求助求助 就过了两个

#include<iostream>
using namespace std;
int main()
{
   string s1, s2;
   int arr1[501], arr2[501], arr3[503];
   cin >> s1 >> s2;
   int len = s1.length();
   for (int i = 0; i < len; i++)
   {
   	arr1[len - 1 - i] = s1[i] - '0';
   }
   len = s2.length();
   for (int i = 0; i < len; i++)
   {
   	arr2[len - 1 - i] = s2[i] - '0';
   }
   if (len < s1.length())
   {
   	len = s1.length();
   }
   for (int i = 0; i < len; i++)
   {
   	arr3[i] = arr1[i] + arr2[i];
   	arr3[i + 1] = arr3[i] / 10;
   	arr3[i] = arr3[i] % 10;
   }
   if (arr3[len] > 0)
   {
   	len++;
   }
   for (int i = len-1; i>=0; i--)
   {
   	cout << arr3[i];
   }
   return 0;
}