Usage when saving pointers in std::vector

#include "pch.h"

#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <numeric>
#include <unordered_set>
using namespace std;

struct ListNode {
    
	int num;
	int score;
	ListNode* next;

	ListNode() : num(0), score(0), next(NULL) {
    }

	ListNode(int numV,int scoreV, ListNode* pNext)
	{
    
		num = numV;
		score = scoreV;
		next = pNext;
	}

	ListNode& operator = (const ListNode& pNode)
	{
    
		num = pNode.num;
		score = pNode.score;
		next = pNode.next;
	}

	/*bool operator == (const ListNode& pNode) { }*/
};

int main()
{
    
	// 定义一个指针数组vector
	vector<ListNode*> vecList;

	ListNode* pHead = new ListNode(1001, 89, NULL);
	vecList.push_back(pHead);

	ListNode* pNode1 = new ListNode(1002, 78, NULL);
	vecList.push_back(pNode1);

	ListNode* pNode2 = new ListNode(1003, 94, NULL);
	vecList.push_back(pNode2);

	for (auto itor = vecList.begin(); itor != vecList.end(); ++itor)
	{
    
		if (*itor)
		{
    
			cout << (*itor)->num << " " << (*itor)->score << endl;
		}
	}

	// 手动删除vecpointer contents in 
	delete pHead; pHead = nullptr;
	delete pNode1; pNode1 = nullptr;
	delete pNode2; pNode2 = nullptr;

	//vecList.clear();

	// check this timevecpointer contents in 
	cout << vecList.size() << endl;
	for (auto itor = vecList.begin(); itor != vecList.end(); ++itor)
	{
    
		if (*itor)
		{
    
			cout << (*itor)->num << " " << (*itor)->score << endl;
		}
	}

	return 0;
}