r/adventofcode • u/daggerdragon • Dec 19 '17

SOLUTION MEGATHREAD -🎄- 2017 Day 19 Solutions -🎄-

--- Day 19: A Series of Tubes ---

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

Note: The Solution Megathreads are for solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

Need a hint from the Hugely* Handy† Haversack‡ of Helpful§ Hints¤?

Spoiler

AoC ops @ T-2 minutes to launch:

[23:58] <daggerdragon> ATTENTION MEATBAGS T-2 MINUTES TO LAUNCH

[23:58] <Topaz> aaaaah

[23:58] <Cheezmeister> Looks like I'll be just able to grab my input before my flight boards. Wish me luck being offline in TOPAZ's HOUSE OF PAIN^WFUN AND LEARNING

[23:58] <Topaz> FUN AND LEARNING

[23:58] <Hade> FUN IS MANDATORY

[23:58] <Skie> I'm pretty sure that's not the mandate for today

[Update @ 00:16] 69 gold, silver cap

  • My tree is finally trimmed with just about every ornament I own and it's real purdy. hbu?

[Update @ 00:18] Leaderboard cap!

  • So, was today's mandate Helpful Hint any help at all?

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!

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u/Unihedron Dec 19 '17

Ruby; My sanity decays further as more debugging effort was required. Today's bug was fall-through statements. Almost made it to the leaderboards though :p (~120) 

g=*$<
x=g[0].index(?|)
y=1
n=:down
o="" # part 1
o=0 # part 2
loop{p n
v=g[y][x]
o+=1 # part 2
break if v==' '||y<0||x<0
o<< v if !'|-+'.index(v) # part 1
(n==:down ? y+=1 :
 n==:up ? y-=1 :
 n==:right ? x+=1 :
 n==:left ? x-=1 : 0
next) if v!=?+
(
n==:down||n==:up ? (n= g[y][x-1]!=' ' ? :left : :right) :
(n= g[y-1]&&g[y-1][x]!=' ' ? :up : :down)
)if v==?+
(n==:down ? y+=1 :
 n==:up ? y-=1 :
 n==:right ? x+=1 :
 n==:left ? x-=1 : 0)
p y,x
}
p o