#include <iostream>
#include <vector>
#include <tuple>
 
int main() {
    std::vector<int> v1{ 1, 2, 3 };
    std::vector<int> v2{ 4, 5 };
 
    auto p = v1.size() < v2.size() ? std::tie( v1, v2 ) : std::tie( v2, v1 );
    std::vector<int> r( std::get<1>( p ) );
    for( size_t i = 0; i != std::get<0>( p ).size(); ++i )
        r[i] += std::get<0>( p )[i];
 
    for( int i : r )
        std::cout << i << ",";
    std::cout << std::endl;
}

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