【leetcode】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?

 

class Solution {
public:
    void rotate(vector<vector<int> > &matrix) {
        int n=matrix.size();
        vector<vector<int> > tmp(n,vector<int> (n));

        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
                tmp[j][n-1-i]=matrix[i][j];
        }

        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
                cout<<tmp[i][j]<<" ";
            cout<<endl;
        }
    }
};