48. Rotate Image

class Solution {
    public void rotate(int[][] matrix) {
        int n = matrix.length;
        int temp;
        for (int i = 0; i < n / 2; i++) {
            for (int j = i; j < n - i - 1; j++) {
                // lt -> rt
                temp = rotateSingle(matrix, j, n - i - 1, matrix[i][j]);
                // rt -> rb
                temp = rotateSingle(matrix, n - i - 1, n - j - 1, temp);
                // rb -> lb
                temp = rotateSingle(matrix, n - j - 1, i, temp);
                // lb -> lt
                temp = rotateSingle(matrix, i, j, temp);
            }
        }
    }

    public int rotateSingle(int[][] matrix, int dsti, int dstj, int newValue) {
        int temp = matrix[dsti][dstj];
        matrix[dsti][dstj] = newValue;
        return temp;
    }
}