public int encontrarMayorSuma(int[][] matrix) {
        int suma = 0;
        String mayores = "";
        int mayor = -1;
        int i, j, k;
        int sum, maxSum = 0;
        int n=matrix.length;
        while (mayores.length()<matrix.length) {
            mayor=obtenerMayor(matrix, mayores);
            mayores+=mayor;
        }
        System.out.println("SUMA de los mayores: " + mayores);

        return maxSum;

    }

    public int obtenerMayor(int[][] matrix, String mayores) {
        int mayor = -1;

        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[0].length; j++) {

                if (matrix[i][j] > mayor && (mayores.indexOf(matrix[i][j] + "") == -1)) {
                    mayor = matrix[i][j];
                }
            }
        }
        return mayor;
    }