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)

using System;
using System.Linq;
using System.Text;

namespace Heaps
{
    class Maximum_Heap
    {
        static void MaxHeapify(int[] A, int index)
        {
            var r = index << 1;
            var l = r - 1;
            index--;
            var largest = 0;
            if (l < A.Length && A[l] > A[index]) largest = l;
            else largest = index;
            if (r < A.Length && A[r] > A[largest]) largest = r;

            if (largest != index)
            {
                var temp = A[index];
                A[index] = A[largest];
                A[largest] = temp;
                MaxHeapify(A, largest+1);
            }
        }

        static void BuildMaxHeap(int[] A)
        {
            for (int i = A.Length / 2; i > 0; i--)
                MaxHeapify(A, i);
        }

        static void Main(string[] args)
        {
            Console.ReadLine();
            var A = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();

            BuildMaxHeap(A);
            var str = new StringBuilder();
            for (int i = 0; i < A.Length; i++)
            {
                str.Append(" ").Append(A[i]);
            }
            Console.WriteLine(str.ToString());
        }
    }
}