#include <iostream>
#include <string>
#include <vector>

using namespace std;

static_assert(sizeof(char32_t) == sizeof(int), "No valid string exists");
typedef u32string Vector;

int main() {
	const vector<int> first = {13};
	const vector<int> second = {42};
	const Vector concatenation = Vector(first.cbegin(), first.cend()) + Vector(second.cbegin(), second.cend());

	for(auto& i : concatenation) {
		cout << i << endl;
	}
}