Example
public class HeapSort
{
public static void Heapify(int[] input, int n, int i)
{
int largest = i;
int l = i + 1;
int r = i + 2;
if (l < n && input[l] > input[largest])
largest = l;
if (r < n && input[r] > input[largest])
largest = r;
if (largest != i)
{
var temp = input[i];
input[i] = input[largest];
input[largest] = temp;
Heapify(input, n, largest);
}
}
public static void SortHeap(int[] input, int n)
{
for (var i = n - 1; i >= 0; i--)
{
Heapify(input, n, i);
}
for (int j = n - 1; j >= 0; j--)
{
var temp = input[0];
input[0] = input[j];
input[j] = temp;
Heapify(input, j, 0);
}
}
public static int[] Main(int[] input)
{
SortHeap(input, input.Length);
return input;
}
}
