Category Archives: Data Structure

ArrayList in Java

Posted on July 7, 2020 | Leave a comment

ArrayList in Java:

package com.zakilive;

import java.util.ArrayList;

public class Main {

    public static void main(String[] args) {
	// working with arraylist

        ArrayList words=new ArrayList<>();
        words.add("hello"); //string
        words.add("there");
        words.add(9); //integer
        words.add(12.00); //double
        words.add('H'); //character

        int item1= (int) words.get(2);
        double item2= (double) words.get(3);
        String item3= (String) words.get(0);

        System.out.println(item1+item2);


    }
}

package com.zakilive;

import java.util.ArrayList;

public class Main {

public static void main(String[] args) {

// working with arraylist

ArrayList words=new ArrayList<>();

words.add("hello"); //string

words.add("there");

words.add(9); //integer

words.add(12.00); //double

words.add('H'); //character

int item1= (int) words.get(2);

double item2= (double) words.get(3);

String item3= (String) words.get(0);

System.out.println(item1+item2);

}

Generics:

package com.zakilive;

import java.util.ArrayList;
import java.util.LinkedList;

public class Main {

    public static void main(String[] args) {
	// working with arraylist

        ArrayList<String> words=new ArrayList<String>();
        words.add("hello"); //string
        words.add("there");
        words.add("9"); //integer
//        words.add(12.00); //double
//        words.add('H'); //character

//        int item1= (int) words.get(2);
//        double item2= (double) words.get(3);
        String item3= (String) words.get(2);
        System.out.println(item3);

//        System.out.println(item1+item2);
        LinkedList<Integer> numbers=new LinkedList<Integer>();
        numbers.add(100);
        numbers.add(200);
        numbers.removeFirst();

        for(int number: numbers)
        {
            System.out.println(number);
        }

    }
}

package com.zakilive;

import java.util.ArrayList;

import java.util.LinkedList;

public class Main {

public static void main(String[] args) {

// working with arraylist

ArrayList<String> words=new ArrayList<String>();

words.add("hello"); //string

words.add("there");

words.add("9"); //integer

// words.add(12.00); //double

// words.add('H'); //character

// int item1= (int) words.get(2);

// double item2= (double) words.get(3);

String item3= (String) words.get(2);

System.out.println(item3);

// System.out.println(item1+item2);

LinkedList<Integer> numbers=new LinkedList<Integer>();

numbers.add(100);

numbers.add(200);

numbers.removeFirst();

for(int number: numbers)

{

System.out.println(number);

}

LinkedList is faster for manipulation but slower for retrieval and ArrayList is slower for manipulation but faster for retrieval

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Posted in Data Structure, Java

Algo – Linked List

Posted on June 5, 2017 | Leave a comment

Best Video Explained:

code:

some bugs here but understood the implementation:

#include<bits/stdc++.h>
void display(void);
void addatbegin(void);
void addafter(void);
struct node
{
    int data;
    struct node *link;
};

struct node *root=NULL;
int len;

void append()
{

    struct node *temp;
    temp=(struct node*)malloc(sizeof(struct node));
    printf("Enter node data: ");
    scanf("%d", &temp->data);
    temp->link=NULL;
    if(root==NULL) //list is empty
    {
        root=temp;
    }
    else
    {
        struct node* p;
        p=root;
        while(p->link!=NULL)
        {
            p=p->link;
        }
        p->link=temp;
    }
}

int length()
{
    int cnt=0;
    struct node *temp;
    temp=root;
    while(temp!=NULL)
    {
        cnt++;
        temp=temp->link;
    }
    return cnt;
}
void display()
{
    struct node* temp;
    temp==root;
    if(temp==NULL)
    {
        printf("List is empty\n");

    }
    else
    {
        while(temp!=NULL)
        {
            printf("%d-->",temp->data);
            temp=temp->link;
        }
        printf("\n");
    }
}
//void delete();

int main()
{
    int ch;
    while(1)
    {
        printf("Single linked list op:");
        printf("1. Append\n");
        printf("2. Add at begin\n");
        printf("3. Add at after\n");
        printf("4. Lenght\n");
        printf("5. Display\n");
        printf("6. Delete\n");
        printf("7. Quit\n");
        printf("enter your chocie: ");
        scanf("%d",ch);
        switch(ch)
        {
        case 1:
            append();
            break;
        case 2:
            addatbegin();
            break;
        case 3:
            addafter();
            break;
        case 4:
            len=length();
            printf("Length=%d",len);
            break;
        case 5:
            display();
            break;
        case 7:
            exit(1);
        default:
            printf("invalid\n");

        }
    }
}

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#include<bits/stdc++.h>

void display(void);

void addatbegin(void);

void addafter(void);

struct node

{

int data;

struct node *link;

};

struct node *root=NULL;

int len;

void append()

{

struct node *temp;

temp=(struct node*)malloc(sizeof(struct node));

printf("Enter node data: ");

scanf("%d", &temp->data);

temp->link=NULL;

if(root==NULL) //list is empty

{

root=temp;

}

else

{

struct node* p;

p=root;

while(p->link!=NULL)

{

p=p->link;

}

p->link=temp;

}

int length()

{

int cnt=0;

struct node *temp;

temp=root;

while(temp!=NULL)

{

cnt++;

temp=temp->link;

}

return cnt;

}

void display()

{

struct node* temp;

temp==root;

if(temp==NULL)

{

printf("List is empty\n");

}

else

{

while(temp!=NULL)

{

printf("%d-->",temp->data);

temp=temp->link;

}

printf("\n");

}

//void delete();

int main()

{

int ch;

while(1)

{

printf("Single linked list op:");

printf("1. Append\n");

printf("2. Add at begin\n");

printf("3. Add at after\n");

printf("4. Lenght\n");

printf("5. Display\n");

printf("6. Delete\n");

printf("7. Quit\n");

printf("enter your chocie: ");

scanf("%d",ch);

switch(ch)

{

case 1:

append();

break;

case 2:

addatbegin();

break;

case 3:

addafter();

break;

case 4:

len=length();

printf("Length=%d",len);

break;

case 5:

display();

break;

case 7:

exit(1);

default:

printf("invalid\n");

}

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Posted in A ll Codes, Algorithm, C, Linked List

Algo DS: Circular Queue

Posted on May 31, 2017 | Leave a comment

code:

#include<stdio.h>
#define size 4
int q[size];
int rear=-1;
int front=-1;

Enqueue(int item){
    if((rear+1)%size==front){
        printf("Queue Overflow\n");
    }else{
        if(rear==-1 && front==-1)
        {
            rear=0;
            front=0;
        }
        else{
            rear=(rear+1)%size;
        }
        q[rear]=item;
        printf("%d is inserted\n",item);
    }
}

 Dequeue(){
    int value;
    if(rear==-1 && front==-1)
    {
        printf("Queue underflow\n");
        return -1;
    }
    else{
        value=q[front];
        if(rear==front)
        {
            rear=-1;
            front=-1;
        }
        else{
            front=(front+1)%size;
        }
        return value;
    }
}

void Display()
{
    int i;
    if(rear==-1 && front==-1)
    {
        printf("Queue is empty\n");
    }
    else{
        if(front<=rear)
        {
            for(i=front;i<=rear;i++)
            {
                printf("q[%d]=%d\n",i,q[i]);
            }
        }
        else{
            for(i=front;i<size-1;i++)
            {
                printf("q[%d]=%d\n",i,q[i]);
                for(i=0;i<=rear;i++)
                {
                    printf("q[%d]=%d\n",i,q[i]);
                }
            }
        }
    }


}

int main()
{
    int cho,n;
    do{
        printf("press 1 for queue\n");
        printf("press 2 for dequeue\n");
        printf("press 3 for display\n");
        printf("press 4 for exit\n");
        printf("Enter your choice: ");
        scanf("%d",&cho);
        switch(cho)
        {
        case 1:

            printf("Enter item to insert: ");
            scanf("%d",&n);
            Enqueue(n);
            break;
        case 2:
            Dequeue();
            break;
        case 3:
            Display();
            break;
        }

    }while(cho!=4);


    return 0;
}

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#include<stdio.h>

#define size 4

int q[size];

int rear=-1;

int front=-1;

Enqueue(int item){

if((rear+1)%size==front){

printf("Queue Overflow\n");

}else{

if(rear==-1 && front==-1)

{

rear=0;

front=0;

}

else{

rear=(rear+1)%size;

}

q[rear]=item;

printf("%d is inserted\n",item);

}

Dequeue(){

int value;

if(rear==-1 && front==-1)

{

printf("Queue underflow\n");

return -1;

}

else{

value=q[front];

if(rear==front)

{

rear=-1;

front=-1;

}

else{

front=(front+1)%size;

}

return value;

}

void Display()

{

int i;

if(rear==-1 && front==-1)

{

printf("Queue is empty\n");

}

else{

if(front<=rear)

{

for(i=front;i<=rear;i++)

{

printf("q[%d]=%d\n",i,q[i]);

}

else{

for(i=front;i<size-1;i++)

{

printf("q[%d]=%d\n",i,q[i]);

for(i=0;i<=rear;i++)

{

printf("q[%d]=%d\n",i,q[i]);

}

int main()

{

int cho,n;

do{

printf("press 1 for queue\n");

printf("press 2 for dequeue\n");

printf("press 3 for display\n");

printf("press 4 for exit\n");

printf("Enter your choice: ");

scanf("%d",&cho);

switch(cho)

{

case 1:

printf("Enter item to insert: ");

scanf("%d",&n);

Enqueue(n);

break;

case 2:

Dequeue();

break;

case 3:

Display();

break;

}

}while(cho!=4);

return 0;

}

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Posted in A ll Codes, Algorithm, C, C Refresh, Circular Queue

Data Structure: Queue

Posted on May 26, 2017 | Leave a comment

Stack VS Queue difference:
https://www.youtube.com/watch?v=XuCbpw6Bj1U

code:

/*
 * C Program to Implement a Queue using an Array
 */

#include <stdio.h>
#include <conio.h>
#define N 10

int queue[N];
int rear = - 1;
int front = - 1;
main()
{
    int choice;
    while (1)
    {
        printf("1.Insert element to queue \n");
        printf("2.Delete element from queue \n");
        printf("3.Display all elements of queue \n");
        printf("4.Quit \n");
        printf("Enter your choice : ");
        scanf("%d", &choice);
        switch (choice)
        {
            case 1:insert();
            	   break;

            case 2:delete();
                   break;

            case 3:display();
                   break;

            case 4:exit(1);
            
            default:printf("Wrong choice \n");
            
        } /*End of switch*/
    } /*End of while*/
} /*End of main()*/


insert()
{
    int element;

    if (rear == N - 1)
    printf("Queue Overflow \n");

    else
    {
        if (front == - 1)
        /*If queue is initially empty */
        front = 0;
        
        printf("Inset the element in queue : ");
        scanf("%d", &element);
        rear = rear + 1;
        queue[rear] = element;
    }
} 
 

delete()
{
    if (front == - 1 || front > rear)
    {
        printf("Queue Underflow \n");
        return ;
    }

    else
    {
        printf("Element deleted from queue is : %d\n", queue[front]);
        front = front + 1;
    }
} 


display()
{
    int i;

    if (front == - 1)
        printf("Queue is empty \n");

    else
    {
        printf("Queue is : \n");
        for (i = front; i <= rear; i++)
            printf("%d ", queue[i]);
        printf("\n");
    }
} 


Output:-

1.Insert element to queue
2.Delete element from queue
3.Display all elements of queue
4.Quit

Enter your choice : 1
Inset the element in queue : 10

1.Insert element to queue
2.Delete element from queue
3.Display all elements of queue
4.Quit

Enter your choice : 1
Inset the element in queue : 50

1.Insert element to queue
2.Delete element from queue
3.Display all elements of queue
4.Quit

Enter your choice : 1
Inset the element in queue : 30

1.Insert element to queue
2.Delete element from queue
3.Display all elements of queue
4.Quit

Enter your choice : 1
Inset the element in queue : 60

1.Insert element to queue
2.Delete element from queue
3.Display all elements of queue
4.Quit

Enter your choice : 2
Element deleted from queue is : 10

1.Insert element to queue
2.Delete element from queue
3.Display all elements of queue
4.Quit

Enter your choice : 3
Queue is :
50 30 60

1.Insert element to queue
2.Delete element from queue
3.Display all elements of queue
4.Quit

Enter your choice : 4

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* C Program to Implement a Queue using an Array

#include <stdio.h>

#include <conio.h>

#define N 10

int queue[N];

int rear = - 1;

int front = - 1;

main()

{

int choice;

while (1)

{

printf("1.Insert element to queue \n");

printf("2.Delete element from queue \n");

printf("3.Display all elements of queue \n");

printf("4.Quit \n");

printf("Enter your choice : ");

scanf("%d", &choice);

switch (choice)

{

case 1:insert();

break;

case 2:delete();

break;

case 3:display();

break;

case 4:exit(1);

default:printf("Wrong choice \n");

} /*End of switch*/

} /*End of while*/

} /*End of main()*/

insert()

{

int element;

if (rear == N - 1)

printf("Queue Overflow \n");

else

{

if (front == - 1)

/*If queue is initially empty */

front = 0;

printf("Inset the element in queue : ");

scanf("%d", &element);

rear = rear + 1;

queue[rear] = element;

}

delete()

{

if (front == - 1 || front > rear)

{

printf("Queue Underflow \n");

return ;

}

else

{

printf("Element deleted from queue is : %d\n", queue[front]);

front = front + 1;

}

display()

{

int i;

if (front == - 1)

printf("Queue is empty \n");

else

{

printf("Queue is : \n");

for (i = front; i <= rear; i++)

printf("%d ", queue[i]);

printf("\n");

}

Output:-

1.Insert element to queue

2.Delete element from queue

3.Display all elements of queue

4.Quit

Enter your choice : 1

Inset the element in queue : 10

1.Insert element to queue

2.Delete element from queue

3.Display all elements of queue

4.Quit

Enter your choice : 1

Inset the element in queue : 50

1.Insert element to queue

2.Delete element from queue

3.Display all elements of queue

4.Quit

Enter your choice : 1

Inset the element in queue : 30

1.Insert element to queue

2.Delete element from queue

3.Display all elements of queue

4.Quit

Enter your choice : 1

Inset the element in queue : 60

1.Insert element to queue

2.Delete element from queue

3.Display all elements of queue

4.Quit

Enter your choice : 2

Element deleted from queue is : 10

1.Insert element to queue

2.Delete element from queue

3.Display all elements of queue

4.Quit

Enter your choice : 3

Queue is :

50 30 60

1.Insert element to queue

2.Delete element from queue

3.Display all elements of queue

4.Quit

Enter your choice : 4

My implementation:

#include<stdio.h>
#include<stdlib.h>
#define MAX 10
int q[MAX];
int front=-1;
int rear=-1;
void Insert()
{
    int element;
    if(rear==MAX-1)
        printf("\nQueue Overflow\n");
    else
    {
        if(front==-1)
            front=0;
        printf("Insert the element in queue: ");
        scanf("%d",&element);
        rear=rear+1;
        q[rear]=element;
    }
}

void Delete()
{
    if(front==-1||front>rear)
    {
        printf("\nQueue Underflow\n");
        return;
    }
    else
    {
        printf("\nElement deleted from queue is: %d\n",q[front]);
        front=front+1;
    }
}
void Display()
{
    int i;
    if(front==-1)
        printf("\nQueue is empty\n");
    else
    {
        printf("\nQueue is: ");
        for(i=front; i<=rear; i++)
            printf("%d ",q[i]);
        printf("\n");
    }

}

int main()
{


    int choice;
    while(1)
    {

        printf("1. Insert element to queue\n");
        printf("2. Delete elements\n");
        printf("3. Display all elements\n");
        printf("4. Quit\n");
        printf("Enter your choice: ");
        scanf("%d",&choice);
        switch(choice)
        {
        case 1:
            Insert();
            break;
        case 2:
            Delete();
            break;
        case 3:
            Display();
            break;
        case 4:
            exit(1);
        default:
            printf("Wrong Choice\n");

        }
    }


    return 0;
}

#include<stdio.h>

#include<stdlib.h>

#define MAX 10

int q[MAX];

int front=-1;

int rear=-1;

void Insert()

{

int element;

if(rear==MAX-1)

printf("\nQueue Overflow\n");

else

{

if(front==-1)

front=0;

printf("Insert the element in queue: ");

scanf("%d",&element);

rear=rear+1;

q[rear]=element;

}

void Delete()

{

if(front==-1||front>rear)

{

printf("\nQueue Underflow\n");

return;

}

else

{

printf("\nElement deleted from queue is: %d\n",q[front]);

front=front+1;

}

void Display()

{

int i;

if(front==-1)

printf("\nQueue is empty\n");

else

{

printf("\nQueue is: ");

for(i=front; i<=rear; i++)

printf("%d ",q[i]);

printf("\n");

}

int main()

{

int choice;

while(1)

{

printf("1. Insert element to queue\n");

printf("2. Delete elements\n");

printf("3. Display all elements\n");

printf("4. Quit\n");

printf("Enter your choice: ");

scanf("%d",&choice);

switch(choice)

{

case 1:

Insert();

break;

case 2:

Delete();

break;

case 3:

Display();

break;

case 4:

exit(1);

default:

printf("Wrong Choice\n");

}

return 0;

}

Another Video:

https://www.youtube.com/watch?v=okr-XE8yTO8

Code from the video Mycodeschool(Using circular queue):

#include<stdio.h>
using namespace std;
#define MAX_SIZE 101
int A[MAX_SIZE];
int fronta,rear;

bool IsEmpty()
{
    return(fronta==-1 && rear==-1);
}

bool IsFull()
{
   // if(rear==MAX_SIZE-1)
    if((rear+1)%MAX_SIZE==fronta)
        return true;
    else
        return false;
}
void Enqeue(int x)
{
    printf("Enqueuing: %d",x);
    if(IsFull()){
        printf("Error: Queue is full\n");
        return;
    }
    else if(IsEmpty())
    {
        fronta=rear=0;
    }
    else
    {
        rear=(rear+1)%MAX_SIZE;
    }
    A[rear]=x;
}

void Dequeue()
{
    printf("Dequeuing:  ");
    if(IsEmpty())
        return;
    else if(fronta==rear)
        fronta=rear=1;
    else
        fronta=(fronta+1)%MAX_SIZE;
}

int Froonta()
{
    if(fronta==-1)
    {
        printf("Can't return from an empty queue\n");
        return -1;
    }
    return A[fronta];
}

void print()
{
    int counta=(rear+MAX_SIZE-fronta)%MAX_SIZE+1;
    printf(" Queue:  ");
    int i;
    for(i=0; i<counta; i++)
    {
        int index=(fronta+i)%MAX_SIZE;
        printf("%d ",A[index]);  //Index of element while traaversing circulrly from front
    }
    printf("\n");
}

int main()
{
    Enqeue(2);
    print();
    Enqeue(4);
    print();
    Enqeue(6);
    print();
    Enqeue(8);
    print();
    Dequeue();
    print();
    Enqeue(8);
    print();
    return 0;
}

#include<stdio.h>

using namespace std;

#define MAX_SIZE 101

int A[MAX_SIZE];

int fronta,rear;

bool IsEmpty()

{

return(fronta==-1 && rear==-1);

}

bool IsFull()

{

// if(rear==MAX_SIZE-1)

if((rear+1)%MAX_SIZE==fronta)

return true;

else

return false;

}

void Enqeue(int x)

{

printf("Enqueuing: %d",x);

if(IsFull()){

printf("Error: Queue is full\n");

return;

}

else if(IsEmpty())

{

fronta=rear=0;

}

else

{

rear=(rear+1)%MAX_SIZE;

}

A[rear]=x;

}

void Dequeue()

{

printf("Dequeuing: ");

if(IsEmpty())

return;

else if(fronta==rear)

fronta=rear=1;

else

fronta=(fronta+1)%MAX_SIZE;

}

int Froonta()

{

if(fronta==-1)

{

printf("Can't return from an empty queue\n");

return -1;

}

return A[fronta];

}

void print()

{

int counta=(rear+MAX_SIZE-fronta)%MAX_SIZE+1;

printf(" Queue: ");

int i;

for(i=0; i<counta; i++)

{

int index=(fronta+i)%MAX_SIZE;

printf("%d ",A[index]); //Index of element while traaversing circulrly from front

}

printf("\n");

}

int main()

{

Enqeue(2);

print();

Enqeue(4);

print();

Enqeue(6);

print();

Enqeue(8);

print();

Dequeue();

print();

Enqeue(8);

print();

return 0;

}

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Posted in A ll Codes, Algorithm, C, C Refresh, Queue

Tagged queue

Stack

Posted on March 17, 2017 | Leave a comment

Vid:
https://www.youtube.com/watch?v=sFVxsglODoo
Code:
Array Implementation:

#include<iostream>
using namespace std;
#define MAX_SIZE 101
int A[MAX_SIZE];
int top=-1; //top==index of array
void push(int x){
//top++;
//A[top]=x;
if(top==MAX_SIZE-1){
    cout<<"Stack Overflow";
    return;
}
A[++top]=x; //here pre increment operator is using
}
void pop()
{
    if(top==-1){
        cout<<"No element to return";
        return;
    }
    top--;
}
int Top()
{
    return A[top];
}
void print()
{
    cout<<"Stack:";
    for(int i=0; i<=top; i++){
    cout<<" "<<A[i]<<" ";
    }
 cout<<endl;

}
int main()
{
push(2);print();
push(1);print();
push(7);print();
pop();print();
pop();print();
push(10);print();
}

#include<iostream>

using namespace std;

#define MAX_SIZE 101

int A[MAX_SIZE];

int top=-1; //top==index of array

void push(int x){

//top++;

//A[top]=x;

if(top==MAX_SIZE-1){

cout<<"Stack Overflow";

return;

}

A[++top]=x; //here pre increment operator is using

}

void pop()

{

if(top==-1){

cout<<"No element to return";

return;

}

top--;

}

int Top()

{

return A[top];

}

void print()

{

cout<<"Stack:";

for(int i=0; i<=top; i++){

cout<<" "<<A[i]<<" ";

}

cout<<endl;

}

int main()

{

push(2);print();

push(1);print();

push(7);print();

pop();print();

push(10);print();

}

OOP Implementation with Array:

#include<iostream>
using namespace std;
#define MAX_SIZE 101
class Stack{
private:
int A[MAX_SIZE];
int top; //top==index of array
public:
    Stack(){
        top=-1;
    }
    void push(int x)
    {
        if(top==MAX_SIZE-1){
            cout<<"err: stackoverflow";
            return;
        }
        A[++top]=x;
    }
    void pop()
    {
        if(top==-1)
        {
            cout<<"No element to pop";
            return;
        }
        top--;
    }
    int Top(){
        return A[top];
    }
    int IsEmpty(){
        if(top==-1)
            return 1;
        return 0;
    }
    void print(){
        int i;
        cout<<"Stack: ";
        for(i=0;i<=top;i++){
            cout<<A[i]<<" ";
        }
        cout<<endl;
    }
};

int main(){
    Stack S;
    S.push(2);S.print();
    S.push(5);S.print();
    S.push(10);S.print();
    S.pop();S.print();
    S.pop();S.print();
    S.push(18);S.print();
}

#include<iostream>

using namespace std;

#define MAX_SIZE 101

class Stack{

private:

int A[MAX_SIZE];

int top; //top==index of array

public:

Stack(){

top=-1;

}

void push(int x)

{

if(top==MAX_SIZE-1){

cout<<"err: stackoverflow";

return;

}

A[++top]=x;

}

void pop()

{

if(top==-1)

{

cout<<"No element to pop";

return;

}

top--;

}

int Top(){

return A[top];

}

int IsEmpty(){

if(top==-1)

return 1;

return 0;

}

void print(){

int i;

cout<<"Stack: ";

for(i=0;i<=top;i++){

cout<<A[i]<<" ";

}

cout<<endl;

}

};

int main(){

Stack S;

S.push(2);S.print();

S.push(5);S.print();

S.push(10);S.print();

S.pop();S.print();

S.push(18);S.print();

}

Practice Problem:
http://www.mycodeschool.com/problems/stock-market

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Posted in A ll Codes, Data Structure, Stack

Tagged stack

DS Journery of my Alone

Posted on March 11, 2017 | Leave a comment

We learn data structure to organize data to manipulate data.

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Posted in Algorithm, Data Structure

Some Data Structure Basics To Know

Posted on December 31, 2015 | Leave a comment

https://www.youtube.com/watch?v=HdFG8L1sajw&list=PL2_aWCzGMAwI3W_JlcBbtYTwiQSsOTa6P&index=2

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