public void TestExtractForNElements(FibonacciHeap heap, int numOfExtractions)
{
Stopwatch stopwatch = Stopwatch.StartNew();
for (int i = 0; i < numOfExtractions; i++)
{
heap.ExtractMin();
}
stopwatch.Stop();
Console.WriteLine($"Extraction of {numOfExtractions} minimum values done in {stopwatch.ElapsedMilliseconds} ms");
}
public void TestAllForHeapOfN(int numOfElements)
{
List <FibonacciNode> allNodes;
FibonacciHeap heap = GenerateRandomHeap(numOfElements, out allNodes);
Console.WriteLine($"Test for Fibonacci heap of {numOfElements} elements\n");
TestDecreaseKeyForNElements(heap, allNodes, numOfElements / 10);
TestDeleteNodeForNElements(heap, allNodes, numOfElements / 10);
allNodes.AddRange(TestInsertionForNElements(heap, numOfElements / 10));
TestExtractForNElements(heap, allNodes.Count / 10);
Console.WriteLine();
}
public FibonacciHeap GenerateRandomHeap(int numOfElements, out List <FibonacciNode> allNodes)
{
List <int> keys = new List <int>(numOfElements);
allNodes = new List <FibonacciNode>(numOfElements);
FibonacciHeap newHeap = new FibonacciHeap();
Random generator = new Random();
for (int i = 0; i < numOfElements; i++)
{
keys.Add(generator.Next(_lowerLimit, _maxLimit));
}
foreach (int singleKey in keys)
{
allNodes.Add(newHeap.Insert(singleKey));
}
return(newHeap);
}
public void TestDecreaseKeyForNElements(FibonacciHeap heap, List <FibonacciNode> allNodes, int numOfDecreases)
{
Random generator = new Random();
List <FibonacciNode> nodesToAlter = new List <FibonacciNode>();
for (int i = 0; i < numOfDecreases; i++)
{
nodesToAlter.Add(allNodes[generator.Next(0, allNodes.Count)]);
}
Stopwatch stopwatch = Stopwatch.StartNew();
foreach (FibonacciNode singleNode in nodesToAlter)
{
heap.DecreaseKey(singleNode, generator.Next(0, singleNode.Key));
}
stopwatch.Stop();
Console.WriteLine($"Decrease of {numOfDecreases} keys done in {stopwatch.ElapsedMilliseconds} ms");
}
public FibonacciHeap Merge(FibonacciHeap heapToMerge)
{
FibonacciHeap newHeap = new FibonacciHeap();
newHeap.RootList = RootList;
newHeap.MinNode = MinNode;
FibonacciNode lastNode = heapToMerge.RootList.Left;
heapToMerge.RootList.Left = newHeap.RootList.Left;
newHeap.RootList.Left.Right = heapToMerge.RootList;
newHeap.RootList.Left = lastNode;
newHeap.RootList.Left.Right = newHeap.RootList;
if (heapToMerge.MinNode.Key < newHeap.MinNode.Key)
{
newHeap.MinNode = heapToMerge.MinNode;
}
newHeap.numOfNodes = numOfNodes + heapToMerge.numOfNodes;
return(newHeap);
}
public List <FibonacciNode> TestInsertionForNElements(FibonacciHeap heap, int numOfInsertions)
{
List <int> keys = new List <int>(numOfInsertions);
List <FibonacciNode> allNodes = new List <FibonacciNode>(numOfInsertions);
Random generator = new Random();
for (int i = 0; i < numOfInsertions; i++)
{
keys.Add(generator.Next(_lowerLimit, _maxLimit));
}
Stopwatch stopwatch = Stopwatch.StartNew();
foreach (int singleKey in keys)
{
allNodes.Add(heap.Insert(singleKey));
}
stopwatch.Stop();
Console.WriteLine($"Insertion of {numOfInsertions} elements done in {stopwatch.ElapsedMilliseconds} ms");
return(allNodes);
}
public void TestDeleteNodeForNElements(FibonacciHeap heap, List <FibonacciNode> allNodes, int numOfDeletions)
{
Random generator = new Random();
List <int> nodesToDelete = new List <int>();
for (int i = 0; i < numOfDeletions; i++)
{
int randomIndex = generator.Next(0, allNodes.Count);
while (nodesToDelete.Exists(index => index == randomIndex))
{
randomIndex = generator.Next(0, allNodes.Count);
}
nodesToDelete.Add(randomIndex);
}
Stopwatch stopwatch = Stopwatch.StartNew();
foreach (int singleIndex in nodesToDelete)
{
heap.Delete(allNodes[singleIndex]);
}
stopwatch.Stop();
Console.WriteLine($"Deletion of {numOfDeletions} nodes done in {stopwatch.ElapsedMilliseconds} ms");
}