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Unfold Of Linkedlist

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Given a singly linkedlist : l0 -> ln -> l1 -> ln-1 -> l2 -> ln-2 -> l3 -> ln-3 -> ..... 
reorder it : l0 -> l1 -> l2 -> l3 -> l4 -> l5 -> l6 ..... -> ln-1 -> ln
for more information watch video.
Input Format
1->7->2->6->3->5->4->null
Output Format
1->2->3->4->5->6->7->null
Question Video
Constraints
0 <= N <= 10^6
Sample Input
9 5 1 1 4 4 6 6 9 9 
Sample Output
5 1 4 6 9 9 6 4 1 


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