http://www.perlmonks.org?node_id=11139698


in reply to Advent of Code, Day 15, golfed!

Quick golf trick: push() has a return value :)
Replace push@a,/./g;$r||=@a with $r||=push@a,/./g and save 3 strokes.
UPDATE: Oops. that what I get for not testing :(

Alternates: 

push@a,@r=/./g}{print$s{-1+map{$u{$_}||=$a[$_]+$s{$g-1}for
grep$a[$_]*!$s{$_},$g+@r,$g-!!($g%@r),$g-@r*($g>=@r),++$g*!!($g
%@r);($g)=sort{$u{$a}-$u{$b}}keys%u;$s{$g}=delete$u{$g}}@a}

[download]

and 

# problem description says "resembles a square"
push@a,/./g}{print$s{-1+map{$u{$_}||=$a[$_]+$s{$g-1}for
grep$a[$_]*!$s{$_},$g+$.,$g-!!($g%$.),$g-$.*($g>=$.),++$g*!!($g
%$.);($g)=sort{$u{$a}-$u{$b}}keys%u;$s{$g}=delete$u{$g}}@a}

[download]

Replies are listed 'Best First'.
Re^2: Advent of Code, Day 15, golfed!
by Jasper (Chaplain) on Dec 18, 2021 at 10:32 UTC
    I don't think that will work because only the first row will be pushed into @a.
[reply]
Re^2: Advent of Code, Day 15, golfed!
by Jasper (Chaplain) on Dec 19, 2021 at 04:39 UTC
    Combining that with another stroke saved by replacing the stupid ++$g, $g-1 stuff 
    push@a,/./g}{print$s{-1+map{$u{$_}||=$a[$_]+$s{$g}for
grep$a[$_]*!$s{$_},$g+$.,$g-($g%$.>0),$g-$.*($g>=$.),$g+($g%$.
<$.-1);($g)=sort{$u{$a}-$u{$b}}keys%u;$s{$g}=delete$u{$g}}@a}

    [download]
[reply]
[d/l]
Re^2: Advent of Code, Day 15, golfed!
by Jasper (Chaplain) on Dec 19, 2021 at 03:46 UTC
    $. definitely works, how could I forget! :)
[reply]

In Section Obfuscated Code