堆排序

#include<stdio.h>
#define MAX 255

//堆排序学习 
int R[MAX];

void Heapify(int s,int m)
{
	//调整堆 
	int j,temp;
	temp=R[s];
	j=2*s;
	while(j<=m)
	{
		if(j<m&&R[j]>R[j+1]) j++;
		if(temp<R[j]) break;
		R[s]=R[j];
		s=j;
		j=j*2;
	}
	R[s]=temp;
	
}

void BuildHeap(int n)
{
	//初始建堆
	int i;
	for(i=n/2;i>0;i--)
	Heapify(i,n);
	 
}

void Heap_sort(int n)
{
	//堆排序 
	int i;
	BuildHeap(n);
	for(i=n;i>1;i--)
	{
		R[0]=R[1];R[1]=R[i];R[i]=R[0];
		Heapify(1,i-1);
	}

}

int main()
{
	//测试函数
	 printf("堆排序示例：
");
	 int n,i;
	 printf("Please input the number under %d
",MAX);
	 scanf("%d",&n);
	 if(n>MAX)
	 {
	 	printf("The number is not right!
");
	 	return 0;
	 }
	 printf("Please input the array one by one:
");
	 for(i=1;i<=n;i++)
	 {
	 	scanf("%d",&R[i]);
	 }
	printf("The array you input is:
");
	for(i=1;i<=n;i++)
	{
		printf("%d ",R[i]);
	}	 
	printf("The array after Heap_sort is:
");
	Heap_sort(n);
	for(i=1;i<=n;i++)
	{
		printf("%d ",R[i]);
	}
		 
	 return 0;
}