static int LListPartition(LinkedListEmulator list, int head, int tail)
{
// set pivot as h element
int pivot = list.GetNodeData(tail);
// similar to i = l-1 for array implementation
int i = list.GetPrevAdress(head);
int temp;
// Similar to "for (int j = l; j <= h- 1; j++)"
for (int j = head; j != tail; j = list.GetNextAdress(j))
{
if (list.GetNodeData(j) <= pivot)
{
// Similar to i++ for array
i = (i == -1) ? head : list.GetNextAdress(i);
temp = list.GetNodeData(i);
list.SetNodeData(i, list.GetNodeData(j));
list.SetNodeData(j, temp);
}
}
i = (i == -1) ? head : list.GetNextAdress(i); // Similar to i++
temp = list.GetNodeData(i);
list.SetNodeData(i, list.GetNodeData(tail));
list.SetNodeData(tail, temp);
return(i);
}
static string TestListFile(LinkedListEmulator list)
{
var time = Stopwatch.StartNew();
QuickSort_OnlyFile.Sort.LinkedListQuickSort(list, list.Head, list.Tail);
time.Stop();
return(time.Elapsed.Minutes + "." + time.Elapsed.Seconds + "." + time.Elapsed.Milliseconds);
}
public static void LinkedListQuickSort(LinkedListEmulator list, int head, int tail)
{
if (tail != -1 && head != tail && head != list.GetNextAdress(tail))
{
int temp = LListPartition(list, head, tail);
LinkedListQuickSort(list, head, list.GetPrevAdress(temp));
LinkedListQuickSort(list, list.GetNextAdress(temp), tail);
}
}
static LinkedListEmulator GetRandomListFile(int length)
{
var list = new LinkedListEmulator("testlist.dat");
var random = new Random();
for (int i = 0; i < length; i++)
{
list.AddLast(random.Next(int.MinValue, int.MaxValue));
}
return(list);
}
