12 lines
195 B
Ruby
12 lines
195 B
Ruby
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#!/usr/bin/env ruby
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problem = 3
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input = File.readlines("#{problem}.input").join
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result = input
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.scan(/mul\((\d{1,3}),(\d{1,3})\)/)
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.map { _1.map(&:to_i).inject(1, :*) }
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.sum
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puts result
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