/**
knakul853
 */
class Solution {
public:
    ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {

      ListNode *p=l1;
      ListNode *q = l2;
      ListNode *ans = new ListNode(0);
      ListNode *curr = ans;
        int carry=0;
    while(p!=NULL || q!=NULL)
    {
        int n1 = p!=NULL?p->val:0;
        int n2 = q!=NULL?q->val:0;
        int sm = n1 + n2 +  carry;
        carry=sm/10;
        curr->next = new ListNode(sm%10);
        curr = curr->next;
        if(p!=NULL)p=p->next;
        if(q!=NULL)q=q->next;

    }
        if(carry){
            curr->next=new ListNode(carry);
            curr=curr->next;
    }
        return ans->next;




    }
};