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December 5, 2017 18:29
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| puzzle = <<-EOF | |
| 5 1 9 5 | |
| 7 5 3 | |
| 2 4 6 8 | |
| EOF | |
| puzzle.lines.map { |l| l.split.map(&:to_i).minmax.inject(:-).abs }.inject(:+) |
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Part 2:
puzzle.lines.map { |l| l.split.map(&:to_i).permutation(2).to_a.select { |a, b| a % b == 0 }.map { |a, b| a / b } }.flatten.inject(:+)