堆排序的C++实现

#include "stdafx.h"
#include <iostream>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
    void HeapSort(int* pp,int l);
    void DisplayHeap(int* pp,int l);
    int len;
    cout<<"Please input the array length:"<<endl;
    cin>>len;
    int* p=new int[len+1];//heap array
    cout<<"Please input the element datas:"<<endl;
    int d;
    p[0]=0;//used for temp element
    for(int i=1;i<=len;i++)
    {
        cin>>d;
        p[i]=d;//initate the heap
    }
    DisplayHeap(p,len);
    HeapSort(p,len);//sort begin
    DisplayHeap(p,len);
    cout<<"Please input a new num:"<<endl;
    int nd;
    cin>>nd;
    int* pp=new int[len+2];
    pp[len+1]=nd;
    for(int i=0;i<=len;i++)
    {
        pp[i]=p[i];
    }
    DisplayHeap(pp,len+1);
    HeapSort(pp,len+1);//sort begin
    DisplayHeap(pp,len+1);
    system("pause");
    return 0;
}
//sort function
void HeapSort(int* p,int len)
{
    int j;
    for(int i=len;i>1;i--)
    {
            if(p[i/2]<p[i]){
            p[0]=p[i];
            p[i]=p[i/2];
            p[i/2]=p[0];
            } 
    }    
    p[0]=p[1];
    p[1]=p[len];
    p[len]=p[0];
    len--;
    if(len>2){ 
        HeapSort(p,len);//1~(n-1) heap sort
    }
}
//output
void DisplayHeap(int* p,int len)
{
    cout<<"Now the heap is:"<<endl;
    for(int i=1;i<=len;i++)
    {
        cout<<p[i];
        if(i<len)
        {
            cout<<"--";
        }
    }
    cout<<"\n";
}