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SOLUTION MEGATHREAD-🎄- 2020 Day 1 Solutions -🎄-(self.adventofcode)

submitted 5 years, 1 month ago* (edited 3 hours, 3 minutes after) by daggerdragon to /r/adventofcode (134.8k)

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It's been one heck of a crappy year, so let's make the holidays bright with Advent of Code 2020! If ...

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[–][deleted]7 points5 years, 1 month ago

Golfed (05AB1E) 13 char

|2.ÆʒO2020Q}P

Explanation

-- implicit input --
| -> pushes the whole input as an array
2 -> push 2 on stack
.Æ -> a, b - b-element combinations of a
ʒ -> filter
    O -> sum
    2020 -> push 2020 on stack
    Q -> a,b - a equals b
} -> end filter
P -> Product
-- implicit output --

And then for part 2 just exchange the first 2 with a 3

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