https://pintia.cn/problem-sets/994805260223102976/problems

#include <iostream>
using namespace std;
int main() {
    int a, b, flag = 0;
    while (cin >> a >> b) {
        if (b != 0) {            //当b!=0时，因为给出的是所有非零项系数，所以必定会有输出
            if (flag == 1) cout << " ";
            cout << a * b << " " << b - 1;
            flag = 1;
        }
    }
    if (flag == 0) cout << "0 0";
    return 0;
}