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#!/usr/bin/env ruby
data = File.read("data.txt")
data = data.split("\n")
data = data.map(&:split)
first_row = data.map { |data| data[0].to_i }
second_row = {}
data.map do |data|
value = data[1].to_i
count = second_row[value] ? second_row[value] + 1 : 1
second_row[value] = count
end
similiarity = first_row.map do |value|
multiplayer = second_row.fetch(value, 0)
value * multiplayer
end.sum
p similiarity
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