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atton/aoj_0008.rb

Last active December 15, 2015 05:49
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AOJ 0008
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aoj_0008.rb
# after 1.9.2
while n = gets.chomp
puts (0..9).to_a.repeated_permutation(4).to_a.map{|a| a.inject(:+)}.select{|b| b == n.to_i}.size
end
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