Rotate Image 二维数组旋转90度

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?

class Solution {
public:
    void rotate(vector<vector<int> > &matrix) {
    //方法1：tempMatrix[j][n-1-i] = matrix[i][j]; 置换
    //方法2：先对角线翻转，再中间线上下翻转
    int n,i,j,temp;
    n=matrix.size();
    for(i=0;i<n;i++)
    {
        for(j=0;j<n-i;j++)
        {
            temp=matrix[i][j];
            matrix[i][j]=matrix[n-1-j][n-1-i];
            matrix[n-1-j][n-1-i]=temp;
        }
    }
    for(i=0;i<n/2;i++)
    {
        for(j=0;j<n;j++)
        {
            temp=matrix[i][j];
            matrix[i][j]=matrix[n-1-i][j];
            matrix[n-1-i][j]=temp;
        }
    }
    }
};