public void ReplacingMinElementAndCheckingIfExtractedInSortedOrder()
{
var heap = new BinaryMinHeap <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)
{
heap.Add(el);
addedElements++;
el += i;
}
}
if (heap.Count != addedElements)
{
Assert.Fail();
}
heap.ReplaceMin(int.MaxValue);
heap.ReplaceMin(int.MaxValue);
heap.ReplaceMin(int.MaxValue);
int removedElements = 0;
var min = heap.PeekMin();
while (!heap.IsEmpty)
{
if (min > heap.PeekMin())
{
Assert.Fail();
}
min = heap.PopMin();
removedElements++;
}
Assert.IsTrue(heap.IsEmpty &&
heap.Count == 0 &&
addedElements == removedElements);
}
public void HeapifyUnsortedCollectionAndCheckIfExtractedInSortedOrder()
{
var heap = new BinaryMinHeap <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 min = heap.PeekMin();
while (!heap.IsEmpty)
{
if (min > heap.PeekMin())
{
Assert.Fail("2");
}
min = heap.PopMin();
removedElements++;
}
Assert.IsTrue(heap.IsEmpty &&
heap.Count == 0 &&
addedElements == removedElements);
}
public void AddingElementsWithCustomComparerAndCheckingIfExtractedInSortedOrder()
{
//Creating heap with reversed comparer
var heap = new BinaryMinHeap <int>(Comparer <int> .Create(
(x, y) => y.CompareTo(x)));
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)
{
heap.Add(el);
addedElements++;
el += i;
}
}
if (heap.Count != addedElements)
{
Assert.Fail();
}
int removedElements = 0;
// because of the reversed comparer
var max = heap.PeekMin();
while (!heap.IsEmpty)
{
if (max < heap.PeekMin())
{
Assert.Fail();
}
max = heap.PopMin();
removedElements++;
}
Assert.IsTrue(heap.IsEmpty &&
heap.Count == 0 &&
addedElements == removedElements);
}
public void ConvertingToBinaryMaxHeap()
{
var minHeap = new BinaryMinHeap <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)
{
minHeap.Add(el);
addedElements++;
el += i;
}
}
if (minHeap.Count != addedElements)
{
Assert.Fail();
}
// Binary min heap with reversed comparer. Have to be the same as the max heap
var reversedMinHeap = new BinaryMinHeap <int>(Comparer <int> .Create(
(x, y) => y.CompareTo(x)));
reversedMinHeap.Heapify(minHeap.ToArray());
var maxHeap = minHeap.ToMaxHeap();
if (maxHeap.Count != reversedMinHeap.Count)
{
Assert.Fail();
}
var max1 = reversedMinHeap.PeekMin();
var max2 = maxHeap.PeekMax();
int removedElements = 0;
while (!reversedMinHeap.IsEmpty && !maxHeap.IsEmpty)
{
if (max1 < reversedMinHeap.PeekMin())
{
Assert.Fail();
}
if (max2 < maxHeap.PeekMax())
{
Assert.Fail();
}
max1 = reversedMinHeap.PopMin();
max2 = maxHeap.PopMax();
removedElements++;
if (max1 != max2)
{
Assert.Fail();
}
}
Assert.IsTrue(reversedMinHeap.IsEmpty &&
maxHeap.IsEmpty &&
reversedMinHeap.Count == 0 &&
maxHeap.Count == 0 &&
addedElements == removedElements);
}
public void MergingTwoHeapsAndCheckingIfExtractedInSortedOrder()
{
var heap1 = new BinaryMinHeap <int>();
var heap2 = new BinaryMinHeap <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 BinaryMinHeap <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 min1 = heap1.PeekMin();
var min2 = heap2.PeekMin();
if (min1 != min2)
{
Assert.Fail("merged heaps min element is different");
}
int removedElements = 0;
while (!heap1.IsEmpty && !heap2.IsEmpty)
{
if (min1 > heap1.PeekMin())
{
Assert.Fail();
}
if (min2 > heap2.PeekMin())
{
Assert.Fail();
}
min1 = heap1.PopMin();
min2 = heap2.PopMin();
removedElements++;
if (min1 != min2)
{
Assert.Fail("merged heaps min element is different");
}
}
Assert.IsTrue(heap1.IsEmpty &&
heap2.IsEmpty &&
heap1.Count == 0 &&
heap2.Count == 0 &&
mergedHeapElements == removedElements);
}
public void AddingAfterClearingHeap()
{
var heap = new BinaryMinHeap <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)
{
heap.Add(el);
addedElements++;
el += i;
}
}
if (heap.Count != addedElements)
{
Assert.Fail();
}
heap.Clear();
if (heap.Count != 0)
{
Assert.Fail();
}
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)
{
heap.Add(el);
addedElements++;
el += i;
}
}
if (heap.Count != addedElements)
{
Assert.Fail();
}
int removedElements = 0;
var min = heap.PeekMin();
while (!heap.IsEmpty)
{
if (min > heap.PeekMin())
{
Assert.Fail();
}
min = heap.PopMin();
removedElements++;
}
Assert.IsTrue(heap.IsEmpty &&
heap.Count == 0 &&
addedElements == removedElements);
}
public void Should_throw_on_empty_peek()
{
Assert.That(() => _emptyIntMinHeap.PeekMin(), Throws.InvalidOperationException);
}
