Rotate Image

Description:

You are given an n x n 2D matrix representing an image.

Rotate the image by 90 degrees (clockwise).

Follow up:
Could you do this in-place?

Code:

    void rotate(vector<vector<int>>& matrix) {
        int n = matrix.size();
        vector< vector<int> > temp(matrix);
        for (int i = 0; i < n; ++i)
        {
            for (int j = 0; j < n; ++j)
            {
                matrix[i][j] = temp[n-1-j][i];
            }
        }
    }