You are given two non-empty linked lists representing two non-negative integers. 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.
You may assume the two numbers do not contain any leading zero, except the number 0 itself.
Example:
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
Explanation: 342 + 465 = 807.
#include<stdio.h>
using namespace std;
// 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 digit = 0, carry = 0;
ListNode* res = new ListNode(0), *p = res;
while (l1 || l2 || carry) {
digit = carry;
if (l1) {
digit += l1->val;
l1 = l1->next;
}
if (l2) {
digit += l2->val;
l2 = l2->next;
}
carry = digit / 10;
if (digit > 9) {
digit %= 10;
}
p->next = new ListNode(digit);
p = p->next;
}
return res->next;
}
};
ListNode* creatList(int a[], int size) {
ListNode* res = new ListNode(0), *p = res;
for (int i = 0; i < size; i++) {
p->next = new ListNode(a[i]);
p = p->next;
}
p->next = NULL;
return res->next;
}
void printList(ListNode* L) {
ListNode *p = L;
while (p->next!=NULL) {
printf("%d -> ", p->val);
p = p->next;
}
printf("%d", p->val);
}
int main() {
int L1[] = { 2,4,3 };
int L2[] = { 5,6,4 };
ListNode* l1 = creatList(L1, sizeof(L1) / sizeof(int));
ListNode* l2 = creatList(L2, sizeof(L2) / sizeof(int));
ListNode* l3 = Solution().addTwoNumbers(l1, l2);
printList(l3);
return 0;
}