shuffle array delphi
procedure FastPermuteArray(A: TDynIntegerArray);
procedure Swap(n, m: integer);
var
tmp: integer;
begin
tmp := A[n];
A[n] := A[m];
A[m] := tmp;
end;
var
i: Integer;
begin
for i := High(A) downto 1 do
Swap(i, RandomRange(0, i));
end;