private static void Improved2Sort(T[] xs, int lo, int hi)
{
if (hi <= lo + M)
{
Insertion <T> .Sort(xs, lo, hi);
return;
}
int lt = lo;
int gt = hi;
int i = lo + 1;
T v = xs[lo];
while (i <= gt)
{
int cmp = xs[i].CompareTo(v);
if (cmp < 0)
{
Sorting <T> .Exchange(xs, lt ++, i ++);
}
else if (cmp > 0)
{
Sorting <T> .Exchange(xs, i, gt --);
}
else
{
i++;
}
} // Now xs[lo..lt-1] < v = xs[lt..gt] < xs[gt+1..hi]
Improved2Sort(xs, lo, lt - 1);
Improved2Sort(xs, gt + 1, hi);
}
private static void Improved1Sort(T[] xs, int lo, int hi)
{
if (hi <= lo + M)
{
Insertion <T> .Sort(xs, lo, hi);
return;
}
int j = Partition(xs, lo, hi);
Improved1Sort(xs, lo, j - 1);
Improved1Sort(xs, j + 1, hi);
}