public SkipList(List <T> inputList)
{
int maximumLevel = (int)Math.Log(inputList.Count, 2);
Head = new SkipListNode <T> {
Key = default(T), Level = maximumLevel
};
var a = Head.Next;
for (int i = 0; i < inputList.Count; i++)
{
a = new SkipListNode <T> {
Key = inputList[i]
};
for (int j = 1; j <= maximumLevel; j++)
{
if (i % Math.Pow(2, j) != 0)
{
a.Level = j - 1;
}
}
a = a.Next;
}
a = new SkipListNode <T> {
Key = default(T), Level = maximumLevel, Next = null
};
var levelHead = Head;
var levelIterator = Head;
a = levelHead.Lower;
for (int i = 2; i <= maximumLevel; i++)
{
a = new SkipListNode <T> {
Key = default(T), Level = maximumLevel, Upper = a
};
while (levelIterator != null)
{
if (levelIterator.Level >= i)
{
levelIterator.Lower = new SkipListNode <T> {
Key = levelIterator.Key, Level = levelIterator.Level, Upper = levelIterator
};
a.Next = levelIterator.Lower;
a = a.Next;
}
levelIterator = levelIterator.Next;
}
a.Next = new SkipListNode <T> {
Key = default(T), Level = maximumLevel, Next = null, Upper = levelIterator
};
levelHead = levelHead.Lower;
a = levelHead.Lower;
levelIterator = levelHead;
}
}
public void Add(T value)
{
var a = Find(value);
var newNode = new SkipListNode <T> {
Key = value, Next = a.Next
};
a.Next = newNode;
var randKey = new Random();
int coin = randKey.Next(2);
while (coin != 0)
{
a = a.Lower;
newNode = new SkipListNode <T> {
Key = value, Next = a.Next
};
a.Next = newNode;
coin = randKey.Next(2);
}
}