C++ Linked List Exercises: Delete the nth node of a Singly Linked List from end
C++ Linked List: Exercise-13 with Solution
Write a C++ program to delete the nth node of a Singly Linked List from the end.
Test Data:
Original list:
7 5 3 1
Remove the 2nd node from the end of the said list:
Updated list:
7 5 1
Remove the 3rd node from the end of the said list:
Updated list:
5 1
Sample Solution:
C++ Code:
#include <iostream>
using namespace std;
struct Node
{
int num;
Node *next;
}; //node constructed
int size = 0;
void insert(Node** head, int num){
Node* new_Node = new Node();
new_Node->num = num;
new_Node->next = *head;
*head = new_Node;
size++;
}
Node* delete_last_node(Node* head, int n) {
Node *p = head, *q = head;
while (n--) q = q->next;
if (!q) return head->next;
while (q->next) {
p = p->next;
q = q->next;
}
Node* toDelete = p->next;
p->next = p->next->next;
delete toDelete;
return head;
}
//Display all nodes
void display_all_nodes(Node* node)
{
while(node!=NULL){
cout << node->num << " ";
node = node->next;
}
}
int main()
{
Node* head = NULL;
insert(&head,1);
insert(&head,3);
insert(&head,5);
insert(&head,7);
cout << "Original list:\n";
display_all_nodes(head);
int pos = 2;
cout << "\n\nRemove the " << pos << "nd node from the end of the said list:";
cout << "\nUpdated list:\n";
head = delete_last_node(head, pos);
display_all_nodes(head);
pos = 3;
cout << "\n\nRemove the " << pos << "rd node from the end of the said list:";
cout << "\nUpdated list:\n";
head = delete_last_node(head, pos);
display_all_nodes(head);
cout<<endl;
return 0;
}
Sample Output:
Original list: 7 5 3 1 Remove the 2nd node from the end of the said list: Updated list: 7 5 1 Remove the 3rd node from the end of the said list: Updated list: 5 1
Flowchart:


CPP Code Editor:
Contribute your code and comments through Disqus.
Previous C++ Exercise: Delete the last node of a Singly Linked List.
Next C++ Exercise: Kth node from the Middle towards Head of a Linked List.
What is the difficulty level of this exercise?
C++ Programming: Tips of the Day
Why is there no std::stou?
The most pat answer would be that the C library has no corresponding "strtou", and the C++11 string functions are all just thinly veiled wrappers around the C library functions: The std::sto* functions mirror strto*, and the std::to_string functions use sprintf.
Ref: https://bit.ly/3wtz2qA
- Weekly Trends
- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook