解一个复杂编程题问题

#include <windows.h>
#include <iostream>
using namespace std;

class Staff
{
    friend class Staffs;
public:
    Staff(LPSTR id, LPSTR name, Staff *next=NULL);
    ~Staff();
private:
    LPSTR ID;
    LPSTR Name;
    Staff *Next;   
};

Staff::Staff(LPSTR id, LPSTR name, Staff *next)
{
    HANDLE heapHandle;
    //获取进程堆句柄
    heapHandle = GetProcessHeap();
    if (NULL == heapHandle)
    {
        cout << "GetProcessHeap failed!" << endl;
        ExitProcess(0);
    }
    //初始化ID
    ID = (LPSTR) HeapAlloc (heapHandle, HEAP_ZERO_MEMORY, lstrlen(id)+1);
    CopyMemory(ID, id, lstrlen(id));
    //初始化Name
    Name = (LPSTR) HeapAlloc (heapHandle, HEAP_ZERO_MEMORY, lstrlen(name)+1);
    CopyMemory(Name, name, lstrlen(name));
    //初始化Next
    Next = next;
}
Staff::~Staff()
{
    HANDLE heapHandle;
    //获取进程堆句柄
    heapHandle = GetProcessHeap();
    if (NULL == heapHandle)
    {
        cout << "GetProcessHeap failed!" << endl;
        ExitProcess(0);
    }
    if (!HeapFree(heapHandle, HEAP_NO_SERIALIZE, ID))
    {
        cout << "HeapFree failed" << endl;
        ExitProcess(0);
    }
    if (!HeapFree(heapHandle, HEAP_NO_SERIALIZE, Name))
    {
        cout << "HeapFree failed" << endl;
        ExitProcess(0);
    }
}

class Staffs
{
public:
    Staffs();
    ~Staffs();
    VOID Insert(Staff *node);
    VOID Sort(VOID);
    LPSTR Query(LPSTR id);
    VOID Print(VOID);
private:
    Staff *Head;
};

Staffs::Staffs()
{
    Head = NULL;
}
Staffs::~Staffs()
{
    Staff *temp = Head;

    while (NULL != Head)
    {
        temp = Head;
        Head = Head->Next;
        delete temp;      
    }
    Head = NULL;
}
VOID Staffs::Insert(Staff *node)
{//插入到头部
    node->Next = Head;
    Head = node;
}
VOID Staffs::Sort()
{//
    Staff *temp = NULL, *p = NULL;
    Staff *list = NULL;
    BOOL flag = FALSE;

    while (NULL != Head)
    {
        temp = Head;
        if (temp == NULL || temp->Next == NULL)
        {
            temp->Next = list;
            list = temp;
            break;
        }
        else
        {
           
        }
    }
}
VOID Staffs::Print()
{
    Staff *temp = Head;

    while (temp != NULL)
    {
        cout << "\tID:" << temp->ID << ' '
             << "\tName:" << temp->Name << endl;
        temp = temp->Next;
    }
}
LPSTR Staffs::Query(LPSTR id)
{
    Staff *temp = Head;

    while (temp != NULL)
    {
        if (lstrcmp(id, temp->ID)==0)
        {
            return temp->Name;
        }
        temp = temp->Next;
    }

    return NULL;
}

INT main(VOID)
{
    Staffs staffs;
    Staff *node;
    CHAR NameBuffer[20] = {0};
    CHAR IdBuffer[20] = {0};

    for (SIZE_T sum=0; sum<2; ++sum)
    {
        cout << "ID: " ; cin >> IdBuffer;
        cout << "Name: "; cin >> NameBuffer;
        node = new Staff(IdBuffer, NameBuffer);
        staffs.Insert(node);
    }

    cout << "\t查询ID:1234 " << ' ' << "查询结果: "
         << staffs.Query("1234") << endl;

    staffs.Print();
   
    return 0;
}