How to Fix Linked List Reversal Errors

In this tutorial, you'll learn about How to Fix Linked List Reversal Errors. We cover key concepts, practical examples, and best practices.

Fix linked list reversal errors when pointer chaining breaks by overwriting next before saving.

Quick Fix

Wrong

def rev(head):
    p=None; c=head
    while c:
        c.next=p; p=c; c=c.next

Overwrites c.next before saving. Loses rest of list.

Right

def rev(head):
    p=None; c=head
    while c:
        n=c.next; c.next=p; p=c; c=n
    return p

1->2->3->4->5 -> 5->4->3->2->1. O(n).

Prevention

Save c.next in temp before overwriting. Use three pointers.

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