static InversionList merge(InversionList partA, InversionList partB)
{
InversionList partC = new InversionList();
partC.list = new List <int>();
while (partA.list.Count != 0 && partB.list.Count != 0)
{
if (partA.list[0] > partB.list[0])
{
partC.list.Add(partB.list[0]);
partB.list.RemoveAt(0);
partC.inversions += partA.list.Count;
}
else
{
partC.list.Add(partA.list[0]);
partA.list.RemoveAt(0);
}
}
while (partA.list.Count != 0)
{
partC.list.Add(partA.list[0]);
partA.list.RemoveAt(0);
}
while (partB.list.Count != 0)
{
partC.list.Add(partB.list[0]);
partB.list.RemoveAt(0);
}
return(partC);
}
static InversionList mergeSort(InversionList listToSort)
{
InversionList returnList = new InversionList();
if (listToSort.list.Count == 1)
{
return(listToSort);
}
int n = listToSort.list.Count / 2;
InversionList part1 = new InversionList();
InversionList part2 = new InversionList();
part1.list = new List <int>(n);
part2.list = new List <int>(n);
for (int i = 0; i < n; i++)
{
part1.list.Add(listToSort.list[i]);
part2.list.Add(listToSort.list[i + n]);
}
part1 = mergeSort(part1);
part2 = mergeSort(part2);
returnList = merge(part1, part2);
returnList.inversions += part1.inversions + part2.inversions;
return(returnList);
}
static void Main(string[] args)
{
int numberOfExecutions = 8;
int size = numberOfExecutions;
List <InversionList> listOfListsToSort = new List <InversionList>();
for (int i = 0; i < numberOfExecutions; i++)
{
int[] temp = generateRandomArray(size);
List <int> tempList = new List <int>();
InversionList tempInvList = new InversionList();
tempInvList.list = tempList;
foreach (int item in temp)
{
tempInvList.list.Add(item);
}
listOfListsToSort.Add(tempInvList);
size = size * 2;
}
List <long> times = new List <long>();
List <int> sizes = new List <int>();
List <List <int> > listsUnSorted = new List <List <int> >();
List <List <int> > listsSorted = new List <List <int> >();
List <int> inversionsList = new List <int>();
foreach (InversionList invList in listOfListsToSort)
{
Stopwatch inversionCountWatch = new Stopwatch();
InversionList tempInvList = new InversionList();
listsUnSorted.Add(invList.list);
inversionCountWatch.Start();
tempInvList = mergeSort(invList);
inversionCountWatch.Stop();
sizes.Add(tempInvList.list.Count);
times.Add(inversionCountWatch.ElapsedTicks);
listsSorted.Add(tempInvList.list);
inversionsList.Add(tempInvList.inversions);
}
Console.WriteLine("Time taken: ");
print(times);
Console.WriteLine("Size of list: ");
print(sizes);
Console.WriteLine("Inversions found: ");
print(inversionsList);
/*
* int[] tempArray = { 1, 3, 4, 2, 5, 6, 7, 8};
* List<int> listToSort = new List<int>();
* InversionList InvList = new InversionList();
*
* InvList.list = listToSort;
*
* foreach (int item in tempArray)
* {
* InvList.list.Add(item);
* }
*
* print(InvList.list);
* InvList = mergeSort(InvList);
* print(InvList.list);
* Console.WriteLine(InvList.inversions);
*/
Console.ReadKey();
}
