请问这样会造成内存泄漏吗？

[院里有座山]

#include <iostream>
#include <cstdlib>
#include <ctime>

using std::cin;
using std::cout;
using std::endl;
using std::string;

class Grand
{
private:
	int hold;
public:
	Grand(int h = 0) :hold(h) {}
	virtual void Speak()const { cout << "I am a grand class!\n"; }
	virtual int Value()const { return hold; }
};

class Superb :public Grand
{
public:
	Superb(int h = 0) :Grand(h) {}
	void Speak()const { cout << "I am a superb class!!\n"; }
	virtual void Say()const { cout << "I hold the superb value of " << Value() << "!\n"; }
};

class Magnificent :public Superb
{
private:
	char ch;
public:
	Magnificent(int h = 0, char c = 'A') :Superb(h), ch(c) {}
	void Speak()const { cout << "I am a magnificent class!!!\n"; }
	void Say()const { cout << "I hold the character " << ch << " and the integer " << Value() << "!\n"; }
};

Grand* GetOne();

int main()
{
	srand(time(0));
	Grand* pg;
	Superb* ps;
	for (int i = 0; i < 5; i++)
	{
		pg = GetOne();
		pg->Speak();
		if (ps = dynamic_cast<Superb*>(pg))ps->Say();
	}
	cout << "Bye.\n";
	return 0;
}

Grand* GetOne()
{
	Grand* p;
	switch (rand() % 3)
	{
	case 0:
		p = new Grand(rand() % 100);
		break;
	case 1:
		p = new Superb(rand() % 100);
		break;
	case 2:
		p = new Magnificent(rand() % 100, 'A' + rand() % 26);
		break;
	}
	return p;
}

GetOne函数里new内存，需要释放吗？

[真相重于对错]

凡事new 出来的必须 delete 回去

[Keven_11]

new的内存要释放

[赵4老师]

50行前加一句 delete pg;

[forever74]

你起床要刷牙么？ new出来的要释放么？ 原则上要。 就今天一天来说，你着急没空刷牙，天也不会塌。你之后总有机会补刷的。 就这个代码来说，你不释放，系统也不会崩溃。程序结束了资源自然就回收了。