class genRandomVectorinRange {
private:
	int range;
public:
	genRandomVectorinRange(int d) : range(d) {}
	int operator()(int x) {
		int ve = (int)std::rand%range;
		return  ve;
	}
};

int main() {

	std::vector<int> vec(20);

	int t = 5;

	std::generate(vec.begin(), vec.end(), genRandomVectorinRange(t));

	for (auto x : vec) {
		std::cout << x << "\n";
	}