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45 lines
613 B
45 lines
613 B
3 weeks ago
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rules, updates = DATA.read.split("\n\n")
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rules = rules.scan(/(\d+)\|(\d+)/).map { _1.map(&:to_i) }
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updates = updates.lines.map { _1.split(?,).map(&:to_i) }
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correct, incorrect = updates.partition {|pages|
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pages.each_cons(2).all? { rules.include?(_1) }
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}
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pp correct.sum { _1[_1.length/2] }
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pp incorrect.map {|pages|
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pages.sort {|a,b| rules.include?([a,b]) ? -1 : 1 }
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}.sum { _1[_1.length/2] }
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__END__
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47|53
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97|13
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97|61
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97|47
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75|29
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61|13
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75|53
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29|13
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97|29
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53|29
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61|53
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97|53
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61|29
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47|13
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75|47
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97|75
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47|61
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75|61
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47|29
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75|13
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53|13
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75,47,61,53,29
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97,61,53,29,13
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75,29,13
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75,97,47,61,53
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61,13,29
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97,13,75,29,47
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