#include <stdio.h>
#include <vector>
 
int value[1234][1234],value2[1234][1234];
void rotate(int x0, int y0, int w, int h)
{
	// (x0,y0) ~ (x0,y0+h)
	// (x0,y0+h) ~ (x0+w,y0+h)
	// (x0+w,y0+h) ~ (x0+w,y0)
	// (x0+w,y0) ~ (x0,y0)
 
	std::vector< std::pair<int,int> > temp;
	for(int i=0;i<h;i++) temp.push_back(std::make_pair(x0,y0+i));
	for(int i=0;i<w;i++) temp.push_back(std::make_pair(x0+i,y0+h));
	for(int i=0;i<h;i++) temp.push_back(std::make_pair(x0+w,y0+h-i));
	for(int i=0;i<w;i++) temp.push_back(std::make_pair(x0+w-i,y0));
 
	//rotate
	for(int i=0;i<temp.size();i++) value2[temp[(i+1)%temp.size()].first][temp[(i+1)%temp.size()].second] = value[temp[i].first][temp[i].second];
	for(int i=0;i<temp.size();i++) value[temp[i].first][temp[i].second] = value2[temp[i].first][temp[i].second];
}
 
int main()
{
	rotate(1,2,3,4);
}

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