#include <iostream>
#include <fstream>

using namespace std;


int main() {
    const char* filename = "matrix.backup";

    int row = 3, col = 3;
    int* matrix = new int [row*col];

    for(int i = 0; i < row; ++i) {
    for(int j = 0; j < col; ++j) {
        matrix[i*col + j] = i*col + j;
    }
    }

    ofstream output_file_stream;
    output_file_stream.open(filename);
    for(int i = 0; i < row; ++i) {
    for(int j = 0; j < col; ++j) {
        output_file_stream << matrix[i*col + j] << " ";
    }

    output_file_stream << endl;
    }

    delete [] matrix;

    return 0;
}