#include <iostream>
#include <cassert>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
bool result;
string s("abcde");
string s2("aeiou");
vector<char> vector1(s.begin(), s.end());
vector<char> vector2(s2.begin(), s2.end());
vector<char> setIntersection;
set_intersection(vector1.begin(), vector1.end(),vector2.begin(), vector2.end(),back_inserter(setIntersection));
for(int i=0;i<setIntersection.size();i++){
cout << setIntersection[i];
}
return 0;
}
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