public void UnrankSingletonString()
{
string s = "x";
int n = s.Length;
long r = KevinMath.LongRandom(0, KevinMath.Factorial(n) - 1, new Random());
int[] pi = RankUnrank.InitIndexArray(n);
RankUnrank.Unrank(n, r, pi);
string ps = GetPermString(s, pi);
Console.WriteLine(string.Format("r:{0} s:{1} p:{2}", r, s, ps));
}
public void UnrankStringLenThree()
{
string s = "xyz";
int n = s.Length;
Console.WriteLine(string.Format("s:{0}", s));
for (int r = 0; r < KevinMath.Factorial(n); r++)
{
int[] pi = RankUnrank.InitIndexArray(n);
RankUnrank.Unrank(n, r, pi);
string ps = GetPermString(s, pi);
Console.WriteLine(string.Format("r:{0} p:{1}", r, ps));
//int[] inv = RankUnrank.GetInverseArray(pi);
//long rank = RankUnrank.Rank(n, pi, inv);
//Assert.AreEqual(r, rank);
}
}