public static string LexicographicPermutations(int n, int k)
{
List <int> nums = new List <int>();
for (int i = 0; i <= n; i++)
{
nums.Add(i);
}
//IEnumerable<IEnumerable<int>> numper = CombinatoricFunctions.GetPermutations(nums, n+1);
IEnumerable <IEnumerable <int> > numper = SomeExtensions.GetPermutations(nums);
List <List <int> > list = numper.Select(c => c.ToList()).ToList();
return(MiscFunctions.ListToString(list[k - 1]));
}
public static long SubstringDivisibility()
{
long sum = 0;
var perm = SomeExtensions.GetPermutations(nums);
List <List <int> > list = FileFunctions.ienumtolist(perm);
foreach (List <int> num in list)
{
if (SubStringTest(num))
{
sum += MiscFunctions.ListToLong(num);
}
}
return(sum);
}