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Yasushi/gist:257a7b78fdbabadabb4e

Created July 16, 2014 13:33
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gistfile1.rb
class Ex
def sum(l, s)
@c = (@c||0) + 1
(not l or l.empty?) ? s : sum(l[1..-1],s+l[0])
end
def count ; @c end
end
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