My solution in Java


  • 0
    H

    public class Solution {
        public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
            if (l1 == null || l2 == null) {
                return null;
            }
            ListNode head = null;
            ListNode tail = null;
            int carry = 0;
            while (l1 != null || l2 != null || carry != 0) {
                int sum = 0;
                if (l1 != null) {
                    sum += l1.val;
                }
                if (l2 != null) {
                    sum += l2.val;
                }
                sum += carry;
                int val = sum % 10;
                ListNode node = new ListNode(val);
                if (head == null) {
                    tail = node;
                    head = tail;
                } else {
                    tail.next = node;
                    tail = tail.next;
                }
                carry = sum / 10;
                if (l1 != null) {
                    l1 = l1.next;
                }
                if (l2 != null) {
                    l2 = l2.next;
                }
            }
            return head;
        }
    }
    

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