@array = (["filename1",1],["filename2",1,2,3],["filename3",3,2]);
@array = sort {$#$b <=> $#$a} @array;
for (@array){
	print $$_[0];
}

##</code><code>##

%hash = ("filename1" => [1], "filename2" => [1,2,3], "filename3" => [3,2]);
@sortedkeys = sort {$#{$hash{$b}} <=> $#{$hash{$a}} } keys (%hash);
print @sortedkeys;