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Middle Of A Linked List

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given a singly linked list with head node head, return a middle node of linked list.
if there is 2 mid node then return first mid node.
Input Format 
1->2->3->4->5->6->7->null
1->2->3->4->5->6->null
Output Format 
4->5->6->7->null
3->4->5->6->null
Question Video
Constraints 
0 <= N <= 10^6
Sample Input 
7
1 2 3 4 5 6 7
Sample Output 
4 5 6 7


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