Trier rapidement un array

{
The following procedure sorts an Array with the
fast Shell-Sort algorithm.
Invented by Donald Shell in 1959,
the shell sort is the most efficient of the O(n2)
class of sorting algorithms
}

Procedure Sort_Shell( var a: array of Word);
var
bis, i, j, k: LongInt;
h: Word;
begin
bis := High(a);
k := bis shr 1;// div 2
while k > 0 do
begin
for i := 0 to bis - k do
begin
j := i;
while (j >= 0) and (a[j] > a[j + k]) do
begin
h := a[j];
a[j] := a[j + k];
a[j + k] := h;
if j > k then
Dec(j, k)
else
j := 0;
end; // {end while]
end; // { end for}
k := k shr 1; // div 2
end; // {end while}

end;