public void Heapify_Null()
{
Assert.Throws <ArgumentNullException>(delegate
{
List <int> list = null;
_binaryMaxHeap.Heapify(list);
});
}
public void HeapifyUnsortedCollectionAndCheckIfExtractedInSortedOrder()
{
var heap = new BinaryMaxHeap <int>();
var unsortedList = new List <int>();
int maxHeapElement = 50000;
int minHeapElement = -50000;
int addedElements = 0;
//Adding every seventh number, then every fifth number,
//every third and at last all numbers
//NOTE: some items are added more than once
for (int i = 7; i > 0; i -= 2)
{
int el = minHeapElement;
while (el <= maxHeapElement)
{
unsortedList.Add(el);
addedElements++;
el += i;
}
}
heap.Heapify(unsortedList);
if (heap.Count != addedElements)
{
Assert.Fail("1");
}
int removedElements = 0;
var max = heap.PeekMax();
while (!heap.IsEmpty)
{
if (max < heap.PeekMax())
{
Assert.Fail("2");
}
max = heap.PopMax();
removedElements++;
}
Assert.IsTrue(heap.IsEmpty &&
heap.Count == 0 &&
addedElements == removedElements);
}
public void Merge_NotEmpty()
{
var list = new List <int>()
{
1, 5, 0, -2, 4
};
_binaryMaxHeap.Heapify(list);
BinaryMaxHeap <int> otherBinaryMaxHeap = new BinaryMaxHeap <int>();
list = new List <int>()
{
4, 32, -5
};
otherBinaryMaxHeap.Heapify(list);
int countBefore = _binaryMaxHeap.Count;
_binaryMaxHeap.Merge(otherBinaryMaxHeap);
Assert.Greater(_binaryMaxHeap.Count, countBefore, "Count changed");
}
public void Add_ArrayFull()
{
var tempBinaryMaxHeap = new BinaryMaxHeap <int>(4);
var list = new List <int>()
{
1, 4, 3, 5
};
tempBinaryMaxHeap.Heapify(list);
Assert.Multiple(delegate
{
Assert.AreEqual(4, tempBinaryMaxHeap.Count, "Count before");
Assert.AreEqual(4, tempBinaryMaxHeap.array.Capacity, "Capacity before");
});
var before = tempBinaryMaxHeap.array.Capacity;
tempBinaryMaxHeap.Add(10);
Assert.Multiple(delegate
{
Assert.Greater(tempBinaryMaxHeap.Count, before, "Count after");
Assert.Greater(tempBinaryMaxHeap.array.Capacity, before, "Capacity after");
});
}
public void ConvertingToBinaryMinHeap()
{
var maxHeap = new BinaryMaxHeap <int>();
int maxHeapElement = 50000;
int minHeapElement = -50000;
int addedElements = 0;
//Adding every seventh number, then every fifth number,
//every third and at last all numbers
//NOTE: some items are added more than once
for (int i = 7; i > 0; i -= 2)
{
int el = minHeapElement;
while (el <= maxHeapElement)
{
maxHeap.Add(el);
addedElements++;
el += i;
}
}
if (maxHeap.Count != addedElements)
{
Assert.Fail();
}
// Binary max heap with reversed comparer. Have to be the same as the min heap
var reversedMaxHeap = new BinaryMaxHeap <int>(Comparer <int> .Create(
(x, y) => y.CompareTo(x)));
reversedMaxHeap.Heapify(maxHeap.ToArray());
var minHeap = maxHeap.ToMinHeap();
if (minHeap.Count != reversedMaxHeap.Count)
{
Assert.Fail();
}
var min1 = reversedMaxHeap.PeekMax();
var min2 = minHeap.PeekMin();
int removedElements = 0;
while (!reversedMaxHeap.IsEmpty && !minHeap.IsEmpty)
{
if (min1 > reversedMaxHeap.PeekMax())
{
Assert.Fail();
}
if (min2 > minHeap.PeekMin())
{
Assert.Fail();
}
min1 = reversedMaxHeap.PopMax();
min2 = minHeap.PopMin();
removedElements++;
if (min1 != min2)
{
Assert.Fail();
}
}
Assert.IsTrue(reversedMaxHeap.IsEmpty &&
minHeap.IsEmpty &&
reversedMaxHeap.Count == 0 &&
minHeap.Count == 0 &&
addedElements == removedElements);
}
public void MergingTwoHeapsAndCheckingIfExtractedInSortedOrder()
{
var heap1 = new BinaryMaxHeap <int>();
var heap2 = new BinaryMaxHeap <int>();
int maxElementInFirstHeap = 100000;
int minElementInFirstHeap = 0;
int addedElementsInFirstHeap = 0;
//Adding every seventh number, then every fifth number,
//every third and at last all numbers
//NOTE: some items are added more than once
for (int i = 7; i > 0; i -= 2)
{
int el = minElementInFirstHeap;
while (el <= maxElementInFirstHeap)
{
heap1.Add(el);
addedElementsInFirstHeap++;
el += i;
}
}
int maxElementInSecondHeap = 50000;
int minElementInSecondHeap = -50000;
int addedElementsInSecondHeap = 0;
//Adding every seventh number, then every fifth number,
//every third and at last all numbers
//NOTE: some items are added more than once
for (int i = 7; i > 0; i -= 2)
{
int el = minElementInSecondHeap;
while (el <= maxElementInSecondHeap)
{
heap2.Add(el);
addedElementsInSecondHeap++;
el += i;
}
}
if (heap1.Count != addedElementsInFirstHeap)
{
Assert.Fail("first heap incorrect count");
}
if (heap2.Count != addedElementsInSecondHeap)
{
Assert.Fail("second heap incorrect count");
}
var oldHeap = new BinaryMaxHeap <int>();
oldHeap.Heapify(heap1.ToArray());
heap1.Merge(heap2);
heap2.Merge(oldHeap);
int mergedHeapElements = addedElementsInFirstHeap + addedElementsInSecondHeap;
if (heap1.Count != mergedHeapElements)
{
Assert.Fail("merged first with second incorect count");
}
if (heap2.Count != mergedHeapElements)
{
Assert.Fail("merged second with first incorrect count");
}
var max1 = heap1.PeekMax();
var max2 = heap2.PeekMax();
if (max1 != max2)
{
Assert.Fail("merged heaps min element is different");
}
int removedElements = 0;
while (!heap1.IsEmpty && !heap2.IsEmpty)
{
if (max1 < heap1.PeekMax())
{
Assert.Fail();
}
if (max2 < heap2.PeekMax())
{
Assert.Fail();
}
max1 = heap1.PopMax();
max2 = heap2.PopMax();
removedElements++;
if (max1 != max2)
{
Assert.Fail("merged heaps min element is different");
}
}
Assert.IsTrue(heap1.IsEmpty &&
heap2.IsEmpty &&
heap1.Count == 0 &&
heap2.Count == 0 &&
mergedHeapElements == removedElements);
}
