24 lines
499 B
Ruby
24 lines
499 B
Ruby
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#!/usr/bin/env ruby
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require_relative '../common'
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class Day03 < Day
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def self.priority(char)
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(("a".."z").to_a + ("A".."Z").to_a).index(char) + 1
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end
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def part1
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stdin.map(&:chars).map do |rucksack|
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self.class.priority((rucksack[0..(rucksack.size / 2) - 1] & rucksack[(rucksack.size / 2)..]).first)
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end.sum
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end
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def part2
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stdin.map(&:chars).each_slice(3).map do |group|
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self.class.priority group.inject { |res, g| res & g }.first
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end.sum
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end
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end
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Day03.run
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