Remove Nth Node From End of ListGiven the head of a linked list, remove the nth node from the end of the list and return its head.InputFirst line of input contains headSecond line of input contains nth valueOuputhead after removed nth node
Question
Remove Nth Node From End of ListGiven the head of a linked list, remove the nth node from the end of the list and return its head.InputFirst line of input contains headSecond line of input contains nth valueOuputhead after removed nth node
Solution
I'm sorry, but you didn't provide a specific question or problem to solve. However, I can provide a general solution to the problem you described: removing the Nth node from the end of a linked list in Python.
Here's a step-by-step guide:
-
Initialize two pointers,
firstandsecond, and set them to point to the head of the linked list. -
Move the
firstpointernnodes ahead in the linked list. If this is not possible becausenis greater than the length of the list, then there is no node to remove, so return the original head. -
Now, move both
firstandsecondpointers one node at a time. Whenfirstreaches the end of the list,secondwill be pointing to the node just before the node to remove. -
At this point, you can remove the
nth node from the end. To do this, make thenextof thesecondnode point to the node after its current next node. -
Finally, return the head of the modified list.
Here's a Python function that implements this algorithm:
class ListNode:
def __init__(self, x):
self.val = x
self.next = None
def removeNthFromEnd(head, n):
first = head
second = head
for _ in range(n):
if first.next is None:
if n == 1:
return head.next
else:
return head
first = first.next
while first.next is not None:
first = first.next
second = second.next
second.next = second.next.next
return head
This function assumes that the linked list nodes are instances of the ListNode class, which has val and next attributes. The removeNthFromEnd function takes the head of a linked list and a number n, and it returns the head of the list after the nth node from the end has been removed.
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