I couldn't decipher what you are using "Ordered Array: (1,2,3,8,4,5,6)" for. But, finding all subsets from (2,1,4,3,5) of length 3 where the members appear in order, you can use: 

sub genOrderedSubList {
    my $size= shift @_;
    my @list= @_;
    my @idx= ( -1 );
    return sub {
        my $i= $#idx;
        while(  1  ) {
            do {
                ++$idx[$i];
                if(  $#list < $idx[$i]  ) {
                    if(  --$i < 0  ) {
                        @idx= ( -1 );
                        return;
                    }
                    redo;
                }
            } while(  0 < $i
                &&  $list[$idx[$i]] <= $list[$idx[$i-1]]  );
            return  @list[@idx]   if  $i == $size-1;
            $idx[$i+1]= $idx[$i];
            ++$i;
        }
    }
}

@ARGV= ( 3, 2,1,4,3,5 )   if  ! @ARGV;
my $gen= genOrderedSubList( @ARGV );
my @res;
while(  @res= $gen->()  ) {
    print "@res\n";
}

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        - tye

In reply to (tye)Re: Items in Order by tye
in thread Items in Order by artist

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