AdventOfCode-2022/day3.cr
2022-12-02 23:48:23 -08:00

38 lines
712 B
Crystal

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