38 lines
852 B
Ruby
38 lines
852 B
Ruby
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#!/usr/bin/env ruby
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# frozen_string_literal: true
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# input = "xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))"
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input = File.read('./input')
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# Part 1
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solution = input.scan(/mul\(\d{1,3},\d{1,3}\)/).map do |instruction|
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instruction.scan(/\d{1,3},\d{1,3}/)
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end.flatten.map { |pair| pair.split(',').map(&:to_i) }.map { |x, y| x * y }.sum
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puts solution
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# Part 2
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instructions = input.scan(/(mul\(\d{1,3},\d{1,3}\))|(don't)|(do)/).flatten.compact
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delete = false
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instructions.map! do |instruction|
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case instruction
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when 'don\'t'
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delete = true
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nil
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when 'do'
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delete = false
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nil
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else
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if delete
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nil
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else
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instruction.scan(/\d{1,3},\d{1,3}/).flatten.map { |pair| pair.split(',').map(&:to_i) }.map { |x, y| x * y }
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end
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end
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end
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solution = instructions.flatten.compact.sum
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puts solution
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