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  // Online C++ compiler to run C++ program online


#include <iostream>


using namespace std;




struct node{


    public:


    int data;


    node* next;


    


    node(int data){


        this->data=data;


        next=NULL;


    }


};




void display(node* head){


    node* temp=head;


    while(temp!=NULL){


        cout<<temp->data<<"->";


        temp=temp->next;


    }

    cout<<"NULL"<<endl;


    


    


    


}




node* input_optimal(){


    int data;


    cin>>data;


    node* head=NULL;


    node*tail=NULL;


    while(data!=-1){


        node*n=new node(data);


        if (head==NULL){


        head=n;


        tail=n;


        }


        else{


            tail->next=n;


            //tail=tail->next;


            //OR


            tail=n;


            


        }


        cin>>data;


    }


    return head;


}


node* insert_node(node*head,int i, int data){

    node*temp=head;

    node*n=new node(data);

    int count=0;

    if (i==0){

        n->next=head;

        head=n;

        return head;

        

    }

    else{

    while(count<i-1 && temp!=NULL){

        temp=temp->next;

        count++;

    }

    if (temp!=NULL){

    n->next=temp->next;

    temp->next=n;

    }

    }

    return head;

    

    

    

    

}


node* del(node*head, int i){

    node*temp=head;

    int count=0;

    if(i==0){

        head=head->next;

        return head;

    }

    else{

    while(temp!=NULL &&count<i-1){

        temp=temp->next;

        count++;

    }

    if (temp!=NULL){

        temp->next=temp->next->next;

    }

    return head;

    }

    

}


int main() {


    node*head=input_optimal();

    display(head);

    head=insert_node(head,1,99);

    display(head);

    head=del(head,0);

    display(head);

    


    


    


    


    




    return 0;


}

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