[SOLVED] CS代考计算机代写 use strict;

use strict;
use warnings;

use tests::random;

sub shuffle {
my ($in, $cnt, $sz) = @_;
$cnt * $sz == length $in or die;
my (@a) = 0…$cnt – 1;
for my $i (0…$cnt – 1) {
my ($j) = $i + random_ulong () % ($cnt – $i);
@a[$i, $j] = @a[$j, $i];
}
my ($out) = “”;
$out .= substr ($in, $_ * $sz, $sz) foreach @a;
return $out;
}

1;