挺简单的（C++）

#include <iostream>
using namespace std;
int main()
{
    char c;
    if (cin >> c)
    {
        if (c == 'y' || c == 'Y')
        {
            cout << "Yes" << endl;
        } 
        else if (c == 'n' || c == 'N')
        {
            cout << "No" << endl;
        }
    }
    return 0;
}