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Group B:(Assignment No: 03)(SPPU Syllabus Assignment No : 20)
Problem Statement: Let x = (x1,x2, ... , xn) and y = (y1, y2,.... , ym) be two doubly linked lists. Assume that in each linked list, the nodes are in non-decreasing order of their data-field values. Write C/C++ program to merge the two lists to obtain a new linked list z in which the nodes are also in this order. Following the merge, x and y should represent empty lists because each node initially in x or y is now in z. No additional nodes may be used.
Program Code :
//============================================================================
// Name : Dll_Merge.cpp
// Author : Nitin Shivale
// Version :
// Copyright : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================
#include <iostream>
using namespace std;
// Structure to define node for dynamic mem allocation
struct node
{
int data;
node *prev,*next; // dll that's why two pointer.
};
// Structure for header node to store the metadata.
struct hnode
{
int cnt;
node *next; // next pointer to store the add of first node in list.
};
// define a class dll for various operations.
class dll
{
hnode *head; //data memebers.
node *temp,*p;
public:
dll() //Default Constructor
{
head=NULL;
temp=p=NULL;
}
//Member Functions...
hnode *create(); //returns the head node address and create DLL.
void show(hnode *); //To display DLL.
hnode *merge_dll(hnode *,hnode *);//To merge both the List in Ascending order.
};//end of class dll
hnode * dll::create()
{
int n;
cout<<"\nHow many node u want to insert in DLL: ";
cin>>n;
if(n==0)
{
head=new hnode;
head->next=NULL;
head->cnt=0;
return head;
}
while(n>0)
{
p= new node; //Allocation of memory for node
cout<<"\nEnter Data of node: ";
cin>>p->data;
p->next=NULL;//initialization of node p
p->prev=NULL;
if(head==NULL) //Check for head node if null create header node.
{
head=new hnode; //Allocate dynamic mem for head node.
head->next=p; //store the add of first node in head next.
head->cnt=1; // increment the counter of header feild.
}
else
{
temp=head->next; //temp points the first node of list
while(temp->next!=NULL)
{
temp=temp->next; //go upto the next null.
}
temp->next=p; // at the end attache the node
p->prev=temp; // previous of p is temp
head->cnt=head->cnt+1; // increment the counter.
}
n=n-1; // decrement the cnt of number of nodes.
}
return head; // The function returns the head node address.
}
void dll::show(hnode *h1)
{
temp=h1->next; //temp points to the first node of list.
cout<<"\n|cnt : "<<h1->cnt<<"|"<<h1->next<<"|-->"; //Display the containt of header node.
while(temp!=NULL)
{
//the following cout display the prev pointer value, next pointer value and data value of node.
cout<<"|"<<temp->prev<<"|Data is:"<<temp->data<<" |"<<temp->next<<"|<->"; //Display whole list information.
temp=temp->next;// To traverse to the next node.
}
cout<<"\n";
}
//To merge this both the list in ascending order.
hnode * dll::merge_dll(hnode *h1,hnode *h2)
{
node *p,*t1,*t2; //temporary pointer variables. t1 points to first list i:e h1 and t2 points to second list i:e h2.
t1=h1->next;
cout<<"\nt1 is...>"<<t1;
t2=h2->next;
cout<<"\nt2 is...>"<<t2;
hnode *h3; //creating the third header node which stores the address of merge list i:e resultant list.
h3=new hnode;
h3->cnt=0; //init of header node 3
h3->next=NULL;
if(h1->next==NULL) //check if first list is empty
{
h3->next=h2->next; //assign address of second list to h3
h3->cnt=h2->cnt; //store no of node in h2
h2->next=NULL; //make the second list i:e h2 null
return h3; //return h3 as final list
}
if(h2->next==NULL) //check if second list is empty
{
h3->next=h1->next; //assign address of first list i:e h1 to h3.
h3->cnt=h1->cnt; //also store no of nodes in h1 to h3
h1->next=NULL; //make the h1 i:e first list empty.
return h3; //return h3 as a final list.
}
if(t1->data<t2->data) //now if both are not null then check which list data is less if t1 nodes data is less than t2 node
{
h3->next=t1; //store t1 node as a first node of h3
h3->cnt=1; //make the h3 cnt one.
p=h3->next; //point temporary pointer variable p to first node of h3.
t1=t1->next; //move to the next node
}
else //if t2 node data is less than t1 node then
{
h3->next=t2; //store t2 node as a first node of h3
h3->cnt=1; //make the h3 cnt one
p=h3->next; //point temporary pointer variable p to first node of h3.
t2=t2->next;//move to the next node
}
while(t1!=NULL&&t2!=NULL) //do the following till you are not getting the both lists end is null.(both condition must be true)
{
if(t1->data<t2->data)//check if t1 data is less than t2 data if yes do the following
{
p->next=t1; //connect t1 with the previous node i:e p (p stores the address of previous node)
t1->prev=p; //connect t1 previous with p
t1=t1->next; // go to the next node for checking.
h3->cnt=h3->cnt+1; //increment the counter of h3 i:e metadata.
p=p->next; //also move the temporary pointer p to the next node after sucessful connection to acts as prevoius node for the next node to connect
}
else //check if t2 data is less than t1 data then do the following
{
p->next=t2; //connect t2 with the previous node i:e p (p stores the address of previous node)
t2->prev=p; //connect t2 previous with p
t2=t2->next; // go to the next node for checking.
h3->cnt=h3->cnt+1; //increment the counter of h3 i:e metadata.
p=p->next;//also move the temporary pointer p to the next node after sucessful connection to acts as prevoius node for the next node to connect.
}
}//end of while loop.
if(t1!=NULL)//connect all the remaining nodes of t1 to h3 till t1 is not null
{
p->next=t1;
t1->prev=p;
h3->cnt=h3->cnt+1;
}
if(t2!=NULL)//connect all the remaining nodes of t2 to h3 till t2 is not null
{
p->next=t2;
t2->prev=p;
h3->cnt=h3->cnt+1;
}
h1->next=h2->next=NULL; //make the first list(h1) and second list(h2) next NULL bcaz all the node of both list get merged with third list h3.
return h3; //return final list address h3.
}
//Program execution starts from main function.
int main()
{
dll d1,d2,d3; //objects of class dll gets created.
hnode *hd1,*hd2,*hd3; //pointer variables of hnode required to store address of lists.
hd1=hd2=NULL; //initially they are null
cout<<"\nFirst DLL :";
hd1=d1.create(); //after calling of create function, address of first list gets stored into hd1.
d1.show(hd1); //passing the address of first list hd1 to show function to display the whole list.
cout<<"\n\nSecond DLL :";
hd2=d2.create();//after calling of create function, address of second list gets stored into hd2.
d2.show(hd2);//passing the address of second list hd2 to show function to display the whole list.
cout<<"\n\nAfter Merge the DLL as Follows...\n";
hd3=d3.merge_dll(hd1,hd2); //passing the addresses of both the list to merge function to merge both list in ascending order and store merge
// address in hd3.
d3.show(hd3); //passing the address of Merge list hd3 to show function to display the whole Merge list.
return 0;
}
/**************************************ouput*****************************************
[student@localhost Documents]$ g++ dll_mrg.cpp
[student@localhost Documents]$ ./a.out
First DLL :
How many node u want to insert in DLL: 3
Enter Data of node: 5
Enter Data of node: 15
Enter Data of node: 18
|cnt : 3|0x89a010|-->|0|Data is:5 |0x89a050|<->|0x89a010|Data is:15 |0x89a070|<->|0x89a050|Data is:18 |0|<->
Second DLL :
How many node u want to insert in DLL: 3
Enter Data of node: 10
Enter Data of node: 20
Enter Data of node: 30
|cnt : 3|0x89a090|-->|0|Data is:10 |0x89a0d0|<->|0x89a090|Data is:20 |0x89a0f0|<->|0x89a0d0|Data is:30 |0|<->
After Merge the DLL as Follows...
t1 is...>0x89a010
t2 is...>0x89a090
|cnt : 6|0x89a010|-->|0|Data is:5 |0x89a090|<->|0x89a010|Data is:10 |0x89a050|<->|0x89a090|Data is:15 |0x89a070|<->|0x89a050|Data is:18 |0x89a0d0|<->|0x89a070|Data is:20 |0x89a0f0|<->|0x89a0d0|Data is:30 |0|<->
**************************************************************************************/
// Name : Dll_Merge.cpp
// Author : Nitin Shivale
// Version :
// Copyright : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================
#include <iostream>
using namespace std;
// Structure to define node for dynamic mem allocation
struct node
{
int data;
node *prev,*next; // dll that's why two pointer.
};
// Structure for header node to store the metadata.
struct hnode
{
int cnt;
node *next; // next pointer to store the add of first node in list.
};
// define a class dll for various operations.
class dll
{
hnode *head; //data memebers.
node *temp,*p;
public:
dll() //Default Constructor
{
head=NULL;
temp=p=NULL;
}
//Member Functions...
hnode *create(); //returns the head node address and create DLL.
void show(hnode *); //To display DLL.
hnode *merge_dll(hnode *,hnode *);//To merge both the List in Ascending order.
};//end of class dll
hnode * dll::create()
{
int n;
cout<<"\nHow many node u want to insert in DLL: ";
cin>>n;
if(n==0)
{
head=new hnode;
head->next=NULL;
head->cnt=0;
return head;
}
while(n>0)
{
p= new node; //Allocation of memory for node
cout<<"\nEnter Data of node: ";
cin>>p->data;
p->next=NULL;//initialization of node p
p->prev=NULL;
if(head==NULL) //Check for head node if null create header node.
{
head=new hnode; //Allocate dynamic mem for head node.
head->next=p; //store the add of first node in head next.
head->cnt=1; // increment the counter of header feild.
}
else
{
temp=head->next; //temp points the first node of list
while(temp->next!=NULL)
{
temp=temp->next; //go upto the next null.
}
temp->next=p; // at the end attache the node
p->prev=temp; // previous of p is temp
head->cnt=head->cnt+1; // increment the counter.
}
n=n-1; // decrement the cnt of number of nodes.
}
return head; // The function returns the head node address.
}
void dll::show(hnode *h1)
{
temp=h1->next; //temp points to the first node of list.
cout<<"\n|cnt : "<<h1->cnt<<"|"<<h1->next<<"|-->"; //Display the containt of header node.
while(temp!=NULL)
{
//the following cout display the prev pointer value, next pointer value and data value of node.
cout<<"|"<<temp->prev<<"|Data is:"<<temp->data<<" |"<<temp->next<<"|<->"; //Display whole list information.
temp=temp->next;// To traverse to the next node.
}
cout<<"\n";
}
//To merge this both the list in ascending order.
hnode * dll::merge_dll(hnode *h1,hnode *h2)
{
node *p,*t1,*t2; //temporary pointer variables. t1 points to first list i:e h1 and t2 points to second list i:e h2.
t1=h1->next;
cout<<"\nt1 is...>"<<t1;
t2=h2->next;
cout<<"\nt2 is...>"<<t2;
hnode *h3; //creating the third header node which stores the address of merge list i:e resultant list.
h3=new hnode;
h3->cnt=0; //init of header node 3
h3->next=NULL;
if(h1->next==NULL) //check if first list is empty
{
h3->next=h2->next; //assign address of second list to h3
h3->cnt=h2->cnt; //store no of node in h2
h2->next=NULL; //make the second list i:e h2 null
return h3; //return h3 as final list
}
if(h2->next==NULL) //check if second list is empty
{
h3->next=h1->next; //assign address of first list i:e h1 to h3.
h3->cnt=h1->cnt; //also store no of nodes in h1 to h3
h1->next=NULL; //make the h1 i:e first list empty.
return h3; //return h3 as a final list.
}
if(t1->data<t2->data) //now if both are not null then check which list data is less if t1 nodes data is less than t2 node
{
h3->next=t1; //store t1 node as a first node of h3
h3->cnt=1; //make the h3 cnt one.
p=h3->next; //point temporary pointer variable p to first node of h3.
t1=t1->next; //move to the next node
}
else //if t2 node data is less than t1 node then
{
h3->next=t2; //store t2 node as a first node of h3
h3->cnt=1; //make the h3 cnt one
p=h3->next; //point temporary pointer variable p to first node of h3.
t2=t2->next;//move to the next node
}
while(t1!=NULL&&t2!=NULL) //do the following till you are not getting the both lists end is null.(both condition must be true)
{
if(t1->data<t2->data)//check if t1 data is less than t2 data if yes do the following
{
p->next=t1; //connect t1 with the previous node i:e p (p stores the address of previous node)
t1->prev=p; //connect t1 previous with p
t1=t1->next; // go to the next node for checking.
h3->cnt=h3->cnt+1; //increment the counter of h3 i:e metadata.
p=p->next; //also move the temporary pointer p to the next node after sucessful connection to acts as prevoius node for the next node to connect
}
else //check if t2 data is less than t1 data then do the following
{
p->next=t2; //connect t2 with the previous node i:e p (p stores the address of previous node)
t2->prev=p; //connect t2 previous with p
t2=t2->next; // go to the next node for checking.
h3->cnt=h3->cnt+1; //increment the counter of h3 i:e metadata.
p=p->next;//also move the temporary pointer p to the next node after sucessful connection to acts as prevoius node for the next node to connect.
}
}//end of while loop.
if(t1!=NULL)//connect all the remaining nodes of t1 to h3 till t1 is not null
{
p->next=t1;
t1->prev=p;
h3->cnt=h3->cnt+1;
}
if(t2!=NULL)//connect all the remaining nodes of t2 to h3 till t2 is not null
{
p->next=t2;
t2->prev=p;
h3->cnt=h3->cnt+1;
}
h1->next=h2->next=NULL; //make the first list(h1) and second list(h2) next NULL bcaz all the node of both list get merged with third list h3.
return h3; //return final list address h3.
}
//Program execution starts from main function.
int main()
{
dll d1,d2,d3; //objects of class dll gets created.
hnode *hd1,*hd2,*hd3; //pointer variables of hnode required to store address of lists.
hd1=hd2=NULL; //initially they are null
cout<<"\nFirst DLL :";
hd1=d1.create(); //after calling of create function, address of first list gets stored into hd1.
d1.show(hd1); //passing the address of first list hd1 to show function to display the whole list.
cout<<"\n\nSecond DLL :";
hd2=d2.create();//after calling of create function, address of second list gets stored into hd2.
d2.show(hd2);//passing the address of second list hd2 to show function to display the whole list.
cout<<"\n\nAfter Merge the DLL as Follows...\n";
hd3=d3.merge_dll(hd1,hd2); //passing the addresses of both the list to merge function to merge both list in ascending order and store merge
// address in hd3.
d3.show(hd3); //passing the address of Merge list hd3 to show function to display the whole Merge list.
return 0;
}
/**************************************ouput*****************************************
[student@localhost Documents]$ g++ dll_mrg.cpp
[student@localhost Documents]$ ./a.out
First DLL :
How many node u want to insert in DLL: 3
Enter Data of node: 5
Enter Data of node: 15
Enter Data of node: 18
|cnt : 3|0x89a010|-->|0|Data is:5 |0x89a050|<->|0x89a010|Data is:15 |0x89a070|<->|0x89a050|Data is:18 |0|<->
Second DLL :
How many node u want to insert in DLL: 3
Enter Data of node: 10
Enter Data of node: 20
Enter Data of node: 30
|cnt : 3|0x89a090|-->|0|Data is:10 |0x89a0d0|<->|0x89a090|Data is:20 |0x89a0f0|<->|0x89a0d0|Data is:30 |0|<->
After Merge the DLL as Follows...
t1 is...>0x89a010
t2 is...>0x89a090
|cnt : 6|0x89a010|-->|0|Data is:5 |0x89a090|<->|0x89a010|Data is:10 |0x89a050|<->|0x89a090|Data is:15 |0x89a070|<->|0x89a050|Data is:18 |0x89a0d0|<->|0x89a070|Data is:20 |0x89a0f0|<->|0x89a0d0|Data is:30 |0|<->
**************************************************************************************/
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