c++(數據類型 && set插入重復數據)

	set<int> s1;
	auto ret = s1.insert(10);
	if (ret.second) 
		cout << "插入成功" << endl;
	else
		cout << "插入失敗" << endl;
	auto ret2 = s1.insert(10);
	if (ret2.second)
		cout << "插入成功" << endl;
	else
		cout << "插入失敗" << endl;