pop_heap() in C++ - Sanfoundry

This C++ program pops element from heap using pop_heap algorithm. The pop_heap operation swaps the element at first position and the last position and makes the subrange [first, last – 1) into a max-heap. The element at the last position is actually popped from the container.

Here is the source code of the C++ program which pops element from heap using pop_heap algorithm. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to pop largest element from heap using pop_heap() operation

```
 */
```
```
#include <iostream>
```
```
#include <vector>
```
```
#include <algorithm>
```
```
#include <functional>
```
```
 
```
```
void print(const std::vector <int>& v)
```
```
{
```

    std::vector <int>::const_iterator i;

    for(i = v.begin(); i != v.end(); i++)

```
    {
```
```
        std::cout << *i << " ";
```
```
    }
```
```
    std::cout << std::endl;
```
```
}
```
```
 
```
```
int main()
```
```
{
```
```
    int arr[] = {1, 5, 3, 4, 1, 6};
```

    std::vector<int> v(arr, arr + sizeof(arr)/sizeof(int));

```
    int largest;
```
```
 
```
```
    std::cout << "vector v : ";
```
```
    print(v);
```

    // default make_heap creates max-heap

```
    std::make_heap(v.begin(), v.end());
```
```
    std::cout << "Heap : ";
```
```
    print(v);
```

    // moves the largest element to the end of heap

```
    pop_heap(v.begin(), v.end());
```
```
    largest = v.back();
```

    std::cout << "Largest Element : " << largest << std::endl;

    v.pop_back(); // removes the largest element

```
    std::cout << "Heap : ";
```
```
    print(v);
```
```
}
```

$ a.out
vector v : 1 5 3 4 1 6 
Heap : 6 5 3 4 1 1 
Largest Element : 6
Heap : 5 4 3 1 1

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