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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

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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:

  1. Initialize two pointers, first and second, and set them to point to the head of the linked list.

  2. Move the first pointer n nodes ahead in the linked list. If this is not possible because n is greater than the length of the list, then there is no node to remove, so return the original head.

  3. Now, move both first and second pointers one node at a time. When first reaches the end of the list, second will be pointing to the node just before the node to remove.

  4. At this point, you can remove the nth node from the end. To do this, make the next of the second node point to the node after its current next node.

  5. 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.

This problem has been solved

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