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input = DATA.read
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.scan(/\d+/).map(&:to_i)
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.each_slice(2).to_a.transpose
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.map(&:sort)
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left, right = input
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# part one
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pp left.zip(right).sum { (_1 - _2).abs }
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# part two
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pp left.sum { _1 * right.count(_1) }
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__END__
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3 4
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4 3
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2 5
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1 3
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3 9
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3 3
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