Problem:
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Maximum Heap

A binary heap which satisfies max-heap property is called max-heap. In a max-heap, for every node $i$ other than the root, $A[i] \leq A[parent(i)]$, that is, the value of a node is at most the value of its parent. The largest element in a max-heap is stored at the root, and the subtree rooted at a node contains values no larger than that contained at the node itself.

Here is an example of a max-heap.

Write a program which reads an array and constructs a max-heap from the array based on the following pseudo code.

$maxHeapify(A, i)$ move the value of $A[i]$ down to leaves to make a sub-tree of node $i$ a max-heap. Here, $H$ is the size of the heap.

1 maxHeapify(A, i)
2 l = left(i)
3 r = right(i)
4 // select the node which has the maximum value
5 if l ≤ H and A[l] > A[i]
6 largest = l
7 else
8 largest = i
9 if r ≤ H and A[r] > A[largest]
10 largest = r
11
12 if largest ≠ i　// value of children is larger than that of i
13 swap A[i] and A[largest]
14 maxHeapify(A, largest) // call recursively

The following procedure buildMaxHeap(A) makes $A$ a max-heap by performing maxHeapify in a bottom-up manner.

1 buildMaxHeap(A)
2 for i = H/2 downto 1
3 maxHeapify(A, i)

Input

In the first line, an integer $H$ is given. In the second line, $H$ integers which represent elements in the binary heap are given in order of node id (from $1$ to $H$).

Output

Print values of nodes in the max-heap in order of their id (from $1$ to $H$). Print a single space character before each value.

Constraint

$1 \leq H \leq 500,000$

$-2,000,000,000 \leq$ value of a node $\leq 2,000,000,000$

Sample Input 1

10
4 1 3 2 16 9 10 14 8 7

Sample Output 1

16 14 10 8 7 9 3 2 4 1

Reference

Introduction to Algorithms, Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein. The MIT Press.

Solution in C (judge verdict: Accepted)

#include<stdio.h>
#include<math.h>
#define N 500000
void maxHeapify(int *,int,int);
//void builtMaxHeap(int *,int,int);
int main()
{
  int i,A[N+1],n,a;
  scanf("%d",&n);
  for(i=1;i<=n;i++)
    {
      scanf("%d",&A[i]);
    }
  a=n/2;
   for(i=a;i>=1;i--)
    {
     
      maxHeapify(A,i,n);
    }
   for(i=1;i<=n;i++)
     {
       printf(" %d",A[i]);
     }
   printf("\n");
   return 0;
}

void maxHeapify(int A[],int i,int n)
{
  int b,c,l,r,largest;
  l = 2*i;
  r = 2*i+1;
  if(l<=n && A[l] >A[i])largest = l;
  else largest = i;
  if( r <= n && A[r] > A[largest] )largest = r;
  if(largest !=i)
    {
      b = A[i];
      c = A[largest];
      A[largest] = b;
      A[i] = c;
      
      maxHeapify(A,largest,n);
    }
}

/*void builtMaxHeap(int A[],int a,int n)
{
  int i;
  for(i=a;i>1;i--)
    {
      maxHeapify(A,i,n);
    }
}
*/