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/******************************************************************************

Singly linked list

1. insert node begin, end, after an element, at kth position

2 Delete a node begin, end.

*******************************************************************************/

#include <iostream>

using namespace std;

class Node

{

public:

int data;

Node *next;

};

Node *head = NULL;

Node* Reverse()

{

Node *current, *prev=NULL , *next;

if(head == NULL) return NULL;

while(current != NULL)

{

next = current->next;

current->next = prev;

prev = current;

current = next;

}

head = prev;

return head;

}

Node* pre= NULL;

Node* reverse_recusrion(Node* head){

//Node* newNode;

if(head == NULL){

//newNode = pre;

return pre;

}

Node* temp = head->next;

head->next = pre;

pre = head;

return reverse_recusrion(temp);

}

Node* addtoEmpty(Node *list, int x)

{

Node *tmp = new Node;

tmp->data = x;

list = tmp;

list->next = NULL;

return list;

}

void InsertNode(int x)

{

Node* tmp = new Node();

tmp->data = x;

tmp->next = head;

head = tmp;

}

void InsertEnd(int x)

{

Node* tmp = new Node();

tmp->data = x;

tmp->next = NULL;

Node* tmp1 = head;

while(tmp1->next != NULL)

{

tmp1 = tmp1->next;

}

tmp1->next = tmp;

}

Node* insertNodeEnd(Node* head, int x)

{

Node *tmp = new Node();

tmp->data = x;

tmp->next = NULL;

if(head == NULL)

{

head = tmp;

return head;

}

Node* tmp1 = head;

while(tmp1->next != NULL)

{

tmp1 = tmp1->next;

}

tmp1->next = tmp;

return head;

}

Node* insertNodeStart(Node* head, int x)

{

Node *tmp = new Node();

tmp->data = x;

tmp->next = NULL;

if(head == NULL)

{

head = tmp;

return head;

}

tmp->next = head;

head = tmp;

return head;

}

Node* insertNodeafter(Node* head, int pos, int x)

{

if(head == NULL)

{

return head;

}

Node* tmp, *p = head;

do {

if(p->data == pos)

{

cout << "pos found" << endl;

tmp = new Node();

tmp->data = x;

tmp->next = p->next;

p->next = tmp;

return head;

}

p = p->next;

}while(p != NULL);

return head;

}

Node* insertNodekthpos(Node* head, int pos, int x)

{

Node *temp1 = new Node();

temp1->data = x;

temp1->next = NULL;

//insert first

if(pos == 1)

{

temp1->next = head;

head = temp1;

return head;

}

Node* temp2 = head;

for(int i = 0; i < pos-2; i++)

{

temp2 = temp2->next;

}

temp1->next = temp2->next;

temp2->next = temp1;

return head;

}

Node* deleteatpos(Node* head, int pos)

{

if(head == NULL) {

cout << "list is empty" << endl;

return head;

}

if(pos == 1)

{

Node* tmp = head;

head = tmp->next;

delete tmp;

return head;

}

Node* tmp1 = head;

for(int i = 0; i < pos-2; i++)

{

tmp1 = tmp1->next;

}

Node *tmp2 = tmp1->next;

tmp1->next = tmp2->next;

delete tmp2;

return head;

}

Node* deleteHead(Node* head)

{

if(head == NULL)

{

cout << "head is null " << endl;

return head;

}

Node* tmp = head;

delete tmp;

head = head->next;

return head;

}

Node* deleteTail(Node* head)

{

if(head == NULL)

{

cout << "head is null " << endl;

return head;

}

if(head -> next == NULL)

{

delete head;

head = NULL;

}

else

{

Node* ptr = head;

Node* ptr1;

while(ptr->next != NULL)

{

ptr1 = ptr;

ptr = ptr->next;

}

ptr1->next = NULL;

delete ptr;

return head;

}

}

void printlist(Node* list)

{

if(list == NULL ) {

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

}

Node* p = list;

while(p != NULL)

{

cout << p->data << " ";

p = p->next;

}

cout << endl;

}

void print_recursion(Node* node)

{

if(node == NULL )

{

cout << endl;

return;

}

cout << node->data << " ";

print_recursion(node->next);

}

void print_reverse(Node* node)

{

if(node == NULL )

{

return;

}

print_reverse(node->next);

cout << node->data << " ";

}

int main()

{

/*

InsertNode(10);

InsertNode(20);

InsertNode(30);

InsertNode(40);

InsertNode(50);

InsertEnd(5);

*/

Node *head1 = NULL;

head1 = insertNodeEnd(head1, 5);

head1 = insertNodeEnd(head1, 10);

head1 = insertNodeEnd(head1, 20);

head1 = insertNodeEnd(head1, 30);

head1 = insertNodeEnd(head1, 40);

head1 = insertNodeStart(head1, 4);

head1 = insertNodeStart(head1, 3 );

head1 = insertNodeafter(head1, 30, 35);

head1 = insertNodeafter(head1, 30, 33);

head1 = insertNodekthpos(head1, 1, 2);

printlist(head1);

head1 = insertNodekthpos(head1, 7, 25);

printlist(head1);

head1 = deleteHead(head1);

printlist(head1);

head1 = deleteHead(head1);

printlist(head1);

head1 = deleteHead(head1);

printlist(head1);

head1 = deleteTail(head1);

printlist(head1);

head1 = deleteatpos(head1, 4); //delete 4th node - 25*/

printlist(head1);

print_recursion(head1);

print_reverse(head1);

cout << endl;

head1 = reverse_recusrion(head1);

printlist(head1);

return 0;

}