HELP 2d arrays sort by sum of numbers in a row

        const int rows = 5;
        const int cols = 3;
        int tocke = 0;
       
        int tekmovalci[rows][cols]={{7, 6, 9},
                                    {8, 7, 8},
                                    {6, 9, 10},
                                    {7, 7, 9},
                                    {8, 8, 10}};
                                       
        for(int r=0; r<rows; r++){
                cout << r+1 << ". ";
                for(int c=0; c<cols; c++){
                        cout << tekmovalci[r][c] << " ";
                        tocke += tekmovalci[r][c];       
                }
                cout << tocke << endl;
                tocke = 0;       
        }