38 lines
712 B
Crystal
38 lines
712 B
Crystal
require "advent"
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def letter_score(letter : Char)
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if letter.uppercase?
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letter.ord - 'A'.ord + 1 + 26
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else
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letter.ord - 'a'.ord + 1
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end
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end
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INPUT = input(2022, 3).lines
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def part1(input)
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input = input.map do |line|
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first = line[0, line.size//2]
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second = line[line.size//2, line.size//2]
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{first.chars.to_set, second.chars.to_set}
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end
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input.sum do |a,b|
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puts (a & b)
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(a & b).to_a.map do |l|
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puts letter_score(l)
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letter_score(l)
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end.sum
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end
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end
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def part2(input)
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input
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.map(&.chars.to_set)
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.in_groups_of(3, Set(Char).new)
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.map(&.reduce { |l,r| l & r }.sum { |l| letter_score l })
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.sum
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end
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puts part1(INPUT.clone)
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puts part2(INPUT.clone)
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