#include<vector>
#include<iostream>
#include<initializer_list>
using namespace std;
int main(void){
    vector<int> nn={0,1,2,3,4};
	for(int i=0; i<10; i++){
		int& n(nn[i]); // this is just to save typing, and is not used if invalid
		if(i<nn.size()) cout<<n<<endl;
	}
};