6.10 data structure, a reference stack

#include <stdio.h>
typedef int KeyT;
typedef int ElemType;
typedef struct
{
    KeyT key;
    ElemType data;
}ST;
void Sift(ST R[],int low,int high)         //i=low.n=high 
{
    int i=low,j=2*i;
    ST t=R[i];                            //st与sifyt互相调用 
    while(j<=high)
    {
        if(j<high&&R[j].key<R[j+1].key)
        j++;
        if(t.key<R[j].key)
        {
            R[i]=R[j];
            i=j;
            j=2*i;
        }
        else break;
        
    }
    R[i]=t;
}
void HS(ST R[],int n)
{
    int i; 
        ST t;
        for(i=n/2;i>=1;i--)
        Sift(R,i,n);
        for(i=n;i>=2;i--)
        {
            t=R[1];
            R[1]=R[i];R[i]=t;
            Sift(R,1,i-1);
        }
}
int main()
{
    ST R[100];
    KeyT A[]={75,87,68,92,88,61,77,96,80,72};
    int i,n=10;
    for(i=0;i<n;i++)
    R[i+1].key=A[i];
    HS(R,n);
    printf("排序结果：");
    for(i=1;i<=n;i++)
    printf("%3d",R[i].key);
    printf("\n");
}