Insert a Node at the Tail of a Linked List Hackerrank
You are given the pointer to the head node of a linked list and an integer to add to the list. Create a new node with the given integer. Insert this node at the tail of the linked list and return the head node. The given head pointer may be null, meaning that the initial list is empty.
Input Format
You have to complete the Node* Insert(Node* head, int data) method. It takes two arguments: the head of the linked list and the integer to insert. You should not read any input from the stdin/console.
Output Format
Insert the new node at the tail and just return the head of the updated linked list. Do not print anything to stdout/console.
Sample Input
NULL, data = 2
2 –> NULL, data = 3
Sample Output
2 –>NULL
2 –> 3 –> NULL
Explanation
1. We have an empty list, and we insert 2.
2. We start with a 2 in the tail. When 3 is inserted, 3 then becomes the tail.
Solution of Insert a Node at the Tail of a Linked List Hackerrank
To insert a node at the tail, we need to find the last node and insert a new node after this node and update the next pointer of this node.
/*
Insert Node at the end of a linked list
head pointer input could be NULL as well for empty list
Node is defined as
struct Node
{
int data;
struct Node *next;
}
*/
Node* Insert(Node *head,int data)
{
Node *tmp = new Node();
tmp->data = data;
tmp->next = NULL;
if(head == NULL) {
head = tmp;
return head;
}
Node *current = head;
while(current->next != NULL) {
current = current->next;
}
current->next = tmp;
return head;
// Complete this method
}
/*
Insert Node at the end of a linked list
head pointer input could be NULL as well for empty list
Node is defined as
class Node {
int data;
Node next;
}
*/
Node Insert(Node head,int x) {
// This is a "method-only" submission.
// You only need to complete this method.
Node n = new Node();
n.data = x;
n.next = null;
if(head == null){
head = n;
return head;
}
else
{
Node c = head;
while(c.next != null){
c = c.next;
}
c.next = n;
return head;
}
}
"""
Insert Node at the end of a linked list
head pointer input could be None as well for empty list
Node is defined as
class Node(object):
def __init__(self, data=None, next_node=None):
self.data = data
self.next = next_node
return back the head of the linked list in the below method
"""
def Insert(head, data):
new_node = Node(data)
if head:
node = head
while node.next:
node = node.next
node.next = new_node
else:
head = new_node
return head
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