/// <summary>
/// Get Node's value by Index
/// </summary>
/// <param name="Index">Index start from 1.</param>
/// <returns>if Index is valid ,return real value otherwise ,return -1</returns>
public int GetValue(int Index)
{
List <int> listSet = RBTree.ToList <int>();
if (Index <= listSet.Count)
{
return(listSet[Index - 1]);
}
return(-1);
}
public System.Collections.Generic.List <string> Permutation(string str)
{
System.Collections.Generic.SortedSet <string> lst = new System.Collections.Generic.SortedSet <string>();
if (str.Length == 0)
{
return(lst.ToList());
}
if (str.Length == 1)
{
lst.Add(str);
return(lst.ToList());
}
System.Collections.Generic.List <int> pivotes = new System.Collections.Generic.List <int>();
for (var i = 0; i < str.Length; ++i)
{
Permutation(str, i, "", pivotes, lst);
}
return(lst.ToList());
}