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jasper-lyons/reverse-catcha-1.rb

Created December 2, 2017 22:29
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reverse-catcha-1.rb
def reverse_captcha(captcha)
(captcha + captcha[0]). # "21752...7422"
split(''). # ['2', '1', '7', ... '4', '2']
each_cons(2). # [ ['2', '1'], ['1', '7'], ... ['4', '2'], ['2', '2'] ]
map { |a, b| a == b ? a.to_i : 0 }. # [0,0,0,0,0,...0,0,2]
reduce(&:+) # sum
end
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