旋转图像\

输入：matrix = [[1,2,3],[4,5,6],[7,8,9]]
输出：[[7,4,1],[8,5,2],[9,6,3]]

输入：matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]]
输出：[[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]]

class Solution {

public:

    void rotate(vector<vector<int>>& matrix) {

        int n = matrix.size();

        // 先转置

        for (int i = 0; i < n; i++) {

            for (int j = i + 1; j < n; j++) {

                swap(matrix[i][j], matrix[j][i]);

            }

        }

        // 再左右镜像对称

        for (int i = 0; i < n; i++) {

            for (int j = 0; j < n / 2; j++) {

                swap(matrix[i][j], matrix[i][n - j - 1]);

            }

        }



    }

};