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jcmorrow/day_15_part_1.ijs Secret

Last active December 27, 2020 02:05
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day_15_part_1.ijs
input =: 15 5 1 4 7 0
nth =: dyad define
last =. _1{y
allP =. _1}.y
prev =. allP i: last
if. prev = # allP do.
new =. allP,last,0
else.
new =. allP,last,((# allP) - prev)
end.
if. (#new) = x do.
new return.
else.
x nth new
end.
)
{. |. 2020 nth input
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