leetCode 48.Rotate Image (旋转图像) 解题思路和方法

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?

思路：其实就是旋转数组，没有什么难度，代码如下：

public class Solution {    public void rotate(int[][] matrix) {    int[][] a = new int[matrix.length][matrix.length];    //实现深拷贝    for(int i = 0; i < matrix.length; i++){    for(int j = 0; j < matrix.length;j++){    a[i][j] = matrix[i][j];    }    }    //数据旋转        for(int i = 0; i < a[0].length; i++){            int k = 0;            for(int j = a.length-1; j >=0; j--){                matrix[i][k++] = a[j][i];                //System.out.print(a[j][i] + " ");            }            //System.out.println("");        }    }}