I just wrote a binary tree to test the usage of _CrtDumpMemoryLeaks. The code is as follows. I tracked the breakpoints and found that all the nodes have been deleted, but there is still a prompt in the output window

#include "stdafx.h"
#include <iostream>
#include <string>
#include <crtdbg.h>
class Node
{
public:
    int data;
    Node *lchild;
    Node *rchild;
    Node(int d) : data{ d }, lchild{ NULL }, rchild{ NULL } {}
};
class tree
{
public:
    Node *root;
    tree() : root{ NULL } {}
    void build()
    {
        root = new Node(5);
        root->lchild = new Node(6);
        root->rchild = new Node(7);
        root->lchild->lchild = new Node(8);
        root->lchild->rchild = new Node(9);
        in(root);
    }
    void remove(Node *node)
    {
        if (node->lchild != NULL)
        {
            remove(node->lchild);
        }
        if (node->rchild != NULL)
        {
            remove(node->rchild);
        }
        delete node;
    }
    void in(Node *node)
    {
        if (node->lchild != NULL)
        {
            preorder(node->lchild);
        }
        std::cout << node->data << " ";
        if (node->rchild != NULL)
        {
            preorder(node->rchild);
        }
    }
    ~tree()
    {
        remove(root);
    }
    void convert(std::string &pre, std::string &in)
    {

    }
};
int main()
{
    tree t;
    t.build();
    _CrtDumpMemoryLeaks();
    return 0;
}

I have two questions to ask you here:

1. Where is the memory leak in this simple code

2. How to figure out the location of your own memory leak from the prompt information given by _CrtDumpMemoryLeaks, what basic knowledge do you need? To be more specific, the address## given by _CrtDumpMemoryLeaks How to quickly find #0x02EE2880 etc. from the code? After all, if you write more, you definitely can’t find it manually. And 09 00 00 00 00....What does stand for?