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

vector<int> concatenacio(const vector<int>& v1, const vector<int>& v2) {
    int n1 = v1.size();
    int n2 = v2.size();
    vector <int> v(n1 + n2);
    for (int i = 0; i < n1; ++i) {
        v[i] = v1[i];
    }
    int j = n1;
    for (int i = 0; i < n2; ++i) {
        v[j] = v2[i];
        ++j;
    }
    return v;
}