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| 1 | +# Definition for singly-linked list. |
| 2 | +class ListNode(object): |
| 3 | + def __init__(self, x): |
| 4 | + self.val = x |
| 5 | + self.next = None |
| 6 | + |
| 7 | + |
| 8 | +class Solution(object): |
| 9 | + def addTwoNumbers(self, l1, l2): |
| 10 | + """ |
| 11 | + :type l1: ListNode |
| 12 | + :type l2: ListNode |
| 13 | + :rtype: ListNode |
| 14 | + """ |
| 15 | + temp = 1 if (l1.val + l2.val) >= 10 else 0 |
| 16 | + head = ListNode((l1.val + l2.val) % 10) |
| 17 | + tail = head |
| 18 | + while l1.next is not None or l2.next is not None or temp == 1: |
| 19 | + l1 = l1.next if l1.next is not None else ListNode(0) |
| 20 | + l2 = l2.next if l2.next is not None else ListNode(0) |
| 21 | + node = ListNode((l1.val + l2.val + temp) % 10) |
| 22 | + temp = 1 if (l1.val + l2.val + temp) >= 10 else 0 |
| 23 | + tail.next = node |
| 24 | + tail = node |
| 25 | + return head |
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