LeetCode: Rotate Image

Rotate Image

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?

public class Solution {
    public void rotate(int[][] matrix) {
        // Start typing your Java solution below
        // DO NOT write main() function
        int n=matrix.length;
        for(int i=0;i<n/2;i++){
            for(int j=0;j<Math.ceil(((double)n)/2.);j++){
                int temp=matrix[i][j];
                matrix[i][j]=matrix[n-1-j][i];
                matrix[n-1-j][i]=matrix[n-1-i][n-1-j];
                matrix[n-1-i][n-1-j]=matrix[j][n-1-i];
                matrix[j][n-1-i]=temp;
            }
        }
    }
}