static string Substract(string from, string value)
{
var bsd = new Bst <char>();
foreach (var ch in value)
{
bsd.AddUnique(ch);
}
var builder = new StringBuilder();
foreach (var ch in from)
{
if (!bsd.Contains(ch))
{
builder.Append(ch);
}
}
return(builder.ToString());
}
private static bool HasDublicates(int[] array)
{
if (array == null)
{
throw new ArgumentNullException();
}
if (array.Length == 0)
{
return(false);
}
var bsd = new Bst <int>();
for (var i = 1; i < array.Length; i++)
{
if (!bsd.AddUnique(array[i]))
{
return(true);
}
}
return(false);
}