#include <iostream>
#include <cmath>
#include <vector>

void f(vector<double> &x, vector<double> y)
{
  for(size_t i=0;i<x.size();++i)
    y.push_back(x[i]);

  for(size_t i=0;i<x.size();++i)
    x.pop_back();
}

int main()
{
  vector<double> a(3); 
  vector<double> b(3);
  
  for(size_t i=0;i<a.size();++i)
    a[i] = static_cast<double>(i);

  for(size_t i=0;i<b.size();++i)
    b[i] = 2.0*static_cast<double>(i);

  f(a,b);

  cout << a.size() << endl;
  cout << b.size() << endl;
  
  return 0;
}