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

void recurse(){
    recurse();
}

int main(){
    vector<int> A,B,C;
    A.push_back(1); B.push_back(1);
    vector<int>::iterator ite=set_intersection(A.begin(),A.end(),B.begin(),B.end(),C.begin());
}