sub flatten {
    my @ret = ();
    while (@_) {
        my $k = shift;
        if (ref $_[0]) {
            my $v = shift;
            push @ret, [ $k, @$_ ] for flatten(@{$v});
        } else {
            push @ret, [ $k ];
#            push @ret, [ shift ] while @_ and (! $_[1] or ! ref $_[1]
+);
        }
    }
    @ret;
}

use Data::Dumper;
print Dumper([flatten(@{$data_struct})]);

[download]

update: flattened code (see below :)

--shmem 

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In reply to Re: A maybe(?) interesting comp-sci type problem by shmem
in thread A maybe(?) interesting comp-sci type problem by Anonymous Monk

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