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14 lines
376 B
14 lines
376 B
priorities = ((?a..?z).to_a + (?A..?Z).to_a).map.with_index { [_1, _2+1] }.to_h
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# part 1
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# p ARGF.read.lines(chomp: true).map {|line|
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# len = line.length
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# a = line[0...len/2]
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# b = line[len/2..]
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# priorities.fetch((a.chars & b.chars)[0])
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# }.sum
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p ARGF.read.lines(chomp: true).each_slice(3).map {|chunk|
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priorities.fetch(chunk.map(&:chars).inject(&:&)[0])
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}.sum
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