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Codility demo test (Ruby)
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| def equi(a) | |
| lower_elements_sum = 0 | |
| higher_elements_sum = a.inject(:+) | |
| a.each_with_index do |el, i| | |
| lower_elements_sum += a[i - 1] if i > 0 | |
| higher_elements_sum -= el | |
| return i if lower_elements_sum == higher_elements_sum | |
| end | |
| return -1 | |
| end | |
| describe "equi" do | |
| it "returns equilibrium index" do | |
| equi([-7, 1, 5, 2, -4, 3, 0]).should satisfy { |n| [3,6].include?(n) } | |
| equi([3, 2, 1, -6, 0]).should eql(4) | |
| equi([0, 3, 2, 1, -6]).should eql(0) | |
| end | |
| it "returns -1 if no equilibrium index exists" do | |
| equi([1, 2, 3, 4, 5, 6]).should eql(-1) | |
| end | |
| end |
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