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;}