static double TestHeap(int[] arr, bool IsHeapify)
{
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
MaxHeap <int> heap;
if (IsHeapify)
{
heap = new MaxHeap <int>(arr);
}
else
{
heap = new MaxHeap <int>();
for (int i = 0; i < arr.Length; i++)
{
heap.Add(arr[i]);
}
}
//sort
List <int> list = new List <int>();
for (int i = 0; i < heap.GetSize(); i++)
{
list.Add(heap.ExtractMax());
}
for (int i = 0; i < list.Count - 1; i++)
{
if (list[i] < list[i + 1])
{
throw new Exception("Error");
}
}
Console.WriteLine("Success.");
stopWatch.Stop();
return((double)stopWatch.ElapsedMilliseconds / 1000.000);
}
public PriorityQueue()
{
maxHeap = new MaxHeap <T>();
}
static void Main(string[] args)
{
int[] nums = new int[] { 1, 1, 1, 2, 2, 3 };
int[] arrs = new int[] { 15, 17, 19, 13, 22, 16, 28, 30, 41, 62 };
//TopKFrequent(nums, 2);
IndexMinHeap <int> heap2 = new IndexMinHeap <int>(nums.Length);
for (int i = 0; i < nums.Length; i++)
{
heap2.Add(i, nums[i]);
}
List <int> list3 = new List <int>();
for (int i = 0; i < nums.Length; i++)
{
list3.Add(heap2.ExtractMin());
}
int n = 100000;//arrs.Length;
MaxHeap <int> heap = new MaxHeap <int>();
Random rand = new Random();
MaxIndexHeap <int> inxHeap = new MaxIndexHeap <int>();
for (int i = 0; i < n; i++)
{
int a = rand.Next(int.MaxValue);
heap.Add(a);
inxHeap.Add(i, a);
}
List <int> list = new List <int>();
List <int> list2 = new List <int>();
for (int i = 0; i < n; i++)
{
list.Add(heap.ExtractMax());
list2.Add(inxHeap.ExtractMax());
}
for (int i = 0; i < n - 1; i++)
{
if (list[i] < list[i + 1])
{
throw new Exception("Error");
}
if (list2[i] < list2[i + 1])
{
throw new Exception("Error");
}
}
Console.WriteLine("Success.");
int[] arr = new int[n];
for (int i = 0; i < n; i++)
{
arr[i] = rand.Next(int.MaxValue);
}
double time1 = TestHeap(arr, true);
double time2 = TestHeap(arr, false);
Console.WriteLine("with heapify: " + time1 + "s");
Console.WriteLine("without heapify: " + time2 + "s");
}