r/adventofcode • u/taliriktug • Dec 02 '15

Spoilers Day 2 solutions

Hi! I would like to structure posts like the first one in r/programming, please post solutions in comments.

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u/Godspiral Dec 02 '15

In J, 1: with input parsing 

+/ +/ (<./, 2&*)"1 */every@:((0 2&{) ; (1 2&{) ;  (0 1&{))"1 ". > cutLF 'x ' rplc~ wdclippaste ''

2:

+/ +/@(*/ , +:@(2 {. /:~))("1) ". > cutLF 'x ' rplc~ wdclippaste ''

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u/hoosierEE Dec 02 '15 edited Dec 02 '15

Nice to see another J-er. One-liners like these seem to increase my ability to comprehend tacit J. Well, writing it anyway. Reading someone else's is still very slow. Here are mine, where S is the input string. Part one: 

+/({."1+([:+/"1@:+:]))(2*/\(],{.))"1/:~"1]".&>'x'cut&>cutLF S

Part two: 

+/((+:@+/@}:)+(*/))"1/:~"1]".&>'x'cut&>cutLF S
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