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:
list <ListNode> lnew ;
ListNode *addTwoNumbers(ListNode *l1, ListNode *l2) {
ListNode *temp1 = l1;
ListNode *temp2 = l2;
ListNode *res = new ListNode(0);
ListNode *temp3 = res;
int carry = 0;
while(temp1 != NULL || temp2 != NULL)
{
int val1 = 0;
int val2 = 0;
if(temp1 != NULL) { val1 = temp1->val; temp1 = temp1->next;}
if(temp2 != NULL) { val2 = temp2->val; temp2 = temp2->next;}
temp3->next = new ListNode((val1 + val2 + carry)%10);
carry = (val1 +val2 + carry)/10;
temp3 = temp3 ->next;
}
if(carry == 1) temp3->next = new ListNode(1);
return res->next;
}
};
注意:
1.l1 和 l2 不一定等长。
2.input {5} {5},考虑只有进位的情况。