//Heap sort

#include <iostream.h>
#include <conio.h>

class heap
{
int k[11],size;
public:
void getdata(void);
friend void create_heap(heap &);
friend void sort_heap(heap &);
void showdata(void);
};

void heap :: getdata(void)
{
clrscr();
cout<<"Enter the size of Array :-";
cin>>size;
cout<<"\nEnter "<<size<<" Elements\n";
 for(int i=1;i<=size;i++) //Creating heap from  index1 instead of index0
   cin>>k[i];
}

void heap :: showdata(void)
{
  clrscr();
  cout<<"\n\nHeap Function Output\n\n";
  for(int i=1;i<=size;i++)
    cout<<k[i]<<endl;
}


void create_heap(heap &a)
{
int q,i,j,key;
  for(q=2;q<=a.size;q++)
  {
    i=q;
    key=a.k[i];
    j=i/2;
    while(i>1 && key>a.k[j])
      {
         a.k[i]=a.k[j];
         i=j;
         j=i/2;
         if(j<1)
            j=1;
      }
    a.k[i]=key;
    }
}

void sort_heap(heap &a)
{
int q,i,j,key,temp;
  for(q=a.size;q>=1;q--)
  {
     temp=a.k[1];
     a.k[1]=a.k[q];
     a.k[q]=temp;
     i=1;
     key=a.k[i];
     j=2*i;
     if(j+1 < q)
     {
         if(a.k[j+1] > a.k[j])
            j++;
        }
     while(j<=q-1 && key<a.k[j])
     {
       a.k[i]=a.k[j];
       i=j;
       j=2*i;
       if(j+1 < q)
       {
          if(a.k[j+1] > a.k[j])
             j++;
       }
       elsebreak;
     }
     a.k[i]=key;
    }
}

void main()
{
heap o1;
o1.getdata();
create_heap(o1);
sort_heap(o1);
o1.showdata();
getch();
}