堆排序(C++实现)

#include<iostream>
#include<vector>

using namespace std;

void swap(vector<int> &arr, int a, int b)
{
    int temp = arr[a];
    arr[a] = arr[b];
    arr[b] = temp;
}

void ajust_heap(vector<int>&arr, int hole, int len)
{
    int Rchild;
    Rchild = 2*hole+2;
    while(Rchild<len)
    {
        if(arr[Rchild]<arr[Rchild-1])
            Rchild--;
        if(arr[Rchild]>arr[hole])
			{swap(arr, Rchild, hole);
			hole = Rchild;
			Rchild = 2*hole+2;}
		else
			break;
    }
    if(Rchild==len&&arr[Rchild-1]>arr[hole])
        swap(arr, hole, Rchild-1);
    }

void build_heap(vector<int> &arr)
{
    int size = arr.size();
    for(int hole=size/2-1; hole>=0; hole--)
    {
        ajust_heap(arr, hole, size);
    }
}

void heapSort(vector<int>& arr)
{
    int len = arr.size();
    for(int i=len-1; i>=0; i--)
    {
        cout<<arr[0]<<" ";
        arr[0] = arr[i];
        ajust_heap(arr, 0, i);
    }
}
int main()
{
    int a[] = {2,1,4,6,7,6,5,3,3,4,8};
    vector<int> arr(a, a+sizeof(a)/sizeof(int));
    build_heap(arr);
    heapSort(arr);
    return 0;
}