#include<iostream>
using namespace std;
void heapsort(int *a, size_t size);
void buildheap(int *a, size_t size);
void maxheapify(int *a, size_t n,size_t i);
int main()
{
int a[11] = { -1,4,1,3,2,16,9,10,14,8,7 };
heapsort(a, 10);
for (size_t i = 1; i < 11; ++i)
cout << a[i] << " ";
cout << endl;
return 0;
}
void heapsort(int *a, size_t size)
{
buildheap(a, size);
for (size_t i = size ; i >1; --i)
{
std::swap(a[1], a[i]);
--size;
maxheapify(a, size,1);
}
}
void buildheap(int *a, size_t size)
{
size_t n = size;
for (size_t i = n / 2 ; i >0; --i)
maxheapify(a, n,i);
}
void maxheapify(int *a, size_t n,size_t i)
{
size_t le = 2 * i , ri = 2 * i + 1;
size_t large = i;
if (le<=n&&a[large] < a[le])
large = le;
if (ri<=n&&a[large] < a[ri])
large = ri;
if (large != i)
{
std::swap(a[large], a[i]);
maxheapify(a, n, large);
}
}