Max Heap in C++ - Sanfoundry

This C++ program, displays the maximum heap in which each node of a binary tree is greater than or equal to it’s child nodes.

Here is the source code of the C++ program which takes the values of array as input and returns the elements as they are structured in the maximum heap model. This C++ program is successfully compiled and run on DevCpp, a C++ compiler. The program output is also shown below.

```
/*
```
```
* C++ Program to Implement Max Heap
```
```
 */
```
```
#include <iostream>
```
```
#include <conio.h>
```
```
using namespace std;
```
```
void max_heapify(int *a, int i, int n)
```
```
{
```
```
    int j, temp;
```
```
    temp = a[i];
```
```
    j = 2 * i;
```
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    while (j <= n)
```
```
    {
```
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        if (j < n && a[j+1] > a[j])
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            j = j + 1;
```
```
        if (temp > a[j])
```
```
            break;
```
```
        else if (temp <= a[j])
```
```
        {
```
```
            a[j / 2] = a[j];
```
```
            j = 2 * j;
```
```
        }
```
```
    }
```
```
    a[j/2] = temp;
```
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    return;
```
```
}
```
```
void build_maxheap(int *a,int n)
```
```
{
```
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    int i;
```
```
    for(i = n/2; i >= 1; i--)
```
```
    {
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```
        max_heapify(a,i,n);
```
```
    }
```
```
}
```
```
int main()
```
```
{
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    int n, i, x;
```

    cout<<"enter no of elements of array\n";

```
    cin>>n;
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    int a[20];
```
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    for (i = 1; i <= n; i++)
```
```
    {
```

        cout<<"enter element"<<(i)<<endl;

```
        cin>>a[i];
```
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    }
```
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    build_maxheap(a,n);
```
```
    cout<<"Max Heap\n";
```
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    for (i = 1; i <= n; i++)
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```
    {
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        cout<<a[i]<<endl;
```
```
    }
```
```
    getch();
```
```
}
```

Output
enter no of elements of array
7
enter element1
5
enter element2
9
enter element3
6
enter element4
7
enter element5
1
enter element6
3
enter element7
8
Max Heap
9
7
8
5
1
3
6

Sanfoundry Global Education & Learning Series – 1000 C++ Programs.

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