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Delete a linked list using recursion

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  • Difficulty Level : Easy
  • Last Updated : 01 Aug, 2022
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Delete the given linked list using recursion

Method:

  1. If head equal to NULL then linked list is empty, we simply return. 
  2. Recursively delete linked list after head node. 
  3. Delete head node. 

Implementation:

C++




// C++ program to recursively delete a linked list
#include <bits/stdc++.h>
 
/* Link list node */
struct Node {
    int data;
    struct Node* next;
};
 
/* Recursive Function to delete the entire linked list */
void deleteList(struct Node* head)
{
    if (head == NULL)
        return;
    deleteList(head->next);
    free(head);
}
 
/* Given a reference (pointer to pointer) to
   the head of a list and an int, push a new
   node on the front of the list. */
void push(struct Node** head_ref, int new_data)
{
    struct Node* new_node = new Node;
    new_node->data = new_data;
    new_node->next = (*head_ref);
    (*head_ref) = new_node;
}
 
/* Driver program to test count function*/
int main()
{
    /* Start with the empty list */
    struct Node* head = NULL;
 
    /* Use push() to construct below list
    1->12->1->4->1 */
    push(&head, 1);
    push(&head, 4);
    push(&head, 1);
    push(&head, 12);
    push(&head, 1);
    printf("\n Deleting linked list");
    deleteList(head);
   
      // Since head now points to illgal address, we should set head = NULL:
      head = NULL;
    printf("\nLinked list deleted");
    return 0;
}

Java




// Java program to recursively delete a linked list
class GFG
{
 
/* Link list node */
static class Node
{
    int data;
    Node next;
};
 
/* Recursive Function to delete
the entire linked list */
static void deleteList(Node head)
{
    if (head == null)
        return;
    deleteList(head.next);
    System.gc();
}
 
/* Given a reference (pointer to pointer) to
the head of a list and an int, push a new
node on the front of the list. */
static void push(Node head_ref, int new_data)
{
    Node new_node = new Node();
    new_node.data = new_data;
    new_node.next = head_ref;
    head_ref = new_node;
}
 
/* Driver code*/
public static void main(String[] args)
{
    /* Start with the empty list */
    Node head = new Node();
 
    /* Use push() to construct below list
    1->12->1->4->1 */
    push(head, 1);
    push(head, 4);
    push(head, 1);
    push(head, 12);
    push(head, 1);
    System.out.print("\nDeleting linked list");
    deleteList(head);
    System.out.print("\nLinked list deleted");
}
}
 
/* This code contributed by PrinciRaj1992 */

Python3




# Python3 program to recursively delete
# a linked list
import math
 
# Link list node
class Node:
    def __init__(self, data):
        self.data = data
        self.next = None
 
# Recursive Function to delete
# the entire linked list
def deleteList(head):
    if (head == None):
        return
    deleteList(head.next)
    # free(head)
 
# Given a reference (pointer to pointer) to the head
# of a list and an int, head=push a new node
# on the front of the list.
def push(head_ref, new_data):
    new_node = Node(new_data)
    new_node.data = new_data
    new_node.next = head_ref
    head_ref = new_node
    return head_ref
 
# Driver Code
if __name__=='__main__':
     
    # Start with the empty list
    head = None
 
    # Use head=push() to construct below list 1.12.1.4.1
    head = push(head, 1)
    head = push(head, 4)
    head = push(head, 1)
    head = push(head, 12)
    head = push(head, 1)
    print("Deleting linked list")
    deleteList(head)
    print("Linked list deleted")
     
# This code is contributed by Srathore

C#




// C# program to recursively delete a linked list
using System;
 
class GFG
{
 
/* Link list node */
public class Node
{
    public int data;
    public Node next;
};
 
/* Recursive Function to delete
the entire linked list */
static void deleteList(Node head)
{
    if (head == null)
        return;
    deleteList(head.next);
}
 
/* Given a reference (pointer to pointer) to
the head of a list and an int, push a new
node on the front of the list. */
static void push(Node head_ref, int new_data)
{
    Node new_node = new Node();
    new_node.data = new_data;
    new_node.next = head_ref;
    head_ref = new_node;
}
 
/* Driver code*/
public static void Main(String[] args)
{
    /* Start with the empty list */
    Node head = new Node();
 
    /* Use push() to construct below list
    1->12->1->4->1 */
    push(head, 1);
    push(head, 4);
    push(head, 1);
    push(head, 12);
    push(head, 1);
    Console.Write("\nDeleting linked list");
    deleteList(head);
    Console.Write("\nLinked list deleted");
}
}
 
// This code contributed by Rajput-Ji

Javascript




<script>
 
// JavaScript program to recursively delete a linked list
 
/* Link list node */
class Node
{
    constructor()
    {
        this.data = 0;
        this.next = null;
    }
};
 
/* Recursive Function to delete
the entire linked list */
function deleteList(head)
{
    if (head == null)
        return;
    deleteList(head.next);
}
 
/* Given a reference (pointer to pointer) to
the head of a list and an int, push a new
node on the front of the list. */
function push(head_ref, new_data)
{
    var new_node = new Node();
    new_node.data = new_data;
    new_node.next = head_ref;
    head_ref = new_node;
}
 
/* Driver code*/
/* Start with the empty list */
var head = new Node();
/* Use push() to construct below list
1->12->1->4->1 */
push(head, 1);
push(head, 4);
push(head, 1);
push(head, 12);
push(head, 1);
document.write("Deleting linked list");
deleteList(head);
document.write("<br>Linked list deleted");
 
 
</script>

Output

 Deleting linked list
Linked list deleted

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