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
Constraints
0 <= N <= 10^6
Notice
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Input
6 1 8 0 5 4 6 1 1
Output
1 8 0 5 4 5