You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8

/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
int sum = l1->val + l2->val;
int carry = sum/;
ListNode* root = new ListNode(sum%);
ListNode* current = root; l1 = l1->next;
l2 = l2->next;
while(l1 && l2){
sum = l1->val + l2->val + carry;
carry = sum/;
current->next = new ListNode(sum%);
current = current->next;
l1 = l1->next;
l2 = l2->next;
} while(l1){
sum = l1->val+ carry;
carry = sum/;
current->next = new ListNode(sum%);
current = current->next;
l1 = l1->next;
} while(l2){
sum = l2->val+ carry;
carry = sum/;
current->next = new ListNode(sum%);
current = current->next;
l2 = l2->next;
} if(carry){
current->next = new ListNode(carry);
}
return root;
}
};

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