一元多项式求导 (25)

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#include <iostream>
using namespace std;

int main()
{
    int n, e;
    bool flag = false;
    while (cin >> n >> e)
    {
        if (n*e)
        {
            if (flag)
                cout << " ";
            cout << n*e << " " << e - 1;
            flag = true;
        }
    }
    if (!flag)
        cout << "0 0" << endl;

    //system("pause");
    return 0;
}