How to Fix Remove Nth Node From End Errors

In this tutorial, you'll learn about How to Fix Remove Nth Node From End Errors. We cover key concepts, practical examples, and best practices.

Fix remove nth node from end errors when pointer offsets miscount or removing head fails without dummy.

Quick Fix

Wrong

def rem(h,n):
    l=0; c=h
    while c: l+=1; c=c.next
    t=l-n
    if t==0: return h.next
    c=h
    for _ in range(t-1): c=c.next
    c.next=c.next.next
    return h

Two passes. Negative index when n equals length.

Right

def rem(h,n):
    d=ListNode(0,h)
    f=s=d
    for _ in range(n+1): f=f.next
    while f: f=f.next; s=s.next
    s.next=s.next.next
    return d.next

1->2->3->4->5, n=2 -> 1->2->3->5. One pass. O(n).

Prevention

Use dummy for uniform edge handling. Advance first n+1 ahead.

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