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delete_alt.cpp
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delete_alt.cpp
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#include<iostream>
#include<cstdlib>
using namespace std;
typedef struct node
{
int data;
struct node *next;
}node;
void create(node ** head,int n)
{
node *temp;
if(*head == NULL) {
temp = (node *)malloc(sizeof(node));
temp->data = n;
*head = temp;
(*head)->next = NULL;
}else {
create((&(*head)->next),n);
}
}
void print(node *head)
{
while(head != NULL) {
cout << head->data << "-->";
head = head->next;
}
}
void delete_alt(node **head,node **prev)
{
while((*prev) != NULL && (*head) != NULL) {
(*prev)->next = (*head)->next;
free(*head);
(*prev) = (*prev)->next;
if(*prev != NULL) {
*head = (*prev)->next;
}
}
}
int main()
{
node *head = NULL;
while(1) {
//create(&head,n);
int n;
cin >> n;
if(n == 999) {
break;
}else {
create(&head,n);
}
}
print(head);
cout << endl;
node *prev = head;
node *temp = head;
head = head->next;
delete_alt(&head,&prev);
print(temp);
return 0;
}