c++输入输出

int main() {
    int t, a, b;
    cin >> t;
    
    vector<vector<int>> m;
    for (int i = 1; i < t; ++i) {
        vector<int> m1;
        cin >> a >> b;
        m1.push_back(a);
        m1.push_back(b);
        m.push_back(m1);
    }
    print_::print1 prn;
    cout << m[1][0] << endl;
    cout << m[1][1] << endl;

    return 0;
}