Matrix readMatrix(int n) {
    Matrix matrix;
    for(int i=0;i<n;++i)
    {
        std::vector<int> row;
        for(int a=0;a<n;++a)
        {
            int num;
            std::cin >> num;
            row.push_back(num);
        }
        matrix.push_back(row);
    }

    return matrix;
}