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Reverse A Linkedlist

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You have given a pointer to the head node of a linked list, the task is to reverse the linked list. 
We need to reverse the list by changing the links between nodes.
Input Format 
1->2->3->4->5->6->7->null
Output Format 
7->6->5->4->3->2->1->null
Question Video
Constraints 
0 <= N <= 10^6
Sample Input 
7
1 2 3 4 5 6 7
Sample Output 
7 6 5 4 3 2 1


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