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### Re: Advent of Code, Day 15, golfed!

by tybalt89 (Monsignor)
 on Dec 18, 2021 at 02:44 UTC Need Help??

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}

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}

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.
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}
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! :)

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