private static void TestMaxInvariant(MaxHeap <int> heap, string error)
{
if (heap.Count % 500 == 0)
{
Console.WriteLine("Cycle {0}\n", heap.Count);
}
heap.Sort();
for (int index = 0; index < heap.Count - 1; index++)
{
Debug.Assert(heap[index] <= heap[index + 1], error);
}
heap.BuildHeap();
}
private static void TestMaxPop(MaxHeap <int> heap, string error)
{
int temp1 = heap.PopMax();
int count = heap.Count;
Console.WriteLine("New Heap: [{0}]\n", string.Join(", ", heap));
for (int i = 0; i < count; i++)
{
int temp2 = heap.PopMax();
Debug.Assert(temp1 >= temp2, error);
temp1 = temp2;
Console.WriteLine("New Heap: [{0}]\n", string.Join(", ", heap));
}
}
private static void MaxTest()
{
Console.WriteLine("This section is to test the MAX HEAP class.\n");
string sort_error = "The current value is not less than the next value on the array.";
string pop_error = "The current value is not grater than the next value on the array";
string invariant_error = "The invariants have been broken.";
MaxHeap <int> myHeap = new MaxHeap <int>();
int[] numberList = new int[] { 2, 5, 9, 2, 8, 1, 4, 7, 3, 6 };
Console.WriteLine("Adding the following numbers to the heap: [{0}]\n",
string.Join(", ", numberList));
foreach (int number in numberList)
{
myHeap.Add(number);
}
Console.WriteLine("New Heap: [{0}]\n", string.Join(", ", myHeap));
Console.WriteLine("Performing Heap Sort...\n");
myHeap.Sort();
TestMaxSort(myHeap, sort_error);
Console.WriteLine("New Heap: [{0}]\n", string.Join(", ", myHeap));
Console.WriteLine("Rebuilding Heap...\n");
myHeap.BuildHeap();
Console.WriteLine("New Heap: [{0}]\n", string.Join(", ", myHeap));
Console.WriteLine("Poping the top value until heap is empty...\n");
TestMaxPop(myHeap, pop_error);
int elements = 20000;
myHeap = new MaxHeap <int>(elements);
int[] random_list = RandomIntArray(elements);
Console.WriteLine("Adding {0} values to a new heap and verifying the invariants...\n", elements);
Console.WriteLine("This part will take a while...\n");
foreach (int number in random_list)
{
myHeap.Add(number);
TestMaxInvariant(myHeap, invariant_error);
}
Console.WriteLine("Heap too big to print on console, current elements in heap: {0}\n", myHeap.Count);
Console.WriteLine("Going to pop half of the values out of the heap and verifying the invariants...\n");
Console.WriteLine("Again... This part will take a while...\n");
for (int i = 0; i < elements / 2; i++)
{
myHeap.PopMax();
TestMaxInvariant(myHeap, invariant_error);
}
Console.WriteLine("Heap too big to print on console, current elements in heap: {0}\n", myHeap.Count);
Console.WriteLine("----------------------------------------------------");
}
