How to Reverse a Linked List | C++ Implementation
Given a singly linked list, we have to reverse it.
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Input list: { a, b, c, d, e }
Output list: { e, d, c, b, a }
There are two ways to reverse a linked list, iterative method and recursive method.
Iterative Method
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Node* iterativeReverse(Node* head)
{
Node *previous = nullptr;
Node *nextNode = nullptr;
while(head)
{
nextNode = head->next;
head->next = previous;
previous = head;
head = nextNode;
}
return previous;
}
Recursive Method
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Node* recursiveReverse(Node* head)
{
if(head == nullptr)
return nullptr;
if(head->next == nullptr)
return head;
Node *firstElement = head;
Node *secondElement = firstElement->next;
head = firstElement->next;
firstElement->next = nullptr; //unlink first node
Node *remainingList = recursiveReverse(head);
secondElement->next = firstElement;
return remainingList;
}
C++ Implementation to reverse a Linked List
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#include <iostream>
#include <utility>
template <class T>
class LinkedList
{
struct Node
{
T data;
Node * next;
Node(T value) : data(std::move(value)), next(nullptr) {}
};
Node *head;
public:
LinkedList() : head(nullptr) {}
LinkedList(const LinkedList& ll) = delete; //copy constructor
LinkedList(const LinkedList&& ll) = delete; //move constructor
LinkedList& operator=(const LinkedList& ll) = delete; //copy assignment
LinkedList& operator=(const LinkedList&& ll) = delete; //move assignment
~LinkedList();
void insert(T);
void printList();
void iterativeReverse()
{
head = iterativeReverse(head);
}
private:
Node* iterativeReverse(Node* head)
{
Node *previous = nullptr;
Node *nextNode = nullptr;
while(head)
{
nextNode = head->next;
head->next = previous;
previous = head;
head = nextNode;
}
return previous;
}
};
template <class T>
void LinkedList<T>::insert(T data)
{
Node *node = new Node(std::move(data));
Node *tmp = head;
if(tmp == nullptr)
{
head = node;
}
else
{
while(tmp->next != nullptr)
{
tmp = tmp->next;
}
tmp->next = node;
}
}
template <class T>
void LinkedList<T>::printList()
{
Node *node = head;
while(node)
{
std::cout << node->data << " ";
node = node->next;
}
std::cout<<"\n";
}
template <class T>
LinkedList<T>::~LinkedList()
{
Node *tmp = nullptr;
while(head)
{
tmp = head;
head = head->next;
delete tmp;
}
head = nullptr;
}
int main()
{
LinkedList<char> ll1;
ll1.insert('p');
ll1.insert('r');
ll1.insert('o');
ll1.insert('g');
ll1.insert('r');
ll1.insert('a');
ll1.insert('m');
ll1.printList();
ll1.iterativeReverse();
ll1.printList();
}
View this code on Github
Get this post in pdf - Reverse Linked List
Reference:
Introduction to Algorithms
The Algorithm Design Manual
Data Structures and Algorithms Made Easy
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