/// <summary>
/// 4. Median of Two Sorted Arrays
/// <summary>
public double FindMedianSortedArrays(int[] nums1, int[] nums2)
{
var totalLength = nums1.Length + nums2.Length;
if (totalLength == 1)
{
return(nums1.Length > 0 ? nums1[0] : nums2[0]);
}
var sizeDiff = totalLength % 2;
var minHeap = new MinHeap(totalLength + 1);
var maxHeap = new MaxHeap(totalLength + 1);
foreach (var n in nums1)
{
BuildHeap(minHeap, maxHeap, n);
}
foreach (var n in nums2)
{
BuildHeap(minHeap, maxHeap, n);
}
while (maxHeap.Size() != minHeap.Size() + sizeDiff)
{
if (maxHeap.Size() > minHeap.Size() + sizeDiff)
{
minHeap.Offer(maxHeap.Poll());
}
else
{
maxHeap.Offer(minHeap.Poll());
}
}
return(sizeDiff == 0 ? (minHeap.Peek() + maxHeap.Peek()) / 2.0 : maxHeap.Peek());
}
private void BuildHeap(MinHeap minHeap, MaxHeap maxHeap, int n)
{
if (maxHeap.IsEmpty() || n <= maxHeap.Peek())
{
maxHeap.Offer(n);
}
else
{
minHeap.Offer(n);
}
}
public void TestMaxHeapAdd()
{
maxHeap.Offer(10);
maxHeap.Offer(12);
maxHeap.Offer(13);
maxHeap.Offer(9);
maxHeap.Offer(5);
maxHeap.Offer(15);
Console.WriteLine("current top is: " + maxHeap.Peek());
}