力扣-48-转转图像

#include <algorithm>
using namespace std;

class Solution {
public:
    void rotate(vector<vector<int>>& matrix) {
       int n =  matrix.size();
        
        /*先转置矩阵*/
        for(int i = 0; i < n; i++)
            for(int j = 0; j <= i; j++){
                int temp;
                temp = matrix[i][j];
                matrix[i][j] = matrix[j][i];
                matrix[j][i] = temp;
            }
        
        /*再一列一列地换*/
        for(int j = 0; j < n/2; j++)
            for(int i = 0; i < n; i++){
                int temp;
                temp = matrix[i][j];
                matrix[i][j] = matrix[i][n - 1 - j];
                matrix[i][n - 1 -j] = temp;
            }
    }
};