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30 lines
820 B
30 lines
820 B
records = ARGF.read.chomp.lines.map(&:chomp).sort
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# puts records
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stats = Hash.new {|h,k| h[k] = [] }
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guard = nil
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fell_asleep_at = nil
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records.each do |record|
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if record =~ /\[\d{4}-\d{2}-\d{2} \d{2}:\d{2}\] Guard \#(\d+) begins shift/
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guard = $1.to_i
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elsif record =~ /\[\d{4}-\d{2}-\d{2} \d{2}:(\d{2})\] falls asleep/
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fell_asleep_at = $1.to_i
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elsif record =~ /\[\d{4}-\d{2}-\d{2} \d{2}:(\d{2})\] wakes up/
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stats[guard].concat((fell_asleep_at...$1.to_i).to_a)
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else
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p record
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end
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end
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stats.transform_values! {|v| v.group_by(&:itself).transform_values(&:count) }
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# Part One
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guard, minutes = stats.max_by {|_,v| v.values.sum }
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minute = minutes.max_by(&:last).first
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p guard * minute
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# Part Two
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guard, (minute, _) = stats.map {|k,v| [k, v.max_by(&:last)] }.max_by {|_,(_,v)| v }
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p guard * minute
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