堆排序 C++实现

#include
using namespace std;


void adjust(vector& a, int i, int n)
{
	int left = i * 2 + 1;
	int right = i * 2 + 2;
	int max = i;
	if (left < n && a[left]>a[max])
		max = left;
	if (right < n && a[right]>a[max])
		max = right;

	if (max != i)
	{
		swap(a[max], a[i]);
		adjust(a, max, n);
	}
	return;
}

void duipaixu(vector& a, int n)
{
	for (int i = (n - 1) / 2; i > 0; i--)
	{
		adjust(a, i, n);
	}
	
	for (int i = 0; i < n; i++)
	{
		swap(a[i], a[n - i]);
		adjust(a, i, n - 1 - i);
	}
	return;
}

int main()
{
	int n;
	cin >> n;
	vectora(n);
	for (int i = 0; i < n; i++)
		cin >> a[i];
	sort(a.begin(),a.end());
	for (auto c : a)
		cout << c << " ";
	cout << endl;
	return 0;
}

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