for (int i = 0; i < n; ++i) {
        for (int j = i + 1; j < n; ++j) {

            int temp = matrix[i][j];

            matrix[i][j] = matrix[j][i];
            matrix[j][i] = temp;

        }
    }

    for (int i = 0; i < n; ++i) {

        for (int j = 0; j < (n / 2); ++j) {

            int tempMatrix = matrix[i][j];

            matrix[i][j] = matrix[i][n - j - 1];
            matrix[i][n - j - 1] = tempMatrix;

        }
    }