C++ : Lecture 17: Deletion in Circular Linked List : Mastering Linked List Made Simple !

 Mastering Linked List Made Simple: Your Easy Guide to Data Structures !

Deletion in Circular Linked List code [C++] :

#include<iostream>

using namespace std;

class Node{

    public:

    int data;

    Node* next;

    Node(int val){

        this->data = val;

        this->next= this;

    }

};

int length(Node* head, Node* tail){

    Node* temp = head;

    int cnt = 1;

    while(temp != tail){

        temp = temp->next;

        cnt++;

    }

    return cnt;

}

void insert(Node* &head, Node* &tail, int data, int pos){

    // Step 1: Creation of new Node

    Node* newNode = new Node(data);

    // Step 2: Empty list handle

    if(head == NULL){

        head = newNode;

        tail = newNode;

        return;

    }

    // Step 3: Non-empty list handle

    // Sub-1

    if(pos == 1){

        newNode->next = head;

        tail->next = newNode;

        head =newNode;

        return;

    }

    // Sub-2

    int len = length(head, tail);

    if(pos == len+1){

        newNode->next = head;

        tail->next = newNode;

        tail =newNode;

        return;

    }

    // Sub-3

    Node* back = NULL;

    Node* front = head;

    int cnt = 1;

    while(cnt<pos){

        back = front;

        front = front->next;

        cnt++;

    }

    newNode->next = front;

    back->next = newNode;

}

void deletion(Node* &head, Node* &tail, int pos){

    // Step 1: Handle empty list case

    if(head == NULL){

        cout<<"List is empty";

        return;

    }

    // Step 2: Handle non empty list case

    // Sub-1

    if(pos == 1){

        tail->next = head->next;

        head->next = NULL;

        head = tail->next;

        return;

    }

    // Sub-2

    int len = length(head,tail);

    if(pos == len){

        Node* temp = head;

        while(temp->next != tail){

            temp =temp->next;

        }

        temp->next = head;

        tail->next = NULL;

        tail = temp;

        return;

    }

    // Sub-3

    Node* back = NULL;

    Node* front = head;

    int cnt=1;

    while(cnt<pos){

        back = front;

        front = front->next;

        cnt++;

    }

    back->next = front->next;

    front->next = NULL;

}

void print(Node* head){

    if(head == NULL){

        cout<<"List is empty";

        return;

    }

    Node* temp = head;

    cout<<temp->data<<" ";

    while(temp->next != head){

        temp = temp->next;

        cout<<temp->data<<" ";

    }

}

int main()

{

    Node* head = NULL;

    Node* tail = NULL;

    insert(head,tail,4,7);

    insert(head,tail,2,1);

    insert(head,tail,8,3);

    insert(head,tail,6,3);

    insert(head,tail,10,5);

    insert(head,tail,12,6);

    deletion(head,tail,1);

    deletion(head,tail,5);

    deletion(head,tail,3);

    print(head);

    return 0;

}

Hey, thanks for watching our video about Linked list ! In this video we’ll walk you through:

- Concept

- Deletion in circular linked list

- Steps in deletion

- Cases and subcases

- Code

All codes are available at my GitHub account, check them out here:

https://github.com/shyamkanth/Placements

Check out other videos from DS Revealed playlist: https://www.youtube.com/playlist?list=PLNXqJgOsTCZOB60T9HDhMf_o8RXbNWgqS

Check out our channel here: https://www.youtube.com/@DevelopersByte

Find us at: https://shyamkanth.github.io/

Timestamps:

0:00 Intro

00:45 Doubt solving

10:26 Deletion in CLL

10:37 Cases

14:57 Deletion from beginning

19:12 Deletion from end

23:22 Deletion from any position

28:54 Code

35:00 Output

37:10 Outro

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