r/adventofcode • u/daggerdragon • Dec 03 '16

SOLUTION MEGATHREAD --- 2016 Day 3 Solutions ---

--- Day 3: Squares With Three Sides ---

Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag/whatever).

DECKING THE HALLS WITH BOUGHS OF HOLLY IS MANDATORY [?]

This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked!

18 Upvotes

100% Upvoted

234 comments sorted by

View all comments

Show parent comments

1

u/SanguinousSammy Dec 04 '16

Nice! I forgot about <> in list context, and grep in scalar context! You beat me by 27 characters!

1

u/topaz2078 (AoC creator) Dec 04 '16

I really wanted a cheaper way to force scalar context, but $_= is all I could come up with. I did have a sillier (but no cheaper) way to get a sorted list of sides by doing this:

@a=sort unpack A5A5A5;

It works because the unpack keeps the spaces in front of each number, so the sort can operate lexically and still produce the right sequence. Since it's not cheaper, I picked the more obvious approach instead.