ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
ListNode *dummy = new ListNode();
ListNode *temp = dummy;
int carry = 0;
while( (l1 != NULL || l2 != NULL) || carry) {
int sum = 0;
if(l1 != NULL) {
sum += l1->val;
l1 = l1 -> next;
}
if(l2 != NULL) {
sum += l2 -> val;
l2 = l2 -> next;
}
sum += carry;
carry = sum / 10;
ListNode *node = new ListNode(sum % 10);
temp -> next = node;
temp = temp -> next;
}
return dummy -> next;
}
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