public void ConsolidatedHeapDecreaseKey_CorrectCuts()
{
FibonacciHeap <int> heap = new FibonacciHeap <int>();
IList <FibonacciNode <int> > input = new List <FibonacciNode <int> >()
{
new FibonacciNode <int>(0),
new FibonacciNode <int>(28),
new FibonacciNode <int>(-13),
new FibonacciNode <int>(80),
new FibonacciNode <int>(3),
new FibonacciNode <int>(7),
new FibonacciNode <int>(-7),
new FibonacciNode <int>(42),
new FibonacciNode <int>(-11),
new FibonacciNode <int>(12)
};
IList <int> expectedElementOrder = new List <int>()
{
7,
-8,
-11,
12,
-42,
80,
-1,
-3,
0
};
foreach (FibonacciNode <int> value in input)
{
heap.Insert(value);
}
heap.ExtractMin();
// A decrease key with no structural changes
heap.DecreaseKey(input[6], -8);
// Normal cuts with parent marked
heap.DecreaseKey(input[7], -42);
heap.DecreaseKey(input[4], -1);
// Double cascading cut
heap.DecreaseKey(input[1], -3);
IList <int> result = heap.GetAllValues();
for (int i = 0; i < expectedElementOrder.Count; ++i)
{
NUnit.Framework.Assert.IsTrue(expectedElementOrder[i] == result[i]);
}
NUnit.Framework.Assert.IsTrue(heap.GetMin() == -42);
}
public void ConsolidatedHeapExtractMin_CorrectConsolidation()
{
// Create consolidated heap
FibonacciHeap <int> heap = new FibonacciHeap <int>();
IList <int> input = new List <int>()
{
0,
28,
-13,
80,
3,
7,
-7,
42,
-11,
12
};
IList <int> expectedElementOrder = new List <int>()
{
7,
42,
12,
28,
80,
3,
0,
-7
};
foreach (int value in input)
{
heap.Insert(value);
}
heap.ExtractMin();
// Trigger second consolidation
heap.ExtractMin();
IList <int> result = heap.GetAllValues();
for (int i = 0; i < expectedElementOrder.Count; ++i)
{
NUnit.Framework.Assert.IsTrue(expectedElementOrder[i] == result[i]);
}
NUnit.Framework.Assert.IsTrue(heap.GetMin() == -7);
}
public void UnconsolidatedHeapInsertWithValue_RightOder()
{
FibonacciHeap <int> heap = new FibonacciHeap <int>();
IList <int> input = new List <int>()
{
0,
28,
-13,
80
};
foreach (int value in input)
{
heap.Insert(value);
}
IList <int> result = heap.GetAllValues();
for (int i = 0; i < input.Count; ++i)
{
NUnit.Framework.Assert.IsTrue(input[i] == result[i]);
}
}
public void UnconsolidatedHeapExtractMin_CorrectValue()
{
FibonacciNode <int> node = new FibonacciNode <int>(-20);
FibonacciHeap <int> heap = new FibonacciHeap <int>();
IList <int> input = new List <int>()
{
0,
28,
-13,
80
};
heap.Insert(node);
foreach (int value in input)
{
heap.Insert(value);
}
NUnit.Framework.Assert.IsTrue(heap.ExtractMin() == node);
NUnit.Framework.Assert.IsTrue(heap.GetMin() == -13);
NUnit.Framework.Assert.IsTrue(heap.GetAllValues().Count == input.Count);
}
public void EmptyHeapGetAllValues_Empty()
{
FibonacciHeap <int> heap = new FibonacciHeap <int>();
NUnit.Framework.Assert.IsTrue(heap.GetAllValues().Count == 0);
}