void populateHeap(Heap *h, int *buf, int n)
{
	if(h == NULL || buf == NULL || n ==0) 
		return;
	
	while(n > h->capacity)
		resize(h);
	
	int i = 0;
	for( i = 0; i < n; i++)
		h->vec[i] = buf[i];
	h->size = n;
	
	for(i = (n-1)/2; i >= 0; i--)
		heapify(h, i);
		
}