rotate-image

题目：

题目描述

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?

 

 

 

 

 

 

解题一：

 

public class Solution {

/*
 * @author XueWeiWei
 * @date 2019/7/23 15:36
 */

public void rotate(int[][] matrix) {
int n=matrix.length;
for (int i = 0; i < n/2; i++) {
for (int j = i; j <n-i-1 ; j++) {
int tmpValue1=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]=tmpValue1;
}
}

}
}

public class Solution {
    public void rotate(int[][] matrix) {
        int n=matrix.length;
        for (int i = 0; i < n/2; i++) {
            for (int j = i; j <n-i-1 ; j++) {
                int tmpValue1=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]=tmpValue1;
            }
        }

    }
}