题解 | #数字求和#

#include <iostream>
using namespace std;

int a, b;
int sum1, sum2;

int reverse(int x)
{
    int res = 0;
    while (x)
    {
        res = res * 10 + x % 10;
        x /= 10;
    }
    return res;
}

int main()
{
    while (cin >> a >> b)
    {
        sum1 = reverse(a+b);
        sum2 = reverse(a) + reverse(b);
        if (sum1 == sum2)
            cout << a + b << endl;
        else
            cout << "NO" << endl;
    }
    return 0;
}