AdventOfCode-2018/day2.cr

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2018-12-02 21:34:51 -08:00
require "./common.cr"
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lines = File.read("day2_input").split("\n")
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lines.pop
CHARS = ('a'..'z').to_a
def has_n?(string, n)
return string.chars.count_each(CHARS).any?(&.[](1).==(n))
end
def count_changes(s1, s2)
pairs = s1.chars.zip s2.chars
total = 0
pairs.each do |pair|
total += 1 if pair[0] != pair[1]
end
return total
end
two = lines.count { |s| has_n?(s, 2) }
three = lines.count { |s| has_n?(s, 3) }
puts "\"Hash\": #{two * three}"
lines.product(lines).each do |pair|
if count_changes(pair[0], pair[1]) == 1
puts "Strings: #{pair[0]}, #{pair[1]}"
exit
end
end