/// <summary>
/// we can use a binary tree to represent prefix free code where 0 means go to the left child and 1 means go to the right child.
/// Let c.freq denote the frequency of c in the file and let dt(c) denote the depth of c's leaf in the tree.
/// The number of bits required to encode a file is
/// sum(c.freq*dt(c))
///
///
/// this runs at O(nlgn)
/// </summary>
public static Character <T> Build(List <Tuple <T, double> > characters)
{
if (characters == null || characters.Count <= 0)
{
throw new ArgumentNullException("argument cann't be null or empty");
}
int n = characters.Count;
Character <T>[] arrs = new Character <T> [n];
//build a min priority queue using minheap
for (int i = 0; i < n; i++)
{
arrs[i] = new Character <T>(characters[i].Item1, characters[i].Item2);
}
MinHeap <Character <T> > heap = MinHeap <Character <T> > .BuildMinHeap(arrs);
for (int i = 0; i < n - 1; i++)
{
Character <T> combine = new Character <T>();
Character <T> left = heap.Pop();
Character <T> right = heap.Pop();
combine.Left = left;
combine.Right = right;
combine.Freq = left.Freq + right.Freq;
heap.Insert(combine);
}
return(heap.Peek());
}
/** initialize data structure */
public MedianFinder()
{
lowHeap = new MaxHeap(new List <int>());
lowHeap.BuildMaxHeap();
highHeap = new MinHeap(new List <int>());
highHeap.BuildMinHeap();
even = true;
}
public void BuildMinHeapGeneratesCorrectMinHeap()
{
heap.BuildMinHeap();
var validData = new int[6] {
0, 1, 2, 5, 4, 6
};
for (int i = 0; i < validData.Length; i++)
{
if (validData[i] != heap.Data[i])
{
Assert.Fail("Heap has not generated correct Max Heap order");
}
}
}
public void Init()
{
heap = new MinHeap <int>(heapData);
heap.BuildMinHeap();
}
private void button23_Click(object sender, EventArgs e)
{
Form1 f1 = (Form1)Application.OpenForms["Form1"];
f1.GB_Status_AppendText_Nextline("--------------------------------", Color.Black);
//MinHeap mh = new MinHeap(15);
MinHeap <int> mh = new MinHeap <int>(15);
mh.Insert(77);
mh.Insert(7);
mh.Insert(64);
mh.Insert(21);
mh.Insert(89);
mh.Insert(1);
mh.Insert(92);
mh.Insert(17);
mh.Insert(3);
mh.Insert(30);
mh.Insert(42);
mh.Insert(50);
mh.Insert(2);
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("1) mh.getMin() : " + mh.getMin(), Color.Red);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("--------------------------------", Color.Black);
int[] arr = { 77, 7, 64, 21, 89, 1, 92, 17, 3, 30, 42, 50, 2 };
mh.BuildMinHeap(arr);
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
f1.GB_Status_AppendText_Nextline("2) mh.getMin() : " + mh.getMin(), Color.Green);
mh.RemoveMin();
mh.displayHeap();
}
