Rotate image <leetcode>

You are givenNXN2D matrix representing an image.

Rotate the image by 90 degrees (clockwise ).

Follow up:
Cocould you do this in-place?

 

Train of Thought: First Flip left and right, and then flip right diagonal lines in the lower left corner. The Code is as follows:

 

 1 class Solution { 2 public: 3     void rotate(vector<vector<int> > &matrix) { 4         int n=matrix.size(); 5         if(n==1)  return; 6         for(int i=0;i<n;i++) 7         { 8             for(int j=0;j<n/2;j++) 9             {10                 swap(matrix[i][j],matrix[i][n-j-1]);11                 12             }13         }14         for(int i=0;i<n;i++)15         {16             for(int j=0;j<n-i;j++)17             {18                 swap(matrix[i][j],matrix[n-j-1][n-i-1]);19             }20         }21     }22 };

 

Rotate image <leetcode>