public static CustomLinkedList <T> ToSinglyLinkedList <T>(this IEnumerable <T> enumerable)
{
CustomLinkedList <T> output = new CustomLinkedList <T>();
output.AppendRange(enumerable);
return(output);
}
public void Sort(IComparer <T> comparer)
{
if (head == null || head.Next == null)
{
return;
}
CustomLinkedList <T> left = new CustomLinkedList <T>();
Node <T> tmp = head;
left.head = tmp;
Node <T> slowPointer = head;
Node <T> fastPointer = head;
while (fastPointer != null && fastPointer.Next != null)
{
tmp = slowPointer;
slowPointer = slowPointer.Next;
fastPointer = fastPointer.Next.Next;
}
tmp.Next = null;
CustomLinkedList <T> right = new CustomLinkedList <T>();
right.head = slowPointer;
right.Sort(comparer);
left.Sort(comparer);
Merge(left, right, comparer);
}
private void Merge(CustomLinkedList <T> left, CustomLinkedList <T> right, IComparer <T> comparer)
{
if (left.head == null)
{
head = right.head;
}
if (right.head == null)
{
head = left.head;
}
Node <T> currentLeft = left.head;
Node <T> currentRight = right.head;
if (CompareElements(comparer, currentLeft.Value, currentRight.Value) <= 0)
{
head = currentLeft;
currentLeft = currentLeft.Next;
}
else
{
head = currentRight;
currentRight = currentRight.Next;
}
Node <T> current = head;
while (currentRight != null && currentLeft != null)
{
if (CompareElements(comparer, currentLeft.Value, currentRight.Value) <= 0)
{
current.Next = currentLeft;
current = current.Next;
current.Next = currentRight;
}
else
{
current.Next = currentRight;
current = current.Next;
current.Next = currentLeft;
}
currentLeft = currentLeft.Next;
currentRight = currentRight.Next;
}
if (currentRight != null)
{
current.Next = currentRight;
}
if (currentLeft != null)
{
current.Next = currentLeft;
}
}
public IEnumerable <int> IndexesOf(T value)
{
CustomLinkedList <int> output = new CustomLinkedList <int>();
int index = 0;
Node <T> current = head;
while (current != null)
{
if (current.Value.Equals(value))
{
yield return(index);
}
current = current.Next;
index++;
}
}