBlackNode lt, RedBlackNode rt){
left = lt;
right = rt;
element = theElement;
color = 1;
}}

class RBTree {
private RedBlackNode current;
private RedBlackNode parent;
private RedBlackNode grand;
private RedBlackNode great;
private RedBlackNode header;
private static RedBlackNode nullNode;

static {
nullNode = new RedBlackNode(0);
nullNode.left = nullNode;
nullNode.right = nullNode;
}

static final int BLACK = 1;
static final int RED   = 0;

public RBTree(int negInf) {
header = new RedBlackNode(negInf);
header.left = nullNode;
header.right = nullNode;
}

public boolean isEmpty() {
return header.right == nullNode;
}

public void makeEmpty() {
header.right = nullNode;
}

public void insert(int item ) {
current = parent = grand = header;
nullNode.element = item;

while (current.element != item) {
great = grand;
grand = parent;
parent = current;

current = item < current.element ? current.left : current.right;
if (current.left.color == RED && current.right.color == RED)
handleReorient( item );
}

if (current != nullNode)
return;
current = new RedBlackNode(item, nullNode, nullNode);

if (item < parent.element)
parent.left = current;

else
parent.right = current;
handleReorient( item );
}

private void handleReorient(int item) {
current.color = RED;
current.left.color = BLACK;
current.right.color = BLACK;

if (parent.color == RED) {
grand.color = RED;

if (item < grand.element != item < parent.element)
parent = rotate( item, grand );  // Start dbl rotate
current = rotate(item, great );
current.color = BLACK;
}

header.right.color = BLACK;
}

private RedBlackNode rotate(int item, RedBlackNode parent){

if(item < parent.element)
return parent.left = item < parent.left.element ? rotateWithLeftChild(parent.left) : rotateWithRightChild(parent.left) ; 

else
return parent.right = item < parent.right.element ? rotateWithLeftChild(parent.right) : rotateWithRightChild(parent.right); 
}

private RedBlackNode rotateWithLeftChild(RedBlackNode k2){
RedBlackNode k1 = k2.left;
k2.left = k1.right;
k1.right = k2;
return k1;
}

private RedBlackNode rotateWithRightChild(RedBlackNode k1){
RedBlackNode k2 = k1.right;
k1.right = k2.left;
k2.left = k1;
return k2;
}

public int countNodes() {
return countNodes(header.right);
}

private int countNodes(RedBlackNode r) {
if (r == nullNode)
return 0;

else {
int l = 1;
l += countNodes(r.left);
l += countNodes(r.right);
return l;
}}

public boolean search(int val) {
return search(header.right, val);
}

private boolean search(RedBlackNode r, int val) {
boolean found = false;

while ((r != nullNode) && !found) {
int rval = r.element;

if (val < rval)
r = r.left;

else if (val > rval)
r = r.right;

else {
found = true;
break;
}

found = search(r, val);
}
return found;
}

public void inorder() {
inorder(header.right);
}

private void inorder(RedBlackNode r) {

if (r != nullNode) {
inorder(r.left);
char c = 'B';

if (r.color == 0)
c = 'R';

System.out.print(r.element +""+c+" ");
inorder(r.right);
}}

public void preorder() {
preorder(header.right);
}

private void preorder(RedBlackNode r) {
if (r != nullNode) {
char c = 'B';

if (r.color == 0)
c = 'R';

System.out.print(r.element +""+c+" ");
preorder(r.left);
preorder(r.right);
}}

public void postorder(){
postorder(header.right);
}

private void postorder(RedBlackNode r) {

if (r != nullNode) {
postorder(r.left);
postorder(r.right);
char c = 'B';

if (r.color == 0)
c = 'R';

System.out.print(r.element +""+c+" ");
}}}
Labels:

Popular posts from this blog

Screenshots from Windows 1.01

Windows 1.0 is a graphical personal computer operating environment developed by Microsoft, released on November 20, 1985, as the first version of the Microsoft Windows line. Version 1.01 , also released in 1985, was the first point-release after Windows 1.00.   Screenshots from Windows 1.01: ⇰ Desktop  First Run Empty Desktop Desktop With Applications ⇰  Office Applications Notepad Text Editor Calculator Calendar Clock Address Book ⇰  Multimedia Applications Media player, CD player, Volume level, and Sound: This GUI doesn’t have these features. ⇰  Networking Applications Terminal Phone Dialer: This GUI doesn’t have this feature. ⇰  Internet Applications Browser, and Mail: This GUI doesn’t have these features. ⇰  Accessibility Applications Keyboard Map:  This GUI doesn’t have this feature. ⇰  Settings Desktop themes,  Display,  S...
Read more

Introduction To Algorithms, 3rd Edition

Before there were computers, there were algorithms. But now that there are computers, there are even more algorithms, and algorithms lie at the heart of computing. This book provides a comprehensive introduction to the modern study of computer algorithms. It presents many algorithms and covers them in considerable depth, yet makes their design and analysis accessible to all levels of readers. In this book, the authors tried to keep explanations elementary without sacrificing depth of coverage or mathematical rigor. Each chapter presents an algorithm, a design technique, an application area, or a related topic. Algorithms are described in English and in a pseudocode designed to be readable by anyone who has done a little programming. The book contains 244 figures — many with multiple parts — illustrating how the algorithms work. It also includes careful analysis of the running times of all algorithms. In this third edition, the entire book once again updated including changes cove...
Read more

C++ Program To Implement Casino Number Guessing Game.

#include <iostream> #include <string> #include <cstdlib> #include <ctime> using namespace std; void drawLine(int n, char symbol); void rules(); int main() { string playerName; int amount; int bettingAmount; int guess; int dice; char choice; srand(time(0)); drawLine(70,'_'); cout << "\n\n\n\t\tCASINO GAME\n\n\n\n"; drawLine(70,'_'); cout << "\n\nEnter Your Name : "; getline(cin, playerName); cout << "\n\nEnter Deposit Amount To Play Game : $"; cin >> amount;
Read more

Java: The Complete Reference, 9th Edition

This is Herb's most popular book on Java, fully updated and expanded to cover Java SE 8 (JDK 8).    Whether you're an experienced pro or just starting out, this one-stop guide will help you master this important language.  Inside you'll find comprehensive coverage of the Java language, its keywords, syntax, and fundamental programming principles.  Of course, descriptions of Java's newest features, such as lambda expressions, default interface methods, and the stream API are included. This lasting resource also describes key elements of the Java API library, such as the Collections Framework, concurrency, applets, servlets, Beans, event handling,  AWT,  Swing, and more. Coverage of JavaFX, Java's newest GUI framework, is also included. *** TO REVIEW BOOK ***  (click below) *** TO REVIEW SOURCE CODE PROBLEM  SOLUTIONS, VISIT   THIS   LINK ***
Read more