void main ()
{

	vector<int> vec(10,0);
	
	for(int i=0;i<10;++i)
		vec[i]=i+1;

        int m1=2;
	int m2=6;
	int m3=9;
	vector<int>::iterator iter_m1;
	vector<int>::reverse_iterator iter_m2,iter_m3;

	iter_m1=vec.begin()+m1;
	iter_m2=vec.rend()-m2;
	iter_m3=vec.rend()-m3;

	vec.insert(iter_m1,iter_m2.base(),iter_m3.base());

 	iter_m2=vec.rend()-(2*m3-m2);
	iter_m3=vec.rend()-m3;
 	vec.erase(iter_m3.base(),iter_m2.base());

	for(size_t i=0;i<vec.size();++i)
		cout<<vec[i]<<" ";
}
// current output: 1 2 7 8 9 3 4 5 6 10
// desired output: 1 2 9 8 7 3 4 5 6 10