卡时（系统时间）

#define timer std::chrono::_V2::system_clock::time_point
class Timers
{
  public:
	timer start = chrono::high_resolution_clock::now();
	void Start()
	{
		start = chrono::high_resolution_clock::now();
	}
	//1s数据：hzoi:1450；Luogu:978
	unsigned long long GetEnd()
	{
		timer stop = chrono::high_resolution_clock::now();
		unsigned long long spend = chrono::duration_cast<std::chrono::milliseconds>(stop - start).count();
		return spend;
	}
} Timer;

signed main()
{
	Timer.Start();
	int n;
	cin >> n;
	while (Timer.GetEnd() <= 980) {}
	cout << "Hello,World!";
	return 0;
}