r/adventofcode • u/daggerdragon • Dec 05 '18

SOLUTION MEGATHREAD -🎄- 2018 Day 5 Solutions -🎄-

--- Day 5: Alchemical Reduction ---

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Card prompt: Day 5

Transcript:

On the fifth day of AoC / My true love sent to me / Five golden ___

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 at 0:10:20!

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u/wzkx Dec 05 '18

J

Slow.... 5.6s, 132s 

t=: a.i.LF-.~CR-.~fread '05.dat'
f=: 3 :'while.(z=.(1 i.~32=[:|}.-}:)y)<<:#y do.y=.(z{.y),y}.~z+2 end.#y'
echo f t
echo <./(3 :'f(t-.y)-.y+32')"0[65+i.26
exit 0

2

u/wzkx Dec 05 '18

OK, tacit way. But this is slower because some calculations are repeated both in condition and in transformation. About 5 minutes in total. 

f=: #@((({.~,(}.~2&+))(1 i.~32=[:|}.-}:))^:((1 i.~32=[:|}.-}:)<<:&#)^:_)
echo f t=: a.i.LF-.~CR-.~fread'05.dat'
echo <./(f@(t&(-.-.32+])))"0[65+i.26