System Engineer

You are given a Doubly linked list, where every node in the linked list contains two pointers ‘next’ and ‘prev’ which point to the next node and previous node in the list respectively. All nodes have some positive integer value associated with them. Your task is to insert an integer value ‘VAL’ in the linked list at a given position ‘K’.

Note:

The position given will always be less than or equal to the length of the linked list.
Assume that the Indexing for the linked list starts from 0.

EXAMPLE:

Input :
‘K’ = 3, ‘VAL’ = 4
list = [1, 2, 3]
Output: [1, 2, 3, 4]

The ‘VAL’ = 4, is inserted at end of the above doubly linked list.

You are given a Doubly Linked List of ‘N’ positive integers. Your task is to delete a node at position ‘POS’ in the linked list.

Note:

Assume that the Indexing for the linked list starts from 0.

EXAMPLE:

Input: ‘N’ = 5, 'LIST' = [1, 1, 2, 3, 4, -1], ‘POS’ = 1.

Output: 1 < - > 2 < - > 3 < - > 4 

Here in the given list, we can see that the node at position 1 is deleted.