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aalvarado/solution.rb

Created March 10, 2015 13:41
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PermMissingElem
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solution.rb
def solution(a)
((( a.size + 2 ) * ( a.size + 1 )) / 2) - ( a.reduce(&:+) || 0 )
end
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https://codility.com/demo/results/demo4PUYC8-HXU/

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