in reply to Re: (Efficiency Golf) Triangular numbers
in thread (Efficiency Golf) Triangular numbers

I'm familiar with assigning to slices of a hash, and its use in this line:

@seen {$t, $h, $r, $e} = ();

was very clever. However, why did you use slices in these lines?

@seen {$n,} = (); .... @seen {$o,} = ();
Aren't they equivalent to:
$seen{$n} = undef; $seen{$o} = undef;
Or even just:
@seen {$n} = (); # note the lack of comma after $n .... @seen {$o} = ();
I guess its that trailing comma that looks odd to me.

p.s. props on the @HIGH and @LOW generation... very sneaky!