public void firstAns(int[][] matrix, int n)
        {
            for (int rn = 0; rn < n / 2; rn++)
            {
                for (int i = rn; i < n - 1-rn; i++)
                {
                    int temp = matrix[rn][i];
                    matrix[rn][i] = matrix[n - 1 - i][rn]; 
                    matrix[n - 1 - i][rn] = matrix[n - 1 - rn][n - 1 - i];
                    matrix[n - 1 - rn][n - 1 - i] = matrix[i][n - 1 - rn];
                    matrix[i][n - 1 - rn] = temp;

                }
            }
}