Add Two Numbers
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) {
ListNode *p=l1,*q=l2,*r;
ListNode *nh=new ListNode(0);
r=nh;
int c=0,s;
while(p||q){
s=c;
if(p)s+=p->val;
if(q)s+=q->val;
r->next=new ListNode(s%10);
c=s/10;
r=r->next;
if(p)p=p->next;
if(q)q=q->next;
}
if(c)r->next=new ListNode(c);
return nh->next;
}
};