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tenebrousedge/quads.rb

Created May 23, 2017 23:30
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HackerRank - Beautiful Quadruples
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quads.rb
#!/bin/ruby
A = gets.strip.split(' ').map(&:to_i)
Array.class_eval do
def valid?
(0..3).all? {|i| 1 <= self[i] && self[i] <= A[i] }
end
end
puts A.repeated_permutation(4).map(&:sort).uniq.select {|e| !(e.reduce(:^).zero?) && e.valid?}.length
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