(leetcode)Rotate Image

 1 class Solution {
 2 public:
 3     void rotate(vector<vector<int>>& matrix) {
 4         int n = matrix.size();
 5         int temp;
 6         for(int i = 0;i < n;++i)
 7         {
 8             for(int j = 0;j < n-i;++j)
 9             {
10                 temp = matrix[i][j];
11                 matrix[i][j] = matrix[n-j-1][n-i-1];
12                 matrix[n-j-1][n-i-1] = temp;
13             }
14         }
15         
16         for(int i = 0; i < n/2; ++i)//沿着水平线翻转
17         {
18             for(int j = 0;j < n;++j)
19             {
20                 temp = matrix[i][j];
21                 matrix[i][j] = matrix[n-i-1][j];
22                 matrix[n-i-1][j] = temp;
23             }
24         }
25     }
26 };