# Create new linked list from two given linked list with greater element at each node in C++ Program

In this tutorial, we are going to write a program that creates a new linked list from the given linked lists.

We have given two linked lists of the same size and we have to create a new linked list from the two linked lists with the max numbers from the two linked lists.

Let's see the steps to solve the problem.

• Write a struct node.

• Create two linked lists of the same size.

• Iterate over the linked list.

• Find the max number from the two linked lists nodes.

• Create a new node with the max number.

• Add the new node to the new linked list.

• Print the new linked list.

## Example

Let's see the code.

Live Demo

#include <bits/stdc++.h>
using namespace std;
struct Node {
int data;
Node* next;
};
void insertNewNode(Node** root, int data) {
Node *ptr, *temp;
temp = new Node;
temp->data = data;
temp->next = NULL;
if (*root == NULL) {
*root = temp;
}
else {
ptr = *root;
while (ptr->next != NULL) {
ptr = ptr->next;
}
ptr->next = temp;
}
}
Node* getNewLinkedList(Node* root1, Node* root2) {
Node *ptr1 = root1, *ptr2 = root2, *ptr;
Node *root = NULL, *temp;
while (ptr1 != NULL) {
temp = new Node;
temp->next = NULL;
if (ptr1->data < ptr2->data) {
temp->data = ptr2->data;
}
else {
temp->data = ptr1->data;
}
if (root == NULL) {
root = temp;
}
else {
ptr = root;
while (ptr->next != NULL) {
ptr = ptr->next;
}
ptr->next = temp;
}
ptr1 = ptr1->next;
ptr2 = ptr2->next;
}
return root;
}
void printLinkedList(Node* root) {
while (root != NULL) {
cout << root->data << "->";
root = root->next;
}
cout << "NULL" << endl;
}
int main() {
Node *root1 = NULL, *root2 = NULL, *root = NULL;
insertNewNode(&root1, 1);
insertNewNode(&root1, 2);
insertNewNode(&root1, 3);
insertNewNode(&root1, 4);
cout << "First Linked List: ";
printLinkedList(root1);
insertNewNode(&root2, 0);
insertNewNode(&root2, 5);
insertNewNode(&root2, 2);
insertNewNode(&root2, 6);
cout << "Second Linked List: ";
printLinkedList(root2);
root = getNewLinkedList(root1, root2);
cout << "New Linked List: ";
printLinkedList(root);
return 0;
}

## Output

If you run the above code, then you will get the following result.

First Linked List: 1->2->3->4->NULL
Second Linked List: 0->5->2->6->NULL
New Linked List: 1->5->3->6->NULL

## Conclusion

If you have any queries in the tutorial, mention them in the comment section.

Updated on: 28-Jan-2021

2K+ Views

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