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?

#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;

//先求转置.
void rotate(vector<vector<int> > &matrix) {

	for (int i = 0; i != matrix.size();++i){
		for (int j = i+1; j != matrix[0].size();++j)
		{
			swap(matrix[i][j], matrix[j][i]);
		}
		reverse(matrix[i].begin(), matrix[i].end());
	}

}

Rotate Image

原文：http://blog.csdn.net/li_chihang/article/details/44452255