```` // this is a code class Solution { public: ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) { int carry = 0, first, second; ListNode *head = new ListNode(0), *tail = head; **while (l1 || l2 || carry)** { if (l1) { first = l1->val; l1 = l1->next; } else first = 0; if (l2) { second = l2->val; l2 = l2->next; } > Blockquote ````
a || b
var
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