intersection between vector c 2b 2b

1#include <algorithm> //std::sort
2#include <iostream> //std::cout
3#include <string> //std::string
4#include <vector> //std::vector
5
6std::vector<std::string> intersection(std::vector<std::string> &v1,
7                                      std::vector<std::string> &v2){
8    std::vector<std::string> v3;
9
10    std::sort(v1.begin(), v1.end());
11    std::sort(v2.begin(), v2.end());
12
13    std::set_intersection(v1.begin(),v1.end(),
14                          v2.begin(),v2.end(),
15                          back_inserter(v3));
16    return v3;
17}
18
19int main(){
20    std::vector<std::string> v1 {"a","b","c"};
21    std::vector<std::string> v2 {"b","c"};
22
23    auto v3 = intersection(v1, v2);
24
25    for(std::string n : v3)
26        std::cout << n << ' ';
27}