/// <summary>
/// Gets the median based on the current elements in the stream
/// </summary>
/// <returns>median of the stream</returns>
public double GetMedian()
{
if ((MinHeapInst.HeapSize + MaxHeapInst.HeapSize) % 2 != 0)
{
// odd number of elements in the stream
return(MaxHeapInst.PeekMax());
}
// even number of elements in the stream
int mid1 = MaxHeapInst.PeekMax();
int mid2 = MinHeapInst.PeekMin();
return(mid1 + ((mid2 - mid1) / 2.0)); // This will prevent overflow
}
/// <summary>
/// Insert a value to the stream
/// </summary>
/// <param name="val"></param>
public void Insert(int val)
{
if (MaxHeapInst.HeapSize == 0)
{
MaxHeapInst.Insert(val);
return;
}
if (MaxHeapInst.PeekMax() > val) // The val needs to go in MaxHeap
{
if (MaxHeapInst.HeapSize > MinHeapInst.HeapSize) // Make sure MaxHeap.Count does not go beyond MinHeap.Count + 1
{
MinHeapInst.Insert(MaxHeapInst.ExtractMax());
}
MaxHeapInst.Insert(val);
}
else // The val needs to go in MinHeap
{
if (MinHeapInst.HeapSize == MaxHeapInst.HeapSize) // Make sure that the MinHeap.Count does not go beyond MaxHeap.Count
{
MaxHeapInst.Insert(MinHeapInst.ExtractMin());
}
MinHeapInst.Insert(val);
}
}
