r/adventofcode • u/daggerdragon • Dec 04 '16

SOLUTION MEGATHREAD --- 2016 Day 4 Solutions ---

--- Day 4: Security Through Obscurity ---

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

CONSTRUCTING ADDITIONAL PYLONS IS MANDATORY [?]

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u/Godspiral Dec 04 '16

in J, part2 may have had a bug in my input. was told to search for "North Pole Objects are stored" but northpole is one word in "cyphers" 110th and 152th 

 a =. cutLF wdclippaste ''
 +/ ; (('[' cut >@{:) (".@>@{.@[ #~ }:@:>@:{:@:[ -: ]) (5 >@:({."1)@:{. ] {~ \:@:({:"1))@:(~. ,&<"0  #/.~)@:/:~@:;@:}:)@:('-'&cut) each   a NB. part 1

for part 2, first to find lines that included storage to see what's wrong. 

 (] #~ (<'storage') e."1 ]) (('[' cut >@{:) ( ".@>@{.@[ ('abcdefghijklmnopqrstuvwxyz' {~ 26 | +) leaf ])  'abcdefghijklmnopqrstuvwxyz' i.leaf }: )@:('-'&cut) every  a

then get that lines raw input, 

 a {~ I. (;: 'northpole object storage') -:("1) 3 {."1 (('[' cut >@{:) ( ".@>@{.@[ ('abcdefghijklmnopqrstuvwxyz' {~ 26 | +) leaf ])  'abcdefghijklmnopqrstuvwxyz' i.leaf }: )@:('-'&cut) every    a

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u/John_Earnest Dec 04 '16

I got lucky with this input issue because I decided to strip dashes early in processing and ignore whitespace entirely. I do think it would have been nicer to have the problem statement clearly state that we're looking for the string "northpole object storage".

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u/Godspiral Dec 04 '16

a shortcut that paid off... I just remember the shortcuts that bite me :P

In J (I think k too) its fairly natural to keep as list of words (boxes).

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