hi i have question here is pseudo code about sift up and sift down on heaps

Posted by davit-datuashvili on Stack Overflow See other posts from Stack Overflow or by davit-datuashvili
Published on 2010-05-24T10:51:49Z Indexed on 2010/05/24 11:11 UTC
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algorithm

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homework

i have following pseudo code :

void siftup(int n)
 pre condition n>0  && heap(1,n-1)
post heap(1,n)
 i=n;
 loop
/* invariant: heap(1,n)   except  perhaps 
  between    i and   its parent 
 if (i==1)
   break;
 p=i/2;
 if (x[p]<=x[i])
   break;
 swap(p,i);
i=p;

please help me to write it in real code i have question about loop for example where is starting point of loop?

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