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delete_node_LL.cpp
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delete_node_LL.cpp
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#include <iostream>
using namespace std;
class Node
{
public:
int data;
Node* next;
Node(int data)
{
this->data = data;
next = NULL;
}
};
Node *take_input()
{
int data;
cout << "Enter the data: " << endl;
cin >> data;
Node* head = NULL;
Node* tail = NULL;
while(data!=-1) // whenever we enter -1 LL ends
{
Node* newNode = new Node(data);
if(head==NULL)
{
head = newNode;
tail = newNode;
}
else
{
tail->next = newNode;
tail = newNode;
}
cin >> data;
}
return head;
}
void *print_LL(Node* head)
{
Node* temp = head;
while(temp!=NULL)
{
cout << temp->data << " ";
temp = temp->next;
}
}
Node* delete_node(Node* head, int i)
{
int count = 0;
Node* temp = head;
if(head==NULL || head->next==NULL ) //case with sinngle or no element
{
return head;
}
if(i==0)
{
Node* temp1 = head;
head = head->next;
delete temp1;
return head;
}
while(temp!=NULL && count<i-1)
{
temp = temp->next;
count++;
}
if(temp!=NULL)
{
Node *a = temp->next;
temp->next = a->next;
delete a;
}
return head;
}
int main()
{
Node* head = take_input();
cout << "The LL is: " << endl;
print_LL(head);
cout << endl;
int i;
cout << "Enter the index whose data u want to delete: " << endl;
cin >> i;
head = delete_node(head, i);
cout << "LL After Deletion : " << endl;
print_LL(head);
}