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priorities = (?a..?z).chain(?A..?Z).each.with_index.to_h { [_1, _2+1] }
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input = ARGF.read.lines(chomp: true).map(&:chars)
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# part 1
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p input.sum { priorities.fetch(_1.each_slice(_1.length/2).inject(&:&)[0]) }
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# part 2
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p input.each_slice(3).sum { priorities.fetch(_1.inject(&:&)[0]) }
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