Implement a function to reverse a linked list in place.

 Implement a function to reverse a linked list :

To implement a function to reverse a linked list, you would typically iterate through the linked list and change the direction of each pointer to point in the opposite direction. Here's a step-by-step approach:

1. Initialize three pointers: prev, curr, and next. Set prev and curr to NULL and next to the head of the linked list.
2. Traverse the linked list and for each node, do the following: a. Set curr to point to the current node. b. Set next to point to the next node. c. Set the current node's next pointer to point to the previous node (which is initially NULL for the first node). d. Set prev to point to the current node. e. Set curr to point to the next node (which is stored in the next pointer).
3. After the traversal is complete, set the head of the linked list to point to the last node (which is now the first node after the reversal).

Here's an example implementation of this approach in Python:

class Node:

    def __init__(self, val=None, next=None):

        self.val = val

        self.next = next

def reverse_list(head):

    prev = None

    curr = None

    next = head

   

    while next:

        curr = next

        next = next.next

        curr.next = prev

        prev = curr

   

    head = curr

   

    return head

This implementation iterates through the linked list and reverses the direction of each pointer, effectively reversing the linked list.

At each step of the iteration, we set next_node to the next node in the original list, so that we don't lose track of the rest of the list. We then set the next pointer of the current node to point to prev, effectively reversing the link. Finally, we update prev to be the current node, and current to be the next_node we saved earlier.

When we reach the end of the list (i.e., current is None), prev will be the new head of the reversed list, so we return it.

Note that this implementation modifies the original linked list in place, so if you need to preserve the original list, you should make a copy of it before calling reverse_linked_list().

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