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