2D array size problem loading from csv file

int main()
{

    auto base_dir = fs::current_path();
    auto dataset_1 = data_names_1;
    auto dataset_name = base_dir / "NAimg_20101026_145727.csv";

    //double data[10][3];
    std::ifstream file(dataset_name);

    matrix<DataType> data_length;
    file >> data_length;
    
    auto pre_num_row = data_length.nc();
    static const int num_row = 73;//data_length.nr();
    static const int num_column = 74496; //data_length.nc();

    std::cout << num_row << "\n";
    std::cout << num_column << "\n";

    double data[73][74496];

    for (int row = 0; row < 73; ++row)
    {
        std::string line;
        std::getline(file, line);
        if (!file.good())
            break;

        std::stringstream iss(line);

        for (int col = 0; col < 74496; ++col)
        {
            std::string val;
            std::getline(iss, val, ',');
            if (!iss.good())
                break;

            std::stringstream convertor(val);
            convertor >> data[row][col];
        }
    }

    std::cout << data[1][1] << "\n";
  
}

Hello, My name is Q. I want to read a csv file (here the name of the file is NAimg_20101026_145727.csv) and load the data to data array. The size of row and column of the file is 73 and 74496. Therefore, I need double data[73][74496] array. It makes error. When I make a small array, for example, double data[10][20], there is no error. Do you know what is the problem?

I have one more issue. I want to read the size of row and column from csv file and automatically decide the size of double data[row][column]. Therefore, I tried to use data_length.nc(); to decide the row and column of the double data size. Do you know how to decide the size of double data[row][column] from csv file? Thanks

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