88 lines
1.6 KiB
Ruby
88 lines
1.6 KiB
Ruby
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require 'pry'
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events = []
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guards = {}
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File.open("input", "r") do |f|
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f.each_line do |line|
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events.push ({
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date: line[/\d{4}-\d{2}-\d{2} \d{2}:\d{2}/],
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type: (line.end_with?("shift\n") ? :begins_shift : (line.end_with?("asleep\n") ? :falls_asleep : :wakes_up)),
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id: line[/#\d+/].to_s[1..-1].to_i
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})
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end
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end
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events.sort_by! do |event|
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event[:date]
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end
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current_guard = 0
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begin_minute = 0
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events.each do |event|
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if event[:type] == :begins_shift
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if guards[event[:id]].nil?
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guards[event[:id]] = Array.new(60){0}
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end
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current_guard = event[:id]
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elsif event[:type] == :falls_asleep
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begin_minute = event[:date][-2..-1].to_i
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else
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(event[:date][-2..-1].to_i - begin_minute).times do |minute|
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guards[current_guard][begin_minute + minute] += 1
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end
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end
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end
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# Strategy 1
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sleepiest_guard = 0
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longest_time = 0
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guards.each do |id, counts|
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time = counts.inject(:+)
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if time > longest_time
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longest_time = time
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sleepiest_guard = id
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end
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end
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sleepiest_minute = 0
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max_count = 0
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guards[sleepiest_guard].each_with_index do |count, index|
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if count > max_count
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max_count = count
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sleepiest_minute = index
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end
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end
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puts sleepiest_minute * sleepiest_guard
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# Strategy 2
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guard = 0
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minute = 0
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count = 0
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guards.each do |id, counts|
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max_count = 0
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max_index = 0
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counts.each_with_index do |count_, index|
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if count_ > max_count
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max_count = count_
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max_index = index
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end
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end
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if max_count > count
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guard = id
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minute = max_index
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count = max_count
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end
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end
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puts guard * minute
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