Clone a Linked List with next & random pointer | Linear Time Solution without Hash Map | Linked Lis

Practice Link : https://practice.geeksforgeeks.org/problems/clone-a-linked-list-with-next-and-random-pointer/1

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ZERO SUM SUBARAAYS PROBLEM : ZERO SUM SUBARAAYS PROBLEM
Clone a Linked List with next & random pointer : https://youtu.be/Z628U42aoO0
MINIMUM SWAPS REQUIRED TO SORT AN ARRAY IN HINDI : https://youtu.be/4aWvCk1dpqo
Knight Walk Problem : https://youtu.be/tVHB7HC7L5w

You are given a Double Link List with one pointer of each node pointing to the next node just like in a single link list. The second pointer however CAN point to any node in the list and not just the previous node. Now write a program in O(n) time to duplicate this list. That is, write a program which will create a copy of this list.

Let us call the second pointer as arbitary pointer as it can point to any arbitrary node in the linked list.

Steps:
This method stores the next and arbitrary mappings (of original list) in an array first, then modifies the original Linked List (to create copy), creates a copy. And finally restores the original list.

1) Create all nodes in copy linked list using next pointers.
2) Store the node and its next pointer mappings of original linked list.
3) Change next pointer of all nodes in original linked list to point to the corresponding node in copy linked list.

Time Complexity: O(n)
Auxiliary Space: O(1)

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#random pointer
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#arbitary pointer
#random pointer
#double linked list
#java code
#data structure
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