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class Solution { public ListNode addTwoNumbers(ListNode l1, ListNode l2) { ListNode dummyHead = new ListNode(0); ListNode tail = dummyHead; int carry = 0; while (l1 != null || l2 != null || carry != 0) { int digit1 = (l1 != null) ? l1.val : 0; int digit2 = (l2 != null) ? l2.val : 0; int sum = digit1 + digit2 + carry; int digit = sum % 10; carry = sum / 10; ListNode newNode = new ListNode(digit); tail.next = newNode; tail = tail.next; l1 = (l1 != null) ? l1.next : null; l2 = (l2 != null) ? l2.next : null; } ListNode result = dummyHead.next; dummyHead.next = null; return result; } }
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for 30 minutes
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everlasting (like CCCP)
