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yuuki/euler4.rb

Created July 26, 2012 05:50
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euler4.rb
#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
r = (100 .. 999).to_a.map do |i|
(i .. 999).to_a.map do |j|
s = i * j
s.to_s == s.to_s.reverse ? s : nil
end.compact!.max
end.compact!.max
puts r
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