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29 lines
630 B
Ruby
29 lines
630 B
Ruby
# @param {Integer[]} nums
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# @return {Integer}
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def max_sub_array(nums)
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if nums.empty? then
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return nil
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end
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sum, running_sum = nums.first, nums.first
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nums.drop(1).each { |x|
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running_sum = [running_sum + x, x].max
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sum = [sum, running_sum].max
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}
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return sum
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end
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RSpec.describe "max_sub_array of " do
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it "[-2,1,-3,4,-1,2,1,-5,4] is 6" do
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expect(max_sub_array([-2,1,-3,4,-1,2,1,-5,4])).to eq(6)
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end
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it "[1] is 1" do
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expect(max_sub_array([1])).to eq(1)
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end
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it "[5,4,-1,7,8] is 23" do
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expect(max_sub_array([5,4,-1,7,8])).to eq(23)
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end
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end
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