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Subtract Two Linkedlist

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1. You are give two single linkedlist of digits. 
2. The most significant digit comes first and each of their nodes contain a single digit. Subtract the two numbers and return it as a linked list.
3. You may assume the two numbers do not contain any leading zero, except the number 0 itself.
4. any list can be larger in term of number.
Input Format 
1->2->3->4->5->6->7->null
7->8->9->null
Output Format 
1->2->3->3->7->7->8->null
Question Video
Constraints 
0 <= N <= 10^6
Sample Input 
6
1 8 0 5 4 6 
1
1
Sample Output 
1 8 0 5 4 5


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