[leetcode] 48. 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?

解法一：

class Solution {public:    void rotate(vector<vector<int>>& matrix) {        int n = matrix.size();        if(n==0) return;        for(int i=0; i<(n+1)/2; i++)            for(int j=i; j<n-1-i; j++){                int tmp = 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] = matrix[i][j];                matrix[i][j] = tmp;                            }    }};