private int Select(int[] arr, int k, TabControl tabControl)
{
if (arr.Length <= 10)
{
return(Find(CopyArray(arr), k));
}
int pivotNumber = ChooseWisePivot(CopyArray(arr), tabControl);
List <int> copy = arr.ToList();
int pivotIndex = Partition(ref arr, pivotNumber);
TabControl t = null;
string page = "Partition";
GUI_Manager.AddPage(tabControl, page);
t = GUI_Manager.AddPartition(tabControl, page, copy, arr.ToList(), pivotIndex, pivotNumber, k);
if (k <= pivotIndex)
{
int[] a1 = CreateArraySmaller_BiggerThanPivot(CopyArray(arr), pivotNumber, true);
if (a1.Length <= 10)
{
GUI_Manager.AddFinalResult(t ?? tabControl, a1.ToList(), k);
}
int right = Select(CopyArray(a1), k, t ?? tabControl);
return(right);
}
else
{
int[] a2 = CreateArraySmaller_BiggerThanPivot(CopyArray(arr), pivotNumber, false);
if (a2.Length <= 10)
{
GUI_Manager.AddFinalResult(t ?? tabControl, a2.ToList(), k - pivotIndex);
}
int left = Select(CopyArray(a2), k - pivotIndex, t ?? tabControl);
return(left);
}
}
private int ChooseWisePivot(int[] arr, TabControl tabControl)
{
GUI_Manager.AddArrayPage(tabControl, arr.ToList());
string page = "Split Array";
TabPage p = GUI_Manager.AddPage(tabControl, page);
TreeView tv = GUI_Manager.CreateTreeView(p);
List <int> b = new List <int>();
int iMax = (int)Math.Ceiling(arr.Length / 5.0);
int[] m = new int[iMax];
int index = 0, i = 0;
while (i != arr.Length)
{
b.Add(arr[i++]);
if (b.Count == 5)
{
page = index.ToString();
GUI_Manager.AddList(tv, b, page);
b.Sort();
m[index++] = b[2];
b.Clear();
}
}
if (iMax != index)
{
page = index.ToString();
GUI_Manager.AddList(tv, b, page);
b.Sort();
m[index] = b[(int)Math.Floor(b.Count / 2.0)];
}
tv.ExpandAll();
TabControl tControl = null;
int half = (int)Math.Ceiling(m.Length / 2.0) - 1;
int meridian = -1;
if (iMax > 10)
{
page = "Select Split Array";
GUI_Manager.AddPage(tabControl, page);
tControl = GUI_Manager.AddTabControl(tabControl, page);
meridian = Select(CopyArray(m), half, tControl);
}
else
{
meridian = Select(CopyArray(m), half, tControl);
GUI_Manager.AddSummarySplit(tabControl, m.ToList(), meridian);
}
return(meridian);
}
