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?

我直接开了一个大小相同的数组result，然后将result中的内容copy到原数组中

public class Solution {
        public void rotate(int[][] matrix) {
            int lengthOfMatrix = matrix.length;
            int [][]result = new int[lengthOfMatrix][lengthOfMatrix];
            for(int i = 0; i < lengthOfMatrix; i++){
                for(int j = lengthOfMatrix - 1, k = 0; j >= 0; j--, k++){
                    result[i][k] = matrix[j][i];
                }//for
            }//for
            for(int i = 0; i < lengthOfMatrix; i++){
                for(int j = 0; j < lengthOfMatrix; j++){
                    matrix[i][j] = result[i][j];
                }
            }
        }
    }

不过题目要求在原来数组的基础上面修改，这个还要看看别人的，我这样空间复杂度就为O(N)了