Print in Reverse


Problem Statement :


Given a pointer to the head of a singly-linked list, print each data value from the reversed list. If the given list is empty, do not print anything.

Example

 head* refers to the linked list with data values 1->2->3->Null

Print the following:
3
2
1


Function Description:

Complete the reversePrint function in the editor below.

reversePrint has the following parameters:

SinglyLinkedListNode pointer head: a reference to the head of the list


Prints

The data values of each node in the reversed list.


Input Format:

The first line of input contains t, the number of test cases.

The input of each test case is as follows:
          1. The first line contains an integer n, the number of elements in the list.
          2. Each of the next n lines contains a data element for a list node.


Constraints:
          1.   1<=n<=1000
          2.   1<=list[i]<=1000



Solution :



title-img


                            Solution in C :

In C:

//the following fuction is all that is needed to complete the 
//challenge in hackerrank platform.

void reversePrint(SinglyLinkedListNode* head) {
    
SinglyLinkedListNode* current=head,*next,*prev=NULL;
    while(current!=NULL)
    {   next=current->next;
        current->next=prev;
        prev=current;
        current=next;
     
       
        
    }
    head=prev;
    SinglyLinkedListNode* temp=head;
    while(temp!=NULL)
    {
        printf("%d\n",temp->data);
        temp=temp->next;
    }

}








In C++:

//the following fuction is all that is needed to complete the 
//challenge in hackerrank platform.

void ReversePrint(Node *head)
{
  // This is a "method-only" submission. 
  // You only need to complete this method. 
    if(head!=NULL)
    {
        ReversePrint(head->next);
        cout<<head->data<<"\n";
    }
   
}








In Java: 

//the following method is all that is needed to complete the
//challenge in hackerrank platform.

  static void reversePrint(SinglyLinkedListNode head) {
        if(head.next != null) {
            reversePrint(head.next);
        }
        System.out.println(head.data);
        
    }








In Python 3 :

//the following method is all that is needed to complete the
//challenge in hackerrank platform.

def ReversePrint(head):
    if head is None:
        return
    ReversePrint(head.next)
    print(head.data)
                        








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