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metallurgix/codility1-3.rb

Created December 9, 2014 11:35
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Codility-Lesson 1-Challenge 3
Raw
codility1-3.rb
def solution(a)
if a.length==0
1
else
sum=a.inject(:+)
((a.length+1)*(a.length+2)/2)-sum
end
end
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