#include <cstdio>
#include <vector>
#include <iostream>
using namespace std;

int main() {
    int a1=100, b1=200, c1=300, fd[10]={1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
	vector<int> v(2, 0);
	vector<int>::iterator b, e;
    for(b=v.begin(), e=v.end(); b!=e; b++) {
		printf("%d ",*b);
        cout<< *b <<endl;
    }
    v.erase(v.begin(), v.end());
    for(int i=0; i<10; i++) v.push_back(fd[i]);
    for(b=v.begin(), e=v.end(); b!=e; b++) {
		printf("%d ",*b);
        cout<<*b<<endl;
    }
    for(int i=0; i<10; i++) cout<<fd[i]<<endl;
    double q, w, r;
    scanf("%lf%lf", &q, &w);
    printf("%.5lf\n", q+w);
    cin>>q>>w;
    cout<<q+w<<endl;
    return 0;
}
