18 lines
399 B
Ruby
18 lines
399 B
Ruby
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#!/bin/env ruby
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def valid_nums (nums)
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nums.map { |num| nums
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.map { |sub| sub + num if sub != num }}.flatten.uniq.compact
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end
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numbers = File.readlines('./input').to_ary.map(&:strip!).map(&:to_i)
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preamble = 25
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numbers.each.with_index do |number, i|
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next if i < preamble
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if !valid_nums(numbers[(i-preamble)..(i-1)]).include?(number)
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puts number
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break
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end
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end
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