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January 7, 2020 11:06
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addTwoNumbers
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| var p1: ListNode? = l1 | |
| var p2: ListNode? = l2 | |
| var resultNode: ListNode? = ListNode(0) | |
| let head = resultNode | |
| var carry = 0 | |
| while p1 != nil || p2 != nil || carry > 0 { | |
| let val1 = p1?.val ?? 0 | |
| let val2 = p2?.val ?? 0 | |
| let sum = val1 + val2 + carry | |
| let value = sum % 10 | |
| carry = sum / 10 | |
| resultNode?.next = ListNode(value) | |
| resultNode = resultNode?.next | |
| p1 = p1?.next | |
| p2 = p2?.next | |
| } | |
| return head?.next |
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