-🎄- 2020 Day 1 Solutions -🎄-

136

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)

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

since 5 years, 1 month ago

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[–][deleted]5 points5 years, 1 month ago

In Crystal:

puts File.read_lines("input.txt")
  .map(&.to_i)
  .each_permutation(2)
  .find { |array| array.sum == 2020 }
  .not_nil!
  .product

For part 2 replace the 2 with a 3.