@Test
    public void testSearcha2DMatrix13() throws Exception {
        int[][] matrix = {
                {1, 2, 3}
        };
        int[] exists = existElem(matrix);
        for (int i : exists) {
            System.out.println("Estimate num = " + i);
            assert s.searchMatrix(matrix, i);
        }
        int[] nonExists = {7, 11, 12, 14, 15, 16, 18, 20, 21};
        for (int i : nonExists) {
            System.out.println("Estimate num = " + i);
            assert !s.searchMatrix(matrix, i);
        }
    }