AdventOfCode-2020/day6.cr

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require "advent"
INPUT = input(2020, 6).split("\n\n")
def part1
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INPUT.sum &.chars.uniq!.count(&.ascii_letter?)
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end
def part2
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INPUT.sum &.lines.map(&.chars.to_set).intersect.size
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end
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puts part1
puts part2