25 lines
602 B
Ruby
25 lines
602 B
Ruby
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#!/usr/bin/env ruby
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# frozen_string_literal: true
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require 'pry'
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# ifile = 'input.sample'
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ifile = 'input'
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input = File.readlines(ifile).map(&:strip).reject(&:empty?)
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updates, rules = input.partition { _1.match?(',') }
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rules.map! { _1.split('|').map(&:to_i) }
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updates.map! { _1.split(',').map(&:to_i) }
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updates.select! do |update|
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update.combination(2).map do |pair|
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rule = rules.select { _1.include?(pair[0]) and _1.include?(pair[1]) }.flatten
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next if rule.empty?
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rule == pair
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end.all?
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end
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solution = updates.map { |update| update[update.size / 2] }.sum
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# binding.pry
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puts solution
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