Vector

#include <iostream>
using namespace std;
#include <vector>
using std::vector;
vector<int> ivec;
void out1(){
	for(vector<int>::iterator it=ivec.begin();it!=ivec.end();it++)
		cout<<*it<<" "; 
	cout<<endl;
}

int main(){	
	cout<<"size:"<<ivec.size()<<endl;
	int pos,i,value;
	int n;
	ivec.reserve(cin>>n);
	cout<<"size:"<<ivec.size()<<endl;

//	for(i=0;i<5;i++)
//		cin>>ivec[i];
//	out1();
	return 0;
}